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Sylhet, Bangladesh

Shahjalal University of Science and Technology also known as SUST is a state supported not-for-profit research university located in Sylhet, Bangladesh. It is also one of the nine PhD granting research universities of Bangladesh.The university was founded by the Government of Bangladesh according to a university act in 1986 to give special importance in science and technology education. It is the first specialized science & technology university of the country. After SUST, seven more science and technology universities have been established in Bangladesh.SUST is traditionally known for research and education in the physical science and engineering. It is one of the most selective higher learning institutions, and received 40,881 undergraduate applicants for 2012-2013 session—only admitting 1,385, an acceptance rate of 3.39%. Wikipedia.

Romoli L.,University of Parma | Rashed C.A.A.,Shahjalal University of Science and Technology
International Journal of Advanced Manufacturing Technology | Year: 2015

Laser beam welding of dissimilar ferritic/martensitic stainless steels was performed in constrained butt joint configuration with the objective of identifying the influence of the melting ratio between the two base metals on the ultimate shear strength of the welds. Based on a full factorial design, experiments demonstrated that varying the incidence angle up to 45° and offsetting the focal position with respect to the materials’ interface within the limits imposed by the laser spot diameter are a reliable method to control the melting ratio and maintaining the expected resistance length at the material interface. The weld configuration parameters were correlated by means of the analysis of variance (ANOVA) method with shear resistance length and the melting ratio: the incidence of surface cracks can be significantly reduced increasing the ferritic steel area, involved in the formation of seam, over 60 % of the whole melt zone. Push-out tests performed on the specimens revealed that such a configuration has beneficial aspects on the ultimate shear strength of the seam meaning that the prevailing effect is the decreased brittleness of the weld by decreasing its carbon content under 0.5 % in weight. © 2015, Springer-Verlag London.

Hossen A.,Shahjalal University of Science and Technology | Westhues A.,Wilfrid Laurier University
Qualitative Health Research | Year: 2010

This study was an exploration of the experiences of 17 women, age 60 or more years, from Bangladesh. The women were asked about decision-making processes with respect to their access to health care and whether they perceived that there were differences based on age and sex in the way a household responds to an illness episode. The overall theme that characterized their experiences was "being in a socially excluded space." The themes that explained this perception of social exclusion included gender- and age-based social practices, gender- and class-based economic practices, religious beliefs that restricted the mobility of women, and social constructions of health and illness that led the women to avoid seeking health care. We conclude that the Bangladesh constitutional guarantee that disparities will be eliminated in access to health care between rich and poor, men and women, rural and urban residents, and younger and older citizens has not yet been realized. © The Author(s) 2010.

Das S.,University of Malaya | Das S.,Shahjalal University of Science and Technology | Wan Daud W.M.A.,University of Malaya
RSC Advances | Year: 2014

The present situation reveals the dependence on fossil fuels, which is seriously accountable for two major impediments: (i) global warming due to increasing atmospheric carbon dioxide (CO2) and (ii) the alarming consumption of energy assets. The reduction of green CO2 in terms of producing solar fuels would be an expedient accomplishment to resolve both problems, simultaneously. The review classifies different categories of photocatalysts applied in foregoing photocatalytic CO2 conversion processes with detailed information concerning operating conditions, preparation techniques and physical properties of catalysts, radiation sources, and selectivity. The categories are concentrated on metal oxides, sulfides, phosphides, and p-type and nonmetal oxide semiconductors. In addition, their modification by doping co-metals, noble metals, transition metals and non-metals for visible light response is emphasized. Besides, for harnessing solar fuel, the recent prospect and advancement of novel sensitized catalysts by dye elements, phthalocyanines and quantum dots (QDs) are also highlighted in this review. This technology needs more efficient solar active catalysts to increase production rates as well as selectivity. The recent scenario indicates that massive prospects and opportunities still exist in this area for further investigation on catalyst selection. This journal is © the Partner Organisations 2014.

Das S.,University of Malaya | Das S.,Shahjalal University of Science and Technology | Wan Daud W.M.A.,University of Malaya
Renewable and Sustainable Energy Reviews | Year: 2014

Over the past years, a serious contemplation has revealed the need to resolve two major complications: global warming due to rising levels of atmospheric carbon dioxide (CO2) and the alarming consumption of energy resources. Solar fuel production from green CO2 gas would be a convenient solution to resolve both problems simultaneously. Various conventional technologies and their limitations over CO2 transformation into fuels are reviewed in this paper. In the main stream, the review categorizes different types of photocatalysts used in previous photocatalytic conversion of CO2 processes (with detailed information regarding operating conditions, catalysts' preparation techniques, physical properties of catalysts, radiation sources, and selectivity) based on metal oxides, sulfides, phosphides, p-type and non-metal oxide semiconductors. Also, the catalysts modified by doping co-metals, noble metals, transition metals and non-metals for visible light response have been highlighted. Moreover, the recent prospect and advancement of novel sensitized catalysts by dye elements, phthalocyanines and quantum dots (QDs) for harnessing solar fuels are prominent in this outline. Reviews of this topic have also focused on the progression of photocatalytic reactors especially for CO2 photoreduction. Recently, advanced optical fibers and monolith photochemical reactors have become prominent because of their vast photon-harvesting ability. However, this technology needs more implementation with efficient catalyst selection and the development of giant solar reactors for industrial establishment. The current scenario shows that immense prospects and opportunities still exist in this area, but require further investigation and establishment. © 2014 Elsevier Ltd.

Howladar M.F.,Shahjalal University of Science and Technology
Environmental Earth Sciences | Year: 2013

The present research makes an effort towards awareness of the impact of underground coal mining on water environment around the Barapukuria coal mining area, Dinajpur by direct field investigation, questionnaire survey and laboratory analysis. For this research, the three foremost errands have been mulled over which are the water level data analysis for 10 years from 2001 to 2011, ground water major parametric analysis and the questionnaire survey on the availability of ground water before and after coal mining operation. The results of field and laboratory analysis show that the characteristics and concentrations of all the major physical and chemical parameters such as pH, EC, Temperature, HCO3 -, NO3 -, SO4 2-, Cl-, Na+, K+, Mg2+, Ca2+ and Fe(total) are still tolerable for all purposes and also within the standard limit. On the other hand, the questionnaire survey and water level data analysis confirm almost similar results regarding the depletion of water level. The water level has depleted more than 5 m from 2001 to 2011. Therefore, currently the availability of ground water is normal in the rainy and winter seasons but is slight problematic in the dry season where ground water was available at all times prior to coal mining in the area. From these scenarios, it is comprehensible that the ground water level moves downwards than earlier because of the excess pumping of water from the mine area. Besides the natural recharge condition is not enough and somewhere breaks off while some of the mines out areas are subsided, consequently the upper part of the water bearing formations (aquifer) loses its porous and permeable properties resulting water recharging problem which is directly responsible for depleting the ground water level over the area. Moreover, the water levels will also decline relative to the location, depth, recharge, and discharge conditions of the mine both aerially and vertically while there is a typical relationship between the depth of mining and static water level which is water levels will decline more as the mine goes deeper. Therefore, taking into account the current ground water condition and the depth of Barapukuria coal mine, this research implied that the water level will deplete more in day coming and the water crisis will be more for future. Thus, this research recommends a sustainable guideline for long-term planning and also suggests that regular monitoring with time to time more detail qualitative and quantitative assessments of water bodies in the area. © 2012 Springer-Verlag Berlin Heidelberg.

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