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Aeromonas veronii isolated from climbing perch(Anabas testudineus)suffering from epizootic ulcerative syndrome(EUS)

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Aquaculture and Fisheries 2023年第3期8卷 288-295页

作者： Rakib Ehsan Ashikur rahman Sulav Indra Paul md.Ali Arman Ador md.Shameul Haque Tasmina Akter md.Mahbubur rahman Institute of Biotechnology and Genetic Engineering Bangabandhu Sheikh Mujibur Rahman Agricultural UniversityGazipur1706Bangladesh Department of Fisheries Management Faculty of FisheriesBangabandhu Sheikh Mujibur Rahman Agricultural UniversityGazipur1706Bangladesh

Motile Aeromonads are responsible for various diseases in fishes that cause significant economic losses in *** *** also frequently isolated from fish suffering from Epizootic Ulcerative Syndrome(EUS).The present study was conducted to isolate and identify *** from Vietnam climbing perch(Anabas testudineus)suffering from EUS,evaluate the pathogenicity of the isolates,and find out antibiogram profile and susceptibility of the isolates to medicinal plant *** climbing perch(***)suffering from EUS was collected from fish farms located at Savar,Dhaka and bacteria were isolated from the external ulcerative lesion,and kidney and liver of the infected fish on nutrient agar *** phenotypic identification of the bacterial isolates was performed following morphological,physiological and biochemical characterization *** 16S rRNA gene sequencing was accomplished for further molecular identification of five selected *** evaluate the pathogenicity of the isolates in vivo artificial infection challenge test was conducted through immersion *** in vivo pathogenicity test was done at three different temperatures(18◦C,28◦C,and 37◦C)to examine the effects of temperature on the pathogenicity of the *** commercial antibiotics were used to find out the antibiogram profile of the ***,susceptibility of the isolates was screened against 19 medicinal plants extracts.A total of 38 out of 46 isolates isolated from Vietnam climbing perch(***)suffering from EUS were phenotypically identified as Aeromonas *** randomly selected isolates were further confirmed as *** by analyzing the 16S rRNA gene sequence *** pathogenicity of the isolates was found moderate to high(41%-80%mortality)in the artificially challenged *** highest and lowest mortality was obtained in the fish challenged with the isolates BFKA33 and BFKA12,*** isolates were found resis

关键词： Aeromonas veronii Anabas testudineus,Epizootic ulcerative syndrome Antibiogram Medicinal plant extracts

Braking Performance of a Biomimetic Squid-Like Underwater Robot

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Journal of Bionic Engineering 2013年第3期10卷 265-273页

作者： md. Mahbubar rahman Sinpei Sugimori Hiroshi Miki Risa Yamamoto Yugo Sanada Yasuyuki Toda Laboratory of Hull Form Design Department of Naval Architecture and Ocean Engineering Graduate School of Engineering Osaka University Osaka 565-0871 Japan

In this study, the braking performance of the undulating fin propulsion system ofa biomimetic squid-like underwater robot was investigated through free run experiment and simulation of the quasi-steady mathematical model. The quasi-steady equa- tions of motion were solved using the measured and calculated hydrodynamic forces and compared with free-run test results. Various braking strategies were tested and discussed in terms of stopping ability and the forces acting on the stopping stage. The stopping performance of the undulating fin propulsion system turned out to be excellent considering the short stopping time and short stopping distance. This is because of the large negative thrust produced by progressive wave in opposite direction. It was confirmed that the undulating fin propulsion system can effectively perform braking even in complex underwater explorations.

关键词： biomimetics squid-like underwater robot undulating fin propulsion system braking performance motion simulation

Optimal treatment strategies to control acute HIV infection

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Infectious Disease Modelling 2021年第1期6卷 1202-1219页

作者： Shohel Ahmed Sumaiya rahman md Kamrujjaman Department of Mathematics Bangladesh University of Engineering and TechnologyDhaka1000Bangladesh Department of Statistics University of DhakaDhaka1000Bangladesh Department of Mathematics University of DhakaDhaka1000Bangladesh

Various antiretroviral therapies(ART)are administered to symptomatic human immunodeficiency virus(HIV)infected individuals to improve their *** treatment effectiveness may depend on suppressing development of drug resistance,reduce evolution of new viral strains,minimize serious side effects and the costs of *** paper deals with some results concerning optimal drug administration scheme successful in improving patients'health especially in poorly resourced *** model under consideration describes the interaction between the uninfected cells,the latently infected cells,the productively infected cells,and the free ***,in viral infection,the drug strategy aspects either the virus infectivity or reduce the virion *** mathematical model proposed here,deals with both situations with the objective function based on a combination of maximizing benefit relied on T cells count(the white cells that coordinate activities of the immune system)and minimizing the systemic *** existence of the optimal control pair is established and the Pontryagin's minimum principle is used to characterize these two optimal *** optimality system is derived and solved numerically using the forward and backward sweep method(FBSM).Our results indicate that early initiation of treatment makes a profound impact in both improving the quality of life and reducing the economic costs of therapy.

关键词： HIV Mathematical model Critical efficacy Optimal control Combined therapy

Determinants of emergency contraceptive pill use in Bangladesh: An analysis of national survey data

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Asian pacific Journal of Reproduction 2022年第2期11卷 62-69页

作者： md.rahman Mahfuzur md.Rashed Alam md Arif Billah Department of Population Science and Human Resource Development University of RajshahiRajshahi 6205Bangladesh Department of Social Work and Counselling Faculty of BusinessEconomic and Social DevelopmentUniversiti Malaysia Terengganu21030 Kuala NerusTerengganuMalaysia

Objective:To examine the determinants of emergency contraceptive pill use in ***:Data for this cross-sectional study came from 2017-2018 Bangladesh Demographic and Health *** of 906 reproductive age women who were potential candidates for using emergency contraceptive pill were analysed in this *** were analysed using univariate and multivariate *** binary logistic regression was employed as multivariate ***:Only 10.9%candidates were found to ever use emergency contraceptive *** odds of using emergency contraceptive pill for women visited by family planning field worker was significantly higher than that for those who were not visited by family planning field worker[odds ratio(OR)1.94;95%confidence interval(CI)1.19–3.17;P=0.008],while the odds of using emergency contraceptive pill for women with high socioeconomic status was higher than that for those with low socioeconomic status(OR 3.10;95%CI 1.61–5.97;P=0.001).Additionally,having some media access was linked to an increase in the odds of using emergency contraceptive pill(OR 3.01;95%CI 1.33–6.83;P=0.008).Women empowerment related factors did not show any significant effect on emergency contraceptive pill ***:The findings indicate that family planning programme has a great opportunity of playing an important role in increasing emergency contraceptive pill use in Bangladesh by increasing the knowledge and awareness of women about emergency contraceptive pill.

关键词： Emergency contraceptive pill Unintended pregnancy Abortion Bangladesh Demographic and Health Survey Bangladesh

Improvement on electrochemical performances of nanoporous titania as anode of lithium-ion batteries through annealing of pure titanium foils

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Journal of Energy Chemistry 2018年第1期27卷 250-263页

作者： md.Arafat rahman Yat Choy Wong Guangsheng Song De Ming Zhu Cuie Wen Faculty of Science Engineering and TechnologySwinburne University of Technology Department of Mechanical Engineering Chittagong University of Engineering and Technology School of Material Science&Engineering Anhui University of Technology School of Engineering RMIT University

The effect of annealing of Ti foils before anodization on the morphology and electrochemical performance of resultant nanoporous anatase TiO2 （np-TiO2） as anode in rechargeable lithium-ion batteries （LIBs） was investigated. The np-TiO2 anode fabricated from annealed Ti foils exhibited higher specific surface area and reduced pore diameter compared to np-TiO2 electrode fabricated from as-received Ti foils. The highly porous np-TiO2 anode fabricated from annealed Ti foils exhibited 1st discharge capacity of 453.25 mAh/g and reduced to 172.70 mAh/g at 1 C current rate after 300 cycles; whilst the np-TiO2 electrode fabricated from the as-received Ti foils exhibited 1st discharge capacity of 213.30 mAh/g and reduced to 160.0 mAh/g at 1 C current rate after 300cycles. Even after 400cycles, such np-TiO2 electrode exhibited a reversible capacity of 125.0 mAh/g at 2.5 C current rate. Compared to the untreated Ti foils, the enhanced electro- chemical performance of np-TiO2 anode fabricated from annealed Ti foils was ascribed to the annealing- induced removal of residual stress among the Ti atoms. The benefit of annealing process can reduce pore size of as-fabricated np-TiO2.

关键词： Annealing Nanoporous Anatase Titanium oxide Anode Lithium-ion battery

Can picnic influence floral diversity and vitality of trees in Bhawal National Park of Bangladesh?

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Forestry Studies in China 2009年第3期11卷 148-157页

作者： md. Mizanur rahman Harald VACIK Institute of Silviculture Department of Forest and Soil Sciences University of Natural Resources and Applied Life Sciences Vienna A-1190 Austria

We examined the impact of picnic activities on forest diversity, structure, regeneration and vitality of tree species in the Bhawal National Park of Bangladesh. The study area was classified as a non-used, occasionally used and frequently used area on the basis of the intensity of the picnic activities. A total of 43 plant species were enumerated in the whole study area. The highest plant species richness （41 species） was observed in the non-used area whereas the lowest species richness （11 species） in the frequently used area. The diversity index decreased with the increase of picnic intensity whereas the concentration of dominance increased. Density of all plant groups except mature trees, and the basal area of the mature trees showed a declining trend from the non-used to frequently used area. The frequently used area exhibited very poor regeneration. Tree vitality decreased with the increase of picnic intensity. The relevance of our study as a basis for further research to determine the impact of tourism on biodiversity in Bangladesh is discussed.

关键词： species richness diversity index concentration of dominance regeneration intensity

Soil resistivity and ground resistance for dry and wet soil

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Journal of Modern Power Systems and Clean Energy 2017年第2期5卷 290-297页

作者： md.Abdus SALAM Quazi Mehbubar rahman Swee Peng ANG Fushuan WEN Department of Electrical and Electronic Engineering Faculty of EngineeringUniversiti Teknologi BruneiJalan Tungku LinkBandar Seri BegawanBrunei-Muara BE1410Brunei Darussalam Department of Electrical and Computer Engineering The University of Western OntarioLondonOntario N6A 5B9Canada

In this paper, soil resistivity and ground resistance at two different sites near an electrical substation are measured using a grounding system grid with and without rods. With the Wenner four-pole equal-method, the soil resistivity is measured at both selected sites, one of which contains wet soil while the other contains dry soil. Cymgrd simulation software is then used to determine the acceptability of these measured resistivity values by finding out the root mean square error between the measured and calculated values for both wet and dry soil sites. These values for wet and dry soil sties were found to be only 0 %and 4.92 %, respectively, and deemed acceptable. The measured soil resistivity values were then used to evaluate the ground resistance values of a grounding grid ‘with rod’for the wet soil site and ‘without rods’ for the dry soil site,and then compared with the simulated ground resistance values. These comparisons were also found to be in good agreement. In addition, ground potential rise, maximum permissible step and touch potentials have also been estimated using the simulation software.

关键词： Grid with rods Grid without rods Fall-ofpotential method Soil resistivity Ground resistance

Effect of 3 mol% Yttria Stabilized Zirconia Addition on Structural and Mechanical Properties of Alumina-Zirconia Composites

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Materials Sciences and Applications 2017年第7期8卷 584-602页

作者： M. A. Gafur md. saifur rahman Sarker md. Zahangir Alam M. R. Qadir PP & PDC BCSIR Dhaka Bangladesh Department of Chemistry Kurigram Govt. College Kurigram Rangpur Bangladesh Department of ACCE Dhaka University Dhaka Bangladesh

Alumina-Zirconia (Al2O3-ZrO2) composites especially Zirconia Toughened Alumina (ZTA) shows better mechanical properties over alumina. Al2O3-ZrO2 composites were prepared by powder compaction method varying 3 mol% yttria stabilized zirconia (3Y-ZrO2) content from 0 to 20 vol% using small amount of MgO as sintering aid. The composites were sintered for two hours in air at 1580°C. At this temperature maximum density was achieved 99.31% of theoretical density for composite containing 20 vol% 3Y-ZrO2. Density measurement of sintered composites was carried out using Archimedes’s method. Hardness and fracture toughness measurement was carried out using Vickers indentation. Phase content and t-ZrO2 retention were detected by means of X-ray diffraction (XRD). Microstructure of the composites and grain size of alumina and zirconia was determined by Scanning Electron Microscopic (SEM) analysis. Maximum microhardness (17.46 GPa) was achieved for composite containing 5 vol% ZrO2 and maximum flexural strength (684.32 MPa) and fracture toughness (10.33 MPam0.5) was achieved for composite containing 20 vol% of 3Y-ZrO2. The aim of the present work is to investigate the optimum 3Y-ZrO2 content for obtaining maximum density, microhardness, flexural strength and fracture toughness of Al2O3-ZrO2 composites.

关键词： Alumina-Zirconia Composites Sintering t-ZrO2 Retention Grain Size

Contribution of non-timber forest products to the livelihoods of the forest-dependent communities around the Khadimnagar National Park in northeastern Bangladesh

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Regional Sustainability 2021年第3期2卷 280-295页

作者： md.Habibur rahman Bishwajit ROY md.Shahidul ISLAM Laboratory of Tropical Forest Resources and Environments Division of Forest and Biomaterials ScienceGraduate School of AgricultureKyoto UniversityKyoto606-8502Japan Bangladesh Institute of Social Research Trust LalmatiaDhaka1207Bangladesh Climate Change andSustainable Development Policies Faculty of ScienceUniversity of LisbonLisbon1749-016Portugal Research and Development Cell Bangladesh Knitwear Manufacturers and Exporters AssociationDhaka1000Bangladesh

Non-timber forest products(NTFPs)play a significant role in the improvement of the forest-dependent people’s livelihoodsaround the world,strengthening protection for the sustainable use of *** purpose of this research was to evaluate the influence of occupational category-wise(fuelwood collectors,farmers,small-scale businessmen,day labourers,and tea estate labourers)dependencyon NTFPsand the role of NTFPs on household income around the Khadimnagar National Park(KNP)in northeastern *** 2014,178purposively selected respondents from four villages(out of 22 villagesaround the KNP)were interviewed face-to-face using a semi-structured *** study observed that these forest-dependent communities utilized resources of the KNP mainly for domestic energy supply,household income,and house *** showed that income from NTFPs made a significant contribution to family *** data analysis indicated that small-scale businessmen earned relatively more income from NTFPs,followed by tea estate labourersand day *** study revealed significant negative relationships of the distance of households from the forest with the amount of NTFPs collected(P<0.01)and monthly income from NTFPs(P<0.01).Positive significant relationships were found between the amount of NTFPs collected and the time spent in NTFP collection(P<0.001),as well as betweenmonthly income from NTFPs and family size(P<0.001).The fuelwood collectors and farmers collected significantly greater amounts of NTFPs per trip(P<0.001)than other occupational *** households that were moderately to highly dependent on NTFPs collected significantly higher amounts of NTFPs pertrip(P<0.01)than the households that were moderately dependent and less dependent on *** dependence on KNP’sresources,community’sappreciation of the KNP’s ecosystem services for villagers’livelihoods,and community’s high levels of concern for forest conservation provided a foundation

关键词： Forest dependency Household income Non-timber forest products Forest sustainability Occupational categories Khadimnagar National Park