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An Overview of Bangladeshi Shipbuilding in the Light of Competitive Parameters

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Journal of Shipping and Ocean Engineering 2011年第1期1卷 8-19页

作者： N.M.G. Zakaria M.T. Ali K.A. hossain department of Naval Architecture and Marine Engineering Bangladesh University of Engineering and Technology Dhaka 1000Bangladesh

Shipbuilding in Bangladesh has been considered as the most promising industry in the recent time and the country is dreaming to emerge as a middle income country within a short time by maintaining the upward trend of this sector. However, due to global nature and the long term sustainability of this shipbuilding industry, an investigation of competitiveness in terms of global standard is of prime importance. This paper focuses on studying some crucial competitive factors like labor skill, labor availability, labor man-hour, labor cost ＆ productivity for local shipbuilding in Bangladesh. The analysis also focuses on existing access to the resources like materials, knowledge and capital which are equally important factors for the expansion of shipbuilding. Comparison of these parameters with other nations have been made qualitatively and quantitatively to find the level of our shipbuilding. On the basis of existing condition and future vision, some recommendations have been made which might be useful for accelerating the development of this sector.

关键词： Shipbuilding competitive factor productivity R&d labor cost.

Effects of Hall Current and Ohmic Heating on Non-Newtonian Fluid Flow in a Channel due to Peristaltic Wave

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Applied Mathematics 2020年第4期11卷 292-306页

作者： Md. Maruf Hasan Md. Abdus Samad Md. Mubarak hossain department of Mathematics Comilla University Cumilla Bangladesh department of Applied Mathematics University of Dhaka Dhaka Bangladesh

In this paper, the study of non-Newtonian fluid flow with heat transfer in a porous asymmetric channel due to peristaltic wave was taken out. Hall current and Ohmic heating effects were introduced in the present study. A Casson non-Newtonian constitutive model was employed for the transport of fluid. Analytical solutions were obtained for stream function, temperature and heat transfer coefficient. The coupled nonlinear equations have also been solved numerically using MATLAB software (by bvp4c function). The influences of many evolving parameters on the flow characteristic have been explained with the help of 2d and 3d plots. Again the obtained results were compared with the results available in the literature and were found in good agreement.

关键词： Ohmic Heating Non-Newtonian Fluid Temperature Field

Copper and Mercury in Food, Biological and Pharmaceutical Samples: Spectrophotometric Estimation as Cu(ddTC)<sub>2</sub>

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American Journal of Analytical Chemistry 2014年第13期5卷 838-850页

作者： Mohammad Nasir Uddin Nur Mostaq Shah Mohammad Amzad hossain Md. Muzahidul Islam department of Chemistry University of Chittagong Chittagong Bangladesh

An alternative spectrophotometric method was optimized and validated for the estimation of mercury using diethyldithiocarbamate (ddTC), a common reagent, widely used for the preconcentration and isolation of metal ions in complex matrices followed by their estimation by varied techniques. diethyldithiocarbamate forms yellow Cu(ddTC)2 with copper and white Hg(ddTC)2 with mercury (having d10 system) which are extracted in CCl4. The UV-visible spectrum of Cu(ddTC)2 is very stable at pH 5.0 and has a maximum absorption (λmax) at 435 nm. Hg(ddTC)2 is more stable than Cu(ddTC)2. Estimation of mercury is based on a quantitative displacement of Cu(II) of Cu(ddTC)2 with the addition of mercury followed by the measurement of reduced absorbance. Primarily, method was optimized and validated for the estimation of copper. Therefore, simultaneous determination of Cu(II) and Hg(II) in mixture is proposed fractionating the extract. The molar specific coefficient (ε) for the mercury was 1.4 × 104 mol﹣1·L·cm﹣1 and for copper was 3.16 × 105 mol﹣1·L·cm﹣1 at 435 nm. The detection limits of Cu2+ and Hg2+ were 0.023 μg·mL﹣1 and 0.029 μg·mL﹣1, respectively. The calibration curve shows good linearity of 0.02 - 12.0 and 0.02 - 15.0 μg·mL﹣1 for the Cu2+ and Hg2+ determination, respectively. Proposed technique was applied to food, biological and pharmaceutical samples for the determination of Cu(II) and Hg(II).

关键词： Copper Mercury diethyldithiocarbamate Spectrophotometric Method Food Biological Pharmaceutical Samples

Confirmation of the Experimentally-Proven Therapeutic Utility of Madecassoside in an Aβ<sub>1-42</sub>Infusion Rat Model of Alzheimer’s disease by in Silico Analyses

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Advances in Alzheimer's disease 2015年第2期4卷 37-44页

作者： Abdullah Al Mamun Michio Hashimoto Shahdat hossain Masanori Katakura Hiroyuki Arai Osamu Shido department of Environmental Physiology Shimane University Faculty of Medicine Izumoshi Japan Laboratory of Alternative Medicine and Behavioral Neurosciences Department of Biochemistry and Molecular Biology Jahangirnagar University Dhaka Bangladesh department of Geriatrics and Gerontology Division of Brain Sciences Institute of Development Aging and Cancer Tohoku University Sendai Japan

The accumulation of amyloid β peptide 1 - 42 (Aβ1-42) in the brain of Alzheimer’s disease (Ad) patients is known to be associated with neurodegeneration and memory impairment. More recently, we reported that madecassoside, an active component of Centella asiatica, improved memory impairment in an Aβ1-42 infusion rat model of Ad, ameliorated neurotoxicity in SH-SY5Y cells, and inhibited in vitro Aβ1-42 fibril formation. In the present study, we investigated the utility of in silico analyses in corroborating observed in vivo and in vitro effects of madecassoside in Ad to further assess the therapeutic benefits of madecassoside. The 3d structure of Aβ1-42 was downloaded from the Research Collaboratory for Structural Bioinformatics (RCSB) Protein data Bank (PdB). The binding of madecassoside to Aβ1-42 was assessed by molecular docking. The chemical structure of madecassoside was modeled and converted to the PdB format. Madecassoside was found to successfully dock with Aβ1-42. Computational demonstration of the binding of madecassoside to Aβ1-42 further corroborated the inhibitory effect of madecassoside on Aβ1-42 fibrillogenesis which was demonstrated in our previous study. These data showed the potential utility of madecassoside as a preventive medication in Aβ1-42-induced neurodegenerative diseases such as Ad.

关键词： Alzheimer’s disease Centella asiatica Madecassoside Ayurveda in Silico drug designing

Endoscopic treatment modalities and outcomes in nonvariceal upper gastrointestinal bleeding

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World Journal of Gastrointestinal Endoscopy 2020年第2期12卷 72-82页

作者： Benjamin Cherng Hann Yip hossain Sayeed Sajjad Jie-Xun Wang Constantinos P Anastassiades department of General Medicine Khoo Teck Puat HospitalSingapore 768828Singapore department of Acute Medicine Northampton General HospitalCliftonvilleNorthampton NN15BDUnited Kingdom Clinical Research Unit Khoo Teck Puat HospitalSingapore 768828Singapore

BACKGROUNd In nonvariceal upper gastrointestinal bleeding(NVUGIB),the optimal volume of adrenaline,the optimal number of hemoclips,and the application of thermal coagulation in determining patient outcomes have not been well *** To demonstrate a dose-response relationship between the commonly used endoscopic modalities for the treatment of non-variceal upper gastrointestinal bleeding and various clinical *** Patients presenting with NVUGIB were retrospectively identified and *** patients were stratified as follows:(1)>10 mL of adrenaline injected vs≤10 mL;(2)>1 hemoclip placed vs≤1 hemoclip;(3)Heater probe used or not;and(4)>2 treatment modalities used vs≤*** primary outcomes were rebleeding and the need for repeat *** secondary outcomes were the need for surgery,required transfusions,length of hospital stay,death during the same admission period and 30 d *** with NVUGIB who required endoscopic therapy were *** who did not require endoscopic therapy or were initially treated with surgery or embolization were *** In all,501 patients with NVUGIB were *** hundred sixty-one(32.1%)patients needed endoscopic *** injection ofdrenaline was associated with less rebleeding(Pd for repeat endoscopy(P=0.001)and a decreased length of hospital stay(P=0.026).The use of>2 treatment modalities were associated with increased rebleeding(P=0.009)and the need for repeat endoscopy(P=0.048).The placement of>1 hemoclip was associated with a decreased length of hospital stay(P=0.044).The rates of surgery and death were low,and there were no other significant differences between the patient *** The more restrictive use of adrenaline and number of endoscopic modalities to treat NVUGIB with the more liberal use of hemoclips was associated with better patient outcomes.

关键词： Outcome predictors Nonvariceal upper gastrointestinal bleeding

A Comparative Analysis of Culture Media for Optimizing the Mycelial Growth and Sporulation of Stemphylium vesicarium Cause of White Blotch of Onion

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Journal of Agricultural Science and Technology(A) 2015年第6期5卷 440-448页

作者： Hosna Ara Chowdhury Nurul Islam Belal hossain Moudood Ahmed Sayed Mohsin Rafiqul Islam department of Plant Pathology Sher-e-Bangla Agricultural University Dhaka 1207 Bangladesh department of Botany University of Dhaka Dhaka 1000 Bangladesh

This study was conducted to identify a cheap and suitable culture medium for the mycelial growth and sporulation of Sternphylium vesicarium and to determine the cultural and morphological variability of this pathogen. A total of 24 isolates of S. vesicarium collected from eight different onion growing areas were characterized in terms of cultural and morphological aspects. Front colony colors were greenish brown to dirty white, deep grey to whitish, light grey to whitish, deep greenish white, light grey and dirty white to greenish. Reverse colony colors were brown, deep brown and light brown. Colony shapes were circular and irregular with umbonate, raised and flat type colony elevation. Colony textures were cottony, fluffy and velvety with entire, undulate and filiform type colony margin. Among the culture media, V-7 juice agar found to be the most suitable culture media for mycclial growth of S. vesicarium. The sporulation of the fungus was remarkably influenced by V-7 juice mixed with potato dextrose agar （PdA） media, this media exhibited the highest sporulation （87.76-169.0/mm^2） of S. vesicariumin comparison with other media. The minimum days （28 d to 31 d） for conidial production were observed on V-7 juice agar medium. The length of conidia varied from 14.6 μm to 30.6 μm. The maximum mean length of conidia was 29.97 μm found in isolate dSSA, while the minimum mean length 17.36 μm was found in isolate MSMM 02. The breadth of conidia ranged from 4.7 μm to 15.7μm. The maximum mean breadth of conidia was 12.55 μm found in the isolate dSSA, while the minimum mean breadth 9.760 μm was found in the isolate CCKH 02. The horizontal septation varied from l to 3 and the longitudinal septation varied from 0 to 4.

关键词： Onion white blotch S. vesicarium V-7 juice agar.

工件固定方式对振动式滚磨光整加工效果影响的实验研究

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机械设计与制造 2022年第3期373卷 7-14页

作者：姚强 Md Ahmed Sanuar hossain 李秀红白小云太原理工大学机械工程学院山西太原030024 精密加工山西省重点实验室山西太原030024

目的为了探索卧式振动滚磨光整加工中加工规律,寻找最优加工位置,以满足实际加工需求,提高零件表面完整性。方法在两种固定方式下,将工件置于不同深度、不同水平位置,测试加工后工件表面粗糙度,对比两种固定方式加工效果,并用曲线拟合... 详细信息

目的为了探索卧式振动滚磨光整加工中加工规律,寻找最优加工位置,以满足实际加工需求,提高零件表面完整性。方法在两种固定方式下,将工件置于不同深度、不同水平位置,测试加工后工件表面粗糙度,对比两种固定方式加工效果,并用曲线拟合找出最优加工位置。结论工件在两种固定方式下,工件各区域加工后表面粗糙度随着深度的增加先下降再上升后降低,随着与左桶壁水平位置距离的增加先下降后上升。在内固定方式下,工件表面粗糙度下降速率明显快于外固定,工件能达到的极限表面粗糙度值是外固定方式下的(0.4~0.5)倍,且工件加工后不均匀性弱于外固定。通过深度、水平位置的曲线拟合及实验验证,工件的最优加工位置为:埋入深度220mm,距左桶壁275mm。

关键词：滚磨光整加工工件固定方式:表面粗糙度最优加工位置

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36Ar（n,p）36Cl截面测量

科学通报 1989年第15期34卷 1199-1200页

作者：蒋崧生,T.K.Hemmick,P.W.Kubik,d.Elmore,H.E.Gove,S.Tullui,T.Z.hossain 中国原子能科学研究院美国Rochester大学校结构实验室美国Rochester大学校结构实验室美国Rochester大学校结构实验室美国Rochester大学校结构实验室美国Rochester大学校结构实验室美国Esstman Kodak公司研究实验室分析技术部北京

研究自然界36Cl的形成在地球科学有重要意义。宇宙线中子在大气层通过36Ar（n,p）36Cl反应生成36Cl在当今被认为自然界36Cl的主要来源之一。1968年（Onufrier）曾假设慢中子引起36Ar（n,p）36Cl反应的截面与14N（n,p）14C截面（热中子... 详细信息

研究自然界36Cl的形成在地球科学有重要意义。宇宙线中子在大气层通过36Ar（n,p）36Cl反应生成36Cl在当今被认为自然界36Cl的主要来源之一。1968年（Onufrier）曾假设慢中子引起36Ar（n,p）36Cl反应的截面与14N（n,p）14C截面（热中子截面为1.8b）具有相同的数量级,由此计

关键词：反应 n,p Ar Cl

High Prevalence of Vitamin d deficiency among Bangladeshi Children: An Emerging Public Health Problem

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Health 2017年第12期9卷 1680-1688页

作者： Sanjana Zaman Mohammad delwer hossain Hawlader Animesh Biswas Mahmudul Hasan Mobashera Jahan Gias U Ahsan department of Public Health North South University Dhaka Bangladesh Center for Injury Prevention and Research Dhaka Bangladesh

Background: Recent studies suggested that vitamin d deficiency among children is widespread worldwide. Most of the Asian countries are suffering from high prevalence of vitamin d deficiency, especially in children. However, the vitamin d deficiency of Bangladeshi children has not been investigated yet. The objective of the study was to assess the prevalence of vitamin d deficiency among children in dhaka city, Bangladesh. Methods: A cross-sectional study was designed. Children aged 0 month to 16 years attended Pediatrics’ clinics with minor illness were conveniently recruited. After obtaining informed written consent, venous blood was taken and serum 25(OH)d levels were determined by direct enzyme-linked immunosorbent assay. descriptive statistics were performed for age, sex, biochemical parameters. Socio-economic status (SES) was estimated using a wealth index, producing a weighted score. Scores were categorized into quintiles, with category 1 representing the poorest and category 5 the richest. Serum 25(OH)d was categorized: deficient as Results: 31.88% children of 0 - 1 year had deficient serum 25(OH)d level and 52.17% children had insufficient level. Among 2 - 5 years’ group, 38.16% were deficient and 50% were insufficient. Among the 6 - 11 years group, 41.02% were deficient and 52.56% were insufficient. Among 12 - 16 years group, 46.75% were deficient and 51.95% were insufficient. That means, serum 25-hydroxyvitamin d deficiency and insufficiency rate is found very high among Bangladeshi children. Conclusions: The prevalence of vitamin d deficiency and insufficiency among children in Bangladesh is high. The study recommended that vitamin d supplementation in Bangladeshi children should be formally launched from first day of birth up to adolescence.

关键词： Prevalence Serum 25(OH)d Vitamin d Children deficiency Bangladesh