Azim M.A.,Southeast University of Bangladesh |
Mamun A.A.,United International University Dhanmondi |
Rahman M.M.,Dhaka International University
International Communications in Heat and Mass Transfer | Year: 2010
The problem of steady conjugate heat transfer through an electrically-conducting fluid for a vertical flat plate in the presence of transverse uniform magnetic field taking into account the effects of viscous dissipation, Joule heating, and heat generation is formulated. The general governing equations which include such effects are made dimensionless by means of an apposite transformation. The ultimate resulting equations obtained by introducing the stream function with the similarity variable are solved numerically using the implicit finite difference method for the boundary conditions based on conjugate heat transfer process. A representative set of numerical results for the velocity and temperature profiles, the skin friction coefficients as well as the rate of heat transfer coefficient and the surface temperature distribution are presented graphically and discussed. A comprehensive parametric study is carried out to show the effects of the magnetic parameter, viscous dissipation parameter, Joule heating parameter, conjugate conduction parameter, heat generation parameter and the Prandtl number on the obtained solutions. © 2010 Elsevier Ltd.
Agarwala N.,Southeast University of Bangladesh
Proceedings of 2013 2nd International Conference on Advances in Electrical Engineering, ICAEE 2013 | Year: 2013
The project presents the comprehensive explanation to thermoelectronics and is intended to provide the details overview of all the techniques that are used throughout this research as well as the change in behaviors of the samples due to their doping levels and nanowire lengths. As examples of practical realization of the measurement principles, the setup is for Seebeck coefficient measurements which are the result of the slope of voltage gradient over temperature gradient. The comparisons among the measurements of each setup are done in order to understand and observe the electrical contacts and transport behaviors of the samples. Throughout the investigation, an interesting result has been found that is, the control sample without any grown nanowire gives very different results from the rest of them for almost all the measurements and the current - voltage curves seem to be more ohmic with the grown nanowires samples. © 2013 IEEE.
Ripa F.A.,Southeast University of Bangladesh |
Haque M.,Southeast University of Bangladesh |
Bulbul I.J.,Southeast University of Bangladesh
Pakistan Journal of Biological Sciences | Year: 2010
The petroleum ether, chloroform and ethyl acetate fractions of ethanol extract of leaf and stem from the plant Nephelium longan (Fam-Sapindaceae) was subjected to antioxidant, antibacterial and cytotoxic activity. All the fractions showed potent antioxidant activity, of which the ethyl acetate and chloroform fraction of leaf demonstrated the strongest antioxidant activity with the IC50 value of 44.28 and 44.31 μg mL-1, respectively. The petroleum ether extracts (500 μg disc-1) of leaf and stem of N. longan almost showed no activity against the tested pathogenic organisms except Escherichia coli. On the other hand, chloroform crude extracts of leaf and stem (500 μg disc-1) showed excellent antibacterial activity with the average zone of inhibition of 13-21 mm among the tested bacteria. Besides this, ethyl acetate crude extracts showed good activity against the growth of Sarcina lutea (20 mm), Vibrio mimicus (18 mm), Salmonella typhi (18 mm), E. coli (17 mm) and Staphylococcus aureus (14 mm). However, in the brine shrimp lethality bioassay, all the crude extracts of leaf and stem possessed considerable cytotoxic activity. It was evident that, the chloroform and ethyl acetate extracts of leaf and stem have significant cytotoxic potentials with the LC50 value of 8.802, 9.587, 9.248 and 10.45 μg mL-1, respectively. Both the stem and leaf of the experimental plant have considerable antibacterial, cytotoxic and antioxidant properties which indicates that the plant have potent bioactive principles. © 2010 Asian Network for Scientific Information.
Sultana S.,Southeast University of Bangladesh |
Ripa F.A.,Southeast University of Bangladesh |
Hamid K.,Southeast University of Bangladesh
Pakistan Journal of Biological Sciences | Year: 2010
Many spices have been shown to impart an antioxidative effect in foods. This study summarized the literature on the antioxidativc effects of spices. The term spice is defined as dry plant material that is normally added to food to impart flavor. The methanolic crude extracts of Allium sativum, Coriandrum sativum, Cuminum cyminum, Zingiber officinale, Cinnamomum verum, Elettaria cardamomum and Cinnamomum tamala were screened for their free radical scavenging properties using ascorbic acid as standard antioxidant. Free radical scavenging activity was evaluated using 1,1-diphenyl-2-picryl hydrazyl (DPPH) free radical. The overall antioxidant activity of Cuminum cyminum was found to be the strongest, followed in descending order by Z. officinale, C. sativum, A. sativum, C. tamala, C. verum, E. cardamomum. The IC50 values of the extracts ranged between 15.48 and 217.431 (μg mL-1). The ascorbic acid levels was 22.78 (μg mL-1) the present study revealed that the selected plants would exert several beneficial effects by virtue of their antioxidant activity and could be harnessed as drug formulation. © 2010 Asian Network for Scientific Information.
Hossain M.S.,Southeast University of Bangladesh
Frontiers of Architectural Research | Year: 2013
The Mughal settlements are an integral part of Old Dhaka. Uncontrolled urbanization, changes in land use patterns, the growing density of new settlements, and modern transportation have brought about rapid transformation to the historic fabric of the Mughal settlements. As a result, Mughal structures are gradually turning into isolated elements in the transforming fabric. This study aims to promote the historic quality of the old city through clear and sustainable integration of the Mughal settlements in the existing fabric. This study attempts to analyze the Mughal settlements in old Dhaka and correspondingly outline strategic approaches to protect Mughal artifacts from decay and ensure proper access and visual exposure in the present urban tissue. © 2013 Higher Education Press Limited Company.
Nasrin F.,Southeast University of Bangladesh
International Journal of Pharmacy and Technology | Year: 2014
In vitro Dissolution behaviour of a poorly water-soluble drug, atorvastatin calcium (ATC) from its solid dispersion (SD) systems with poloxamer 407 (P407) has been investigated to develop a novel formulation with enhanced dissolution rate. Solid dispersion of drug-carrier ratios (1:0.5, 1:1, 1:1.5 and 1:2) prepared by solvent evaporation method, were premeditated for drug loading, saturation solubility and dissolution behavior. Saturation solubility study and dissolution test were carried out in both phosphate buffer (pH 7.4) media and distilled water. Solid dispersions were found effective to enhance the solubility of ATC significantly in all the media. In the dissolution study, SD at the ratio of 1:1 (drug: carrier) was found to be most effective, showed fastest and higher drug release. The higher ratios of poloxamer 407 (1:1.5 and 1:2) in SD were found to sustain the release rate of drug which might be owing to its gelling tendency in higher proportion at elevated temperature. Fourier Transform Infrared Spectroscopy (FT-IR) of solid dispersions with pure drug revealed no drug-carrier interactions. Thermogram and short term stability studies ensured that the prepared SDs were stable. So, solid dispersion may be an effective technique to prepare immediate and sustain release atorvastatin calcium.
Islam N.,East West University of Bangladesh |
Ullah G.M.S.,Southeast University of Bangladesh
Journal of Applied Business Research | Year: 2010
Fast food industry is a high growing sector of Bangladesh. It is concerned with the tastes and habits of the people. The food-taking habit especially in fast food segment has been changing very fast over last decade among the people of Dhaka - the capital city of Bangladesh. The reasons could be attributed by the increase of awareness, growth of education, development of information technology, and expansion of television channels and print media in Bangladesh. Hence, this paper aims at identifying the preference factors of fast food consumers living in Dhaka city. This study was conducted among the university students who usually eat fast food at their leisure time. To conduct the study, a total of 250 respondents were interviewed with a structured questionnaire. Both descriptive and inferential statistics were used in analyzing the data. Multivariate analysis technique like factor analysis was performed to identify the preference factors of the fast food student-consumers of Bangladesh. Multiple regressions were run to identify the relationship between the factors identified and the overall preference of the consumers. Results show that the consumers give most importance on brand reputation of the food item followed by nearness to receive and accessibility, similarity of taste with previous experience, cost and quality of the food, discount and taste, cleanliness and hygiene, salesmanship and decoration, fat and cholesterol level, and self-service factors. This study suggests that the brand reputation, nearness and accessibility, similarity in taste, and cost and quality relationship should be emphasized to improve the attraction of the university students towards the fast food items in Bangladesh.
Debnath K.B.,Southeast University of Bangladesh
Proceedings of the International Astronautical Congress, IAC | Year: 2012
Earth is the only habitable planet for life form. Life started to develop on earth approximately 4.5 billion years ago. But human beings appeared on earth about 2.5 million years ago. For a good future of mankind it is important to ensure the food safety; energy safety; safety from global warming, sea level rise, another ice age, asteroids and other space component which can create partial or full mass destruction on earth. According to known facts we are alone in the solar system. But there are planets which can be developed into habitable human colonies. Living outside the earth is a challenge to human kind whether in space or in a distant planet. In micro or less gravity environment we are neither adopted nor comfortable for many issues like temperature, air pressure, dryness, radiation etc. To make those habitats livable, an architect can contribute by designing an efficient and comfortable functional space to accommodate the researches. This study will help to understand the architectural attributes of International Space Station and other ongoing different design concepts of human habitation modules or colonies which will contribute in determining the architectural features which should be considered while designing the outer space or other planetary surface human habitats. The main focus of this study is the architectural features of the interior space which influences the psycho-physiological well-being of the researchers. In terms of human centered design logic, in long duration space missions, colors, light and interior decor must have among their purposes: psycho-physiological well-being, orientation, and supportiveness for all activities. It is therefore necessary to recall, through stimulating elements, the "normality" in confined artificial environments. Physical and psychological conditions can be improved featuring variety and natural variations occurring in time according to the principle of natural design. The architects can organize these confined spaces in an effective space. For these reason the need for their involvement stemmed from the push to extend space mission durations and address the needs of astronauts including but beyond minimum survival needs. In the future the space will be human kind's main destination for energy, habitation, tourism, industries etc. These features will help to increase the efficiency of the astronauts and decrease the effect of long term space missions. It is therefore necessary to design a better environment with the use of colour, light, art and activity spaces which will create an adaptive space within a confined artificial environment. Copyright© (2012) by the International Astronautical Federation.
Rashid Md.S.,Southeast University of Bangladesh
Lecture Notes in Electrical Engineering | Year: 2013
The purpose of this chapter is to explore the impact of quick response (QR) issue on demand driven supply chain management (SCM) and to establish an objective measure for the implementation of QR in apparel supply chain to remain competitive in global fashion market. This research work is based on critical review and synthesis from prior conceptual paper to get a measure of QR. This chapter fabricates the suitability of QR business strategy in SCM to cope with the changing behavior of consumer preference and to incline the business as per consumer requirement. To minimize the uncertainties and demand variation, this paper determines elements and dimension of QR by identifying the essential virtues of supply chain. This chapter is also devoted to recommend the driver and tools to merge QR with demand driven apparel SCM. This work extends previous research on the importance of QR strategy in SCM and fills a gap in traditional framework of demand driven supply chain. It illustrates how this strategy empowers by its components and split up into different dimensions, virtues and elements that allow more customer-oriented SCM. © 2013 Springer-Verlag.
Khan M.A.,Southeast University of Bangladesh
2012 7th International Conference on Electrical and Computer Engineering, ICECE 2012 | Year: 2012
This paper addresses the performance evaluation of Time-Hopping (TH), Direct-Sequence (DS) and sleeping protocol in LDR-UWB (Low data rate-ultra-wideband) network in the view of energy consumption of node. The energy lifetime is one of the most challenging issues of low data rate UWB network. Ultra-wideband (UWB) radio systems operate using extremely short duration signalling pulses. Spread spectrum techniques for multiple access is commonly considered for such a systems. First, we describe about the energy consumption model based on TH-SS and DS-SS techniques. Secondly, we show the energy consumption analysis with the simulation results. © 2012 IEEE.