Candide - All Is Not For The Best Essays - Candide, Operas

Candide - All is Not for the Best Voltaire's Candide is the story of an innocent man's experiences in a mad and evil world, his struggle to survive in that world, and his need to ultimately come to terms with it. All people experience the turmoil of life and must overcome obstacles, both natural and man-made, in order to eventually achieve happiness. In life, "man must find a medium between what Martin (scholar and companion to Candide) calls the "convulsions of anxiety" and the "lethargy of boredom"" (Richter 137). After a long and difficult struggle in which Candide is forced to overcome misfortune to find happiness, he concludes that all is not well (as he has previously been taught by his tutor, Dr. Pangloss), and that he must work in order to find even a small amount of pleasure in life. Candide grows up in the Castle of Westphalia and is taught by the learned philosopher, Dr. Pangloss. Candide is abruptly exiled from the castle when found kissing the Baron's daughter, Cunegonde. Devastated by the separation from Cunegonde, his true love, Candide sets out to different places in the hope of finding her and achieving total happiness. On his journey, he faces a number of misfortunes, among them being tortured during army training, yet he continues to believe that there is a "cause and effect" for everything. Candide is reunited with Cunegonde, and regains a life of prosperity, but soon all is taken away, including his beloved Cunegonde. He travels on, and years later he finds her again, but she is now fat and ugly. His wealth is all gone and so is his love for the Baron's daughter. Throughout Candide, we see how accepting situations and not trying to change or overcome obstacles can be damaging. Life is full of struggles, but it would be nonproductive if people passivel y accepted whatever fate had in store for them, shrugging off their personal responsibility. Voltaire believes that people should not allow themselves to be victims. He sneers at naive, accepting types, informing us that people must work to reach their utopia (Bottiglia 93). In Candide, reality and "the real world" are portrayed as being disappointing. Within the Baron's castle, Candide is able to lead a Utopian life. After his banishment, though, he recognizes the evil of the world, seeing man's sufferings. The only thing that keeps Candide alive is his hope that things will get better. Even though the world is filled with disaster, Candide has an optimistic attitude that he adopted from Dr. Pangloss' teachings. In spite of his many trials, Candide believes that all is well and everything is for the best. Only once, in frustration, does he admit that he sometimes feels that optimism is "the mania of maintaining that all is well when we are miserable" (Voltaire 41). Candide's enthus iastic view of life is contrasted with, and challenged by the suffering which he endures throughout the book. Voltaire wrote this book in a mocking and satirical manner in order to express his opinion that passive optimism is foolish (Richter 134). Candide eventually learns how to achieve happiness in the face of misadventure. He learns that in order to attain a state of contentment, one must be part of society where there is collective effort and work. Labor, Candide learns, eliminates the three curses of mankind: want, boredom, and vice. In order to create such a society, man must do the following: love his fellow man, be just, be vigilant, know how to make the best of a bad situation and keep from theorizing. Martin expresses this last requirement for such a society succinctly when he says, "Let's work without speculating; it's the only way of rendering life bearable" (Voltaire 77). One of the last people that Candide meets in his travels is an old, poor Turkish farmer who teache s Candide a lesson which allows him to come to terms with the world and to settle down happily. The revelation occurs when Candide and his friends hear of the killing of two intimate advisors of the sultan, and they ask the Turkish farmer if he could give them more details about the situation. "I know nothing of it, said the good

Global Warming as a Social Problem Essays

Global Warming as a Social Problem Essays Global Warming as a Social Problem Paper Global Warming as a Social Problem Paper Essay Topic: Global Warming Renewable energy While most commonly thought of social problems are based on discrimination and stereotypes, one specific social problem that does not fit into these standards s global warming. Global warming is an increase in earths average atmospheric temperature that causes corresponding changes in climate That may result from the greenhouse effect (Dictionary-corn). As a social problem, global warming is a fairly large and broad topic. The greenhouse effect is an environmental condition caused by excessive quantities of carbon dioxide, water vapor, methane, and nitrous oxide in the atmosphere. These definitions are simply physical definitions. In terms of being a social problem, global warming and the greenhouse affect yields harmful effects on every community and society s a whole. This type of social problem does not choose its victim based on race, gender, sexual orientation, class, income, age, or any stereotypical category a person can be placed in. Not every person is equally affected by this, but everyone is susceptible to dealing with this problem. The greenhouse effect is a factor in causing global warming. Global warming is caused by many factors and different kinds of pollution. The main type of pollution that affects global warming is air pollution. Air pollution is simply defined as pollution of the atmosphere, which ties in with the greenhouse effect. Air pollution can also be defined as the addition of harmful chemicals to the atmosphere. The most serious air pollution results from the burning of fossil fuels, especially in internal-combustion engines (Dictionary. Com). Air pollution, along with any other type of pollution are mostly caused by humans actions. The way people live today, and how they use their resources in daily life results in everyday pollution. Pollution can be considered as an undesirable state of the natural environment being contaminated with harmful substances as a consequence of human activities (Dictionary. Com). People may not realize this, but their actions directly affect their surroundings. Completing daily tasks such as driving a car has detrimental effects on Earths atmosphere and pollution levels. Global warming causes physical harm to humans, animals, and plant life. A change in the Earths climate could be detrimental to the Earths life. The physical harm that is inflicted on all of living life due to global warming poses as a problem: a social problem. : Global warming does not choose its victim based on any type of criteria such as race, age, gender, sexual orientation, class, income, or any stereotypical category. Global warming poses as a social problem by affecting a significant number of people, and by threatening the stability of the communitys environment. Since pollution is one Of the main factors in causing global warming, it also comes with health effects. These effects range from being short-term to being long-term. Short-term effects can be as simple as headaches nausea, and allergic reactions such as irritation to the eyes, nose, and throat. Infections such as bronchitis and pneumonia can also occur. An example in history of health effects from pollution can be found in the Smog Disaster in 1952 located in London. In this Smog Disaster a total of four thousand people passed in only a few days. The death of these civilians was due to the high concentrations of pollution (Paraphrased from Lb. Gob). Long-term health effects include chronic respiratory disease, lung cancer, heart disease, and even damage to the brain, nerves, liver, or kidneys (Lb. Gob). Research has shown that younger children and elderly people are more sensitive to pollution compared to the general public. Continual exposure to air pollution affects the lungs of growing children and may aggravate or complicate medical conditions in the elderly (Lb. Gob). Young hillier and elderly people often suffer more from the effects of air pollution (Lb. Gob). With global warming not being in full affect, the extents of the effects are currently unknown. The effects of global warming are only just beginning with mild winters and extremely hot summers. The climate change can be subtle or dramatic depending on how quickly it occurs. The increase in temperature in the climate either way will be harmful. With temperature increases ice caps in the Artic and Antarctica are melting at increasing rates. The melting of ice caps can have many changes includes the destruction of the habitat in the Artic as well as rising sea levels. Global warming could push sea levels about 40 percent higher than current models predict (Encephalographic. Com). Models suggest that by 21 00 sea level[s] will be between four and thirty-five inches Geiger than it was in 1990 (Encephalographic. Com). Ocean front properties and beaches can be destroyed and submerged in water because of these rising sea levels. The higher the temperatures and climates increase, the faster the sea levels will rise. A comparison of this at a minor scale could be like a house built in a flood plain next to a river. The more it rains the Geiger the water will rise. If the water rises to high, it will flood the flood plain, and destroy the house. Coastal areas will be affected similarly. A person could think of the coastal areas as a flood plain for the oceans. Ice caps melt from the rising temperatures, as the water heats up (even just slightly), the water will begin to expand. As the water expands the sea level will rise. Solutions to global warming and its effects range vastly. There are several different types of solutions ranging from micro-level solutions to macro-level solutions. Solutions can range from fuel-efficient vehicles to more environmental laws. Solutions to global warming may not fully diminish the problem, it may only reduce it. Renewable resources could play a main role in the solutions to reducing global warming. A key point is that if we were to switch to renewable resources it would cost the government a lot of money, which could result in higher taxes or some other means of obtaining the necessary amount of money. A plus to using renewable resources is the fact that in the long run they would pay for themselves. Not only would it provide jobs for the people who would be forced to leave the nonrenewable resources, it would also be opening up opportunities for the unemployed. Along with making our environment a safer and more hazard free living zone, wed also be leading towards a better economy. Our current economy state is negatively thought of, and switching to nonrenewable resources could put our government in debt. After so many years renewable resources will not only repay its own debt, but it will also produce a profit. The term renewable resources are relating to a natural resource, such as solar energy, water, or wood, that is never used up or that can be replaced by new growth. Resources that are dependent on Rexroth can sometimes be depleted beyond the point of amenability, as when the deforestation of land leads to desertification or when a commercially valuable species is harvested to extinction. Pollution can also make a renewable resource such as water unusable in a particular location (Dictionary-corn). The future problems dealing with global warming will lead to such massive problems that a solution and change will be demanded. Global warming is a social problem because of the public outcry that is already occurring. The state of our current economy is negatively thought of. If we were to invest in new solutions for global warming it would be a great cost. If we were to pay or the projects to reduce global warming that we believe will have an effect may put our country in great debt. If the country were to switch to fuel- efficient and renewable resources in all institutes and factories it would be a great cost. A good way to evaluate the methods of our solutions to global warming would involve technology we already possess. Measuring CO levels in the atmosphere and the amounts of trash and liter in our surrounding environment in comparison to the current and predicted conditions would only be a start. Actually comparing climate conditions to the predicted conditions would be a good evaluation.

New Media Marketing and Online Ordering Form Essay

New Media Marketing and Online Ordering Form - Essay Example Thus, the institutions that are undergoing with the effective projections and development are noted to be trying to adopt the diverse changes evident within the system and increasing the prominence. Hence, the need for maintaining the social development based on the technical advancement and other attributes there is a huge needs of maintaining competitive edge by successful adoption of technology in a progressive manner. Online ordering has evolved in a more appropriate manner for developing the overall attributes within the domain of globalization. With the effective development and progression within the social system, the concept of media marketing and online ordering has changed from luxury commodities to necessity. The progression within the social lifestyle and development of technology has initiated the effective development associated with the progression of social development. With the need of progression, social media has been included within the diverse field and has become one of the prominent recourses that supports social progression and effectiveness of the media needs. Integrated approaches of the social system and the rapid progression within the domain of socialization has enhanced transparency and increased effectiveness of the system. Increase on the dependency on technology and time constraints among the people has increased the involvement of new media in marketing (Peltola & M akinen, 2014). With this regard, the essay intends to elaborate on the new media that is associated with marketing and development of ordering forms for meeting the needs of technology savvy consumers. Technological advancement and progression within the system of media management has incorporated a contrasting view in the marketing and ordering online domain. This strategic integration is often noted to possess a very adverse impact on

Request for proposal Research Example | Topics and Well Written Essays - 1000 words

Request for - Research Proposal Example The firm is seeking an appropriately qualified contractor to provide a â€Å"turnkey† solution of an Integrated Information system that will cover the operation and business needs of the business. Your firm is invited to submit a proposal for undertaking the work described in this Request for Proposal (RFP). The IT system to be delivered by the contractor must fully cover the business needs of the restaurant business. Following are described the main components of the system, which include the Ordering (POS) application, the back office/finance subsystem and the website application. Ordering Application (POS System). The POS system will provide a full flow of a customer orders from the time they are ordered, until the final bill issuance. The waiter must be able to register the order of the customer, and pass it via the restaurant wireless network to the kitchen. Kitchen personnel will receive the order and start preparing the food. Waiter in charge of the order must be informed with a message when the order is ready, and will serve it to the customer. In that way no time will be missed at all as the waiter can be busy with many orders in parallel without having to be all the time close to the kitchen, waiting for the food to be served. At the time when the customer asks for the bill, waiter sends a message to the central computer system. The receipt is automatically printed by the POS portable device printer and is delivered to the customer, so that the waiting time for bill issuance is minimal. The POS system must support 5 waiters, and should be expandable t o 15. POS application must have a graphical interface that will display a plan of the restaurant at any time, so that the waiter is able to easily select and monitor the orders of each table in a convenient way. In addition, POS application must support a user friendly menu table, as

The Impact of Transformational Leadership On Organizational Innovation Research Paper

The Impact of Transformational Leadership On Organizational Innovation Moderated By Organizational Culture - Research Paper Example The changes in the global economy is yet another factor which is pressurizing the organizations as well as the leaders to develop and implement effective measures to ensure better and higher employee productivity, inspire innovation and create a favorable organizational environment and culture that supports and encourages employee creativity. Such transformations can be made through effective transformational leadership approach on the part of the management. There is documented evidence on the basis of various studies conducted over the years which point to the fact that transformational leadership plays a key role in bringing about revolutionary changes in the organizational environment and positively affects and influences various key areas such as: organizational productivity, employee creativity, increased job satisfaction, reduction in stress levels of employees and workers, greater levels of team commitment etc., among many others (Bass & Avolio, 1994; Bass, 1985; Dionne, Yamm arino, Atwater & Spangler, 2004; Howell & Avolio, 1993). Such studies suggest that transformational leadership can greatly influence and encourage organizational innovation and creativity as well as the development of appropriate and effective skills required to compete in this highly dynamic and ever changing external environment. There are various approaches to initiate and implement organizational change, however regardless of such approaches the key role in influencing such changes is played by the managers and leaders, who are required to influence and guide the employees through such a process. Organizations today are representative of a highly diverse... This essay stresses that the study of various theories and researches with regard to the impact of transformational leadership on organizational culture and innovation provide an insight into the role of leaders in managing change and influencing the employees to achieve higher performance outcomes. On the basis of the extensive research and studies carried out in this behalf, it can be safely claimed that transformational leadership has a direct impact on organizational innovation, culture, and vision. It instills various characteristic traits among the employees and followers such as a sense of commitment to team efforts. This paper makes a conclusion that furthermore studies and empirical research have pointed to the impact of transformational leaders on organizations in terms of building a strong and positive culture, indicating that such leadership style provides better opportunities to the leaders to influence their followers and building an environment which is effective in achieving the overall goals. The studies also suggest that there is a direct and positive relationship between transformational leaders and the organizational vision. The transformational leaders encourage innovation and provide a conducive environment to innovate and develop novel ideas to respond to the dynamic and rapidly changing external environment. Such a culture further helps in creation of new and long term visions for the organization which in turn helps it in sustaining its competitive positioning in the market by giving them a competitive edge.

Method for Measuring the Area of Radiometric Apertures

Method for Measuring the Area of Radiometric Apertures ERREIRA DA   Method for measuring the area of radiometric apertures using the ratio of Gaussian beams I propose and demonstrate a method for determining the area of radiometric apertures using the power ratio between Gaussian beams. The result relies on measuring the power of an optical beam of known radius with and without the radiometric aperture. The impact of the characterization of the laser beam and of the radiometric measurements on the area estimation is discussed and a 3-mm in-diameter sample is measured for validation. The contactless method is fast and simple and results in a relative uncertainty of 0.12%.   Calibration of the area of an aperture is necessary for radiometric and photometric measurements, including spectral irradiance [1- 4] and the realization of the SI unit candela [5-7]. The plethora of methods reported in literature can be assorted whether they are contact or contactless. Contact methods include probing the aperture border with an stylus, which position is mapped by an interferometric system [8]. Contactless methods are preferable as the possibility of damaging the sharp edge of the aperture during the measurement is avoided. A camera with an objective lens can be used for taking digital pictures of parts of the inner perimeter of the aperture, while an interferometric system is used for measuring the displacement of the images, allowing them to be further stithed together [9]. Another approach consists in raster scanning the aperture relative to a laser focused in a small spot in the aperture plane to determine the diameter at some radial angles [10]. Methods based on radiometric ratios have also been reported and depend on comparing measurements performed with a light overfilled aperture and a reference value. A spatially-uniform beam emerging from an integrating sphere can be used to compare the radiometric values obtained with the aperture under calibration and with the reference one [11]. Similarly a matrix of small-spot laser sources can be used [12, 13], with the reference provided by the known uniform irradiance distribution. In this paper I propose a method for determining the area of a radiometric aperture using the ratio between Gaussian laser beams. The result is obtained from measurements of the optical power transmitted through the overfilled aperture compared to the total optical power without the aperture, with the beam radius at the aperture plane previously characterized. The technique is contactless and the measurement is relatively fast, providing an alternative way for measuring radiometric apertures. A. Model The method proposed for determining the area of the aperture is based on measuring the radiometric ratio between the beam limited by the aperture and the full beam. Consider a Gaussian beam propagating along the zˆ  axis with an intensity distribution in the radial direction à Ã‚  on the transversal plane described as I (1) where the beam radius à Ã¢â‚¬ ° (z) is [14] (2) and the waist radius is à Ã¢â‚¬ °0 = à Ã¢â‚¬ ° (0). The beam radii in the analysis are taken at 1/e2 of the maximum intensity. The total optical power of the beam is obtained by integrating its intensity over the transversal area as   Ã‚   Ptotal /2(3) The circular radiometric aperture is modelled as a Boxcar function with mean radius r à Ã¢â‚¬ ° (z) and transmittance given by g (x, y) = rect(4) Positioning the aperture in the plane orthogonal to the beam axis at à Ã‚ =0 reduces the measured optical power in eq. (3) to Z r Pap (z) =I (à Ã‚ , z) 2à Ã¢â€š ¬Ãƒ Ã‚ dà Ã‚ (5) 0 The ratio between the optical power limited by the aperture at position z and the total optical power of the beam is thus [14] (z)2r2 R(6) The radius of the aperture is obtained by inverting eq. (6), resulting in r (7) Equation (7) reveals the dependence of the aperture radius on the beam radius à Ã¢â‚¬ ° and radiometric ratio R measured at a given axial position. The sensitivity coefficients of the radius equation relative to those components are 2(8) (z) The uncertainty of the measured area is composed [15] as ur (9) The area of the radiometric aperture is then trivially obtained from the circle formula, S = à Ã¢â€š ¬r2, with uncertainty given by uS = 2à Ã¢â€š ¬rur. B. Method The first step of the method is the determination of the longitudinal profile of the Gaussian beam. This can be accomplished in practice by using the knife-edge scanning method [16] or using a spatially-resolving photodetector (for example, a CMOS or CCD camera). While the later can be troubling for beams wider than the sensitive area of the camera, the primer requires caution relative to radial asymmetries in the beam profile. The astigmatism of the beam must be verified by knife-edge scanning along orthogonal directions in the transversal plane and the mean radius is considered. The beam longitudinal profile reveals important information about the tolerance of the axial positioning of the aperture relative to the transversal plane where the beam is determined. Next step consists on positioning the aperture in the beam path. Carefully placing the aperture front plane at the axial position where the beam has been characterized avoids the need for a correction on the beam radius value. The aperture under measurement must then be centralized relative to the beam axis. A recursive gradient search can be performed along the plane axes until convergence at the maximum optical power, where à Ã‚ Ãƒ ¢Ã¢â‚¬  Ã¢â‚¬â„¢ 0. The value of the optical power measured with the aperture is compared to the total optical power measured without it. This ratio and the mean beam radius are substituted in eq. (7) and the aperture radius is determined. Research Article Applied Optics 2 A laser diode with continuous-wave emission at 633 nm is collected with an objective lens into a meter-long single-mode optical fiber (Thorlabs SM600 [17]), which acts as a spatial filter by selecting the LP01 transversal mode. The beam is launched into free-space through the tip of an FC-PC connector and collimated using an 1-large AR-coated plano-convex lens (L2) with a focal length of 38.2 mm, as illustrated in Fig. 1. A similar lens (L3) with 150-mm long focal length focuses the beam into the photo-detector. Fig. 1. Experimental setup. LD: laser diode; L: plano-convex lens; C: fiber connector; PD: photo-detector; PC: personal computer. The beam profile is determined using the knife-edge method. A pair of razor blades is scanned in the plane orthogonal to the optical beam in both xˆ  (horizontal) and yˆ  (vertical) directions, using a pair of linear actuators (Newport TRA25PPD and CMA25PP). The optical power is measured by an optical power meter with a diffuser probe (Thorlabs PM100). Data acquisition and transversal positioning of the knives and aperture are performed with a personal computer. Flip mounts allow for selecting either the knives or the aperture, which are placed in the same xˆ  à ¢Ã‹â€ Ã¢â‚¬â„¢ yˆ  translation stage. The translation stages, the lens L3 and the photo-detector are fixed into a platform and move together to the desired position in axial direction zˆ . The aperture under characterization has nominal diameter of 3 mm and is built in anodized aluminium with sharp edges. The offset distance between the planes of the knives and the aperture is set within 0.05 mm using a multi-probe optical reflectometer [18]. An automated routine is used to position the aperture in the transversal plane relative to the optical beam by scanning it along xˆ  and yˆ  directions until it is centralized. The radiometric ratio is obtained by removing and reinserting the aperture using the flip mount while the power is measured using a silicon photodiode (Hamamatsu S1227-1010BQ) in photovoltaic mode. Calibrated trans-impedance amplifier (LabKinetics Vinculum) and digital voltmeter (Agilent 34401A) are used. Conditioning the signals for using a single range of these devices avoids linearity issues. The detector typical linearity is better than 10à ¢Ã‹â€ Ã¢â‚¬â„¢5 [19]. A. Beam width The width of the Gaussian beam is determined at different positions along the axial direction in both horizontal and vertical axes. Figure 2 shows a sample of the transversal beam profile Fig. 2. Sample of the transversal intensity profile of the beam. The slices in the details cross the center and are Gaussian fit. The longitudinal profile of the beam is evaluated by applying the knife-edge analysis at different axial positions. The optical power measured as a function of the knife position in xˆ  direction is modelled as the integral of the Gaussian intensity, resulting in the error function: P (10) Equation (10) indicates that the measured power profile reveals the horizontal beam radius à Ã¢â‚¬ °x (z). The procedure performed along the yˆ  direction returns a similar result as a function of the vertical beam radius à Ã¢â‚¬ °y (z). Figures 3a and 3b show the power measured with the knifeedge method along both xˆ  and yˆ  directions, respectively. A group of 10 scans, with 0.25-mm steps, is taken at a given axial position. Data is interpolated to steps of 0.1 mm using piecewise cubic Hermite interpolating polynomials [20]. Non-linear curve fit (Levemberg-Marquadt method) is globally applied to data with the beam radius parameter shared by all curves in the group. The beam radius values as a function of the axial distance to the collimating lens are shown in Fig. 3c. Observe that the beam profile behaves linearly at the sampled axial positions. Fitting data with eq. (2) reveals the horizontal and vertical waists localized at about 3.3 m and 3.7 m, respectively. The slope of 10à ¢Ã‹â€ Ã¢â‚¬â„¢4 indicates that a positioning error between the knives and the aperture of 0.05 mm has negligible impact on estimated radius. The beam is slightly astigmatic (horizontal radius about 1% greater than the vertical one), so the average radius is computed from both horizontal and vertical radii as /2(11) B. Radiometric ratio The radiometric ratio is determined from five groups of measurement of the total beam power, alternated with four measurements of the power limited by the aperture. Interleaved measurements allows for data interpolation and avoids slow drift effects. Each measurement is composed by a group of 30 data points, corrected by the dark measurement. Three measurement were performed at each axial position. The calibration data of the trans-impedance amplifier and voltmeter are used for correction and considered in the uncertainty budget see next section. The average ratio of 0.3373 allows for performing both measurements (with and without the aperture) in the same scale of the amplifier and voltmeter. Keeping the measurement range of the equipment fixed avoids linearity issues, which must otherwise be corrected and could burden on the uncertainty budged. C. Aperture radius/area and uncertainty budget The aperture radius is computed from the measured values of à Ã¢â‚¬ ° (z) and R (z) using eq. (7). The result obtained at three different axial distances from the collimating lens are presented in Fig. 4a. The uncertainty budget for the radius measurement is presented in Table 1. The uncertainty of the beam width and power ratio are combined with the reproducibility of the measurement. The radius measurement is obtained from the global fit of the knife-edge scan measurements. The impact of the beam divergence is obtained by multiplying this value by the maximum axial offset between the knife-edge and the aperture plane. The beam width uncertainty is dominant over all other components. Improvements over this estimation would greatly benefit the final uncertainty. The repeatability comes from the statistics of the ratio measurements. Stability of the laser source is the major component and could be iproved using a further power stabilization closedloop. The amplifier and voltmeter uncertainties are obtained Fig. 4. Experimental results: (a) aperture radius measurements and (b) its final area. The reference values are certified results. Standard uncertainties represent k=1. Table 1. Uncertainty budget for the measurement of the aperture radius (relative values). Component Type Uncertainty (k=1) Radius measurements B 5.3 ÃÆ'- 10à ¢Ã‹â€ Ã¢â‚¬â„¢4 Beam divergence [mm] B 2.3 ÃÆ'- 10à ¢Ã‹â€ Ã¢â‚¬â„¢5 Trans-impedance amplifier B 6.3 ÃÆ'- 10à ¢Ã‹â€ Ã¢â‚¬â„¢5 Voltmeter B 5.5 ÃÆ'- 10à ¢Ã‹â€ Ã¢â‚¬â„¢5 Photodiode linearity B 6.2 ÃÆ'- 10à ¢Ã‹â€ Ã¢â‚¬â„¢6 Power ratio 0.00017 Reproducibility [mm] A 0.00027 Aperture radius [mm] 0.00062 from their calibration uncertainty and from the linear regression over the measurement range. The photo-diode linearity is taken from literature. The reproducibility is taken from the independent repetitions. Among other factors, it accounts for small room temperature variation (oC), different axial positions, and repositioning of the aperture center relative to the beam axis. The final relative uncertainty obtained for the measurement of area is 0.12%. The validation of the method is assessed by comparing the results to a certified value, as shown in Table 2. The certificates present a relative uncertainty (k=1) of 0.0065 mm2 for the area value and a calibration drift (rectangular distribution) between bi-annual measurements of 0.0410 mm2 is observed, composing a combined uncertainty of 0.415 mm2. Research Article Applied Optics 4 Table 2. Experimental results and validation (k=1). Measured area Certified Relative Normalized [mm2] area [mm2] difference [%] error 7.0056  ± 0.0087 6.998  ± 0.042 0.11 0.18 The relative error between the measured and certificated values is 0.11%, while the normalized error [15] is below unit, indicating the compatibility of the results. The coverage factor of the measurements, calculated for a confidence interval of 95.45%, is k=2. The area of an aperture impacts directly on the determination of some radiometric and photometric quantities. This paper presents a simple and fast contactless method for characterizing an aperture area through the measurement of radiometric ratio of characterized Gaussian beams. The model is presented and the measurement uncertainty budget is discussed. The results are validated and indicate the method as suitable for metrology applications. References       M. White, N. P. Fox, V. E. Ralph, and N. J. Harrison, The characterization of a high-temperature black body as the basis for the NPL spectralirradiance scale, Metrologia 32, 431-434 (1995/96). P. Sperfeld, K.-H. Raatz, B. Nawo, W. Mà ¶ller, and J. Metzdorf, Spectralirradiance scale based on radiometric black-body temperature measurements, Metrologia 32, 435-439 (1995/96). P. Kà ¤rhà ¤, P. Toivanen, F. Manoochehri, and E. Ikonen, Development of a detector-based absolute spectral irradiance scale in the 380-900-nm spectral range, App. Opt. 36, 8909-8918 (1997). H. W. Yoon, C. E. Gibson, and P. Y. Barnes, Realization of the National Institute of Standards and Technology detector-based spectral irradiance scale, App. Opt. 41, 5879-5890 (2002). L. P. Boivin, A. A. Gaertner, and D. S. 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Nikola Tesla Essay -- biographies biography bio

Tesla was born in Smiljan, Austria-Hungary (now Croatia) on July 9, 1856. He studied engineering at two institutions in Austria-Hungary--Graz Technical University (now in Austria) and the University of Prague (now in the Czech Republic). Tesla left the University of Prague in 1880, without a degree, after his father died. He then worked for a short time for Austria-Hungary's telephone system in Budapest (now in Hungary). In 1882, Tesla moved to Paris, where he worked for the Continental Edison Company. While at Graz Technical University, Tesla had seen a demonstration of a generator run as a direct-current (DC) motor. Direct current is electric current that flows in only one direction. During the demonstration, the brushes and the commutator of the motor sparked violently. The brushes are devices that conduct the current in a DC motor. The commutator continually reverses the current so that the motor continues to rotate in one direction. Tesla believed a motor without a commutator could be devised. In 1881, while walking in a park, Tesla suddenly got an idea for a simple way to produce such a device. In 1883, while on assignment for Continental Edison in Strasbourg, France, Tesla used his spare time to build his first polyphase (out-of-step) AC motor. In such a motor, coils are arranged so that when out-of-step alternating currents energize them, the resulting magnetic field rotates at a predetermined speed. In 1884, Tesla left Europe for the United States and went to work for the inventor Thomas Edison. Edison respected the young engineer but the American inventor was a strong supporter of direct current (DC), and so he had little interest in Tesla's alternating current (AC) generation, transmission, and motor ... ... creation of fluorescent lighting. During his later years he led a secluded, eccentric, and penniless life, nearly forgotten by the world he believed would someday honor him. Tesla died on Jan. 7, 1943, in New York City. It is rather sad that a man who gave the world so much, received so little for his efforts. History books have been unkind as well. Even today, many texts still credit Marconi with the invention of radio, despite the Supreme Court decision which overruled Marconi and awarded it to Tesla. In many parts of this country, people still refer to the electric utility as the 'Edison Company', even though they use the Tesla-Westinghouse alternating current system. The Tesla Museum in Belgrade, Yugoslavia, was dedicated to the inventor after his death and in 1956 the tesla, a unit of magnetic flux density in the metric system, was named in his honor.