Geography assignment Example | Topics and Well Written Essays - 1000 words

Geography - Assignment Example In reality, Western Europe probably has the resources to handle the aging population. What many experts are noting, however, is the reality that many traditional values are slowly being forgotten due a decrease in the native population of the region. The number of immigrants flooding into the region, bringing with them their own culture, values, and ways of life, is slowly blending in with other Western Europe traditions. This is slowly creating a new culture that many fear will mean the loss of many long-standing traditions that have been in place across the continent for centuries. Russia is facing yet a different crisis in terms of their recent decline in the native population. In previous decades, war and cultural conflicts have nearly decimated various sectors of the native population. This is quite troubling to the Russian people and they are fervently seeking out ways to reverse this trend and protect the less dominant groups residing within their borders. This brief paper wil l examine the issues surrounding this population decline within both Western Europe and Russia in an effort to better understand the importance of reversing this trend moving forward. Western Europe Western Europe has been undergoing a period of decline in terms of native population for quite some time now. Take Germany as an example. In Germany, if you take away immigration numbers, the net population would actually be declining. If these trends continue, Edmonston (2006) points out that, â€Å"The German population will eventually decline because of below replacement fertility, if net immigration does not counteract that decrease† (p. 513). Even if immigration does make up for the initial decline, the fear is that German culture will slowly be eroded and rewritten. The argument here is not centered on whether or not immigrants can assimilate into German culture. The reality is that immigrants are fulfilling a labor need and they are adjusting to the German way of life in re cord numbers. If this trend continues, however, certain traditions and values that Germans have held dear for centuries could easily become forgotten. The reality of population decline and the potential erosion of cultural values is not limited to Germany. All over Western Europe countries are grappling with the reality that native population growth is simply not keeping up with an aging and dying society. From the United Kingdom to France to Scandinavian countries, governments are faced with difficult decisions about how to deal with the problem. Part of the problem in Western Europe appears to be sociological in nature. Europeans, under systems of democracy, have seen less of an emphasis on class divisions in recent years. In addition, the general population is more materialistic than before and young adults have big dreams and ambitions for their life. Because of this, and the sheer expense of raising children, the birth rate has plummeted to levels never before seen. All of thes e reasons, and others, combine to form a reality where population growth simply becomes difficult to achieve (Ross, 2003, pp. 710-711) Russia The entire region of Russia has been experiencing a decline in their native population as well. In

English Banking Law Essay Example for Free

English Banking Law Essay INTRODUCTION: There are three types of cheque frauds exists in UK viz. forged, counterfeit and fraudulently altered cheque fraud. In 2005, the cheque fraud in U.K was estimated about  £ 40.3 million – a 13% decrease from the 2004 total of  £ 46.2 million. The earlier year figures also revealed a steady increase totaling  £ 36million in 2002 and  £ 45million in 2003.In U.K during 2005, counterfeit cheque fraud was estimated at  £ 3.23m, forged cheques fraud was estimated at  £ 30.9 m in 2005 and fraudulently altered cheque fraud was estimated at  £ 6.2 millions. SOURCE: FRAUD FACTS -2006 APACS- UK This paper studies the various protections available to banks and customers when using cheques as opposed to cards, as method of payment. PROTECTION AVAILABLE TO CHEQUE PAYMENTS UNDER BILL OF EXCHANGE ACT, 1882, UK (BEA) AND CHEQUES ACT 1957 Under Bill of Exchange Act, 1882, under section 81 A, a non-transferable cheques has been defined as follows†   Ã¢â‚¬Å"81 A (1). Where as cheques is crossed and bears across its face the words ‘account payee’ or a/c either with or without the word ‘only’, the cheques shall not be transferable but shall only be valid as between the parties thereto. (2) A banker is not to be treated for the purpose of section 80 above as having been negligent by reasons only of his failure to concern himself with any purported endorsement of a cheque which under subsection (1) above or otherwise is not transferable. (Cheques Act, 1992). One risk associated with the cheques bearing forged or unauthorized endorsements’. However protection is available under the English Bills of exchange Act, (BEA, or the Act). Under BEA, a legitimate holder of a cheques payable to bearer attain a good title to the instrument overcoming thereby any adverse claim of ownership that might have been hold good against his predecessor. Accordingly, the payment by the drawee bank to those acquirers discharges the cheques as well as the drawer’s engagement thereon so as to permit the drawee bank to debit the drawee’s account. But this is not applicable to cheques payable to order. In the case of payable to order cheques, effect of an unauthorised or an absence of endorsement or forged endorsement shall have to be looked into under the circumstances of forged endorsements. One of the ways to prevent forged endorsement or loss due to stolen cheques is to use crossed cheques or cheques payable in account. Cheques crossing are available under the BEA, UK. The crossed cheques requires to deposit the cheques into account rather than payable to bearer does not reallocate the cheques theft losses but it minimizes the loss and thus benefits the party on whom the loss falls. Further the losses arose due to stolen cheques or loss cheques payable to bearer fall on the dispossessed owner under BEA. Thus under BEA , reallocation of loss away from dispossessed owner may not be successful in case of crossed cheques payable to bearer as the onerous shifted to bank for its negligence. If a bank has acted in good faith and it is protected under BEA for the payment made to open cheques to bearer.    In the case of crossed cheques, if the bank seeks protection, it should have acted without negligence and in good faith. Under BEA, if forged endorsement losses fall on the taker from the forger who is naturally a bank. Further, the cheques payable to the order under the BEA, loss reduction thus seems to be mainly advantageous to the collecting bank. Further the collecting bankers of the crossed cheques are protected under the BEA over forged endorsements as long as they acted in good faith and without negligence. Further under BEA, the drawee bank is protected and this shifts the reallocation of forged endorsement losses to the first innocent party prior to the collecting bank.   Where the one who grabbed the payment through a bank account was the conman, such innocent party is construed to be dispossessed owner. Thus the crossing has reassigned the loss to the dispossessed owner, thus excluding the collecting bank that took the cheque from the conman. Thus under BEA, protection is available to banking channel had they acted in good faith and without negligence even in case of crossed cheques .If an open or crossed stolen cheque has been collected by or paid to the conman , the loss is assigned to the dispossessed owner .Under UK laws , where a cheque is payable to order is collected or paid over a forged endorsement for or to a non-bank situated in the chain of title subsequent to the conman, loss is assigned to the non-bank from that of the conman. This is apart from of whether the cheque was collected for or paid to the innocent taker from the conman or someone obtaining title from the conman despite of crossing.   Where the cheque is crossed and it has to be paid into a bank account and then only it can be encashed as it will be convenient for the dispossessed owner to trace that person and assign the loss to him. Thus the crossing of cheque becomes more helpful to the true owner. However thus the innocent endorser has to bear the loss as the benefit is not in the reallocation of losses. The best example of the above is the Nigerian gangsters operating in UK and taking the gullible students who are in the poverty to carry out cheque fraud worth  £ 50 million a year. These Nigerians conman recruit poor students with promises of good cash reward for just providing the conman with their bank account particulars. By using stolen corporate cheque books, they then deposit huge amount of British pounds through the accounts. No sooner the account is credited with the collection amount from the fraudulent cheques, the account will be emptied before the firm or bank realizes what has happened. The major lion’s share goes to the conman and only a very meager amount goes to the innocent, poor student who has provided the bank account number to the conman. When the fraud comes to light due to alerting by the bank to the police, it is the poor, innocent student who will become the scapegoat. The conman mainly selects the students from Camden in North London where thousands of students from the capital’s universities congregate. Conman liberally offer them up to  £ 5000 for doing nothing. Then the conman approaches an insider who is working in the royal mail and induces them to steal a company’s cheque book. Then the conman visits the company office to collect the director’s signature from the dustbin and thus they scrupulously copy the same in writing the bogus cheques.   Thus the conman had a fortune by sharing a lion’s share in the booty leaving the innocent, poor account holder to face police and possible fraud investigation.[i] Banks and building society’s in UK from September 2006 onwards is not to accept the cheques that are issued in favour of the banks itself in a move to avoid frauds. Bank is to insist to issue the cheques payable to an individual or to include the individual’s name on the payee line after the name of the institution. This strategy is mainly designed to ensure that the money lands in the right account and to bring to an end to cheque fraud which reached to a height of  £46.2 million in 2004 which includes counterfeit and stolen cheques. This modification is being launched following a case in which an independent financial advisor informed his clients to draw cheques out to the financial institutions where the money was going to be invested. He then paid them in to his own account, rather than the customers account.[ii] Under the BEA , there is a provision with a bill containing words prohibiting transfer or indicating an intension that it should not be transferable and these instruments is termed as ‘ not negotiable’. As such these instruments can not be negotiated by the payee to another holder. In UK, an account payee or a/c payee and with or without the words only can be encashed only by the account holder and thus it can not be encashed other wise than by an endorsement. Further, under the BEA, the consequence of an unauthorised or forged assignment is similar to that of forged endorsement as both do not convey title. Under BEA, in there is no acceptance, the drawee can not be held liable on the instrument and it does not exclude in tort or in receipt of money provided elements of such liability are present. If the drawer has given sufficient notice well in advance informing the drawee about the forged endorsement and the remedy available to the drawer against drawee for the forged endorsement is under contract and this arises regardless of any particular provision of the BEA. Further under BEA , no remedies is specified for the misappropriation under forged endorsement but the injured can avail the common law remedies for the embezzlement of property in chattels generally rather than stipulating specific recourse to the true owner of misappropriated cheques. Further the loss of cheque does not forfeit the action on it under the BEA. Under BEA, no title is passed on under the forged endorsements and one who derives the title under forged endorsement can not enforce payments against a prior party to the forgery. Further no payment is made under due course so as to discharge the cheque and to preclude drawee’s liability against the drawer. Thus the original owner from whom the cheque was stolen and forged inherits the right to and on the cheque and he has a right to sue for the wrongful interference with his rights. Further under BEA, an endorser is barred from refuting the authenticity and promptness of all previous endorsements and at the time of endorsement, he had a good title and this denial will be advantageous for the holder in due course later. Further under BEA, the drawee bank can base its reliance on laws governing mistake and restitution for the payment made over a forged endorsement. Further, under BEA provisions, true owner may recover on the lost cheque from any party prior to the falsification till up to the drawer. Under BEA, cheques payable to fictitious or non existing persons is deemed to payable to the bearer. A collecting bank can not be held responsible for payment made to a thief if it is drawn on fictitious name and if they have acted in good faith which absolves the collecting from its liability. In Fok Cheong Shing Investments v. Bank of Nova Scotia, the president of the drawer who turned to be the authorised signatory of the company issued a cheque to a real person with an intention for misappropriation. The loss was allocated to the drawer under the fictious payee provision. Thus the drawee bank is being protected under the BEA if it has paid a cheque over forged endorsement in the ordinary course of business under good faith. Thus the statutory protection is extended to the collecting bank which collects in good faith and without negligence a cheque bearing a forged endorsement. S 60 of the BEA does not warrant that drawee bank should act with out negligence. However one may assume that a bank has to act without negligence in the ordinary course of business. The UK Review Committee on Banking Services Law and Practice considered provisions ss.60, 80 and s.1 of the Cheques Act 1957. The committed recommended to combine these provisions under single enactment so that statutory protection may be extended to a paying bank acting in ’good faith’ and without negligence. Both the s 82 and s.1 of the Bills of exchange (crossed cheques) Act were repealed by the Cheques Act 1957 in UK which mainly extended the protection to open cheques and other payments documents. In UK, the drawee is primarily liable to payment, the endorser is liable secondly and the drawer is the ultimately liable to payment upon dishonor. Not withstanding this, the drawer and the endorser may sign without recourse. The United Nations Convention on international Bills of exchange and International Bills of Exchange and International promissory notes , 1988( UNCITRAL Convention) specifies that the drawer may exclude his own liability for acceptance or deferment by an express stipulation in the Bill. Such stipulation will hold of use only where another party is or becomes liable on the bill. PROTECTION AVAILABLE TO PAYING BANK: Section 24 of the BEA states that a forged signature is no signature. In Brown v Westminster Bank (1964), the estoppel caused from the misleading facts from the client. In this case , the bank has reminded a old lady , the customer against the veracity of the signature as her signature was forged more than in 300 cheques and in turn she certified that the signature was her own.   When the bank was sued by her son later, it was held that bank was not liable and they were estopped from denying the genuineness of the cheques. In Tai Cotton Mills Ltd v Liu Chong Hing bank (1985), it was held in this case that a customer of a bank needs to check his bank statement to keep on watch that the forged cheques were processed. The bank’s express condition to the contrary in the contract with customer can absolve the banks from the wrongful debit. Like wise if a bank pays a cheque in breach of a mandate by oversight, it has the right of subrogation and the bank has the right to take the possession of a title or good that it effectively paid for. PROTECTION IN THE CASE OF CONVERSION: It is not necessary for the bank to check every endorsement on the cheque and it would be time consuming and onerous to do so. So as to assuage the liability of banks, BEA (1882) and the Cheques Act (1959) offer defense for the paying bank. Bank of Ireland v Hollicourt (Contracts) limited (2000) EWCA Cir 263. A suit was filed against a bank which continued to pay on cheques against the company’s bank account even after filing of a petition for bankruptcy. It was held that the bank had acted as an agent and didn’t have any beneficial interest and the legislation made the disposition void but that did not operate the way claimed. Roger Smith and Christopher Trimothy Esmond Hayward and Lloyds Bank TSB; Harvey Jones Ltd and Woolwich Plc (2000). Where a cheque has been misused falsely to change the name of the payee, then the piece of paper can not be termed as a cheque and an action for alteration against the collecting or paying bank will stand only as the nominal value of the paper and not as to the face value. As the material alteration was carried out with out assent of any one but the fraudster and under the bill is avoided save against a party consenting or making to the alteration. PRECAUTIONS TO BE OBSERVED WHILE WRITING A CHEQUE: Write clearly the name of person in whose favour your are writing a cheque with additional information like Dr, Er, his shop name or company name etc. From September 2006 on wards whenever you issue a cheque to UK building society or to a bank, add additional information other than the name of the bank or society like account no, bank branch name etc. To prevent fraudsters to add words in the empty blank space available in the written cheque, it is always better to draw a line through unused spaces. Don’t pre sign blank cheques and also try to fill all the details like full name, amount in figures and words and don’t issue undated cheques. Always issue ‘account payee only ‘crossed cheques’ to avoid any frauds. CREDIT CARD CHEQUES: These cheques have been issued as an additional facility on credit card accounts for the last 10 years in UK. These are similar to the normal bank account cheques and can be deployed for the same purpose. During 2004 , about 3.4m credit cheques have been issued which constitute a very little percentage (2%) as opposed to overall number of credit card in operation which totaled to 1.727 billion in the UK according to APACS , the UK payment association. The credit card cheques are likely to bounce in most of the cases if credit limit has been crossed. These credit card cheques are utilised for high value transactions ranging from  £ 850 as against  £ 58 for a UK credit card purchases and  £ 120 for payment of a personal cheque. In credit card cheques, the customer need not ask for the cheques from the credit card issuer but they are issued at the discretion of the card provider and there are different terms and conditions applicable to transaction done through credit cards cheques as compared with a credit card and this is being unaware by the most of the customers. One of the disadvantages is the fraud that is prevalent in the credit card cheques as the most of the issuer are forwarding it to their customers on discretionary basis. These credit card cheques are vulnerable to fraudulent activities as most of the customers do not aware that credit card cheques have been dispatched to them. In the case of these credit card frauds, lender has to bear the losses rather than customer. CREDIT CARD FRAUDS: Credit and debit card frauds cost  £ 400 m during 2004 and devise deployed by the fraudsters have become sophisticated.One of the remedy is to insure against the ID theft. Some insurance company offer it as free adds on with home insurance policy. One of the protection for the prevention of credit card frauds   is the introduction of new industry standard namely ‘Chip and Pin† which required implanting a microchip inside the credit and debit card and mandates that consumers key in a secrete four-digit personal identification number to complete a transaction using the card. As the result the consumers deceived by the fraudsters are on the decrease in UK. [i] Dan Evans, â€Å"Gang’s Pounds 50m stolen cheque racket ‘, Sunday Mirror, Jan, 12, 2003. [ii] â€Å"Banks put checks on Cheques in new bid to beat pounds 46 million fraud, The Birmingham post, December 8, 2005, page 24. Check Your Balance before the Match. The News Letter (Belfast, Northern Ireland) : 11 Cheques in the Post-Mortem. The Birmingham Post (England) 21 Jan. 2006: 27. Cheques to Be Stubbed Out. After 350 YEARS; Signed and Sealed. The Mirror (London, England) 10 Nov. 2004: 1. Fraud Bill Shock. Evening Gazette (Middlesbrough, England) 31 Jan. 2006: 2. Ghost Workers Help Fraud to Soar. Western Mail (Cardiff, Wales) 2 Feb. 2005: 6. King of the Cons. The Mirror (London, England) 11 Jan. 2005: 10. Postman Given Asylum Plundered [Pounds Sterling] 20million. The Daily Mail (London, England) 21 Dec. 2005: 17. Store Bans Slowcoach Cheques to Speed Checkouts. Western Mail (Cardiff, Wales) 3 Apr. 2006: 4. Sally Ramage Dabydeen, â€Å"Legal and Regulatory Frame work â€Å"iUniverse, 2004.

Factors Affecting Contrast In An Xray Image Health Essay

Factors Affecting Contrast In An Xray Image Health Essay To test resolution, a line pair guage is used. To measure MTF in an x-ray system, the sine wave equivalent of a line pair gauge is used. The closest distinguishable pair of cycles determines the best MTF, it is quoted in cycles per mm [2]. A common way to express the system resolution is to quote the frequency where the MTF is reduced to either 3%, 5% or 10% of the original height [3]. MTF and spatial frequency are related by MTF curves. Examples of MTF curves are given below; Mammography System: Fig 2: MTF curve for a mammography system [4]. Chest Radiography System: Fig 3: MTF curve for a typical chest X-ray. Three different detector types are indicated on the plot [5]. Fluoroscopy System: Fig 4: MTF curve for a Fluoroscopy system with plots shown for individual components of the imaging process. The film and the optics have excellent resolution. The MTF of the imge intensifier is shown to have a limiting resolution of approximately 4.8 cycles/mm. The TV camera is the worst in the series, it limits the MTF of the overall image during live fluoroscopy and videotaped imaging. [6] Question 2: Contrast is the variation in brightness or optical density across an image. Factors affecting contrast in an x-ray image include the tube output, or the kVp. This is a measure of the energy of the x-ray beam leaving the x-ray tube and passing through the patient to form an image. X-rays with higher kVp can penetrate deeper into materials. In an image with the correct kVp bone is white and soft tissues and air are gray/black. If the kVp is too high, the x-rays will pass through even dense bone, creating an image that is mostly black with indistinguishable features [7]. The opposite occurs when a kVp which is too low is used. The most suitable kVp depends on the feature under investigation. Also among the factors affecting the image contrast is the patient. The density, the atomic number Z and the thickness of the part of the patient being imaged. Denser tissue, tissue with higher Z or tissue of a greater thickness results in lighter areas on the image because they have blocked the x-r ay from exposing the image receptor. Variation in contrast occurs because tissues in the body attenuate x-rays differently. The human eye can percieve a difference of approximately 2% in contrast between adjacent areas [8]. The final influence on image contrast to be discussed here is the image receptor. In film imaging, the contrast of the resultant image depends on the sensitivity of the film used. To produce an image with the correct contrast, a film with corrresponding sensitivity must be chosen before imaging. In digital imaging, there is no fixed sensitivity. It has the advantage of being able to record the full range of exposures and digital processing after imaging can be used to improve the contrast in the image. Image contrast can be evaluated using a densiometer. This device emits light of a known energy. The light is reflected back from the image and detected by the densitometer. The difference in energy between emitted and detected light is used to compute the optical density (blackness) in that area. Since contrast is the variation in optical density, this method can be used to survey the contrast in the image. Question 3: The following description is based on an article from the NDT database [9]. Spatial resolution of an x-ray system is limitied by the size of the focal spot. Fourier analysis can be used to calculate the focal spot size. X-rays are passed through a test object with a known pattern. This test object is placed between the x-ray source and detector, the arrangement is shown in the figure below. The focal spot of the x-ray is not assumed to be point-like, as the detector is moved away from the source, the detected focal spot appears larger. Blurring of the image by the detector is included, this blurring is related to the point spread funtion (psf) of the detector. Otherwise, an ideal detector is assumed. Image deterioration due to noise is also factored into the description. Fig 5: Setup for determing the focal spot size. The X-ray source, the flat object, and the intensity distribution measured at the detector system lie in different planes for which different coordinate systems with the variables (x, y), (x, y) and (x, y) respectively, are used. This is done in order to include magnification effects in the calculations. The measurement of the x-ray transmission, t, is derived mathematically. This is done by convolving the intensity distribution of the focal spot f with the transmission profile of the flat object g and the detector point spread function d. Also, t is deteriorated by noise, which is taken into consideration by addition of a noise term n to the result of the convolution. In order to take into account the geometrical magnification, V, of the setup, these functions are represented in one of these planes (here the plane of the detector), whereby the physical magnification effects of the setup were observed before the convolution is accomplished, this is shown in the second part of the equation below. The magnification is the distance between the source and the detector system divided by the distance between the source and the object. The Convolution Theorem states that the Fourier transform of a convolution is the product of the Fourier transforms. Conversely, the Fourier transform of a product is the convolution of the Fourier transforms. Using the above equation, a deconvolution of t with gâ‚ ¬Ã‚  (â‚ ¬Ã‚  d yields an estimate of f. In a technique like this, a suitable test object is measured. The resulting image corresponds to a convolution of the test object with the intensity distribution of the focal spot and other factors. Information on the focal spot is derived from this measurement using knowledge on the test object and other influencing values which means that the convolution process is undone to a certain extent. Also, with the presented method an arbitrary two dimensional intensity distribution can be measured, regardless of shape. According to the convolution theorem, a convolution in the spatial domain corresponds to a point-by-point multiplication in the corresponding Fourier domain. Furthermore, according to the addition theorem, an addition in the spatial domain corresponds to an addition in the corresponding Fourier domain. (Note: lower case letters represent functions and upper case letters represent the Fourier transforms of the equivalent functions.) The initial equation now becomes; At certain spatial frequencies | N | can be significantly higher than| F Æ’-â‚ ¬Ã‚  P |. At these spatial frequencies division of T by P mainly increases noise and deteriorates the image quality. This is due to the fact, that information on F is lost at these spatial frequencies. For that reason, independently of the deconvolution method applied, all spatial frequencies which are contained with high intensity in | F | should be contained with high intensity in |P| in order that | FÆ’- P | is significantly larger than | N |. This means that the test object (in combination with the detector imaging properties) should contain the major spatial frequencies which are required to describe the focal spot with sufficient intensity. In this case F can be restored well at these spatial frequencies, which yields a good estimate of f. Question 4: Using a bar phantom similar to that used for determining resolution can lead to an error determining the focal spot size. This is because the line pairs are aligned in one direction only. For accurate measurement of the focal spot size, many images with the bar phantom at different angles would be necessary [10]. To overcome this problem, a star phantom is used. This is a disc of alternating Lead spokes and x-ray transparent material. At a particular diameter of the focal spot the image of the spokes blurs, i.e., adjacent spokes cannot be distinguished from each other. The diameter of the blur is an indication of the focal spot size [11]. Fig 6: Star pattern for testing focal spot size [12] Question 5: 5a. The most obvious parts of a CT scanner are the moving patient table and the gantry or tube. Conventional projection radiography is limited because it collapses 3D objects onto 2D images. CT has a rotating system of emission and detection and so it can give accurate 3D diagnostic information about the distribution of structures inside the body. Inside the gantry there is the X-ray tube, x-ray detectors and slip-rings. The X-ray beam is collimated and radiates in a fan-beam shape. The x-ray emitter and detectors rotate in the gantry to measure projections that form an image that is a slice though the body. There are brushes around the rotating slip-rings to transmit signals. In CT, the linear attenuation coefficient, ÃŽÂ ¼ is measured. This tells how much intensity is lost as the beam travels through the medium. This distribution of ÃŽÂ ¼ is the basis of image formation. There are two distinct motions of the x-ray beam relative to the patients body during CT imaging. One motion i s the scanning of the beam around the body. The other motion is the movement of the beam along the length of the body.   This is achieved by moving the body through the beam as it is rotating around Fig 7: External appearance of a CT scanner. [13] Fig 8: Basic schematic of the construction of a CT scanner. Fig 9: CT image quality and electromechanical acceptance tests. The Priority column indicates which of the tests are the most important. [14] 5b. CT images are formed by multiple intersecting projections. This is illustrated in the figure on the left. In the bottom right section, it is seen that the combination of the projections causes blurring in the final image. The blurring goes as 1/r, i.e., it is proportional to the distance from the centre point. The 2D Fourier transform of 1/r is 1/à Ã‚ . Since the inverse of 1/à Ã‚  is |à Ã‚ |, it is possible to compute the 2D Fourier Transform of the blurred image, multiply the Fourier transform of the resultant image by |à Ã‚ | and the calculate the inverse Fourier transform to obtain a sharper image [15]. Fig 10: On the left, unfiltered back projections and on the right, filtered back projections. The conversion is done in the spatial domain by convolving the projection with the IFT of |à Ã‚ |. Fig 11: The mathematics of the image reconstruction process, can be expressed compactly in the above equation, where the terms have been grouped to reflect the filtered-back-projection approach [15]. 5c. The fundamental system performance indicators are CT number, resolution, noise, and patient dose.26 The accuracy of CT numbers is measured by scanning a water-filled phantom at least monthly. The CT number for water should be zero over a 20-cm-diameter phantom, with a variation of less than 1 CT number. Deviation from the expected CT number of 0 for water at any energy is adjusted by applying a correction factor for the pixel value. Constancy of the value should be monitored with a daily scan. An overall check of system performance is obtained from semiannual measurements of CT image noise, defined as the standard deviation of CT numbers in a region of interest. Constancy of performance is checked by evaluation of the standard deviation in the daily water scan mentioned previously. Resolution is measured by scanning phantoms on a monthly basis. Of particular importance is low contrast resolution, which is a sensitive indicator of changes in component performance as they affect noise. Patient dose is evaluated semiannually. Specially designed ionization chambers provide measurements from which the dose may be calculated for the exposure conditions (narrow beam, variable slice thickness) used in CT. The values should agree with manufacturers specifications to within 20%. [hendee]

Powerful Symbols and Symbolism in The Glass Menagerie :: Glass Menagerie essays

Powerful Symbolism in The Glass Menagerie      Ã‚  Ã‚   Tennessee Williams' The Glass Menagerie is a classic among classics for a number of reasons. The narrator, Tom Wingfield, gives the reader an inside look into the lives of a common family living in the pre-war depression era. The members of this family experience a great deal, and their lives are made much more vivid and meaningful through Williams' use of symbolism. Three well-crafted symbols are the fire escape, which provides hope and an escape to the outside world and from it; the glass menagerie, which is a metaphor for Laura's fragility and uniqueness; and rainbows, which symbolize unrealized hopes and aspirations. Through the use of these symbols, the reader is presented with the universal theme that unfulfilled hopes and desires are an unwanted, albeit important aspect of the human experience. This theme is revealed in a stylized, artistic manner, which is one of the reasons why The Glass Menagerie is a meaningful classic.      Ã‚  Ã‚  Ã‚  Ã‚   Symbols are a major part of this play that Tom, who is a poet, admits he has a weakness for. One of the first to be presented in the story is the fire escape that serves as the passageway to the apartment. The escape has a different meaning and function for each character and is also said to have an "accidental poetic truth" (21). For Tom, it is a means of escape from fire, "the slow and implacable fires of human desperation"(21). This is especially true of Tom's apartment, which is "both literally and metaphorically a trap which Tom and his mother, at least, wish to escape" (Bigsby 34). His mother, Amanda, is devastated after her daughter Laura's failure to cope in business college. This is a let down of Amanda's hopes of escaping because she has "invested what little she had to free both herself and Laura" (Bigsby 34). Amanda then becomes obsessed with finding Laura a gentleman caller so that she can marry and be supported as another means of escape, at least f or Laura. When this caller finally comes, and it seems like it was meant to be, as they dance and kiss, he announces he is engaged, and dashes their hopes. The ever-fragile Laura, temporarily drawn out of her dream-world shell of her glass collection and the victrola, draws further back into herself. Now a terrible desperation fills the apartment, and Tom decides he must escape the suffocating environment to follow his own calling.

Sears Company Analysis Essay -- essays research papers

  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   1 I.  Ã‚  Ã‚  Ã‚  Ã‚  Executive Summary Sears began as a small retailer but as the years have gone by, they have become the second largest retailer of the national chains. In the environmental analysis you will discover that Sears’ marketing toward women differentiated them from their competitor’s and increased their sales as well as their market share. They have had many social/cultural problems that they have had to overcome, such as problems with stakeholders. There has also been a change in the company culture that has improved the mood within the company.   Ã‚  Ã‚  Ã‚  Ã‚  In the SWOT analysis, the strengths, weaknesses, opportunities, and threats will be discussed. These would include employees, competition, global marketing, and the repercussions that Sears has had to face when going against the Federal government.   Ã‚  Ã‚  Ã‚  Ã‚  The Strategic Analysis will show some of the steps that have been taken to overcome some of the difficulties that Sears has had. The newest CEO, Arthur C. Martinez, has been a motivating leader for the company. He has implemented many changes that have increased sales and moved Sears back up to the top of the retail chain. These changes would include store remodeling, Internet strategies, differentiation, and human resource management.   Ã‚  Ã‚  Ã‚  Ã‚  In section V, I will give my analysis of Sears and some suggestions for things that they can do to change their strategies such as keeping customer’s and employees happy and staying out of trouble with stakeholders.   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   2 II. Environmental Analysis   Ã‚  Ã‚  Ã‚  Ã‚  When Richard Sears first began a small retail business selling watches in 1886, he could have dreamed of his store becoming a success but the success it has become, had to be beyond his expectations. Sears has seen many different changes in business and has had to adjust to t... ...p;  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   10 Sears. If Sears continues to provide employees with all of the perks and benefits that they have been, then they won’t have a large turnover and they will have their loyalty. Sears does have a fairly good reputation despite the bad press that they may have received because of problems they have had with the federal government. If they can keep out of trouble and try to keep their reputation clean, they should be able to leave these problems behind them. People will forget unless they run into similar problems again. Sears has gotten a good start on their Internet venture. They do have a lot of competition in this regard and a â€Å"new† business does take a while to get off the ground. Therefore it’s not surprising that they have had a slow start but they are beginning to pick up with the alliances and partnerships that they have entered into to boost their exposure. Their e-commerce trade could become as big as their chain of retail stores. All-in all, I believe that Sears is on the right road to recovery.   Ã‚  Ã‚  Ã‚  Ã‚  

The Old Ball Game :: essays research papers fc

The Old Ball Game An American dream can be defined through an examination of the American lifestyle, and by picking out the most common themes. The most common themes Americans associate with are the basics: graduating at the top of the class, finding a high-paying job, settling down with the perfect spouse, a house in the suburbs with a white picket fence, two children running through the yard chasing the dog and of course apple pie and baseball. Yes, baseball is considered by many to be part of the American dream. It is through baseball that many can relive their childhood. It has been the one daily and constant event that the American society depends on to be there during every summer night. The annual fall classic, the World Series, catches the attention of the entire country. Like the New York Yankees, baseball has become a part of America. After World War II, many countries were completely demolished physically and mentally. Among these countries was Japan. Countless numbers of Japanese people were dead, and land, buildings, and entire cities were destroyed. For the first time in Japan's history, their "God" had spoken to the public destroying his immortal reputation. During the postwar years, Japan looked to the major powers of the world to develop a foundation for a new country. Included in this foundation was a need for new ideas and dreams. Of course Japan did not completely erase thousands of years of tradition and culture, but Japan did take many international ideas and transformed them into her own. In the Movie Mr. Baseball, a Japanese woman describes Japan's borrowing techniques. "Japan takes the best from all over the world and makes it Hers" (Welles). Included in the world powers of the time was America; therefore, Japan borrowed several ideas from the United States. One such idea just happened to be America's National pastime, baseball. The history of Japanese baseball dates back to the middle 1800's. They "adopted baseball from the U.S. as early as 1873" (Constable 23), but the spark for baseball ignited during the post war occupational years. A foreign student from Japan explains, "The thousands of American troops stationed in Japan after the war kindled the passion for baseball that was lacking before the war" (Akutsu). The American soldiers showed the Japanese the American ways of baseball, and the popularity of Japanese baseball has skyrocketed from that time on. Baseball in Japan has reached the top level with its professional standings. Many other countries throughout the world have tried to establish the American sport of baseball but "Japan is the only country in the world to have

Chemical element

True The half-lives of unstable isotopes vary from milliseconds to billions of years. The combining of atoms is known as nuclear fusion. Multiple choice (271)mints) The man responsible for discovering that the atom is mostly space is: Rutherford false statement concerning matter is: All matter contains mass. The true statement concerning the atomic nucleus is: It is made up of electrons only. The element has how many protons? 7 has how many neutrons? 146 Which statement is true? Isotopes of a given element have very similar chemical properties. The atomic number of an atom is equivalent to the number of: protons Rutherford coined the term used for the simplest positive charged particle and called it the: neutron An alpha particle is: an electron Select all that apply. In the vertical columns of the periodic table: All the physical properties are identical.The number of positive charges in the nucleus of an atom is equal to: its atomic number Most of the mass of an atom is made up of: The protons and neutrons Movement of electrons about a central nucleus is a concept by: Boor Periodicity is best defined as: The repeating nature of physical and chemical properties with increasing The last element in any period always has: eight electrons in the outermost energy level The maximum number of electrons in a p sub-level is: 3 The 3 in up represent TTS: the number of electrons Name the element that corresponds to the following electron configuration. 2 , as , up neon 22 61 What does the p mean in Is as the p shell What causes the lines in the spectrum for elements? None of the above What is the maximum number of electrons found in any shell of the known elements? 8 A principal quantum number refers to: The numbered energy levels starting from the nucleus outward 2 2 The electron configuration of En is: Is In the vertical columns of the periodic table, as the atomic numbers increase: The numbers of electrons in the valence shell increase.