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Effect of Al Doping on Structural, Electrical, Optical and Photolum.nescence Properties of Nano-Structural ZnO Thin Film.

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Journal of m.terials Science & Technology 2012年第4期28卷 329-335页

作者： m. m.zibur Rahm.n m.K.R. Khan m. Rafiqul islam m.A. Halim.m. Shahjahan m.A. Hakim.Dilip Kum.r Saha Jasim.Uddin Khan Departm.nt of Physics University of Rajshahi Rajshahi 6205 Bangladesh m.terials Science Division Atomic Energy Centre Dhaka Bangladesh Industrial Physical Division BCSIR Dhaka Bangladesh

The nano-structural Al-doped ZnO thin film. of different m.rphologies deposited on glass substrate were successfully fabricated at substrate tem.erature of 350 ℃ by an inexpensive spray pyrolysis m.thod. The structural, electrical, optical and photolum.nescence properties were investigated. X-ray diffraction study revealed the crystalline wurtzite （hexagonal） structure of the film. with nano-grains. Scanning electron m.croscopy （SEm. m.crographs indicated the form.tion of a large variety of nano-structures during film.growth. The spectral absorption of the film. occurred at the absorption edge of -410 nm. In the present study, the optical band gap energy 3.28 eV of ZnO decreased gradually to 3.05 eV for 4 m.l% of AI doping. The deep level activation energy decreased and carrier concentrations increased substantially with increasing doping. Exciting with the energy 3.543 eV （A=350 nm., a narrow and a broad characteristic photolum.nescence peaks that correspond to the near band edge （NBE） and deep level em.ssions （DLE）, respectively em.rged.

关键词： Thin film Nano-structure ZnO Surface m.rphology Photolum.nescence

Effect of Tem.erature and Ionic Concentration on Self-Assem.led Film. of Chicago Sky Blue

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Chinese Physics Letters 2008年第10期25卷 3732-3734页

作者： D. Dey m. N. islam S. A. Hussain D. Bhattacharjee Departm.nt of Physics Tripura University Suryamaninagar-799130 Tripura India

We em.loy a layer-by-layer adsorption technique for deposition on solid substrates of polyionic film. of Chicago Sky Blue. Film.growth was significant with the increasing num.er of layers. Photochem.cal properties of these film. are investigated for different ionic concentrations. A significant blue shift is observed with the increasing ionic strength of the solution, suggesting the form.tion of aggregation. Tem.erature effect studies show som. preferable reorientation of m.lecules in the film.during cooling process. m.st rem.rkable observation is that the absorption intensity is the highest for a particular degree of inclination. Deposition tim. is fixed at 15rain because adsorption kinetics results show saturation after 15 m.n.

关键词： the power-law exponents precipitation durative abrupt precipitation change

Construction of an Open Innovation Network and Its m.chanism.Design for m.nufacturing Enterprises： A Resource-Based Perspective

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Frontiers of Business Research in China 2017年第1期11卷 138-166页

作者： Haijun Wang Sardar m. N. islam Scllool of m.nagem.nt Shenyang University of Technology Shenyang 110870 China Decision Sciences and m.delling Program Victoria University Melbourne VIC 8001 Australia Victoria Institute of Strategic Econom.c Studies (VISES) Victoria University Melbourne VIC 8001 Australia

Innovation is the engine of developm.nt for enterprises, and there is an increasing trend to adopt an open innovation strategy. However, how to m.nage external resources in an open, collaborative and com.lem.ntary m.nner, and in a shared environm.nt that will yield the greatest networking effects, it is a challenging task. Because there is no such a satisfactory m.del for an open innovation strategy that com.ine operational m.chanism. with the m.nagem.nt of external resources. This article tries to fill the gap by adopting a resource-based perspective to construct an overall open innovation （OOI） business m.del. In this m.del, external resources are classified as industrial and non-industrial entities, to enable the identification of the interaction m.thods between m.nufacturing enterprises and external resources. The m.nagem.nt of external resources involved in a Technology Open Innovation （TOI） cycle is given particular attention that includes： 1） the classification of the external resources of a TOI, 2） the general m.chanism. extracted to prom.te qualified resources in and unqualified resources out, and 3） a business m.del to conceptualize the collaboration between enterprises and external resources. A case study of TOI is also provided to em.irically verify its feasibility. This paper contributes to the literature by providing an original operational m.del and m.chanism.design for an open innovation strategy that is capable of m.naging external resources effectively.

关键词： m.nufacturing enterprise open innovation resource dependence external resources m.chanism

Evaluation of Adhesive Joints for Com.ined Load Test-Fixtures

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Journal of m.chanics Engineering and Autom.tion 2013年第9期3卷 529-542页

作者： m.ham.ad m. islam Departm.nt of Engineering Science and m.chanics Virginia Polytechnic Institute and State University Blacksburg 24061 VA USA Departm.nt of Civil and Environm.ntal Engineering Princeton University Princeton 08544 N J USA

Abstract： In a test-fixture that the authors were using, steel tabs adhesively bonded to an alum.num.panel debonded before the design load on the real test panel was fully applied. Therefore, studying behavior of adhesive joints for joining dissim.lar m.terials was deem.d to be necessary. To determ.ne the failure load responsible for debonding of adhesive joints of two dissim.lar m.terials, stress distributions in adhesive joints as obtained by a nonlinear finite elem.nt m.del of the test-fixture were studied under a gradually increasing com.ression-shear load. It was observed that in-plane stresses were responsible for the debonding of the steel tabs. To achieve a better understanding of adhesive joints of dissim.lar m.terials, finite elem.nt m.dels of adhesive lap joints and ADCB （asym.etric double cantilever beam. were studied, under loadings sim.lar to the loading faced by the test-fixture. The analysis was perform.d using ABAQUS, a com.ercially available software, and the cohesive zone m.deling was used to study the debonding growth.

关键词： Cohesive m.deling delam.nation finite elem.nt analysis ADCB test-fixture.

Pre- and Post-Urban Wetland Area in Dhaka City,Bangladesh: A Rem.te Sensing and GIS Analysis

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Journal of Water Resource and Protection 2009年第6期1卷 414-421页

作者： m. Sufia SULTANA G. m. Tarekul islam Zahidul islam 不详

Landscape of Dhaka city - one of the fastest growing m.ga cities in the world, is undergoing continuous changes and m.difications due to progressive urbanization. Pre- and post-urban changes of water bodies in the city were studied using aerial photographs and SPOT im.ges in GIS environm.nt. In 1968, the total area of m.rshy and peaty inundated low-lying areas was 133 km., which was depicted to be 67 km. in the year 2001. The total area of inland lakes as estim.ted from.the aerial photos of 1968 was 5.1 km. which becam. 1.8 km. in the year 2001 as seen in SPOT im.ge. m.re than 50% of the wetland area reduced over the period 1968 to 2001. Changes of the water body m.stly occurred in the regions where m.jority of the urban expan-sion took place. The urban infrastructures filled and/or com.artm.ntalized the water bodies, causing water loggings problem.during wet-season in various part of the city. Developm.nt and alteration of the existing water bodies should consider the natural hydrological conditions so that the changes can cope with the artifi-cial intervention.

关键词： Wetland Dhaka City Bangladesh Rem.te Sensing GIS

Closed Form.Exact Solutions to the Higher Dim.nsional Fractional Schrodinger Equation via the m.dified Sim.le Equation m.thod

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Journal of Applied m.them.tics and Physics 2018年第1期6卷 90-102页

作者： m. Nurul islam m. Ali Akbar Departm.nt of m.them.tics Islamic University Kushtia Bangladesh Departm.nt of Applied m.them.tics University of Rajshahi Rajshahi Bangladesh

In this article, we investigate som. exact wave solutions to the higher dim.nsional tim.-fractional Schrodinger equation, an im.ortant equation in quantum.m.chanics. The fractional Schrodinger equation further precisely describes the quantum.state of a physical system.changes in tim.. In order to determ.ne the solutions a suitable transform.tion is considered to transm.te the equations into a sim.ler ordinary differential equation (ODE) nam.ly fractional com.lex transform.tion. We then use the m.dified sim.le equation (m.E) m.thod to obtain new and further general exact wave solutions. The m.E m.thod is m.re powerful and can be used in other works to establish com.letely new solutions for other kind of nonlinear fractional differential equations arising in m.them.tical physics. The affect of obtaining param.ters for its definite values which are exam.ned from.the solutions of two dim.nsional and three dim.nsional tim.-fractional Schrodinger equations are discussed and therefore m.ght be useful in different physical applications where the equations arise in this article.

关键词： m.dified Sim.le Equation (m.E) m.thod Fractional Differential Equation Nonlinear Evolution Equations Higher Dim.nsional Schrodinger Equation Traveling Wave Transform.tion

Introduction of a New Cycle in Replacem.nt of m.tonic: An Ideal Solution towards a Deviation Free Luni-Solar Calendar

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Open Journal of Applied Sciences 2021年第9期11卷 1060-1070页

作者： A. K. m. Am.rul islam Independent Researcher Rajshahi Bangladesh

m.lad is sim.ly an interval between two successive new m.on tim.lines with respect to the line joining the Sun and the Earth i.e., with respect to the Sun as seen from.the Earth, which in scientific term. is referred ... 详细信息

m.lad is sim.ly an interval between two successive new m.on tim.lines with respect to the line joining the Sun and the Earth i.e., with respect to the Sun as seen from the Earth, which in scientific terms is referred as lunation or “synodic lunar month”. Though synodic lunar month may vary by up to ±0.7 days locally, the length of mean synodic lunar month is constant over a long period of time and is a crucial value in determining the luni-solar calendar’s new months similar to Hebrew calendar’s “Rashei Hodesh”. Based on the Metonic cycle the luni-solar Hebrew calendar adds 07 intercalary months in 19 solar years. This hypothesis proposes a new cycle instead of the Metonic cycle towards eliminating the deviation of the calendar incurred in the long course of time. The research analyzed that application of the conventional Metonic cycle to luni-solar calendar is erroneous, which theoretically leads Hebrew calendar to absorb extra 11 days (approx.) by 2053 years after inception. The study pointed out that through the application of 2116 - 2053 lunar-solar years cycle instead of 235 m.ly:;

关键词： Luni-Solar Calendar Hebrew Calendar m.lad m.tonic Cycle Intercalary m.nth Synodic Lunar m.nth Tropical Solar Year NASA LRO

Food Functionality of Popular and Com.only Consum.d Indigenous Vegetables and Fruits from.Bangladesh

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Food and Nutrition Sciences 2013年第7期4卷 741-747页

作者： m. m. Towhidul islam Arnab Talukder Taibur Rahm.n Jahid m. m. islam Shahdat Hossain Hossain Uddin Shekhar 2Institute of Radiation and Polym.r Technology Bangladesh Atomic Energy Commission Dhaka Bangladesh Departm.nt of Biochem.stry and m.lecular Biology Faculty of Biological Sciences University of Dhaka Dhaka Bangladesh Departm.nt of Biochem.stry and m.lecular Biology Jahangirnagar University Dhaka Bangladesh.

Functional food can be either natural or processed. Food contains known biologically active com.ounds, which provides clinically proven and docum.nted health benefit. So far, no database is available in Bangladesh regarding the functionality of the indigenous foods. As a prim.ry step, this study had been conducted with an aim.to identify and characterize functionality of the indigenous foods of Bangladesh. Eight fruits and vegetables, which are very popular for their taste, price and easy availability, have been selected for in vitro screening of their functionality. High levels of fat and sugar binding capacity were observed in Pineapple (500% and 270.891% respectively). High nuplli m.rtality rate was found in cytotoxicity test with Pom.lo extract (100%), which also contained high level of vitam.n C (155 m./100g). Pom.lo contained the highest level of antioxidant am.ng all these foods (0.674 nm.l/100μl/m. protein). Red am.ranth contained highest am.unt of protein (4.31 g/100g). In stem.am.ranth, Iron level was highest (1855.67 m./kg). Total phenolics content of Water spinach and Stem.am.ranth were found higher than the other sam.les (59.339 and 55.728 m. GAE/g respectively). All these experim.nts showed these vegetables and fruits have high health im.acts and can be act as potential functional foods.

关键词： Fruits Vegetables Indigenous Foods Functional Foods Anti-Oxidants Health Benefits

Evaluating the Effectiveness of Targeted Public Health Control Strategies for Chlam.dia Transm.ssion in Om.ha, Nebraska: A m.them.tical m.deling Approach

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Advances in Infectious Diseases 2014年第3期4卷 142-151页

作者： K. m. m.nirul islam Ozgur m. Araz Departm.nt of Epidem.ology Social & Behavioral Health College of Public Health University of Nebraska Medical Center Omaha USA Departm.nt of Health Prom.tion Social & Behavioral Health College of Public Health University of Nebraska Medical Center Omaha USA

Objectives: Sexually Transm.tted Infections (STIs) have a great public health im.act globally. STIs are one of the m.st critical health problem. in the United States of Am.rica (USA). Here, we present a m.them.tical m.del for testing several interventions that are designed for various com.unities in order to control the Chlam.dia epidem.c. Study Design: Based on a com.unity sexual behavior survey, we constructed and param.terized a m.them.tical disease transm.ssion m.del to estim.te the spread dynam.cs of Chlam.dia in young adults in the northern part of Om.ha, Nebraska. m.thods: A differential equations based continuous tim. sim.lation m.del is run for various scenarios. The m.del considers only one age group i.e., 19 - 25 ages, which is considered as the highest risk group for this sexually transm.tted disease. Our m.del assum.s hom.geneous m.xing within this age group and use published estim.tes to m.del m.xing rates between individuals. Results: The presented m.del quantified the potential value of screening and treatm.nt program. for Chlam.dia in reducing the burden of disease in this specific com.unity. By increasing the screening and treatm.nt rates from.35% to 85%, great public health benefit can be achieved in two years, i.e., total cases reduction around 9% just in this considered age group. Conclusions: Com.utational results show that behavioral change based interventions on prevention have som. effect on reducing the prevalence in the targeted age group;however, m.re benefit can be obtained with frequent screening and treatm.nt program..

关键词： Chlam.dia m.them.tical m.deling Screening Public Health Policy