bluuebunny/crossref_metadata_2025_split huggingface dataset:
Demand for Institutional Delivery in Bangladesh: An Application of Household Production Function
Authors: Akanda Md Abdus Salam 
Published: April 2012

Maternal and child health issues continue to be at the forefront of national and global health policies. Notwithstanding the national and global policy initiatives, maternal mortality continues to be on the ascendancy in developing countries. This paper investigates the determinants of institutional delivery among a cross section of Bangladeshi women. For appropriate policy targeting, it is imperative to investigate the factors that promote institutional delivery and those that retard it. Using discrete choice model, and controlling for other covariates, we found that, women from the richest income quintile, and those that have access to health information via television delivered at appropriate health institutions. Besides, place of residence, mothers education, wanted pregnancy, utilization of antenatal care services and number of health workers visiting time inter alia were found to be significant predictors of the demand for institutional and supervised delivery. The policy implication of this finding is that health education via television is more effective than print media. Secondly, government policies meant to create jobs and increase income levels are envisaged as proper policy instrument to induce the utilization of appropriate health services including institutional delivery. Thirdly, information, education and communication (IEC) programs are urgently needed to inform women about the cause and potential risk of maternal health complications as well as the significance of institutional delivery. Finally, the use of health inputs such as antenatal care during pregnancy should be encouraged.DOI: http://dx.doi.org/10.3329/dujs.v60i1.10337 Dhaka Univ. J. Sci. 60(1): 53-59 2012 (January)
Linear Equation Method of Constructing Confounding Plan in <i>p<sup>n</sup></i> - Factorial Experiment
Authors: Jalil MA 
Published: April 2012

This article describes a linear equation method of designing simultaneous confounding of one or more factorial effects in pn - factorial experiment. It is demonstrated that it becomes easier to construct the design of simultaneous confounding of one or more factors in a pn - factorial experiment especially when the number of factors as well as the number of levels becomes larger. It is also discussed that such approach is very much convenient from the viewpoint of computation.DOI: http://dx.doi.org/10.3329/dujs.v60i1.10338Dhaka Univ. J. Sci. 60(1): 61-64 2012 (January)
A Mathematical Model for the Alkylation of Phenol with Octanol-1
Authors: Saha Manoranjan , Hossain Md Kabir , Ashaduzzaman Md , Saha Dipti , Islam Shams Tania Afroza , Chowdhury AM Sarwaruddin , Kamruzzaman Mohammad 
Published: April 2012

A 3-factor 2-level Yates pattern experimental design was used to develop a mathematical model for the alkylation of phenol with octanol-1 in the presence of sulphuric acid. A set of trials was planned with two replicates and the centre point trial with 4 replicates. Main effects as well as two- and three- factor interaction effects were statistically significant. The highest experimental yield was 79.5%. The experimental settings were temperature, 160ºC; molar ratio of phenol to octanol-1, 10:1; amount of 94% sulphuric acid, 8% by wt. of phenol; addition time, 2h and stirring time, 2h. Adequacy of the suggested model was checked. The difference between the experimental and estimated yield was negligible.DOI: http://dx.doi.org/10.3329/dujs.v60i1.10339 Dhaka Univ. J. Sci. 60(1): 65-70 2012 (January)
Alkylation of Ethylbenzene with Cyclohexylchloride: A Statistical Study
Authors: Saha Manoranjan , Chakravarty Prashanta , Saha Dipti , Alam Md Zahangir , Tareque Mahmud Hasan , Alam Md Ashraful , Rana Ashequl Alam 
Published: April 2012

A mathematical model was developed for the alkylation of ethylbenzene with cyclohexyl chloride in the presence of anhydrous aluminium chloride as a catalyst using the Yates Pattern experimental design. The variables chosen for the study were temperature, molar ratio of ethylbenzene to cyclohexyl choloride and amount of anhydrous aluminium chloride. The critical response was the yield of cyclohexylethylbenzene. Main effects as well as interaction effect of molar ratio of ethylbenzene to cyclohexyl chloride and amount of catalyst were statistically significant. The adequacy of the suggested model was checked.DOI: http://dx.doi.org/10.3329/dujs.v60i1.10340 Dhaka Univ. J. Sci. 60(1): 71-76 2012 (January)
Investigation on Orange Peel: Derivatization of Isolated Cellulosic Material and Analysis of the Fatty Acids Composition
Authors: Islam Md Rabiul , Muslim Tanvir , Rahman Md Azizur 
Published: April 2012

Isolation of cellulosic material from the waste material, orange (Citrus sinensis) peel has been carried out. The isolated cellulosic material has been converted into its acetate ester. The acetate derivative has been characterized by titrimetric method and IR spectra. The fatty acid composition of the orange peel has also analyzed by GLC. Successful conversion of agro-waste into its acetate derivative and the fatty acid composition suggest an alternative use of this waste material.DOI: http://dx.doi.org/10.3329/dujs.v60i1.10341 Dhaka Univ. J. Sci. 60(1): 77-78 2012 (January)
Application of a Mathematical Model by Means of Experimental Design to Alkylation of <i>o</i>-Cresol with Cyclohexene
Authors: Kamruzzaman Mohammad , Rana Ashequl Alam , Alam Md Zahangir , Saha Manoranjan 
Published: April 2012

Alkylation of o-cresol with cyclohexene in the presence of perchloric acid as catalyst was studied statistically with a three-factored experimental design. Factorial design was employed to study the effects of single factors and the effects of their interactions on the yield of alkylation. Reaction temperature, molar ratio of o-cresol to cyclohexene and amount of perchloric acid were considered as the major variables. A mathematical model was derived to calculate the predicted yield of alkylation of o-cresol with cyclohexene in the presence of perchloric acid under certain reaction conditions and cyclohexyl o-cresol was obtained in high yield. The adequacy of the suggested model was checked up and the discrepancies between the experimental and calculated values did not exceed 1.52%. An optimum yield (89.5%) of the product was obtained under the reaction conditions of a temperature of 140º C; a 6:1 molar ratio of ocresol to cyclohexene and a 5% by weight perchloric acid of o-cresol.DOI: http://dx.doi.org/10.3329/dujs.v60i1.10342 Dhaka Univ. J. Sci. 60(1): 79-85 2012 (January)
STM Spectroscopy of Star-Type Molecular Magnet
Authors: Alam MS , Chowdhury FA , Saalfrank RW , Postnikov AV , Müller P 
Published: April 2012

In order to achieve a better understanding of how scanning tunneling microscopy (STM) images of metallo-complexes are related to the geometric and electronic structure, we performed scanning microscopy (STM) and scanning tunneling spectroscopy (STS) techniques on [FeIIIFeIII 3L6] (L= N-methylaminediethanolate) star-type tetranuclear molecular magnet. The experiments were performed under ambient condition. We were able to image single molecule by STM with submolecular resolution. In our STS measurements we found a rather large signal at the positions of iron ion centers in the molecules. This direct addressing of metal centers was further confirmed by density functional theory (DFT) calculations.DOI: http://dx.doi.org/10.3329/dujs.v60i1.10343 Dhaka Univ. J. Sci. 60(1): 87-91 2012 (January)
Layout Design of a 2-bit Binary Parallel Ripple Carry Adder Using CMOS NAND Gates with Microwind
Authors: Ul Alam Arif , Majid Nishatul , Aditya SK 
Published: April 2012

A good deal of ingenuity can be exercised and a vast amount of time wasted exploring layout topologies to minimize the size of a gate or other circuitry such as an adder or memory element in an integrated circuit. This paper represents a simple and compact layout design for two bit binary parallel ripple carry adder using only CMOS NAND gates with the help of Microwind as a tool for design and simulation. Construction of this adder for fabricating involves the design of 2-input, 3-input, 4-input NAND gates and CMOS NAND inverters. The performance parameters are analyzed from the simulation responses and characteristics curves of the proposed design. The optimization of the design towards single P+ or N+ diffusion, single +Vdd and single Vdd supply contributed to lesser area and improved functionality of the adder circuits performance.DOI: http://dx.doi.org/10.3329/dujs.v60i1.10346 Dhaka Univ. J. Sci. 60(1): 103-108 2012 (January)
Globally Robust Confidence Intervals for Location
Authors: Haque M Ershadul , Khan Jafar A 
Published: April 2012

Classical inference considers sampling variability to be the only source of uncertainty, and does not address the issue of bias caused by contamination. Naive robust intervals replace the classical estimates by their robust counterparts without considering the possible bias of the robust point estimates. Consequently, the asymptotic coverage proportion of these intervals of any nominal level will invariably tend to zero for any proportion of contamination.In this study, we attempt to achieve reasonable coverage percentages by constructing globally robust confidence intervals that adjust for the bias of the robust point estimates. We improve these globally robust intervals by considering the direction of the bias of the robust estimates used. We compare the proposed intervals with the existing ones through an extensive simulation study. The proposed methods have reasonable coverage percentage while the existing method show very poor coverage as sample size increases.DOI: http://dx.doi.org/10.3329/dujs.v60i1.10347 Dhaka Univ. J. Sci. 60(1): 109-113 2012 (January)
Balancing of an Inverted Pendulum Using PD Controller
Authors: Hasan Mahadi , Saha Chanchal , Rahman Md Mostafizur , Sarker Md Rabiual Islam , Aditya Subrata K 
Published: April 2012

Balancing of an inverted pendulum robot by moving a cart along a horizontal track is a classical problem in the field of Control Theory and Engineering, for the beginners to understand its dynamics. Several physical models can also be simplified as elastic inverted pendulums like rockets and walking robots. Many researchers have been applying different control algorithm and design techniques such as PID Controller, State Space, Neural Network, Genetic Algorithm (GA) even Particle Swam Optimization (PSO), in both digital and analog domain using various sensors. However, this can also be done by using a single potentiometer as a sensor and Proportional Derivative Controller (PD) controller as the design algorithm. The comparison or difference between the reference and the potentiometer generates control signal to drive the system. In this case, it consists of a thin vertical rod attached at the bottom, referred to as pivot point mounted on a mobile toy car. The car, depending upon the direction of the deflection of the pendulum moves horizontally in order to bring the pendulum to absolute rest. The main idea behind this control process is the use of PD (Proportional and Derivative) controller to generate signal to control the speed and direction of the motor. The only sensor used in this project was a potentiometer (pot) which was attached with the pendulum rod. The variation in its resistance causes change in voltage and afterward, it was compared with the reference voltage to generate the appropriate control signal. PROTEUS software was used for circuit simulation, frequency responses of the system were analyzed in MATLAB with different values of KP and KD. Finally, to represent the system stability, root locus diagram was drawn using MATLAB.DOI: http://dx.doi.org/10.3329/dujs.v60i1.10348 Dhaka Univ. J. Sci. 60(1): 115-120 2012 (January)
A Convenient Synthesis of Substituted Spiro[5.5]Undecanes Using Lewis Acid Catalysts
Authors: Ahmed M Glasuddin , Romman UKR , Akhter Kawsari , Islam Monarul , Hossain Mohammad Mosharrag , Halim Md Ershad 
Published: April 2012

A one-pot synthesis of 3, 3-Dimethyl-7, 11-diphenyl-spiro [5, 5] undecane-1, 5, 9-triones 4a-c has been achieved by the application of Michael reaction between dimedone (5,5-dimethylcyclohexane-1,3-dione) 1 and trans,trans diarylideneacetones [1,5-diaryl-1,4- pentadien-3-ones] 2a-c (a. Ar = C6H5-, b. Ar = 2-Cl-C6H4-, c. Ar = 2- CH3O- C6H4) using Lewis acid catalysts.DOI: http://dx.doi.org/10.3329/dujs.v60i1.10349 Dhaka Univ. J. Sci. 60(1): 121-124 2012 (January)
Mechanical and Electrical Properties: Electrospun Alginate/Carbon Nanotube Composite Nanofiber
Authors: Islam Md Shahidul , Ashaduzzaman Md , Masum Shah Md , Yeum Jeong Huyn 
Published: April 2012

Nanofibers of the composite of alginate (Alg) and carbon nanotube (CNT) were prepared using electrospinning method out of aqueous solutions. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), mechanical measurement, and electrical conductivity were done to characterize the Alg/CNT composite nanofibers morphology and properties. The SEM and TEM images show the CNT to be well incorporated along the nanofibers. The study shows that the introduction of CNT results in improvement in tensile strength and electrical conductivity of the Alg matrix. The electrospinning of Alg/CNT composites could potentially supply useful options for the fabrication of biomaterial scaffolds.DOI: http://dx.doi.org/10.3329/dujs.v60i1.10350 Dhaka Univ. J. Sci. 60(1): 125-128 2012 (January)
Effect of Sodium Dodecyl Sulfate on Volumetric Properties of Methanol Ethanol n-Propanol and iso-Propanol at (298.15 - 323.15)K
Authors: Motin MA , Mia MA Hafiz , Reza KM Salim , Islam AKM Nasimul , Yousuf MA , Salam MA 
Published: April 2012

The critical micelle concentration (CMC) of Sodium dodecyl sulfate (SDS) in water was determined from the conductance and viscosity measurement. The estimated value of CMC was found to be 0.0085 mol.L-1 at 29°C. The concentration of SDS in pre-micellar and postmicellar region of 0.005M and 0.01M, respectively were used for the volumetric measurements of Methanol, Ethanol, n-Propanol and iso- Propanol with SDS solutions. Densities of ternary mixtures of Methanol, Ethanol, n-Propanol and iso-Propanol with 0.005M and 0.01M aqueous SDS have been studied over the entire range of composition at 298.15- 323.15K with an interval of 5K except Methanol. Methanol system was studied at 298.15-308.15K due to its low boiling point. The values of excess molar volumes, VE for all the systems are negative over the entire range of composition, showing minima at ~ 0.45 mole fraction of Methanol, ~ 0.4 mole fraction of Ethanol, ~ 0.25 mole fraction of n-Propanol and ~ 0.3 mole fraction of iso-Propanol. All the systems are showing minima at aqueous SDS rich region. The VE values for the n-Propanol + aqueous SDS and iso-Propanol + aqueous SDS mixtures are slightly sigmoid, being negative at lower mole fractions (x2) and positive at higher x2 of Propanols. The excess properties (VE) data have been fitted by the least square method to the four parameter Redlich-Kister equation and the values of the parameter aj have been reported.DOI: http://dx.doi.org/10.3329/dujs.v60i1.10351 Dhaka Univ. J. Sci. 60(1): 129-136 2012 (January)
Characterization of Electrodeposited Cadmium Selenide Thin Films
Authors: Chowdhury RI , Islam MS , Sabeth F , Mustafa G , Farhad SFU , Saha DK , Chowdhury FA , Hussain S , Islam ABMO 
Published: April 2012

Cadmium selenide (CdSe) thin films have been deposited on glass/conducting glass substrates using low-cost electrodeposition method. X-ray diffraction (XRD) technique has been used to identify the phases present in the deposited films and observed that the deposited films are mainly consisting of CdSe phases. The photoelectrochemical (PEC) cell measurements indicate that the CdSe films are n-type in electrical conduction, and optical absorption measurements show that the bandgap for as-deposited film is estimated to be 2.1 eV. Upon heat treatment at 723 K for 30 min in air the band gap of CdSe film is decreased to 1.8 eV. The surface morphology of the deposited films has been characterized using scanning electron microscopy (SEM) and observed that very homogeneous and uniform CdSe film is grown onto FTO/glass substrate. The aim of this work is to use n-type CdSe window materials in CdTe based solar cell structures. The results will be presented in this paper in the light of observed data.DOI: http://dx.doi.org/10.3329/dujs.v60i1.10352 Dhaka Univ. J. Sci. 60(1): 137-140 2012 (January)
Effects of Double Filtration Plasmapheresis, Leflunomide, and Methotrexate on Inflammatory Changes Found Through Magnetic Resonance Imaging in Early Rheumatoid Arthritis
Authors: YU XIAOXIA , WANG LIXIN , XU PING , LU WEIWEI , LAN GUOBIN , PING LIFENG , WANG XIAOLEI , TIAN JUNGE , LIU JUNLAN 
Published: April 2012

Objective.To evaluate the effects of double filtration plasmapheresis (DFPP) in combination with leflunomide and methotrexate (MTX) on magnetic resonance imaging (MRI)-detected inflammatory changes (synovitis and bone edema) in patients with early rheumatoid arthritis (RA) with high disease activity.Methods.Sixty RA patients with highly active disease of 6 months’ to 3 years’ duration were randomized to receive DFPP in combination with leflunomide and MTX (DFPP group), and leflunomide plus MTX (no-DFPP group). The primary endpoint was the improvement in MRI-detected synovitis from baseline over 6 months. Secondary endpoint variables included DAS28 remission and American College of Rheumatology (ACR) criteria responses for 6 consecutive months.Results.The study achieved significant improvement in synovitis and bone edema, with significantly lower synovitis and bone edema scores in the DFPP group compared with the no-DFPP group (p < 0.001). Synovitis scores in 48.39% of patients (15/31) in the DFPP group were 0 at Month 6. Bone edema scores in 32.26% of patients (10/31) in the DFPP group were 0 at Month 6. We observed significantly greater ACR20, ACR50, ACR70, and ACR90 responses and DAS28 remission rates in the DFPP group than in the no-DFPP group (p < 0.001). Sustained DAS28 remission and ACR90 response for at least 6 months were achieved in 100% of patients receiving DFPP therapy.Conclusion.The combination of DFPP and disease-modifying antirheumatic drugs (DMARD) was superior to DMARD alone for reducing MRI-detected signs of synovitis and bone edema in patients with early highly active RA. DFPP therapy enabled rapid and more complete suppression of inflammation in patients with highly active RA. Nearly half the patients (48.39%) who had received DFPP therapy achieved both clinical remission and imaging remission, a state characterized as true remission.
Effect of Golimumab on Patient-reported Outcomes in Rheumatoid Arthritis: Results from the GO-FORWARD Study
Authors: GENOVESE MARK C. , HAN CHENGLONG , KEYSTONE EDWARD C. , HSIA ELIZABETH C. , BUCHANAN JACQUELINE , GATHANY TIMOTHY , MURPHY FREDERICK T. , WU ZHONG , PARASURAMAN SHREEKANT , RAHMAN MAHBOOB U. 
Published: April 2012

Objective.To evaluate the effect of golimumab on physical function, general health, and fatigue in patients with active rheumatoid arthritis (RA) despite methotrexate (MTX) therapy.Methods.In the multicenter, randomized, placebo-controlled GO-FORWARD study, 444 adults with active RA despite MTX received subcutaneous placebo + MTX (crossover to golimumab 50 mg at Week 24), golimumab 100 mg + placebo, golimumab 50 mg + MTX, or golimumab 100 mg + MTX every 4 weeks. Physical function and general health were assessed using the Health Assessment Questionnaire-Disability Index (HAQ-DI) and Physical and Mental Component Summary (PCS, MCS) scores of the Medical Outcomes Study Short Form-36 questionnaire (SF-36), respectively, through Week 52. Fatigue was measured through Week 24 using the Functional Assessment of Chronic Illness Therapy-Fatigue (FACIT-Fatigue) questionnaire.Results.Mean improvements from baseline in HAQ-DI, SF-36 PCS, and FACIT-Fatigue scores (Weeks 14 and 24) were significantly greater for golimumab 50 mg + MTX and 100 mg + MTX versus placebo + MTX. Significantly greater proportions of patients treated with golimumab + MTX achieved clinically meaningful improvements from baseline to Weeks 14 and 24 in HAQ-DI, PCS, and FACIT-Fatigue scores. Mean improvements in SF-36 PCS (Week 14), MCS (Week 24), and FACIT-Fatigue (Weeks 14 and 24) scores were significantly greater for golimumab 100 mg + placebo versus placebo + MTX. Mean improvements from baseline in HAQ-DI, SF-36 PCS, and MCS scores through Week 24 were sustained through Week 52.Conclusion.Patients with active RA despite MTX had significant improvement in physical function, general health, and fatigue following golimumab + MTX therapy; improvements in physical function and general health were maintained through Week 52. (Clinical Trials Registration NCT00264550)
Indirect Treatment Comparison of Abatacept with Methotrexate Versus Other Biologic Agents for Active Rheumatoid Arthritis Despite Methotrexate Therapy in the United Kingdom
Authors: GUYOT PATRICIA , TAYLOR PETER C. , CHRISTENSEN ROBIN , PERICLEOUS LOUISA , DROST PIETER , EIJGELSHOVEN INDRA , BERGMAN GERT , LEBMEIER MAXIMILIAN 
Published: April 2012

Objective.To compare the efficacy of abatacept and alternative biologic disease-modifying antirheumatic drugs (DMARD) in patients with rheumatoid arthritis (RA) and an inadequate response to methotrexate (MTX) in the United Kingdom.Methods.A systematic literature search identified 11 individual studies investigating the efficacy of abatacept, infliximab, adalimumab, etanercept, certolizumab pegol, and golimumab in adult patients with RA that did not respond to MTX. The clinical trials included in this analysis were similar in trial design, baseline patient characteristics, and background therapy (i.e., MTX). The key clinical endpoints of interest were the Health Assessment Questionnaire (HAQ) change from baseline (CFB) and the American College of Rheumatology (ACR) responses at 6 months (24–28 weeks). Results were analyzed using Bayesian network metaanalysis methods, and were expressed as differences in HAQ CFB and ACR20/50/70 relative risks, with 95% credible limits (CrL).Results.Analysis of HAQ CFB at 6 months showed that abatacept is more efficacious than placebo [mean difference in HAQ CFB: −0.30 (95% CrL −0.42; −0.16)] and comparable to all other biologic agents, in patients receiving MTX as background treatment. Abatacept is also expected to result in a higher proportion of ACR responders compared to placebo, with relative risks ranging from 1.90 (95% CrL 1.24; 2.57) for ACR20 to 3.72 (95% CrL 1.50; 10.52) for ACR70, and to result in comparable proportions of ACR responders as other biologic agents, at 6 months.Conclusion.Abatacept is expected to result in improvement in functional status comparable to other recommended biologic agents in patients with RA who are unresponsive to MTX in the UK.