Application of SMES Unit to improve the performance of wind turbine conversion system
The amount of wind turbine connected to the power grid has significantly increased during the last decade. This has resulted in essential need to establish grid codes. Previously, wind turbine generators (WTGs) were allowed to be disconnected from the network during any disturbance at the grid side to avoid WTGs from being damaged. However, lately, the transmission system operators (TSOs) require WTGs to be stayed connected to provide support to the grid during fault. This new requirement has been regulated in the new grid codes. In this paper, the super conducting magnetic energy storage (SMES) unit is used to enhance the high voltage ride through (HVRT) capability of DFIG based WTG during voltage swell events at the grid side. Two new grid codes are used to verify the ability of the SMES unit to avoid the WTG from being disconnected from the grid.
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Assessing the Economic Impact of Climate Change (Rainfall) on Productivity of Sorghum Crop in Gadarif State, Sudan
This paper was prepared to estimate the current and projected relationship between climate change (rainfall) and variability and the productivity of sorghum under rainfed mechanized farming system in Gadarif State. The study ultilized secondary data covering the period 1940-2014. The data analyzed using descriptive analysis, Bias Correction and Spatial Downscaling (BCSD) and Representative Concentration Pathways (RCPs). The most important results revealed that an increasing trend of rainfall indicating the evidence of existance of climate change in the State. The study also found that the dry rainfall years affect the productivity of sorghum by reducing it by 4.9 kg/feddan/year and that floody rainfall years leads to decreasing the productivity by 11.3 kg/feddan/year, while the productivity was decreasing by 3.39 kg/feddan/year in normal rainfall years. As with respect the projection to future rainfall and yield, two scenarios based on greenhouse gas concentration in the atmosphere for the period 2020-2100 were used. The best scenario assumed an RCP of 2.6 and the worst one assumed an RCP of 8.5 .The results of best scenario predicted an expected decrease rainfall by 0.865 mm/year and decrease in crop yield at rate of 1.121 kg/fed/year in case of maximum temperature; and at rate of 0.618 kg/fed/year in case of minimum temperature. The result of the worst scenario predicted an expected decrease in rainfall at the rate of 0.554 mm/year with consequent decline in crop productivity at a rate of 5.235 kg/fed/year in case of maximum temperature and at a rate of 4.844 kg/fed/year in case of minimum temperature. The effect of increase greenhouse gas concentration in future leads to decrease rainfall and decrease yield of sorghum in Gadarif State.
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Backend analysis and implementation of RLS adaptive filter using VLSI technology
The role of electronic equipments in the industry has increased tremendously in recent past. With new technologies and techniques being considered in other domains, such as automotive, multimedia communications, mobile applications bring down the cost of the electronic gadgets. As the cost factor controls the reliability and volume issues, there is a need for design and development of low cost, reliable technology for industrial applications. The proposed techniques have been modeled using Verilog HDL and the models have been verified using test benches with a functional coverage of 95%. The results obtained have been compared with MATLAB results, which are considered to be a benchmark. The HDL (Hardware Description Language) code is synthesized using Synopsys Design Compiler targeting 130-nanometer TSMC (Taiwan Semiconductor Manufacturing Company) library and target technology. The synthesized netlist obtained for all the adaptive filtering techniques proposed in this research work is taken through physical design flow consisting of Floorplanning, Placement and Routing steps. The results obtained at each step are simulated for the functionality. The final GDSII (Graphical Design Standard II) file is generated for the proposed techniques.. The floor planning, placement and routing of the netlist ensures that the overall size for the entire chip does not exceed by 7.2 square millimeters. The results obtained for adaptive filtering techniques have proven that the complexities in the industrial applications can be met if the design is implemented on ASIC.
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Bio chemical alterations due to the impact of Lead nitrate in sublethal levels on Muscle and Hepatopancreas tissues of an economically important Shrimp Tiger Prawn Penaeus monodon
In this study the tiger shrimp Penaeus monodon subjected to lead nitrate toxicity under three sublethal concentrations (1.66,3.33 and 6.60 mg/L )for 24 hrs, 48 hrs 72 hrs and 96 hrs . The vital organs Muscle and Hepatopancreas were dissected from tiger shrimp and processed for biochemical assay .The results of Lead nitrate treated Shrimp shows a decrease in the level of Protein, Carbohydrate and Lipid comparing to the control Shrimp. The depletion results of Protein in Muscle from 65.22 to 60.45 percent ,Carbohydrate from 15.10 to12.10 percent and Lipid from 09.00 to 06.60 percent, similarly the hapatopancreas shows depletion of protein from57.48 to50.50 percent ,Carbohydrate from 18.57 to 14.42 percent and Lipid shows from 19.20 to 15.86 percent This shows depletion of three biochemical components due to the impact of Lead nitrate toxicity . Impact of Lead nitrate leads to active depletion of biochemical components of protein carbohydrate and Lipid resulting in accelerated metabolism.
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Challenges of privately sponsored students in universities in Kenya: a case of Moi University
There are many changes occurring in higher education in Kenya and the world over. These changes range from a rapid expansion in student enrolments to a proliferation of programmes and institutions offering higher education. Moi University introduced such a programme in 1998. As a result of these developments, there has arisen concern amongst the stakeholders on the quality, efficiency and effectiveness of higher education offered. The paper reports the findings of an investigation carried out in the year 2003 to determine the internal efficiency of the Privately Sponsored Students Programme at Moi University. The target population for the study was all the students enrolled in the privately Sponsored Students Programme at Moi University in the 2002/2003 academic year. Data for this study was collected by use of a questionnaire from a random sample of 300 respondents. The significant finding was Privately Sponsored Programmes operated below optimal efficiency levels. Although enrolment growth rates had been steady in the immediate past three academic years, dropping out, temporary withdrawal and other indicators of inefficiency were on the increase and therefore a source of concern. Different degree programmes demonstrated different levels of efficiently in the way they translated their inputs (students) into outputs (graduands). Students with outstanding fees balances were barred from graduating. Also, it was established that many critical performance inputs were lacking or in short supply, such as library books and journals, computers, furniture in lecture rooms and chemicals in laboratories. To reduce these inefficiencies, there is need to enhance provision of critical inputs like books and journals, computers and science equipment as well as various consumables items. There is also need to assist students to identify suitable accommodation places. In order to break barriers of suspicion between regular and self-sponsored students (PSSP) the University should work towards integrating the two groups of student as far as possible.
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Comparative analysis of Sura Anam in the interpretation of Meybodi and lahiji
matching of Surah Anam, between interpretation Lahiji and Meybodi, from their verses, sayings and quotations, grammatical problems, syntax and vocabulary, and in general, similarities and differences between these two interpretations, the subject of this investigation. Language of thought story, and his thought is language. Therefore, he expressed that the effects of language, reveal the speaker's ideational system. Meybodi is, Ashari Muslim, a follower of followers of hadith. This, in his interpretation, especially in the second innings, color and smell interpretation is clear. Lahiji, Shiite scholars is that, in place of interpretation and translation bottlenecks, and perfect knowledge of the sayings of the Imams (as) rivals, so his speech is authentic. Language is both simple interpretation, although Meybodi language because of aging, language preference, enjoying the literary spirit, and speak the language heravi Lahiji complicated. Meybodi id noted Scholar that sometimes, in the second innings, his speech is adorned with the ornament of rhyme, but Lahiji of less verbal arrangements, benefited.
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Comparison between VMWare and Oracle VirtualBox Virtualization Technologies
The main purpose of this paper is to compare the performance of the Oracle VirtualBox and VMWare virtualization technologies. The study focuses on the performance of disk I/O, memory and CPU operations under virtualization infrastructures. This performance is measured by benchmarking tools like Iozone for disk I/O performance, RAMspeed for memory performance and UnixBench for CPU performance. Results of benchmarking tools will identify which technology is better than other and in what respect.
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Contributing factors and consequences of childhood obesity – An analysis using Induced Fuzzy Cognitive Maps (IFCMs)
Obesity is now a common childhood disease and is widely acknowledged as having become a global epidemic. There are well-recognized health consequences of childhood obesity, both during childhood and adulthood, affecting health and psychological welfare. Childhood obesity is a risk factor for adult morbidity and mortality, independent of body mass index (BMI) in adulthood, family history of cardiovascular disease or cancer, and smoking. The present study was designed with the objectives to study contributing factors of childhood obesity like genetic, environmental, behavioral, metabolic, biochemical and social factors and its relationship. Hence, this research investigates the most contributing / impactful factor of childhood obesity using Induced Fuzzy Cognitive Maps (IFCMs). IFCMs are a fuzzy-graph modeling approach based on expert’s opinion. This is the non-statistical approach to study the problems with imprecise information.
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Credibility and Privacy Issues in Social Networking Use Among Saudi Young People
Information on social media platforms suffers from a relative lack of professional gatekeepers to monitor content. Therefore, credibility and privacy on social media platform has become important issues for today information consumers. This study aims at exploring Saudi Youths' trends toward some social networking issues which are credibility, and privacy and how their awareness of these controversial issues affect their use of social media. The study is based on a survey with a sample size of 300 young people from Saudi university. The findings indicate that Saudi students reported that the information found on social network sites are not credible, and they are worried about their privacy when using any social network sites.
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Cultivating Lesson Interpretation Skills of Normal Students in Physics for the Purpose of Fostering Excellent Teachers
Lesson interpretation is an effective teaching and research activity performed by teachers. Physics teachers’ lesson interpretation aims to represent, explain or translate content and knowledge of physic by their own strategies and methods. Lesson interpretation has played a leading role in educating normal students in physics. In order to cultivate excellent physics teachers, normal universities should strengthen the teaching and practice of lesson interpretation.
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