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Search Results: 1 - 10 of 2606 matches for " Aminul Islam "
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Detection of Mechanical Deformation in Old Aged Power Transformer Using Cross Correlation Co-Efficient Analysis Method  [PDF]
Asif Islam, Shahidul Islam Khan, Aminul Hoque
Energy and Power Engineering (EPE) , 2011, DOI: 10.4236/epe.2011.34073
Abstract: Detection of minor faults in power transformer active part is essential because minor faults may develop and lead to major faults and finally irretrievable damages occur. Sweep Frequency Response Analysis (SFRA) is an effective low-voltage, off-line diagnostic tool used for finding out any possible winding displacement or mechanical deterioration inside the Transformer, due to large electromechanical forces occurring from the fault currents or due to Transformer transportation and relocation. In this method, the frequency response of a transformer is taken both at manufacturing industry and concern site. Then both the response is compared to predict the fault taken place in active part. But in old aged transformers, the primary reference response is unavailable. So Cross Correlation Co-Efficient (CCF) measurement technique can be a vital process for fault detection in these transformers. In this paper, theoretical background of SFRA technique has been elaborated and through several case studies, the effectiveness of CCF parameter for fault detection has been represented.
High Pressure Water-Jet Technology for the Surface Treatment of Al-Si Alloys and Repercussion on Tribological Properties  [PDF]
Md. Aminul Islam, Zoheir Farhat, Jonathon Bonnell
Journal of Surface Engineered Materials and Advanced Technology (JSEMAT) , 2011, DOI: 10.4236/jsemat.2011.13017
Abstract: Recent developments in high pressure water-jet technology have brought the process to the forefront as a means of surface treatment. Water jet technology offers cleaning, cutting, processing as well as potential refinement of surface properties. By adapting the process parameters the surface characteristics can be changed while the profile remains the same. In the present study, water-jet technology was used for the surface treatment of Al-Si alloy to investigate its effect on tribological properties. Dry sliding wear behavior was investigated against AISI 52100 bearing steel ball using a reciprocating ball-on-flat configuration. Optical microscopy examination reveals that ploughing of grains, transgranular and intergranular propagation of cracks; are the mechanisms by which material is removed during water jet treatment. While, on the other hand, SEM observation of the wear track reveals that plastic deformation and delamination are the dominant wear mechanism during the wear process. Water jet treatment was compared to hot isostatic pressing in terms of its effects on wear resistance and surface porosity of Al-Si alloy. It was found that, hot isostatic pressing reduces the total amount of porosity at the expanse of hardness while water jet treatment produces a compressed surface having higher hardness and compressive residual stress, which ultimately increases wear resistance.
Feasibility Study of Smart Grid in Bangladesh  [PDF]
Faysal Nayan, Md. Aminul Islam, Shifat Mahmud
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B290
Abstract:

The agenda of this paper is to discuss about the significance and a detailed feasibility study of practical implementation of Smart Grid in Bangladesh. Smart grid refers to an electric power system that enhances grid reliability and efficiency by automatically responding to system disturbances. Power crisis is a major problem for a developing country like Bangladesh. Efficient transmission and distribution of electricity with essential energy resources is a fundamental requirement to provide citizens and economies. The paper analyzes the characteristics of Smart Grid and a comparative analysis with conventional grid system. It also discusses about the efficient transmission and distribution process which will integrate power system with renewable energy and information system.

Mix design of high-performance concrete
Laskar, Aminul Islam;
Materials Research , 2011, DOI: 10.1590/S1516-14392011005000088
Abstract: a mix design procedure for high-performance concrete mixes has been presented in this paper. since rheological parameters and compressive strength are fundamental properties of concrete in two different stages of production, the correlation between rheological parameters and compressive strength has been used instead of using water-cement ratio versus compressive strength relationship. water-cement ratio and aggregate volume to paste volume ratio has also been determined from rheological behavior and used in the mix design. in the proposed method, the designer is able to estimate rheological parameters like yield stress and plastic viscosity at the design stage for a given target strength, in addition to ingredients of concrete.
Correlating slump, slump flow, vebe and flow tests to rheological parameters of high-performance concrete
Laskar, Aminul Islam;
Materials Research , 2009, DOI: 10.1590/S1516-14392009000100009
Abstract: conventional single-point workability tests continue to be used for specification and quality control of concrete despite their inherent limitations. these tests cannot characterize workability of concrete in terms of fundamental rheological parameters. attempt has therefore been made to correlate slump, slump flow, slump flow time, percent flow and vebe time to rheological parameters of high-performance concrete. thirty numbers of concrete mixes without steel fibers and with steel fibers of specific dose have been considered during experiment. it has been observed that rheological parameters can be correlated to slump and slump flow. in case of fiber reinforced concrete, there is a decrease in percent flow with the increase in rheological parameters. vebe time, however, remains unchanged up to yield stress 500 pa and plastic viscosity 40 pa.s beyond which it steeply increases with further increase in yield stress and plastic viscosity. flow test may be a better test for frc as it is sensitive over all ranges of workability of concrete.
The Plight of Illegal Migrant Workers in South Korea: Loss of Inhabitant Cultural Values and Involvement in Internal Conflicts
Aminul Islam Sumon
Pakistan Journal of Social Sciences , 2012,
Abstract: International migration, especially illegal migrant work and workers human rights, is one of the most complex issues in the present world. In the beginning of the 1990s, South Korea emerged as a labor receiving country. According to the Amnesty International Report 2006, around 189,000 of 360,000 migrant workers are illegal in South Korea. The present research examines the various socio-cultural aspects of illegal migrant workers work and personal life in the host society. Migrant people inhabit in a dual cultural schema, which makes their life complex. Sometimes it becomes difficult for them to maintain their cultural dualism. Findings of the present research show that migrant workers often ignore many of their inherited cultural attributes in the host country. Their inability to handle cultural dualism contributes to their predicament. Migrant workers are also found to be involved in conflicts with people of the same cultural backgrounds, which further complicate their life and exacerbate their security and wellbeing in their precarious life. The research follows a mixed methods approach to data collection and analysis. Three-month intensive fieldwork, formal and informal interviews and case studies of key informants are the principal techniques use for collecting the data. The research site is located in the Jeonju city of Jeollabuk-do province in South Korea. It is to be hoped that the insights generated by this research will be helpful in enhancing their human rights and improving their overall wellbeing in the host country.
Power optimized variation aware dual-threshold SRAM cell design technique
Aminul Islam,Mohd Hasan
Nanotechnology, Science and Applications , 2011,
Abstract: Aminul Islam1, Mohd Hasan21Department of Electronics and Communication Engineering, Birla Institute of Technology, Mesra, Ranchi, Jharkhand, India; 2Department of Electronics Engineering, Aligarh Muslim University, Aligarh, Uttar Pradesh, IndiaAbstract: Bulk complementary metal-oxide semiconductor (CMOS) technology is facing enormous challenges at channel lengths below 45 nm, such as gate tunneling, device mismatch, random dopant fluctuations, and mobility degradation. Although multiple gate transistors and strained silicon devices overcome some of the bulk CMOS problems, it is sensible to look for revolutionary new materials and devices to replace silicon. It is obvious that future technology materials should exhibit higher mobility, better channel electrostatics, scalability, and robustness against process variations. Carbon nanotube-based technology is very promising because it has most of these desired features. There is a need to explore the potential of this emerging technology by designing circuits based on this technology and comparing their performance with that of existing bulk CMOS technology. In this paper, we propose a low-power variation-immune dual-threshold voltage carbon nanotube field effect transistor (CNFET)-based seven-transistor (7T) static random access memory (SRAM) cell. The proposed CNFET-based 7T SRAM cell offers ~1.2× improvement in standby power, ~1.3× improvement in read delay, and ~1.1× improvement in write delay. It offers narrower spread in write access time (1.4× at optimum energy point [OEP] and 1.2× at 1 V). It features 56.3% improvement in static noise margin and 40% improvement in read static noise margin. All the simulation measurements are taken at proposed OEP decided by the optimum results obtained after extensive simulation on HSPICE (high-performance simulation program with integrated circuit emphasis) environment.Keywords: carbon nanotube field effect transistor (CNFET), chirality vector, random dopant fluctuation (RDF), SNM
Rethinking crop diversification under changing climate, hydrology and food habit in Bangladesh
Aminul Islam Akanda
Journal of Agriculture and Environment for International Development , 2011,
Abstract: Extreme temperature, frequent and intensive flood, cyclone and other natural disasters due to climate change became acute in Bangladesh and would be severe in future. Besides, water crisis due to shortage of upstream flow and very little rainfall in dry season would affect in a same way. Gradual higher dependency on groundwater irrigation during last few decades created pressure on groundwater even after a huge discharge during rainy season. Using secondary data, this research analyzed the changes in cropping pattern along with a forecast of area to be distributed among various crops in 2029-30 and proposed a re-distribution considering probable crop failure, water crisis and change in food habit. Inherit rice-dominated food habit and government incentive policy encouraged farmers to be concentrated highly on water-intensive rice farming. However, a recent tendency of less rice consumption would encourage crop diversification in future. An incentive policy for farming of diversified crops and their intensification in all crop seasons would be effective to reduce pressure on groundwater and to persuade a balanced food basket in Bangladesh.
Correlation between Compressive Strength and Rheological Parameters of High-Performance Concrete
Aminul Islam Laskar,Sudip Talukdar
Advances in Materials Science and Engineering , 2007, DOI: 10.1155/2007/45869
Abstract: Compressive strength is greatly influenced by the performance of concrete in its fresh stage such as uniform mixing, proper compaction, resistance to segregation during transporting and placing. Attempt has, therefore, been made to correlate compressive strength to the rheological behavior of high performance concrete with a modified setup of parallel plate rheometer. Modified setup considers the shearing of concrete at the centre of the cylindrical container that takes into account the resistance between concrete and the vertical side of the wall. It has been observed that compressive strength increases steeply as the yield strength increases up to a certain level. Plastic viscosity, however, shows optimum value for maximum compressive strength.
An Empirical Investigation into the Underpricing of Initial Public Offerings in the Chittagong Stock Exchange
Md. Aminul Islam,Ruhani Ali,Zamri Ahmad
International Journal of Economics and Finance , 2010, DOI: 10.5539/ijef.v2n4p36
Abstract: Over the years, hundreds of empirical studies have been carried out and theoretical literature written to enhance people’s knowledge towards initial public offering (IPO), IPO underpricing, IPO flipping, IPO short profit, IPO long run underperformances; yet it is arduous for people to clearly understand the various issues related to IPOs especially with different types of equities in different industries and in different markets. The degree of underpricing varies from one issue to another. The degree of underpricing in the Bangladesh capital market is rather high compared to that of other Asian and advanced stock markets. This study analyzes the levels of underpricing in IPOs and its determinants of the Chittagong Stock Exchange (CSE). Key trends in the levels of underpricing and overpricing are highlighted out on a year to year, and industry to industry basis. Out of the 117 companies that were listed in the years 1995 to 2005, 102 (87.18%) IPOs were found to be underpriced, 13 (11.11%) overpriced while only 2 were accurately priced. The overall level of overpricing was 15.37% with a standard deviation of 18.89. Regression Analysis shows that offer size, and size of the company is positively related to the degree of underpricing. The industry type and age of the firm are found to be negatively related to the degree of underpricing. However timing of offer was found to have no significant influence on the degree of underpricing of IPOs in the Chittagong Stock Exchange.
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