Find the separation between two cones of the same type on the fovea of the eye by using the resolving power of the eye Essay Example Essay Example

Find the separation between two cones of the same type on the fovea of the eye by using the resolving power of the eye Essay Example Paper Find the separation between two cones of the same type on the fovea of the eye by using the resolving power of the eye Essay Introduction Objective: Find the separation between two cones of the same type on the fovea of the eye by using the resolving power of the eye. Introduction: The retina contains two types of light detecting cells: rods and cones. Cones provide the eye’s colour sensitivity, rods, though more sensitive than cones do not detect colour. There is an area on the retina with a much higher density of cones called the fovea. When an object is observed its image is focused on the fovea. The fovea is a 0.3mm diameter area containing on rods and very thin densely packed cones. Cones can be divided into three types; one type detects each of red, green and blue light. The green and red cones are concentrated in the fovea centralis. Find the separation between two cones of the same type on the fovea of the eye by using the resolving power of the eye Essay Body Paragraphs To measure the separation between two cones in the eye we can use the resolving power of the eye, for two objects to be resolved optically the viewer must be able to clearly differentiate two distinct bodies. (Rayleigh’s criterion:? =?/d) Critical case shown where objects are just resolved For two light sources of the same wavelength to be resolved the light must stimulate two cones on either side of one unstimulated cone. Resolving power due to a circular aperture can be calculated by:? = 1.22? d Where:? = resolving power of optical instrument? = Wavelength of light d = diameter of aperture The resolving power of the eye will not be as high as this calculated theoretical resolving power as although the optical equipment of the eye may be of this power the eye’s detection facilities give the brain discreet not continuous signals and so the actual resolving power of the eye will never reach this theoretical value even if the optical facilities of the eye are perfect. As a result we must calculate the separation between two cones using:? = s Where: s = separation r r = distance Plan: Factors identified affecting the experiment: The separation of the two light sources. I will vary this to produce a range of distances from which the objects can be resolved. The perpendicular distance that the viewer of the light sources can be from them and still completely resolve them. This will vary as a direct result of changes to the separation of the light sources. The size and shape of the light sources. I will control this by shining the light through measured apertures made in black acrylic. I will control the size of the apertures by using a 1mm drill bit to create the holes through which the light sources will be shone, this will also ensure the sources are of a constant shape. The amount of light that is reflected. I will use a black background surrounding the light sources to ensure that only a minimal amount of light is reflected. The brightness of the two light sources must be equal to each other, I will achieve this by connecting the light sources in series to the same power source. The brightness of the light sources must be constant as it is easier to resolve brighter objects. I will control this factor by keeping the voltage of the power source constant. The wavelength of light must be kept constant by using the same equipment (same L.E.D.s) for each repeat of the experiment. This must be controlled as different colours of light stimulate different cones on the retina and also the wavelength of light affects the calculated value for the resolving power of the eye. The height of the eye relative to the light sources must be constant and perpendicular. This will be controlled by having the light sources at a height of 1 metre and having the viewer use a metre ruler as a guide to the height of their eyes when resolving the light sources. The size of the eye and the strength of eyesight must be constant throughout the exp eriment. This will be achieved by using the same observer throughout the procedure and carrying out the procedure in a single session. The brightness of the environment must be constant. This will be kept constant by carrying the experiment out in a single session. Also the environment will be kept as dark as possible to maximise the resolving power of the eye and so optimise the accuracy of the results. The diameter of the pupil must be kept constant and as large as possible to allow as much light into the eye as possible. This will be kept constant as a direct result of controlling the brightness of the environment. (Variation of 1mm to 10mm possible.) Method: Set up the apparatus as shown in the previous diagram, switch on the power pack at 3.00v. Turn off the lights in the room and block out daylight coming from any windows or doors. Allow 2 minutes for the eyes to adjust to this darkness and do not allow any light into the room from this point up until the end of the procedur e. The viewer of the lights must then stand on the masking tape and back away from the light sources following the masking tape using a metre ruler as a guide to the height of their eyes. The viewer must back away until they are at the point where they can just resolve the two light sources. This point must then be marked on the masking tape using the metre ruler as a guide. Repeat the experiment for this separation three times to obtain a reliable result and eliminate any anomalous results. Three is enough results to obtain a good average result as long as all the results are relatively close together. Remove the acrylic and replace with another piece of acrylic with holes of different separations and repeat the above procedure. 5 different separations must be used as six results are sufficient to plot a straight-line graph and the sixth result can be 0,0. Less results than this may not produce an accurate gradient and more results would be surplus to requirements. When the experim ent is completed measure the marks recorded on the tape for distances and then calculate an average distance for each separation. Plot a line graph of separation against average distance. The graph is plotted to produce a gradient to obtain a value for the resolving power of the eye the graph will reduce any overall errors in the experiment. Separation of apertures is to be measured with a travelling microscope accurate to?0.005mm, this measuring equipment is to be used as it is the most accurate available to me in the lab and so will reduce the errors in my results by as much as possible. The other measurement to be taken is the distance from the objects from whence they can be resolved. This is to be measured using a measuring tape accurate to?0.5cm this is sufficiently accurate as it is a very small error compared to the overall distance and so will not detract significantly from the accuracy of my results. When the results have been taken the calculation shown overleaf will be u sed to calculate the separation of two cones on the fovea. Safety: Electrical equipment must be used with care and it must be ensured that no water is brought into contact with it. Care must be taken whilst carrying out a procedure in a darkened room, ensure all sharp corners and protruding objects are cleared. Calculation: Equation 1:? = s R? = resolving power of the eye in radians s = separation of apertures r = Distance away from light sources when resolving is just possible Equation 2: s’ = r’? s’ = separation of 3 cones r’ = radius of the eye? = resolving power in radians Separation between two cones = s’ 2 Theoretical? = 1.22? D? = wavelength of light D = Diameter of pupil Assumptions: Assume pupil size is constant Assume diameter of the eye is 26mm Assume no aberrations of the eye Assume room is pitch black Assume L.E.D.s are of constant brightness Assume apertures are spherical Assume all eyes work the same Assume average green wave length Assume only one wavelength from L.E.D. Assume pupil size is constant Assume light source is perpendicular Assume light crosses at the centre of the eye Assume cones are all of equal size and shape. We can assume this as cones are densely packed in the fovea Assume refraction at the entrance to the eye is zero. We can assume this as distance r is relatively large compared to the separation of the light sources so we can assume that the light entering the eye is perpendicular to the lens. As a result we can assume similar triangles: Test: I carried out a preliminary experiment using this procedure and found the separation of two cones to be 3.57?10-4m. As this is a factor of 10 away from the literature value for separation I will now alter my procedure by increasing the voltage of the power pack to 6.00v to increase the brightness of the L.E.D.s and so optimise the resolving power of the eye. I will test the accuracy of my results by carrying out the experiment in a brigh t room, resolving two black objects of a similar size to the apertures used in my procedure. Resolving power in this situation should be less than resolving power calculated in the results. Conclusion:? = s = gradient = 3.125?10-4 r Separation of cones = r r = 1.3?10-2 = 4.062?10-6m = separation between 3 cones?2 = 2.03?10-6m = separation between 2 cones Errors: This value is appropriate but it must be taken into account that the following errors will affect the final value: Equipment Tape measure accurate to? 0.01m 0.05? 100 = 3.13% Use of tape measure accurate to? 0.05m 1.60 Travelling microscope accurate to? 0.01?10-3m 0.01?10-3m? 100 = 2.27% Use of travelling microscope: error as above. 0.44?10-3m Other errors Assumption that the eye is 1.3?10-2 radius is a statistical average value and so may vary considerably. Refracted angle is negligible is an assumption which will affect the accuracy of the results as using this assumption we can use similar triangles to calculate the separ ation of two cones. Given these errors be taken into account my value is close enough to the literature value for the separation of two cones to confirm that my procedure was valid. 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Education in Sudan

Education in Sudan Free Online Research Papers Representation of the Sudans Education A work of literature can not be separated from the context in it occurred. The context of the work of literature includes two main dimensions: the dimension of time and the dimension of space (place). Season of Migration to the North takes place in the first half of the last century on Sudan. Some of the incidents occurred during the period on which the narrator or Mustafa Saeed were outside their homeland living in England .The novel reflects the actual historical facts about Sudans education in that period Education is crucial in any type of society for the preservation of the lives of its members and the maintenance of the social structure (Rodeny ,et.al,†¦. ). Education is a crucial aspect for the life of any nation as it is the case for the Sudanese. The importance of education came from the fact that its influence is huge on many different aspects of the Sudanese life. Im going to cover this crucial aspect of life by the analysis which will depend mainly on what it was mentioned about education within the text of Season of Migration to the North† and I will connect these indications about the status of education in Sudan with the real information which we get from history books. During the first half of the twentieth century, educational institutions were, for the first time, introduced by the colonial power (England) to the Sudanese culture. Apparently, the population of Sudan who was not acquainted to the colonial educational system (a system that served the colonial power’ plans) did not perceive the idea easily. The people feared sending their own children to schools as was explicitly mentioned in p.20of the novel: That was the time when we first had schools. I remember now that the people were not keen about them and so the government would send its officials to scour the villages and tribal communities while the people hide their sons. They thought of schools as being a great evil that had come to them with the armies of occupation The colonial schools system was originally introduced to Sudan for the purpose of training Sudanese to participate in the domination and the exploitation of their own nation, for the purpose of creating inferiority complex, and of creating confusion. The main purpose of colonial system was to train Africans to participate in the domination and exploitation of the continent as a whole. Colonial education was education for subordination, exploitation the creation of mental confusion and the development of underdevelopment (Rodeny,et.al,†¦.) The colonial educational system was involved in creating an alienated Sudanese class in their own homeland In Rodeny ,Corbal and Ngugi as guides to Africa post colonial literature ,we were told that the most alienated in Africa were the educated Africans The educated Africans were the most alienated Africans on the continent. At each further stage of education, they were buttered and succumbed to the white capitalist system, and after being given salaries they could then afford to sustain a style imported from outside.. That further transformed their mentality. One may think of the reasons that made these educated African alienated from their society, about their role in the development of their underdeveloped country and their loyalty †¦Ã¢â‚¬ ¦etc. The first reason for being alienated from Sudanese is properly the role that the educated Sudanese class played during the English occupation .The graduates of Gordon collage , which was very much like intermediate school ,were the junior government officials such as mamours†¦etc. The English commissioner gave them orders to bring in the taxes from their kinsmen. They had to opay the orders; otherwise, they will lose their jobs or they will be punished for the accuses of inflammation of mutiny against England control over Sudan. The ignorant Sudanese were so exploited to the degree that they hated their Sudanese brothers and loved the English commissioner who pretended to be full of mercy and pity .The English commissioner pretended to behave in that merciful way to avoid the fate of the previous English commissioner in Sudan who was assassinated by the patriot Sudanese . The educated were thought to be the one who exploited the nation. Secondly, the educated were alienated from the society because of their hypridity. They have a culture of their own. Their culture of inbetweenness includes both the features from the Sudanese and European cultures .They were living in the third space. Both of the narrator and Mustafa saeed can be considered alien to the people of the village. They were different in certain ways. For Mustafa Sa’eed, he was alien to the village in the literal sense of the word since he has no root in the village. The villagers knew very little about him as appears when the narrator asked his friend and his grandfather about Saeed. Their answer was that he was from Alkhortoum and he settled in the village five years ago and married Mahmoud daughter four years ago and his behaviors caused no harm. These information is so few to the degree that when you know such information about a person you actually do not know him or her .The more important aspect of his alienation is on the intell ectual level .His way of perceiving the world is different from the way the society does . This appears in many of his actions during his residence in the village such as his relation with his wife Husna, he did not treat her in the same way other men in the village did with their own wives .He acknowledged her rights to think, to be independent and to have a voice .This was never done or accepted in the village society. He also seems to be alien when he cared about giving excuses for coming to visit the narrator at noon .In the village culture ,visiting your neighbors in any time of the day ,even if it is the noon or the middle of the night or the early mourning ,is accepted without bothering yourself of making excuse. . The narrator is also alien in his way of thinking, such as his refusal to acknowledge Husna marriage to Wad Rayes while the whole population of that village accepted this marriage as a normal thing to happen. He gave Husna an excuse for her deed, but the whole society considered her deed as a shameful deed of a female done in the history of the peaceful village. The most important reason for being alienated from the Society is the fact that these educated people where greatly influenced by the education they received from the colonial school system to the degree that they believed firmly in the ideas and the believes of colonialism. The influence of the colonial educational system continued after the end of colonialism. The educated retained the ideologies, the believes and the attitudes of colonialism while ruling their homeland. We can no longer consider Sudan as independent state even after the end of military colonialism since the colonial power ruled it by the black masked faces who carried in their minds the white thoughts and believes .The colonial power left the native land but still its control of the land continued . This was stated directly in the conversation between the narrator and the retired Mamour PP52-53. The people would gumble and complain to the English commissioner ,and naturally it was the English commissioner who was indulgent and showed mercy . And in this way they sowed hatred in the hearts of the people for us , their kinsmen ,and love for the colonizers , the intruders †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ Have we not become independent? Have we not become free men in our country ?Be sure ,though that they will direct our affairs from a far . This is because they left behind them people who think as they do †¦.It was the nobodies who had the best jobs in the days of the English ? The graduates from the intermediate school , specifically Gordon collage ,played a marginal role if they played any role at all in the social aspect of life , their role was merely writing essays from time to time in wall newspapers or delivering speeches in certain religious and social occasions such as the memory of the birthday of the prophet _peace be upon Him _ †¦etc or making discussions of literature in their homes and clubs taking on their consideration the fear of authority and its intensive pressure upon them . . ? . . ?345. ( ,.). If this was the case with the graduates of Gordon collage, what was the case for the graduates of the universities of Egypt, England, Lebanon†¦.etc ? The status of these graduates from foreign universities was not better than their kinsmen, the graduates of Gordon collage. They were unfortunately deprived from the most crucial thing which would probably help them to develop their homeland if they were allowed to have it .They were deprived from having a voice to oppose the corrupted orders of those in higher positions like ministers . We find the narrator telling his friend Mahjoub that: A civil servant like me can not change anything if our masters say do so _and _so we do it† It seems that its neither the educated Sudanese from villages who occupy jobs in governmental offices, nor these who are graduates of intermediate schools, nor those who graduated from primary schools were able to make the change. The question that asks itself is who is the one that has the ability to make the change, and to bring the development to the country if the educated themselves were not able to bring the change to the corrupt systems that dominate Sudan .? Is the party (the Nationalist Democratic Socialist Party) going to bring the change to the country ? When we continue reading through the same page ,we will find the answer which is negative . The party is also handicapped .Its not able to make schools nor hospitals, which are the most crucial basic infrastructure in any society .Then, what is the benefit of having a party that does not work or not able to bring development to the country . You are the head of the national democratic socialist party the party in power, so why not pour out your anger on them Mahjoub said apologetically , if it had not been for the calamities. on the day it happened we were preparing to travel in a large hospital also an intermediate boys school ,a primary school for girls , an agriculture schools and. The above quotation refers to a very important historical fact which is the lack of schools in Sudan and the centerization of schools in the main cities like Al Khartoum, Omdarman. The educated and the socialist party wanted to develop the country by developing the education system, so we find their calls to develop educational system and to build new schools in Sudan especially in villages. Mahjoub informed us about the intention of the village delegation to ask for a primary school for girls since there is non, and a secondary school for boys and a primary school for girls, this indicates that there was a primary school for boys in the small village .During the 1930s, there were only ten schools in Sudan which is a spacious country .How many students do these schools teach? Perhaps five thousands or even ten thousand students are taught in these schools and what about the rest of the nation? For sure they will be left ignorant with no education .What will be the fate of a nation with little education? The other problem which Sudan suffers from as any other underdeveloped country was the centerization of infrastructure in the main big cities especially educational institutions and the lack of these institutions in the small villages in al khourtoum and Oumdarman, the old and the new capitals of Sudan, the educational institutions are available, but in small villages ,there were no such institutions the thing that made many students walk long distance to reach the nearest school since by now you probably realize the fact that the one ( e.g. corrupted governmental officers) who is not eager to provide villages with schools is ,for sure, not eager to provide the children with transportation methods (buses cars , trains †¦.) The problem was not peculiar to the quantity of education but also to the quality of the needed education. What kind of education does Sudan need in that period of time? The answer for this question may be directly indicated by the response of Mustafa Saeed to the narrator when the later informed Mustafa Saeed that he learned English poetry during his study period in England, not engineering nor medical sciences †¦We find that Saeed was at first disappointed but later he admitted the fact that Sudan in need of any kind of education not a specific study only as indicated below: We have no need of poetry here .It would have been better if you’d studied agriculture, engineering, or medicine But we are farmers and think only of what concern us Knowledge of whatever kind is necessary for the advancement of our country This disappointment of Mustafa saeed is due to the fact that he was properly worrying about the coming destiny of the Sudan and its nation. He realized the nation’ intensive needs for agriculture, engineering and medical knowledge and he was hopping that this need would be reduced a little by the narrator, but he was greatly disappointed when he knew that the narrator studied poetry. He, as scholar in economics, did not realize the influence of poetry on the self, the only thing that matters to him is statistics, numbers He few minutes later realizes the fact that the country needed any kind of knowledge even poetry. Agricultural schools were so important and so valuable since the Sudanese were living on farming not trade nor manufacturing ,so we find Mahjoub saying that the delegation they were preparing to send in order to demand of the party who is in power or perhaps of the government directly their needs of schools and hospitals . The last thing that we can say about education as represented in Season of Migration of the North is the ideas of rulers of Sudan about the situation and their way of behaving .The ideas of the rulers of Sudan appear clearly on the education conference. They started taking of unifying curriculum even though the schools were not built yet.!!! They say: no contradiction must occur between what the student learns at school and between what the reality of the life of the people. He justifies the fact that no schools were built as away of preventing a bourgeoisie from being created but the bourgeoisie is already created .It is living far away from reality and he is one of its member . This person, who does not want to make the students feel the difference between their schools and reality, escapes the hot summer of Sudan to live in his villa in Europe. His wife also does her shopping in Europe Yet he justifies the lack of good schools by fearing of creating a remoted away bourgeoisie . All in all, the Sudanese did not accept the educational colonial system .This system was intending to exploit the society by creating an alienated class of Sudanese. The corrupted government officials also exploit the nation by controlling the nation resources. The education is a crucial aspect of the life of any nation therefore the education should be improved to bring in the development for the nation in all respects of life. References : †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.,Rodney .et.al .Guides to African post colonial literature.F-M . omoregie . English Department. University of Boston . www.thecore . nus.edu.sg/post/Africa/omeiogie 11.htm#wrz . , . . ? ? .1924-1989? .1342-1409? . . Research Papers on Education in SudanStandardized TestingBringing Democracy to AfricaInfluences of Socio-Economic Status of Married MalesPETSTEL analysis of IndiaRelationship between Media Coverage and Social andAssess the importance of Nationalism 1815-1850 EuropeResearch Process Part OneHip-Hop is ArtQuebec and CanadaBionic Assembly System: A New Concept of Self

Income determination Essay Example | Topics and Well Written Essays - 1500 words - 1

Income determination - Essay Example ucts.2 Though there has no other research on the study of income smoothening Greenawalt and Sinkey study has helped Bank Company to provide income smoothening to loans to avoid losses that result from loan defaulters and bad debt.3 Greenawalt and Sinkey wonder why managers would want to smooth accounting incomes using loan loss provisions.4 This makes sense as it enables businesses to balance out the income when there is a boom and for the time businesses experience burst or recession. The two author provide a regression analysis data that have an R2 value of more than 0.5%.5 Therefore, the authors provide evidence into the use and success of income smoothening among large banks. Busch and Kick examine the determinant of noninterest earnings and their effect on financial risk and performance in Germany.6 Busch and Kick find out that almost all bank that exercised risk adjustment returns on its loans had positive higher income activities.7 Moreover, their study contributes empirical evidence that bank that involved in fee generating activities do so with high risk. The authors postulate that only in risking in noninterest activities that commercial bank remain relevant in the market.8 Busch and Kick argue that the increased demand for noninterest goods and services prompt bank to abandon the traditional sources of income due to the advent of new technology in communication and other areas in the economy.9 Busch and Kick proved that the noninterest activities are generating more income for the bank more than the interest-based activities.10 For this reason, the authors are advocating commercial bank to embrace the noninterest generating activities fully becaus e they bring more income and also because they have a high demand in the market. Keynes in his analysis of income determination of a country hypothesised that income is subject to fluctuation and is characterised by boom and busts.11 He questions the classical economist theories for failing to provide an

Analytical and synthetic cubism Essay Example | Topics and Well Written Essays - 1000 words

Analytical and synthetic cubism - Essay Example Cubism was founded by Pablo Picasso and Georges Braque, inspired by the artworks in African Sculpture, by painters Paul Cà ©zanne (French, 1839-1906) and Georges Seurat (French, 1859-1891), and by Fauves. Cubism was later divided into two branches, Analytical Cubism and Synthetic Cubism.Analytical Cubism is the first development phase of Cubism and was developed between 1908 and 1912. The Analytical phase consisted of analyzing the object and then breaking it down into basic geometric forms in the canvas.Synthetic Cubism, the second and more decorative phase of Cubism started after the Analytical phase in 1912. This phase was less complex than its predecessor phase.During Analytical Cubism the language of Cubism had become flatter, consistent, but also more ambiguous. In his portrait of Ambroise Vollard, Picasso fragmented a human figure into a number transparent geometric planes intersecting each other at a variety of angles, none of these planes giving the illusion of three dimens ionality.2 In this work, Picasso merged figure and environment, solid and void, background and foreground.â€Å"Synthetic Cubism was in part a reaction against the abstract tendency of the Analytical phase.†3 With his `Still Life with Chair Caning’ (1912, Musà ©e Picasso,Paris, France) Picasso invented a technique called collage (from the French word `coller’ meaning "to glue"). This started the second phase of Cubism known as Synthetic Cubism. Pasting pieces of paper or other material to the surface of painting is Collage. In his painting, Picasso used a piece of oilcloth. Soon both Picasso and Braque began using newspapers, wallpapers, advertising in their paintings implying that art can be created with anything and not just brushes and paint.2 During Analytical Cubism, the works produced by Picasso and Braque shared similarities in style since the objects were represented by geometric forms such as cylinder, sphere and cone. Whereas Synthetic Cubism was more like synthesizing several objects into a figure. The colors were minimum or almost non-existent in Analytical Cubism paintings. Many of the painting were entirely muted brown or grays. The main reason for this was that the two artists were concerned about geometric shapes. Synthetic Cubism on the other hand is more of a decorative phase of Cubism. Colors were reintroduced in synthetic cubism. For the decorative effort, bright colors were used, smooth and rough surfaces were contrasted with one another. Sometimes objects such as newspapers or tobacco wrappers were used in combination with painted areas.4 Abstraction was one of the main characteristics of Analytical Cubism. There was minimal resemblance with the real world as can be seen in the paintings 'Ma Jolie' (1911) by Picasso and 'The Portuguese' (1911) by Braque. The subject matter appeared to be structure of fragmented planes. In Synthetic Cubism both artists included stenciled letters, words (often pun) as a reaction against abstraction of Analytical Cubism.3 Right angles and straight-lines were mostly used in Analytical Cubism. Paintings were almost flat though sometimes in some areas the painting appeared sculptural, for instance in the painting Girl with a Mandoline' (1910), by Picasso. The synthetic phase of Cubism affirmed Cubism as a manipulative technique which plays games with both reality and perception, through the use of collage and letter stenciling. It also helped in accentuating its flatness. Picasso began to look at sculptures in a new way, due to his experience with collage, as an assemblage of parts rather than a shaped mass, which shows in the sculptures he made in 1912, riffs on the form of the guitar. Cubism as Modern Movement: Cubism is considered to be the most influential modern movement by many art critics. The reason being that Cubism gave a new meaning to looking at objects in a significantly different way from the one set during the Renaissance

African American Culture withing the NYPD Essay

African American Culture withing the NYPD - Essay Example There are various aspects that can be discussed about NYPD and this piece of work focuses on the culture within this police department with much emphasis being given to the African American culture and how it is portrayed within the police department1. Culture is basically a way of life of people and how people interact or relate with one another based on their different backgrounds in terms of race, ethnicity, nationality, beliefs and values, religion, language among other aspects that define a person or community. African American culture entails the cultural aspects or contributions of the Americans that are of African origin to the overall culture in the United States, which could be witnessed either as distinctive or as an integral part of the American culture. The African American culture is an aspect that has got its origin in Africa has had a substantial influence on the American culture through the assimilation of various cultural values most of which are beneficial. Cultural differences among people has been linked with differences in how people treat one another and this is also evident within the New York city police department where there is a very great difference in how the African Americans are treated as compared to people of other races. This, for example, can be seen in the ranking within the department among other issues in regard to general treatment where they are even accused falsely and treated in an inhumane manner to an extent of being killed illegally. The African American culture has been experienced in different ways within the NYPD. A good example is that concerning the music industry specifically rap and hip-hop. New York has been known as the capital of hip hop which has created the hip hop generation. The African American culture has facilitated the use of the hip hop music to perpetrate many aspects some of them being political in nature making it a point of concern to the New Yolk

Recognition of Facial Emotions Using LDN Pattern

Recognition of Facial Emotions Using LDN Pattern RECOGNITION OF FACIAL EMOTIONS USING LDN PATTERN P. Ajay Kumar Reddy1, Dr S.G Hiremath2, Dr M.N GiriPrasad3, Dr G.N Kodanda Ramaiah4 1Research Scholar, Dept of ECE, KEC/JNTUA, Kuppam,A.P,India. 3Professor, Dept of ECE, JNTU,Ananthapuramu ,A.P,India. 2,4Professor, Dept of ECE, Kuppam Engineering College, Kuppam,A.P,India. Abstract A novel LDN pattern is proposed for facial expression recognition. LDN extracts the local features from a face which is used for face analysis and facial expression recognition. It computes the directional data of face textures into a compact code. Here compass masks are used to find the directional data which helps in distinguishing the homogenous structural patterns which helps in evaluating intensity variations. Experimental results show that the LDN method provides better results with reasonably low error rates. Keywords LDN pattern, Local Directional number pattern, feature vectors, expression recognition, face descriptor, face recognition, feature, image descriptor, local pattern. à ¯Ã‚ »Ã‚ ¿ Face recognition is widely accepted for image analysis and pattern recognition. Its significance has increased in the last decade because of its application in commercial and law enforcement. Although a plethora of research was carried to overcome the disadvantages of facial recognition system but still a lot of problems persist. The most challenging work in any facial expression recognition system is to find the face vector. The aim of identifying a face vector is to find an efficient way of representing facial images which provides robustness in recognition process. There are two approaches proposed to extract facial features in any expression recognition system. Geometric feature based Appearance based method In geometric feature method, the location and shape of different facial features are combined to form a feature vector which represents a face, whereas in appearance-based system applies image filters on whole face or some specific regions of face to extract expression changes in face image. Geometric feature method requires reliable facial features which is a hurdle to accustom in lot of situations. On the other hand, performance of appearance-based methods is degraded due to environmental variations. The proposed LDN method will robustly identify the facial expressions under various variations like sad, anger, happy, disgust, etc. à ¯Ã‚ »Ã‚ ¿ There are several techniques used in holistic class like fisherfaces and eigenfaces which are developed on PCA method. Although they are widely used their limitations to illumination and variations in poses causes a great concern in facial recognition system. Kotsia et al. [2] proposed an expression recognition system in sequences of facial images. Heisele et al. discussed about the legitimacy of the component-based methods. They expressed the face into one descriptor by extracting and computing local features from different parts of face. Zhang et al.[3] used the higher order local derivatives to get better results than LBP method. In order to overcome illumination variations and noise problems they used other information rather than depending on intensity levels. Donato et al. done a comprehensive analysis on different algorithms like LFA, PCA, Gabor wavelets, ICA to represent face images for facial expression recognition. Among them Gabor wavelet and ICA achieved the best performance. Shan c et al. presented robust LBP as feature descriptor in facial expression recognition. Though LBP is efficient in computations and robust to monotonic illumination change, its performance degrades in presence of random noise. The proposed framework for facial expression recognition is as described below. In the first stage a trained dataset is created with several facial expressions like fear, anger, sad, joy, happy, disgust etc. several preprocessing techniques are applied on these images. Then various features are extracted from face and its edges are perceived using Gaussian derivative and Kirsch masking. These features are classified and normalized using SVM classifiers. When a test image is given for recognition it is compared to the dataset and accurate images are recognized. Finally all the test results obtained are analyzed. Figure:1 Block Diagram Of LDN LDN Framework: The LDN pattern is a binary code of 6 bits assigned to each pixel of an input face image that represents the texture structures and transitions in intensity levels. The existing technique reveals that the edge magnitudes are not sensitive to lighting variations. Here we generate a pattern by using a compass mask which computes the neighborhood edge responses by utilizing the positive and negative values of those edge responses. A valuable data of the neighborhood structure is provided by the positive and negative values. These values reveal the gradient direction if the bright and dark areas in the neighborhood. The information of the neighborhood structure is provided by the positive and negative responses because the disclose the gradient path of bright and dark areas in neighborhood. The LDN generates a 6bit code every instance whenever the positive and negative responses are swapped. By using a compass mask we can compute the threshold responses in the neighborhood in 8 different directions which helps in generating a semantic descriptor for numerous textures with uniform structural pattern. Dataset The dataset images which are used for the research work are lively recorded which depict various facial expressions like anger, joy, disgust, sad, fear and happiness. Figure:2 Dataset Pre-Processing Different processing techniques are used on input images. Here kirsch masking is used for calculating edge responses. It basically extracts response in edges and rotates 45 degrees apart to obtain mask in 8 directions. A derivative Gaussian mask is used to smooth the code which helps in overcoming the illumination changes and noise. This helps in getting strong edge responses. Code Generations: LDN code is generated by analyzing each edge response of mask in its ( M0M7), particular direction. The noticeable darker and brighter areas are indicated by the highest positive and negative values. The noticeable darker and brighter regions are encoded based on the sign information. The positive directional number is coded as MSB of the code and the 3 LSB bits are negative directional numbers The LDN code is represented as, LDN(x, y) = 8ix,y+ jx,y(1) Where, (x, y) is coded central pixel of neighbourhood., ix,y is maximum positive response directional number, jx,y is maximum negative response directional number Classifier: SVM classifier is used to recognize the facial expressions and it also increases the accuracy of the facial expression recognition. It is used to calculate the perrformance of LDN method. It not only used for data mapping but it helps in making the binary decision. The proposed LDN method used directional numbers which helps in encoding the structure of face textures in efficient manner.it produces a compact code by using the sign information that is more reliable against noise, to encode dissimilar patterns of face textures. The compass masks used gives better results in obtaining the edge responses and smothen the code to overcome illumination variations. When compared with LBP and LDiP the LDN recognition rate is better in presence of noise and illumination changes.

Computers in my Life :: Personal Narrative Writing

Computers in my Life Fun, relaxation, money, can you get all that with only one tool? The answer is yes. What is the name of that magical instrument? Technology's greatest invention, Computers. They are sophisticated equipment that performs three main tasks: accept structured input, process it according to prescribed rules and produce a result as output. They come in a remarkable rage of sizes and shapes, and have different abilities and application. They can be a bunch of equipment with little or not use, or a powerful instrument if you know how to use it. They play a very important role in every American's life, specially mine. In today's society, computers are necessary; they are used in all kinds of jobs. They are used in Science fields like Math and Medicine, but they are also used in fields like mechanics. Imagine, even for someone that fix cars a computer is necessary. Computers have a very respected place in our world today; new generations are using them for everything: to learn, to commun icate, to do research, etc., and old generations have become to accept them as well; even though they always reject any changes. Anyway there are people that while reading this essay thinks: "I do not see it; I really do not understand how can computers be so useful and how?" Oh! Well. In my special case, computers are more than a simple tool; my life changed since the first moment they came into it. They turn my mind around completely; it was like a perfect match. Since the first time I sat in one, I knew they will become an undeniable part of my life. It has been five years since then and I my opinion remains the same. I have in fact discovered many more uses for them. Three of those uses are: a method of relaxation, a tool to work and very practical and a useful instrument that makes my life easier. First, computers are my best method of relaxation when my stress is maximum. They provide me with entertainment; for example, when I use a graphic program like Paintbrush to create a design, or when I use a word processor like Microsoft Word to create a sign I want to put in my room. I can get very creative and even design posters, conniving words and pictures, that later I can use to decorate my room.

Police officer essay Essay

Every person has his own dream or ambition in life. Someone wants to become a soldier, someone a doctor, some an engineer or a politician and so on. Some others aspire for the careers of authors, actors or singers. But my ambition is to become a police officer in my future life. In the drill class in my school, I was very serious, and always tried to follow and learn the rules of parade as perfectly as possible because I wanted to become a member of the police force. A police officer, as far as I know, has to be disciplined, honest and maintain the law and order in the society. He is also expected to possess an attitude of help and rescue towards the deserving cases with a selfless mind. When I grow and become a police officer, my motto will be to serve the society with an impartial attitude by saving the distressed persons and punishing the culprits. I will definitely try to infuse the sense of duty and an essence of discipline into the minds of the common man in the society. I promise not to misuse my power and soil my hands with the dust of corruption. I shall obey my superiors and give protection to my subordinate staff. That is how I shall try to prove myself as a perfect police officer. My father is a senior officer in the police force. He is an ideal example before my eyes. I want to follow his footsteps in my future life.

Biology Dissertation The Key Points to Consider When Writing

Biology Dissertation The Key Points to Consider When Writing One of the most challenging academic tasks is to write a dissertation. It is very complex, and you should be fully engaged in the process of writing. It becomes even more complex if the problem is difficult or not interesting to you. Thus, it is quite important to choose the topic you like. A biology dissertation may be a bit troublesome. Nonetheless, if you have a good command of the discipline and know how to compose it properly, you will definitely achieve success. Here are some essential prompts on how to complete all stages of your dissertation in biology: Write the title page. It should contain the dissertation title, the name of a researcher, the main reasons for submission of the project, the name of the educational institution, department’s name, the month and year of publishing. This is a special page, which contains your appreciation to those people who helped you to compose your research in biology. Abstract. This is a compulsory element of any dissertation, which covers the major points of the research. Its length ranges from 100 to 150 words. It should include the background of your topic, the objective of the research, its outcomes, and table of contents. Mind that all parts and chapters ought to be enumerated. Introduction. This section should kindle a desire to read your dissertation. Make it catchy, show the importance of your study. Implement a thesis and clearly describe your main purpose and objective to conduct a study. Informative sources. This section is not compulsory. This is the number of articles you’ve read that are related to your paper. Nevertheless, it will only benefit your project. Thus, your readers will see the whole scale of your work and what sources you used. Methodology. You cannot skip this section. A researcher ought to show the methods that were used to conduct the study. Moreover, you should explain why you have preferred these methods. Outcomes. The next step is to represent the outcomes of your research. Evaluate the information you have received. Use all related statistic figures. It’s important to remember that a researcher should not provide his/her personal opinion. Keep it for the section devoted to the discussion. Discussion. This part centralizes the outcomes of your research question. You should analyze and evaluate the findings you have received during the study. This is when you should likewise express your own opinion about the obtained results. Recommendations. Now, you should offer some recommendations in the regard of the obtained results. Interpret your findings and comment on the future of your project. Point out the probable improvements in the field you have selected. Bibliography. This is the full list of all information resources that were used and have contributed to the development of your project. These sections are the inevitable parts of the entire research project. You should find out how to accomplish each quickly and effectively. Take this matter seriously and don’t forget to use some facts to make the paper more catchy. The final evaluation of your biology dissertation is dependent on every stage. Make an effective outline and complete each stage in turn.

How Mother Nature Became the Inspiration Behind Velcro

How Mother Nature Became the Inspiration Behind Velcro Before the middle of 20th century, people lived in a Velcro-less world where zippers were standard and shoes had to be laced. All that changed though on one lovely summer day in 1941 when an amateur mountaineer and inventor named  George de Mestral  decided to take his dog for a nature hike. De Mestral and his faithful companion both returned home covered with burrs, the plant seed-sacs that clung to animal fur as a way to spread to fertile new planting grounds. He noticed his dog was covered in the stuff. De Mestral was a Swiss engineer who was naturally curious so he took a sample of the many burrs stuck to his pants and placed them under his microscope to see how the properties of the burdock plant allowed it stick to certain surfaces. Perhaps, he thought, they can be used for something useful. Upon closer examination, it was the small hooks that enabled the seed-bearing burr to cling so stubbornly to the tiny loops in the fabric of his pants. It as during this eureka moment that  De Mestral smiled and thought something along the lines of I will design a unique, two-sided fastener, one side with stiff hooks like the burrs and the other side with soft loops like the fabric of my pants. I will call my invention velcro a combination of the word velour and crochet. It will rival the  zipper  in its ability to fasten. De Mestrals idea was met with resistance and even laughter, but the inventor was undeterred. He worked with a weaver from a textile plant in France to perfect a fastener by experimenting with materials that would hook and loop in a similar manner. Through trial and error, he realized that nylon when sewn under infrared light formed tough hooks for the burr side of the fastener. The discovery led to a completed design that he patented in 1955. He would eventually form Velcro Industries to manufacture and distribute his invention. In the 1960s, Velcro fasteners made its way to outer space as Apollo astronauts wore them to keep items like pens and equipment from floating away while in zero-gravity. In time, the product became kind of a household name as companies like Puma used them in shoes to replace laces. Shoe makers Adidas and Reebok would soon follow. During de Mastral’s lifetime, his company sold an average of over 60 million yards of Velcro per year. Not bad for an invention inspired by mother nature. Today you can’t technically buy velcro because the name is the registered trademark for the Velcro Industries product, but you can have all the velcro brand hook and loop fasteners you need. This distinction was done on purpose and illustrates a problem inventors often face. Many words used frequently in everyday language were once trademarks, but eventually become generic terms. Well-known examples include  escalator, thermos, cellophane and nylon. The problem is that once trademarked names becomes commonplace enough, the U.S. Courts can deny exclusive rights to the trademark.

Poet Gwendolyn Brooks Research Paper Example | Topics and Well Written Essays - 1250 words

Poet Gwendolyn Brooks - Research Paper Example (Bigsby 23) At the age of seventeen, she started to publish poem regularly. As a first black woman, she served the position of â€Å"poetry consultant to the Library of Congress† and â€Å"poet laureate of the State of Illinois† (Gates 2). Among the Brookss works, lots of are written regarding to the â€Å"civil rights activism† of contemporary society. George E. Kent, the provider of Dictionary of Literary Biography, says that she holds an exceptional place in American literature (30). In Modern Black Poets: A Collection of Critical Essays, Richard K. Barksdale mentioned that the poems in A Street in Bronzeville and Annie Allen that won Pulitzer Prize, are loyal to miniature and abrupt representation â€Å"of the black urban poor† (Kufrin 67). Maud Martha, the detail about black woman’s existence in a short form and the first and only novel by Brooks, published in the 1950. Another remark about Maud Martha by David Littlejohn, in his Black on White : A Critical Survey of Writing by American Negroes, reflects that it is an outstanding human research (Littlejohn 78). In the â€Å"New York Times Book Review†, Toni Cade Bambara stated that when she was fifty years old â€Å"something happened to Brooks† and readers can get the evidence of that in â€Å"In the Mecca† and later works (Poetry Foundation). While Brooks’ poems â€Å"The Mother†, â€Å"The Crazy†, â€Å"Sadie and Maud†, and â€Å"To be In Love† comparatively work out the theme of a woman’s awkward, restricted and subservient situation in the society, in contrast, the poem â€Å"the Independent Man† upholds a man’s freedom (Evans 38). But all these five poems together highlight the inferiority of woman and the awkwardness and the inertia that a woman feels in the male dominated society. Though Gwendolyn Brooks’s poetry shows a strong commitment to her racial identity her poetic bent plays out a tone of universality through common daily

Read the following paper on Petroleum Engineering education and Essay

Read the following paper on Petroleum Engineering education and prepare a review summary report. ( read page 2, page 3 and page 4 ) - Essay Example Operations in the centre began in the year 2001 using an intricate system to select candidates because it allows for enrolment of students who have the capacity to capture significant information within a short time. Presently, the centre boasts of a competent team of mentors and research officers with each having a steadfast specialty in a given aspect of field development. The instructors can present and support various development projects before state officials. This makes the centre proud of having competent personnel focused on training elite individuals to work in oil companies. Academic success of learners entirely depends on the eminence of their background education. This calls for collaboration amid universities (Heriot- Watt University, Tomsk Polytechnic University, Pokholkov & Dmitriev 4). The most notable contribution made by the centre is the ability to improve the education quality control system. This is through the introduction of a component pertaining to training that allows for holding of mock examinations in accordance to the identical procedures as real exams. The exams are used to monitor the present academic progress of learners. Conclusively, graduates from the centre boast of favourable career prospects. They have a higher likelihood of holding top positions in major oil companies in the coming