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Design, Simulation &Optimization of 2D Photonic Crystal Power Splitter

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Optics and Photonics Journal 2013年第2期3卷 13-19页

作者： rajib ahmed Md. Masruf Khan Rifat Ahmmed Abdul Ahad Department of Electrical & Electronic Engineering University of Information Technology & Science Dhaka Bangladesh Department of Electronics & Telecommunication Engineering Rajshahi University of Engineering & Technology Rajshahi Bangladesh Department of Physics Bangladesh University of Engineering and Technology Dhaka Bangladesh Photonic Networks Engineering (MAPNET) Scuola Superiore Sant’Anna Pisa Italy

A very compact (80 - 100 μm2) integrated power splitting devices with two outputs (1 × 2), four outputs (1 × 4) and six outputs (1 × 6) channel has been designed, simulated and optimized for Telecommunication purpose with T-Junction, Y-Junction, PC line defect waveguides integrated with multimode interference block (PCLD-MMI) and multiple line defect PC waveguides (MLDPCW) configurations. The optical modeling of these proposed structures was investigated by finite difference time domain (FDTD) simulation. With the optimization of the parameters (Hole Radius, R = 0.128 μm, Input Diameter, D = 1.02 μm, Input wavelength, λ = 1.55 μm, Substrate Reflective Index, nsub = Si(1.52), Photonic Crystal Material, npcs = InAs(3.45), and Rectangular crystal structure), 1 × 2 for Y-Junction (100%), 1 × 4 for T-Junction (92.8%) and 1 × 6 configuration for MLDPCW (81%) show maximum power transmission.

关键词： Power Splitter Photonic Crystals Finite Difference Time Domain PCLDMMI MLDPCW

Prevalence and Antimicrobial Susceptibility of Listeria spp, in Dairy Food Products and Water Samples in Dhaka, Bangladesh

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Journal of Life Sciences 2015年第4期9卷 152-158页

作者： rajib Sarker Sangita ahmed Department of Microbiology University of Dhaka Dhaka 1000 Bangladesh

A total of 57 samples, of which 17 were surface water samples and 40 were dairy food samples (raw milk, pasteurized milk, icecream, sweet, milk based drink like matha and borhani) were tested for the isolation of Listeria spp. Putative Listeria isolates were identified by conventional microbiological tests and Analytical Profile Index. Overall prevalence of Listeria spp. in both food and water samples were 8.77%, of which one was (1.75%) Listeria monocytogenes, 2 (3.5%) were Listeria innocua and 2 were (3.5%) Listeria welshimeri. When compared between two types of samples, water samples contained two Listeria spp. (11.76%) of which one was pathogenic Listeria monocytogenes and the other was Listeria innocua. In case of food samples, three Listeria spp. (7.5%) were isolated of which one was Listeria innocua (icecream sample) and two were Listeria welshimeri (icecream sample and raw milk). No Listeria was found in pasteurized milk, sweet, matha and borhani. Antibiotic resistance profile of the Listeria isolates showed that 60% isolates were resistant to Ampicillin and Erythromycin, 20% isolates were Sulphamethoxazole and Ciprofloxacin resistant. No resistance was observed to Chloramphenicol for any Listeria isolates.

关键词：食品样品李斯特菌水样品孟加拉国李斯特氏菌磺胺甲基异恶唑巴氏杀菌奶药敏

美国RheoSense芯片上的粘度计/流变仪及其在石油化工领域内的应用

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美国RheoSense芯片上的粘度计/流变仪及其在石油化工领域内的应用

In Silico Screening of Natural Products as Potential Inhibitors of SARS-CoV-2 Using Molecular Docking Simulation

BCEIA2013分析仪器应用技术报告会

作者： Ivan Akhremitchev rajib ahmed Seong-gi Baek Ying-Chih Wang RheoSense Inc.

Viscosity is a key component in the analysis of many chemical and biological substances. It is also essential for all plants that manufacture or process liquid matter to understand and control viscosity properly. A novel microfluidic viscometer with unprecedented dynamic range and small sample requirement is presented. RheoS ense viscometers use patented VROC(Viscometer/Rheometer On-a-Chip) microfluidic sensor technology to measure viscosity from the pressure drop of a test liquid as it flows through a rectangular slit1. The novel VROC technology invented at RheoS ense requires less than 20 μL of sample to conduct one measurement and has proven itself a versatile and robust platform for many industrial applications, including rechargeable batteries, proteins, small molecule drugs, high molecular weight polymers, inks, and lubricants. With its small footprint and sample volume requirement, VROC instruments are also indispensable tools for researchers who wish to study the rheological properties of biological and other clinical samples outside a laboratory environment. The flow channel design provides significant advantages in attaining accurate viscosity measurements of small sample volumes at extremely high shear rates;these properties allow it to accurately mimic lubrication, high speed coating, and inkjet printing processes.

关键词：粘度计流变仪微量样品微流体传感器非牛顿流体便携式

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Chinese Journal of Integrative Medicine 2022年第3期28卷 249-256页

作者： rajib Hossain Chandan Sarkar Shardar Mohammad Hafiz Hassan Rasel ahmed Khan Mohammad Arman Pranta Ray Muhammad Torequl Islam Sevgi Durna Dastan Javad Sharifi-Rad Zainab M. Almarhoon Miquel Martorell William N. Setzer Daniela Calina Department of Pharmacy Life Science FacultyBangabandhu Sheikh Mujibur Rahman Science and Technology UniversityGopalganj(8100)Bangladesh Harmacy Discipline Life Science SchoolKhulna UniversityKhulna-9280Bangladesh Departme nt of Pharmacy In ternational Islamic UniversityChittagongBangladesh Department of Biomedical Engin eeri ng Huazho ng Un iversity of Science and Tech no logyWuhan(430074)China Department of Biology Faculty of ScienceSivas Cumhuriyet UniversitySivas(58140)Turkey Beekeeping Development Application and Research Center Sivas Cumhuriyet UniversitySivas(58140)Turkey School of Medicine University of AzuayCuencaEcuador Department of Chemistry College of ScienceKing Saud UniversityRiyadh(11451)Saudi Arabia Department of Nutrition and Dietetics Faculty of Pharmacyand Centre for Healthy LivingUniversity of ConcepcionConcepcion(4070386)Chile Department of Chemistry University of Alabama in HuntsvilleHuntsvilleAL(35899)USA Aromatic Plant Research Center 230 N 1200 ESuite 100LehiUT(84043)USA Department of Clinical Pharmacy University of Medicine and Pharmacy of CraiovaCraiova(200349)Romania

Objective:To explore potential natural products against severe acute respiratory syndrome coronavirus(SARS-CoV-2)via the study of structural and non-structural proteins of human ***:In this study,we performed an in-silico survey of 25 potential natural compounds acting against *** docking studies were carried out using compounds against 3-chymotrypsin-like protease(3 CL^(PHO)),papain-like protease(PL^(PRO)),RNA-dependent RNA polymerase(RdRp),non-structural protein(nsp),human angiotensin converting enzyme 2 receptor(hACE2 R),sapike glycoprotein(S protein),abelson murine leukemia viral oncogene homolog 1(ABL1),calcineurin-nuclear factor of activated T-cells(NFAT)and transmembrane protease serine ***:Among the screened compounds,amentoflavone showed the best binding affinity with the 3 CL^(PRO),RdRp,nsp13,nsp15,hACE2 R,ABL1 and calcineurin-NFAT;berbamine with hACE2 R and ABL1;cepharanthine with nsp10,nsp14,nsp16,S protein and ABL1;glucogallin with nsp15;and papyriflavonol A with PL^(PRO)*** good interacting compounds were juglanin,betulinic acid,betulonic acid,broussooflavan A,tomentin A,B and E,7-methoxycryptopleurine,aloe emodin,quercetin,tanshinone I,tylophorine and furruginol,which also showed excellent binding affinity towards a number of target *** of these compounds showed better binding affinities towards the target proteins than the standard drugs used in this ***:Natural products or their derivatives may be one of the potential targets to fight against SARS-CoV-2.

关键词： SARS-CoV-2 natural products-derived anti-SARS-CoV-2 candidates structural proteins nonstructural proteins molecular docking

Complete Garment Costing with Major Cost Breakdown

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Journal of Textile Science and Technology 2023年第2期9卷 115-126页

作者： Md. Monirul Islam rajib Md. Mehedi Hasan Parvez Md. Shofiul Islam Tanveer ahmed Md. Rashedul Islam Department of Apparel Manufacturing & Technology BGMEA University of Fashion & Technology (BUFT) Dhaka Bangladesh

Apparel business is one of the oldest global businesses. Emergence of different apparel manufacturing nations, rapid development of global supply chains and increasingly higher demand for fast fashion items are exposing the apparel manufacturers to competitive product prices. Alongside, the persistent global depression has also forced the apparel business to curtail the prices to remain sustainable in the industry. Garment costing is the systematic process of meticulously calculating the total cost of a certain quantity of garments from raw material purchase to converting them to the final products, plus other terms and conditions stated by the customers. The sum of these costs adding the profit margin is the selling price. This research outlines the process of preparing cost sheets for basic garment products. The research proposes a clear method of generating easily understandable, complete garment cost sheets for the apparel industry.

关键词： Apparel Costing Shirt Trousers T-Shirt

A multi-purpose National Forest Inventory in Bangladesh:design,operationalisation and key results

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Forest Ecosystems 2021年第1期8卷 151-172页

作者： Matieu Henry Zaheer Iqbal Kristofer Johnson Mariam Akhter Liam Costello Charles Scott Rashed Jalal Md.Akhter Hossain Nikhil Chakma Olaf Kuegler Hossain Mahmood rajib Mahamud Mohammad Raqibul Hasan Siddique Khaled Misbahuzzaman Mohammad Main Uddin Mohammed Al Amin Farid Uddin ahmed Gael Sola Md.Baktiar Siddiqui Luca Birigazzi Mahmudur Rahman Ilias Animon Saimunnahar Ritu Laskar Muqsudur Rahman Aminul Islam Heather Hayden Frida Sidik Mondal Falgoonee Kumar Rakibul Hassan Mukul Hossain Nishad Ariful Hoque Belal Asif Reza Anik Abdul Khaleque Md.Shaheduzzaman Syed Shahadat Hossain Tariq Aziz Md.Tauhidor Rahaman Ruhul Mohaiman Patrick Meyer Purnata Chakma A.Z.M.Manzoor Rashid Sourav Das Shrabanti Hira Mohammed Jashimuddin Mohammad Mahfuzur Rahman Karl Wurster Sarder Nasir Uddin Abul Kalam Azad S.M.Zahirul Islam Laurent Saint-André Food and Agriculture Organization of the United Nations Viale delle Terme di Caracalla00153 RomeItaly Forest Department Ministry of EnvironmentForests and Climate ChangeBan BhabanShere Bangla NagarAgargaonDhaka 1207Bangladesh School of Ecosystem and Forest Sciences University of MelbourneParkville VictoriaMelbourne 3010Australia United States Forest Service(USFS)/SilvaCarbon WashingtonD.CUSA Institute of Forestry and Environmental Sciences(IFES) University of ChittagongChattogramBangladesh Department of Forestry and Environmental Science Rangamati Science and Technology UniversityRangamatiBangladesh Forestry and Wood Technology Discipline Khulna UniversityKhulnaBangladesh School of Biological Sciences The University of QueenslandQLDBrisbane 4072Australia Arannyak Foundation DhakaBangladesh United Nations Framework Convention on Climate Change(UNFCCC) BonnGermany Bangladesh Space Research and Remote Sensing Organization(SPARRSO) DhakaBangladesh Institute for Marine Research and Observation Ministry of Marine Affairs and FisheriesNegaraBaliIndonesia Department of Agricultural Economics Bangabandhu Sheikh Mujibur Rahman Agricultural University(BSMRAU)GazipurBangladesh Bangladesh Bureau of Statistics(BBS) DhakaBangladesh Institute of Statistical Research and Training University of DhakaDhakaBangladesh United States Agency for International Development(USAID) DhakaBangladesh Department of Forestry and Environmental Science Shahjalal University of Science and TechnologyKumargaonSylhetBangladesh Department of Biological Sciences Faculty of Science and EngineeringMacquarie UniversitySydneyAustralia Bangladesh National Herbarium(BNH) Zoo RoadMirpurDhakaBangladesh Bangladesh Forest Research Institute(BFRI) SholoshaharChottogramBangladesh National Research Institute for Agriculture Food and Environment(INRAE)ParisFrance

Background:National forest inventory and forest monitoring systems are more important than ever considering continued global degradation of trees and *** systems are especially important in a country like Bangladesh,which is characterised by a large population density,climate change vulnerability and dependence on natural *** the aim of supporting the Government’s actions towards sustainable forest management through reliable information,the Bangladesh Forest Inventory(BFI)was designed and implemented through three components:biophysical inventory,socio-economic survey and remote sensing-based land cover *** article documents the approach undertaken by the Forest Department under the Ministry of Environment,Forests and Climate Change to establish the BFI as a multipurpose,efficient,accurate and replicable national forest *** design,operationalization and some key results of the process are ***:The BFI takes advantage of the latest and most well-accepted technological and methodological ***,it was designed through a collaborative process which drew from the experience and knowledge of multiple national and international ***,1781 field plots were visited,6400 households were surveyed,and a national land cover map for the year 2015 was *** technological enhancements include a semi-automated segmentation approach for developing the wall-to-wall land cover map,an object-based national land characterisation system,consistent estimates between sample-based and mapped land cover areas,use of mobile apps for tree species identification and data collection,and use of differential global positioning system for referencing plot ***:Seven criteria,and multiple associated indicators,were developed for monitoring progress towards sustainable forest management goals,informing management decisions,and national and international reporting needs.A wide range of biophysica

关键词： South-Asia Forest monitoring Innovation Remote sensing Socio-economic Partnership Ecosystem services Carbon sequestration