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quantum gases power law potential grand potential condensation hierarchy

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Communications in Theoretical Physics 2016年第2期65卷 169-176页

作者： Mir Mehedi Faruk Md.sazzad hossain Md.Muktadir Rahman Department of Theoretical Physics University of Dhaka Dhaka-lO00 Bangladesh Theoretical Physics Blackett Laboratory Imperial College London SW7 2AZ United Kingdom Department of Nuclear Engineering University of Dhaka Dhaka-1000 Bangladesh

The changes in characteristics of Bose condensation of ideal Bose gas due to an external generic power law potential U =∑~d_（i=1）ci｜xi/ai｜~（ni） are studied carefully. Detailed calculation of Kim et al.（J. Phys. Condens. Matter 11（1999） 10269） yielded the hierarchy of condensation transitions with changing fractional dimensionality. In this manuscript, some theorems regarding specific heat at constant volume CV are presented. Careful examination of these theorems reveal the existence of hidden hierarchy of the condensation transition in trapped systems as well.

关键词： Investigation of Bose Condensation in Ideal Bose Gas Trapped under Generic Power Law Potential in d Dimension

The closed form solutions of simplified MCH equation and third extended fifth order nonlinear equation

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Propulsion and Power Research 2019年第2期8卷 163-172页

作者： A.K.M.Kazi sazzad hossain M.Ali Akbar Md.Abul Kalam Azad Department of Mathematics Begum Rokeya UniversityRangpur 5400Bangladesh Department of Applied Mathematics University of RajshahiRajshahi 6200Bangladesh

The investigation of closed form solutions for nonlinear evolution equations(NLEEs)is being an attractive subject in the different branches of mathematical and physical *** this article,the enhanced(G'=G)-expansion method has been applied to find the closed form solutions for NLEEs,such as the simplified MCH equation and third extended fifth order nonlinear equations which are very important in mathematical *** closed form solutions with arbitrary parameters are successfully obtained by this method which are expressed in terms of hyperbolic and trigonometric *** is shown that the obtained solutions are more general and fresh and can be helpful to analyze the NLEES in mathematical physics and engineering problems.

关键词： The enhanced(G'/G)-expansion method Simplified MCH equation Third extended fifth order nonlinear equation Nonlinear evolution equation(NLEEs) Closed form wave solutions

Solar Energy Prospects in Bangladesh: Target and Current Status

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Energy and Power Engineering 2021年第8期13卷 322-332页

作者： sazzad hossain Mohammad Maksudur Rahman Department of Physics Jahangirnagar University Savar Dhaka Bangladesh

Owing to the favorable geographical location, Bangladesh captures a good amount of solar radiation per day. The proper utilization of this solar energy may reduce the country’s energy demand to a great extent. Bangladesh government has already made a master plan to utilize the abundant solar energy in different ways with a capacity development target of 600 MW by the end of 2021. Until 2018 a total capacity of 220 MW of solar power could be achieved by installing 6.9 million solar home systems (SHSs). On the other way, rooftop solar and solar mini-grid projects facilitated the capacity of 3.07 MW and 5 MW, respectively. A capacity of 32 MW could also be touched by solar irrigation projects with more than 1300 pumps for serving country’s rural people, and solar-diesel hybrid solution program (by installing 138 small power stations) has been supporting the telecom operators. Bangladesh power development board (BPDB), and Infrastructure Development Company Limited (IDCOL) have been promoting numerous research-development solar projects to many governments and private universities to build sustainable energy equipped country.

关键词： Solar Energy Electricity Bangladesh Government IDCOL BPDP

Bank Credit and Agricultural Output in Bangladesh: An Econometric Analysis

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Macro Management & Public Policies 2022年第4期4卷 16-22页

作者： Shahidul Islam sazzad hossain Patwary Department of Banking and Insurance University of DhakaDhaka1000Bangladesh 2 Department of Finance and Banking Begum Rokeya UniversityRangpur5400Bangladesh

In this study,the authors tried to identify the relationship between bank credit and agricultural output in *** impact assessment of bank credit on agricultural output is also *** econometric techniques are used to determine the nature of the relationship between bank credit and agricultural output and the impact of bank credit.A total of 40 years(1981-2020)of annual time series data were collected from the Annual Reports of the Bangladesh Bank and World Bank’s world development *** and cointegration tests were performed initially and then analyzed with Vector Error Correction Model,confirming a long-run relationship between bank credit and agricultural ***,univariate and multivariate OLS models are performed to identify the magnitude of bank credit’s impact on agricultural *** models revealed that bank credit positively and significantly affects agricultural production in *** on these findings,the authors recommend additional fund allocation to the agricultural production system by the banks in Bangladesh.

关键词： Bank credit Agricultural output Bangladesh

Lived Experience of Thalassaemic Children in Bangladesh

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Open Journal of Nursing 2020年第11期10卷 1109-1125页

作者： Khaleda Akter Shanzida Khatun Md. sazzad hossain Dhaka Nursing College Dhaka Bangladesh Faculty of Child Health Nursing NIANER Dhaka Bangladesh

Background: Worldwide thalassemia poses a serious public health problem due to the high prevalence. Globally, 15 million people are suffering from clinically thalassemic disorders. Objective: To describe the lived experience of thalassaemic children in Bangladesh. Methods: This study was conducted following a descriptive qualitative research approach. Twenty thalassemic children were recruited purposively in the present study. Semi-structured individual’s interview guidelines were used to collect in depth information. In addition, digital recorder was used to capture the children’s voice. Data were analyzed using the process of content analysis. This study was approved by the Institutional Review Board (IRB), NIANER. Results: The mean age of the thalassemic children was (16.05) SD = 1.877. Most of the children were Muslim (95.0%) and they study at school (70.0%). Most of their mothers were (90.0%) housewife. This study revealed four major themes and eleven subthemes based on the experience of thalassemic children: 1) understanding of children meaning of thalassaemia: perception of children, unable to perform daily activities, and educational impact, 2) feeling frustrating experience and disease management: feelings about long term treatment, coping and altered body image, 3) family relationship: differences from siblings, parental attention and feeling burden, and 4) social interactions: sharing with peer, inability to social interaction. Conclusion: This study indicated that thalassaemia has affected negatively on several areas of health of these children including physical, emotional, social financial and educational areas. Reducing these problems requires comprehensive constant support and surveying health and medical status of these children to promote care and decrease the suffering of thalassaemic children. The findings of the present study are grounds for further research in

关键词： Lived Experience Thalassaemia Children

GIS-Based Analysis to Identify the Distribution and Accessibility of Urban Green Space in Dhaka Metropolitan City, Bangladesh

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Journal of Geographic Information System 2023年第1期15卷 35-52页

作者： Mohammad Wahidur Khan Md. sazzad hossain Mahbubul Alam Chair of Ecosystem Services Technische Universität Dresden Dresden Germany Chair of Tropical Forestry Technische Universität Dresden Dresden Germany

Urban Green Space (UGS) plays an important role in minimizing the negative effects of urbanization on city dwellers, which is predominantly factored into the accessibility to UGS. This study elucidated the distribution and accessibility of UGS in Dhaka, Bangladesh considering the paucity of such important scientific studies in the given area. The methodological structure of this study employed a multispectral Landsat satellite image from 2020 for identifying the logically defined UGSs, as well as a minimum proxy distance being the parameter to estimate accessibility to the UGS through a primary survey scheme and literature review. Considering UGS as a public area, we adopted a hybrid (combination of supervised and unsupervised classification) method followed by post-classification for UGS distribution assessment. The unsupervised classification identified the overall distribution of green spaces, whereas the anomalies of generated classes were rectified during the post-classification. Following the study findings, UGS in Dhaka metropolitan city accounts for only 602 ha or 1.9% of the total geographical space, with Ramna thana ranked as the highest contributor of 111 ha. However, in terms of accessibility to the UGS by city residents, 19.9% of the buildings in Dhaka metropolitan city were computed to be within the determined proxy distance of 500 m around the UGS. Also, parallel to UGS distribution, green space in Ramna thana (111 ha) exhibited the highest accessibility rate (64%) to the UGS compared with other thanas in Dhaka metropolitan city. The baseline findings will contribute to the long-term sustainable urban planning and development of more accessible green spaces in the study area.

关键词： Urbanization Urban Green Space Accessibility Proxy Distance

Study on the Physical and Mechanical Properties of Al-Powder Reinforced Bioactive Glass: Ceramic Composite Material

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Advances in Materials Physics and Chemistry 2022年第2期12卷 19-32页

作者： Muhammad Hafizur Rahman Khan sazzad hossain Mohammad Maksudur Rahman Department of Physics International University of Business Agriculture and Technology Dhaka Bangladesh Department of Physics Jahangirnagar University Savar Dhaka Bangladesh

Glass-ceramic samples, having composition of SiO2-35, CaO-45, Na2O-10 and P2O5-10 in weight ratio were prepared through sintering route. Glass powder was reinforced by Al powder. The strength of glass-ceramic composite was found to be temperature dependent, and it varies with the addition of Al powder. Flexural strength increases with the increase of powder addition and sintering temperature, however, decreases with the increase of sintering time. There is an optimum temperature (>1100℃) above which flexural strength of all samples decreases. Bulk density changes to a higher value as the addition of Al-powder increases up to 3% by weight above which density decreases slowly. On the other hand, apparent porosity and water absorption decrease with the increase of percentage of Al powder added. Porosity and water absorption also showed a dependent characteristic on sintering time and sintering temperature.

关键词： Biomaterials Glass Ceramics Aluminum Powder Composite Material

Mothers Experience about Complementary Feeding Practice in Bangladesh

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Open Journal of Pediatrics 2020年第3期10卷 423-437页

作者： Kuntala Gain Shanzida Khatun Md. sazzad hossain Dipali Rani Mallick Shaheed Tajuddin Ahmad Nursing College Gazipur Dhaka Bangladesh National Institute of Advanced Nursing Education and Research (NIANER) Dhaka Bangladesh

Background: Complementary feeding is a significant milestone that has nutritional, developmental, and health implications. Worldwide, 33% of the deaths are linked to malnutrition. Objective: To describe the mothers’ experience about complementary feeding practice with child aged less than two years in Bangladesh. Method: A descriptive qualitative study was conducted from July 2018 to June 2019. This study was approved by the Institutional Review Board (IRB) NIANER. 20 mothers of children of 6 - 24 months of age were recruited purposively who live in Sattalla slum. Descriptive statistics were used to analyze the mothers’ demographic characteristics and thematic analysis was used to describe mothers’ experience about complementary feeding practice. Results: The study showed that the average age of the mothers was 25 (SD = 4.75) years. Only 5% of the mothers have higher education. Through the findings, two main themes have been identified. Moreover, first main theme includes three subthemes. Fifty percent of the mothers stated that appropriate time to start complementary food for their babies is from 6 months of age. Mothers feed various types of complementary foods. Most of the mothers have knowledge about complementary feeding but they do not practice appropriately. Almost all of the mothers (95%) stated that their babies do not like to eat anything, and 45% of mothers feed only breast milk. Conclusion: Findings of the study will provide information for the nurses resulted in increasing the rate of complementary feeding practice am

关键词： Experience Complementary Feeding Practice Mothers Children

Determine the Factors of Female Early Age at First Cohabitation: A Case Study of Bangladesh

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Open Journal of Statistics 2015年第6期5卷 494-501页

作者： Md. Yasin Ali Parh Sharmin Aktar Sumy Md. sazzad hossain Department of Statistics Islamic University Kushtia Banglades

The main objective of the current study is to examine the existing situation of female early age at first cohabitation in Bangladesh as well as to identify the factors associated behind this issue. An analysis has been performed by using the secondary data of Bangladesh Demographic and Health Survey (BDHS), 2011. Chi-square test for dependency checking has been performed as bivariate analysis. After performing bivariate analysis, binary logistic regression analysis has been performed. To identify the significant variable, stepwise regression method has also been performed. The result of the study has revealed that women education, household economic status, area of residence, religion and geographical location have significant contribution for adolescent cohabitation. From this study it can be concluded that females who has low education and low socio-economic status are more likely to enter into cohabitation at early adulthood.

关键词： Female Early Age at First Cohabitation Bivariate Analysis Logistic Regression Analysis Odds Ratio Step Wise Regression