bluuebunny/crossref_metadata_2025_split huggingface dataset:
Influences of Proximate Determinates on Fertility Among Urban and Rural Women in Bangladesh
Authors: Hasan Muhammad Mahmudul , Islam Mirajul , Sakib Md Saifullah , Haq Md Iqramul 
Published: July 2021

Bangladesh has met a lot of challenges in recent decades. The remarkable decline in fertility is one of the major challenges faced by this country. The rate of fertility in rural areas is still higher than urban areas. The proximate determinants of fertility which influence fertility directly are analyzed in this study for urban and rural areas separately as well as the study quantify the decomposition of the differences in total fertility rate (TFR) in residence during 1993-94 to 2014. The effectiveness of contraceptive use is found to be the most important factor for declining fertility. The result revealed that the index of contraception shows a declining trend, indicating an increasingly inhibiting effect on fertility in both urban and rural areas of Bangladesh. The inhibition effect of postpartum infecundability decreases with increase in urbanization. The decomposition analysis shows that fertility decline has been occurred due to delay marriage, increase of contraception practice, shortening of postpartum infecundability period, increase proportion in induced abortion and the interaction factor.
Dhaka Univ. J. Sci. 66(1): 49-54, 2018 (January)
Advising an Appropriate Forecasting Method for a Snacks Item (Biscuit) Manufacture Company in Bangladesh
Authors: Barman Nandita , Hasan M Babul , Dhali Md Nayan 
Published: July 2021

In this paper, we study the most appropriate short-term forecasting methods for the newly launched biscuit factory produces different types of biscuits. One of them is nut-orange twisted biscuits. As it is a newly launched biscuit factory, it does not use any scientific method to find future demand of their products to produce for the purpose of sales. Having an error free production as well as a good inventory management we try to find an appropriate forecasting method for the sets of data we analyzed for that specific production. Several forecasting methods of time series forecasting such as the Moving Averages, Linear Regression with Time, Exponential Smoothing, Holt‘s Method, Holt-Winter‘s Method etc. can be applied to estimate the demand and supply for these companies. This paper focuses on selecting an appropriate forecasting technique for the newly launched biscuit company. For this, we analyze Exponential Smoothing method as used to time series. We observe from the empirical results of the analysis that if the data has no trend as well as seasonality, Exponential Smoothing Forecasting Method processes as the most appropriate forecasting method for the factory. If the data experiences linear trend in it then Holt’s Forecasting Method processes as the most appropriate forecasting method for the sets of data we analyzed.
Dhaka Univ. J. Sci. 66(1): 55-58, 2018 (January)
A DFT Investigation of Tris-(4´-(Amino)(1,1´-biphenyl)-3,4-diol) Fe(III) Complex
Authors: Matin Mohammad A , Aziz Mohammed A , Islam M Saiful 
Published: July 2021

Phenolic compounds, known as the pyrocatechol act as a metal chelating agent. Molecular details of cross-linking of pyrocatechol by transition metal ions are largely unknown. In the present study, the molecular properties of the tris-(4´-(amino)(1,1´-biphenyl)-3,4-diol)- Fe(III) complex have been investigated using density functional theory (DFT) at 6-311G(d,p). Calculated molecular properties of the optimized structure, the binding energies and spectroscopic properties are compared with the available experimental results. For the tris-complex investigated, the binding of Fe (III) with the catechol derivative is not as strong as the binding of other metal ions with catechol. The IR stretching bands show that the strong IR intensities is due to large charge polarization. Calculated electronic band gap is 2.45 eV which is in the range of transition metal ion-tris-(4´-(amino)(1,1´-biphenyl)-3,4-diol) complexes. The metal-ligand binding energy is 513.54 kcal mol-1, which could be used in understanding the speciation of Fe(III)-catechol complex. Structural parameters obtained from the DFT calculations are in good agreement with the crystallographic data.
Dhaka Univ. J. Sci. 66(1): 67-71, 2018 (January)
Structure Analysis of Tropical Cyclone Hudhud Over Bay of Bengal Using WRF Model
Authors: Imran Ashik , Syed Ishtiaque M , Hassan SM Quamrul , Rahman Kh Hafizur 
Published: July 2021

Tropical cyclones (TCs) over Bay of Bengal (BoB) have significant socio-economic impacts on the countries bordering the BoB. In this study, we have examined the structure and thermodynamic features of the TC Hudhud (7th -14th October, 2014) using WRF model. Simulated outputs are in good agreement with the available observations of India Meteorological Department and Joint Typhoon warning Center. At maximum intensity stage, the system’s horizontal size is found around 690 km. Wind and vorticity distributions capture the circulation of the system very well. Most strong winds of 60 ms−1 are extended vertically from 850 hPa to about 700 hPa. Simulation has shown intensification of the system above 200 hPa with wind speed of about 30ms−1. Relative humidity of the order of 90 % is found up to 400 hPa.
Dhaka Univ. J. Sci. 66(1): 79-86, 2018 (January)
Commercial Shrimp Farming at Coastal Areas in Bangladesh and Its Effects on Livelihood and Environment: A Study on Paikgacha Upazila, Khulna
Authors: Md Mohiuddin - , Nowreen Samshad , Uchinlayen - 
Published: July 2021

The study focuses on the changing livelihood pattern and the environment through shrimp farming in Bangladesh where the country is one of the largest producers of shrimp in the whole world. Shrimp production sector is contributing to the national economy of Bangladesh very fast other than any other sectors. This sector is the second top production sector of the century. This study was based on survey method; especially survey was done by questionnaire survey, where the primary data were collected from questionnaire survey. Although the environmental impact of shrimp cultivation is very adverse, the sector is becoming more popular because of huge profit. Therefore, the study found the change in pattern along with occupation, land use practice, sources of food, specially protein intake, transportation etc. Furthermore, the study found the adverse impact of intruding brackish water on surrounding environment and both on flora and fauna.
Dhaka Univ. J. Sci. 66(2): 87-90, 2018 (July)
Comparison Between ARIMA and VAR Model Regarding the Forecasting of the Price of Jute Goods in Bangladesh
Authors: Parvin Shahanaj , Khanam Murshida 
Published: July 2021

In this study we used Autoregrressive Intigrated Moving Average (ARIMA) and Vector Autoregrressive (VAR) model to analyze and forecast the price of total Jute Goods with four of its types, where data has been collected from Bangladesh Jute Mills Corporation (BJMC) from the year 1980-81 to 2013-2014. In this study, a comparison has been made regarding ARIMA model and VAR model to investigate which model is the best to forecast. The methodology employed in this study is the co-integration and Granger Causality under VECM. The Augmented Dickey Fuller (ADF) Test has been performed to test the stationarity of the data set. The findings of this study suggested that in forecasting the price of jute goods of Bangladesh, the ARIMA model is more efficient than VAR model.
Dhaka Univ. J. Sci. 66(2): 91-94, 2018 (July)
A Case Study of Double Lid Driven Cavity for Low Reynolds Number Flow
Authors: Pal Doli Rani , Saha Goutam , Saha Kajal Chandra 
Published: July 2021

The present numerical study has been accomplished remembering the true objective to explore the low Reynolds number flow with heat exchange behaviors inside a double lid driven square shaped cavity loaded with fluids such as air and water. Specifically, this work explores laminar, steady, incompressible mixed convection flow inside the cavity which has been done numerically by applying Finite Difference Method (FDM). In this analysis, top wall is treated as the heated wall and remaining walls are considered as cold walls. In addition, vertical side walls are moving at a relentless speed in its own particular plane along with the positive direction. Moreover, the numerical simulation is being conveyed out to observe the behavior of flow and thermal fields for variation of low Reynolds Number (Re), Richardson number (Ri) and Prandtl number(Pr). Also, the results have been validated through a comparison with other research works and a good agreement is observed. Also, results show that the above mentioned dimensionless parameters have significant effects on the flow and heat exchange attributes. Moreover, the effects of these parameters on average Nusselt number (Nu) have been analyzed and presented.
Dhaka Univ. J. Sci. 66(2): 95-101, 2018 (July)
Comparative Performance Study of Perovskite Solar Cell for Different Electron Transport Materials
Authors: Sultana Najmin Ara , Islam Md Obidul , Hossain Mainul , Mahmood Zahid Hasan 
Published: July 2021

In recent times, planar organo-metal halide perovskite solar cells (PSCs) achieved high power conversion efficiency (PCE > 22%). Mixed organic-inorganic halide perovskites, with excellent light harvesting properties, have evolved as a promising class of semiconductors for photovoltaics. In this work, compositional and electrical characterizations of materials used for different layers of PSC have been studied. One dimensional solar cell simulator wx-AMPS is used for numerical simulation of such devices and all simulations are done under AM1.5 illuminations and 300K temperature. Investigating the influences of thickness of electron transport material (ETM), hole transporting material (HTM) and absorber on the photovoltaic performance of PSCs, it is observed that, increase in thickness of perovskite (MAPbI3) results in the increase in PCE of solar cells, whereas increase in thickness of ETM layer results in decrease in the efficiency of the devices. The ETM plays a vital role on the performance of PSC. In this paper, for the first time performances of PSC for three different ETMs (TiO2, ZnO or SnO2) are calculated and analyzed simultaneously with the simulator wx-AMPS. The photovoltaic performances have been explored and efficiencies of 27.6%, 27.5% and 28.02% are reported for perovskite solar cells with TiO2, ZnO and SnO2 as ETM respectively for a specific thickness. Finally, this simulation study concludes that ZnO and SnO2 may be effective alternatives of the commonly used material, TiO2 as they are economically more potential and give somewhat better photovoltaic performance.
Dhaka Univ. J. Sci. 66(2): 109-114, 2018 (July)
Performance Evaluation of Spectrum Sharing Methods in WiMAX/WiFi Integrated Networks
Authors: Chowdhury Mohammed Nowaz Rabbani , Mawa Jannatul , Aditya Subrata Kumar 
Published: July 2021

Next generation wireless communication system is influenced by different wireless technologies such as WiFi, WiMAX, Cellular and LTE which use their fixed allocated spectrum. However, lack of spectrum resources becomes an important problem for future wireless network. Hence, for efficient use of spectrum resources, spectrum sharing between the existing wireless technologies receives much attention. However, to share the spectrum more efficiently, an effective spectrum sharing method should be developed. Most of the spectrum sharing methods are based on an optimization algorithm that provides an optimal solution for spectrum sharing. In this paper, the performance of a spectrum sharing method based on Genetic Algorithm (GA) has been evaluated. The method was applied in a WiMAX/WiFi integrated network, where a WiFi system temporarily uses a spectrum band of WiMAX system. Also a Linear Programming (LP) model has been developed as an alternative for spectrum sharing in the same network and comparative analysis between these two methods reveals that both methods give better performance in terms of throughput (bits/sec), download response time (sec) and received traffic rate (bytes/sec). According to the simulation results, it has been found that Genetic Algorithm (GA) shows its effectiveness in spectrum sharing in WiMAX/WiFi integrated network by reaching the global maxima very fast.
Dhaka Univ. J. Sci. 66(2): 103-107, 2018 (July)
A Comparative Study for Adsorptive Removal of Remazol Red R and Remazol Black B from Aqueous Solution by ZnO
Authors: Mazumder AZM Mainul Islam , Bikash Chowdhury Raihan , Rahman Md Ataur , Hossain Md Mufazzal 
Published: July 2021

Adsorptive removal of remazol red R (RRR) and remazol black B (RBB) from aqueous solution has been investigated by using ZnO as an adsorbent. Time for adsorption equilibrium, kinetics of adsorption at different initial concentrations of dyes and adsorption isotherms at different temperatures have been studied. Adsorption capacity increased with increasing initial dye concentration. The pseudo first-order and pseudo second-order kinetics were used to describe kinetic data and the rate constants were evaluated. Experimental data fits better in the pseudo second-order kinetic model than in the pseudo first-order kinetic model for both the dyes. Langmuir and Freundlich isotherm models were applied to describe the adsorption of RRR and RBB onto ZnO powders. Langmuir isotherm model provided a better correlation for the experimental data in comparison to the Freundlich isotherm model. Adsorption of both RRR and RBB on ZnO are physical in nature and increases with decreasing temperature. The equilibrium adsorption capacity decreases from 3.43 mg/g at 200C to 2.36 mg/g at 400C for RRR whereas that in the case of RBB changes from 0.77 mg/g at 300C to 0.75 mg/g at 400C. Adsorption of RRR on ZnO was found to be three times higher than the adsorption of RBB at a particular temperature. A model for adsorption of both the dyes has been proposed.
Dhaka Univ. J. Sci. 66(2): 121-127, 2018 (July)
Socio-economic and Demographic Determinants of Women’s Household Decision Making Autonomy in Bangladesh: A Cross-sectional Study
Authors: Sen Kanchan Kumar , Islam Mirajul , Hasan Muhammad Mahmudul 
Published: July 2021

Women’s autonomy is an important element of the economic and reproductive health developments in a country. The aim of this study was to find out the potential factors associated with women’s decision-making autonomy in Bangladesh. To fulfill this purpose, the cross-sectional data obtained from the Bangladesh Demographic Health Survey (BDHS), 2014 was used. The generalized linear mixed model approach has been applied to calculate the adjusted effects of the covariates by taking into account the correlation among subjects within clusters. The study reveals that women with age at marriage ≥ 18 years, having family size ≤ 4, having at least one child, exposed to media, belonging to NGO, living in urban areas and working outside home have greater influence on autonomy in household decision making.
Dhaka Univ. J. Sci. 66(2): 115-120, 2018 (July)
Women’s Empowerment and Its Determinants in Bangladesh: Evidence from a National Survey
Authors: Sen Kanchan Kumar , Nilima Shahnaz 
Published: July 2021

The potential factors associated with women‟s empowerment in household decision making as well as attitudes toward wife beating were determined in the study. The Bangladesh Demographic Health Survey (BDHS), 2014 data were used to get the determinants of women‟s empowerment. To measure the women‟s empowerment, the principal component analysis was used in the study. The ordinal logistic regression model was applied to determine the potential factors for women‟s empowerment. Results were also compared with the results obtained from classical linear regression model. The study revealed that lower difference of spousal ages and lower number of daughters were more likely to increase women‟s empowerment. Similar to other studies, early marriage and living in rural area gave the women lower empowerment but education, 1-4 family members, having at least one child, exposed to media, belonging to NGO and working outside home had greater positive influence on women‟s empowerment.
Dhaka Univ. J. Sci. 66(2): 129-134, 2018 (July)
Spectrophotometric Analysis of Preservatives and Coloring Agents in Orange Soft Drink and Orange Juice Samples
Authors: Bhuyian Saiful Islam , Ahmed Tofael , Hasan M Kamrul , Mohammad Shoeb - , Nahar Nilufar 
Published: July 2021

A rapid and simple UV-Vis spectrophotometric method was used for the determination of the level of sodium benzoate and yellow 6 in 14 different batches of orange soft drink samples and 7 different batches of orange juice samples commercially available in local markets of Bangladesh. The standard samples of sodium benzoate and yellow 6 in water were used to make calibration curves and the correlation coefficient (r2) of the calibration curves were found to be 0.9993 and 0.9953 for sodium benzoate and yellow 6, respectively. The wavelength of absorption maxima was 225 nm for Sodium benzoate and 429 nm for yellow 6. All 14 analyzed soft drinks samples contained yellow 6 and sodium benzoate in the range of 2.90-162.51 mg/L and 94.06-387.66 mg/L, respectively. The highest amount of sodium benzoate and yellow 6 were found in the sample AMR (387.66 mg/L) and BRC (162.51 mg/L), respectively. Among the 7 orange juice samples yellow 6 were found in the range of 28.03-102.66 mg/L and the highest amount was in the sample OJ1 (102.66 mg/L). The reproducibility and repeatability of the method was very satisfactory with low value of RSD in a range of 0.05 to 4.17% and 0.05 to 4.07%, respectively.
Dhaka Univ. J. Sci. 66(2): 135-137, 2018 (July)
Theoretical Investigation of Non-Linear Optical (NLO) Properties and UV-Visible Spectra of N-(3, 5-dichlorobenzylidene)aniline and N-(3, 5- dichlorobenzylidene)4-nitroaniline
Authors: Islam Md Saiful , Mousume Nusrat , Hossain M Mufazzal , Aziz Mohammed A , Islam M Saiful 
Published: July 2021

The non-linear optical properties of two Schiff bases, N-(3,5-dichlorobenzylidene)aniline (A) and N-(3,5- dichlorobenzylidene)4-nitroaniline (B) have been studied by ab initio Hartree-Fock method using 6-311G (d,p) basis set. In this study, we report the dipole moment (μ), polarizability ( ) and hyperpolarizability (ß) of both compounds. The hyperpolarizability (ß) value of B is much greater than that of the compound A as it is expected because of the strong intramolecular charge-transfer interaction. The geometrical parameters of the optimized structure of both A and B are reported here and compared with the available experimental data of the relevant compounds. We also calculated the λmax values of compounds A and B. The UV-visible spectra show that both compounds are transparent in the visible region (> 400 nm), implying non-zero microscopic hyperpolarizability. All calculations have been performed using GAUSSIAN09 programme.
Dhaka Univ. J. Sci. 66(2): 139-143, 2018 (July)
Isolation and Characterization of Two Cucurbitane Type Triterpenoid Glycocide from 1-Butanol Soluble Part of Momordica charantia Fruit Pulp Juice
Authors: Hossain M Shakhawoat , Hasan M Kamrul , Shoeb M , Mamun MIR , Nahar N , M Mosihuzzaman - 
Published: July 2021

Momordica charantia is a member of the Cucurbitaceae family having diverse biological activities. Two cucurbitane type triterpene glycoside have been isolated from 1-butanol soluble part of clear juice of M. charantia fruit pulp through column chromatography and HPLC. The isolated compounds were characterized as compound MC1 (3β, 7-O-β-glucopyranosyl-25-methoxy cucurbita –5-en-19-al) and compound MC2 (5β, 19-epoxy- 3- O-glucopyranosyl-25 methoxy cucurbita-6, 23-dien) with the help of UV Spectroscopy, Thin Layer Chromatography, IR Spectroscopy, 1H, 13C and dept-135 NMR. The proposed structures of the compounds were further confirmed by comparing the 13C-NMR values of the compounds with previous reported data.
Dhaka Univ. J. Sci. 66(2): 145-149, 2018 (July)
Cu(II), Zn(II), Cd(II) and Hg(II) Complexes of Pantroprazole (PPZH): Synthesis and Characterization
Authors: Begum Salma , Yeasmin Humaira , Shaikh AA , Bakshi Pradip K 
Published: July 2021

Several metal complexes of pantoprazole, [Cu(PPZ)(H2O)Cl], [Zn(PPZ)2], [Cd(PPZ)2].1.5H2O and [Hg(PPZ)(H2O)Cl] have been synthesized and characterized. Elemental analysis, IR, UV-Visible spectral analysis, magnetic measurement, thermogravimetric analysis, differential scanning calorimetric and cyclic voltammetric techniques were used for their characterization. The lipophilic weak base pantoprazole (PPZ) act as a potential bidentate ligand forming coordination complexes with divalent metal ions through anionic imidazolyl N- and O atom of sulfinyl >S=O group. All complexes possess tetrahedral geometry.
Dhaka Univ. J. Sci. 66(2): 151-156, 2018 (July)
Electromagnetics in Terms of Differential Forms
Authors: Hena Hasna , Jahangir Jenita , Ali Md Showkat 
Published: July 2021

The calculus of differential forms has been applied to electromagnetic field theory in several papers and texts, some of which are cited in the references. Differential forms are underused in applied electromagnetic research. Differential forms represent unique visual appliance with graphical apprehension of electromagnetic fields. We study the calculus of differential forms and other fundamental principle of electromagnetic field theory. We hope to show in this paper that differential forms make Maxwell’s laws and some of their basic applications more intuitive and are a natural and powerful research tool in applied electromagnetics.
Dhaka Univ. J. Sci. 67(1): 1-4, 2019 (January)
Conjugate Effects of Thermal and Mass Diffusion on Natural Convection Flow from a Heated Sphere with Internal Heat Generation or Absorption
Authors: Masud Sadia , Roy Nepal Chandra 
Published: July 2021

We examine the conjugate effects of thermal and mass diffusion on the unsteady natural convection flow from a heated sphere. The mathematical model of the problem is made into a system of nonsimilar partial differential equations introducing appropriate transformations. We solve this system employing the implicit finite difference technique. Numerical solutions have been elucidated with the skin friction as well as heat and mass transfer for varying Prandtl number, Schmidt number, combined buoyancy parameter, and heat generation or absorption parameter.
Dhaka Univ. J. Sci. 67(1): 13-20, 2019 (January)
Numerical Solutions of Time Dependent Partial Differential Equations Using Weighted Residual Method With Piecewise Polynomials
Authors: Alam Muntasir , Islam Md Shafiqul 
Published: July 2021

We use Galerkin weighted residual (GWR) method to solve one dimensional heat and wave equations as initial and boundary value problems (IBVPs) numerically. Three special types of piecewise polynomials namely: Bernstein, Bernoulli and Legendre polynomials are used as basis functions to solve these IBVPs. A few examples are tested by the proposed method and then the results are compared with the solutions found in other existing methods. The numerical results obtained in this paper are in good agreement with the exact solutions.
Dhaka Univ. J. Sci. 67(1): 5-12, 2019 (January)