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Search Results: 1 - 10 of 776657 matches for " A. F. M. Mainul Ahsan "
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Does January Effect Exist in Bangladesh?
A. F. M. Mainul Ahsan,Ahasan Habib Sarkar
International Journal of Business and Management , 2013, DOI: 10.5539/ijbm.v8n7p82
Abstract: This paper examines existence of January effect in Dhaka Stock Exchange (DSE) in Bangladesh. Regression model combined with dummy variables and monthly DSE All Share Price Index (DSI) from January 1987 to November 2012 has been used to test January effect in the stock return in DSE. It was empirically found that, although January anomaly doesn’t exist in DSE, there is significant positive return in June which raises question against efficient market hypothesis (EMH). Thus, there is an opportunity for investors to take advantage of this June anomaly.
Virus Free Potato Tuber Seed Production Through Meristem Culture In Tropical Asia
Ahsan Nagib,S.A. Hossain,M.F. Alam,M.M. Hossain
Asian Journal of Plant Sciences , 2003,
Abstract: In order to produce virus free potato tuber seeds in vitro culture was established using apical meristem of four widely cultivated varieties of Bangladesh namely Diamant, Cardinal, Multa and Lalpakri. Meristem of these varieties of potato were cultured for shoot proliferation and root induction in MS and MS0 medium supplemented with different types and concentration of phytohormones. Among the different growth regulator formulations, 0.5 mg l-1 GA3+0.04 mg l-1 KIN was found to be the best medium for the primary establishment of meristem. The primary established meristems were subcultured on to MSo medium and MS medium containing BA and IBA singly or in combinations. Considering all the treatments singly use of IBA (0.5 mg l-1 ) is recommended for proper shoot and root development from primary meristem. After DAS-ELISSA test the virus free in vitro grown potato plantlets were using for massive micro propagation. GA3 and KIN singly or in combinations are used for shoot and root multiplication, among all these combinations 2.0 mg l-1 GA3 was found to be the best media for shoot induction for the studied varities. For high frequency of root formation, combination of GA3 (0.1 mg l-1 )+KIN (0.1 mg l-1 ) was most effective. Rooted plantlet were gradually acclimatized and successfully established in the field. Visual evolution of the morphological trials of the tissue culture derived plants showed all plants were found normal and free from virus diseases. Substantial yield increase was observed in meristem derived plants over their source plants.
WiMAX or Wi-Fi: The Best Suited Candidate Technology for Building Wireless Access Infrastructure
A. F. M Sultanul Kabir,Md. Razib Hayat Khan,Abul Ahsan Md. Mahmudul Haque,Mohammad Saiful Islam Mamun
Computer Science , 2012,
Abstract: This paper presents a description of the existing wireless technology Wi-Fi and WiMAX, and try to compare Wi-Fi (IEEE 802.11) and WiMAX (IEEE 802.16), with respect to which technology provides a better solution to build a wireless access infrastructure. Each technology is evaluated based on some key characteristics. This paper concludes with a statement of, which technology will be the best and most cost effective solution to end user.
MUNICIPAL SOLID WASTE AND RECOVERY POTENTIAL: BANGLADESH PERSPECTIVE
M. Alamgir, A. Ahsan
Iranian Journal of Environmental Health Science & Engineering , 2007,
Abstract: A total of 7690 tons of municipal solid waste generated daily at the six major cities of Bangladesh, namely, Dhaka, Chittagong, Khulna, Rajshahi, Barisal and Sylhet, as estimated in 2005. Sampling was done at different waste generation sources such as residential, commercial, institutional and open areas, in different seasons. The composition of the entire waste stream was about 74.4% organic matter, 9.1% paper, 3.5% plastic, 1.9% textile and wood, 0.8% leather and rubber, 1.5% metal, 0.8% glass and 8% other waste. The per capita generation of municipal solid waste was ranged from 0.325 to 0.485 kg/cap/day while the average rate was 0.387 kg/cap/day as measured in the six major cities. The potential for waste recovery and reduction based on the waste characteristics are evaluated and it is predicted that 21.64 million US$/yr can be earned from recycling and composting of municipal solid waste.
Role of NGO`s Micro-credit Programme in Poverty Reduction in Bangladesh: A Study on Some Selected NGOs
A.H.M. Kamrul Ahsan
Pakistan Journal of Social Sciences , 2012,
Abstract: The present study intends to access the impact of the micro-credit program of NGOs to reduce poverty in Bangladesh. For this study, three NGOs i.e., BRAC, ASA and Grameen Bank have been selected. The study was basically conducted based on qualitative case study method. From the findings, it has been found that micro-credit program of various NGOs are playing significant role in reducing poverty in the study area. It has also been found that as a powerful tool of poverty reduction program of NGOs, micro-credit helps the creditors to reduce poverty more efficiently. On the other hand, creditors have been able to engage with income generating activities after receiving credit from NGOs.
Role of NGO`s Health, Family Planning and Education Program in Poverty Reduction in Bangladesh: A Study on BRAC
A.H.M. Kamrul Ahsan
Pakistan Journal of Social Sciences , 2012,
Abstract: The present study intends to access the impact of health, family planning and education program of NGOs to reduce poverty in terms of upliftment of standard of living of general public in Bangladesh. The study was basically conducted based on qualitative case study method. From the findings, it has been found that health, family planning and education program of BRAC is playing a significant role in this regard. It has also been found that being their involved with the health, family planning and education program of BRAC, the members have been able to improve their standard of living and also been able to make their children educated so that they may lead a poverty free life.
Role of NGOs and CBOs in Waste Management
A Ahsan,M Alamgir,NN Nik Daud
Iranian Journal of Public Health , 2012,
Abstract: Background: Developing cities like Khulna, the third largest metropolitan city in Bangladesh, have now begun to confess the environmental and public health risks associated with uncontrolled dumping of solid wastes mainly due to the active participation of non-governmental organizations (NGOs) and community-based organizations (CBOs) in municipal solid waste (MSW) management.Methods: A survey was conducted to observe the present scenarios of secondary disposal site (SDS), ultimate disposal site (UDS), composting plants, medical wastes management and NGOs and CBOs MSW management activities.Results: A total of 22 NGOs and CBOs are involved in MSW management in 31 wards of Khulna City Corporation. About 9 to 12% of total generated wastes are collected by door-to-door collection system provided by mainly NGOs and CBOs using 71 non-motorized rickshaw vans. A major portion of collected wastes is disposed to the nearest SDS by these organizations and then transferred to UDS or to private low-lying lands from there by the city authority. A small portion of organic wastes is going to the composting plants of NGOs.Conclusion: The participation of NGOs and CBOs has improved the overall MSW management system, especially waste collection process from sources and able to motivate the residents to store the waste properly and to keep clean the premises.
Rotating Bose gas with hard-core repulsion in a quasi-2D harmonic trap: vortices in BEC
M. A. H. Ahsan,N. Kumar
Physics , 2000, DOI: 10.1103/PhysRevA.64.013608
Abstract: We consider a gas of N(=6, 10, 15) Bose particles with hard-core repulsion, contained in a quasi-2D harmonic trap and subjected to an overall angular velocity $\Omega$ about the z-axis. Exact diagonalization of the $n\times n$ many-body Hamiltonian matrix in given subspaces of the total (quantized) angular momentum L$_{z}$, with $n\sim 10^{5}$(e.g. for L$_{z}$=N=15, n =240782) was carried out using Davidson's algorithm. The many-body variational ground state wavefunction, as also the corresponding energy and the reduced one-particle density-matrix were calculated. With the usual identification of $\Omega$ as the Lagrange multiplier associated with L$_{z}$ for a rotating system, the $L_{z}-\Omega$ phase diagram (or the stability line) was determined that gave a number of critical angular velocities $\Omega_{{\bf c}i}, i=1,2,3,... ,$ at which the ground state angular momentum and the associated condensate fraction undergo abrupt jumps. A number of (total) angular momentum states were found to be stable at successively higher critical angular velocities $\Omega_{{\bf c}i}, \ i=1,2,3,...$ for a given N. For $L_{z}>N$, the condensate was strongly depleted. The critical $\Omega_{{\bf c}i}$ values, however, decreased with increasing interaction strength as well as the particle number, and were systematically greater than the non-variational Yrast-state values for the single vortex state with L$_{z}$ =N. We have also observed that the condensate fraction for the single vortex state (as also for the higher vortex states) did not change significantly even as the 2-body interaction strength was varied over several $(\sim 4)$ orders of magnitude in the moderately to the weakly interacting regime.
A Davidson-Lanczos iteration method for computation of continued-fraction expansion of the Green's function at very low temperatures: Applications to the dynamical mean field theory
Medha Sharma,M. A. H. Ahsan
Physics , 2014,
Abstract: We present a combination method based on orignal version of Davidson algorithm for extracting few of the lowest eigenvalues and eigenvectors of a sparse symmetric Hamiltonian matrix and the simplest version of Lanczos technique for obtaining a tridiagonal representation of the Hamiltonian to compute the continued fraction expansion of the Green's function at a very low temperature. We compare the Davidson$+$Lanczos method with the full diagonalization on a one-band Hubbard model on a Bethe lattice of infinite-coordination using dynamical mean field theory.
Exact Diagonalization Study of Bose-Condensed Gas with Finite-Range Gaussian Interaction
Mohd. Imran,M. A. H. Ahsan
Physics , 2015,
Abstract: We investigate a system of $N$ spinless bosons confined in quasi-two-dimensional harmonic trap with repulsive two-body finite-range Gaussian interaction potential of large $s$-wave scattering length. Exact diagonalization of the Hamiltonian matrix is carried out to obtain the $N$-body ground state as well as low-lying excited states, using Davidson algorithm in beyond lowest-Landau-level approximation. We examine the finite-range effects of the interaction potential on the many-body ground state energy as also the degree of condensation of the Bose-condensed gas. The results obtained indicate that the finite-range Gaussian interaction potential enhances the degree of condensation compared to the zero-range interaction potential. We further analyze the effect of finite-range interaction potential on the breathing mode collective excitation. Our theoretical results may be relevant for experiments currently conducted on quasi-two-dimensional Bose gas with more realistic interaction potential.
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