Van Maren D.S.,Deltares |
Van Maren D.S.,Technical University of Delft |
Liew S.C.,National University of Singapore |
Hasan G.M.J.,Shahjalal University of Science and Technology |
Hasan G.M.J.,Bangladesh Institute of Technology
Continental Shelf Research | Year: 2014
In past decades, the turbidity in Singapore's coastal waters has been increased. This has led to reduced visibility and increased siltation rates, detrimental for the coral reefs and other sensitive ecosystems around Singapore. The reasons for this increased turbidity are poorly known because little quantitative information exists on sediment dynamics around Singapore, on changes in sediment sources, and on the physical environment. Therefore we set out to quantify the effect of fluvial contributions on changes in sediment dynamics, using a combination of numerical models, satellite images, and hydrodynamic and sedimentary data. Results indicate that the main fluvial source enters an ebb-dominant estuary, with sediment export primarily balanced by settling/scour lags rather than estuarine circulation. A large part of the sediment load enters the Singapore Strait, where the large-scale marine currents effectively transport most sediment towards the coral reefs. However, mixing with marine water masses in both the estuary and the adjacent Singapore Strait sufficiently dilutes this fluvial sediment source to have a negligible impact on Singapore's coral reefs. © 2013 Elsevier Ltd.
Fakruddin M.,Bangladesh Institute of Technology |
Hossain Z.,Bangladesh Institute of Technology |
Afroz H.,Primeasia University
Journal of Nanobiotechnology | Year: 2012
Background: Nanobiotechnology is the application of nanotechnology in biological fields. Nanotechnology is a multidisciplinary field that currently recruits approach, technology and facility available in conventional as well as advanced avenues of engineering, physics, chemistry and biology.Method: A comprehensive review of the literature on the principles, limitations, challenges, improvements and applications of nanotechnology in medical science was performed.Results: Nanobiotechnology has multitude of potentials for advancing medical science thereby improving health care practices around the world. Many novel nanoparticles and nanodevices are expected to be used, with an enormous positive impact on human health. While true clinical applications of nanotechnology are still practically inexistent, a significant number of promising medical projects are in an advanced experimental stage. Implementation of nanotechnology in medicine and physiology means that mechanisms and devices are so technically designed that they can interact with sub-cellular (i.e. molecular) levels of the body with a high degree of specificity. Thus therapeutic efficacy can be achieved to maximum with minimal side effects by means of the targeted cell or tissue-specific clinical intervention.Conclusion: More detailed research and careful clinical trials are still required to introduce diverse components of nanobiotechnology in random clinical applications with success. Ethical and moral concerns also need to be addressed in parallel with the new developments. © 2012 Fakruddin et al.; licensee BioMed Central Ltd.
Khan M.A.,Bangladesh Institute of Technology |
Hossain M.U.,Mawlana Bhashani Science and Technology University |
Rakib-Uz-Zaman S.M.,Shahjalal University of Science and Technology |
Morshed M.N.,Bangladesh Institute of Technology
Scandinavian Journal of Immunology | Year: 2015
Ebola viruses (EBOVs) have been identified as an emerging threat in recent year as it causes severe haemorrhagic fever in human. Epitope-based vaccine design for EBOVs remains a top priority because a mere progress has been made in this regard. Another reason is the lack of antiviral drug and licensed vaccine although there is a severe outbreak in Central Africa. In this study, we aimed to design an epitope-based vaccine that can trigger a significant immune response as well as to prognosticate inhibitor that can bind with potential drug target sites using various immunoinformatics and docking simulation tools. The capacity to induce both humoral and cell-mediated immunity by T cell and B cell was checked for the selected protein. The peptide region spanning 9 amino acids from 42 to 50 and the sequence TLASIGTAF were found as the most potential B and T cell epitopes, respectively. This peptide could interact with 12 HLAs and showed high population coverage up to 80.99%. Using molecular docking, the epitope was further appraised for binding against HLA molecules to verify the binding cleft interaction. In addition with this, the allergenicity of the epitopes was also evaluated. In the post-therapeutic strategy, docking study of predicted 3D structure identified suitable therapeutic inhibitor against targeted protein. However, this computational epitope-based peptide vaccine designing and target site prediction against EBOVs open up a new horizon which may be the prospective way in Ebola viruses research; the results require validation by in vitro and in vivo experiments. © 2015 John Wiley & Sons Ltd.
Ahiduzzaman M.,Bangladesh Institute of Technology |
Islam A.K.M.S.,Islamic University of Technology
Renewable and Sustainable Energy Reviews | Year: 2011
Bangladesh is an energy starving country. The country will be on one of the fast growing power markets with its population and growing energy demand per person, its fast growing urbanization, and its socio-economic development. At present the potential demand of power is 5569 MW and the supply is below 4000 MW. The country is dependent on the imported petroleum that is big burden on the economy. The per capita emission is only 0.2667 tonne per person still much below the world leading countries (19.8 tonne per person for USA). However, Bangladesh is one of the most vulnerable to climate change effect in the world. In this regard, renewable energy resources appear to be the one of the most efficient and effective solution for clean and sustainable energy development in Bangladesh. Biomass is the dominating source of energy in Bangladesh. Biomass energy is used in a very traditional way. Biomass conversion to energy in the form of liquid, gaseous and solid pellet or briquette could be a viable option to reduce the pressure on the conventional fossil fuel. The geographical location of Bangladesh has several advantages for extensive use of grid connected solar electricity and stand alone solar PV system. This article presents a review of the potential and utilization of the renewable energy sources in Bangladesh. © 2011 Elsevier Ltd. All rights reserved.
Yasmeen R.,Bangladesh Institute of Technology |
Mahmood M.S.,Bangladesh Institute of Technology
Annals of Nuclear Energy | Year: 2016
Research reactors are used as neutron generators in contrast to power reactors in which energy production is the prime issue. To make neutrons available outside the reactor core, beam ports are designed around the core. These beam ports can be characterized by neutron flux level which is useful for neutron beam application in a reactor. The neutron and gamma flux variation was studied as a function of different orientations of beam tubes and optimally minimum information is produced to understand neutron beam design and use. An optimum core has been modeled based on TRIGA research reactor, defined as base model. Three optimal combinations of piercing, tangential and radial beam ports have been studied against the base model. Along with beam port characterization, the effect of beam ports on the core has been also studied in reverse in terms of reactivity variation and neutron flux distribution inside the core. Such characterization is useful where preliminary calculations are needed for avoiding detailed computer calculation to model the beam. © 2016 Elsevier Ltd. All rights reserved.
Chowdhury R.R.,Bangladesh Institute of Technology |
Kabir M.S.,Bangladesh Institute of Technology
2014 International Conference on Informatics, Electronics and Vision, ICIEV 2014 | Year: 2014
This research paper carries out a proposal to implement an efficient way to electrify the streets of Dhaka, the capital of Bangladesh, using solar power. Recently, government has launched a project named 'Solar Photovoltaic-Powered LED (Light Emitting Diode) Street Lighting' to electrify the streets of Dhaka using only solar panels. Under the prevailing project, 122 LED lights, each of 30W are installed to electrify approximately 2 km streets. But after implementation, it has been found that 60-100W LED light is required for adequately illuminating the streets which will allow the ADB fund to cover only 250-300 km streets. Our proposal is to use the solar panels implemented in this project more efficiently and to carry out a realistic experimental approach to enhance the solar output power to a significant level with the application of solar concentrator and piezoelectric energy harvesting circuit. The method is arranged using 'Double Sun Technology'. A remarkable enhancement in the output power is achieved with this method. Rather than using only a solar panel, the output power increases by 12.14% by using a photovoltaic (PV) panel with two flat mirrors as concentrator. To implement the project more efficiently, the concept of piezoelectricity have been introduced. In this paper, piezoelectric-based energy-harvesting technology is applied to generate electricity from roadways. The piezoelectric energy harvesting circuit was designed and simulated in PSPICE. A voltage doubler and a bridge rectifier were wired to the equivalent circuit model of the piezoelectric materials. The vibration present on the roadways from the movement of the vehicles was applied in the form of voltage to the energy harvesting circuit. The goal of this experiment is to investigate whether piezoelectricity would be able to provide sufficient source of voltage to charge the parent battery in case of rainy or cloudy days. © 2014 IEEE.
Sanjidah S.,Bangladesh Institute of Technology
2nd International Conference on Electrical Engineering and Information and Communication Technology, iCEEiCT 2015 | Year: 2015
A framework for analyzing the effect of a non uniform source/drain (S/D) doping profile on triangular tri-gate FinFET considering the compact modeling is presented. This paper demonstrates a fully physical model for triangular tri-gate leakage distribution due to variation of S/D doping. Fixed S/D doping can remarkably suppress short channel effect which is responsible for sub-threshold conduction. The proposed model predicts that the non uniform doping increases short channel effect as well as sub-threshold conduction and due to which a large increase in leakage current is obtained. We also investigated the impact of S/D doping on geometrical parameters such as fin height and fin width. Using Monte Carlo simulation a random variation of leakage current associated with parameter variation can be found that also predicts the dependency of leakage current on threshold voltage. © 2015 IEEE.
Fakruddin M.,Bangladesh Institute of Technology |
Chowdhury A.,Bangladesh Institute of Technology
American Journal of Biochemistry and Biotechnology | Year: 2012
Problem statement: Pyrosequencing has the potential to rapidly and reliably sequence DNA taking advantages over traditional Sanger di-deoxy sequencing approach. Approach: A comprehensive review of the literature on the principles, applications, challenges and prospects of pyrosequencing was performed. Results: Pyrosequencing is a DNA sequencing technology based on the sequencing-by-synthesis principle. It employs a series of four enzymes to accurately detect nucleic acid sequences during the synthesis. Pyrosequencing has the potential advantages of accuracy, flexibility, parallel processing and can be easily automated. Furthermore, the technique dispenses with the need for labeled primers, labeled nucleotides and gel-electrophoresis. Pyrosequencing has opened up new possibilities for performing sequence-based DNA analysis. The method has been proven highly suitable for single nucleotide polymorphism analysis and sequencing of short stretches of DNA. Pyrosequencing has been successful for both confirmatory sequencing and de novo sequencing. By increasing the read length to higher scores and by shortening the sequence reaction time per base calling, pyrosequencing may take over many broad areas of DNA sequencing applications as the trend is directed to analysis of fewer amounts of specimens and large-scale settings, with higher throughput and lower cost. Conclusion/Recommendations: The Competitiveness of pyrosequencing with other sequencing methods will be improved in future. © 2012 Science Publications.
Hossain A.,Bangladesh Institute of Technology |
Alam M.S.,Bangladesh University of Engineering and Technology
International Conference on Advanced Communication Technology, ICACT | Year: 2010
Analysis of the effects of thermal and external stress on the properties of solid core photonic crystal fibers has been carried out in this work by using the finite element method. The external stress acting on the fiber induces a specific stress distribution on the fiber's cross section making the isotropic fiber material birefringent. The effective index of the fiber under stress decreases almost linearly with a significant increase in the birefringence over a wide operating wavelength (0.7μm-2.0μm). With the increase of the wavelength at all considered external stress (up to 4GPa), the polarization mode dispersion decreases almost linearly. The study shows that the dispersion in the photonic crystal fiber exhibits anomalous values, revealing that at specific value of external stress, the fiber exhibits specific dispersion values. Thus, the photonic crystal fiber has got tremendous potential to be used as dispersion compensating device in the field of optical communications and other fields of applications.
Islam M.N.,Bangladesh Institute of Technology
2015 18th International Conference on Computer and Information Technology, ICCIT 2015 | Year: 2015
Web interface signs such as navigation links, command buttons, thumbnails, small images, and icons are crucial elements of web user interfaces, which act as a communication artifact between the computer and the human (user). In other words, users interact with a web interface via interface signs. Designing intuitive interface sign become essential to make an effective human-computer interaction (HCI). But, a very limited HCI research has been focused on interface sign to design them intuitive for end users. In this paper, an extensive empirical user study was carried out through semi-structured interviews. The study found a set of underlying features for HCI practitioners to design intuitive interface signs in order to construct web interfaces intuitive for end users. © 2015 IEEE.