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Bio-inspired optimization algorithms for optical parameter extraction of dielectric materials: A comparative study

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Chinese Physics B 2016年第10期25卷 202-208页

作者： Md Ghulam Saber Kh Arif Shahriar Ashik Ahmed rakibul hasan sagor Department of Electrical and Electronic Engineering Islamic University of Technology (IUT) Department of Electrical and Electronic Engineering Northern University Bangladesh (NUB)

Particle swarm optimization(PSO) and invasive weed optimization(IWO) algorithms are used for extracting the modeling parameters of materials useful for optics and photonics research community. These two bio-inspired algorithms are used here for the first time in this particular field to the best of our knowledge. The algorithms are used for modeling graphene oxide and the performances of the two are compared. Two objective functions are used for different boundary values. Root mean square(RMS) deviation is determined and compared.

关键词： optical parameter extraction particle swarm optimization invasive weed optimization graphene oxide optimization

Extraction of optimized parameters for Si_(0.6)Ge_(0.4)material and SPP mode propagation through Si_(0.6)Ge_(0.4)/Ag/Si_(0.6)Ge_(0.4)waveguide

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Optoelectronics Letters 2013年第6期9卷 454-457页

作者： Md.Ghulam Saber rakibul hasan sagor Department of Electrical and Electronic Engineering Islamic University of Technology

The Lorentz model and modified Debye model(MDM)parameters for Si0.6Ge0.4are presented.A nonlinear optimization algorithm is *** obtained parameters are used to determine the complex relative permittivity of Si0.6Ge0.4,and compared with the experimental data for *** the obtained parameters are used to analyze the properties of symmetric surface plasmon polariton(SPP)mode propagation in a dielectric-metal-dielectric(DMD)material constructed with silver(Ag)and Si0.6Ge0.4for further verifying the extracted parameters.

关键词： SPP模式优化参数材料提取传播波导相对介电常数表面等离激元

A Comparative Study of Dispersion Characteristics Determination of a Trapezoidally Corrugated Slow Wave Structure Using Different Techniques

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Chinese Physics Letters 2016年第1期33卷 132-135页

作者： Md.Ghulam Saber rakibul hasan sagor Md.Ruhul Amin Department of Electrical and Electronic Engineering Islamic University of Technology

The linear dispersion relation of a trapezoidally corrugated slow wave structure （TCSWS） is analyzed and presented. The size parameters of the TCSWS are chosen in such a way that they operate in the x-band frequency range. The dispersion relation is solved by utilizing the Rayleigh-Fourier method by expressing the radial function in terms of the Fourier series. A highly accurate synthetic technique is also applied to determine the complete dispersion characteristics from experimentally measured resonances （cold test）. Periodic structures resonate at specific frequencies when the terminals are shorted numerical calculation, synthetic technique and cold appropriately. The dispersion characteristics obtained from test are compared, and an excellent agreement is achieved.

关键词： of on A Comparative Study of Dispersion Characteristics Determination of a Trapezoidally Corrugated Slow Wave Structure Using Different Techniques in been is

Propagation of Surface Plasmon Polariton in the Single Interface of Gallium Lanthanum Sulfide and Silver

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Photonic Sensors 2014年第1期4卷 58-62页

作者： rakibul hasan sagor Md.Ghulam Saber Md.Ruhul Amin Department of Electrical and Electronic Engineering Islamic University of TechnologyBoard BazarGazipur1704Bangladesh

surface-plasmon-polariton (SPP ) 的繁殖特征在银(Ag ) 和镓镧硫化物(图文集) 的单个接口的模式被学习了经分解并且数字地。获得的数字结果与分析的显示出一个优秀协议。沿着繁殖的方向的空间回声点的地点为电介质和金属被决定。

关键词：表面等离子体传播特性界面硫化物银镧镓数值结果

Heavily doped silicon:A potential replacement of conventional plasmonic metals

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Journal of Semiconductors 2021年第6期42卷 35-40页

作者： Md.Omar Faruque Rabiul Al Mahmud rakibul hasan sagor Islamic University of Technology(IUT) Board Bazar GazipurGazipur 1704Bangladesh

The plasmonic property of heavily doped p-type silicon is studied *** most of the plasmonic devices use metal-insulator-metal(MIM)waveguide in order to support the propagation of surface plasmon polaritons(SPPs),metals that possess a number of challenges in loss management,polarization response,nanofabrication *** the other hand,heavily doped p-type silicon shows similar plasmonic properties like metals and also enables us to overcome the challenges possessed by *** numerical simulation,heavily doped p-silicon is mathematically modeled and the theoretically obtained relative permittivity is compared with the experimental value.A waveguide is formed with the p-silicon-air interface instead of the metal-air *** and propagation of SPPs similar to MIM waveguides are observed.

关键词： alternative plasmonic material heavily doped p-silicon surface plasmon polaritons

Unsheltered: Navigating California’s Homelessness Crisis

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Journal of Sociology Study 2024年第3期14卷 143-156页

作者： rakibul hasan Md Abdullah Al Mahmud Sayeda Farjana Farabi Jahanara Akter Fatema Tuz Johora Westcliff University CaliforniaUSA International American University CaliforniaUSA

This paper presents a comprehensive exploration of the complex phenomenon of homelessness in California,with a specific focus on the state’s three largest cities-Los Angeles,San Francisco,and San *** the backdrop of a high cost of living and a housing market strained by insufficient affordable options,the multifaceted nature of social diversity further complicates the landscape,leading to a widespread presence of homelessness that spans both major urban centers and rural *** an in-depth examination of the distinct challenges confronting each city,ranging from housing shortages to intricate social dynamics,this study seeks to illuminate the underlying factors driving homelessness and identify potential avenues for ***,the paper delves into the unique vulnerabilities experienced by certain demographics within the homeless population,including veterans,families with children,and LGBTQ+individuals,highlighting the critical need for targeted solutions tailored to their specific *** synthesizing existing research and incorporating firsthand accounts,this research endeavor aims to contribute to a deeper understanding of homelessness in California and inform the development of comprehensive strategies aimed at fostering inclusive,sustainable communities statewide.

关键词： homeless California veterans children LGBTQ

Importance of Wolbachia-mediated biocontrol to reduce dengue in Bangladesh and other dengue-endemic developing countries

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Biosafety and Health 2023年第2期5卷 69-77页

作者： Abdullah Al Noman Debashish Das Zinnatun Nesa Md.Tariquzzaman Fariha Sharzana Md.rakibul hasan Baizid Khoorshid Riaz Golam Sharower Mohammad Meshbahur Rahman Department of Genetic Engineering&Biotechnology Jashore University of Science and TechnologyJashore 7408Bangladesh Directorate General of Health Services Government of the People's Republic of Bangladesh Ministry of Health and Family WelfareDhaka 1212Bangladesh Center for Medical Biotechnology Government of the People's Republic of Bangladesh Ministry of Health and Family WelfareDhaka 1212Bangladesh Department of Public Health and Hospital Administration National Institute of Preventive and Social Medicine(NIPSOM)Dhaka 1212Bangladesh Department of Entomology National Institute of Preventive and Social Medicine(NIPSOM)Dhaka 1212Bangladesh Department of Biostatistics National Institute of Preventive and Social Medicine(NIPSOM)Dhaka 1212Bangladesh

Mosquito-borne diseases,particularly dengue and chikungunya have become global threats,infecting millions of people worldwide,including developing countries of Southeast Asia and Latin ***,like many other developing countries,is experiencing frequent dengue *** article,therefore,critically discussed the current status of dengue disease,vector control approaches,and the need for Wolbachia-mediated intervention in Bangladesh and other dengue-endemic developing *** this narrative review study,rel-evant literature was searched from major databases and search engines such as PubMed,BanglaJol,World Health Organization(WHO)/European Centre for Disease Prevention and Control(ECDC)and Google *** the selection criteria,our search strategies finally involved 55 related literature for further *** showed that current vector control strategies could not render protection for an extended period,and the disease burden of arboviruses is *** impoverished outbreak preparedness,urbanization,climate change,and less efficacy of existing control methods have made people susceptible to vector-borne ***,Wolbachia,a naturally occurring endosymbiont of many mosquito species that can potentially limit virus transmission through several host genetic alterations,would be a potential alterna-tive for dengue *** also critically discussed the challenges and prospects of Wolbachia-based den-gue control in developing *** evidence supporting the efficacy and safety of this intervention and its mechanism have also been *** evidence suggests that this introgression method could be an eco-friendly and long-lasting dengue control *** review would help the policymakers and health experts devise a scheme of Wolbachia-based dengue control that can control mosquito-borne diseases,partic-ularly dengue in Bangladesh and other developing countries.

关键词： Wolbachia-based biocontrol Mosquitoes-borne diseases Dengue Biological control Developing countries

Effect of Light Intensity and pH on Cell Density Assessed by Spectrophotometry for the Unicellular Algae Chlorella vulgaris

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American Journal of Plant Sciences 2023年第4期14卷 472-481页

作者： Nishat Tasnim Debabrata Karmakar rakibul hasan Rashadul Islam Saddam Hossain Aftab Ali Shaikh Rezaul Karim Bangladesh Council of Scientific and Industrial Research Dhanmondi (BCSIR) Dhaka Bangladesh Department of Chemistry University of Dhaka Dhaka Bangladesh

In this study, an effective environment for Chlorella vulgaris growth is sought after. As a substitute source of food and feed, increasing the cell density of Chlorella culture is one of the keys to ensuring sustainability. It can be showed from different studies that optimum light intensity and pH could increase cell density. In this study, the effects of light and pH on the growth rate of C. vulgaris were observed in photobioreactor. A specific wavelength (682 nm) was determined by UV-Vis Spectrophotometry to carry out the further analysis. The light intensities were set at 7409, 9261 and 11,113 lux;pH values were set at 7, 8 and 9 respectively. The experimental results depicted the light intensity of 9261 lux as the best due to the higher number of cells (48.56 × 106 cells/mL) obtained using this intensity. In terms of pH, without pH control, cell numbers were found to be highest under the light intensity of 9261 lux. When pH was controlled, it was found that under the optimum light intensity, pH control between 7.0 and 7.5 was the optimum range for the growth of C. vulgaris. Moreover, this method of study may possibly be a promising source of low cost culture for Chlorella vulgaris.

关键词： Chlorella vulgaris Light Intensity pH Cell Density

Incidence, Mortality, and Epidemiology of Leukemia in South Asia: An Ecological Study

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Open Journal of Epidemiology 2023年第1期13卷 73-82页

作者： rakibul hasan Rifat Md. Shah Poran Saiful Islam Anika Tabassum Sumaya Md. Mozahidul Alam Md Rashedur Rahman Bangladesh Health Research Initiative Mirpur Dhaka Bangladesh Department of Pharmacy Primeasia University Banani Dhaka Bangladesh Department of Pharmacy Jahangirnagar University Savar Dhaka Bangladesh

Background: Nowadays cancer is a buzzword in every corner of the world. Back a few decades, cancer was not that much known to the people of South Asia let alone known of Leukemia. Many countries in the South Asian region are designated as developing countries. Hence, the deficiency of diagnosis system, treatment, management, and lack of knowledge about leukemia in this region are major problems. Therefore, the incidence rate, mortality rate, and several deaths are increasing day by day. Methods: This cross-sectional study is aimed to investigate the incidence and mortality of leukemia in South Asian Countries for the year 2020 by acquiring data from the global cancer project (GLOBOCAN2020) accessible at https://***. Results: In South Asia, 1,733,573 cancer cases were documented in 2020 where 62,163 cases were leukemia related. The highest incidence rate was reported in Pakistan (4.3 in 1,000,000) and Sri Lanka (4.1 in 1,000,000) and the lowest in Bangladesh (1.8 in 1,000,000) and Nepal (2.0 in 1,000,000). On the other hand, 1,124,875 death had been reported in 2020, where 45,707 (4.1%) death was associated with leukemia. Pakistan (3.4 in 1,000,000) and Maldives (3.1 in 1,000,000) had the highest death and lowest in Bangladesh (1.4 in 1,000,000) and Nepal (1.5 in 1,000,000). Adults aged from 60 - 85 years old have the highest rate of incidence and mortality rate in all countries except Nepal. Conclusions: Leukemia is one of the major concerning cancer of all ages people in South Asia, the situation and related risk factors information can be helpful to reduce death through proper treatment.

关键词： Leukemia Blood Cancer South Asia Incidence Mortality Epidemiology