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Agricultural Sciences 2024年第7期15卷 780-799页

作者： Azizul Hoque md. Maniruzzaman Sikder Abul Khair Bangladesh Agricultural Development Corporation Dhaka Bangladesh Department of Botany Jahangirnagar University Dhaka Bangladesh Hamdard University Gazaria Bangladesh

An experiment was meticulously conducted at the research field of Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur, Bangladesh, during the 2011-2012 potato growing season to develop integrated crop management practices for the potato seed production of industrial processing varieties Asterix and Courage. Significantly, higher growth and yield parameters were found in the BADC-recommended practice. Later, another experiment was conducted to validate the BADC practice during the 2013-2014 potato growing season in two locations in Bangladesh. Results showed that the production of tuber per hill, tuber weight per hill as well as gross tuber yield per plot, higher proportion of storable seed tubers, and more quality seed potatoes (A-grade and B-grade) seed tubers were found significantly higher in the “BADC developed practice” compared to other treatments. Viral diseases (PLRV and PVY) prevalence was lower in “BADC developed practice”. Moreover, “BADC developed practice” contributed more economic yield by minimizing input cost compared to “Munshiganj advanced farmers’ practice”. Therefore, the “BADC developed practice” was found “superior” regarding yield, quality, and profitability in seed potato production of industrial varieties—Asterix and Courage in Bangladesh.

关键词： Integrated Nutrient Industrial Processing Potatoes

Effect of Exchange-Correlation Functional on the Structural, Mechanical, and Optoelectronic Properties of Orthorhombic RbSrBr3 Perovskite

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Materials Sciences and Applications 2024年第6期15卷 137-154页

作者： Fatema Najrin Rabeya Bakar Sarna md. alamin Sarker Budrun Neher md. Mahbubur Rahman Bhuiyan Farid Ahmed Department of Physics Jahangirnagar University Dhaka Bangladesh Department of Electrical and Electronics Engineering Green University of Bangladesh Purbachal American City Kanchan Rupganj Narayanganj-1461 Dhaka Bangladesh

In the present study, the effect of the exchange-correlation functional on the structural, mechanical, and optoelectronic properties of orthorhombic RbSrBr3 perovskite has been investigated using various functionals in Density Functional Theory (DFT) with the CASTEP code. The optimized lattice parameters are quite similar for all the functionals. The electronic properties have shown that RbSrBr3 perovskite is a wide direct band gap compound with a band gap energy ranging from 4.296 eV to 4.494 eV for all the functionals. The mechanical parameters like elastic constants, Young’s modulus, Shear modulus, Poisson’s ratio, Pugh’s ratio, and an anisotropic factor reveal that the RbSrBr3 perovskite has ductile behavior and an anisotropic nature which signifies the mechanical stability of the compound. The Debye temperature might withstand lattice vibration heat. High absorption coefficient (>104 cm−1), high optical conductivity, and very low reflectivity have been found in the RbSrBr3 perovskite for all functions. The computed findings on the RbSrBr3 perovskite suggested that the presented studied material is potentially applicable for photodetector and optoelectronic devices.

关键词： Density Functional Theory Mechanical Properties Photodetector Ductility Anisotropic Factor

A Computational Investigation on the Control of Cavity-Induced Pressure Oscillations Using Sub-Cavity

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Journal of Thermal Science 2006年第3期15卷 213-219页

作者： md.Mahbubul alam ShigeruMatsuo KenbuTeramoto ToshiakiSetoguchi Heuy-Dong Kim Department of Mechanical Engineering Chittagong University of Engineering and TechnologyChittagong 4349Bangladesh Department of Mechanical Engineering Saga University1Honjo-machiSaga shiSaga 840-8502Japan School of Mechanical Engineering College of Natural ScienceAndong National University388Song Cheon DongAndongKyung PookRepublic of Korea

A computational investigation has been conducted to determine the effectiveness of a passive control technique of attenuating cavity-induced pressure oscillations in a confined two-dimensional supersonic flow. The passive control technique is achieved by fitting two flat plates near the front wall of a square cavity at Mach number 1.83 at the cavity entrance. The results showed that the flat plates attached near the front wall of the cavity, discouraged the formation of feedback loop which is widely believed to be the reason of cavity resonance. The resultant amount of attenuation of pressure oscillations was also dependent on the length of the flat plate used as an oscillation suppressor.

关键词： compressible flow cavity-induced pressure oscillations passive control sub-cavity

Financial management for custom hire service of tractor in Bangladesh

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International Journal of Agricultural and Biological Engineering 2013年第3期6卷 28-33页

作者： Anisur Rahman Most.Latifunnahar md Monjurul alam Department of Farm Power and Machinery Bangladesh Agricultural UniversityMymensingh-2202Bangladesh

The main purpose of the study was to determine the economic parameters and effective schedules for tractor *** data from various sources were used in this *** essential data were collected from primary sources through *** costs were calculated and project financial profitability was determined by four major factors on farm financial measurement techniques,namely,benefit-cost ratio(BCR),net present value(NPV),internal rate of return(IRR),and payback *** the economic use,land topography and cropping pattern was developed to effective scheduling for tractor *** operating cost of tractor with implement was found to be US$9.25 per *** replacement of the existing tractor on expiry of economic life,the entrepreneur has to save an amount of US$219 per year in a bank *** on the operating cost,annual savings for replacement and a profit margin for the entrepreneur,the rent-out charge of the tractor is estimated at US$11.58 per *** 10%interest rate,the NPV of the tractor at existing condition is US$*** NPV of tractor indicates that tractor entrepreneurship is considered financially sound and the project is financially viable,with an average IRR of 36.96%.This is because IRR of the tractor was higher than the bank interest rate and it is highly profitable from the viewpoint of individual *** Payback period of tractor with implement was determined as 2.03 *** minimum tenure for an economic use of a common tractor used in agriculture is about 6310 *** this critical use,the utilization of a tractor is economical for a tractor *** on the cropping pattern two major and one minor turn-around periods are available in between cropping seasons for tilling *** time available for tilling of land is estimated about 140 days at 12 hours a day in a *** strengthen the existing capacity of the tractor customer hire service entrepreneurs an

关键词： tractor operating cost economic parameter effective scheduling tractor entrepreneur Bangladesh

Phytochemical Screening and Evaluation of Pharmacological Potential of Baliospermum solanifolium Leaf Extract

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Clinical Complementary Medicine and Pharmacology 2024年第1期4卷 69-75页

作者： Amit Mazumder Rabindra Nath Acharyya Milton Kumar Kundu Pritam Kundu md.Amirul Islam md.Mustafizur Rahman Pharmacy Discipline Khulna UniversityKhulna-9208Bangladesh

Background:Baliospermum solanifolium is a traditional medicinal plant,locally known as“dantigaacha”from Eu-phorbiaceae family,and has been used in different diseases treatments likes helminthiasis,skin diseases,diabetes,snake-bite,and ***:Depending on the traditional uses of *** and the lack of scientific works,we aimed to conduct some pharmacological tests on its ***:Active constituents of *** were assessed by qualitative ***(2,2-diphenyl-1-picrylhydrazyl)was used for free radical scavenging *** change and mortality rate were used as indicators to assess the toxicity of *** antidiabetic potential was evaluated by oral glucose toler-ance test(OGTT)and alpha-glucosidase enzyme inhibitory *** antidiarrheal activity,castor oil-induced mice were *** test was carried out by disk diffusion assay and MIC ***,analgesic activity was done by acetic acid-induced writhing ***:*** contains alkaloids,carbohydrates,glycosides,flavonoids,tannis,phenolics *** toxicity test ensured the safety of the *** DPPH,the extract showed antioxidant activity with an IC50(con-centration needed to scavenge 50%DPPH)value of 61.65μg/*** phenolic,flavonoid and tannin contents were determined as 124 mg GAE/g,440 mg QE/g and 344 mg GAE/g dried extract,*** OGTT,the ex-tract reduced the blood glucose level *** the alpha-glucosidase inhibitory activity,the plant showed a concentration-dependent reduction of the enzyme at IC50 of 8.53 mg/*** the antidiarrheal test,*** inhibit defecation 30.69%and 53.41%at dose 250 mg/kg and 500 mg/kg,*** extract also showed antibacterial activity against four bacterial strains in the disk diffusion method and minimum inhibitory concen-tration(MIC)values were 62.5μg/mL,62.5μg/mL,125μg/mL and 62.5μg/mL against four bacterial strains,*** an

关键词： Baliospermum solanifolium Antioxidant Antidiabetic Antidiarrheal Antibacterial Analgesic

Statistical optimization of adsorption processes for removal of 2,4-dichlorophenol by activated carbon derived from oil palm empty fruit bunches

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Journal of Environmental Sciences 2007年第6期19卷 674-677页

作者： md.Zahangir alam Suleyman A.MUYIBI Juria TORAMAE Bioenvironmental Engineering Research Unit Department of Biotechnology EngineeringFaculty of EngineeringInternational Islamic UniversityMalaysia Jalan Gombak53100 Kuala LumpurMalaysia

The adsorption capacity of activated carbon produced from oil palm empty fruit bunches through removal of 2,4-dichlorophenol from aqueous solution was carried out in the laboratory. The activated carbon was produced by thermal activation of activation time with 30 min at 800℃. The adsorption process conditions were determined with the statistical optimization followed by central composite design. A developed polynomial model for operating conditions of adsorption process indicated that the optimum conditions for maximum adsorption of phenolic compound were： agitation rate of 100 r/min, contact time of 8 h, initial adsorbate concentration of 250 mg/L and pH 4. Adsorption isotherms were conducted to evaluate biosorption process. Langmuir isotherm was more favorable （R^2=0.93） for removal of 2,4-dichlorophenol by the activated carbon rather than Freundlich isotherm （R^2=0.88）.

关键词： activated carbon adsorption oil palm empty fruit bunches 2,4-dichlorophenol

Exact traveling wave solutions to higher order nonlinear equations

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Journal of Ocean Engineering and Science 2019年第3期4卷 276-288页

作者： md Nur alam Xin Li School of Mathematical Sciences University of Science and Technology of ChinaHefeiAnhuiChina

The present paper applies the new generalized(G/G)-expansion method on three non-linear equations including the fifth-order Korteweg-de Vries equation,(3+1)-dimensional Modified KdV-Zakharov-Kuznetsov equation,and(3+1)-dimensional Jimbo-Miwa equations and obtains some new exact traveling wave *** solutions are checked by putting back into the physical model and are observed to be very advantageous over several existing *** newly method could also be utilized to find exact traveling wave solutions for the other nonlinear evolution equations in the field of applied nonlinear sciences.

关键词： traveling nonlinear wave

Cumulative Air Quality Impacts from Twenty-Two Major Power Plants

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Journal of Environmental Science and Engineering(A) 2024年第1期13卷 1-14页

作者： md M.Karim Navin Bindra Arub Masud Environment Health and Safety DepartmentGEEC Ltd.108 Earlsbridge Blvd.BramptonOntarioL7A 3W7Canada Department of Health Science University of WaterlooWaterlooOntarioN2L 3G1Canada

Cumulative assessment is a tool for the project developer to try and take into consideration not only their contribution to cumulative impacts but also other projects and external factors that may place their developments at *** study assessed the cumulative impacts of air emissions from 22 major power plants in southeast Bangladesh planned to generate 21,550 MW of *** also includes anticipated growth in small to medium size industries,brickfields,highway traffic,inland water transport,transhippers,jetty,and vessel transports used for transporting fuel resources for these power plants.A 50 km by 50 km airshed is considered for air quality *** analysis indicates that predicted MGLCs(Maximum Ground Level Concentrations)of NO2 and CO are complying with both Bangladesh NAAQS(National Ambient Air Quality Standards)and WBG(World Bank Group)*** daily average MGLC of PM_(2.5)(62.45µg/m^(3))from all sources complies with NAAQS,however,exceeds the WBG *** PM_(2.5) concentration(15.45µg/m^(3))exceeds NAAQS and WBG *** PM10 concentration complies with the NAAQS for both 24-hour and annual averaging *** average concentration(23.12µg/m^(3))exceeds WBG *** average SO2 concentration(102.49µg/m^(3))complies with the NAAQS however,it exceeds the WBG guideline *** concentrations of PM_(2.5) and SO2 are due to the contribution of transboundary emissions and secondary pollutants in the *** dispersion modeling outcome can be used by the policymakers for the pollution reduction strategy.

关键词： CIA(Cumulative Impact Assessment) dispersion modeling power generation Bangladesh.

Preoperative Serum Albumin Levels and Postoperative Acute Kidney Injury in Off-Pump Coronary Artery Bypass Surgery: A Single-Center Study in Bangladesh

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World Journal of Cardiovascular Surgery 2024年第8期14卷 131-144页

作者： Ahmad Pear Salahuddin md. Abir Tazim Chowdhury Munama Magdum Dewan Iftakher Reza Chowdhury Nittya Nanda Pal md. Nahedul Morshed md. Zafar-Al-Nimari Latifa Nasrin Farooque Ahmed Department of Cardiac Surgery National Heart Foundation Hospital and Research Institute (NHFH&RI) Dhaka Bangladesh Department of Cardiothoracic and Vascular Surgery Evercare Hospital Dhaka Dhaka Bangladesh National Institute of Preventive and Social Medicine Dhaka Bangladesh Mother and Child Welfare Center Cumilla Bangladesh

Background: Serum albumin, a vital plasma protein, helps maintain intravascular colloidal osmotic pressure, cardiac output, and renal function. Low preoperative serum albumin is linked to poor outcomes, including acute kidney injury (AKI), after off-pump coronary artery bypass (OPCAB) surgery. This study aimed to assess the relationship between preoperative serum albumin levels and early postoperative renal injury. Methods: This prospective comparative cross-sectional study was conducted from August 2019 to February 2021 at the National Heart Foundation Hospital & Research Institute, Bangladesh. It included 160 adult patients with normal preoperative renal function undergoing OPCAB. Patients were divided into two groups: Group A (serum albumin ≥ 4.0 gm/dl) and Group B (serum albumin Results: Preoperative serum albumin was significantly different between groups (Group A: 4.21 ± 0.05 gm/dl, Group B: 3.69 ± 0.04 gm/dl, p = 0.028). Group B had a higher incidence of hypertension (71.25% vs. 51.25%, p st and 3rd postoperative days were higher in Group B (p th day. Postoperative AKI occurred in 18.75% of Group A and 36.25% of Group B. Multivariate regression indicated that low preoperative serum albumin is an independent risk factor for postoperative AKI (p = 0.012, OR = 1.815, CI: 0.675 - 1.162). Conclusion: Preoperative serum albumin level is a valuable predictor of postoperative renal function. Ensuring high normal serum albumin levels before surgery can help minimize the risk of postoperative AKI.

关键词： Serum Albumin Acute Kidney Injury (AKI) Off-Pump Coronary Artery Bypass Surgery Bangladesh

A critical review of ash slagging mechanisms and viscosity measurement for low-rank coal and bio-slags

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Frontiers in Energy 2021年第1期15卷 46-67页

作者： md Tanvir alam Baiqian DAI Xiaojiang WU Andrew HOADLEY Lian ZHANG Department of Chemical Engineering Monash UniversityClaytonVictoria 3800Australia R&D Division Shanghai Boiler Works Co.Ltd.Shanghai 200245China

Gasification or combustion of coal and biomass is the most important form of power generation ***,the use of coal/biomass at high temperatures has an inherent problem related to the ash *** formation of ash leads to a problematic phenomenon called *** is the accumulation of molten ash on the walls of the furnace,gasifier,or boiler and is detrimental as it reduces the heat transfer rate,and the combustion/gasification rate of unburnt carbon,causes mechanical failure,high-temperature corrosion and on occasions,superheater *** improve the gasifier/combustor facility,it is very important to understand the key ash properties,slag characteristics,viscosity and critical viscosity *** paper reviews the content,compositions,and melting characteristics of ashes in differently ranked coal and biomass,and discusses the formation mechanism,characteristics,and structure of *** particular,this paper focuses on low-rank coal and biomass that have been receiving increased attention ***,it reviews the available methodologies and formulae for slag viscosity measurement/prediction and summarizes the current limitations and potential ***,it discusses the slagging behavior of different ranks of coal and biomass by examining the applicability of the current viscosity measurement methods to these fuels,and the viscosity prediction models and factors that affect the slag *** review shows that the existing viscosity models and slagging indices can only satisfactorily predict the viscosity and slagging propensity of high-rank coals but cannot predict the slagging propensity and slag viscosity of low-rank coal,and especially biomass ashes,even if they are limited to a particular composition ***,there is a critical need for the development of an index,or a model or even a measurement method,which can predict/measure the slagging propensity and slag viscosity correctly for all low-rank co

关键词： slag viscosity biomass low-rank coal combustion gasification