The appendices of Poster Essay Example | Topics and Well Written Essays - 2750 words

The appendices of Poster - Essay Example It owns several cash & carry clubs, forecourt stores, discount department stores, discount stores, hypermarkets and supermarkets. It is a publicly traded organization and its shares are listed in the London and Irish Stock markets. The company was founded by Jack Cohen, in 1919 (Tesco Plc, 2011). The current CEO of the organization is Philip Clarke and its chairman is Richard Broadbent (Tesco Plc, 2014b). The company sells goods and services of various brands but at the same time it also acquires its own range of product lines. The primary products and services of the company are books, furniture, clothing, electronics; financial, telecoms, internet services and DVD rental services; petrol and software and many other products. Since, its inception, the business of the company has significantly grown up and at present it operates in more than twelve major economies in the world. With rise in scope and scale of business, the customer base of the company has also expanded across all mar ketplaces and the gross employment generated by the concern has increased. It is estimated that Tesco generates employment opportunities for approximately 530,000 individuals around the world. The company claims that all important decisions are undertaken according to the vision statement. Tesco acquires multiple superior assets in business and its activities ensure utility maximization of its business stakeholders. It uses innovative ideas in business with which it provides high quality services and this has helped it gain loyalty of customers. The company claims that it prioritises on doing the right thing for its colleagues, customers and the communities and it has gained high brand value in the market only with such initiatives (Needle, 2010). Many economists claim that an institution affects the business outcomes of concerns and are hence susceptible for analysis. It is the set of social, legal, economic and political conventions that institutes the

Use of Lexical Choices and How They Would Affect the Discursive Power Essay

Use of Lexical Choices and How They Would Affect the Discursive Power of Media - Essay Example People seek to reach their aims and goals by using power. In defining power attention must be paid to the fact that it is not something you can simply possess. It is rather a relationship between people. Power is always related to situations. Using power means having the power to persuade and impress through verbal communication. Pekonen (1991, 46) states that modern politics can be explained as a symbolic power struggle: the winner is a party whose language, words, terms and symbolic expressions are dominant once reality and the context have been defined. (Chilton, P. & Ilyin M. p 4) Presidential speeches are very important to society. According to Denton and Hahn (1986), the presidency is a rhetorical institution. Through speeches, a president leads his country and seeks to persuade the nation and society. Presidential power is the power to persuade. The rhetorical style of a presidential speech can directly affect the political speaker's aims and success. Han (1998) believes that the significance of presidential rhetorical skills has increased over the last 50 years and in part because of the media. This conceals some problems: when the style is emphasized, content may have only a secondary role. The images may be stronger than the message, and credibility may be more important than information. In this study, attention is paid to the (d) Meanings Aristoteles le of presidential power and per-suasion especially from the rhetorical point of view. (Aristoteles) Kress (1990) has introduced theoretical criteria characterizing work in the CDA paradigm which distinguishes it from other politically engaged discourse analysis work. (a) Language is first and foremost a type of social practice. (b) Texts are the result of the actions of socially situated speakers and writers. (c) The relations of the participants in the production of texts are generally unequal. (d) Meanings are the result of the (inter)action of readers and hearers with texts and with the speaker/writers of texts. They are always subject to more or less closely enforced normative rules, and to the relations of power obtaining in this interaction. (e) Linguistic features at any level are the result of social processes. Linguistic features are never arbitrary conjuncts of form and meaning. (f) Linguistic features in their occurrence in texts are always characterized by opacity. (g) Users of language have a particular stance towards the set of codes which make up a language. (h) A system of language is highly problematic in CDA. (i) History has to be taken into account. (j) CDA must be based on rather precise analyses and descriptions of the materiality of language on a close linguistic description. (Kress, p 84) CDA begins from the assumption that systematic asymmetries of power and resources between participants - speakers and listeners, readers and writers - can be linked to their unequal access to linguistic and social resources. The important unit of analysis is the text. Texts are taken to be social uses of spoken and written language. Critical discourse analysis focuses on a genre as well as on sentences and word-level analysis. The study of subject positions may clarify traditional values, ideologies and representations. When analyzing the cultural assumptions expressed in a text, one way to do it is to study the lexical choices or grammatical representations of agency and action.     

Weekly post Assignment Example | Topics and Well Written Essays - 250 words - 1

Weekly post - Assignment Example These global cycles involve the circulation of elements and nutrients that sustain both the biological and physical aspects of the environment. For example, all known organisms on this planet depend on water to sustain them.   They are constantly cycling water, consuming it on a regular basis either by itself or with nutrients, while expelling water (with waste products) at the same time.   Besides being critical for the biosphere, water is also an extremely important part of the physical environment. When water vapor condenses to form clouds, more of the Suns rays are reflected back into the atmosphere, usually cooling the climate. Conversely, water vapor is also an important greenhouse gas in the atmosphere, trapping heat in the infrared part of the spectrum in the lower atmosphere. Water is also involved in other biogeochemical cycles.   The hydrologic cycle intersects with almost every other element cycles, as well as some of the geological cycles such as the sedimentary cy cle.  Ã‚   In this and other activities, we are going to study how carbon cycles through our ecosystem and how mankind affects this cycle.   It is important that we understand how carbon cycles through the ecosystem for two reasons. The first of these reasons is that all organic material contains carbon.   From the smallest vitamin molecule all the way up to the long polymer chains of proteins and DNA, carbon provides the basis of all organic compounds.   The second reason why we need to understand the carbon cycle is because of its effect on the physical environment.   Carbon, in the form of carbon dioxide, is released as a waste product of oxidation.   This means that it is released during the combustion of fossil fuels, as well as the respiration of organisms.   As we will see later, this can have a tremendous effect on our climate, since carbon dioxide is a greenhouse gas. Carbon has two phases in the carbon cycle: gaseous and solid.   Its gaseous phase is mostly in the

Individual project 3 Essay Example | Topics and Well Written Essays - 1500 words

Individual project 3 - Essay Example ether a range of subjects that are pertinent to current global healthcare and fitness challenges especially when considered together with the need to reverse the rising incidences of lifestyle diseases. Individuals and societies around the globe should acknowledge the impact of diet on health and nutrition. It is common knowledge that a consistent pursuit of the right forms of diet can help bring down the incident of some of the lifestyle diseases among individuals, families, groups, and societies. Indeed, the rise in heart diseases, diabetes, some forms of cancer, obesity, and other life conditions correlated with the increase in poor diet practices across the globe (Shils, 2005). As such, it becomes necessary to consider the impact of nutrition within the understanding of the current trends and dietary practices and the consequences on human health. Most nutritionists will easily agree that the best way to maintain a healthy diet and cut down on the levels of cholesterol in the body is to reduce the daily intake of foods rich in cholesterol. The danger is that most people tend to ignore the value of restricting their diet to foods that are significantly lower in the levels of cholesterol. Many others lack access to the kind of knowledge that would help them avoid adverse health practices that are associated with high levels of cholesterol. However, basic categorizing of food into those that have high and cholesterol levels is one of the ways by which people can avoid the adverse impacts of cholesterol. Food substances such as meat pie, butter, cream, hard cheese, and biscuits contain high levels of saturated fat. Such foods have multiple adverse effects on health and fitness. Other foods such as salmon, mackerel, almond, sunflower, and corn have unsaturated cholesterol. A consistent pattern of feeding on this group of food can reduce the levels of cholesterol within days or weeks. Despite lack of thorough research on the impact of culture on general fitness,

Latin America ( Physical system ) Essay Example | Topics and Well Written Essays - 500 words

Latin America ( Physical system ) - Essay Example 269). Recently, the president of Ecuador (Correa) has been in defense of the oil extractions plans in the Amazon (Laht.com, 2014). According to the president, the plans to carry out the oil extraction will have minimal impact to the people and the environment. The government of Ecuador plans to extract oil from Yasuni National Park located in the amazon forest. This forest contains a high level of biodiversity and acts as an ecosystem to thousands of organisms. Altering the ecosystem in favor of the economy will lead to deforestation and climate change. Cutting down of the trees in order to obtain oil will mean reduced carbon absorption. Moreover, this region offers habitat to a different organism, and it is a source of water for human beings. Once the operations begin, the mentioned advantages will be affected negatively. The extraction of oil has several effects on the country. On the positive side, it is going to improve the country’s economy by increasing GDP and providing employment. On the negative side, this event will destroy the habitat and will contribute a lot to global warming due to the emission of industrial waste into the environment. This move by the president sparked several concerns of displeasure. Environmental organizations were concerned on how this move to destroy acres of land in search for oil. However, this move by the president will have numerous political effects in the country. For instance, there have been rising concerns about the president’s leadership, whether he is fit to rule the country (Smith, 2014). People wonder if he has their interest at heart. The president managed to garner political support through the parliament to facilitate his pursuit. The bill was passed in support of the new project. Non-governmental institutions are infuriated by this act. As a result, they embarked on a campaign to oppose the bill. The country is set to experience a political divide. On one hand, some advocate for oil

D. Forecast for Next 12-18 months Essay Example for Free

D. Forecast for Next 12-18 months Essay The world economic outlook is bright. World GDP growth is forecast to average slightly more than 4 percent per annum during 2006-2007. Asia will continue to act as the primary engine of global growth, though activity will also be supported by continued U. S. economic expansion of almost 3 percent annually. China will continue to register robust growth of slightly more than 9 percent per annum, and output will continue to increase rapidly also in India. Japan also appears to be entering a longer phase of stable growth. The positive global environment will be reinforced by the Euro Area, where economic growth is forecast to accelerate in response to a recovery in domestic demand (The Research Institute of the Finnish Economy). The National Institute of Economic and Social Research has recently released a set of forecasts regarding the state of world economy in 2007. Below are listed some of the key points: Global growth will quicken to 5. 1 per cent this year falling back only a bit in 2007 to a still rapid 4. 7 per cent. Inflationary pressures are rising, mainly owing to higher oil prices, but the impact of rising oil prices on inflation and output is now more muted than in the past. Global imbalances remain marked and the dollar may have to fall by a further 30 per cent in order to halve the US current-account deficit. The US economy will grow by over 3 per cent a year in both 2006 and 2007, but inflationary pressures are mounting. The Japanese economic recovery has become self-sustaining and GDP will rise by 3. 1 per cent in 2006 and by 2. 6 per cent in 2007. The Euro Area will expand by around 2 per cent a year in both 2006 and 2007, and consumer price inflation will average about 2. 5 per cent in both years. The NIESR report goes on to elaborate upon the aforementioned points: Advanced countries in the OECD bloc are participating in the upswing but the main reason for the current period of exceptionally strong global growth is the long boom in China. In 2005, China represented 15. 4 per cent of global GDP on a purchasing-power parity basis, up from 3. 4 per cent in 1980. Global inflation is rising in response to higher oil prices, but much less so than in the past. New estimates suggest that a $10 permanent rise in oil prices will add 0. 2 to 0. 4 percentage points to inflation in the United States in the four years to 2009, with a somewhat smaller impact in the Euro Area, and a still smaller effect in the UK. The global upswing continues to be accompanied by major imbalances, notably the scale of the US current account deficit, which widened by 4. 5 percentage points of GDP between 1997 and 2005. Since this deterioration has mainly financed increased consumer spending rather than productive investment, financial markets may conclude that the deficit is not sustainable. It is estimated that the dollar’s value against a basket of currencies needs to fall by a further 30 per cent in order to reduce the current account deficit by 3 percentage points of GDP. The US economy will grow by 3. 6 per cent in 2006 and by 3. 1 per cent in 2007. The economy continues to be driven mainly by consumption, which will increase by 3. 3 per cent in 2006 and by 2. 9 per cent in 2007. Housing investment is slackening but business investment, stimulated by high corporate profits, will buoy growth this year and next. Inflation is picking up and the private consumption deflator will rise by 3. 0 per cent in 2006 and by 3. 3 per cent in 2007. There now appears little doubt that the Japanese recovery from the bleak period of deflation and stagnation has become self-sustaining. The economy grew by 3. 5 per cent in the year to the first quarter of 2006 . Business investment is expanding strongly and consumer spending is expected to grow by 1. 9 per cent a year in 2006 and 2007. Average earnings, which had been falling earlier in the decade, will grow by 0. 8 per cent in 2006 and by 2. 8 per cent in 2007. The outlook for the Euro Area is for higher inflation despite a fairly modest recovery. Consumer prices will rise by 2. 6 per cent in 2006 compared with 2. 2 per cent in 2005. Tighter monetary conditions together with measures in Germany to cut the budget deficit will hold back growth in consumption and GDP in the Euro Area. Consumer spending will also be restrained by sluggish growth in average earnings as the corporate sector manages to retain its increased profitability (Barrell et al, 8-31).

Fuzzy Logic Based Smart Solar Power MPPT

Fuzzy Logic Based Smart Solar Power MPPT Design and Optimization of a Fuzzy Logic Based Smart Solar Power Maximum Power Point Tracker A. KocabaÃ…Å ¸ and H.Ä °. OkumuÃ…Å ¸ Karadeniz Technical University, Trabzon/Turkey Abstract- As the issue of efficiency is one of the most important fundamentals of solar power generation, maximum power point tracking (MPPT) systems have an important duty in solar power management systems in solar power generation. This paper includes study of the design and improvement of fuzzy logic based solar power MPPT, and the methodology to achieve the best system performance. MPPT system was evaluated at the DC-DC power converters ability of impedance conversion point of view and cooperation of fuzzy logic theory. The parameters of fuzzy inference system are optimized to obtain the fastest and accurate system responses. The performance of the proposed fuzzy logic based MPPT under various operating conditions compared and improvement of this performance is dealt with. The fuzzy logic MPPT function realized using a buck-boost power converter. Computer simulations practiced and simulation results also represented. Keywords- Maximum Power Point Tracking, Fuzzy Logic Control, Solar Power Generation. Solar power is one of the most harmless and cleanest, plentiful supply of energy in the world. It is unfailing and like to be our fundamental supply of power in future [1]-[2]. Solar power has already used widely for industrial, commercial, residential and military applications. Performance of solar power generation by photovoltaic (PV) cells depends on the environmental conditions such as insolation, sunlight tilt, load variations, airmass and cell temperature [10]. Power converter units should be associated with the PV cells and the load to control the power flow from the PV cells to the load. PV systems use MPPT systems to maximize power output, by the ability of continually arranging the duty ratio increment command of the switching device in the power converter unit. Algorithms used in MPPT systems maximize power extractions of PV cells by controlling the duty ratio of the power converter with the changing PV cell output variable combinations like changes in power versus changes in voltage etc. MPPT algorithms such as perturb and observe, incremental conductance have been evaluated until now. [3]. Unchanging step size for the control signal, increment of the duty ratio command, used in these methods. Too small steps sizes cause slow tracking process and too large step sizes cause oscillations around the maximum power point (MPP). To perform automatically adjusting step sizes, variable step sizing algorithms such as fuzzy logic has been developed [4]-[7]. Specification of fuzzy logic controllers is made according to their skill of simulating human thinking. Different than conventional controllers, fuzzy controllers have the ability to experimental methods and their results to design variable step sizes of control signals without the need of understanding the systems mathematical model [9]. Effectiveness of the MPPT algorithm is directly related with the input and the output variables that are selected for the system. In general for output variable, duty ratio of the power switch selected. As input variables; power (P) versus voltage (V) slope and changes of the slope, P-V slope and variation of power, variation of power and variation of voltage, sum of conductance and increment of conductance would be selected [8]. In this paper as inputs of the controller variation of power and variation of voltage, as an out put duty ratio of the power switch selected. Sunpower SPR-305E-WHT-D (One series module and one parallel strings) PV panel used for simulations in this paper. The characteristics of the PV panel at 25  °C and at various irradiation levels are shown in Figure 1. The characteristics of the PV panel at 1000 W/m2 and at various temperature levels are shown in Figure 2. To make the analysis simple, we have worked on resistive load. Figure 3 illustrates the circuitry of PV panel and resistive load, and current (I)-voltage (V) characteristics with an irradiation 1000 W/m2 and temperature of 25  °C. The intersection of the I-V characteristic curve (blue) of the PV panel and load I-V curve (red) is the operating point of the system. From this figure it can be observed that the operating point changes with the change of the load value. The maximum power point (MPP) can be achieved through proper selection of the load. Maximum power may be extracted from the PV array by incorporating an intelligent mechanism altering the load resistan ce of the PV array. Power converters are usually used to achieve this purpose. Figure 1. The characteristics of the PV panel at 25  °C and at various irradiation levels. Figure 2. The characteristics of the PV panel at 1000 W/m2 and at various temperature levels. Figure 3. PV system with resistive load Figure 4 shows the block diagram of the investigated MPPT system. The system includes a PV panel, a buck-boost power converter and a fuzzy logic based MPPT controller. The function of controlling power flow from source to the load is carried out by the zeta type buck-boost converter as shown in Figure 5. The values of converter circuit elements are Lin = 11  µH, L1 = 378  µH, CIN = C1 = 1000  µF and CPV = 680  µF. The pulse width modulation (PWM) switching frequency was set to 200 kHz. Internal resistances were ignored to obtain (1) on the converters input and output voltage equation in steady state: (1) If we assume that converter operates lossless with a resistive load RL, the value of the power obtained from this PV system would be: (2) It is demonstrated additionally, in Figure 5, that P-V curves at miscellaneous irradiation levels according (2) and miscellaneous duty ratio commands with the ohmic load 3 à ¢Ã¢â‚¬Å¾Ã‚ ¦. The intersections show the operating points of PV system. In this study fuzzy theory is used to design the MPPT controller. Required fuzzy input variables are generated by fuzzy MPPT controllers by reading voltage and current signals obtained from the PV panel. The fuzzy input variables would then can be used to calculate the increment of the duty ratio command for adjusting operating point of the PV panel in order to maximize the power extraction. In Figure 6 the flowchart of the calculation process illustrated. Designs of fuzzy controllers are varies according to the input variables selected. As mentioned before in this paper as input variables, variation of power and variation of voltage of the PV array selected. Figure 4. Solar MPPT system. Figure 5. Power converter and PV power characteristics. Figure 6. Flowchart of calculation process. A. Fuzzy MPPT Tracking Algorithm In this study fuzzy logic MPPT system used variations of PV cell power output (à ¢Ã‹â€ Ã¢â‚¬  PPV) and variations of voltage (à ¢Ã‹â€ Ã¢â‚¬  VPV) as the fuzzy input variables. By using MATLAB Simulink proposed solar power maximum power point tracking system implemented and universe of discourse (UOC) of input and output membership functions determined. After determination of UOD membership functions, they are grouped with the names negative big, negative small, zero, positive small, positive big (NB, NS, ZE, PS, PB). Fuzzy rules database is shown in Figure 7. Iterations made by moving on the P-V slopes specified regions as shown in the figure 7. Figure 7. Fuzzy rules for algorithm using à ¢Ã‹â€ Ã¢â‚¬  PPV and à ¢Ã‹â€ Ã¢â‚¬  VPV as the inputs. First of all symmetric membership functions used in the simulations as shown in Figure 9 and then asymmetrical membership functions used as shown in Figure 10. The performance difference compared then. For fuzzification; Mamdani method and for defuzzification; centre of gravity method used in this study. Fuzzy interface system evaluated by using MATLAB Simulink fuzzy logic toolbox. Figure 8. Fuzzy controller s surface of rule base. Figure 9. (a) Membership function for à ¢Ã‹â€ Ã¢â‚¬  PPV (b) Membership function for à ¢Ã‹â€ Ã¢â‚¬  VPV (c) Membership function for increment of duty ratio command. Figure 10. Asymmetrical input membership functions (a) Membership function for à ¢Ã‹â€ Ã¢â‚¬  PPV (b) Membership function for à ¢Ã‹â€ Ã¢â‚¬  VPV (c) Membership function for increment of duty ratio command. Purposed MPPT system is simulated by using different types of membership functions for comparison and validation. MATLAB/Simulink model block diagram of the system is shown in Figure 11. Figure 11. MATLAB/Simulink model block diagram of the system By using membership functions shown in Figure 9 the simulation results obtained as shown in Figure 12 and by using membership functions shown in Figure 10 the simulation results obtained as shown in Figure 13. Figure 12. Simulation results (symmetrical membership functions used) Figure 13. Simulation results (asymmetrical membership functions used) As shown in figures above when symmetrical membership functions used the fuzzy controlling system was unable to respond quickly to the rapid changes of irradiation so that fitting time of output power curve was longer and this is a disadvantage of the controlling system that is undesired. Beside at low irradiance levels MPPT controller couldnt produce accurate control signals and PV panels operating point was different than the maximum power point. The performance difference of the designed system when two types of membership functions used respectively can be seen more clearly from Figure 14. Figure 14. Output power of PV panel. Here we can see the disadvantages of using symmetrical membership functions. To overcome this problem and improve the system response speed to the changes of irradiation then asymmetrical membership functions has developed. Another benefit of developed system is that, at low irradiation levels precision of MPPT is more higher. In this paper a fuzzy logic based solar maximum power point tracking system was designed and different types of membership functions were used to optimize system power generation performance. To achieve the goal of higher precision and fastest system responses to the changes of irradiation levels different types of membership functions of inputs of fuzzy inference system were researched and compared with each other. It was revealed that using asymmetrical membership functions in the fuzzy logic controller had improved system performance at all operating conditions. From the results of simulations it can be inferred that the system performance is directly related with the optimization of the membership functions of fuzzy inference system. This study also leads to the study of the designing methodology of optimization of asymmetrical membership functions for better system performance. References [1] International Energy Agency. Technology Roadmap: Solar Photovoltaic Energy, IEA Publications: Paris, France, 2014. [2] K. Tomabechi, Energy Resources in the Future. Energies 2010, pp. 686-695 [3]N. Femia, G. Petrone, G. Spagnuolo, M. Vitellio, Optimization of Perturb and Observe Maximum Power Point Tracking Method. IEEE Trans. Power Electron. 2005, pp. 963-973. [4]T. Yong, B. Xia, Z. Xu, W. Sun, Modified Asymmetrical Variable Step Size Incremental Conductance Maximum Power Point Tracking Method for Photovoltaic Systems. J. Power Electron. 2014, pp. 156-164. [5]C.S. Chin, P. Neelakantan, H.P. Yoong, K.T.K. Teo, Optimisation of Fuzzy Based Maximum Power Point Tracking in PV System for Rapidly Changing Solar Irradiance. Trans. Sol. Energy Plan. 2011, pp. 130-137 [6]T. Radjai, P.J. Gaubert, L. Rahmani, The new FLC-Variable Incremental Conductance MPPT Direct Control Method Using Cuk Converter. In Proceedings of the 2014 IEEE 23rd International Symposium on Industrial Electronics (IEIE), Istanbul, 2014, pp. 2508-2513. [7]R. Rahmani, M. Seyedmahmoudian, S. Mekhilef, R. Yusof, Implementation of Fuzzy Logic Maximum Power Point Tracking Controller for Photovoltaic System. 2013, pp.209-218. [8]J-K. Shiau, Y-C. Wei, B-C. C, A Study on the Fuzzy Logic Based Solar Power MPPT Algorithms Using Different Fuzzy Input Variables. ISSN 1999-4893, 2015. [9]T.J. Ross, Fuzzy Logic With Engineering Applications, vol 2, pp. 1-652. [10]R. Hernanz, C. Martin, Z. Belver, L. Leseka, Z. Guerrero, P. Perez, Modelling of Photovoltaic Module., International Conference on Renewable Energies and Power Quality, 2010.