Crank Mechanism

Name: Monish Kumar (S11065194) The University of the South Pacific MM313 Dynamic Systems Experiment 2- Crank Mechanism Aim: To investigate the relationship between piston displacement and crank angle for different ratios between the connecting rod and the crank. Also to look at the relationship between the turning moment on the crank shaft and crank angle for a given force on the piston. Equipment and Instrument: Introduction: A crank is an arm attached at right angles to a rotating shaft by which reciprocating motion is imparted to or received from the shaft. It is used to convert circular motion into reciprocating motion, or vice-versa.The arm may be a bent portion of the shaft, or a separate arm attached to it. Attached to the end of the crank by a pivot is a rod, usually called a connecting rod. The end of the rod attached to the crank moves in a circular motion, while the other end is usually constrained to move in a linear sliding motion. Theory: Figure 1. 0: Slider crank mecha nism The slider crank mechanism as shown in figure 1. 0 is a kinematic mechanism. The piston displacement from the top dead centre, x, can be determined from the geometry of the mechanism, in terms of the lengths of the connecting rod, L, and crank, R, and the crank angle, ? can be expressed as x=L+R-(Lcos? -Rcos? ) Also from the geometry, it can be seen that Rsin? =Lsin? And sin? =sin? n Hence cos? =[1+sin? n2]1/2 Where n is a ratio: n=LR Procedure: Part A: 1) No weights and hangers required, the unit initial starting position 0 in the protractor is setup and 90? and 270? protractor positions to be in line with the level lines in each side. 2) The unit is to be setup in its highest point, Top dead centre point was used to work out the displacement value 3) The mounted disc was turned 30? nd the displacement was noted on the results table, this step was again repeated for different angles and different crank positions. Part B: Results: PART A Table 1: Results of Piston Displacement Crank angle| Displacement| | P1 (mm) experiment| P1 (mm) theory| P2 (mm) experiment| P2 (mm) theory| P3 (mm) experiment| P3 (mm) theory| 0| 0| 0| 0| 0| 0| 0| 30| 3| 3. 180748214| 5| 4. 252344481| 7| 5. 324742758| 45| 7| 6. 86291501| 10| 9. 20565874| 13| 11. 55001055| 60| 12| 11. 51142198| 17| 15. 51081741| 20| 19. 51263112| 90| 22| 22. 02041029| 31| 30. 01960212| 39| 38. 2202662| 120| 31| 31. 51142198| 45| 43. 51081741| 53| 55. 51263112| 135| 35| 35. 14718626| 50| 48. 80363849| 63| 62. 4616988| 150| 38| 37. 82176437| 53| 52. 74976709| 68| 67. 67857183| 180| 39| 40| 56| 56| 71| 72| Table 2: calculation of the angle ? Crank angle| ? | 0| 0| 30| 5. 73917| 45| 8. 130102| 60| 9. 974222| 90| 11. 53696| 120| 9. 974222| 135| 8. 130102| 150| 5. 73917| 180| 1. 40E-15| Graph of Displacement (mm) vs. Crank angle position (? ) Sample Calculation: For Displacement P1 at 30? crank angle. To find, ? , n = 5 sin? =sin? n ?=sin-1sin? n=sin-1sin305=5. 73917?To calculate the theoretical displacement, x : x=r1-cos? +nr(1-cos? ) x=201-cos30+nr1-cos5. 73917=3. 180748214 mm Discussion: 1. After plotting the graph of Displacement versus the crank angle position, the graph show that the experimental values and the theoretical displacement can be compared, the experimental plot and the theoretical plot are almost same. 2. From the results graph the graph show that the measured displacement follows the theoretical curve very well. The maximum difference between the experimental and theoretical displacement is 2 mm. 3. For full rotation i. e. 60? the motion of the piston is close to simple harmonic, after 180? the displacement will gradually decrease to 0, it will form a cosine graph. PART B: Piston Balance and Forces Table 3: Piston balance and forces Angle (? )| No added Piston Weight P3 (N)| 4N Added Piston Weight P3 (N)| | LHS| RHS| LHS| RHS| 0| 4. 9| 4. 9| 4. 9| 4. 9| 30| 5. 3| 4. 9| 5. 8| 4. 9| 45| 5. 5| 4. 9| 6. 1| 4. 9| 60| 5. 7| 4. 9| 6. 3| 4. 9| 90| 5. 8| 4. 9| 6. 2| 4. 9| 120| 5 . 5| 4. 9| 5. 8| 4. 9| 135| 5. 3| 4. 9| 5. 6| 4. 9| 150| 5. 1| 4. 9| 5. 5| 4. 9| 180| 4. 9| 4. 9| 4. 9| 5. 3| 225| 4. 9| 5. 3| 4. | 6. 5| 270| 4. 9| 5. 4| 4. 9| 6| 315| 4. 9| 5. 5| 4. 9| 5. 7| Graph of Weights vs. Angle (No added Piston Weight P3 (N)) Graph of Weights vs. Angle (4N added Piston Weight P3 (N)) Discussion: 1) Experimental results was not satisfactory, there was some errors made which was due to friction between the mounted disc and the protractor. 2) After looking at the results graph the greatest amount of force approximately at 60? to 90? for no added piston weight. The weight is 5. 8 N at LHS whereas for 4N added piston weight the greatest amount of force is 6. 5 N at 225? RHS. Conclusion:The kinematic motion of the crank mechanism can be expressed in terms of the lengths of the crank and the conrod, and the displacement of the crankshaft. The experimental measurements of piston displacement agree with the prediction of a theoretical model of the piston motion. Due to friction errors were made in the second part of the experiment but still manage to get the results to find out the greatest amount of force being exerted on crank mechanism. Reference: Experiment 2 – Crank Mechanism. (2013). Suva, Fiji Islands. Kearney, M. (2005, August 15). Kinematics of a Slider- crank mechanism.

Explain “Transfer Pricing” as presented in Stealing Africa

Explain â€Å"Transfer Pricing† as presented in Stealing Africa. Transportation Pricing: When there is any kind of trade or merchandising or buying that occurs between two companies that are lawfully related someway so the monetary value of the goods or the merchandises that are traded between those two companies is what we call reassign pricing. Transfer pricing is fundamentally the money saved by the company by hedging revenue enhancement through selling the goods or purchasing the goods from its ain subordinate and so showing it as an disbursal in its balance sheets. GLENCORE owns the excavation Millss in Zambia and the coal that is obtained from the state is one of the biggest export points of the state and a batch of their fiscal public assistance depend upon this natural resource. What GLENCORE does is that it extracts coal from Zambia through MOPANI mines that it owns in the state and so buys the coal at a monetary value that they set for themselves. This manner they evade paying a higher revenue enhancement rate by demoing a lower income or net income that is generated by the company runing in Zambia. Legally it is of import for companies to bear down a monetary value for a merchandise that they decide to sell and purchase from its subordinate or to its subordinate at a monetary value that would hold been chosen if the company was covering or trading with a company that was non a portion of its entity that is what we normally call an arm’s length trader. Unless and until GLENCORE buys the coal that it extracts from Zambia at a monetary value that it would hold to pay in instance it was purchasing from an independent party. Since the company is non making this, the state and the people of Zambia are enduring through immense losingss in national income as companies like GLENCORE usage transportation pricing to hedge the revenue enhancements that they should really be paying. Taking advantage of the inefficient legal system present in Zambia, the company is carry oning concern in a non-ethical mode. Harmonizing to Stealing Africa and Amos Wilson, Whites are dominant globally because they are still populating on the accrued advantages gained from white privilege historically and in the present. Explain including illustrations. White privilege fundamentally means that a individual gets treated otherwise merely because of his race. When a white individual is given penchant over other people belonging to different races, he is fundamentally sing white privilege. Even though things have been a small better for people from different races late but its still non anything near perfect. Black people are discriminated badly all around the universe but particularly in the western states. The jurisprudence, the province and other establishments are ever biased towards the westerner and the fact that it has been a superior race in the past and is still ruling the universe scenario, it is hard to raise a voice against it and make something to wholly do it halt. In the docudrama, they talked about Marc Rich who had been involved in the biggest fiscal fraud and revenue enhancement fraud in the history of the United States of America but he was still pardoned because of his presence non merely socially every bit good as economically. He had the best of the best attorneies supporting him and constructing up a instance to turn out him guiltless even though there was adequate grounds to convict him and direct him to gaol. GLENCORE’s operations in Zambia are earnestly damaging the country’s environment and public wellness conditions and besides rip offing the country’s fiscal establishments by non paying the right sum of revenue enhancements utilizing transportation pricing to take down their cost and take advantage of Zambia’s uneffective legal system utilizing their expert attorneies and comptrollers that gathers informations and physiques instances and present studies that can non be countered by the Zambians. Africa is a affluent continent yet many Africans live in poorness. Explain. Africa is so a rich continent but the continent is non rich in footings of fiscal criterions and economic growing. The continent is highly affluent when it comes to holding natural resources that are an of import trade good out in the universe and that have attracted legion Multinationals in to the continent. Now even though many would state that the foreign direct investing inflow would assist the states in the continent flourish and recognize their true potency but that is non what is go oning. Majority of the African states are really a portion of the list that includes the poorest states and the little economic sizes. The major ground for this is that the legal system in these states is really inefficient as of now. There is high corruptness and really small focal point on the some of the really major issues such as wellness and instruction. The political system in these states is besides really weak which makes the provinces really vulnerable to foreign influence and puts them at a hazard of being exploited which is what is go oning. The multinationals that are runing in the states in Africa are taking advantage of the all the loopholes on the system and operating in an unethical manner which consequences in highly high net incomes for them but the states itself and the people populating there are severely affected. The negative effects on the people are non merely restricted to pollution and corruptness, there is small money available to better the substructure and no focal point on instruction as they lack even more major basic necessities like nutrient and wellness attention. The rate of unemployment is besides really high and the immense companies prefer paying below the globally recognized pay rates taking advantage of the fact that the people in these states are highly despairing for a occupation. Harmonizing to Amos Wilson ( Blueprint for Black power ) , the wealth of people is non in their things but in their heads. Explain. If the wealth you had depended upon the things that you had so Africa wouldn’t have been fighting with issues such as poorness and unemployment. Taking the illustration of Zambia as it was discussed rather briefly in the docudrama, the state is fighting with serious issues and even though it has copiousness of natural resources like coal, it still fails to better its conditions and is a direct to foreign development. The states that have leverage on other states are the 1s that can acquire what they want even if its illegal and so protect themselves from the effects. They do that by assailing at the loopholes in the system of these hapless or developing states and utilize their influence to acquire their manner. Even though Zambia has immense sums of coal with it but merely holding the resource with them is non making them any good and the state is enduring at the custodies of the multinationals that aren’t paying adequate revenue enhancement and destructing their environment and people’s wellness without any guilt. If these states had people that could be after a manner to utilize their strength in a manner that could assist them protect themselves against these multinationals and foreign influence so the province of the Zambia would hold been better than what it is now. The state lacks heads that could assist them counter the foreign menaces and influence and do people do concern on their footings since they are utilizing their resources, their land and their people. Merely because Zambia lacks a proper system and proper planning and heads that can happen a manner to leverage their place, they will maintain on enduring from legion issues even when it is highly affluent when it comes to natural resources like coal.

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International Finance Essay Example | Topics and Well Written Essays - 1500 words - 6

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South America Essay Example for Free

South America Essay South America is a continent composed of twelve countries and one French colony. The Spanish-speaking countries are: Argentina, Bolivia, Chile, Colombia, Ecuador, Paraguay, Peru, and Venezuela. The former colonies of Guyana and Suriname use English and Dutch, respectively, as their official languages, although many in their populations speak relatively same languages. The same can be said for the French colony of Guiana, the home of the cayenne pepper, where French is the official language. The geography of South America is even more varied than that of North America, with long coastlines, lowlands, highlands and mountains, and tropical rain forests. The climate varies from tropical, lying as it does across the Equator, to alpine in the high Andes, the backbone of it. The cuisine of South America reflects this rich diversity of culture and geography. 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Optical Properties of Zinc Oxide Thin Films Using Two Dopant

Optical Properties of Zinc Oxide Thin Films Using Two Dopant G T Yusuf, MA Raimi, O.E Alaje  and AK Kazeem Abstract The undoped ZnO, Al doped ZnO and Mg doped ZnO films were deposited by a sol-gel spin coating method onto the glass substrates. 0.3M solution of zinc acetate dehydrates diluted in methanol and deionized water (3:1) was prepared. Equal quantity of Aluminum chloride and tin chloride were added to each solution to serve as dopants. The effect of Aluminum and Magnesium doping on the optical ZnO films was studied. The transparency properties of all thin films are more than 80 % at a visible wavelength of (300-800 nm). The optical band gap of pure ZnO thin film is 3.12ev while the band gap for Al-doped ZnO and Mg-doped films are 3.16eV and 3.26eV respectively. All film parameters changed with dopant types. The variation of optical band gap with doping is well described by Burstein–Moss effect. Keywords: Band gap; Doping; Films; Transmittance. Introduction In this Zinc oxide is an II-VI n-type semiconductor with band gap of approximately 3.3 eV at room temperature and a hexagonal wurtzite structure [1]. Recently, doped zinc oxide thin films have been widely studied for their application as conducting electrode materials in flat-panel displays or solar devices. Unlike the more commonly used indium tin oxide (ITO), zinc oxide is a non-toxic and inexpensive material [1]. Furthermore, pure zinc oxide films are highly transparent in the visible range (light wavelength of 400-700 nm) and have high electrical conductivity. However, non-stoichiometric or impurity (Group III elements or Group IV elements) doped zinc oxide films have electrical conductivities as well as high optical transparent. Non-stoichiometric zinc oxide films have unstable electrical properties at high temperature because the sheet resistance of ZnO thin films increases under either oxygen chemisorptions and desorption [9] or heat treatment in vacuum or in ambient oxygen pressure at 3000C-4000C [27]. Turning to impurity doped ZnO thin films, unlike non-stoichiometric ZnO thin films, impurity doped ZnO thin films possess stable electrical and optical properties. Among the zinc oxide films doped with group II elements such as barium, aluminum, gallium and indium, aluminum-doped zinc oxide (AZO) thin films show the lowest electrical resistivity [11]. Aluminum-doped zinc oxide (AZO) has a low resistivity of 2.4Ãâ€"10-4 ÃŽ © cm [11-13], which is quite similar to that of ITO films, which is about 1.2Ãâ€"10-4 ÃŽ © cm [14-16] and AZO also shows good optical transmission in the visible and near infrared (IR) regions. Thus, AZO films have been used as transparent conducting electrodes in solar cells [16, 8]. In addition to doping with Group III elements, doping ZnO with Group IV elements such as [9, 10] Ge, Sn, Ti, Si is also a good way to obtain low resistivity transparent materials in order to replace ITO because Ge, Ti, Zr could substitute on the Zn atom site. For example, Sn can serve as a doubly ionized donor with the incorporation of SnO2 as a solute in ZnO and, consequently, provide a high electron carrier concentration. It is, therefore, expected that the Sn doped ZnO (SZO) will have a higher electrical conductivity and better field emission properties compared with undoped ZnO [10]. A variety of techniques such as DC or RF magnetron sputtering [2], electron beam evaporation [19,20], pulsed laser deposition [21], spray pyrolysis [22,23], chemical vapor deposition [24] and sol–gel processing [25–34,5] have successfully been developed to prepare zinc oxide thin films. Among them, the sol–gel spin coating method is simpler and cost effective. Traditionally, AZO films prepared by this method follow the non-alkoxide route, using metal salts such as acetates, nitrates or chlorides as precursor and dopant, respectively. In addition, organic solvent, such as methanol [20,21], ethanol [16], isopropanol [14], methoxyethanol [11], ethyl glycol and glycerol [10] are widely employed by introducing monoethanolamine (MEA), diethanolamine (DEA) or tetramethyl ammonium hydroxide (TMAH) as stabilizer [10,11,30]. Recently, few studies had reported on the growth of the ZnO thin films with different dopants using sol gel spin coating technique. Therefore, the aim of this research works however is to study the optical and electrical properties of zinc oxide thin films using different dopants with locally fabricated sol gel spin coating technique. Experimental The films have been deposited onto the glass substrates at 400  °C substrate temperature. 0.3M solution of zinc acetate dehydrates diluted in methanol and deionized water (3:1) were prepared and divided into three portions. Aluminum chloride and tin chloride were added to each solution as dopants. A few drops of acetic acid were added to improve the clarity of solution. The concentration of dopants (aluminum chloride AlCl3 ·6H2O, magnesium nitrate hexahydrate [Mg (NO3)2.6H2O and was 3% and kept constant for all experiments. The starting solutions were mixed thoroughly with magnetic stirrer and filtered by WHATMAN filter paper. The solutions were then spin coated on glass substrates which have been procleaned with detergent and then in methanol and acetone for 10min each using ELA 110277248E/2510E-MT ultrasonic cleaner and then cleaned with de ionized water and heated on hot plate for 600C. The coating solutions were dropped onto the glass substrate which was rotated at 4000rpm 45 each by using Ws- 400 Bz – 6NPP/AS spin coater. After depositing by spin coating, the films were then dried at 3000C for 15minutes in a furnace to evapourate the solvent and remove organic residuals. The optical and electrical properties of the films at each time were investigated. The films were then inserted into a tube furnace and annealed in air at 7500C for 1 hour each. The optical transmission and reflectance of the films were examined by spectrophotometer ranging from 400 to 1000nm. The transmittance T and reflectance R data was used to calculate absorption coefficients of the AZO films at different wavelengths. The relationship between transmittance T, reflectance R, absorption coefficient, ÃŽ ±, and thickness d of the film is given by equation (1). (1) The absorption coefficient data was used to determine energy band gap, Eg , using equation (2). (2) Where is the photon energy, A is a constant thus, a plot of against is a curve line whose intercept on the energy axis gives the energy gap. The band energy gap of the film was then determined by extrapolating the linear regions on the energy axis. The absorption coefficient,, associated with the strong absorption region of the film was calculated from absorbance A and the film thickness, t, using (3). (3) The extinction coefficient, k, was evaluated from (4) (4) Where the wavelength of the incident radiation and, t is, is the thickness of the film. The crystal phase of the films was determined by X-ray diffraction (XRD). The refractive index of the films was determined from the maxima and minima of the reflectance curve. (5) Where n is the refractive index, d is the film thickness (nm), is the wavelength (nm) of the incident light, and k is the interference order (an odd integer for maxima and even integer for minima). Results The crystal structure of ZnO films was investigated through X-ray diffraction (XRD). The X-ray diffraction spectrum of ZnO, Al-ZnO and Mg-ZnO film annealed at 7500C with prominent reflection planes is shown in figure 1.The peaks in the XRD spectrum correspond to those of the ZnO patterns from the JCPDS data (Powder Diffraction File, Card no: 36-1451) having hexagonal wurtzite structure with lattice constants a=3.24982Ã…, c=5.20661Ã….The presence of prominent peaks shows that the film is polycrystalline in nature. The lattice constants ‘a’ and ‘c’ of the Wurtzite structure of the films were calculated using the relations (6) and (7). a= √à ¢Ã¢â‚¬ ¦Ã¢â‚¬Å".ÃŽ »/sin ÃŽ ¸(6) c= ÃŽ »/sin ÃŽ ¸(7) Figure 2 shows the optical transmittance spectra of ZnO, Al-ZnO and Mg-ZnO thin films in the wavelength range between 300 to 800 nm. The transparency properties of all thin films are more than 80 % at a visible wavelength of (300-800 nm). It is observed that the transmittance varies with dopant types i.e. aluminum and magnesium. The overall spectra shows an emission band with two obvious peaks, where the first peak, the UV peak which also called the emission or near band edge emission contributed to the free exciton recombination [18]. The second broad peak, also known as the green emission corresponds to the recombination of a photon generated hole with an electron in singly ionized [18]. Figure 1: X-ray diffraction patterns for ZnO thin film for aluminum and magnesium dopants The optical absorbance spectrum measured within the wavelength range of 300–800 nm using a Shimadzu Spectrophotometer is shown in figure 3. Figure 2: Optical Transmittance of the films for aluminum and magnesium dopants Approximately, the band gap alteration of the thin film can be deduced from Figure 3. Here, it evidently shows that changes in the absorption edges are in parallel with types of dopant in the thin film. In order to appropriately estimate the optical band gap equation (2) was used. The presence of a single slope in the plot suggests that the films have direct and allowed transition. It is also well known that ZnO is a direct band-gap material [1] and the energy gap (Eg) can thus be estimated by assuming direct transition between conduction band and valance bands. Theory of optical absorption gives the relationship between the absorption coefficients ÃŽ ± and the photon energy hÃŽ ½ for direct allowed transition as shown in (2) The direct band gap determined using this equation when linear portion of the (ÃŽ ±hÃŽ ½)2 against hÃŽ ½ plot is extrapolated to intersect the energy axis at ÃŽ ± = 0. Plot of (ÃŽ ±hÃŽ ½)2 against hÃŽ ½ for undoped, Al-doped ZnO and Mg-doped films are shown in f igure 3. The optical band of pure ZnO is 3.12ev while the band gap for Al-doped ZnO and Mg-doped films are 3.16eV and 3.26eV respectively. The variation of optical band gap with doping is well described by Burstein–Moss effect [2-5]. For AZO films, compared to pure ZnO films, the contribution from Al3+ ions on substitution sites of Zn2+ ions and Al interstitial atoms determines the widening of the band gap caused by increase in carrier concentration. This is the well-known Burstein–Moss effect and is due to the Fermi level moving into the conduction band. Since doping increases the carrier concentration in the conduction band, the optical band-gap energy increases [2]. Enhancement of band gap thus also ensures that doping was successfully carried out in the ZnO thin films. It is further observed in our present work that an increase in band gap occurs in Mg- doped film as compared with ZnO and Al-ZnO thin films. The absorption properties of the films in UV range are due to the behaviour of ZnO intrinsic optical band gap energy. An absorption coefficient in the UV region significantly varies with types of dopant used. The result suggests improvement in the optical absorption in the UV region with nature of dopant, which provides useful information especially in the optoelectronic devices and device fabrication. . Figure 3: Plot of (ÃŽ ±hÃŽ ½)2 vs. photon energy (in eV) for aluminum and magnesium as dopants Conclusions Transparent conducting thin films (ZnO, Al-ZnO and Mg-ZnO) have been deposited by sol–gel spin coating technique. The optical properties of these films were systematically investigated. X-ray diffraction analysis shows that The peaks in the XRD spectrum correspond to those of the ZnO, Al-ZnO and Mg-ZnO structural patterns is that of hexagonal wurtzite structure with lattice constants a=3.24982Ã…, c=5.20661Ã…. The optical transmittance spectra in the wavelength range between 300 to 800 nm shows that all thin films are more than 80 % at a visible wavelength of (300-800 nm). It is observed that the transmittance varies with dopant types i.e. aluminum and magnesium. The optical band of pure ZnO is 3.12ev while the band gap for Al-doped ZnO and Mg-doped films are 3.16eV and 3.26eV respectively. The variation of optical band gap with doping is well described by Burstein–Moss effect. References [1] N Choudhury and B K Sarma, Bull. Matter. Sci. 32, 43 (2000) [2] E Burstein, Phys. Rev. 93, 632 (1954). [3] T S Moss, Proc. Phys. Soc. London B67, 775 (1954). [4] B E Sernelius, K F Berggren, Z C Jin, I Hamberg and C Granqvist, Phys. Rev. B37, 10244 (19 88). [5] R Cebulla, R Wendt and K Ellmer, J. Appl. Phys. 83, 1087 (1998). [6] B C Mohanty, Y H Jo, D H Yeon, I J Choi and Y S Cho, Appl. Phys. Lett. 95, 62103 (2009). [7] S Gota, J R R Barrado, M Sanchez, N T Barrett, J Avila and M Sacchi, Appl. Phys. Lett. 86,042104 (2005). [8] W Tang and D C Cameron, Thin Solid Films 238, 83 326 (1994). [9] Gà ¶pel, W. and U. Lampe, Influence of defects on the electronic structure of zinc oxide surfaces. Physical Review B, 22(12): 1980p. 6447. [10] Minami, T., H. Nanto, and S. Takata, Highly Conductive and Transparent Aluminum Doped Zinc Oxide Thin Films Prepared by RF Magnetron Sputtering. Japanese Journal of Applied Physics. 23(Part 2, No. 1): p. L280. [11] Igasaki, Y. and H. Saito, The effects of deposition rate on the structural and electrical Properties of ZnO: Al films deposited on (112à ¢Ã¢â€š ¬Ã‚ bar 0) oriented sapphire substrates. Journal of Applied Physics, 1991. 70(7): p. 3613à ¢Ã¢â€š ¬Ã‚ 3619. [12] Minami, T., et al.., Group III Impurity Doped Zinc Oxide Thin Films Prepared by RF Magnetron Sputtering. Japanese Journal of Applied Physics. 24(Part 2, No. 10): p. L781. [13] Kim, H., et al.., Effect of aluminum doping on zinc oxide thin films grown by pulsed laser Deposition for organic lightà ¢Ã¢â€š ¬Ã‚ emitting devices. Thin Solid Films, 2000. 377à ¢Ã¢â€š ¬Ã‚ 378: p. 798à ¢Ã¢â€š ¬Ã‚ 802. [14] Kim, H., et al.., Indium tin oxide thin films for organic lightà ¢Ã¢â€š ¬Ã‚ emitting devices. Applied Physics Letters, 1999. 74(23): p. 3444à ¢Ã¢â€š ¬Ã‚ 3446. [15] Kim, H., et al.., Electrical, optical, and structural properties of indiumà ¢Ã¢â€š ¬Ã‚ Ãƒ ¢Ã¢â€š ¬Ã‚ tinà ¢Ã¢â€š ¬Ã‚ Ãƒ ¢Ã¢â€š ¬Ã‚ oxide thin films for organic lightà ¢Ã¢â€š ¬Ã‚ emitting devices. Journal of Applied Physics, 1999. 86(11): p. 6451à ¢Ã¢â€š ¬Ã‚ 6461. [16] Kim, H., et al.., Electrical and optical properties of indium tin oxide thin films grown by pulsed laser deposition. Applied Physics A: Materials Science Processing, 1999. 69(7). [17] Y E Lee, Y J Kim and H J Kim, J. Mater. Res. 13, 1260 (1998) [18] W.T. Yen, Y.C. Lin, P.C. Yao, J.H. Ke, Y.L. Chen, Thin Solid Films 518 (2010) 3882. [19] T. Minami, H. Nanto, S. Takata, Jpn. J. Appl. Sci. 23 (1984) L280. [20] D.R. Sahu, S.Y. Lin, J.L. Huang, Appl. Surf. Sci. 253 (2007) 4886. [21] H. Kim, A. Pique, J.S. Horwitz, H. Murata, Z.H. Kafafi, C.M. Gilmore, D.B. Chrisey, Thin Solid Films 377–378 (2009) 798. [22] M.A. Kaid, A. Ashour, Appl. Surf. Sci. 253 (2007) 3029. [23] A.F. Aktaruzzaman, G.L. Sharma, L.K. Malhotra, Thin Solid Films 198 (1991) 647. [24] T. Minami, H. Sonohara, S. Takata, H. Sato, Jpn. J. Appl. Sci. 33 (1994) L743. [25] W. Tang, D.C. Cameron, Thin Solid Films 238 (1994) 83. [26] T. Tsuchiya, T. Emoto, T. Sei, J. Non-Cryst. Solids 178 (1994) 327. [27] M. Ohyama, H. Kozuka, T. Yoko, J. Am. Ceram. Soc. 81 (1998) 1622. [28] A.E. Jimenez-Gonzalez, J.A.S. Urueta, R. Suarez-Parra, J. Cryst. Growth 192 (1998) 430. [29] P. Sagar, M. Kumar, R.M. Mehra, Thin Solid Films 489 (2005) 94. [30] T. Schuler, M.A. Aegerter, Thin Solid Films 351 (1999) 125. [31] S.Y. Kuo, W.C. Chen, F.I. Lai, C.P. Cheng, H.C. Kuo, S.C. Wang, W.F. Hsieh, J. Cryst. Growth 287 (2006) 78. [32] J.H. Lee, K.H. Ko, B.O. Park, J. Cryst. Growth 247 (2003) 119. [33] Y.S. Kim,W.P. Tai, Appl. Surf. Sci. 253 (2007) 4911. [34] V. Musat, B. Teixeira, E. Fortunato, R.C.C. Monteiro, P. Vilarinho, Surf. Coat. Techno 180–181 (2004) 65. 1

Artificial Neural Networks (ANNs) Experiment

Artificial Neural Networks (ANNs) Experiment Abstract Artificial neural networks (ANNs) is applied for prediction of product selectivity in biological sulfide removal. An experimental setup is constructed for investigation of biological sulfide removal in a fed batch bioreactor. In this process, sulfide is biologically converted into elemental sulfur and sulfate by the bacterium Thiobacillus thioparus. In addition, thiosulfate is produced in a side reaction. The effect of various parameters (dissolved oxygen, concentration of bacteria and sulfide load) is investigated on the types of products. The main product is elemental sulfur at low dissolved oxygen or at high sulfide loads and also more sulfates are produced at high dissolved oxygen. At high concentration of bacteria, sulfur and sulfate selectivity are increased, and thiosulfate selectivity is decreased. By using gathered experimental data, an artificial neural network model is developed to calculate the selectivity of products at different operating conditions. The comparison betw een proposed ANN model and the experimental data demonstrates a great precision of the model. Introduction Hydrogen sulfide as an extremely toxic gas is emitted by many industries such as oil, gas and petrochemical industries [1]. It has potential for the damaging nervous system at low-dose exposures. Furthermore, sulfide is highly corrosive and has a very unpleasant odor. The threshold limit value for air 0.5–10 ppbv [2], natural gas 4 ppmv [3] and for fresh or salty water fish is 0.5 ppm [4]. In the recent years, biological sulfide removal at ambient temperature and pressure has been investigated as an alternative to the conventional methods. A review on the bacteria of the sulfur cycle was discussed by Tang et al which contributes to a better understanding of the process [7]. Also, a review of the biological removal of H2S from gas streams was studied by Sayed et al [8]. Several microorganisms, namely sulfur compound oxidizing bacteria (SOB), are capable of oxidizing H2S at ambient temperatures and pressures. Different types of bioreactors are used for biological sulfide removal, the more common types are: bioscrubber, biotrickling filter, and biofilter. In the last two processes, the H2S-containing gas passes through a moist, packed bed of particles, which are coated by microorganisms. The biotrickling filter, and biofilter are proper for low sulfide capacity, which the sulfide is mainly converted to sulfate [8]. In the case of biological H2S removal from natural gas, the bioscrubber is more preferred. In a bioscrubber, H2S is washed from the natural gas stream by an alkaline such as NaOH (Eqs. 1 and 2) in a gas absorber, then the rich alkaline solution is sent to an agitated bioreactor where the sulfide ions (HS) are converted to elemental sulfur or sulfate (Eqs. 3 and 4). The produced elemental sulfur is separated by sedimentation [8-11]. Production of elemental sulfur is preferred since it is less harmful than sulfate. Furthermore, hydroxyl ions, consumed in the absorption of H2S in the alkaline liquid, are regenerated upon oxidation of sulfide to elemental sulfur (Eq. 3). Also, elemental sulfur is easily separated by sedimentation. In addition to the biological reactions, dissolved sulfide can react with S0 to produce polysulfide ions (), according to Eq. 5, and ions are abiotically oxidized to S0 and, according to Eq. 6 [12]. Teder [13] has shown that the chain length of polysulfide ion (Sx2-) increases with increase of temperature (x = 5.0 at 25  °C and x = 6.5 at 80  °C). At moderate alkaline conditions, the average chain length of polysulfide (x) varies from 4.6 to 5.5 [12-15]. The product selectivity in the biological sulfide removal process depends on different parameters such as bacteria concentration, sulfide load to the bioreactor and dissolved oxygen [*** Roosta]. This study investigates the applicability of artificial neural networks (ANNs) for the prediction of the biological sulfide removal performance in a fed batch bioreactor. Materials and Methods In this study, Thiobacillus thioparus (DSMZ 5368) was used as sulfur oxidizing bacteria for producing elemental sulfur in the biological sulfide removal process.In this regards, a bioreactor with total volume of 3.8 liter operated under fed batch conditions was used, as shown in Figure (1). During all experiments, the temperature was controlled at 30 ±0.3  °C, and the pH was controlled at 8 ±0.2 using 1N HCl and 1N NaOH solutions. Dissolved oxygen (DO) as a manipulated variable was changed between 0.5 and 6 ppm and controlled using nitrogen and oxygen injection. The bioreactor was charged with 2000 cc of the medium inoculated with biomass. After stabilizing of the temperature in the bioreactor at 30  °C, feeding of the sulfide solution was started. The concentration of sulfide was determined based on the methylene blue method proposed by Trà ¼per and Schlegel [16], by using a spectrophotometer (Zeiss) at 665 nm. The sulfide solution was injected to the bioreactor by an infus ion pump (JMS OT-701), after calibration of the pump. During the experiments, the sulfide solution is applied at different flow rates (between 1.5 and 23 ml h-1) to achieve different HS load (between 0.5 and 4.0 mmolL-1h-1). The flow rate of recirculating gas was adjusted to 15 L min-1 and was spread by a diffuser; this caused a good mixing of the broth. The concentration of sulfur compounds were measured during the process. In this regards, the total concentrations of sulfide (HS and polysulfide) were determined based on the methylene blue method [17]. The concentration of polysulfide was determined based on Teder [14] method. The concentration of sulfide (HS) is the difference between total sulfide concentrations and polysulfide concentration. The concentration of sulfate was determined via the turbiditimetry method at 420 nm [17], and the thiosulfate concentration was determined via the methylene blue method at 760 nm [18]. Finally, the concentration of elemental sulfur is calculated by the mass balance on sulfur. The present study investigates the effect of operating variables: dissolve oxygen (DO) value (0.5 – 4 ppm), HS load (0.5 – 4 mmol L-1 h-1) and optical density (OD) of bacteria (0.4 – 0.6) on the sulfide removal and product selectivity. ANN Artificial Neural Networks (ANNs) with different structures has been proven to be universal function approximators. The major advantage of ANN model is to be constructed without detailed information about the underlying process. ANNs as black box modeling tools have already been used for many applications in industry, business and science [19]. Since in white box modeling approaches, the model of development is based on the information of mechanistic and relevant equations and detailed knowledge for a specific system is usually not directly available, most efforts in the white box modeling approach are devoted to revealing all relevant mechanisms and quantifying these mechanisms correctly. This usually requires an extensive research program (including experiments, which can also be very time- and money-consuming). Here a compromise must be made in order to save time and money. Therefore, white box models often have limited accuracy, because in developing the models, minor mechanisms are neglected and only the major mechanisms are taken into account. The major advantage of the artificial neural networks is that they can be constructed without the need of detailed knowledge of the underlying system. One of the applications of artificial neural network models is to map an input space to an output space and function as a look-up table. Thus, in recent years, artificial neural networks have been applied to biotechnology and biochemical engineering researches [20-27]. In this study, a Multi Layer Perceptron (MLP) neural network is utilized in order to develop an appropriate model for the prediction of products selectivity. MLP This type of network consists of an input layer, an output layer and one or more hidden layers (Figure 2). The number of neurons in the input and the output layer depends on the number of input and output parameters respectively. However, the hidden layer may contain desired neurons. All the layers are interconnected as shown in Figure (2) and the strength of the interconnections is determined by the weights associated with them. Each input of neurons (p) is weighted with an appropriate (w), the sum of the weighted inputs and the bias (b) forms the input to the transfer function (f). Neurons can use any differentiable transfer function f to generate their output (n) and is given as: Multilayer Perceptron networks often use the log-sigmoid transfer function (Eq. 8); however, other functions are commonly used. In this work, one hidden layer was chosen for the networks (as shown in Figure 2), and the optimum neuron numbers for hidden layer was calculated. By using Bayesian regularization back propagation, the MLP neural network was trained. This training method updates the weight and bias values according to the Levenberg- Marquardt optimization [28]. It minimizes a combination of squared errors and weights, and then determines the correct combination so as to produce an artificial neural network that generalizes well. Training was carried out until the mean absolute relative error (MARE) which represented by Eq. 9, was minimized. When the training was terminated, to avoid over learning, the error of test and training data were calculated. As illustrated in Figure (2), the inputs of the proposed networks are DO value, bacteria OD and HS load, and the outputs are elemental sulfur, sulfate and thiosulfate selectivity. To choose the best network structure, different configurations of MLP networks were trained and tested. Network parameters such as: numbers of hidden layers, numbers of neurons in each hidden layer, transfer functions and training algorithm were studied in this attempt. Eventually, the network structure that produced the smallest error for testing and training data was determined. The needed experimental data were measured at different DO values, bacteria ODs and HS loads, and comprise 300 observations. Using the random selection method, 75% of all data (225 data sets) were assigned to the training set, while the rest of the data were used as the validation set. Results and Discussions A part of the obtained experimental data are shown in Table (1). According to the results, increasing of bacteria OD leads to more sulfur and sulfate selectivity, but leads to decrease of thiosulfate selectivity. Although, by increasing DO value, sulfate and thiosulfate selectivity increase, and sulfur selectivity decreases. In addition, increasing sulfide load leads to increase of elemental sulfur and thiosulfate selectivity, and decrease in sulfate selectivity. After many attempts, the best ANN obtained is a MLP with one hidden layer. The optimum number of neurons in the hidden layer is 15 neurons as shown in Figure (3). The transfer function of the first layers is a hyperbolic tangent sigmoid (Eq. 9) and that of second layer is a positive linear function. The parameters of the ANN structure are shown in Table (2). As shown in Figure (4) the ANN model has been able to capture all the features of the system reasonably and can be used for estimating the product selectivity within the range in which it has been trained. Figure (4a) compares the results of applying the training data and Figure (4b) compares the applying test data to the MLP with experimental data at different conditions. The correlation coefficient (R2) value of the ANN model is near to one, which indicates a good accuracy of the ANN model. The relative error between experimental data and calculated values, for verification data are illustrated in Figure (5). As seen in this figure, mean absolute relative error (MARE%) for sulfate, sulfur and thiosulfate selectivity are 4.4, 1.77 and 0.23% respectively. The results show that the proposed model is in a good agreement with experimental data which ANN did not observe in the training phase. Conclusion In biological sulfide removal, elemental sulfur production should be maximized to save more hydroxyl ions. Thus, the prediction of product selectivity is essential in the design of the biological sulfide removal system. An artificial neural network based model was developed for the prediction of product selectivity as a function of DO, OD of bacteria and HS load, in the biological sulfide removal system. The best architecture of the MLP network was obtained by trial. Application of the proposed ANN model for training and test data indicates that it can predict the product selectivity with a considerable accuracy.

Pro War in Iraq Essay -- War Wars Argumentative persuasive Essays

Pro War in Iraq I do not subscribe to the fashionable notion of moral equivalence between all deeply-held beliefs. I believe in the rights of the individual over the collective. I believe democracy is better than dictatorship, both morally and practically. Not necessarily democracy as we or the Americans or the French practice it, but the idea that in every possible practical way, you should let people make their own decisions, and if these decisions need to be circumscribed in any way, then you should only do it with the explicit approval of a majority of the people in question. And above all that a people must be able to change governments and leaders without resorting to force.   Ã‚  Ã‚  Ã‚  Ã‚  So my ongoing position is that I am not comfortable with a world in which there are prosperous democracies and failing dictatorships, and we are supposed not to notice because somehow it would be disrespectful of the people living under the dictatorships. I don’t buy it.   Ã‚  Ã‚  Ã‚  Ã‚  The problem, of course, is that many peoples currently living under dictatorships might, if asked right now, come up with some deeply unpleasant policy decisions. They might even vote against democracy, saying they don’t want it. This is the worry in many countries with an Islamic fundamentalism problem: if they can get a majority the fundamentalists are committed to democracy under the slogan â€Å"one man, one vote, just this once†. That is not democracy.   Ã‚  Ã‚  Ã‚  Ã‚  Democracy needs certain conditions to get started. It is an eco-system, not a single tree, you can’t just plant it and sit back in its shade. But once it is established, it is hard to uproot. People talk about democracy needing a democratic â€Å"culture†, but culture is the wrong word, it makes it sound subjective. What it really needs is a universal foundation based on respect for the individual: freedom of speech, freedom of association, primacy of the rule of law, relinquishing the use of political violence, the rights of women to participate fully in economic, social and political life. It may be the case that these values are most clearly held in Northern Europe, North America and the English-speaking world. But they are not western values: they are all founded in the primacy of the rights of the individual. Where these values have had a chance to become established in other cultures, they take root. Southern and Eastern Europe, Japan a... ... under any circumstances, is unequivocal.   Ã‚  Ã‚  Ã‚  Ã‚  Apart from the obvious point that all UN members are always selective about which resolutions they get involved in implementing, it is worth reading Resolution 242 itself. Sure enough, it requires â€Å"Withdrawal of Israeli armed forces from territories occupied in the recent conflict†. At the same time, however, it requires â€Å"Termination of all claims or states of belligerency and respect for and acknowledgement of the sovereignty, territorial peace within secure and recognized boundaries free from threats or acts of force.† The State referred to in the second part is, of course, Israel; the claims, threats, territorial incursions and violence are those visited on it by its neighbors since its creation and acknowledgement by the UN. The resolutions against Saddam Hussein were unilateral and unequivocal. They are materially different from resolutions that present a package of requirements that have to be carried out by both sides in a conflict, and whose implementation is going to require the cooperation of both sides.   Ã‚  Ã‚  Ã‚  Ã‚  And there you have it. I think the intervention is morally justified, practically required, and legally based.

Urban Transportation :: essays research papers

The development of urban transportation has not changed with the cities; cities have changed with transportation. In the early years of transportation it was the mass transit of horse and buggies or electric rail cars that shaped cities. Then as the automobile became affordable to the public, personal transportation redefined the city as it was known. It is the automobile and the movement to the suburbs that has public transportation struggling to make money today. The very first transportation was with the horse. Then someone came up with the idea to pair a horse up with a buggy. Now four to six people could be carried at one time. These horse and buggies began to be common sight in cities and public transportation was born. Before the horse and buggy people were confined to the distance they could walk, so cities could not grow much. People lived in the central business district because that is where they worked. Now with the simple horse and buggy, people that can afford the transportation can move a mile or two out of the central city (Guathier 174).The big explosion of growth and increased ridership came at the turn of the century. The cause of this explosion was the electric streetcars that were installed in many cities. Whichever direction the rail lines were laid down and the streetcar moved, people began building their homes in that direction. The automobile was just getting its beginning and people were depending on public transportation to get them to work. As the streetcar's tracks expanded east and west, the city's population shifted that way as well. People did not need to be in walking distance of their workplace anymore, but in walking distance of the nearest pickup point of the streetcars (Guathier 175). As streetcars increased their length of lines and service, the public increased their choices of residential locations. People with higher incomes were able to move out of the central part of cities and into outer areas (Guathier 174). This also fostered the concentration of different ethnic groups within separate neighborhoods (Guathier 175). This separation reversed the intermingling that had been taking place during the late 1800's between various economic groups and the different ethnic groups in the cities. Social stratification and sorting of different groups throughout the city was rapidly increased thanks to the streetcar spreading out the cities (Guathier 175).As cities spread out in the early 1900's, railroads developed interurban and suburban railroad to connect the outlying areas of the city.

To Rent Or Not To Rent :: essays research papers

Renting a home to live in, rather than buying a home to live in is a much wiser decision. When renting a home you are able to have free maintenance, partially included utilities and the freedom to pack up and move at anytime you wish.   Ã‚  Ã‚  Ã‚  Ã‚  We all like the luxury of being waited on, especially if it is at no cost to us. With a rental home, if the plumbing fouls up, the roof starts to leak or some other untimely mishap, free maintenance is only a phone call away for the renters because the landlord is liable for repairs on his rental properties. Whereas, the unlucky home owners better have some deep pockets when something goes awry in their household. Because a home owner does not have the free maintenance that those who rent do. The only things the home owners get are maintenance expenses and some free headaches.   Ã‚  Ã‚  Ã‚  Ã‚  Partially included utilities are a real bonus for those who rent. Some rentals have both water and trash pick up paid by the landlord. That means two extra bills the renters need not to worry about. One can water his or her grass and take long showers without having the worry of having to look forward to a large water bill. While the one who owns their own home, has to be rather limited in their water use or else they may have to pay the high water bills.   Ã‚  Ã‚  Ã‚  Ã‚  Renting homes also has a nice freedom. When a person rents, they can always up and move with a written thirty day notice given to their landlord. For instance, what if the neighborhood starts to turn into a less desirable area for residing in? Like maybe the crime rate goes up or bothersome neighbors move in next door? Well then, the renter can look for another place in a more desirable part of town and move out of their rented home. On the other hand, if a person owns their home, they either have to deal with the unfavorable changes in the neighborhood or put their house up for sale.

Buddhist religion Essay

The Four Noble Truths are the foundations of the Buddhist religion. From these emanate the rituals and beliefs still practiced today. The Buddhist philosophy centers on the basic truth that with the existence of life, the presence of suffering comes along with it. So, it is a primary aim of a Buddhist to alleviate oneself from the suffering of life. Hence, this contemporary Buddhist practices revolve around the four Noble Truths which explain how to end suffering and guide one’s self into what they call Nirvana, an enlightened state of being. To end suffering, one must overcome ignorance, craving or attachment to worldly pleasures which are rooted to the evils of lust, hatred and delusion. To overcome these evils and hasten their way towards Nirvana, most of Buddhist monks practice celibacy, teaching and preaching. Their days are often spent in rituals, devotion and meditating. What defines the basic moral code of the Buddhist religion is the observance of five precepts which prohibit killing, stealing, harmful language, sexual misbehavior, and getting intoxicated. To counteract these evils and overcome suffering, Buddhists try to instill within their very selves the practices of loving-kindness, compassion, sympathetic joy, and equanimity. They pray fervently, contemplate, and devote their lives to simple chores and service to others in order to facilitate the achievement of their enlightenment. To encapsulate these practices meant to suppress suffering is to follow Siddhartha Buddha’s Noble Eight-Fold Path which consists of right views, right intention, right speech, right action, right livelihood, right effort, right-mindedness, and right contemplation. Following this path will lead, eventually, a believer towards Nirvana.

Attendance Monitoring System Essay

The main aim of this paper is to develop an accurate, fast and very efficient automatic attendance system using fingerprint verification technique. We propose a system in which fingerprint verification is done by using extraction of minutiae technique and the system that automates the whole process of taking attendance, The study was conducted using a quantitative approach by designing a questionnaire as the data collection instrument based on fingerprint matching biometric technologies. The survey involved 6 employees based on stratified random sampling technique. The results however show that fingerprint biometric identifier was found suitable for the employee attendance management system of the organization. Keywords: Biometrics, fingerprint ,employee attendance, identifier, etc . 1. Introduction In many institutions and organization the attendance is very important factor for various purposes and its one of the important criteria that is to follow for students and organization employees. The previous approach in which manually taking and maintains the attendance records was very inconvenient task. After having these issues in mind we develop an automatic attendance system which automates the whole process of taking attendance and maintaining it. We already know about some commonly used biometric techniques are used for objective identification ,verification are like iris recognition, voice identification, fingerprint identification, DNA recognition ,etc .Biometrics techniques are widely used in various areas like building security,etc. A fingerprint is an impression of the friction ridges on all parts of the  finger. A friction ridge is a raised portion of the epidermis on the palmar (palm) or digits (fingers and toes) or plantar (sole) skin, consisting of one or more connected ridge units of friction ridge skin. These are sometimes known as â€Å"epidermal ridges† which caused by the underlying interface between the dermal papillae of the dermis A fingerprint is an impression of the friction ridges on all parts of the finger. A friction ridge is a raised portion of the epidermis on the palmar (palm) or digits (fingers and toes) or plantar (sole) skin, consisting of one or more connected ridge units of friction ridg e skin. These are sometimes known as â€Å"epidermal ridges† which caused by the underlying interface between the dermal papillae of the dermis The term fingerprint is refers impressions transferred from the pad last joint of fingers and thumbs, though fingerprint cards also typically record portions of lower joint areas of the fingers (which are also used to make identifications)[6]. It is believed that no two people have identical fingerprint in world, so the fingerprint verification and identification is most popular way to verify the authenticity or identity of a person wherever the security is a problematic question. The reason for popularity of fingerprint technique is uniqueness of person arises from his behavior ; personal characteristics are like, for instance uniqueness, which indicates that each and every fingerprint is unique, different from one other. Universality ,that means every person hold the individual characteristics of fingerprint. The three basic patterns of fingerprint ridges are the arch, loop, and whorl ï‚ · An arch is a pattern where the ridges enter from one side of the finger, rise in the center forming an arc, and then exit the other side of the finger[13]. ï‚ · The loop is a pattern where the ridges enter from one side of a finger, form a curve, and tend to exit from the same side they enter. ï‚ · In the whorl pattern, ridges form circularly around a central point on the finger. Scientists have found that family members often share the same general fingerprint patterns, leading to the belief that these patterns are inherited  © 2013, IJARCSSE All Rights Reserved Page | 379 Rao et al., International Journal of Advanced Research in Computer Science and Software Engineering 3(4), April – 2013, pp. 379-383 2. Attendance Monitoring Model Automatic attendance system using fingerprint verification technique. A fingerprint is captured by user interface, which are likely to be an optical solid state or an ultrasound sensor. Generally, there are two approaches are used for fingerprint verification system among them first one is Minutiae based technique, in which minutiae is represented by ending or termination and bifurcations. Other one is Image based method or matching pattern. Minutiae-based matching: This is the most popular and widely used technique, being the basis of the fingerprint comparison made by fingerprint examiners. Minutiae are extracted from the two fingerprints and stored as sets of points in the two- dimensional plane. Minutiae-based matching essentially consists of finding the alignment between the template and the input minutiae sets that results in the maximum number of minutiae pairings[1] Pattern or Image based matching: Pattern based matching use algorithms to compare the basic fingerprint patterns like arch, whorl or loop between a previously stored template and candidate fingerprint.For this purpose image is required to be alinment in same orientation. In matching process algorithms finds a central point on the fingerprint image and centre on the image. In pattern based algorithm, the template contains the type, size and orientation of pattern within the aligned fingerprint image. The candidate fingerprint image is graphically compared with the template to determine the degree to which the match. 3.Implementation Of Process This process complete in three phase and also phase description is mention below:Phase 1. Fingerprint scanning and registration Fingerprint scans convert people’s fingerprints into digital codes or numerical data that can be recorded in a database. Like facial recognition software, fingerprint scanning matches an individual’s code against an existing database of codes in order to confirm that individual’s identity. Proponents of fingerprint scanning point to the conversion of fingerprints into digital data as a privacy protection measureFingerprint scanning is already in use as an identification system that replaces cards or keys: to log onto computers. Before scanning the fingerprint everyone has to fill the registration form.These form have the some of the basic details of the individual such as  name,father’ s name,mother’s name,date of birth and so on. Fingerprint scanning Registration form  © 2013, IJARCSSE All Rights Reserved Page | 380 Rao et al., International Journal of Advanced Research in Computer Science and Software Engineering 3(4), April – 2013, pp. 379-383 PHASE-2:- Fingerprint recognition or authentication Fingerprint recognition or fingerprint authentication refers to the automated method of verifying a match between two human fingerprints. Fingerprints are one of many forms of biometrics used to identify individuals and verify their identity. This article touches on two major classes of algorithms (minutia and pattern) and four sensor designs (optical, ultrasonic, passive capacitance, and active capacitance). The analysis of fingerprints for matching purposes generally requires the comparison of several features of the print pattern. These include patterns, which are aggregate characteristics of ridges, and minutia points, which are unique features found within the patterns.[1] It is also necessary to know the structure and properties of human skin in order to successfully employ some of the imaging technologies.[10]. Minutiae-based fingerprint matching algorithm has been proposed to solve two problems: correspondence and similarity computation. For the correspondence problem, use an alignment-based greedy matching algorithm to establish the correspondences between minutiae. Fingerprint recognition systems have the advantages of both ease of use and low cost.  © 2013, IJARCSSE All Rights Reserved Page | 381 Rao et al., International Journal of Advanced Research in Computer Science and Software Engineering 3(4), April – 2013, pp. 379-383 Phase-3:-Attendance update:Employee Attendance Management software is tightly integrated with  the organization’s HR data. The in-time and out-time, lunch and breaks entered by the employees will help the respective authority in charge to keep in track the activities of the employees. ï‚ · Employee Attendance Management System helps in keeping track of the attendance of employees based on various events like shift, late, overtime, permission, holiday working and on duty.[5] Single click view of all time office events like hours worked, late, permission, on duty, overtime, leave of an employee for date or month period can also be obtained from this Attendance Management system. ï‚ · Employee Attendance Management Software helps to monitor the productivity of the employees and also keep a check on the Employee absenteeism which in turn helps in achieving the organization goals. 4. Result The report will be generated with name of the employee matched fingerprint and stored in an attendance system. Attendance log of the month is shown in below table: This software not only prepare the monthly report but also shows the attendance of the individual day. It not only display the name of the present employees but it also display the employee which is absent or late on that particular day.This software also display the name of employees which is in preplan live.The individual attendance reports is shown below:  © 2013, IJARCSSE All Rights Reserved Page | 382 Rao et al., International Journal of Advanced Research in Computer Science and Software Engineering 3(4), April – 2013, pp. 379-383 5.Conclusion And Future Work The proposed system will make way for perfect management of students and staff attendance and produce more accuracy. Future work on this project would include the creating of a matching algorithm that uses to mention and maintain the different type of leave such as on duty leave,leave without pay ,medical leave and soon.Also timely update the leave of the each employees when it take leave. The efficient matching algorithm have to be developed in theory and in code so that our goal of getting faster and more accurate matched image than with pre-existing software. References [1] Jianjiang Feng, â€Å"Combining minutiae descriptors for fingerprint matching†, Pattern Recognition, pp. 342 – 352, April 2007. [2] Peng Shi, Jie Tian, Qi Su, and Xin Yang, â€Å"A Novel Fingerprint Matching Algorithm Based on Minutiae and Global Statistical Features†, IEEE Conference, 2007. [3] Neeta Nain, Deepak B M, Dinesh Kumar, Manisha Baswal, and Biju Gautham â€Å"Optimized Minutiae–Based Fingerprint Matching†, Proceedings, 2008. [4] BioLink 2006. Time and attendance, Retrieved 11thDecember,2011fromhttp://www.m3biometrics.co.uk/Portals/2/downloads/BioTime_Time_and_Attendance.pdf. [5] InfoTronics, Inc. 2008. Biometrics: Advantages for employee attendance verification, Michigan: Farmington Hills. Retrieved 11th November, 2011 from www.mwtime.com/biometrics.pdf. [6] Jain, A., Hong, L., Pankanti, S., Bolle, R., 1997. An Identity Authentication System Using Fingerprints. Retrieved 10th June, 2012 from http://biometrics.cse.msu.edu/Publications/Fingerprint/JainEtAlIdentityAuthUsingFp_ProcIEEE97.pdf. [7] K. Asai, Y. Hoshino and K. Kiji, â€Å"Automated fingerprint Identification by minutiae-network feature- feature extraction process,† IEICE transactions, Vol.J72-D-II, N0.5, pp 724-732, 1989. [8] Chaur-Chin Chen and Yaw-Yi Wang, â€Å"An AFIS Using Fingerprint Classification,† Image and Vision Computing, 2003. [9] Virginia Espinosa-Dur6, â€Å"Fingerprints Thinning Algorithm,† IEEE AES Systems Magazine, 2003. [10] U. Halici, L. C. Jain, A. Erol, â€Å"Introduction to Fingerprint Recognition,†Intelligent Biometric Techniques in Fingerprint and Face Recognition,L.C. Jain, U. Halici, I.Hayashi, S.B. Lee, S. Tsutsui (editors), CRCPress, 1999. [11] Manvjeet Kaur, Mukhwinder Singh, Akshay Girdhar, and Parvinder S.Sandhu, â€Å"Fingerprint Verification System using Minutiae Extraction Technique,† World Academy of Science, Engineering and Technology 46 2008. [12] Anil K. Jain, Arun Ross and Salil Prabhakar, â€Å"An introduction to biometric recognition,† Circuits and Systems for Video Technology,IEEE Transactions on Volume 14, Issue 1, Jan. 2004 Page(s):4 – 20. [13] L. O’Gorman, â€Å"Overview of fingerprint verification technologies,†Elsevier Information Security Technical Report, Vol. 3, No. 1, 1998. [14]. Eric P. Kukula, Christine R. Blomeke, Shimon K. Modi, and Tephen J. Elliott, â€Å"Effect of Human Interaction on Fingerprint Matching Performance, Image Quality, and Minutiae Count†,

American Traditions Reflected In The Literature Of 1865-1912 Essay

The United States has always professed itself to be the â€Å"land of the free. † In fact, most of its traditions are rooted in its value for freedom, family and country. How often is it in public speeches that we are reminded that â€Å"all men are created equal that they are endowed by their Creator with certain unalienable rights†¦that among these are life, liberty and the pursuit of happiness. † Literary pieces produced between the years of 1865 and 1912 show a growing awareness and search for understanding of civil rights and democracy. Uniqueness and personal individuality and perspective were reflected in the writing styles and stories that appeared during this time. Nineteenth century poet Emily Dickinson’s poems in â€Å"The Complete Poems of Emily Dickinson† reflect her views and awareness of the role of women in a patriarchal and free society. Indeed her writings could very well be considered ‘feminist. ‘ Walt Whitman’s â€Å"Leaves of Grass’ was representative of an America that was alive, rich and natural. He states: â€Å"The Americans of all nations at any time upon the earth have probably the fullest poetical nature. The United States is essentially the greatest poem† (Whitman, 1855) Yet while his views were generally â€Å"romantic† in nature, his demonstrates a keen awareness social issues such as the growing materialism brought about by industrialism. He called for literature that would bind the readers in a more spiritual and imaginative state as individuals in his â€Å"Democratic Vistas† (1871. ) American Literature saw the birth of awareness and definition of freedom. Freedom was then too general a concept yet the literary products in this period showed the emergence of expressions for individuality against convention, true liberty, and pride in identity. American Literature 2 2. GENDER AND ETHNIC MINORITIES IN THE ECONOMIC AND LITERARY DEVELOPMENT IN 1865-1912 Literature has been used as an expression of freedom of thought, feelings, and ideals. It has also been used as a tool of social awareness and activism that meant to inspire reform particularly in the disparity experienced by women and ethnic minorities in that era. As the industrial age prepared to take root in the United States, ethnic minorities like the Native Americans, Africans and Asians, and other ethnic groups grew more marginalized in existence. Africans became slaves who were made to work in the tobacco and cotton fields. Others were pressed into domestic servitude in the homes of the wealthy White men. Literature at in reference to women and the ethnic minorities viewed them as objects that â€Å"White men† own. This dehumanization served as a sort of â€Å"muse† for the emerging â€Å"realist† writers. If popular literature referred to them as non-entities, the realists raised their plight up as a sign for the need for social awareness and change. In her â€Å"Woman in the Nineteenth Century,† essayist and on of America’s first respected female journalists Margaret Fuller, brought up the existence of sexual discrimination and suggested steps in an effort to promote the independence of women. She was an advocate of equality gained through human freedom and dignity. Mark Twain’s â€Å"Huckleberry Finn† defied conventions and spoke out against the practice of slavery and the irrationality of â€Å"civilized† society. The friendship of his lead characters Jim and Huck went beyond the strictures of a slave-owning society and culminated in something that was happy and generous. Emancipation of women, abolishment of racism, marginalization and slavery according to the realist writers, were what should define American freedom, humanity and democracy†¦not the materialism and human ownership brought by industrialization. References â€Å"The Romantic Period, 1820-1860, Essayists and Poets†. Outline of American Literature. United States International Information Programs (2006) Retrieved August 29, 2007 from http://usinfo. state. gov/products/pubs/oal/lit3. htm â€Å"The Rise of Realism: 1860-1914†. Outline of American Literature. United States International Information Programs (2006) Retrieved August 29, 2007 from http://usinfo. state. gov/products/pubs/oal/lit5. htm

Supporting and Promoting Children and Young People’s Positive

Natalie Cullen 19/11/12 Supporting and promoting Children and Young People's positive behaviour Part 1: Behaviour Policy Charles Saer primary school's behaviour policy is for all who are involved in the school. A few examples of who these people are pupils, staff, volunteers and school governors and even parents to name just a few. These rules are equal to all. This ensures all who attend the school know what behaviour is expected of them and what behaviour will not be tolerated.The policy gives a list of aims of what is hoped to be achieved by these rules being followed by everybody. The aim is for good behaviour to make a major contribution in providing a safe, pleasant enviroment for all to work and play in, to build and raise self-esteem, respect, honesty, truth, co-operation, kindness and tolerance of others. 1) This will make the children feel safe as with good and positive behaviour a safe, welcoming, enjoyable enviroment will be built for them to work and play in. ) By giving the children a safe positive enviroment where good behaviour is shown by all, it teaches the children respect, honesty, truth, co-operation, kindness and tolerance of others. This will make a positive contribution not only to school life but also society and their own futures. 3) By the children learning to behave in a good decent manner and being rewarded for this will also raise their self-esteem and self-worth as well as build their confidence. It teaches them to treat others with respect and kindness and to take other peoples feelings into account, thus helping their social and emotional skills. ) The children are able to learn the expectations of what is expected of them by rewarding their good behaviour and giving sanctions for any bad behaviour. This also will teach them that they are responsable for their own actions and bad behaviour choices have consequences. Code of Conduct The code of conduct is a set of short, simple, realistic rules for everyone to follow. These rules are again for everyone not only the children as it is also important that the adults lead by example and set good standards as they are infact role models for the children. Also read: Different Approaches to Promoting Wellbeing and ResilienceThe rules are useful in the day to day of school life. Charles Saer has 5 main rules of conduct: 1) We never shout or run in school 2) We always care for others and their property 3) We are always polite and do as we are told 4) We never fight or throw things 5) We always keep our school tidy Classes however may have their own rules for inside the classroom as different circumstances may arise for example ages of children, special needs etc. Although they will still reflect the behaviour of which is expected by the school. ) Children will feel safe by the code of conduct as it cleary states what is expected behaviour and what is not. So if a child experienced any type of bad behaviour towards them they know it will not be accepted and to inform a teacher of the issue. 2) The code of conduct will help the children to make a positive contribution towards helping the school achieve the safe, pleasant enviroment for all to work and play in, to build and raise self-esteem, respect, honesty, truth, co-operation, kindness and tolerance of others. ) By the children learning to behave in a good decent manner and being rewarded for this will also raise their self-esteem and self-worth as well as build their confidence. It teaches them to treat others with respect and kindness and to take other peoples feelings into account, thus helping their social and emotional skills. Also helping them to become well rounded members of society. 4) It helps the children to see rules are there to be followed and what is expected as good behaviour and what is unacceptable behaviour giving them expectations and limits. Rewards and SanctionsRewards and Sanctions are basically ways of teaching the children when they have shown good behaviour when a reward is then given or bad behaviour when a sanction is given and will be seen to be fair. This will emphasise the diffrence between good and bad behaviour. Rewards at Charles Saer it is important to recognise and encourage good behaviour with some types of rewards such as: signs of approval, praise and encouragement, displays of work, comments in homework books, class points which can be banked for negotiated class treats, student of the week certificates and medals, tickers and badges, golden book ticket, silver awards, special mention in assembly, postcard/phonecall home. This way the childs confidence and self worth is boosted and they are more likely to keep up the good behaviour. Sanctions however when a child has shown bad behaviour a sanction must be given to that child to teach them it is not acceptable how they have behaved. Some types of sanctions that we use at Charles Saer are: eye contact (a mean look! ), adult disapproval, time out chair or isolation table in the classroom, child will be given a post it which the teacher will write e. . 5minutes in Mrs Smiths class and child will go to that class for given time, unacceptable behaviour will be discussed with child after lesson and not during, kept in at play time, serious misbehaviour will lead to involvment of the head teacher and maybe parents will also be asked to come in to school. 1) Children will be made to feel safe by gaining rewards for their good behaviour as it will give them a sense of achievment, recognition and self worth. ) Children will want to make a positive contribution into the school by ensuring they show good behaviour and try their best at all times to gain the rewards on offer for any good behaviour as this gives them a great feeling of doing well and a sense of accomplishment. 3) The reward system helps develop social and emotional skills as by the children following the simple rules of respect, honesty, truth, co-operation, kindness and tolerance of others, this also gives them the basics for good behaviour and being rewarded for that also helps them develop self esteem, self worth, confidence in themselves. ) Rewards and Sanctions help childr en to understand when expectations are met they are rewarded and praised. When these are not met there is consequences to their actions, teaching them to take responsiblity and that there are limits to which bad behaviour will not be accepted. Dealing with conflict and Inappropriate behaviour At Charles Saer school if a pupil is still presenting challenging behaviour after numerous attempts to try and intervene e. g. rewards, sanctions etc then there are some steps the staff will take to take the matter further. ) A childs parents will be contacted and asked to come in to discuss the situation 2) the next step if still no improvement would be to put the child on a report where his behaviour is monitored throughout the day and good and bad behaviour is recorded, the SENCO should be informed and given copies, 3) If after 4 weeks no improvement the the child should be placed on the SEN register and parents and authorities will discuss the issue. There are 3 stages and if no improvement then child will be referred to pupil referral services . Of course this type of continuing challenging behaviour is very unlikely to occur so serverly.More often than not a conflict or any sort of inappropriate behaviour a pupil displays that is serious can be resolved quickly by informing the parents and the head and class teacher being involved and some sort of plan and agreement as to what the course of action should be. 1) The other children at the school would feel safe knowing that when another child is behaving badly to a serious extent the staff are seen to be taking action against the bad behaviour and taking the matter very seriously, keeping to the their promise in the behaviour policy of ensuring a safe and enjoyable enviroment. ) If inappropriate behaviour is seen to be dealt with seriously then the other children are more likely to make a positive contribution by showing good behaviour and abidding to the rules of the school. 3) The child may be behaving inappropriatl ey due to their home life, so by first displaying bad behaviour and getting into trouble. They may then learn how to behave in a better way with the help of the staff which would help to develop that childs social and emotional skills that they probably wouldnt have learnt at home. 4) Rules and structure help children to understand what is accecptable behaviour and what is not.There has to be boundaries or the children wont be aware of what the limits are and will just keep seeing how far they can go. Anti-Bullying Bullying can be in the form of indirect, physical, verbal or cyber. Common forms of bullying are racial, sexuality, disability etc. Bullying has zero tolerance and will dealt with extreme seriousness. Once the staff have been informed and it is brought to their attention that bullying is taking place the head teacher will interview all concerned and will record the incident, class teachers and parents will be informed and if serious enough police will also be contacted.Sa nctions such as warnings, detention, even exclusion will be given. The victim will recieve support to be able to talk about it. Monitoring of the situation will continue until the head feels it is no longer a threat. 1) Children no doubt feel a lot more supported and safer knowing there is action they can take if they are being bullied in or out of school. 2) Children can make a positive contribution by their behaviour by acting in kind and caring way to one another and learning to accept everyone and their diffrences. ) By teaching children to respect, have honesty, tell the truth, have co-operation, show kindness and to have tolerance of others, that there are people who are different in the world. We give them them knowledge to understand and be accepting of diffrences helping to develop their social and emotional skills 4) Understanding the expectations n limits of bullying is to always treat people kindly and the way you'd expect to be treated by others and to know bullying is an extremley serious matter and will be dealt with serverly. AttendanceCharles Saer's Attendance policy is very similar to the behaviour policy, in that it aims to provide a welcoming and caring enviroment so the pupils can recieve a full time education to reach their full potential, there are incentives and rewards given to acknowledge the efforts of high attendance. Giving the pupils a sense of achievment and self worth. There is also rules to be followed, such as to be on time when school starts, what procedures to follow if off sick or have appointments etc, if too many absences then school will have to ask a family support to becoming involved.So like the behaviour policy there are rewards for good attendance n sanctions for bad attendance. 1) The children will feel safe by the attendance policy as yet again its setting out rules and structure very clearly. Which will make the children reassured knowing its the same rules, same expections, no confussion or uncertainty. 2) The c hildren can make a positive contribution by keeping up a good attendance and geting to school on time. ) By keeping a good attendance this will develop their social and emotional skills because they will be in school socializing with other children and learning but also theyll be developing a sense of achievement, self worth. If awards are given this will highten their self esteem. It will also benefit them in later life when they have jobs. 4) The policy helps lay the expectations and limits out clearly of what the school expects to be good attendance and what will limit that high attendance rate they are hoping for. Part 2:It is benefical to encourage and reward positive behaviour as it shows the child that you have acknowledged their behaviour and paid attention to the effort made by them. It also gives them a feeling of pride and happyness to have their behaviour praised, even if the reward is just a smile or a simple â€Å"well done I'm really proud of you†. Rewarding an d encouraging good behaviour gives the child confidence, self-esteem, self-worth, all the important things a person needs to become a self efficent adult in the future and make them feel like they have a purpose.