Norwegian Wood by The Beatles: Song Analysis

The song opens with a sweepingly catchy acoustic melody that seamlessly evokes sense of nostalgic longing. This feeling of sadness and reflection permeates throughout the piece. While the arrangement is actually quite complex, the music appears stripped down to the casual listener; the song is centered around a mall lick performed simultaneously on acoustic guitar and sitar, which Is Introduced at the beginning and decidedly does not evolve into anything beyond this. The simplistic structure brings to mind a sensation of loneliness, which is heightened by Lemon's yearning vocals.The soothing melody can be described as dreamlike, and the petition is used to almost hypnotic effect, succeeding in ministering the concentrated listener into a peaceful, contemplative daze. The short length of the song Is somewhat Jarring (It ends just after two minutes) because Just as the listener has been subdued by the Infectious melody, they are abandoned by It just as quickly. It feels as though there should be more; as if there is something missing. I would argue, however, that this is exactly the effect The Battles intended, as it adds to the ambiguous nature of the song. The production of the song, courtesy of GeorgeMartin, succeeds in bringing the contagious melody to the forefront of the experience, all the while allowing the rest of the Instruments sufficient clarity. Ambiguity Is also achieved through the song's lyrics, which describe a seemingly clandestine love affair between Lennox and an unnamed woman. The song opens with the line: â€Å"I once had a girl, or should I say, she once had me†, suggesting that not only is the relationship mysterious to the listener, but also inconclusive to the man involved in it. The lyrics continue to outline a strained evening of the couple talking, ranking wine, and eventually going to bed in separate rooms.Much speculation has been made as to what the song Is actually about, especially the final lines; â€Å"And when I awoke, I was alone, this bird had flown / So 1 11th a fire, Isn't It good, Norwegian wood. † Some believe that the fire being lit is a joint of marijuana, or that the man burns the house down after the woman makes him sleep in the bath. In The Battles Anthology, Lennox says of the lyrics: ‘Norwegian Wood' was about an affair I was having. I was very careful and paranoid because I didn't want my wife, CCNY, to know that there really was something owing on outside the household.I'd always had some kind of affairs going, so I was trying to De sophisticated In writing auto an tall, out In sun a smokescreen way that you couldn't tell. (196) Like many of The Battles' innovations in sound, the incorporation of the sitar came from spontaneous experimentation. In The Battles Anthology, George Harrison recalls: I went and bought a sitar from a little shop at the top of Oxford Street called Antiaircraft – it stocked little carvings, and incense. It was a real crummy-quality one, a ctually, but I bought it and mucked around with it a bit.Anyway;ay, we were at the mint where we'd recorded the ‘Norwegian Wood' backing track (twelve-string and six- string acoustic, bass and drums) and it needed something. We would usually start looking through the cupboard to see if we could come up with something, a new sound, and I picked the sitar up – it was Just lying around; I hadn't really figured out what to do with it. It was quite spontaneous: I found the notes that played the lick. It fitted and it worked. (196) â€Å"Norwegian Wood† is the second track on Rubber Soul, following the upbeat â€Å"Drive My Car† and is followed by the also light-hearted muff Won't See Me†.

Ap Us History Essay

There are many stereotypes that pertain to black people. One that really stands out is â€Å"If you want to hide something from a black person hide it in a book† which the white man is trying to call us African Americans illiterate. Which is ignorant is so many type of ways. But yet we do nothing more to make that statement false by not being educated, well organized and full of wisdom. Years ago, when slavery was in its actions African Americans where always thought of as less. White people came up with the assumption that black people where only good for three things; sex which they’d rape most of the women, singing, because they made them perform as entertainment, and sports because African Americans were always â€Å"active†. Which shows you that African Americans were nothing more than than serfs (which is another word for someone working labor on it’s owners estate). African American had no real opportunity of living. Reading was against the law for African Americans. They weren’t able to read or to even learn how to read, because the white men didn’t want the slaves to go against or better yet become stronger than them. Fredrick Douglas said â€Å"Knowledge makes a man unfit to be a slave. â€Å", and the white men knew that. So they stayed uneducated. Which gave the white men even a better reason to think they could take over our brains. From this point on was the way for the whites to start lowering expectations of black people. As of today, African Americans are still looked down on and still are given some of the stereotypes from slavery now. Are generation and before make it no better. With the lack of education, attitude and everything else that’s makes up our community in a negative way. The black on black crimes and violence doesn’t make it even better. It’s basically giving the white men exactly what he set out to happen. The gang violence and fighting just puts the icing on the cake for everything. We are basically confirming what the white me. Is saying because we are not taking any time to read into and make a change. Make it better for no one but ourselves. These assumptions are untrue and the only way we can show that we are the opposite of these stereotype are by making a change starting small and ending big. Ignorance has existed for decades. It not that we can’t do anything about it. But it’s something that’s never going to go away. But one thing we can’t do us loss out sense and pride for our race and culture. William Wilberforce once said â€Å"You may choose to look the other way but you can never say again that you did not know. † Which basically means, yes you may feel what information you may have been given is something you don’t want to hear, but in reality it’s the truth and you’ll need it in the long run. It will define who you are a person if you take the information you get and go and expand it and take it a long way. To finish up, you have to realize education is the key to a better tomorrow. Now matter how many out down and downfalls you come across just know that’s there will always be brighter days. As an African American young lady i know I have to work ten times as harder knowing the roots of how females where looked at. As long as we have life and breath, we have an opportunity to change.

Bangus Production

FISHPOND ENGINEERING 1. INTRODUCTION Fishpond Engineering is the science of planning, designing and constructing ponds including water control structures. Although not entirely new in the Fish Farm industry, it has gained international acceptance and plays an important role for the efficiency of the farm management as well as in attaining higher farm production. Fishpond Engineering takes into consideration most especially the physical structures and economy of construction based on the proper engineering procedure and application. . SITE SELECTION AND EVALUATION OF EXISTING AREAS 2. 1 Water Supply Water supply is the first and most important factor to consider in the suitability of a fishpond site. Usually, water supply comes from a river, a creek or from the sea. It must meet the quality and quantity requirement of the pond system throughout the year. Water quality is affected by the physical, the chemical, and the biological parameters. Such parameters are affected by the 1) by-products and wastes resulting from urbanization, 2) agricultural pollutants such as pesticides and fertilizers, 3) industrial wastes from pulp mills, sugar, oil refineries, and textile plants, 4) radio-active wastes, 5) oil pollution arising navigational activities, uncontrolled spillage, and oil exploration. Some of these parameters are discussed in detail under fishpond management. Poor quality water sometimes causes the fouling of gates, screens or metal pipes. This happens when heavy dredging is being conducted in an area. Heavy dredging increases turbidity and causes the release of organic substances embedded in the soil. Once these organic substances are released, they use up oxygen causing high biological oxygen demand (BOD). Higher BOD causes oxygen depletion which in turn makes the water foul. Similar conditions also occur during floods. Water supply in tide-fed farms must be adequate especially during some months of the year when the height of high water is at minimum. This problem can be solved by proper gate design and by the use of pumps. The rate of volume flow of nearby tidal stream needs also to be considered; measurement is made during the dry stream flow and during floods. The data obtained give the developer the minimum and maximum rates of discharge. These are important requirements in fish farm design. For details, refer to Annex I. 2. 2 Tidal Characteristic and Ground Elevation The suitability of a tide-fed area for a â€Å"bangus† fishpond project depends on the relationship between the tidal characteristic of the area and its ground elevation. The only free source of energy that could be tapped for flooding a brackishwater coastal pond is tidal energy which is available once or twice a day depending on geographical location. Five reference stations in the Philippines exhibit five peculiarly different patterns during some months of the year. Figure 1 shows in a graphical form the relationship of natural ground elevation to tidal characteristic. Tables 1 and 2 show such relationships as they are applicable to the six stations of reference. [pic] Figure 1 – Suitability of Proposed Fishpond Site Based on Tidal Characteristic and Ground Elevation. |LOCALITY |Elevations in Meters Above Mean Lower Low H20 | | |Mean High Water (MHW) |Mean Sea Level (MSL) |Mean Low Water (MLW) | |Pier 13, South Harbor, Manila |0. 872 |0. 479 |0. 104 | |Pier 2, Cebu City |1. 50 |0. 722 |0. 183 | |Legaspi Port, Legaspi City |1. 329 |0. 744 |0. 165 | |Sta. Ana Port Davao City |1. 405 |0. 753 |0. 101 | |Port of Poro, San Fernando, La Union |- |0. 372 |- | |Jolo Wharf Jolo, Sulu |0. 631 |0. 38 |0. 034 | Table 1. List of Primary Tide Stations and Datum Planes |   |Highest |Lowest |Absolute |Normal daily fluctuation |R E M A R K S | | |recorded tide |recorded tide|annual range |low/high(range) (m) | | | |(m) |(m) |(m) | | | |PHILIPPINES |1. 4 |(-)0. 21 |1. 25 |(-)0. 03/0. 61(0. 64) |Tidal fluctuation too | |San Fernando, La | | | | |narrow for proper | |Union | | | | |fishpond management | |Manila City |1. 46 |(-)0. 34 |1. 8 |0. 14/1. 05(0. 1) |T idal fluctuation | | | | | | |slightly narrow for | | | | | | |proper fishpond | | | | | | |management | |Legaspi City |1. 83 |(-)0. 4 |2. 23 |1. 09/1. 40(1. 9) |Tidal fluctuation | | | | | | |favorable for proper | | | | | | |fishpond management | |Cebu City |1. 98 |(-)0. 4 |2. 38 |(-)0. 03/1. 49(1. 52) |-do- | |Davao City |1. 98 |(-)0. 49 |2. 47 |(-)0. 03/1. 77(1. 80) |-do- | |Jolo, Sulu |1. 19 |(-)0. 12 |1. 31 |(-)0. 03/0. 98(1. 1) |Tidal fluctuation | | | | | | |slightly narrow for | | | | | | |proper fishpond | | | | | | |management | Table 2. Suitability of Six Tidal Stations of Reference for Fish Farms Areas reached only by the high spring tides should be ruled out as it is costly to move large quantities of soil during the process of excavation. There is that other problem of where to place the excess materials. While these can be solved by constructing high and wide perimeter dikes, putting up more dikes will create narrow compartments resulting in less area intended for fish production. Low areas on the other hand will require higher and more formidable dikes which may mean that earth will have to be moved long distances. The pond bottom should not be so low that drainage will be a problem. The best elevation for a pond bottom therefore, would at least be 0. 2 meter from the datum plane or at an elevation where you can maintain at least 0. meter depth of water inside a pond during ordinary tides. This index should satisfy the requirements of both fish and natural fish food. 2. 2. 1 Tides The attractive forces of both the moon and the sun on the earth surface which changes according to the position of the two planets bring about the occurrence of tides. Tides recur with great regularity and uniformity, although tidal charac teristic vary in different areas all over the world. The principal variations are in the frequency of fluctuation and in the time and height of high and low waters. When the sun, the moon and the earth are in a straight line, greater tidal amplitudes are produced. These are called spring tides. Tides of smaller amplitudes are produced when the sun and the moon form the extremes of a right triangle with the earth at the apex. These are called neap tides. When high and low waters occur twice a day it is called a semi-diurnal tide. When the high and the low occur once a day it is called a diurnal tide. The moon passes through a given meridian at a mean interval of 24 hours and 50 minutes. We call this interval one lunar day. Observations reveal that the mean interval between two successive high (or low) waters is 12 hours and 25 minutes. Thus, if there is a high water at 11:00 A. M. today, the next high water will take place 12 hours and 25 minutes later, i. e. , 11:25 P. M. and the next will be at 11:50 A. M. of the following day. Each day the time of tide changes an average of 50 minutes. The difference in the sea water level between successive high and low waters is called the range. Generally, the range becomes maximum during the new and full moon and minimum during the first and last quarter of the moon. The difference in the height between the mean higher high and the mean lower low waters is called the diurnal range. The difference in the tide intervals observed in the morning and afternoon is called diurnal inequality. At Jolo, for instance, the inequality is mainly in the high waters while at Cebu and Manila it is in the low waters as well as in the high waters. The average height of all the lower of low waters is the mean lower low (MLLW), or (0. 00) elevations. This is the datum plane of reference for land elevation of fish farms. Prediction of tides for several places throughout the Philippines can be obtained from Tide and Current Tables published annually by the Bureau of Coast and Geodetic Survey (BCGS). These tables give the time and height of high and low water. The actual tidal fluctuation on the farm however, deviates to some extent from that obtained from the table. The deviation is corrected by observing the time and height of tidal fluctuation at the river adjacent to the farm, and from this, the ratio of the tidal range can be computed. From the corrected data obtained, bench marks scattered in strategic places can be established. These bench marks will serve later on as starting point in determining elevations of a particular area. 2. 2. 2 Tide prediction There are six tide stations in the Philippines, namely: San Fernando, Manila, Legaspi, Cebu, Jolo and Davao stations. Reference stations for other places are listed under the â€Å"Tidal Differences† and â€Å"Constants† of the Tide and Current Tables. The predicted time and height of high and low waters each day for the six tide stations can be read directly from the table. Tide predictions for other places are obtained by applying tidal differences and ratios to the daily predictions. Tidal differences and ratios are also found in the Tide and Current Tables. Let us take for example, the tidal predictions for Iloilo on 23 Sept. 1979. Looking through the tidal differences and constants of the Tide Tables, you will find that reference station for Iloilo is Cebu. The predicted time and height of tides for Cebu obtained from the tide tables on 23 Sept. 1979 are as follows: |High |Low            | |Time |: |Height |Time |: |Height | |0004 |: |1. 3 m |0606 |: |0. 14 m | |1216 |   |1. 52 m |1822 |   |0. 18 m | (The heights are in meters and reckoned from mean lower low water (MLLW); 0000 is midnight and 1200 is noon). Again, from the table on Tidal Differences and Constants, the corrections on the time and height of high and low waters for Iloilo are as follows: |Time |Height of High Water |Height of Low Water | |+ 0 hr. 05 min. |+ 0. 09 |+ 0. 3 | Thus, the corrected time and heights of high and low waters for Iloilo are: |High |Low            | |Tim e |: |Height |Time |: |Height | |0009 |: |1. 52 m |0611 |: |0. 17 m | |1221 |: |1. 61 m |1827 |: |0. 21 m | 2. 2. 3 Height of tide at any given time The height of the tide at any given time of the day may be determined graphically by plotting the tide curve. This can be done if one needs to know the height of the tide at a certain time. The procedure is as follows: On a cross-section paper, plot the high (H) and the low (L) water points between which the given time lines (see Fig. 2). Join H and L by a straight line and divide it into four equal parts. Name the points as Q1, M and Q2 with M as the center point. Locate point P1 vertically above Q1 and P2 vertically below Q2 at a distance equal to one tenth of the range of the tide. Draw a sine curve through points H, P1, M, P2 and L. This curve closely approximates the actual tide curve, and heights for any time may be readily scaled from it. Figure 2 shows the curve on 23 Sept. 1979 for Iloilo. H is 1. 61 m at 12:21 hr and L is 0. 21 m at 18:27 hr. Since the range is 1. 40 m, P1 is located 0. 14 units above Q1 and P2 is located 0. 14 units below Q2. The height of the tide at 14:30 hr is given by point T to be 1. 22 m. [pic] Figure 2. Height of Tide at any Given Time for Iloilo on 23 Sept. 1979. 2. 3 Soil Properties Most of our fishponds are constructed on tidal lands consisting of alluvial soils which are adjacent to rivers or creeks near the coastal shores and estuaries at or near sea level elevation. If you pick up a handful of soil and examine it closely, you will find that it is made up of mineral and organic particles of varying sizes. The mineral particles are the clay, silt, and sand while the organic particles are plant and animal matter at various stages of decomposition. Soils are assigned with textural classes depending on their relative proportion of sand, silt and clay. Each textural class exhibits varying colors which are based on their chemical composition, amount of organic matter and the degree of decomposition. U. S. Department of Agriculture Classification System has classified soil as: |GENERAL TERMS | |Common Names |Texture |Basic Soil Textural Class Names | |1. |Sandy Soils |Coarse |Sandy | | | | |Sandy Loam | |2. Loamy Soils |Moderately Coarse |Sandy Loam | | | | |Fine sandy Loam | | | |Medium |Very fine Sandy Loam | | | |Moderately fine |Loam | | | | |Silty Loam | | | | |Silt | |3. |Clayey Soils |Fine |Sandy Clay |Clay Loam | | | | |Silty Clay |Sandy Clay Loam | | | | |Clay |Silty Clay Loam | Many properties of soil, which are related to its texture, determine how well suited it is for fishpond purposes. A sandy loam, for instance, is more porous than silty loam and the latter will hold more nutrients than the former. Clay or sandy clay may be the best for dike construction but not as good as clay loam or silty clay loam in terms of growing natural food. So, in general, finer textured soils are superior for fishpond purposes because of their good water retention properties. Each soil texture exhibits different workability as soil construction material. Studies conducted show that clayey soil is preferred for diking purposes. Suitability of a soil class as dike material decreases with decreasing percentage of clay present in the mixture (see Table 3). CLASS |RELATIVE CHARACTERISTIC |COMPACTION CHARACTERISTIC |SUITABILITY FOR DIKE | | | | |MATERIAL | | |PERMEABILITY |COMPRESSIBILITY | | | |Clay |impervious |medium |fair to good |excellent | |Sandy clay |impervious |low |good |good | |Loamy |semi-pervious |high |fair to very |fair | | |to | | | | | |impervious |high |poor | | |Silty |se mi-pervious to |medium to |good to very |poor | | |impervious |high |poor | | |Sandy |pervious |negligible |good |poor | |Peaty |- |- |- |very poor | Table 3. Relationship of Soil Classes and Suitability for dike material Sediments are a dominant and observable characteristic in lower areas of brackishwater swamplands. Field observations and laboratory analysis of soil samples taken reveal that the majority have a thick layer of loose organic sediments which make them unsuitable for fishpond development and other infrastructures. Engineering and other technical considerations indicate that areas having this type of soil are rather difficult to develop because it is directly related to future land development problems such as (1) subsidence and related flood hazards, (2) unavailability of stable and indigenous soil materials for diking, and (3) unavailability of land with adequate load bearing capacity for future infrastructures such as buildings for storage and production facilities. Areas dominated by organic and undecomposed sediments are expected to experience considerable subsidence which eventually result to loss in effective elevation of the land after development as a result of drainage or controlled water table. Since elevation of most tidal lands converted to brackishwater fishponds are generally one meter above MLLW, any future loss of elevation due to subsidence shall predispose the area to severe drainage and flooding problems due to blocking effect of seawater during high tides. Organic and undecomposed sediments are not a good foundation for dikes nor for diking material. Fishpond areas dominated by this type of soil will mean that there is an inadequacy of indigenous soil materials for diking or filling of lower areas. In the absence of good soil materials, the site under consideration will require importing of soils from the adjoining areas which will make the system of development a very expensive process, or considerable excavation for diking will cause (1) unnecessary exposure of acid organic layers, (2) difficulty in leveling, (3) high cost of dike maintenance and (4) technical problems on seepage losses which will cause difficulty in maintaining water levels in the pond. 2. 3. 1 Field method for identification of soil texture Sand – Soil has granular appearance. It is free-flowing when in a dry state. A handful of air-dry soil when pressed will fall apart when released. It will form a ball which will crumble when lightly touched. It cannot be ribboned between thumb and finger when moist. Sandy Loam – Essentially a granular soil with sufficient silt and clay to make it somewhat coherent. Sand characteristic predominate. It forms a ball which readily falls apart when lightly touch ed when air-dry. It forms a ball which bears careful handling without breaking. It cannot be ribboned. Loam – A uniform mixture of sand, silt, and clay. Grading of sand fraction is quite uniform from coarse to fine. It is soft and has somewhat gritty feel, yet is fairly smooth and slightly plastic. When squeezed in hand and pressure is released, it will form a ball which can be handled freely without breaking. It cannot be ribboned between thumb and finger when moist. Silty Loam – It contains a moderate amount of finer grades of sand and only a small amount of clay; over half of the particles are silt. When dry, it may appear quite cloddy; it can be readily broken and pulverized to a powder. When air-dry, it forms a ball which can be freely handled. When wet, soil runs together and puddles. It will not ribbon but has a broken appearance; it feels smooth and may be slightly plastic. Silt – It contains over 80% of silt particles with very little fine sand and clay. When dry, it may be cloddy; it is readily pulverized to powder with a soft flour-like feel. When air-dry, it forms a ball which can be handled without breaking. When moist, it forms a cast which can freely be handled. When wet, it readily puddles. It has a tendency to ribbon with a broken appearance; it feels smooth. Clay Loam – Fine texture soils break into lumps when dry. It contains more clay than silt loam. It resembles clay in a dry condition. Identification is made on physical behaviour of moist soil. When air-dry, it forms a ball which can be freely handled without breaking. It can be worked into a dense mass. It forms a thin ribbon which readily breaks. Clay – Fine texture soils break into very hard lumps when dry. It is difficult to pulverize into a soft flour-like powder when dry. Identification is based on cohesive properties of the moist soil. When air-dry, it forms long thin flexible ribbons. It can be worked into a dense compact mass. It has considerable plasticity, and can be moulded. Organic Soil – Identification is based on its high organic content. Much consists of thoroughly decomposed organic materials with considerable amount of mineral soil finely divided with some fibrous remains. When considerable fibrous material is present, it may be classified as peat. Soil color ranges from brown to black. It has high shrinkage upon drying. 2. 4 Studies of Watershed and Flood Hazard 2. 4. 1 Watershed A watershed is a ridge of high land draining into a river, river system or body of water. It is the region facing or sloping towards the lower lands and is the source of run-off water. The bigger the area of the watershed, the greater the volume of run-off water that will drain to the rivers, creeks, swamps, lakes or ocean. Precipitation from a watershed does not totally drain down as run-off water. A portion of the total rainfall moving down the watershed's surface is used by the vegetation and becomes a part of the deep ground water supply or seeps slowly to a stream and to the sea. The factor affecting the run-off may be divided into factors associated with the watershed. Precipitation factors include rainfall duration, intensity and distribution of rainfall in the area. Watershed factors affecting run-off include size and shape of watershed, retention of the watershed, topography and geology of the watershed. The volume of run-off from a watershed may be expressed as the average depth of water that would cover the entire watershed. The depth is usually expressed in centimeters. One day or 24-hours rainfall depth is used for estimating peak discharge rate, thus: Volume of Flood Run-off (Q) [pic]+ S1 Engineering Field Manual For Conservation Practices, 1969, pp 2–5 to 2–6 |where |Q |= |accumulated volume of run-off in centimeters depth over the drainage area | | |P |= |accumulated rainfall in cm depth over the drainage area | | |Ia |= |initial obstruction including surface storage, interception by vegetation and | | | | |infiltration prior to run-off in cm depth over the drainage area | | |s |= |potential maximum retention of water by the soil equivalent in cm depth over the | | | | |drainage area | 2. 4. 2 Flood hazard Floods are common in the Philippines due to overflowing of rivers triggered by typhoons and the southwest monsoon rain prevailing over the islands during the rainy season. Overflow of the rivers is largely attributable to the bad channel characteristic such as steep slopes as well as meandering at the lower reach of the river. The network of the tidal streams in some delta areas has been rendered ineffective in conveying the flood-water to the sea due to fishpond construction. Flooding is common in this country and is considered the most destructive enemy of the fishpond industry. The floods of 1972 and 1974 greatly affected the fishpond industry in Central Luzon causing damage amounting to millions of pesos. Because of the floods, fishponds became idle during the time necessary for operators to make repairs and improvements. Floods cannot be controlled, but what is important is to know how a fishpond can be free to some extent from flood hazard. In order to prevent frequent flooding, it is necessary to know the weather conditions in the area where the fishpond project is located. The highest flood occuring in an area can be determined by proper gathering of information. In big rivers, the Ministry of Public Works (MPW) records the height of flood waters during rainy seasons. However, in areas where the MPW has no record, the best way is by gathering information from the people who have stayed in the area for many years. The size of the creek, river and drainage canal should also be determined to find out whether it can accommodate the run-off water or flood water that drains in the area once the fishpond project is developed. Records of the highest flood in the site, especially during high tide, is very important. It will be the basis in providing allowance for the drainage of flood water coming from the watershed. 2. 5 Climatic Conditions Climate has been described in terms of distribution of rainfall recorded in a locality during the different months of the year. In the Philippines, it is classified into four climatic zones preferably called weather types, namely: |Type I |- |Two pronounced seasons; dry from November to April and wet uring the rest of the year. | |Type II |- |No dry season with very pronounced maximum rainfall from November to January. | |Type III |- |Season not very pronounced; relatively dry from November to April and wet during the | | | |rest of the year. | |Type IV |- |Rainfa ll more or less evenly distributed throughout the year. | The elements that make up the climate of a region are the same as those that make up the weather, the distinction being one mainly of time. But the elements that concern most fishpond operators are the rainfall, temperature and the prevailing wind direction because they greatly affect fish production directly or indirectly. Data on rainfall and wind direction are very necessary in planning the layout and design of pond system. Knowing past rainfall records, you can more or less decide whether it will be necessary to include a drainage canal in the layout, and how large it will be when constructed. Knowing past rainfall records will also be necessary in computing the height of the secondary and tertiary dikes. Wind on the other hand, plays a role in fishpond design. Strong wind generates wave actions that destroy sides of the dike. This causes great expense in the construction and maintenance. However, this problem can be minimized with proper planning and design. For instance, longer pond dimension should be positioned somewhat parallel to the direction of the prevailing wind (see Fig. 3). This will lessen the side length of the dike exposed to wave action. This orientation of pond compartments will also have some advantageous effects in the management aspect. [pic] Figure 3. Layout of Pond Compartments Oriented to the Prevailing Wind Direction Nearly every location is subject to what is called the prevailing wind, or the wind blowing in one direction for a major portion of the year. Monsoons are prevailing winds which are seasonal, blowing from one direction over part of the year and from the opposite direction over the remaining part of the year. Trade winds, which generally come from the east, prevail during the rest of the year when the monsoons are weak. [pic] Figure 4. Wind Directions Wave action in ponds is caused by wind blowing across the surface. One cannot totally control wave action in ponds although it can be minimized. In typhoon belt areas or in areas where a strong wind blows predominantly, it is better to include wind breakers in planning the layout of ponds. 2. 6 Type and Density of Vegetation Mangrove swamps occur in abundance on tidal zones along the coasts of the Philippines which are being converted into fishponds for fish production, but not all mangrove swamps are suitable for fishpond purposes. Some are elevated and are not economically feasible for development; others have too low an elevation to develop. The distribution of mangrove species in tropical estuaries depend primarily on the land elevation, soil types, water salinity and current. It has been observed that â€Å"api-api† and â€Å"pagat-pat† trees (Avicennia) abound in elevated areas while â€Å"bakawan† trees (Rhizophora) are mostly found in low areas. It has also been observed that nipa and high tannin trees have a long-lasting low pH effect on newly constructed ponds. Presence of certain shrubs and ferns indicate the elevation and frequency of tide water overrunning the area. Certain aquatic plants such as water lily, eel grass and chara sp. indicate low water salinities. The type and density of vegetation, the size, wood density and root system of individual trees greatly affect the method of clearing, procedure of farm development and construction cost. Thickly vegetated areas, for instance, will take a long time to clear of stumps. Density of vegetation is classified according to kind, size and quantity per unit area. This is done to determine the cost of land clearing and uprooting of stumps. One method used is by random sampling. The process requires at least five or more samples taken at random, regardless of size, and vegetation is classified according to kind, size and number. Then the findings are tabulated and the average of the samples is determined. However, vegetation of less than 3 cm in diameter is not included. The total vegetation of the area is determined as follows: [pic] |Station |NIPA |BAKAWAN |API-API |LIPATA |BIRIBID | |(20? 20) | | | | | | | |No|Av|No. | | |. |e. | | | | |Si| | | | |ze| | | |b |= |line GD | | |h |= |height or distance | The total area of the irregular figure is equal to the sum of A1, A2, A3, A4 and A5. Example: Find the area of an irregular figure shown in Figure 13 using the triangulation method. Solution: [pic] [pic] b. Trapezoidal Rule [pic] Figure 14. Area Determination Using the Trapezoidal Rule If a field is bounded on one side by a straight line and on the other by a curved boundary, the area may be computed by the use of the trapezoidal rule. Along a straight line AB, Fig. 14, perpendicular offsets are drawn and measured at regular intervals. The area is then computed using the following formula: [pic] Where: |ho, hn |= |length of end offsets | |Sh |= |sum of offsets (except end offsets) | |d |= |distance between offsets | Example: In Fig. 4, if the offsets from a straight line AB to the curved boundary DC are 35, 25, 30, 40, and 10, and are at equal distance of 30, what is the included area between the curved boundary and the straight line? Solution: |Area ABCD |= |[pic] | | |= | | | |= |117. 5 ? 30 | | |= |3,525 sq. m. | 3. 2. 3 Laying out right angles and parallel lin es a. Laying out right angles. For instance it is required to lay out the center line of dike B (see Fig. 15) perpendicular to that of dike A using a tape. A simple corollary on the right triangle states that a triangle whose sides are in proportion of 3, 4, and 5 is a right triangle, the longest side being the hypotenuse. In the figure, point C is the intersection of the two dike centerlines. One man holds the zero end of the tape at C and 30 m is measured towards B. Again from C, measure 40 m distance towards A and then from A' measure a distance of 50 meters towards B'. Line CB' should intersect line A' B'. Therefore, line CB is formed perpendicular to line CA. It is always desirable to check the distances to be sure that no mistake has been made. [pic] Figure 15. Laying Out Right Angles b. Laying out parallel lines. In Figure 16, CD is to be run parallel to AB. From line AB erect perpendicular lines EF and GH in the same manner described in the previous discussion. Measure equal distances of EF and GH from line AB and the line formed through points C' and D' is the required parallel. [pic] Figure 16. Laying Out Parallel Lines 3. 3 Topographic Survey 3. 3. 1 Explanation of common terms a. Bench Mark (BM). A bench mark is a point of known elevation of a permanent nature. A bench mark may be established on wooden stakes set near a construction project or by nails driven on trees or stumps of trees. Nails set on trees should be near the ground line where they will remain on the stump if the tree will be cut and removed. Procedure on setting up a bench mark is attached as Annex 4. It is a good idea to mark the nail with paint and ring the tree above and below also in case a chain saw is used to cut down the tree. The Philippines Bureau of Coast and Geodetic Survey has established bench marks in nearly all cities and at scattered points. They are generally bronze caps securely set on stones or in concrete with elevations referenced to mean sea level (MSL). The purpose of these bench marks is to provide control points for topographic mapping. b. Turning Point (TP). A turning point is a point where the elevation is determined for the purpose of traverse, but which is no longer needed after necessary readings have been taken. A turning point should be located on a firm object whose elevation will not change during the process of moving the instrument set up. A small stone, fence post, temporary stake driven into the ground is good enough for this purpose. c. Backsight (BS). Backsight is a rod reading taken on a point of known elevation. It is the first reading taken on a bench mark or turning point immediately after the initial or new set-up. d. Foresight (FS). Foresight is a rod reading taken on any point on which an elevation is to be determined. Only one backsight is taken during each set-up; all other rod readings are foresights. e. Height of Instrument (HI). Height of instrument is the elevation of the line of sight above the reference datum plane (MLLW). It is determined by adding the backsight rod reading to the known elevation of the point on which the backsight was taken. 3. 3. 2 Transit-stadia method of topographic survey The following describes the procedure of determining ground elevations using the engineer's level with a horizontal circle and stadia rod. A transit may be substituted for the level if care is exercised in leveling the telescope. It is assumed that a bench mark with known elevation has been established. a. Establish your position from a point of known location on the map. In Figure 17, point B is â€Å"tied† to a point of known location on the map, such as corner monument C of the area. This is done by sighting the instrument at C and noting down the azimuth and distance of line BC. The distance of B from C is determined by the stadia-method discussed under area survey. [pic] Figure 17. Establishing Position from a Point of Known Location on the Map b. Take a rod reading on the nearest bench mark (BM), as shown in Figure 18, previously installed for such purpose. This reading is called the backsight (BS), the rod being on a point of known elevation. The height of the instrument (HI) is then found by adding the elevation of the bench mark (Elev. ) and backsight (BS), thus: H. I. = Elev. + B. S. [pic] Figure 18. Transit-stadia Method of Topographic Survey c. The telescope is sighted to point D, or any other points desired, and take the rod reading. The reading is called the foresight (F. S. ), the rod being on a point of known elevation. Ground elevation of point D is then determined by subtracting the foresight (F. S. ), from the height of the instrument (H. I. ), thus: Elevation = H. I. – F. S. d. Similar procedure is used in determining the ground elevation of several points which are within sight from the instrument at point B. The azimuth and distance of all the points sighted from point B are read and recorded in the sample field notes such as shown in Figure 19. |Sta. |Sta. |B. S. | |Occ. |Obs. | |HAT |= |Highest Astronomical Tide | |GS |= |Elevation of the ground Surface | |MF |= |Maximum Flood level | |FB |= |Allowance for Free Board | |%S |= |Percent Shrinkage and settlement | 1. The design height of a secondary dike is calculated using the following formula: [pic] Where: Hs |= |Height of the secondary dike | |HST |= |Highest Spring Tide | |GS |= |Elevation of the ground Surface | |MR |= |Maximum Rainfall within 24 hours | |FB |= |Allowance for Freeboard | |%S |= |Percent Shrinkage and settlement | 2. The design height of a tertiary dike is calculated using the following formula: [pic] Where: Ht |= |Height of the tertiary dike | |DWL |= |Desired Water Level | |GS |= |Elevation of the ground Surface | |MR |= |Maximum Rainfall within 24 hours | |FB |= |Allowance for Freeboard | |%S |= |Percent Shrinkage and settlement | [pic] Figure 28. Design of Different Dikes 4. 3. 3 Canals. About one to two percent of the total farm area is used in the canal system. The main water supply canal starts from the main gate and usually traverses the central portion of the fishfarm. The canal bed should not be lower than, but rather sloping towards, the floor elevation of the main gate. Generally, the canal bed is given a slope of 1/1500 or one meter difference in elevation for a horizontal distance of 1,500 m. A one meter opening main gate will have a canal bed at least 3. m. wide. This width is enough to supply a 10–15 hectares fishpond system considering that the canal dikes have a ratio of 1:1 slope. Secondary water supply canals are constructed in portions of the farm which cannot be reached by the main canal. It starts from the main canal and traverses the inner portion of the fishpond. It is usually constructed in large fishpond areas and smaller than the main canal. Generally, secondary supply canal has a bed width of 2. 0 m. A tertiary canal is usually constructed to supply water in the nursery and transition ponds. Because of the small size, it is sometimes said to be a part of the nursery pond system. Some fish culturists modify the tertiary canal as a catching pond. This usually happens when the designed tertiary canal is short, Generally, a tertiary canal has a bed width of 1. 0–1. 5 m. A diversion canal, when necessary, is also constructed to protect the farm from being flooded with run-off water coming from the watershed. It must be strategically located so that run-off will empty on an established disposal area, natural outlets or prepared individual outlets. It should have the capacity to carry at least the peak run-off from the contributing watershed for a 10-year frequency storm. The slope of the diversion canal should be in such a way that water flows towards the drainage area. A drainage canal is constructed when there is a need to have a separate canal for draining rearing ponds. This is to improve water management in the pond system. It is usually located at the other side of the pond, parallel to the supply canal. A drainage canal is recommended in intensive culture, especially of shrimps. [pic] Figure 29. Design of Different Canals 5. PROJECT COST AND PROGRAMMING The worst error a prospective fishfarm operator can make is to develop an area without project cost estimates and a programme of development. Development money is wasted, and management of the area may be difficult or impossible. Poor planning is the major cause of project failure and even leads to personal bankruptcy. It is very necessary that preparation of the project cost estimates as well as programme of development be done before any construction is started. It is important to know approximately how much will be spent to finish the whole project. It is better that one knows how and when the project will be constructed and completed. The importance of the project cost estimates and programme of development should not be underestimated. 5. 1 Project Cost EStimates The cost of development can be estimated based on the 1) data gathered in the area, 2) proposed layout plan, and 3) design and specification of the physical structures and other facilities. 5. 1. 1 Pre-development estimates a. For the preparation of Feasibility Study. Whether the fishpond operator will apply for a loan in the Bank or he will use his own money to finance the development of a fishpond project, a feasibility study of the area is needed. The feasibility study will be his guide in the development and management of the project. All activities such as the development, management and economic aspects are embodied in the feasibility study. It is a specialized work by engineers, aquaculturist and an economist having special knowledge in fishfarming industry. Usually, for the preparation of the feasibility study, the group charges about 2% to 10% of the total estimated cost of development. b. For the Survey of the Area. An area survey includes a topographic survey, and re-location survey. Whether the area is owned by a private individual or by the government, an area survey by a licensed Geodetic Engineer is very important for the proper location and boundary of the land. It is one of the requirements in the application for a 25-year Fishpond Lease Agreement in the BFAR and also in the application for a loan in the Bank. It must be duly approved by the Bureau of Lands. A topographic survey is necessary in the planning and development of the project. A re-location survey must be conducted to check the validity of the approved plan as well as to avoid conflict in the future. An area and topographic survey done by a Geodetic Engineer will cost about [pic]400. 00 for the first hectare or a fraction thereof and [pic]50. 00 per hectare for the succeeding hectarages. Re-location survey is cheaper than the area and topographic survey. c. For the Construction of a Temporary Shelter. Experienced fishpond laborers generally do not live in the locality. To be more effective they need to have a place to stay during the construction activities. For the construction of a shelter house made of light material, assume a cost of [pic]300. 00/sq. m. of shelter. This includes materials and labor costs. d. For the Construction of Transport Facilities. Flatboats will be needed in the transport of mudblocks. A banca may be used in going to the site. Cost of construction varies from locality to locality. A flatboat with dimensions of 8†² ? 4†² ? 14†³ will cost around [pic]500. 00. A small banca will cost around [pic]600. 00. e. For Representation and Transportation Expenses. This item is not included in the cost of development of a fishpond project. However, it appears that a big amount is being incurred in representation and transportation expenses before the project is started. Example of expenditures are follow-ups of survey plan of the area, FLA application and bank loan. Other expenses are incurred in canvassing of supplies and materials, survey of manpower requirement and equipment needed in the development of a project. Representation and transportation expenses cover about 10–20 percent of pre-development cost. 5. 1. 2 Development Proper. a. For the Clearing of the Whole Area. Clearing the area of vegetation can be divided into three categories, namely: 1) cutting and chopping, 2) Falling and burning, and 3) uprooting and removal of stumps and logs. Generally, cutting and chopping costs about [pic]500. 00 per hectare; piling and burning costs about [pic]300. 00 per hectare; and for the uprooting of stumps and removal of logs, costs depend on their size and number per unit area. A hectare pond, for instance, having 200 stumps of size below 15 cm. in diameter will cost about [pic]800. 00. Stumps numbering 50 pieces with diameter over than 15 cm. will cost about [pic]1,000. 00 per hectare. Cost for the clearing depends upon the prevailing price in the locality. b. For the Construction and Installation of Gates. Cost of construction and installation of a gate can be calculated based on its design and specification proposed in the area. The two kinds of gate commonly constructed in fishponds ( concrete and wood) will be discussed separately. 1. Estimating the cost of construction and installation of a concrete gate: a. Based on the plan of a concrete gate, determine the area and volume of the walls, wings, floor, bridges, toes, aprons and cut walls and compute for the total volume using the following formula: A = L ? W V = A ? t VT = V = V1 + V2 + V3 + †¦ Where: A |= |Area |L |= |Length | |V |= |Volume |W |= |Width | |VT |= |Total volume |t |= |thickness | Determine the number of bags of cement, and the volume of gravel and sand by multiplying the total volume with the factors precomputed for a Class A mixture plus 10% allowance for wastage, thus: |No. of bag cemen t |= |(VT ? 7. 85) + 10% | |Volume of Gravel |= |(VT ? 0. 88) + 10% | |Volume of Sand |= |(VT ? 0. 44) + 10% | Class A mixture has a proportion of 1:2:4, that is one part of cement for every two parts of fine aggregate (sand) and four parts of coarse aggregate (gravel). b. Every square meter of a concrete gate uses 6. 0 m. long of reinforcement bar placed at an interval of 0. 25 m. both ways on center. This is equivalent to 1 ? bars at a standard length of 20 feet per bar. The floor and toes use the same size of bar, thus: No. of reinforcement bar = (Af + 4t) ? 1. 5 Where: Af = Area of the floor At = Area of the toes The walls, wings, etc. use two different sizes of reinforcement bar, thus: [pic] Where: Aw = Area of the walls Ax = Area of the wings An = other areas c. Find the total area of a concrete gate by adding all the areas mentioned in (a). Calculate the weight of tie wire no. 6 by multiplying the total area with a standard value per sq. m. of concrete, thus: Weight (kg) = AT ? 0. 3 Kg/sq. m. d. Calculate the volume of boulders needed by multiplying the area of the flooring with the th ickness of fill. e. Form lumber can be calculated by multiplying the area of walls, wings and bridges by 2. Plywood can also be used as form. Since lumber measurement is still in feet it should be converted into meter, (see conversion table). Use 2†³ ? 3†³ wood for form support. f. Bamboo puno could be calculated from the area of the flooring. A square meter of flooring will require more or less 20 puno staked at an interval of 0. 5 m. both ways on center. This, however, depends upon the hardness of the floor foundation. g. Screens and slabs are calculated based on the design of the concrete gate. h. Assorted nails are calculated based on the thickness of the form lumber used. i. Labor cost is 35–40% of total material cost. However, close estimates can be computed by determining the cost of labor for the construction and removal of temporary earth dike, excavation of the foundation, staking of bamboo puno, placing of boulders and gravel, construction of forms, concr eting of the gate and others. 2. Estimating the cost of construction and installation of a wooden gate. a. Based on the plan of a wooden gate, determine the size and number of lumber for the sidings and flooring. Compute for the total board feet using the following formula: [pic] Where: |L |= |Length of lumber in inches | |W |= |Width of lumber in inches | |t |= |thickness of lumber in inches | b. Based on the design and specification of the pillars and braces, compute for the total board feet using again the above formula. c. Determine the size and number of lumber needed for slabs and screen frames and compute the total board feet. d. Calculate the assorted nails (bronze) based on the lumber used. e. Calculate the coal tar requirement in gallons. f. Calculate the cost of nylon and bamboo screens. g. Calculate the labor cost at 30–40% of the material cost or calculate in detail according to the labor requirement. Calculation includes the construction, painting and installation of the wooden gate and excavation of the floor foundation. c. For the Construction of the Proposed Dikes. Dikes constructed in fishponds vary in sizes. Bigger dikes are, of course, more costly to construct than smaller dikes. In other words, the perimeter or main dike will expend more than the secondary or tertiary dikes. The cost of construction is calculated based on the volume of soil filled and generally it costs [pic]6. 00 per cubic meter. Labor cost, however, depends on the prevailing price in the locality. Transport distance of soil material to the dike is also considered in calculating the cost of construction. Long transport distance decreases individual output per day and thus will increase construction cost. Working eight hours a day, one skilled worker can finish diking, using one flat boat, based on the following distances: |10 – 100 meter distance |6 – 7 cu. m. /day | |101 – 300 meter distance |5 – 6 cu. m. day | |301 – 500 meter distance |4 – 5 cu. m. /day | d. For the Excavation and Leveling of Ponds. Cost for excavation depends upon the volume of soil left inside the pond after the dikes have been constructed. Considering that some soils have been excavated for diking purposes, only about 60% is left for excavation. Generally, escavation co sts about [pic]2. 00 per cu. m. depending upon the prevailing labor cost in the locality. After excavation, leveling of the pond bottoms follows. This involves the cut-and-fill method (excavation and dumping to low portions). Generally, leveling costs about [pic]2,000. 00 per hectare. e. For the Construction of Facilities. Facilities include the caretaker's house, working shed, bodega, chilling tanks, etc. For proper estimates there should be a simple plan of the facilities. However, rough estimates can be made based on the floor area of a house to be constructed. For a house made of light materials, assume a cost of [pic]400. 00 per sq. m. floor area; and for concrete structures, assume [pic]1,000. 00 per sq. m. All assumed costs include materials and labor based on 1979 price of materials. f. For the Purchase of Equipment. A fishpond project cannot be operated without equipment. Examples are fish nets, digging blades, shovels, scoop nets, bolos, etc. These items should be included as part of the total development cost. Such equipment should be listed and calculated. g. Contingencies. There should be a contingency fund for unforeseen expenditures, increase of prices and other materials not included in the above calculations. Assume 10% of the above costs for contingencies. 5. 1. 3 Cost estimate For the purpose of determining the cost of developing a new brackishwater fishfarm project, a typical example of a 50-hectare fishpond project applied to the Bureau of Fisheries and Aquatic Resources for a 25-year Fishpond Lease Agreement is presented below. |I. Pre-Development |   | | |1. |For the preparation of feasibility study |[pic]1,000. 00 | | |2. |Re-location of boundaries |2,000. 00 | | |3. |For the construction of temporary shelter for laborers (light materials) |4,000. 00 | | |4. |For the construction of flatboats, 5 units at [pic]500. 00/unit |2,500. 00 | | |5. |For the purchase of small banca, 1 unit at [pic]600. 00 |600. 00 | | |6. For representation and transportation expenses |3,000. 00 | | |Sub-total |[pic]13,100. 00 | |II. |Development Proper |   | | |1. |Clearing of the area at [pic]600. 00/ha. (cutting, chopping, burning & removal of logs |[pic]30,000. 00 | | |2. |Construction of dikes (filling, compacting and shaping by manual labor) |   | | | |a. |Main dike along bay and river 1,920 linear meters, 6. 0 m base, 2. 0 m crown and 2. 25 m|103,680. 00 | | | | |height or a total of 17,280 cum. at [pic]6. 00/cu. | | | | |b. |Main dike along upland, 840 linear meters, 5. 5 m base, 2. 0 m crown, and 2. 0 m height |37,800. 00 | | | | |or a total of 6,300 cu. m at [pic]6. 00/cu. m | | | | |c. |Main canal dike, 980 linear meters, 5. 0 m base, 2. 0 m crown, and 1. 8 m height, or a |33,957. 00 | | | | |total of 6,174 cu. m. at [pic]5. 50/cu. m | | | | |d. |Secondary dike, 2,540 linear meters, 4. 0 m base, 1. 0 m crown & 1. 5 m heig ht or a |52,387. 50 | | | | |total of 9,525 cu. at [pic]5. 50 per cu. m | | | | |e. |Secondary canal dike, 400 linear meters, 4. 0 m base, 1. 5 m crown and 1. 4 m height, or|8,470. 00 | | | | |a total of 1,540 cu. m at [pic]5. 50 per cu. m | | | | |f. |Tertiary canal dike, 240 linear meters, 3. 5 m base, 1. 5 m crown and 1. 2 m height or a|3,600. 00 | | | | |total of 720 cu. m at [pic]5. 00 per cu. m | | | | |g. |Tertiary dike, 700 linear meters, 3. 0 m base, 1. 0 m crown and 1. m height or a total|7,000. 00 | | | | |of 1,400 cu. m at [pic]5. 00 per cu. m | | | |3. |Construction and installation of gates |   | | | |a. |Main double opening concrete gate, 2 units at [pic]20,000/unit including labor cost |40,000. 00 | | | |b. |Construction and installation of 10 units secondary wooden gates at [pic]3,000. 00 per|30,000. 00 | | | | |unit | | | | |c. Construction and installation of 15 units tertiary wooden gates at [pic]1,500/unit |22,500. 00 | | |4. |Excavation and levelling of pond bottoms (cut-and-fill) |   | | | |a. |Nursery Pond, 1. 5 ha at [pic]2,000/hectare |3,000. 00 | | | |b. |Transition Pond, 4. 0 ha at [pic]2,000/ha |8,000. 00 | | | |c. |Formation Pond, 8. 0 ha at [pic]2,000/ha |16,000. 00 | | | |d. |Rearing Pond, 32. 0 ha at [pic]2,000/ha |64,000. 00 | | |5. Uprooting and removal of stumps at [pic]600/ha |30,000. 00 | | |6. |For the construction of facilities |   | | | |a. |Caretaker's Hut made of light materials, 2 units at [pic]6,000/unit |12,000. 00 | | | |b. |Bodega, made of light materials for inputs and equipment, 1 unit |5,000. 00 | | | |c. |Chilling tank with shed, made of light materials |3,000. 00 | | |7. |For the purchase of equipment |   | | | |a. Nets for harvesting |3,000. 00 | | | |b. |Digging blades and carpentry tools |1,000. 00 | | | |c. |Containers |2,000. 00 | | |8. |Contingencies (10% of cost) |52,350. 05 | | |Sub-total |[pic]562,750. 55 | | |T O T A L |[pic]575,850. 55 | ESTIMATED COST FOR ONE UNIT DOUBLE OPENING MAIN CONCRETE GATE |I. Cost of Materials | | |   | |Quantity |Unit Price |Amount | | |1. |Cement |140 bags |[pic]24. 00/bag |[pic]3,360. 00 | | |2. |Sand |10 cu. m. |60. 00/cu. m |600. 00 | | |3. |Gravel |20 cu. m |80. 00/cu. m |1,600. 00 | | |4. |Boulders |8 cu. m |50. 00/cu. m |400. 00 | | |5. Reinforcement Bar | | | |a) ? ? ? 20†² |80 pcs |22. 00/pc |1,760. 00 | | | |b) ? 3/8 ? 20†² |35 pcs |12. 00/pc |420. 00 | | |6. |Plywood form |49 pcs |48. 00/pc |2,352. 00 | | | |(? ? 4†² ? 8†³) | | | | | |7. |Lumber (S4S) | | | |a) 2†³ ? 2†³ ? 12†² |30 pcs |3. 0/bd. ft |360. 00 | | | |b) 2†³ ? 3†³ ? 12†² |16 pcs |3. 00/bd. ft |288. 00 | | | |c) 1†³ ? 2†³ ? 12†² |10 pcs |3. 00/bd. ft |60. 00 | | | |d) 1†³ ? 12†³ ? 12†² |6 pcs |3. 00/bd. ft |216. 00 | | |8. |Assorted Nails |10 kgs |7. 50/kg |75. 00 | | |9. |G. I. Wire #16 |20 kgs |8. 00/kg |160. 00 | | |10. Bamboo Puno |400 pcs |4. 00/pc |1,600. 00 | | |Sub-tot al |[pic]13,251. 00 | |II. |Labor (40% of material cost) |5,300. 00 | |III. |Contingencies (10% of material cost) |1,325. 00 | | |T O T A L |[pic]19,876. 00 | | |say |[pic]20,000. 00 | ESTIMATED COST FOR ONE UNIT SECONDARY WOODEN GATE |I. Cost of Materials | | |   |   |Description |Quantity |Unit Price |Amount | | |1. |Ply Board |1†³? 10†³? 14†² |34 pcs. |[pic]3. 00/bd. ft|[pic]1,190. 00| | | | | | |. | | | | | |1†³? 10†³? 8†² |3 pcs. |3. 00/bd. ft. |60. 00 | | |2. |Slabs |1†³? 12†³? 14†² |2 pcs. |3. 00/bd. ft. |84. 00 | | |3. |Pillars and   Braces |2†³? 3†³? 10†² |4 pcs. 3. 00/bd. ft. |60. 00 | | | | |2†³? 3†³? 8†² |7 pcs. |3. 00/bd. ft. |84. 00 | | | | |2†³? 3†³? 14†² |2 pcs. |3. 00/bd. ft. |42. 00 | | | | |3†³? 4†³? 10†² |12 pcs. |3. 00/bd. ft. |360. 00 | | |4. |Screen Frames |2†³? 3†³? 16†² |2 pcs. |3. 00/bd. ft. |48. 00

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The health effects of cannabis marijuana - Essay Example This damage is similar in severity to the damage of those who suffer from lung cancer (Zimmer & Morgan, 2007, p. 20). The mildest respiratory effects of the consumption of marijuana include bronchitis, exacerbated phlegm production as well as emphysema. A study revealed that 36% of patients admitted to the hospital in the United States with flue-like symptoms were suffering from the side effects of consuming marijuana (Tashkin et al., 2004, p. 2). Moreover, in severe cases, heavy marijuana users may develop lethal complications. Hence, a massive Swedish study in 2013 has identified that 40 years of marijuana consumption double the risk of having lung cancer (Callaghan et al., 2013, pp. 1811-1820). Moreover, has a disastrous effect on cardiovascular system. Therefore, marijuana accelerates heartbeat and may provoke inflammatory processes in blood vessels. Moreover, a group of researchers from Birmingham, UK, has concluded that marijuana is likely to increase the risk of arrhythmias as well as causes dizziness and provokes falls (Krishnamoorthy et al., 2009, pp. 851-856). Furthermore, due to ethical concerns, the studies aimed to investigate the relationship between the consumption of marijuana and reproduction. The studies conducted on primates revealed that with the chronic consumption of marijuana sperm count decreased by a margin of 61% in males. Fertility in females decreased by up to 53%. Moreover, even with the surviving sperm cells their motility and ability to fertilize egg cells was significantly degraded (Zimmerman & Raj, 2007, p. 10). Krishnamoorthy, S., Lip, G., & Lane, D. (2009). Alcohol and Illicit Drug Use as Precipitants of Atrial Fibrillation in Young Adults: A Case Series and Literature Review.  The American Journal of Medicine,  122(9), 851-856. Zimmerman, S. & Raj, A. Y. (2007). Effects of cannabinoids on spremtogenesis in mice. In G. G. Nahas and W. D. M. Paton

Victimless crimes Research Paper Example | Topics and Well Written Essays - 2500 words

Victimless crimes - Research Paper Example Victimless crimes include such activities as; prostitution, abortion, drug use, gambling, assisted suicide, not wearing a seatbelt, consumption of pornography among others. In some circumstances, the crime is an individual act such as not wearing a seatbelt and sometimes it involves consent by two or more adults to commit a criminal offense such as prostitution in which no other person is involved hence are referred as consensual crimes (Fernandez, 11). Although they are considered victimless, the persons involved are harmed in one way or another hence it is considered a serious public health issue which should be dealt with. Criminalization of victimless crimes has often been considered as a waste of state resources as the desired effects are in most cases not achieved. Hardaway Robert argues that the costs involved far outweigh the benefits since the results are counterproductive. For example, the war on drugs has done little to curb drug abuse as US comprises 5% of world populatio n and consumes 50% of cocaine produced not forgetting the ruined lives of those incarcerated (7). He also notes that Netherlands has the lowest abortion rate in the world despite legalizing abortion whereas Romania has the highest abortion rate in Europe despite its criminalization policies. Richards (1218) also notes that the moral arguments advanced by the proponents of criminalization do not hold any ground as they are contestable. This paper will discuss the legislations passed pertaining to criminalization and legalization of victimless crimes as well as the harms and benefits of such legislations. Left to act like a free market without any form of government interference, victimless crimes can lead to health problems for the individuals involved as well as costs to the society as a whole hence minimal intervention is required to correct failures and achieve public order. History of Victimless Crimes The issue of victimless crimes arose with the prohibition of alcohol and tobac co. The 18th amendment prohibited the manufacture, sale, import and export of alcohol for beverage use (Fernandez, 14). Alcoholic beverages are consumed widely and prohibition thus resulted in search for illegal means of satisfying their needs. Illegal taverns were therefore set up to manufacture the illicit beverages in uncontrolled manner leading to loss of lives, blindness and increased violence. Legitimate brewers were kicked out of the market and the price of the product escalated as the mafia class emerged which controlled the trade. To be able to purchase the illegal drink in the black market, some users resulted to crime hence the growth of organized crime in the US (20). Violence also increased as gangs fought for the control of the lucrative business. Corruption was also evident as government officers aided cartels to operate their illegal businesses without interruptions. Violent criminals were handed down reduced sentences to allow space for convicts of alcohol Due to th ese negative consequences; the amendment was repealed in 1933. According to Friedman (445), in the early days, prostitution was not criminalized. However, owning a brothel was considered a crime. Adultery on the other hand, was a crime that attracted corporal punishment (Gaines & LeRoy, 5). Fornication was

Barge Haulers on the Volga Assignment Example | Topics and Well Written Essays - 500 words

Barge Haulers on the Volga - Assignment Example This is because they are hauling the large boat upstream against the water currents and the sun is overhead. The figures of the men are positioned at the centre of the painting. At the background of the painting there are clouds seen from a distance and on the ground, there is water seen in the background where the men have pulled the boat from. Their landscape is also shown from a distance. The source of light is on top of the men as this is shown in their short shadows (Bolton, 2010). The shadows of the men are almost beneath them showing that the source of light was on top of them. The landscape in the background helps to prove and show the direction of the river and its currents. It clearly shows that the men are pushing the bought upstream. The tonal range of the painting is medium as their colours used are not so striking. The artwork has a blue tonal range because of the water and there is also some yellow standing out depicting the source of light. In the art, I see the eleven dressed in rags and they are also bound with leather harnesses. The painting brings out both the appreciation and celebration of men’s fortitude and dignity and at the same time, it highly condemns the people who sanctioned the inhumane activity. As much as the painting shows them to be accepting the men are defeated. Their faces and posture in the painting show physical discomfort. In the painting I only see one person coming out strongly. It is the youth who is brightly coloured and he seems to fight against the binds of leather and he appears to take a heroic poise (Cohen, 2008). He has raised his head to stare into the distance. This shows he has hope that there is redemption coming. The inverted Russian flag clearly shows that whatever is happening is not right or allowed. There is movement in the artwork and this is showed by the currents of water. The men also seem to be in motion hauling the boat. The artist has made the two-dimensional wor k to look as if in the third dimension by use of shades of colour.  

Problem definition Essay Example | Topics and Well Written Essays - 250 words - 1

Problem definition - Essay Example Although there are movable shields that can be in some of the lathes, there are few to be used in all lathes simultaneously. Moreover, only a few lathes have a break that is a concern according to established standards. II. The students are also disadvantaged in the shop in terms of technology. The students have only been exposed to manual means of operation. This is the case while technology has been embraced in operation of machines. As it is, technology has enabled to put some requirements in the computer and the machine progresses on its own. However, manual operation may be paramount to the students but makes them be behind in terms of embracing technology. The college prides itself as having Mechatronics major as a primary area of study. One of the core issues to be covered on this are is designing and machine operation. Hence, it is paramount that students are exposed on right C&C equipment. Therefore, lack of these equipments will deny the students the proper accreditation they need. The fact is that there is enough money for this upgrade. Grants have also been made available for installation of C&C lathes. The soon this is done the better for proper utilization of time by the

Poets of the 18th century Essay Example | Topics and Well Written Essays - 1000 words

Poets of the 18th century - Essay Example Likewise, Gulliver's adventures in Laputa illustrate Swift's negative opinion of the general value of science produced by the Royal Society as the scientists and doctors of the floating city continuously spend their time involved in meaningless pursuits that bring benefit to no one. Finally, in his fourth voyage, Gulliver's encounter with the Houyhnhnms creates a strong commentary on the true picture of human nature in which the conception of war has not even been considered, much less worked out to the fine science Gulliver describes to his astonished hosts. "Ironically Gulliver's Travels, a book thought by most people as a charming book of adventure popular with children, is one of the most powerful attacks ever made against man's wickedness and stupidity. Swift's book is full of personal, literary and political allusions" (Taralunga, 2003: 135). William Blake's poems typically focused on aspects of the human spirit as it comes in contact with authority figures, whether they be government or religious, as well as the joyful celebration of his idea of Christianity and humanity. As a result, his poems provided many with inspiration and hope in times that seemed overly chaotic as revolutions of various types were occurring on virtually every front and power structures were struggling to hold onto whatever controls they could. In "London" for example, a poem describing the way in which the human spirit had been shackled in 1794 when the poem had been written, Blake expresses an abiding belief in the unchristian nature of the restrictions on freedoms being experienced by the British people. The French Revolution had just occurred and sentiment in Britain had reached an all-time low as expressed in lines such as "How the chimney-sweepers cry" (9) and "' the hapless Soldiers sigh / Runs in blood down Palace walls" (11-12) in which it can be seen that even time-honored occupations such as chimney sweeps and soldiers had fallen into disrespect and despair. The red walls of the street depicted in the poem's illustration provide a subtle imagery of the British soldiers' and, by extension, the rest of the British population's plight. Although he is describing physical situations, "A mark in every face I meet / Marks of weakness, marks of woe" (3-4), he makes it clear that he is also discussing the state of the souls of people he meets, "In every voice; in every ban / The mind-forg'd manacles I hear" (7-8). 7. Write about one of the poets specifically and the subjects / themes he is best known for: Blake's dual nature of man; Burns's view of human position or importance; Wordsworth's child / man connection; Coleridge's flights of imagination; Shelley's willingness to bare his soul or his

The balance between cost and quality Essay Example for Free

The balance between cost and quality Essay Before we look closer into the subject, first we must look at exactly what is meant by quality and cost. Quality is the totality of the attributes of a good or service that meet the requirements of the buyer or customers. The materials which make up the product, the design and the engineering of the product, product performance, reliability and durability are all important characteristics of the quality package, which ultimately influence customers to buy a product and repeat-purchase It. (Pass 1995) Cost is the expenditure upon resources incurred by a firm in producing and selling its output, Each cost is a charge against revenues and profits for the use or consumption of resources during a trading period. Cost can be classified along the functional lines, distinguishing between production, selling, distribution, administration and finance costs. (Pass 1995) Quality is a term we use to signify excellence of a product or service. We think of a quality product, for example a B.M.W. motorcar. We know its well designed, well built and will therefore last a long time. If we think of car of being low quality, we think of something like a basic model type of Citroen or Fiat, with its flimsy panels, cheap components and low specifications. The quality hotel is denoted by the internationally recognised star rating system, i.e. a 1 star hotel will provide the most basic of comforts and low on hygiene, and a 5 star hotel will provide the most comforts and services. We can immediately recognise then, by simply looking at a hotels star rating how good it will be and how good of a time we will have if we stay at the hotel. Total Quality Management (TQM) is an organisational process that actively involves every function and every employee in satisfying customers needs, both internal and external. TQM works by continuously improving all aspect of work through structured control, improvement and planning activities that are carried out in concern with guiding principles that focuses on Quality  and Customer Satisfaction as the top priorities. TQM recognises that the Customer is at the centre of every activity. The customer may be external or internal. The key is to determine the gap between what the customer needs and what the system delivers. Once the gap is recognised, it would be systematically reduced and results in never-ending improvement in customer satisfaction at every level. The balance between cost and quality in purchasing is questioned when an organisation is looking to purchase the best for what they can get for their money. However, this is not always the case. One of the main considerations in the purchasing functions is that the quality in question is fit for purpose. Sometimes the overriding factor on the decision to purchase is that products are of the highest quality. E.g. luxury car manufacture Roll Royce will pride themselves on using the finest materials when manufacturing their cars. When at the ordering stage the emphasis will be on high quality rather then cost. Keeping cost to a minimum is an important factor for any business including companies like Roll Royce (to a certain degree). However, Roll Royce will not compromise their image of quality for the sake of cost. Often, a company has no choice but to use the most expensive materials or highest quality that money can buy. Sometimes safety is the overriding factor. If Rolls Royce is building an engine that is going to be mounted onto an aircraft, then titanium will be the preferred choice of material. Titanium is extremely expensive but will guarantee the utmost reliability in this situation. As mentioned above, purchasers have to take into consideration whether or not the quality is fit for purpose and what the product is going to be used for. The decisions that are made can be made personally for individual use or at corporate level. E.g. if a purchasing manager for a car manufacturer has to make a decision on the type radio to buy, then there is a combination of factors that will need to be considered. The price will have to suit his budget. The quality would have to be of a standard that one would expect from a car of that type from the company. The buyers final decision may well be to buy a radio system that he or she would never consider putting in their own car. But yet the decision made will mean that the system chosen will go into thousands of newly built cars. This is because the decision made was not personal; it was made of behalf of a company so it had to suit their needs. Many purchasing managers are under constant pressure to drive cost down. Even professionals have problems finding the balance between cost and quality when their budget is very low. If costs are too low then it seems inevitable that the quality will suffer. The Ford motor company has suffered the consequences of cutting costs too low. After rave reviews following introduction of the new Ford Focus into the US market, Ford decided to build the car using cheaper components in a bid to save money. The cheaper components included rear wheel bearings that would prematurely wear, causing noise and wheel instability. Not only does Ford now has to recall thousands of Ford Focuses, but it also has to deal with the fact the this decision has damaged their reputation even further. As people we are constantly trying to find the balance between costs and are own perception of quality on a daily basis. According to Juran, quality is: fitness for intended use. This definition basically says that quality is meeting or exceeding customer expectations. So according to this theory, we achieve quality when we buy a product that does what its supposed to do. If a purchasing manager is buying radios that he or she wouldnt use personally, this still ties in with Jurans definition of quality because the radios will meet the customers expectations, although is will not meet the buyers. When we shop we have to ask ourselves if the use of the product will justify the cost. E.g. when studying late at night, the natural choice of beverage for some students would be something like the caffeine boosting energy drink Red Bull at the cost of ?25. ?25 is far too much to pay (double) for a can of fizz pop. On this particular occasion, the beverage will not be used as a  thirst quencher or as a vodka mix, but used as an aid to keep the student awake through the studying session. The cost (?25) of the product is justified due to the products fitness for intended use. Deming states that the customers definition of quality is the only one that matters. This is true but I feel that the customer does not always get quality from what they perceive as quality. This is partly to do with the fact that some companies are very good at doing some things, but is not so good at others. Designer label brand Gucci is a prime example of this. If somebody buys a Gucci designer watch for the cost of ?0, there are a host of other things that the buyer will achieve like admiration, prestige and self-esteem. Gucci is not a watchmaker and does not have the same level of expertise of watch making as Rolex or Cartier. Although somebody who does not have knowledge of watches may perceive this watch as quality. Those with know-how or those in the industry would regard this watch as crap. Watches of this nature are purely soled through success of the brand. The watches are simply a spin-off from their designer clothesline and are made with very low quality and cheap components. According to Which magazine, the life expectancy for a Gucci watch is two three years. This is very low compared to Rolexs lifetime life expectancy. looking at Passs definition of quality, a Gucci watch does not carry vital characteristics such as, reliability and durability, which are key to the quality package. This brings us to Demings theory that the customers definition of quality is the only one that matters. I appreciate that the customers opinion is all that matters them, but whether or not the customer is actually receiving quality is another matter. If a product were purchased on the basis of the customer being happy with the product initially, then it would be very difficult to apply Demings theory of quality if the product has hidden defects. Similar to the phrase, things arent always what they seem. To achieve high quality, a company does not have to always have to pay the high costs. For example the cars produced by the Japanese used to be of low quality and unreliability was common. Things have changed now. Japaneses  cars are now built to an excellent standard and reliability is second to none. Not only are the Japanese building excellent cars, they are building them at a great speed. This is partly due to lean supply techniques that the Japanese have mastered. The whole area of purchasing and suppliers is streamlined to achieve minimum waste. Adopting these techniques cannot be done over night, but lean supply is an excellent step in the right direction in achieving a good balance between cost and quality long-term. Philip B. Crosby (1979) believed in the zero-defects program adopted by the US federal government defining quality as conformance to requirements. He emphasized prevention rather than inspection (audits) and promoted a definition of quality as meeting the customers requirements the first time and every time. His work is part of TQM. Crosbys (1979) philosophy on quality is driven solely by prevention of defects. It is expressed in a phrase he uses: Do it right the first time and every time. Crosby emphasizes zero defects, given that he believes there is only one level of quality. In other words, the presence of any flaw in the product deprives it of quality. He believes managements perception and attitude towards quality needs to be transformed if the organisation is going to succeed at delivering quality consistently. For example, Deming and many managers believe that error is inevitable and one only has to deal with it. Crosby believes it is self-defeating to plan and invest in strategies that deal with errors instead of investing in strategies and processes that prevent errors from occurring in the first place (Garvin and March, 1986). The Lean thinking method allows Japanese car manufactures have strong relationships with their suppliers and offer incentives for better quality. E.g. The supplier will carry out rigorous tests on their products before the buyer receives it to ensure reliability. Purchasing can improve quality by contributing to the competitive advantage of the undertaking by participating in the procurement of bought out items at the economical cost. It is important to ensure that quality is not confused with price and grade. Managers should be using their extensive knowledge and expertise to provide high quality to both internal and external customers of the purchasing function. To maximise quality, the purchasing departments responsibilities should meet with the requirements of BS/ EN and BS 7750 Keeping the balance between cost and quality in an important factor for any business. As mentioned above, it depends on what the buyer is trying to achieve overall. If high quality is the overriding factor for a company, then this will tie in with the companies high quality image. Whether it is no frills or impeccable quality, managers will try to find a reasonable balance where appropriate. Bibliography Lysons, K (2000) Purchasing and supply chain management. 5th edition. Prentice Hall Crosby, P. (1984) Quality without tears. 1st edition. Mc Graw Hall companies Crosby, P. (1995) Quality is still free. Mc Graw Hall companies Crosby, P. (1979) Quality is free. . Dutton signet Garvin, D.A. and A. March. (1984) A Note on Quality: The Views of Deming, Juran and Crosby. Boston, MA: Harvard Business School Press. Juran, J.M. (1988) Juran on Planning for Quality, New York: Free Press,. http://www.which.co.uk/

Calculations of the Spin Structure of Trimer Cr3

Calculations of the Spin Structure of Trimer Cr3 Calculation of Magnetic Properties by Generalized Spin Hamiltonian and Generation  of Global Entanglement: Cr Trimer in molecule and on surface Oleg V. Stepanyuk2, Oleg V. Farberovich1 1 Raymond and Bekerly Sackler Faculty of Exact Sciences,  School of Physics and Astronomy, Tel-Aviv University, Tel-Aviv 69978, Israel 2 Max Planck Institute of Microstructure Physics, Halle, Germany Here we present the results of the first-principles calculations of the spin structure of trimer Cr3  with the use of a density-functional scheme allowing for the non-collinear spin configurations in  [1]. Using the results of these calculations we determine the Heisenberg-Dirac-Van Vleck (HDVV)  Hamiltonian with anisotropic exchange couplings parameters linking the Cr ions with predominant  spin density. The energy pattern was found from the effective HDVV Hamiltonian acting in the  restricted spin space of the Cr ions by the application of the irreducible tensor operators (ITO)   technique. Comparison of the energy pattern with that obtained with the anisotropic exchange  models conventionally used for the analysis of this system and with the results of non-collinear  spin structure calculations show that our complex investigations provides a good description of the  pattern of the spin levels and spin structures of the nanomagnetic trimer Cr3. The results are   discussed in the view of a general problem of spin frustration related to the orbital degeneracy of  the antiferromagnetic ground state.   PACS numbers: I. INTRODUCTION Information technologies provide very interesting challenges  and an extremely wide playground in which scientists  working in materials science, chemistry, physics and  nano-fabrication technologies may find stimuli for novel  ideas. Curiously, the nanometre scale is the molecular  scale. So we may wonder whether, how or simply which  functional molecules can be regarded in some ways as  possible components of nanodevices. The goal is ambitious: it is not just a matter to store information in a 3dmetal  trimer on a non-magnetic substrate, but we may  think to process information with a trimer and then to  communicate information at the supramolecules containg  from magnetic 3d-metal trimer on a surface. Spins are alternative complementary to charges as degrees  of freedom to encode information. Recent examples,  like for instance the discovery and application of Giant  magnetoresistance in Spintronics, have demonstrated  the efficient use of spins for information technologies. Moreover, spins are intrinsically quantum entities and  they have therefore been widely investigated in the field  of quantum-information processing. Molecular nanomagnets  are real examples of finite spin chains (1D) or clusters  (0D), and therefore they constitute a new benchmark  for testing models of interacting quantum objects. New physics of molecular magnets feeds hopes of certain  prospective applications, and such hopes pose the  problem of understanding, improving, or predicting desirable  characteristics of these materials. The applications  which come into discussion are, for instance, magnetic  storage (one molecule would store one bit, with  much higher information storage density than accessible  with microdomains of present-day storage media or magnetic  nanoparticles of next future). In order to exploit  the quantum features for information processing, molecular  spin clusters have to fulfil some basic requirements. Magnetic transition metal nanostructures on nonmagnetic  substrates have attracted recently large attention  due to their novel and unusual magnetic properties[2,3]. The supported clusters experience both the  reduction of the local coordination number, as in free  clusters, as well as the interactions with the electronic  degrees of freedom of the substrate, as in embedded clusters.   The complex magnetic behavior is usually associated  with the competition of several interactions, such  as interatomic exchange and bonding interactions, and  in some cases noncollinear effects, which can give rise to  several metastable states close in energy. The ground  state can therefore be easily tuned by external action  giving rise to the switching between different states. In recent years, entanglement has attracted the attention  of many physicists working in the area of quantum  mechanics [1, 2]. This is due to the ongoing research in  the area of quantum information [3]. Theoretical studies  are also important in the context of spin interactions  inside two structured reservoirs [9] such as single magnetic  molecule (SMM) and metal cluster on nonmagnetic  surface. Cr is unique among the transition-metal  adatoms, because its half-filled valence configuration  (3d54s1) yields both a large magnetic moment and strong  interatomic bonding leading to magnetic frustration. We  apply our method to Cr trimers deposited on a Au(111)  surface and the trinuclear hydroxo-bridged chromium  ammine complex [Cr3(NH3)10(OH)4]Br5  · 3H2O. Low-lying excited states of a magnetic system are generally  described in terms of a general spin-Hamiltonian. For a magnetic system with many spin sites, this phenomenological  Hamiltonian is written as a sum of pairwise  spin exchange interactions between adjacent spin  sites in molecule and surface. In the present work we study entanglement between  the spin states in the spin spectrum. In our model, a  spin state interact with a continuum of the spin structure  at interval temperature 0 – 300 K, and entanglement  properties between the spin states in spin structure are  considered. Using global entanglement as a measure of  entanglement, we derive a pair of distributions that can  be interpreted as densities of entanglement in terms of  all the eigenvalue of the spin spectrum. This distribution  can be calculated in terms of the spectrum of spin excitation  of cluster surface and supramolecule. With these  new measures of entanglement we can study in detail  entanglement between the spin modes in spin structure. The method developed here, in terms of entanglement  distributions, can also be used when considering various  types of structured reservoirs [..]. II. THE THEORETICAL APPROACH In order to give a theoretical description of magnetic  dimer we exploit the irreducible tensor operator (ITO)  technique [ITO]. Let us consider a spin cluster of arbitrary  topology formed from an arbitrary number of magnetic  sites, N, with local spins S1, S2,, SN which, in  general, can have different values. A successive spin coupling  scheme is adopted: S1 + S2 = SËÅ"2, SËÅ"2 + S3 = SËÅ"3, , SNËÅ"à ´Ã¢â€š ¬Ã¢â€š ¬Ã¢â€š ¬1 + SN = S, where ËÅ" S represents the complete set of intermediate spin  quantum numbers SËÅ"k, with k=1,2,,N-1.The eigenstates  | và ¢Ã… ¸Ã‚ © of spin-Hamiltonian will be given by linear combinations  of the basis states | ( ËÅ" S)SMà ¢Ã… ¸Ã‚ ©: | và ¢Ã… ¸Ã‚ © = ÃŽ £ (~S )SM à ¢Ã… ¸Ã‚ ¨(~S )SM | và ¢Ã… ¸Ã‚ © | (~S )SMà ¢Ã… ¸Ã‚ ©, (1) where the coefficients à ¢Ã… ¸Ã‚ ¨( ËÅ" S)SM | và ¢Ã… ¸Ã‚ © can be evaluated once  the spin-Hamiltonian of the system has been diagonalized. Since each term of spin-Hamiltonian can be rewritten  as a combination of the irreducible tensor operators  technique[ITO].In [ITO] work focus on the main physical  interactions which determine the spin-Hamiltonian and  to rewrite them in terms of the ITO’s. The exchange  part of the spin-Hamiltonian is to introduced: Hspin = H0 + HBQ + HAS + HAN. (2) The first term H0 is the Heisenberg-Dirac Hamiltonian,  which represents the isotropic exchange interaction, HBQ  is the biquadratic exchange Hamiltonian, HAS is the antisymmetric  exchange Hamiltonian,and HAN represents  the anisotropic exchange interaction. Conventionally,  they can be expressed as follows [ITO]: H0 = −2 ÃŽ £ i;f Jif bSi bSf (3) HBQ = − ÃŽ £ i;f jif ( bSi bSf )2 (4) HAS = ÃŽ £ i;f Gif [ bSi Ãâ€" bSf ] (5) HAN = −2 ÃŽ £ i;f ÃŽ £ _ J_ if bS_ i bS_ f (6) with ÃŽ ± = x, y, z We can add to the exchange Hamiltonian  the term due to the axial single-ion anisotropy: HZF = ÃŽ £ i Di bSz(i)2 (7) where Jif and J_   if are the parameters of the isotropic and  anisotropic exchange iterations, jif are the coefficients of  the biquadratic exchange iterations,and Gif=-Gfi is the  vector of the antisymmetric exchange. The terms of the  spin-Hamiltonian above can be written in terms of the  ITO’s. Both the Heisenberg–Dirac and biquadratic exchange  are isotropic interactions. In fact, the corresponding  Hamiltonians can be described by rank-0 tensor operators  and thus have non zero matrix elements only  with states with the same total spin quantum number  S (ΔS,ΔM=0). The representative matrix can be decomposed  into blocks depending only on the value of S  and M. All anisotropic terms are described by rank-2  tensor operators which have non zero matrix elements  between state with ΔS=0, ±1, ±2 and their matrices can  not be decomposed into blocks depending only on total  spin S in account of the S–mixing between spin states  with different S. The single-ion anisotropy can be written  in terms of rank-2 single site ITO’s [ITO]. Finally,  the antisymmetric exchange term is the sum of ITO’s of  rank-1. The ITO technique has been used to design the MAGPACK  software [ITO1], a package to calculate the energy  levels, bulk magnetic properties, and inelastic neutron  scattering spectra of high nuclearity spin clusters that  allows studying efficiently properties of nanoscopic magnets. A. Calculation of the magnetic properties Once we have the energy levels, we can evaluate different  thermodynamic properties of the system as magnetization,  magnetic susceptibility, and magnetic specific  heat. Because anisotropic interactions are not included,  the magnetic properties of the anisotropic system do not  depend on the direction of the magnetic field. For this  reason one can consider the magnetic field directed along  arbitrary axis Z of the molecular coordinate frame that  is chosen as a spin quantization axis. In this case the  energies of the system will be à Ã‚ µ_(Ms)+geÃŽ ²MsHZ, where  Ãƒ Ã‚ µ_(Ms) are the eigenvalues of the Hamiltonian containing  magnetic exchange and double exchange contributions  (index ÃŽ ¼ runs over the energy levels with given total  spin protection Ms). Then the partition function in the  presence of the external magnetic field is given by: Z(HZ) = ÃŽ £ Ms;_ exp[−à Ã‚ µ_(Ms)/kT] ÃŽ £ Ms exp[−geÃŽ ²MsHZ/kT] (8) Using this expression one can evaluate the magnetic susceptibility  Ãâ€¡ and magnetization M by standart thermodinamical  definitions: χ = ( ∂M ∂H ) H!0 (9) M(H) = NkT ∂lnZ ∂H (10) B. Entanglement in N-spin system Entanglement has gained renewed interest with the development  of quantum information science. The problem  of measuring entanglement is a vast and lively field of research  in its own. In this section we attempt to solve the  problem of measuring entanglement in the N-spin cluster  and supramolecules systems. Based on the residual  entanglement [9] (Phys. Rev. A 71, 044301 (2005)), we  present the global entanglement for a N-spin state for the  collective measures of multiparticle entanglement. This  measures introduced by Meyer andWallach[..]. The MeyerWallach  (MW) measure written in the Brennen form (G.K.Brennen,Quantum.Inf.Comp.,v.3,619 (2003)) is: Q(ψ) = 2(1 − 1 N ÃŽ £N k=1 Tr[Ï 2 k]) (11) where Ï k is the reduced density matrix for k-th qubit.   The problem of entanglement between a spin states in  N-spin systems is becoming more interesting when considering  clusters or molecules with a spectral gap in their  densities of states. For quantifying the distribution of  entanglement between the individual spin eigenvalues in  spin structure of N-spin system we use the density of entanglement. The density of entanglement ÃŽ µ(à Ã‚ µ_, à Ã‚ µ_, à Ã‚ µ)dà Ã‚ µ gives the entanglement between the spin eigenvalue à Ã‚ µ_ and spin eigenvalue à Ã‚ µ_ with in an energy interval à Ã‚ µ_ to à Ã‚ µ_ + dà Ã‚ µ_. One can show that entanglement distribution can be  written in terms of spectrum of spin exitation S(à Ã‚ µ_, à Ã‚ µ) = |c_|2 ÃŽ ´(à Ã‚ µ − à Ã‚ µ_) (12) and ÃŽ µ(à Ã‚ µ_, à Ã‚ µ_, à Ã‚ µ) = 2S(à Ã‚ µ_, à Ã‚ µ)S(à Ã‚ µ_, à Ã‚ µ) (13) where coefficient c_ = à ¢Ã… ¸Ã‚ ¨( ËÅ" S)SM | và ¢Ã… ¸Ã‚ © is eigenvector of the  spin-Hamiltonian of the cluster or supramolecule. Thus,  entanglement distributions can be derived from the excitation  spin spectrum Q(à Ã‚ µ) = 1− 2Δ2 Ï€2N ÃŽ £N _=1 |c_|2 (à Ã‚ µ − à Ã‚ µ_)2 + Δ2 ÃŽ £N _=_+1 |c_|2 (à Ã‚ µ − à Ã‚ µ_)2 + Δ2 (14) Though the very nature of entanglement is purely  quantum mechanical, we saw that it can persist for  macroscopic systems and will survive even in the thermodynamical  limit. In this section we discuss how it  behaves at finite temperature of thermal entanglement. The states in N-spin system describing a system in thermal  equilibrium states, are determined by the Generalized  spin-Hamiltonian and thermal density matrix Ï (T) = exp(−Hspin/kT) Z(HZ) (15) where Z(HZ) is the partition function of the N-spin system. The thermal entanglement is Q(à Ã‚ µ, T,HZ) = 1 − 2Δ2 Ï€2NZ(HZ)2 ÃŽ £N _=1 |c_|2 exp[−à Ã‚ µ_/kT] (à Ã‚ µ − à Ã‚ µ_)2 + Δ2 Ãâ€" (16) ÃŽ £N _=_+1 |c_|2 exp[−à Ã‚ µ_/kT] (à Ã‚ µ − à Ã‚ µ_)2 + Δ2 The demonstration of quantum entanglement, however,  can also be directly derived from experiments, without  requiring knowledge of the system state. This can be  done by using specific operators–the so-called entanglement  witnesses–whose expectation value is always positive  if the state Ï  is factorizable. It is quite remarkable  that some of these entanglement witnesses coincide  with well-known magnetic observables, such as energy  or magnetic susceptibility χ = dM/dB. In particular,  the magnetic susceptibility of N spins s, averaged over  three orthogonal spatial directions, is always larger than  a threshold value if their equilibrium state Ï  is factorizable: ÃŽ £ g χg > Ns/kBT [EW]. This should not be surprising,  since magnetic susceptibility is proportional to  the variance of the magnetization, and thus it may actually  quantify spin.spin correlation. The advantage in  the use of this criterion consists in the fact that it does  not require knowledge of the system Hamiltonian, provided  that this commutes with the Zeeman terms corresponding  to the three orthogonal orientations of the  magnetic field ÃŽ ± = x, y, z. As already mentioned, in  the case of the Cr3 trimer, the effective Hamiltonian includes,  besides the dominant Heisenberg interaction J ∠¼118 meV , smaller anisotropic terms G ∠¼ 1.1 meV and  D ∠¼ 0.18 meV , due to which the above commutation relations  are not fulfilled. This might, in principle, result in  differences between the magnetic susceptibility and the  entanglement witness WE (see Fig.). Apparently, the  difference is quite essential and therefore it is necessary to use a formula for global entanglement Q(ψ) in N-spin  system. 4 10−1 100 101 102 103 0 0.005 0.01 0.015 0.02 0.025 0.03 0.035 0.04 0.045 The calculated difference à ¯Ã¢â‚¬Å¡Ã‚ ½EW(T)−EWa(T)à ¯Ã¢â‚¬Å¡Ã‚ ½/EW(T)for Cr3 isosceles trimer T(K) à ¯Ã¢â‚¬Å¡Ã‚ ½EW(T)−EWa(T)à ¯Ã¢â‚¬Å¡Ã‚ ½/EW(T) FIG. 1: (Color online) The calculated difference j EW(T) à ´Ã¢â€š ¬Ã¢â€š ¬Ã¢â€š ¬ EWa(T) j =EW(T) for Cr3 isosceles trimer 0 100 200 300 400 0 2 4 6 0 0.2 0.4 0.6 0.8 1 1.2 Angle(Degrees) The calculated M(H) for Cr3 isosceles trimer H(T) M(à ¯Ã†â€™Ã‚ ¬B) FIG. 2: (Color online)Magnetization M(H) of the Cr3  isoscales trimer on metal surface as a function of angles from 0 to 360 degree C. Thermal global entanglement in static magnetic _eld 5 0 50 100 150 200 250 300 350 400 0 0.05 0.1 0.15 0.2 0.25 The calculated variation of M(H) vs angle (magnetization switching) Angle(Degrees) M(à ¯Ã†â€™Ã‚ ¬B) 0.1Ts 0.2Ts 0.5Ts 1.0Ts FIG. 3: (Color online)The calculated variation of M(H) vs  angle (magnetization switching) for Cr3 isoscales trimer   FIG. 4: (Color online)The calculated density of global entanglement  vs temperature and energy for Cr3 isoscales trimer 6 0 100 200 300 400 0 2 4 6 0 0.5 1 1.5 2 2.5 Angle(Degrees) The calculated M(H) for Cr3 molecular magnet H(T) M(à ¯Ã†â€™Ã‚ ¬B) FIG. 5: (Color online)Magnetization M(H) of the Cr3 molecular  magnet as a function of angles from 0 to 360 degree 0 50 100 150 200 250 300 350 400 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 The calculated variation of M(H) vs angle (magnetization switching) Angle(Degrees) M(à ¯Ã†â€™Ã‚ ¬B) 0.1Ts 0.2Ts 0.5Ts 1.0Ts FIG. 6: (Color online)The calculated variation of M(H) vs  angle (magnetization switching) for Cr3 molecular magnet 7 FIG. 7: (Color online)The calculated density of global entanglement  vs temperature and energy for Cr3 molecular magnet  FIG. 8: (Color online)The calculated entanglement for the  Cr3 isoscales trimer as a function of temperature and the  magnitude of the magnetic field Hpar. 8 FIG. 9: (Color online)The calculated entanglement for the  Cr3 isoscales trimer as a function of temperature and the  magnitude of the magnetic field Hper. FIG. 10: (Color online)The calculated entanglement for the  Cr3 isoscales trimer as a function of temperature and the magnitude  of the magnetic field Hav. 9 FIG. 11: (Color online)The calculated entanglement for the  Cr3 molecular magnet as a function of temperature and the  magnitude of the magnetic field Hav.