Aktar K.,Southeast University of Bangladesh |
Foyzun T.,Southeast University of Bangladesh
Evidence-based Complementary and Alternative Medicine | Year: 2017
Citrus macroptera (family Rutaceae), commonly known as Sat Kara, is a pharmacologically diverse medicinal plant. Various parts of this plant, specifically fruit, have an immense range of medicinal uses in folk medicine directed for a number of ailments. A plethora of active phytochemical constituents of this plant have been revealed so far, namely, limonene, beta-caryophyllene, beta-pinene, geranial edulinine, ribalinine, isoplatydesmine, and so forth. Several studies demonstrated the exploration of pharmacological potential of various parts such as fruits, leaves, and stems of C. macroptera as antioxidant, cytotoxic, antimicrobial, thrombolytic, hypoglycemic, anxiolytic, antidepressant, cardioprotective, and hepatoprotective. Furthermore, inhibition of in vitro α-amylase, inhibition of paracetamol induced hepatotoxicity, and potentiation of brain antioxidant enzyme are also ascertained. In present review, comprehensive study focused on knowledge regarding several phytopharmacological activities of Citrus macroptera has been described. © 2017 Koly Aktar and Tahira Foyzun.
Bhuyan M.H.,Southeast University of Bangladesh |
Deen Mohd Khosru Q.,Bangladesh University of Engineering and Technology
ECCE 2017 - International Conference on Electrical, Computer and Communication Engineering | Year: 2017
This work reports on developing an analytical pinch-off voltage model for the pocket implanted nano scale n-MOSFETs based on an asymmetric linear pocket profile at the source side under the gate of the device. Straight line approximated equation is used to simulate the pocket profile from the source towards the drain along the gate length at the surface of the MOS device. The effective doping concentration is derived for the whole gate length and is incorporated in the pinch-off voltage model that is obtained from the strong inversion charge expression at the surface. Then the pinch-off voltage is simulated for various drain and gate biases as well as for various device parameters. To observe the model validity, inversion charge profile, surface potential at various points along the channel, drain current vs. drain voltage curve is plotted for various gate biases by incorporating this effective channel doping concentration as well as the developed pinch-off voltage model. The simulation results show that the developed pinch-off voltage model can be used to study, simulate and characterize the pocket implanted ULSI devices. © 2017 IEEE.
Qiu B.,Southeast University of Bangladesh |
Yan Z.,Nanjing University
Pacific Economic Review | Year: 2017
This paper provides a two-country general equilibrium model under monopolistic competition, in which we incorporate heterogeneous fixed export costs, a non-zero export tax rebate rate and efficiency asymmetry to explain the existence of export-only firms. We focus on the impact of efficiency differences on social welfare and the evolution of export-only activities from autarky to trade. We show that exposure to trade brings a country of larger size and with higher efficiency more welfare gains, including higher industry productivity and greater variety of products. We also find that firms that face lower fixed export costs enjoy greater export tax rebates and firms that are located in more efficient countries have a greater chance of becoming export-only firms. Further internationalization promotes the prosperity of export-only activities. © 2017 John Wiley & Sons Australia, Ltd
Bhuyan M.H.,Southeast University of Bangladesh |
Khosru Q.D.M.,Bangladesh University of Engineering and Technology
ICECTE 2016 - 2nd International Conference on Electrical, Computer and Telecommunication Engineering | Year: 2017
This paper focuses on developing an analytical pinch-off voltage model for the pocket implanted nano scale n-MOSFETs based on symmetric linear pocket profiles both at the source and drain sides under the gate of the device. Straight line approximated equation is used to simulate the pocket profiles along the gate length at the surface of the MOS device. The effective doping concentration is derived for the whole gate length and is incorporated in the pinch-off voltage model that is obtained from the strong inversion charge expression at the surface. Then the pinch-off voltage is simulated for various drain and gate biases as well as for various device parameters. To observe the model validity, drain current vs. drain voltage curve is plotted for various gate biases by incorporating this pinch-off voltage model. The simulation results approve that the developed pinch-off voltage model can be used to study and characterize the pocket implanted advanced ULSI devices. © 2016 IEEE.
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.
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.
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.
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.