Mamun Kabir S.M.,Bangladesh University of Textiles |
Koh J.,Konkuk University
Coloration Technology | Year: 2017
Sea-island-type, black dope-dyed poly(ethylene terephthalate) microfibre fabrics were compared with normal sea-island-type PET microfibres in terms of their thermal properties, alkaline weight reduction, and dyeing properties. A comparison of the weight reduction behaviours of the two microfibre yarns revealed that the microfibre yarn containing carbon black exhibited a higher dissolution speed than that containing no carbon black. The incorporation of carbon black particles in the polyester fibre matrix therefore accelerates the degradation of the less crystalline sea component during alkali treatment. A cationic dye staining method was used to monitor the alkaline dissolution behaviour of the sea-island-type PET microfibres, and compared with the K/S values and the colour difference, the fk value is the most-desirable indicator for determination of the termination point of the alkaline dissolution process. The colour strength and the colour fastness of the dope-dyed sea-island-type PET microfibre fabrics are superior to those of the normal type. © 2017 Society of Dyers and Colourists.
Moin C.J.,Ahsanullah University of Science and Technology |
Doulah A.B.M.S.U.,Ahsanullah University of Science and Technology |
Ali M.,Bangladesh University of Textiles |
Sarwar F.,Bangladesh University of Engineering and Technology
Journal of the Textile Institute | Year: 2017
Appropriate operating procedure plays a vital role in any production process for improving the quality of the final product An export oriented knit apparel manufacturing industry in Bangladesh was assessed initially and an Operating Procedure for Quality Conformation (OPQC) was applied at production process for quality improvement. The improvements were assessed twice. First assessment was done at seventh month and second assessment at ninth month after implementation of OPQC. Actions were taken considering the feedbacks from each assessment. As a result fabric (in terms of garment) loss % from cutting to final inspection was reduced and found 5.42, 4.65 and 1.19 at initial, first and second assessment, respectively. Assessment by process capability analysis shows the improvements of Cp and Cpk from 0.38 to 0.78 and −0.35 to 0.44 from start to end of process at second assessment. Similarly Taguchi quality loss (% of order value) was reduced in each assessment and was found 10.88, 9.66 and 3.98% at initial, first and second assessment respectively. Moreover, process capability analysis and Taguchi quality loss analysis directed the manufacturer to the next steps for quality improvement. © 2017 The Textile Institute
Kandola B.K.,University of Bolton |
Ebdon J.R.,University of Bolton |
Chowdhury K.P.,University of Bolton |
Chowdhury K.P.,Bangladesh University of Textiles
Polymers | Year: 2015
Novel blends of two furan resins with an unsaturated polyester have been prepared and cured by parallel free radical (for the unsaturated polyester) and acid-catalysed crosslinking (for the furan resin) to give co-cured composite materials. Although these materials have inferior physical properties, such as low Tg and low storage modulus compared with those of unsaturated polyester and furan resins alone, they show markedly improved flame retardance compared with that of the normally highly flammable unsaturated polyester. This increased flame retardance arises from a condensed phase mechanism in which the furanic component forms a semi-protective char, reducing rates of thermal degradation and total heat release and heat of combustion. The blends also burn with reduced smoke output compared with that from unsaturated polyester alone. © 2015 by the authors.
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.
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
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.
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.
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.
Hasan M.,Bangladesh University of Textiles |
Nur K.M.,Stamford University Bangladesh
Proceeding of the 15th International Conference on Computer and Information Technology, ICCIT 2012 | Year: 2012
User authentication through password matching is an age-old issue. It has been popularly being used in the computing world for its simplicity, flexibility and remote accessibility. Although people later developed and deployed some other authentication systems like Biometrics Authentication and Token-Based Authentication; despite proving higher degree of security, they all suffer from an orthodox problem-remote accessibility to an Internet-Based System. Again, for remote access, the general trend of using textual passwords is not guaranteed to be highly secured and, most often, they are seen breached by the intruders using some common password breaking algorithms. Hence, a more reliable, robust, secured and allover simple authentication system for remote accessibility is yet needed in digital world. In this paper, we propose a 3-Layer user authentication system for remote access of Internet-based systems that is guaranteed to be more secured, robust and reliable as compared to its existing counterparts. Besides, the proposed system ensures flexibility, reduced complexity and simplicity as well. © 2012 IEEE.
PubMed | Bangladesh University of Textiles and Dhaka University of Engineering and Technology
Type: | Journal: SpringerPlus | Year: 2015
The objective of the study is to investigate the effect of introducing jute yarn on the mechanical properties of concrete. Jute fibre is produced abundantly in Bangladesh and hence, very cheap. The investigation on the enhancement of mechanical properties of concrete with jute yarn as reinforcement, if enhanced, will not only explore a way to improve the properties of concrete, it will also explore the use of jute and restrict the utilization of polymer which is environmentally detrimental. To accomplish the objective, an experimental investigation of the compressive, flexural and tensile strengths of Jute Yarn Reinforced Concrete composites (JYRCC) has been conducted. Cylinders, prisms and cubes of standard dimensions have been made to introducing jute yarn varying the mix ratio of the ingredients in concrete, water cement ratio, length and volume of yarn to know the effect of parameters as mentioned. Compressive, flexural and tensile strength tests had been conducted on the prepared samples by appropriate testing apparatus following Standards of tests. Mechanical properties of JYRCC were observed to be enhanced for a particular range of lengths of cut (10, 15, 20 and 25mm) and volume content of jute yarn (0.1, 0.25, 0.5 and 0.75%). The maximum increment of compressive, flexural and tensile strengths observed in the investigation are 33, 23 and 38%, respectively with respect to concrete without jute yarn.