Cookbooks Essay Example | Topics and Well Written Essays - 2500 words

Cookbooks - Essay Example Debates abut eating in raise a range f questins that are central in understanding fd cultures. In particular, they raise questins abut the rle f fd practices in prducing, and reprducing the hme, the family, gendered identities and the relatinship between public and private spheres. The purpse f ckbks is t prvide peple with new recipes and help them t verify their diet. At the same time, printed ckbks als help t usher in a prcess f change, allwing imprved r imprvized versins f traditinal recipes t be passed n mre rapidly. Since the early develpment f such bks cincided with the emergence f 'a prfessinal elite f cks in the service f members f the upper class', the pressure t imprve and imprvize is itself increasing. The example f England and France shw that English ckery bks tend t have a dmestic, female target audience. Thus, while French ckbks tend t be aimed primarily at the prfessinal male chef, the nbility and the upper-middle classes, English bks are aimed mre at female husekeepers, and mre ften at lwer scial strata than their French cunterparts. The article "Rmanced by ckbks." Anne L Bwer depicts impact and influence f new cking culture n sciety. The authr underlines that ckery bks can perate as vehicles fr cnstructing an image f the natin, just as they are capable f negtiating certain frms f female dmesticity. Alternatively, ckbks 'invent and cdify new, verarching categries which make sense nly frm a csmplitan perspective' (ibid.). The authr, fr example, inflates a particular culinary traditin 'and makes it serve, metnymusly, fr the whle'. Increasingly, Bks n Indian cuisine als seek t impse a menu-like structure n the recipes they ffer. This helps t cdify and rganize Indian fd in a systematic manner but, in s far as 'Indian meals d nt nrmally have a significant sequential dimensin', it prvides a clear example f the cnstructed nature f 'Indian' cuisine (Swallw 19). Duruz, (1999) and Duruz (2994) state that the purpse f ckbks are t keep ld traditins and recpies. Fd practices need t be understd in relatin t the ways in which they prduce, negtiate and reprduce the nature f the relatinship between public and private spheres. Indeed, in Duruz (2994) study f cking, the authr fund that eating in was a significant act because 'the cked dinner marks the threshld between the public dmains f wrk r schl and the private sphere behind the clsed frnt dr'. 'Hme-cked' meals are seen as imbued with the warmth, intimacy and persnal tuch which are seen as markers f the private sphere and in ppsitin t fds which are the prducts f a public, industrialized and annymus system f fd prductin. It is fr this reasn that cmmercially prduced fds ften seek t add value t their fds by assciating them with 'hme', demnstrated in claims t 'hme-cked' fd in pubs and diners and 'hmestyle' ranges f ready-meals frm supermarkets (Swallw 12). The authrs underline that cking and ckbks can be seen as nstalgia fr better days. Ntins f 'a prper meal' are ften linked t nutritin. These definitins ften draw n a range f scientific discurses in which the 'gdness' f a meal is equated with whether r nt it gives us the 'prper' nutrients. Ideas abut nutritin are ften far frm bjective: what cnstitutes a nutritius meal in ne decade will nt be necessarily the same in the next as

Knowledge of management & Information systems Assignment

Knowledge of management & Information systems - Assignment Example Knowledge management can be described as an organisation’s ability to share, create as well as use the collective information about its processes, products as well as human resource for increasing workplace productivity and reducing activities that put the company in backward position. As organisations are seeking advantage in highly competitive markets, they are increasingly looking for an untapped resource which is knowledge of their employees and organisation’s resources (Alavi and Leidner, 2001). Problems regarding knowledge management can creep in various forms. These can be unsuccessful alignment of knowledge management strategies applied within the organisation. It can also be failure in understanding and incorporating knowledge management into the daily activities of individuals. Another major knowledge management issue faced by organisations in the current business environment is focussing knowledge efforts within organisational boundaries only. Wide disparitie s in maintaining up-to-date infrastructure as well as cultural diversity make knowledge management challenging and cumbersome, especially in developing countries. Though TPMT is based in United States, majority of its client base is in Africa. Thus, culture disparity and lack of technology and resources have created contextual issues for the company. Even though the company is able to meet human resource needs, cultural and infrastructural gap create major problems in the business operations. Thus, it can be concluded that cultural. and infrastructural gaps are the major knowledge management business problems faced by TPMT. Global Diversity in culture has reflective implications on the successful plan and implementation of various Knowledge Management projects. Thus, while creating organisational objectives, global organisational contexts such as, innovations and performance, should be taken into consideration (Avgerou, 2002). In the present case study, the company is facing problems such as, lack of commitment among directors as well as part-time workers in African countries. The directors also face difficulties in enhancing relationships among employees, customers and agents. It is evident that the organisation lacks engagement from the employee’s perspective. Thus, establishing better interaction between organisation and its agents will help in building confidence and loyalty towards the company (Yue, et al., 2009). Web 2.0 Overview The term, Web 2.0, is used to describe various websites and their applications which allow users to create, share and update online information as well as other materials created by them. A major key element of this technology is that it helps individuals to create, collaborate, share and communicate. The major difference between Web 2.0 and other websites is

Comparison of How it happened and The Signalman Essay Example for Free

Comparison of How it happened and The Signalman Essay The atmosphere in How it happened is full of mystery and energy. The plot moves very quickly, imitating the speed of the automobile as in the story it is said the automobile has a horse power of thirty, Then I remember the big motor, with its glaring headlights and litter of polished brass, waiting for me outside. It was my thirty-horse-power Robur, which had only been delivered that day. It also emphasises the lack of control the driver has over it. Whereas the atmosphere in The Signalman creates both suspense and mystery. The appearances of the spirit help to create suspense as we anticipate them to lead us to the climax. However, we find out at the end of the story that the signalman was getting premonitions of his own death. The appearances are really red herrings as it is the signalman himself who dies. Whereas the biggest red herring in How it happened is how the narrator speaks from memory in the first person, fooling us into believing he must still be alive. This makes the twist at the end so much more powerful. The difference of experience between the first time reader, who is fooled into believing the narrator must still be alive and the 2nd time reader who is able to pick out things that are ironic, for example, I can live it again. The 2nd time reader knows hes dead when hes saying it. Dickens creates a strong atmosphere through the characterisation of his characters as well as his long complex sentences that can be difficult to understand. This is because of the 150 year cultural gap of reading the story. This makes differences with the way we read the story. For example, The monstrous thought came into my mind, as I perused the fixed eyes and the saturnine face, that this was a spirit, not a man. The word monstrous meant abnormal in 1866. This also shows Dickenss effort to create psychological state. He also describes things very ambiguously, for example, I resumed my downward way, and stepping out upon the level of the railroad, and drawing nearer to him, saw that he was a dark sallow man, with a dark beard and rather heavy eyebrows. His post was in as solitary and dismal a place as ever I saw. The words underlined make the signalman difficult to imagine because if everything is dark, you would not be able to make out his features. The title How it happened is deliberately allusive to draw the reader in. But, it does immediately introduce suspense as we wonder what it refers to. Whereas the title The Signalman conveys urgency. The characterisation created in How it happened is that the narrator characterises himself as a risk taker, admitting one often does foolish things to the reader. This adds to his sense of honesty but also makes us question his decision taking. Also, it provides tension between two ways of behaving which should interest us. Whereas the characterisation created in The Signalman is a bit different because both the characters remain shrouded in mystery and this adds to the sense of curiosity that surrounds the story. We dont know the protagonist intimately to picture him in our mind. The themes in The Signalman include death, the supernatural and reason. Dickens sometimes uses the convention of quotation marks and sometimes does not. This reflects the contrasts of rationality and supernatural goings on. The narrator tries to give reasons to the visions that the signalman has, yet the final image of the story is of the narrator seeing the image of the signalman and the ghost himself. Dickens cleverly manipulates tension to give the final image the haunting effect. Whereas in How it happened, Arthur Conan Doyle was an apparent rationalist and he believed that after your death, you could continue to live on as a spirit. It was also believed that these spirits could communicate with the living through people known as mediums. This belief is present in the story where the narrator has survived his death in order to tell us how it happened. This idea is given more credit when we know that the story originally started with the line, This story was told to me by a medium . The story How it happened was written in 1918 and involves a high-powered automobile. This suggests to us the story must have been written about the present at the time. It is also set in London. At that time, London was still the centre of an empire and this important as the story involves aspects of modernism. Whereas the setting of The Signalman is important as Dickens goes to a lot of effort to make the story seem ghostly and surreal. Dickens was writing this story involving trains because they were the biggest and finest machines at the time and by writing the story to do with railway system he is challenging it. Dickens was also in a famous train crash. The Signalmans job is a job of life and death. The one in the story has a reputation for being good at the job. The signalman works in a cutting and that the descent into this place is described as if one is descending to the underworld of Greek Mythology. The clammy stone and that fact that it becomes oozoer and wetter helps create this sense. They key aspect of the cutting is its remoteness. The tunnel as well is described as having wet stains, suggesting that this is a place you would not want to visit. This helps to make an eerie atmosphere and makes it easier for us to imagine spirits and other ghostly aspects. The story is an intensely human story about psychological differences between two people whereas How it happened is about dealing with the physical and spirit world. The narrative voice in How it happened is in the first person and we tend to trust its honesty about the first person. This is because the narrator admits to not remembering everything clearly. I can remember some things upon that evening most distinctly, and others are like some vague, broken dreams. This is what makes it so difficult to tell a connected story. This openness suggests we are going to hear the truth. He also blames neither the car nor Perkins for events but himself. I also remember asking Perkins, my chauffeur, how she had gone, and his saying that he thought she was excellent. The ways he says, Perkins, my chauffeur tell us social standing and class of narrator. The narrator gains a ghostly aspect at the end, when we find out he is dead, and this introduces the idea of Spiritualism that is key to the story. Whereas the narrative voice in The Signalman is also in the first person and we find that until the end of the story we are not sure if we can totally trust it. This is because of the ambiguities in the description of things as well as the lack of information about the narrator himself. But we can tell the visitor is a sceptic. He chooses not to believe that the bell was rung by a ghost without proof. I caught at that. Did it ring your bell yesterday evening when I was here, and you went to the door? As readers, we side with the sceptic. The skill of the story is that most people will not agree the bell rang without sound. There is also an additional piece of irony, the sceptic doesnt believe in the ghost but he says the same things the ghost said like Halloa! Although he does tell us that he is a man who had been shut up within narrow limits until at last set free. But it is difficult to understand this because we dont know if hes referring metaphorically to something else or talking as if he has spent a long time in prison.

Science Investigatory Project Essay Example for Free

Science Investigatory Project Essay Dissatisfaction and discouragement are not caused by the absence of vision. Many things from afar are cannot be seen by the naked eye. Unlike cameras, eyes don’t have the capacity to magnify or zoom. In today’s generation, many people call for the use of binoculars but not everyone can afford. Due to this problem, the researchers decided to conduct this study â€Å"Improvised Binoculars out of worn-out gadgets.† To seek an alternative and affordable binoculars. Binoculars are a pair of identical or mirror-symmetrical telescopes mounted side-by-side and aligned to point accurately in the same direction, allowing the viewer to use both eyes when viewing distant objects. Most are sized to be held using both hands, although sizes may vary from opera glasses to large pedestal mounted military model unlike a telescope, binoculars give users a 3 dimensional image: for nearer objects the two views, presented to each of the viewer’s eyes from slightly different viewpoints, produce a merged view with an impression of depth. Modern binoculars consist of two barrel chambers with an objective lens, eyepiece and a prism inside. The prisms reflect and lengthen the light while the objective lenses enhance and magnify images due to stereoscopic vision. As telescopes were improved, binoculars evolved. Binoculars consist of an objective lens and eyepiece with two facing, right angle prisms arranged to invert and correct two facing, right angle prisms arranged to invert and correct the orientation of the image. The applications of binoculars are vast, ranging from being used in military operations to leisure activities. A must for bird-watchers and hunters, bi noculars are even used at sporting events by spectators who may be seated far from the action, thus using binoculars to get clearer and closer views of the action. Many tourist destinations around the world also have swivel-mounted binoculars to allow tourists to get better views of distant objects. In professional situations, militaries use binoculars for day-to-day operations. Binoculars are essential for them as with the binoculars, the military personnel would be able to spot enemies at a distant and take the necessary action. Not only that, they can also safeguard their territory and prevent and intruders from coming in. Their use, together with sophisticated 21st century technology makes the military much more efficient than it previously was. Statement of the Problem The main purpose of the study is top produce a simple improvised binocular. The researchers aim to answer the following questions: a. What are the methods to be used in constructing simple prism binoculars? b. Are binoculars a good magnifier? c. Compare the improvised prism binocular with commercial binoculars. Hypotheses * Null Hypotheses (Ho) There is no significant difference between the images magnified on the improvised prism binoculars and that on the commercial binoculars. * Alternative Hypotheses (Ha) There is a significant difference between the images magnified on the improvised prism binoculars and that on the commercial binoculars. Significance of the Study Binoculars are a handheld optical instrument composed of two telescopes and a focusing device, and usually having a prism to increase magnifying ability. Binoculars are used to view distant objects using both eyes. The applications of binoculars are vast, ranging from being used in military operations to leisure activities. A must for bird-watchers and hunters, binoculars are even used at sporting events by spectators who may be seated far from the action, thus using binoculars to get clearer and closer views of the action. Many tourist destinations around the world also have swivel-mounted binoculars to allow tourists to get better views of distant objects. An example can be the Grand Canyon, where tourists would not be able to see far away objects, thus these binoculars have been installed for the convenience of the tourists. In professional situations, militaries use binoculars for day-to-day operations. Binoculars are essential for them as with the binoculars, the military person nel would be able to spot enemies at a distant and take the necessary action. Not only that, they can also safeguard their territory and prevent and intruders from coming in. This will give the researchers an idea of making improvised prism binoculars. Some consider cans, lenses from worn-out gadgets and caps of plastic bottles as waste and there is nothing to do with them. But these materials can be a good raw material that has the potential in making improvised binoculars, which will help to see distant objects, instead of buying those expensive binoculars. This is the reason why the researchers will make an improvised prism binocular. Scope and Delimitation This study will only focus on making improvised prism binoculars from gadgets that are no longer in use or worn out. This study will show the steps and the procedures to make simple prism binoculars and show the comparison between the said binoculars and the commercial ones. II. A. Review of Related Literature History of binoculars Almost from the invention of the telescope in 17th century the advantages of mounting two of them side by side for binocular vision seems to have been explored. Most early binoculars used Galilean optics; that is, they used a convex objective and a concave eyepiece lens. The Galilean design has the advantage of presenting an erect image but has a narrow field of view and is not capable of very high magnification. This type of construction is still used in very cheap models in and in opera glasses or theater glasses. The Galilean design is also used in low magnification binocular surgical and jewelers loupes because they can be very short and produce an upright image without extra or unordinary erecting optics, reducing expense and overall weight. They also have large exit pupils making centering less critical and the narrow field of view works well in those applications these are typically mounted on an eye-to-eye glass frame or custom-fit onto eye glasses. An improved image and high er magnification can be achieved in binoculars employing keplerian optics, where the image formed by the objective lens is viewed through a positive eyepiece lens (ocular). This configuration has the disadvantage that the image is inverted. Porro prism binoculars are named after Italian optician Ignazio Porro who patented this image erecting system in 1854 and later refined by makers like the Carl Zeiss Company in the 1890’s. Binoculars of this type use a porro prism in a double prism Z-shaped configuration to erect the image. This feature results in binoculars that are wide, with objective lenses that are well separated but offset from the eyepieces. Porro prism designs have the added benefit of folding the optical path so that the physical length of the binoculars is less than the focal length of the objective and wider spacing of the objectives give a better sensation of depth. Thus, the size of the binoculars is reduced. Binoculars using roof prisms may have appeared as early as the 1870’s in a design by Achille Victor Emile daubresse. Most roof prism binoculars use either the Abbe-Koenig prism (named after Ernst Karl Abbe and Albert Koenig and patented by Carl Zeiss in 1905) or Schmidt-Pechan prism (invented in 1899) designs to erect the image and fold the optical path. They have objective lenses that are approximately in line with the eyepieces. Binoculars tend to come in two main styles, the Roof Prism and the Porro Prism design, both have their unique advantages and disadvantages over each other and so often it will be down to your specific needs and preferences as to which you should choose. Roof Prism Binoculars one of the two main styles of binoculars is the Roof Prism (the other being Porro Prism), this refers to the type of prism used in their construction. In this design the prisms are aligned with each other in a straight line, and thus they tend to be sleeker and more compact binoculars than the Porro prism design. You can easily identify a roof prism binocular as the eyepieces and the large objective lenses line up with each other. Roof Prism Binoculars Advantages: * Compact Design * Less internal parts than porro prism design, so less to go wrong and easier to make dust and waterproof. Disadvantages: * The image quality of roof-prism binoculars can suffer slightly because of the aligned prisms, although the top models of the roof-prism and porro-prism binoculars are now generally considered to have equal optical quality. To be really good, roof prism binoculars have to be in the high price range. Do not attempt to economize on roof prism binoculars. * Good for Ideal general use binoculars that can be used for bird-watching, wildlife viewing and at sporting events. Porro Prism Binoculars It is easy to identify a Porro Prism binocular because the eyepieces and the objective lenses are offset from each other (objective lens is not in line with the ocular lens), this is because of the design of the prism (porro) used in its construction. Advantages: †¢ Porro prisms have objective lenses spaced wider than roof prisms, and so can produce a slightly better stereoscopic image than the roof prism design. †¢ Cheaper to make quality porro prisms than roof prisms so they tend to be cheaper to buy. Disadvantages: †¢ Less compact design than roof prism binoculars †¢ More moving parts, more to go wrong and harder to make fully water and dust proof. Good For Like the roof prisms, porro prism binoculars make perfect general use optics ideal for things like bird-watching, wildlife viewing and at sporting events. Review of Related Studies Creating Binoculars The prismatic telescope is an astronomical telescope plus a pair of prisms for erecting the image. The most common example of this type of construction is the binocular instrument. One half of a binocular is a monocular. Some telescopes are used for a specific purpose and are named accordingly. A typical example is a spotting scope, which is used to view the target in rifle shooting. Prisms: Prisms are polished, angular pieces of glass, the kind commonly used in telescopes being 45-45-90-deg. prisms. The long side is the face, while the two short sides are the reflecting surfaces. The size of the prism is the width of the face Made specifically for telescopes, the prisms are grooved across the face in order to make a definite dividing line and avoid ghost images which would be caused by overlapping rays at this point. The ends are usually rounded to conserve space. The prime advantage of the prism erecting system is compactness. It adds somewhat to the bulk of the instrument but shor tens the length considerably. The prism glass has an elusive quality of brilliance but actually the light loss through the two prisms is somewhat greater than through the two erecting lenses of a lens erecting system. The 23X prismatic spotting scope This design calls for a 20-in. focal length objective, which, with a 22-mm. focal length eyepiece (from Army 6X), gives 23-diameter magnification. Prisms are 1-in. face. The scope body is of wood construction in simple box form. The first prism, the one the light strikes first, is located in an upright position at the back of the box; the second prism is mounted flat on the box bottom. Plywood spacers hold the prisms in place and also provide for the passage of the cone of light admitted by the objective. The eyepiece is fitted in a threaded mount. This type of focusing is satisfactory at set distances but is much too slow for general use. If you want this scope for general observation, it should be fitted with spiral focusing like the 10X monocular to be described later. It would also be practical to focus with a simple draw tube system. The principal point of the construction is to get the various holes lined up square. Use prism center lines as a guide and locate all holes from one master pattern drawn on cardboard Base on which the floor flange is mounted pivots on a carriage bolt and is tilted by means of a tilting screw. Designing- prismatic telescopes Designing your own prismatic telescopes follows much the same procedure as used for astronomical and terrestrials. Primary consideration should be given the objective and eyepiece. The prisms contribute nothing to the magnification; therefore, the power you want must be obtained entirely by the ratio of FO to FE. Prisms should be of such a size or so located as to receive the full cone of light from the objective, although it is practical to sacrifice extreme edge rays. The layout (at top of drawing) is what you make to determine the size and location of prisms and also the general overall dimensions. In this example, the objective has a 52-mm. diameter by 193-mm. focal length (from Navy 7X binocular) and the prisms are 1-in. face (from Navy 7X). As used by the Navy, this glass has a 27-mm. eyepiece, which gives a magnification of 7 diameters. If you want higher magnification, you have to use a shorter focus eyepiece. The Army 6X binocular eyepiece, 22 mm, could be used and would giv e you 9X. The eyepiece shown uses an Army binocular eye lens, but a shorter focus field lens, the combination giving 20-mm. focus, hence, about 10X magnification. The preliminary calculation should determine the exit pupil and luminosity. This glass has excellent illumination at 92 percent. However, Don’t get the idea that the 13 percent rating of the 23X spotting scope is hopeless—13 percent is a good value for anything over 20X magnification. It is worth mentioning here that prism instruments are often rated for illumination on the basis of the exit pupil squared. Thus, if the scope has a 5-mm. exit pupil, it would be rated 25. Using this calculation, the 100 percent standard would be the normal size of the eye pupil, squared: 25 for daylight and 49 for night. Bench setup Set up the objective and focus on well-lighted copy or a bare light bulb, not less than 20 ft. from lens. Use tracing or waxed paper as a ground glass to pick up the image as in Fig. 49. Measure the distance from the rear side of the objective to the image plane. Start your layout and transfer this dimension to the layout. Next, put the two prisms face to face and move the assembly back and forth until you pick up a sharp image of the copy or light bulb. Measure the distance to the face of the first prism and set off this distance on your layout, now you will note that the distance the light travels through a 1-in. prism is 2 in., a total oX 4 in. for both prisms. Set off this distance, C, on your layout to establish the back image plane. Determine the image size. In this instance, the multiplying factor is .070, and this figure multiplied by the focal length of the lens (7% in.) gives .53 in. for the image size. Call this Ha in. for an even figure and mark the image size at the normal image plane and again at the back image plane, as indicated by L. Draw lines K and M representing the marginal rays and the full cone of light. Your prisms must catch the marginal rays K and also as much of the weaker edge rays as possible. The best way to determine prism-placement is to make -two 1 by 2-in. oblongs of cardboard or celluloid. Manipulate these over your layout. The forward edge of the first oblong represents the face of the first prism. You can tell at a glance how far forward you can push it and still pick up the marginal rays. The distance between the two oblongs is the spacing between the prisms. The distance between the back edge of the second oblong and the back image plane must be sufficient to permit focusing. What you finally arrive at in this case is D, %s-in. allowance for the distance the image plane will set inside the eyepiece tube; E, % in. for focusing travel; F, %-in. prism spaci ng; G, 2 in., the distance through the second prism; H, %-in. prism spacing again, coming back; I, 2 in. for the first prism, arriving at J,-the face of the first prism. This may sound complicated, but it is really very simple if you are actually on the job. If desired, you can now draw an outline of the prisms. This shows both prisms flat; the same way you test them in the bench setup. At this point J, it will be noted that the face of the prism catches all of the marginal rays and about halfway out to the lines representing the full cone of light. As mentioned before, it is practical to sacrifice some or all of the weak edge rays, so that this placement of the first prism face is quite satisfactory. What next? Well, you know that the maximum cone of light you can catch on the first prism is 1 in. in diameter at J, so lines drawn from here to image size at the back image plane will establish guide lines for hole diameters needed to pass this same cone of light back to the image pla ne. These lines are marked N in the drawing, and O, for example, shows the diameter of the hole at the back face of the second prism. If you want to use one or more glare stops ahead of the prisms, the hole diameters are determined in the same way, as at P. Monocular construction You will need two wood blocks exactly 1 in. thick to house the prisms. The Vs-ia spacing between prisms is taken up by a spacer of %-in. plywood, and similar plywood pieces are used at the back and front of the housing. The whole thing is glued up like a triple Decker sandwich, the prisms being held securely in the cutouts and between the various layers. Work carefully to prism center lines. Be sure that prisms are exactly at right angles since any rotation here will rotate your image twice as much. Prisms must be spotlessly clean and polished. The eyepiece tube is 1 in. in diameter, this size permitting it to work alongside No. 1 prism; Focusing is by means of a spiral groove cut half way across the eyepiece. Shows the monocular partly assembled and also shows how the turning which joins the main tube to the prism housing is cut away to fit over the second prism covered with a gray pebble-grain oilcloth. General notes Cut the main tube long when making any prism telescope. Check the final position of the objective by actually using the instrument; run the eyepiece in as far as it will go and then place the objective so that distant objects are in focus. Then the full focusing range is available e for picking up nearer objects. The 23X spotting scope £ will focus down to about 40 ft.; the 10X monocular to about 30 ft. or even 20 if you want to make it that way. If you use spiral focusing, it is necessary to know in advance how much you will need for focusing. This travel will be very short with a short focus lens, but much longer with a long focus objective. Allow % in. for lenses less than 10-in. focus; % in., up to 14-in. focus; 1% in. at 18 and 1% in. at 20. These allowances will let you focus down to 30 or 40 ft. in all cases, -possibly closer. When you make a bench setup at close range , remember that this represents the maximum extension of your telescope. If you make a bench setup by focusing on a distant object (this is advisable if you are using an objective of over 20-in. focal length) the setup will represent the telescope at its shortest draw. The Kellne r type of eyepiece gives best results with all prismatic instruments. The objective should always be a cemented achromat. If the lens is not cemented l^^^^^^^ M when you get it, you can dummy test it by cementing with glycerin. Final cementing should be done with Canadian balsam; i n a pinch you can use a good grade of water white (clear) lacquer. The diameter of the objective controls the luminosity of the telescope. The diameter of the objective does not control the field of view; except in the Galilean instrument, you can see just as much through, a small objective as a large one.

The 4g Wireless Networks

The 4g Wireless Networks The current system has very limited services; 4G is going to be The Technology which is going to be highly in demand. With the developing of 4G this power can be utilized to its fullest potential for various people in different walks of life. This is will help the military services of any nation to a great extent as the video clarity and data transfer speed will help the uniformed men in the war front. Likewise for the corporate this is a boon as they can have virtual offices all over the world and monitor their business by sitting in one corner of the world. And even for the personal use it is of great help to the people as it has the better quality of service, connectivity and also helps the people in all the fields. This fourth generation helps us to gather all kinds of information which is needed without any difficulty. This 4G has lots more benefits when compared to the 3G and it also provides better service to the people in a high level. Introduction: The wireless technologies evolution has many generations such as 1G, 2G which is of wireless cellular system. The wireless systems which are currently in use provide only limited services. The users of 2G and 2.5G are asking for better quality in data, multimedia and voice similar to the quality of the wired. But the data rate required for it is very high, which is also beyond the 3G capabilities. This motivated in the research of the Fourth Generation wireless network s (4G). The 4G vision unifies many mobile and the wireless networks. Anyway, there is a basic difference to the wireless cellular and the WLANs. The wireless networks in the fourth generation will have different networks and it will overlie one with the other. The mobile station which has multiple interfaces will be fully equipped which will enhance its mobility. The 4G wireless networks will have different kinds of wireless components which will provide large number of service to the users, so that the people can communicate with the help of these networks and architecture. The 4G wireless networks are very flexible and will provide wide range of technology to the users. They will not only be able to use the internet services but also will be able to use the other services like voice and some other day-to-day applications. They not only help in improving the services but also help us to obtain wide range of information and services. Requirements: The 4G is a safe and secure platform and many services can be made use of it. It gives the complete satisfaction to the users. Low Handoff: This handoff will cause the delay in the services and it will also create loss to the communication of the data. Hence this should be managed for the better communication. Access: The access is the important thing in the 4G networks as it gives connectivity to the users and it also provides the end services. Network: The network should be of multi-service so that it will not only give the basic access but also gives a wide range of services to the people who will need voice and other services. Broadband: The 4G network integrates using the high end platform and it is also cheaper and effective to use, and it can be maintained easily. Security service: For success of 4G, the important aspect is security and to make sure that the networks are safe and protected. Models: The 4G has different range of models and it can be made use as required. Optimal networks: In this, according to the agreement the optimal network for the service is selected and the connectivity is selected based on the internet network layer. Hybrid networks: The core layers will be present and the layers will have networks of different kinds which will be presented layer below layer. Heterogeneous networks: This deals with different and all kinds of networks which has one common network. When the core layer is the same it minimizes the overheads and will also improve in the performance of the network. The fourth generation wireless network comprises 4 basic layers. They are Wireless Wide Area Network (WWAN), Wireless Metropolitan Area Network (WMAN), Wireless Local Area Network (WLAN), and Wireless Personal Area Network (WPAN). WPAN Networks WLAN Networks WMAN Networks WWAN Networks The networks of the lower levels has high bandwidth and play a small area of networking and sometimes the networks of the lower level can play the role of the networks in the higher level. The WPAN has the shortest network connectivity. It has connection only to the personal needs like; the Bluetooth can be used with it. It covers only a relatively short distance. The WLAN also covers a short area, but more than the WPAN. It covers the local area. For e.g. the use of internet in an area. The WMAN covers more than the WLAN. It provides communication between a metropolitan area. The WWAN is the wide area but it does not have a very high bandwidth. The use of cellular, GSM can be accessed with this network. Wireless Fourth Generation Architecture: Inter Technology Hybrid Unit (HU): This hybrid unit acts as a bridge between the different layers. It combines many networks to access different technologies. The hybrid units are of different types, they are: WWAN-WMAN: This node provides a link between the WWAN and the WMAN network. For the WWAN it can act as the base station and for the WMAN it acts as a subscriber station. WMAN-WLAN: For the WLAN this unit acts as an access point, and for WMAN, it is the subscriber station. WLAN-WPAN: The networks WLAN and WPAN will be interconnected using this unit. It can operate the Bluetooth the ad-hoc networks. The main components of the cellular networks are the Mobile Switching Center (MSC), Home location Register (HLR), Serving GRPS Support Mode (SGSN). Properties of 4G: Network Architecture: It has Hybrid network architecture. Driving Architecture: It has converged data and voice over IP. Switching: It has digitalized switching with packetized voice. Radio Access: MC-CDMA, OFDMA. Database: ELHR, VLR, EIR, AuC. Data rates: It has data rates of 100Mbpsc. Roaming: It has global roaming. Compatible: It is compatible to 3G. Handsets: Numerous mode voice, data streamed video with higher data rates. Applications: Internet, MMS, Multimedia, HDTV M TV Bandwidth: It has bandwidth of 100MHz Frequency Band: It has higher frequency bands of 2-8 MHz Component Design: It has smaller antennas, software multiband and wideband radios. FEC Tech: It has concatenated coding scheme. IP: All IP (IP6.0) As the wireless communication system develops the expectations and the demand among the people keeps increasing. These wireless networks work on their capacity and limits also has some crucial period. The re-configurability can be done at any level, and it will be useful for the network provider as well as the user perspective. This provides selection between the alternate networks and is based upon all the issues. The re-configurability mechanism tells not only about the physical layer but also the stacks of the entire protocol. These 4G systems will provide many features to the users and it will provide end-to-end connectivity. The accessing, roaming and the other dynamic features are very useful and everything is obtained at a minimal cost. They can also choose between the other wireless networks if required. The following figure shows about the interoperability of the 4G layers. The 4G networks usually support the global roaming and the end-to-end services in the wireless networks, and these thing usually depend upon the Quality of Service issues (QoS). The capacity and the bandwidth for the 4G should be many times more than that of the 3G to meet the business requirements. The 4G depends not only upon the speed and version but entirely for its service and the quality. The main difference between the 4G and the previous generations is that in 4G both the voice and data can be sent, but in the other generations the voice and only a small amount of data can be sent across. The 4G can be used wireless with the Digital Subscriber line (DSL). The people throughout the world would be benefited and can use for communication, as its service and quality are very good. They can even do business from one part of the world to the other as it has good speed and is reliable. The people who have not yet used the 3G can directly hop on the 4G as it is more useful and of good speed. It will be based on the network IP technology. 4G is more useful than Wi-Fi. In Wi-Fi the distance matters and it can be accessed only in the slow path. But this 4G is faster and it can be accessed from any place and it is also cost-effective. Quality of Service: The quality of service plays a very challenging role in the 4G networks. It provide a wide range of service and a better quality to the users. There are 4 types of quality of service, they are: 1. Packet- level Quality of service: This QoS refers to the packet level service which also takes care of the error rate, and the space occupied by the buffer. It has a good packet quality which is very helpful to the users. 2. Transaction level Quality of Service: This transaction level depends on the transaction time it takes to complete a service and also about the packet loss. Some of networks can accept the packet loss but the others cannot. 3. Circuit level Quality of Service: The circuit level service is about the calls which have been connected and also about the circuit level transfer and other transactions. It provides a good quality of service for the calls and services. 4. User-level Quality of Service: The user level quality depends upon the application and the other services. It also depends upon the mobility of the users which may support the quality of the network. Conclusion: 4 G is developed with the following aspects and advantages: Ità ¢Ã¢â€š ¬Ã¢â€ž ¢s speed would be 50 times high than 3G. The expected bandwidth of 4G is about 10Mbps. It has options of three-dimensional virtual reality, video and the ability to feel at the event even if you are not present physically there. We get to interact with people, products and know about the places when the cyber and real world merge. The smart card in your mobile would advice you to do what next as it will be monitoring your movements. Last but not the least 4G will provide access and support for authentication, paying off bills, security and also supports whichever has mobile specific services.

A Comparison of Edgar Allan Poe’s Annabel Lee and The Raven Essay

A Comparison of Edgar Allan Poe’s Annabel Lee and The Raven With insistent meter and captivating rhyme schemes, Edgar Allan Poe’s â€Å"Annabel Lee† and â€Å"The Raven† are both very similar. However, in their views of love, namely the loss and mourning of beautiful women, they differ greatly. Through analysis of the two poems, the reader observes that whom Poe had chosen for a speaker, the tone and the sound effects are all factors in both poems that make two poems with a similar theme contrast. Both poems mean the same thing and follow the same theme or â€Å"melancholy topic† as Poe called it in his essay. They both depict a speaker who is severely depressed over the death of a beautiful woman. Poe gave a sense of madness in their character, though, which made them obsess and think constantly... A Comparison of Edgar Allan Poe’s Annabel Lee and The Raven Essay A Comparison of Edgar Allan Poe’s Annabel Lee and The Raven With insistent meter and captivating rhyme schemes, Edgar Allan Poe’s â€Å"Annabel Lee† and â€Å"The Raven† are both very similar. However, in their views of love, namely the loss and mourning of beautiful women, they differ greatly. Through analysis of the two poems, the reader observes that whom Poe had chosen for a speaker, the tone and the sound effects are all factors in both poems that make two poems with a similar theme contrast. Both poems mean the same thing and follow the same theme or â€Å"melancholy topic† as Poe called it in his essay. They both depict a speaker who is severely depressed over the death of a beautiful woman. Poe gave a sense of madness in their character, though, which made them obsess and think constantly...

Building Our Future, One Student At a Time :: Education Teaching Teachers Essays

Building Our Future, One Student At a Time There have been many influences on my life. Some have been positive and some have been negative. But, the biggest influence on my life was luckily a very positive one in the form of numerous caring, motivated, intelligent people. You may ask who these people were. They were simply my teachers, and they are the main reason for my career decision. I am in full agreement with Rousseau in his belief that we are all born innocent. That we are neither good nor evil, but rather the environment in which we are influences this. That is why being a good teacher is important. I really and truly feel that the greatest influences on a child, aside from their parents, are their teachers. These are the people that teach children the knowledge and skills that they will use most in life. For example, they teach students how to read, how to do mathematics, how to analyze information, and how to apply the things that they have learned to their everyday lives. Teachers are around the student, in some instances, more than the parents. Therefore, the teacher’s impact on the student is tremendously great. Teachers have to be a number of things all rolled up into one neat package. First and foremost, teachers must be great role models for their students. The teachers have to be role models not just in their words, but also in their actions. If there is one thing I’ve learned from being in different school settings and around numerous children it is that children are very observant. They notice all the little things that you don’t even realize you are doing. So, if you are doing the things you are trying to instill into the children, you establish a trust with them and they see that these aren’t just words that you speak, but they are actually things that you know, believe in, and above all else practice in your own life. This constant role model status also helps you be a better person as you mold the lives of our future. Teachers also have to be disciplinarians. They have to set boundaries and rules for the students and enforce them without a drop of prejudice.