The Dhaka University Journal of Science最新文献

Impact of COVID-19 and Russia-Ukraine war on the inflation rate of South and Southeast Asia 新冠肺炎疫情和俄乌战争对南亚和东南亚通货膨胀率的影响

The Dhaka University Journal of Science Pub Date : 2023-10-18 DOI: 10.3329/dujs.v71i2.69126

Tareq Rahman, Md Israt Rayhan

引用次数: 0

Determination of Non-linear Refractive Index of Pure SnO2 and TiO2 Doped SnO2 Thin Films Using Z-scan Technique 用z扫描技术测定纯SnO2和TiO2掺杂SnO2薄膜的非线性折射率

The Dhaka University Journal of Science Pub Date : 2023-10-18 DOI: 10.3329/dujs.v71i2.69092

PD Gupta, Ishtiaque M Syed

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Preparation and Characterization of Carbon Doped ZnO and Its Effectiveness as Photocatalyst under Visible Light 碳掺杂ZnO的制备、表征及其可见光下光催化剂效能

The Dhaka University Journal of Science Pub Date : 2023-10-18 DOI: 10.3329/dujs.v71i2.69121

Mahbuba Zaman, Nasrin Akter, Md Ataur Rahman, Md Mufazzal Hossain

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Factors of Using Long Acting and Permanent Methods (LAPM) of Contraception: Bangladesh Perspective 使用长效和永久性避孕方法(LAPM)的因素:孟加拉国视角

The Dhaka University Journal of Science Pub Date : 2023-10-18 DOI: 10.3329/dujs.v71i2.69090

Bikash Pal, Abu Zar Md Shafiullah

{"title":"Factors of Using Long Acting and Permanent Methods (LAPM) of Contraception: Bangladesh Perspective","authors":"Bikash Pal, Abu Zar Md Shafiullah","doi":"10.3329/dujs.v71i2.69090","DOIUrl":"https://doi.org/10.3329/dujs.v71i2.69090","url":null,"abstract":"The Government of Bangladesh is very much aware of controlling excessive birth rate to maintain population problem. Though Bangladesh is owning self-sufficiency in many sectors, the increasing population is a great impediment for the development of the country. So, promoting different contraceptive methods is of much importance. This work aims at identifying the important determinants that affect the long-acting and permanent methods (LAPM) of contraception. Firstly, chi-square test of association is carried out for defining the correlates of LAPM of contraception using Bangladesh Demographic and Health Survey (BDHS), 2017-18 data. For estimating the effects of each controlled independent variables, data are further analyzed within a multivariate framework. To obtain consistent and efficient estimates of parameters of interest, multinomial logistic regression model is used in this work. The study finds several socio-economic and demographic variables having high impact on using LAPM. The study findings are properly discussed and recommendations are made accordingly for the policy makers. Dhaka Univ. J. Sci. 71(2): 87-94, 2023 (July)","PeriodicalId":22453,"journal":{"name":"The Dhaka University Journal of Science","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135885157","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preparation and Characterization of Aceclofenac Complexes of First Row Transition Metals Mn(II), Co((II), Ni(II), Cu(II), and Zn(II) 第一排过渡金属Mn(II)、Co(II)、Ni(II)、Cu(II)、Zn(II)配合物的制备与表征

The Dhaka University Journal of Science Pub Date : 2023-10-18 DOI: 10.3329/dujs.v71i2.69124

Md Tanjir Rahman, Saiful Islam, Md Ershad Halim, Shamim Ahmed, M Q Ehsan

引用次数: 0

Simulation of Track and Landfall Process of Severe Cyclonic Storm Mora over the Bay of Bengal using WRF-ARW Model 用WRF-ARW模式模拟孟加拉湾强气旋风暴莫拉的路径和登陆过程

The Dhaka University Journal of Science Pub Date : 2023-10-18 DOI: 10.3329/dujs.v71i2.69123

Most Fatema Amin Akhi, Md Saddam Hossain, Md Shakil Hossain, Muhammad Abul Kalam Mallik

{"title":"Simulation of Track and Landfall Process of Severe Cyclonic Storm Mora over the Bay of Bengal using WRF-ARW Model","authors":"Most Fatema Amin Akhi, Md Saddam Hossain, Md Shakil Hossain, Muhammad Abul Kalam Mallik","doi":"10.3329/dujs.v71i2.69123","DOIUrl":"https://doi.org/10.3329/dujs.v71i2.69123","url":null,"abstract":"The simulations of Severe Cyclonic Storm (SCS) Mora (28-31 May 2017) generated over the Bay of Bengal (BoB) are performed in this study to analyze its features, landfall, and track using the Weather Research and Forecasting (WRF) model. WRF-ARW model has been used on a 10 km Horizontal Resolution (HR) domain for 96, 72, 48, and 24-hour lead time simulations. The model's performance is assessed by examining Mean Sea Level Pressure (MSLP), vertical distribution of velocity components, wind flow pattern, relative vorticity, vertical wind shear, relative humidity, latent heat flux at the surface, and track pattern. The simulated results are compared carefully to the observations from the Bangladesh Meteorological Department (BMD) and the India Meteorological Department (IMD). The findings are reasonably consistent with the observations. The simulated track is also reasonable even up to 72 hours in advance. Finally, the study's results suggest that the WRF model can be used as an effective tool in predicting TCs over the BoB. Dhaka Univ. J. Sci. 71(2): 142-152, 2023 (July)","PeriodicalId":22453,"journal":{"name":"The Dhaka University Journal of Science","volume":"75 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135883338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Development of Cost-Effective Fuel Briquette with Poultry Manure 经济高效的禽畜粪便燃料型煤的开发

The Dhaka University Journal of Science Pub Date : 2023-10-18 DOI: 10.3329/dujs.v71i2.69091

S M Nasif Shams, A M Mahmudul Hasan, Shams Bin Bony Amin, Gour Chand Mazumder

{"title":"Development of Cost-Effective Fuel Briquette with Poultry Manure","authors":"S M Nasif Shams, A M Mahmudul Hasan, Shams Bin Bony Amin, Gour Chand Mazumder","doi":"10.3329/dujs.v71i2.69091","DOIUrl":"https://doi.org/10.3329/dujs.v71i2.69091","url":null,"abstract":"Biomass can be converted into either heat energy or electrical or energy carriers using both thermo-chemical and bio-chemical conversion. Briquetting is a process where untreated biomass is converted into homogeneous, uniformly sized high density solid blocks. Briquettes are used in boilers, heating plants, thermal power stations and by individual households for heating. Present study focuses on using poultry manure with rice husk and saw dust. Poultry manure mixed with rice husk or saw dust by 60:40 ratio provides comparatively higher bond strength. Calorific value varies significantly with the use of poultry manure and tree leaves as well as its production cost. Pure rice husk contains higher calorific value (HCV) 12.6 MJ/Kg where adding poultry manure reduces its value to 10.3 MJ/Kg and Saw dust shows 10.4 MJ/Kg where pure saw dust has 16.3 MJ/Kg in 60:40 ratios with poultry manure. Addition of 20% tree leaves on weight basis ratio of 40:40:20 with base materials and poultry manure shows 10.5 MJ/Kg and 11.7 MJ/Kg respectively for rice husk and saw dust. Competitive price of briquette for 60:40 ratios with Poultry Manure shows 6 BDT/Kg and 5BDT/Kg when secondary material is added. Moreover, if the machine capacity increases the price is reduced. Dhaka Univ. J. Sci. 71(2): 95-103, 2023 (July)","PeriodicalId":22453,"journal":{"name":"The Dhaka University Journal of Science","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135884858","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preparation of Some as-Triazines, Their Evaluation as Spectrophotometric Reagents and Determination of Trace Amount of Iron in Certain Food and Natural Samples 一些as-三嗪类化合物的制备及其作为分光光度试剂的评价及某些食品和天然样品中痕量铁的测定

The Dhaka University Journal of Science Pub Date : 2023-10-18 DOI: 10.3329/dujs.v71i2.69093

Maksuda Parvin, Munira Mushtari, Afifa Rahman, Nazmin Akter, Md Anwarul Islam

引用次数: 0

Robust Multiple Linear Backward EliminationRegression 鲁棒多元线性后向消除回归

The Dhaka University Journal of Science Pub Date : 2023-10-18 DOI: 10.3329/dujs.v71i2.69122

Md Siddiqur Rahman, Sabina Sharmin

{"title":"Robust Multiple Linear Backward EliminationRegression","authors":"Md Siddiqur Rahman, Sabina Sharmin","doi":"10.3329/dujs.v71i2.69122","DOIUrl":"https://doi.org/10.3329/dujs.v71i2.69122","url":null,"abstract":"For building a linear prediction model, robust Backward Elimination (RBE) algorithm, which is computationally useful and scalable to high-dimensional large datasets, is introduced in this investigation. Backward Elimination (BE) can be stated in terms of sample correlations and simple RBE can be obtained by swapping out these correlations with their corresponding robust counterparts. The robust correlation for winsorized data was employed based on the adjusted winsorized correlation as a robust bivariate correlation. In another study, the Spearman rank correlation was employed as a robust bivariate correlation. However, the RBE has some drawbacks in the presence of multivariate outliers. In this article, the usage of FastMCD (Fast minimum covariance determinant)-based correlation is proposed in BE to reduce the influence of outlying data points. We call this proposed method BEmcd. A comprehensive simulation study was conducted to evaluate the performance of BEmcd with that of RBE based on winsorized correlation and Spearman rank correlation. Simulations and an application of actual data demonstrate the outstanding performance of BEmcd. Dhaka Univ. J. Sci. 71(2): 134-141, 2023 (July)","PeriodicalId":22453,"journal":{"name":"The Dhaka University Journal of Science","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135884247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Determinants of Caesarean Section in Bangladesh: A Multilevel Analysis of BDHS 2017-2018 Data 孟加拉国剖宫产的决定因素:BDHS 2017-2018数据的多层次分析

The Dhaka University Journal of Science Pub Date : 2023-10-18 DOI: 10.3329/dujs.v71i2.69094

M Ershadul Haque, Sabina Sharmin, Sayema Sharmin

{"title":"Determinants of Caesarean Section in Bangladesh: A Multilevel Analysis of BDHS 2017-2018 Data","authors":"M Ershadul Haque, Sabina Sharmin, Sayema Sharmin","doi":"10.3329/dujs.v71i2.69094","DOIUrl":"https://doi.org/10.3329/dujs.v71i2.69094","url":null,"abstract":"In recent years Caesarean Section (C-S)is considered as an important mode of child delivery in lowering mother and infant mortality. However, the unnecessary use of C-S has detrimental impacts on both mothers’ and newborns’ health. The purpose of this study is to evaluate the prevalence of caesarean delivery and to find out the related factors influencing the rapid rise in C-Sin Bangladesh by considering an appropriate statistical model in line with the data structure. The study is based on the data from the 2017-2018 BDHS which is a nationally representative survey. BDHS is conducted periodically and 2017-2018 is the latest of all the BDHS conducted so far. Information used in the present study was collected from 5230 mothers who provided complete information about all the variables considered in the study. Among the Bangladeshi women, the rate of Caesarean sections (C-S) was reported to be 32.94% which is high in any international standard. Multilevel analysis suggests that the highest education level, current working status, wealth index, media exposure, number of decisions in which women participated, age at birth, BMI, birth order of the index child, number of ANC visits during the period of pregnancy, and childbirth weight have significant influence on whether mothers deliver babies through the C-S. In order to prevent needless caesarean deliveries and safeguard mothers from the consequences, Bangladesh urgently needs caesarean delivery policy guidelines. The study will help the policymaker in taking such initiatives. Dhaka Univ. J. Sci. 71(2): 117-126, 2023 (July)","PeriodicalId":22453,"journal":{"name":"The Dhaka University Journal of Science","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135884239","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0