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- Volume 12, Issue1, 2010 (16 papers)
Monte Carlo simulation of Bose-Einstein condensation in a harmonic potential trap
Corresponding Author : Dr Md Enamul Hoque (mjonyh-phy@sust.edu)
Abstract : Bose-Einstein condensation has been attained using Monte Carlo simulation on non-interacting ideal bosons confined in a harmonic potential trap at near-zero temperature (~0K). A connection has been established between the cyclic paths originated by the interchange of identical bosons and condensation. At low temperatures, long cycles appear and condensation is obtained consequently. The simulated result is in perfect agreement with the corresponding theoretical findings.
Simulation of Waveform Generator
Corresponding Author : M. S. Islam (shafayet_rahat@student.sust.edu)
Abstract : Dirac's equation deals with the electromagnetic interactions in quantum mechanics. This equation can be modified for the classical modulated waveform. This paper presents a simulation approach for generating electromagnetic wave packets from the modified Dirac's electromagnetic equation solution. From this solution, an equivalent numerical circuit using SIMULINK is designed. This numerical circuit generates an exact amplitude modulated waveform of the solution. An analog circuit of the equation using op-amp is also designed with SIMULINK. The circuit generates an amplitude modulated…
Photoluminescence Quenching in blends with Poly(3-hexylthiophene) and Fullerene/Non-fullerene Acceptors
Corresponding Author : Nazia Chawdhury (nc-phy@sust.edu)
Abstract :
Photogenerated charge transfer behavior from a p-type poly(3-hexylthiophene) (P3HT) donor material to an n-type fullerene and non-fullerene acceptor materials have been studied in blend solution with the help of photoluminescence (PL) quenching. The PL spectra were studied using two different excitation sources. The small gap fullerene-ethyl nipecotate and phenyl-C61-butyric acid methyl ester (PCBM) are fullerene-based and poly naphthalene-bithiophene (N2200) is a non-fullerene-based n-type acceptor material used in this research work. Observation shows that the P3HT:N2200 blend with a weight ratio…
Biomass and Carbon Estimation of the Four Major Tree Species in Ratargul Swamp Forest, Bangladesh
Corresponding Author : A. Z. M. Manzoor Rashid (pollen_forest@yahoo.com)
Abstract : Wetland forests– a major ecosystem of Bangladesh, is still being neglected despite of having enormous potentials particularly in case of ecosystem balancing and CO2 accumulation. Under this purview, the present study aimed at estimating the biomass and carbon stock of four major tree species namely Pongamia pinnata, Barringtonia acutangula, Syzygium fruticosum and Lagerstroemia speciosa at Ratargul swamp forest under Sylhet Forest Division. Thirty sample plots (20 m × 20 m) were taken to enumerate biomass and carbon stock of the…
Are Diamond’s assembly rules applicable in tropical threatened vascular plants assemblages in the Tarap Hill Reserve in Bangladesh?
Corresponding Author : Mahmuda Sharmin (m.sharmin@westernsydney.edu.au)
Abstract : Disentangling the co-existing patterns (random or non-random) of species and to infer about assembly rules underpinning the observed patterns are central research issues in community ecology. Previous empirical results suggested that Diamond’s assembly rule explains a considerable amount of observed species spatial distribution pattern variation. However, the rule has yet to be checked in tropical forests where plant communities experience high anthropogenic disturbances and rapid conversion of natural forests has resulted in fragmented forests with many threatened species. In this…
A comparative study focusing on antioxidant properties of the selected green leafy vegetables: Chenopodium album, Brassica juncea and Brassica campestris
Corresponding Author : Razia Sultana Chowdhury (sult4n4c@gmail.com)
Abstract : Green leafy vegetables (GLVs) are believed to possess strong antioxidant potential. In this study, antioxidant properties of three GLVs were examined. Methanolic and ethanolic extracts of Chenopodium album, Brassica juncea and Brassica campestris were analyzed for total phenolic contents (TPC), total flavonoid contents (TFC), DPPH radical scavenging activity and Ferric reducing antioxidant power (FRAP). The results indicated that methanolic extract of B. campestris credited for the highest amount of TPC (226.48 µg GAE/mg) whereas the lowest amount was found in…
Determination of Groundwater Recharge Variation in Sylhet Sadar Upazila Using Water Table Fluctuation Method
Corresponding Author : Md. Shamim Ahmed (saiwm07@gmail.com)
Abstract : This study efforts to determine the variation of groundwater recharge and recharge rate with rainfall in Sylhet Sadar Upazila by water table fluctuation method. Rainfall and groundwater level data of the period 1990-2014 were collected and analyzed. The annual recharge varied from 56.35 mm to 225.19 mm with average of 110.31 mm. The annual groundwater recharge rate for the study period varied from only 1.68% to 5.13% with an average of 2.89% due to lower specific yield. In case of…
An interactive code for automatic (h- and p-versions) mesh generation and the solution of one-dimensional Bio-heat Equation
Corresponding Author : Md. Shajedul Karim (msk-mat@sust.edu)
Abstract : In this study, first, we develop an algorithm for the automatic mesh generation employing the nth order one-dimensional finite elements, preparing the elements data, and forming the element connectivity. Secondly, we modify the techniques for evaluating the integrals needed to compute the components of the element matrices and improve the assembly process to form the global matrices. Then, we develop an interactive computer code incorporating all the algorithms and techniques for obtaining the solution of the one-dimensional Bio-heat equation. The…
Documentation and Architectural Interpretation of the Panishail Temple Complex, Maulvibazar, Bangladesh
Corresponding Author : Kawshik Saha (kawshik-arc@sust.edu)
Abstract : This article represents survey data of historical and architectural documentation of Sri Radha Binod Ashrama locally known as the Panishail temple. Temple architecture is a common feature of traditional religious architecture practice in Bangladesh. This article is a historical and architectural investigation of a less known and mixed type of Hindu temple style in the Bengal region. The Panishail temple complex has a collection of structures that include tomb, temples, and residences aged between fifty to two hundred years. Over…
Small Area Estimation Method for District Level Prevalence of Maternal Health Care Indicators in Bangladesh
Corresponding Author : Mossamet Kamrun Nesa (mknesa-sta@sust.edu)
Abstract : Small area estimation (SAE) method is commonly used to obtain micro-level estimates of development indicators. The SAE method through Fay-Herriot model is well-known to compute small area level estimates. This study aims to apply Fay-Harriot model to estimate the district level maternal health care indicators (MHCI) viz., antenatal care (ANC), postnatal care (PNC), skilled birth attendance (SBA), and caesarean section (C-section) with their accuracy level. Both Bangladesh Demographic and Health Survey (BDHS) 2011 and Bangladesh Population and Housing Census (BPHC)…