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Dhaka, Bangladesh

Bangladesh University of Textiles , is the first-ever and only public university in Bangladesh specializing in Textile Engineering. Wikipedia.

Mamun A.A.,Jahangirnagar University | Zobaer M.S.,Bangladesh University of Textiles
Physics of Plasmas | Year: 2014

The properties of ion-acoustic shock waves and double layers propagating in a viscous degenerate dense plasma (containing inertial viscous ion fluid, non-relativistic and ultra-relativistic degenerate electron fluid, and negatively charged stationary heavy element) is investigated. A new nonlinear equation (viz. Gardner equation with additional dissipative term) is derived by the reductive perturbation method. The properties of the ion-acoustic shock waves and double layers are examined by the analysis of the shock and double layer solutions of this new equation (we would like to call it "M-Z equation"). It is found that the properties of these shock and double layer structures obtained from this analysis are significantly different from those obtained from the analysis of standard Gardner or Burgers' equation. The implications of our results to dense plasmas in astrophysical objects (e.g., non-rotating white dwarf stars) are briefly discussed. © 2014 AIP Publishing LLC. Source

Hasanuzzaman M.,University of Malaya | Rahim N.A.,University of Malaya | Hosenuzzaman M.,Bangladesh University of Textiles | Saidur R.,University of Malaya | And 2 more authors.
Renewable and Sustainable Energy Reviews | Year: 2012

Energy efficiency and savings strategies in the combustion based industrial process heating has been reviewed comprehensively and presented in this paper. This work compiles latest literatures in terms of thesis, journal articles, conference proceedings, web materials, reports, books, handbooks on industrial process heating systems in the industrial sector. Different types of equipment used (i.e., recuperator, regenerators, heat wheels, heat pipes, economizers, etc.) and energy savings are reviewed in various industrial processes heating. Based on the review results, it is found that significant amounts of energy could be saved by using heat recovery system in the industrial process heating. By using recuperator up to 25% energy can be saved in the furnace. In the case of boiler, by using economizers 10% to 20% energy can be saved. Economic analysis shows that the payback period of recuperator and economizer are normally less than 2 years. It is also found that the payback period is lower when operating hour is comparatively high. © 2012 Elsevier Ltd. All rights reserved. Source

Fatema U.K.,Bangladesh University of Textiles | Okino F.,Shinshu University | Gotoh Y.,Shinshu University
Journal of Materials Science | Year: 2014

The influence of heating conditions on the structure of hollow carbon fibers (H-CFs) during their fabrication from solid poly(vinyl alcohol) (PVA) fibers is reported. The hollow structure of PVA-derived carbon was formed by selective iodination and subsequent stabilization of precursor PVA fiber close to the fiber surface followed by carbonization. The broadening of X-ray diffraction peaks due to disorder and the small size effects of the (002) plane were strongly reduced by increasing the heat treatment temperature (HTT) from 800 to 3000 C, but the asymmetric shape of (10) and (110) reflections suggests turbostratic layer stacking. The increase of HTT to 3000 C increased the degree of graphitization evident from the decrease of interplanar spacing from 0.360 to 0.338 nm and the intensity ratio of D to G bands in Raman spectra from 0.93 to 0.58. The crystallite size, orientation and electrical conductivity of the resultant H-CFs were also improved with higher HTT. Besides, the size of the hollow core was also influenced by the HTT and both wall thickness and carbon yield decreased with higher HTT. The core of the H-CFs could be easily filled with polymer by bulk polymerization of monomer. © 2013 Springer Science+Business Media New York. Source

Hossain M.F.,Bangladesh University of Textiles | Gong R.H.,University of Manchester | Rigout M.,University of Leeds
Journal of the Textile Institute | Year: 2016

Hydroxypropyl-β-cyclodextrin (HP-β-CD) is a β-cyclodextrin (β-CD) derivative which is toxicologically harmless to mammals and other animals. In this study, HP-β-CD is electrospun from an aqueous solution by blending with poly(ethylene oxide) (PEO). The aqueous solutions containing different HP-β-CD/PEO blends (50:50–90:10) with varying concentrations (4–12 wt.%) were electrospun at 1 ml/h feed rate, 12 cm working distance and 7 kV applied voltage. The morphology of the nanofibres was investigated by scanning electron microscope. The average diameter of the nanofibres was measured using ImageJ software. It was found from the results that the uniform nanofibres with an average diameter of 264, 244 and 236 nm were obtained from 8 wt.% solution of 50:50, 60:40 and 70:30 HP-β-CD/PEO blends, respectively. The average diameter of the fibre decreases with increasing HP-β-CD/PEO ratio. However, higher proportion of HP-β-CD (i.e. above 70:30 HP-β-CD/PEO blend) in the spinning solution increases the possibility of creating more beads in the fibres. Although the polymer concentrations have not shown a significant effect on fibre diameter, the 8 wt.% solution of 50:50 HP-β-CD/PEO yielded uniform smooth fibres with the narrowest distribution of the diameters. As the aim of this study is to maximize the HP-β-CD content in the fibre, the blend ratio of 70:30 HP-β-CD/PEO and solution concentration of 8 wt.% were optimized to obtain smooth HP-β-CD/PEO nanofibres. © 2016 The Textile Institute Source

Asaduz-Zaman M.,Bangladesh University of Textiles | Chowdhury A.H.,Bangladesh University of Engineering and Technology
2nd International Conference on Electrical Engineering and Information and Communication Technology, iCEEiCT 2015 | Year: 2015

Interconnected microgrid system enhance reliability and reduce spinning reserve due to higher redundancy. It is useful for areas where conventional power grid cannot be connected. This paper presents optimal economic dispatch strategy of distributed generation where two microgrids and a single energy storage system (ESS) are interconnected together. Genetic algorithm is used to minimize the operating cost of the proposed system and to find out the optimum value of the output power produced by distributed generator. The objective function comprises of fuel cost, operation and maintenance cost, as well as cost of emissions. One of the microgrids consists of diesel engine generator, microturbine generator, solar PV and another with fuel cell and wind turbine generator. The ESS is charged from the interconnected microgrids and can be used for load frequency regulation and spinning reserve of the system. © 2015 IEEE. Source

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