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American Journal of Operations Research 2023年第2期13卷 19-32页

作者： Samsun Nahar Marin Akter md. abdul Alim Department of Basic Sciences and Humanities University of Asia Pacific Dhaka Bangladesh General Education Department City University Dhaka Bangladesh Department of Mathematics Bangladesh University of Engineering and Technology Dhaka Bangladesh

A multi-objective linear programming problem is made from fuzzy linear programming problem. It is due the fact that it is used fuzzy programming method during the solution. The Multi objective linear programming problem can be converted into the single objective function by various methods as Chandra Sen’s method, weighted sum method, ranking function method, statistical averaging method. In this paper, Chandra Sen’s method and statistical averaging method both are used here for making single objective function from multi-objective function. Two multi-objective programming problems are solved to verify the result. One is numerical example and the other is real life example. Then the problems are solved by ordinary simplex method and fuzzy programming method. It can be seen that fuzzy programming method gives better optimal values than the ordinary simplex method.

关键词： Fuzzy Programming Method Fuzzy Linear Programming Problem Multi-Objective Linear Programming Problem Statistical Averaging Method New Statistical Averaging Method

Solving Fuzzy Multi-Objective Linear Programming Problem by Applying Statistical Method

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American Journal of Operations Research 2022年第6期12卷 293-309页

In this paper, the statistical averaging method and the new statistical averaging methods have been used to solve the fuzzy multi-objective linear programming problems. These methods have been applied to form a single objective function from the fuzzy multi-objective linear programming problems. At first, a numerical example of solving fuzzy multi-objective linear programming problem has been provided to validate the maximum risk reduction by the proposed method. The proposed method has been applied to assess the risk of damage due to natural calamities like flood, cyclone, sidor, and storms at the coastal areas in Bangladesh. The proposed method of solving the fuzzy multi-objective linear programming problems by the statistical method has been compared with the Chandra Sen’s method. The numerical results show that the proposed method maximizes the risk reduction capacity better than Chandra Sen’s method.

关键词： Fuzzy Multi-Objective Linear Programming Problem Fuzzy Linear Programming Problem Chandra Sen’s Method Statistical Averaging Method New Statistical Averaging Method

维持河流健康生命——孟加拉国阿德赖河和巴拉河流域水资源保护与管理

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人民黄河 2005年第11期27卷 59-60页

作者： md.abdul Ghani 孟加拉国达卡国际水稻研究机构

孟加拉国的河流淡水资源量位居世界第三。3条主要河流即恒河、雅鲁藏布江和梅克纳河，径流量仅次于流经巴西的亚马孙和非洲的刚果河。需要指出的是，流经孟加拉国的237条河流中有57条穿过盂加拉国国界（国际河流）。流经恒河与雅鲁藏布... 详细信息

孟加拉国的河流淡水资源量位居世界第三。3条主要河流即恒河、雅鲁藏布江和梅克纳河，径流量仅次于流经巴西的亚马孙和非洲的刚果河。需要指出的是，流经孟加拉国的237条河流中有57条穿过盂加拉国国界（国际河流）。流经恒河与雅鲁藏布江的年径流量，水平铺在孟加拉国国土上约有5．5m深。盂加拉国平均年降雨量2000mm，而且90％集中在雨季。因此，所有的有效水量平铺在孟加拉国国土上约有7．5m深。然而，盂加拉国11月至次年5月依然面临水资源短缺，同时，由于降雨及其径流的年际不均，还遭受洪水威胁。3～5月份，西南、西北地区非常干燥，河流出现季节性断流。位于中部和东部的河流由于受到海湾潮汐的影响，至少是在潮位较高的时候，可以保持不断流。本研究提出一些通过提高管理水平保持阿德赖河和巴拉河全年不断的方法途径，有助于提高农作物的产量和渔业产量。

关键词：孟加拉国水资源保护河流域雅鲁藏布江季节性断流管理生命健康年径流量年降雨量

Image-Based Feature Extraction Technique for Inclined Crack Quanti cation Using Pulsed Eddy Current

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Chinese Journal of Mechanical Engineering 2019年第2期32卷 113-121页

作者： Faris Nafah Ali Sophian md Raisuddin Khan Syamsul Bahrin abdul Hamid Ilham Mukriz Zainal Abidin Department of Mechatronics Engineering Faculty of Engineering International Islamic University Malaysia Leading Edge NDT Group Malaysian Nuclear Agency

Existing eddy current non-destructive testing(NDT) techniques generally do not consider the inclination angle of inclined cracks, which potentially harms a larger region of a tested structure. This work proposes the use of 2 D scan images generated by using pulsed eddy current(PEC) non-destructive testing(NDT) technique in the quantification of the inclination and depth of inclined cracks. The image-based feature extraction technique e ectively identifies the crack axis, which consequently enables extraction of features from the extracted linear scans. The technique extracts linear scans from the images to allow the extraction of three novel image-based features, namely the length of extracted linear scans(LLS), the linear scan skewness(LSS), and the highest value on linear scan(LSmax). The correlation of the three features to surface crack inclination angles and depths were analysed and found to be highly dependent on the crack depths, while only LLS and LSS are correlated to the crack inclination angles.

关键词： Pulsed eddy current 2D scan imaging Feature extraction Image processing Inclined cracks

Exploration of sex-specific and age-dependent COVID-19 fatality rate in Bangladesh population

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World Journal of Radiology 2021年第1期13卷 1-18页

作者： md abdul Alim Al-Bari Showna Hossain md Kudrat-E Zahan 不详 Department of Pharmacy University of RajshahiRajshahi 6205Bangladesh Department of Chemistry University of RajshahiRajshahi 6205Bangladesh

Coronavirus disease-2019(COVID-19),a respiratory tract infection caused by severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)has become a global health emergency and a threat the entire *** COVID-19 shows a wide spectrum of clinical presentations,severity,and fatality *** the fatal outcomes of the COVID-19 pandemic are evident in all age groups,the most devastating impact on the health consequences and death from COVID-19 are associated with older adults,especially older ***-19 pandemic is affecting different countries in the world especially in the 65+years age male *** fact,several genes involved into the regulation of the immune system are strategically placed on the X-chromosome and trigger a gendered mediated antiviral *** aim of this study is to explore and exploit whether a relationship exists between male sex and COVID-19 mortality and the relationship is age *** we discuss the possible role of physiological and immunological sex differences into the higher morbidity and mortality of SARSCoV-2 between females and *** gender differences in COVID-19 offers a window into the principles of immunity against SARS-CoV-2 infection and this information on ageing dependent gender disparity might contribute to our current understanding of COVID-19 infection and disease treatment.

关键词： COVID-19 Gender Sex hormones Angiotensin-converting enzyme 2 TMPRSS2 TLR7

Preparation and Characterization of Raw and Chemically Modified Sponge-Gourd Fiber Reinforced Polylactic Acid Biocomposites

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Materials Sciences and Applications 2018年第2期9卷 281-304页

作者： Taimur -Al-Mobarak md. abdul Gafur md. Forhad Mina Department of Physics Bangladesh University of Engineering & Technology (BUET) Dhaka Bangladesh Pilot Plant & Process Development Center Bangladesh Council of Scientific & Industrial Research (BCSIR) Dhaka Bangladesh

This research work has been undertaken to fabricate environmentally friendly biocomposites for biomedical and household applications. Sponge-gourd fibers (SGF) obtained from Luffa cylindrica plant were chemically treated separately using 5 and 10 wt% NaOH, acetic anhydride and benzoyl chloride solutions. SGF reinforced polylactic acid (PLA) biocomposites were fabricated using melt compounding technique. Surface morphological, structural, mechanical and thermal properties, as well as antibacterial activities of raw and chemically modified SGF reinforced PLA (SGF-PLA) composites were characterized by field emission scanning electron microscopy, Fourier transform infrared spectrometry, X-ray diffractometry, universal testing method, thermogravimetry, and Kirby-Bauer agar diffusion method, respectively. Surface morphology indicates that after treatment of fibers, the interfacial adhesion between PLA and fibers is improved. X-ray diffractometry result shows that chemical treatment of fibers improves the crystallinity and exhibits new chemical bond formation in the composites. After chemical treatment, compressive strength of the composites is found to increase by 10% - 35%. The thermal stability of the treated fiber reinforced composites is also found to increase significantly. The composites have no antibacterial activities and no cytotoxic effect on non-cancer cell line. Soil burial test has confirmed that the composites are biodegradable. Benzoyl chloride treatment of fibers shows superior mechanical properties and enhances thermal stability among the composites.

关键词： Sponge-Gourd Fiber Polylactic Acid Chemical Modification Biocomposites Antibacterial Activities

Effect of Plant Extracts on Seed Borne Fungi of Jute

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American Journal of Plant Sciences 2018年第13期9卷 2580-2592页

作者： md. abdul Ahad md. Shahidul Islam Nur Fatema Nupur Department of Plant Pathology Bangladesh Agricultural University Mymensingh Bangladesh Department of Plant Pathology Yunnan Agricultural University Kunming China Department of Fisheries Management Bangladesh Agricultural University Mymensingh Bangladesh

The aim of this study was to determine the prevalence of seed-borne fungal pathogens of jute and their control with plant extract. The experiment was carried out in seed pathology centre, Bangladesh Agricultural University to obtain relevant information about the health of jute seeds and find out the efficacy of extracts as seed-treater. Two varieties viz., Deshipat (Corchorus capsularis) and Tossapat (Corchorus olitorius) were selected for this study and jute seeds were collected from two different locations of Bangladesh. The major predominant identified fungi were Colletotrichum corchori, Macrophomina phaseolina, Fusarium spp., and Botryodiplodia theobromae. Least seed-borne fungi were found in the variety of Tossapat. Low germination of seeds was found related to high prevalence of seed-borne fungal infections. Highest seed-borne infection was obtained in the variety of Deshipat. In this study, we evaluated some major plant extracts such as garlic clove (Allium sativum), neem leaves (Azadirachta indica), allamanda leaves (Allamanda cathartica L.) and marigold leaves (Tagetes spp.) for observing the action of these plant extracts on seed borne fungi of Jute. The study revealed that the extract of Garlic (Allium sativum), and Biskatali (Polygonum hydropiper) increased the germination of seeds and garlic?(Allium sativum) extract was also found to be most effective in controlling the seed-borne infection among all the treatments. Although the inhibiting capacity of the extracts of Allamanda (Allamanda cathartica L.) and Biskatali (Polygonum hydropiper) was found to be similar and Biskatali extract was found to have the second position among all the treated plant extracts in inhibiting the growth of isolated fungal pathogens.

关键词： Botanical Treatment Medicinal Plant Bio-Control Seed Jute

Leaf Water Status and Its Relationship with Reproductive Responses of Common Bean (<i>Phaseolus vulgaris</i>L.) Genotypes under Water Stress

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American Journal of Plant Sciences 2014年第11期5卷 1547-1556页

作者： Apurba Kanti Choudhury md abdul Karim md Moynul Haque Qazi abdul Khaliq Jalal Uddin Ahmed Mohammad Mofazzal Hossain Department of Agronomy Bangabandhu Sheikh Mujibur Rahman Agricultural University Gazipur Bangladesh Department of Crop Botany Bangabandhu Sheikh Mujibur Rahman Agricultural University Gazipur Bangladesh Department of Horticulture Bangabandhu Sheikh Mujibur Rahman Agricultural University Gazipur Bangladesh On-Farm Research Division Bangladesh Agricultural Research Institute Joydebpur Bangladesh

Two tolerant (BB24 and BB43) and two susceptible (BARI busbean-2 and BB04) genotypes of common bean (Phaseolus vulgaris L.) were evaluated for their water status and its relationship with reproductive responses under continuous water stress (50% field capacity) and control (80% field capacity) conditions in a net house covered with polyethylene sheet at the Bangabandhu Sheikh Mujibur Rahman Agricultural University, Bangladesh. Under water stress condition, the susceptible genotype namely BB04 exhibited more negative leaf water potential (LWP) which was followed by that of BARI bushbean-2 in all the time of the day except at noon. The tolerant genotype namely BB24 exhibited less negative LWP at noon. The tolerant genotypes maintained higher relative water content (WRC) than the susceptible ones from dawn to dusk. The relationship between RWC and LWP was examined separately for four genotypes under water stress condition. The genotype BB24 showed a smaller decrease in RWC with more negative LWP than BB04. Water stress reduced pod setting ratio. The relationship between the leaf water status and reproductive responses showed that the genotype with a little reduction in mid-day drop of RWC or with high mid-day RWC displayed a high pod setting ratio.

关键词： Leaf Water Potential Pod Setting Ratio Relative Water Content

Structural and Mechanical Properties of Alumina-Zirconia (ZTA) Composites with Unstabilized Zirconia Modulation

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Materials Sciences and Applications 2021年第11期12卷 542-560页

作者： md. abdul Gafur md. Al-Amin md. Saifur Rahman Sarker md. Zahangir Alam Pilot Plant & Process Development Centre Bangladesh Council of Scientific and Industrial Research Dhaka Bangladesh Department of Applied Chemistry and Chemical Engineering Dhaka University Dhaka Bangladesh Kurigram Govt. College Kurigram Rangpur Bangladesh

Zirconia toughened alumina (ZTA) ceramics are very promising materials for structural and biomedical applications due to their high hardness, fracture toughness, strength, corrosion and abrasion resistance and excellent biocompatibility. The effect of unstabilized ZrO2 on the density, fracture toughness, microhardness, flexural strength and microstructure of some Zirconia-toughened alumina (ZTA) samples was investigated in this work. The volume percentage of unstabilized ZrO2 was varied from 0% - 20% whereas sintering time and sintering temperature were kept constant at 2 hours and 1580°C. The samples were fabricated from nanometer-sized (α-Al2O3: 150 nm, monoclinic ZrO2: 30 - 60 nm) powder raw materials by the conventional mechanical mixing process. Using a small amount of sintering aid (0.2 wt% MgO) almost 99.2% of theoretical density, 8.54 MPam? fracture toughness, 17.35 GPa Vickers microhardness and 495.67 MPa flexural strength were found. It was observed that the maximum flexural strength and fracture toughness was obtained for 10 vol% monoclinic ZrO2 but maximum Vickers microhardness was achieved for 5 vol% ZrO2 although the maximum density was found for 20 vol% ZrO2. It is assumed that this was happened due to addition of denser component, phase transformation of monoclinic ZrO2 and the changes of grain size of α-Al2O3 and ZrO2.

关键词： Zirconia Toughened Alumina (ZTA) Mechanical Properties Toughening XRD SEM Grain Size

Photocatalytic Degradation of Oxytetracycline Dihydrate from Aqueous Solution Using Nano ZnO and ***3 (x = 3%, 18%, 33% and 48%)

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Materials Sciences and Applications 2023年第12期14卷 515-525页

作者： Preyanty Sen Suraya Sabrin Soshi md. abdul Gafur Department of Applied Chemistry and Chemical Engineering University of Dhaka Dhaka Bangladesh Department of Mechanical Engineering Ahsanullah University of Science and Technology Dhaka Bangladesh Bangladesh Council of Scientific and Industrial Research (BCSIR) Dhaka Bangladesh

Traditional wastewater mostly contains pharmaceutical ingredients. Therefore, the wastewater must be completely free from antibiotics before its release into the environment. In the present study, photocatalytic degradation was done to investigate the removal efficiency of Oxytetracycline Dihydrate (OTC) using ZnO, ZnO/3%BaTiO3 (3 BZ), ZnO/18%BaTiO3 (18 BZ), ZnO/ 33%BaTiO3 (33 BZ) and ZnO/48%BaTiO3 (48 BZ) under UV light. After the exposure time of 420 min, about 99.57% and 97.87% of OTC was degraded using ZnO and 3 BZ respectively. Further, increasing the amount of BaTiO3 in ZnO prolongs the degradation time. Therefore, faster efficiency was found using ZnO nanoparticles. The observed reaction rate constant using ZnO was 0.00933 min-1 which decreased to 0.00532 min-1 using 48 BZ, indicating the decrease of reaction rate for increasing the amount of BaTiO3. Hence, the use of ZnO photocatalyst is anticipated to be a promising technique for the photocatalytic degradation of contaminated wastewater with oxytetracycline antibiotics using UV light.

关键词： Advanced Oxidation Process (AOP) Antibiotics Zinc Oxide (ZnO) and Barium Titanate (BaTiO3)