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Overcoming Challenges in COVID-19 Vaccination among Ethnic Minority Groups in Bangladesh: A Qualitative Exploration

World Journal of Vaccines 2024年第2期14卷 25-42页

作者： Esmat Ara md. Assraf Seddiky abdul Basit md. Habibullah Balaly Department of Public Administration Shahjalal University of Science & Technology Sylhet Bangladesh Department of Politics and Governance Gono Bishwabidyalay Savar Dhaka Bangladesh

This study aimed to explore the barriers affecting COVID-19 vaccine uptake among ethnic minorities and to propose strategies to strengthen government initiatives for inclusive vaccination. Grounded in social constructivism, this qualitative study was conducted in the greater Sylhet Division, where many ethnic communities live. Using purposive sampling, semi-structured interviews were conducted with 49 participants, including ethnic men and women, community leaders, and healthcare providers. Two focus group discussions (FGDs) were also conducted to ensure data validation, and the results were analyzed using thematic analysis, which revealed several factors, such as free vaccinations, media, close community-knit healthcare centers, informal communication that positively influenced vaccine uptake, such as awareness campaigns, informal communication, media involvement, and free vaccine availability. However, socio-economic and technological barriers pose significant challenges, including misconceptions about vaccines, limited access to technology, long distances to vaccination centers, inconvenient service hours, and reliance on traditional medicine. To promote inclusive vaccination, the study recommends establishing localized vaccine camps, improving technological infrastructure such as the Internet and network access, enhancing communication strategies, providing special services for women, the elderly and disabled individuals, and ensuring a reliable vaccine supply. Future researchers could apply longitudinal studies, including a lager study area and broader range of participants to address the missing perspectives in the current study.

关键词： Ethnic Minority Healthcare COVID-19 Vaccine Uptake Inclusive Vaccination Strategies Bangladesh

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Leaf Water Status and Its Relationship with Reproductive Responses of Common Bean (<i>Phaseolus vulgaris</i>L.) Genotypes under Water Stress

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American Journal of Plant Sciences 2014年第11期5卷 1547-1556页

作者： Apurba Kanti Choudhury md.abdul Karim md Moynul Haque Qazi abdul Khaliq Jalal Uddin Ahmed Mohammad Mofazzal Hossain Department of Agronomy Bangabandhu Sheikh Mujibur Rahman Agricultural University Gazipur Bangladesh Department of Crop Botany Bangabandhu Sheikh Mujibur Rahman Agricultural University Gazipur Bangladesh Department of Horticulture Bangabandhu Sheikh Mujibur Rahman Agricultural University Gazipur Bangladesh On-Farm Research Division Bangladesh Agricultural Research Institute Joydebpur Bangladesh

Two tolerant (BB24 and BB43) and two susceptible (BARI busbean-2 and BB04) genotypes of common bean (Phaseolus vulgaris L.) were evaluated for their water status and its relationship with reproductive responses under continuous water stress (50% field capacity) and control (80% field capacity) conditions in a net house covered with polyethylene sheet at the Bangabandhu Sheikh Mujibur Rahman Agricultural University, Bangladesh. Under water stress condition, the susceptible genotype namely BB04 exhibited more negative leaf water potential (LWP) which was followed by that of BARI bushbean-2 in all the time of the day except at noon. The tolerant genotype namely BB24 exhibited less negative LWP at noon. The tolerant genotypes maintained higher relative water content (WRC) than the susceptible ones from dawn to dusk. The relationship between RWC and LWP was examined separately for four genotypes under water stress condition. The genotype BB24 showed a smaller decrease in RWC with more negative LWP than BB04. Water stress reduced pod setting ratio. The relationship between the leaf water status and reproductive responses showed that the genotype with a little reduction in mid-day drop of RWC or with high mid-day RWC displayed a high pod setting ratio.

关键词： Leaf Water Potential Pod Setting Ratio Relative Water Content

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Interference Cancellation with an Achievable Angular Channel Model Based on Coordinate Multi-Point

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通讯和计算机（中英文版） 2013年第3期10卷 301-308页

作者： md. abdul Latif Sarker Moon Ho Lee College of Engineering Chonbuk National University of Electronic& Information Engineering Jeonju City 561-756 Korea

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Optimized Design and Analysis of Single-Phase and Three-Phase Inverters for Efficient Power Conversion: A Comparative Study

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Journal of Computer and Communications 2023年第8期11卷 71-95页

作者： Ashik Alam md. abdul Monem Kazi Khairul Islam Department of Electrical and Electronic Engineering Bangladesh Army University of Engineering and Technology (BAUET) Natore Bangladesh Department of Mechanical Engineering Bangladesh Army University of Engineering and Technology (BAUET) Natore Bangladesh

A large amount of switching loss occurs in the inverter. From this point of view, an inverter design should be optimized for which size and cost will be minimum along with increasing efficiency. The main aim of this paper is the analysis and development of single-phase and three-phase inverter to design with MOSFET and IGBT as power elements by sinusoidal pulse width modulation (SPWM) technique using MATLAB Simulink software and compare their difference with the practical inverter. This work proposes different multilevel stages for the cascaded H-Bridge inverter to enhance the output voltages. Then compare their performance, harmonic distortion, and frequency spectrum. The hardware of an inverter circuit has been developed using the SG3524 microcontroller. The main goal of this design is to generate a sine wave with fewer harmonics, while keeping the cost and complexity of the circuit low. The designed inverter has undergone testing with different AC loads and is primarily intended for low-power applications, as lamps, fans, and chargers. This design aims to provide a reliable and efficient inverter solution for these specific applications.

关键词： Harmonic Distortion (HD) Pulse Width Modulation (PWM) Sine Pulse Width Modulation (SPWM) Total Harmonic Distortion (THD) Laboratory (LAB)

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Photocatalytic Degradation of Oxytetracycline Dihydrate from Aqueous Solution Using Nano ZnO and ***3 (x = 3%, 18%, 33% and 48%)

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Materials Sciences and Applications 2023年第12期14卷 515-525页

作者： Preyanty Sen Suraya Sabrin Soshi md. abdul Gafur Department of Applied Chemistry and Chemical Engineering University of Dhaka Dhaka Bangladesh Department of Mechanical Engineering Ahsanullah University of Science and Technology Dhaka Bangladesh Bangladesh Council of Scientific and Industrial Research (BCSIR) Dhaka Bangladesh

Traditional wastewater mostly contains pharmaceutical ingredients. Therefore, the wastewater must be completely free from antibiotics before its release into the environment. In the present study, photocatalytic degradation was done to investigate the removal efficiency of Oxytetracycline Dihydrate (OTC) using ZnO, ZnO/3%BaTiO3 (3 BZ), ZnO/18%BaTiO3 (18 BZ), ZnO/ 33%BaTiO3 (33 BZ) and ZnO/48%BaTiO3 (48 BZ) under UV light. After the exposure time of 420 min, about 99.57% and 97.87% of OTC was degraded using ZnO and 3 BZ respectively. Further, increasing the amount of BaTiO3 in ZnO prolongs the degradation time. Therefore, faster efficiency was found using ZnO nanoparticles. The observed reaction rate constant using ZnO was 0.00933 min-1 which decreased to 0.00532 min-1 using 48 BZ, indicating the decrease of reaction rate for increasing the amount of BaTiO3. Hence, the use of ZnO photocatalyst is anticipated to be a promising technique for the photocatalytic degradation of contaminated wastewater with oxytetracycline antibiotics using UV light.

关键词： Advanced Oxidation Process (AOP) Antibiotics Zinc Oxide (ZnO) and Barium Titanate (BaTiO3)

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Development and Characterization of Hybrid Film Made of Hydroxyapatite, Poly Vinyl Alcohol and Gelatin for Biomedical Application

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Materials Sciences and Applications 2024年第9期15卷 320-335页

作者： Farzana Rashid Suraya Sabrin Soshi md. abdul Gafur Department of Medicine Hallym University Chuncheon-si South Korea Department of MPE AUST Dhaka Bangladesh PP&PDC Bangladesh Council of Scientific and Industrial Research Dhaka Bangladesh

In the recent research field of bone tissue engineering, polymeric materials play an implacable role in mimes the natural behavior of hard and soft tissues. In some medical conditions such as diabetics, osteoarthritis, burns, or joint replacement conditions, this polymeric materials implication enhances the internal mechanical activities which result in the early recovery of disease by facilitating the wound healing process. In this study, hybrid films have been synthesized based on polyvinyl alcohol (PVA), gelatin, and gelatin with glycerin incorporated with different concentrations of pre-prepared hydroxyapatite (HAP) by solution casting method at room temperature in biosafety cabinet. Glutaraldehyde has been added as a crosslinker in this whole procedure. The mechanical property, swelling, and porosity percentage have been conducted to characterize the structural stability of the synthesized hybrid films. Porosity and swelling of samples are also represented by proper biocompatibility (>90% porosity and swelling in DDW and PBF vary between 287%~72%). Tensile strength (TS), E modulus (Young’s modulus), Elongation at maximum, and Elongation at break are observed to perceive the mechanical properties of hybrid film samples, which are compatible with mechanical properties of different tissue such as trabecular bone, articular cartilage, tendon, nerve and skin tissue. Though, biocompatibility tests both in vivo and in vitro are essential for clinical application in the future. However, the experiment carried out till now explains the true possibility of newly synthesized hybrid films for long-term drug delivery directly on wound sites for wound healing and burn dressing patients in head-neck surgery reconstruction, diabetic gangrene foot, as well as cartilage or joint replacement therapy.

关键词： HAP PVA Gelatin Swelling Test Tensile Strength

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Effect of Strain Rate on Tensile Behavior of Sn-9Zn-xAg-ySb;{(x, y) = (0.2, 0.6), (0.2, 0.8), (0.6, 0.2), (0.8, 0.2)} Lead-Free Solder Alloys

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Materials Sciences and Applications 2023年第4期14卷 273-283页

作者： Shihab Uddin md. abdul Gafur Mohammad Obaidur Rahman Department of Physics Jahangirnagar University Savar Dhaka Bangladesh Pilot Plant and Process Development Centre Dhaka Bangladesh

The tensile properties of Sn-9Zn-xAg-ySb;{(x, y) = (0.2, 0.6), (0.2, 0.8), (0.6, 0.2), (0.8, 0.2)} lead-free solders were investigated. All the test samples were annealed at 150°C for 1 hour. The tests are carried out at room temperature at the strain rate of 4.17 × 10-3 s-1, 20.85 × 10-3 s-1, and 208.5 × 10-3 s-1. It is seen that the tensile strength increases and the ductility decrease with increasing the strain rate over the investigated range. From the strain rate change test results, the strain sensitivity values are found in the range of 0.0831 to 0.1455 due to the addition of different alloying elements.

关键词： Lead-Free Solder Strain Rate Strain Sensitivity Ductility Tensile Properties

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Studies of XRD and FTIR on Synthesized Novel Hybrid Thin Film Made of Hydroxyapatite, Poly Vinyl Alcohol and Gelatin for Biomedical Application

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Materials Sciences and Applications 2024年第9期15卷 336-349页

With the modern advancement of treatment approaches in medical science, the application of biomaterials in tissue engineering provides a remarkable opportunity to overcome graft rejection as well as proper wound healing. In this study, novel hybrid films have been synthesized by incorporation of polyvinyl alcohol (PVA), gelatin, and gelatin with glycerin along with different concentrations of pre-prepared hydroxyapatite (HAP) by solution casting method at room temperature in a biosafety cabinet. Glutaraldehyde has been added as a crosslinker in this whole procedure. Fourier-transform infrared spectroscopy (FTIR), X-Ray Diffraction (XRD) have been conducted to observe and compare the structural and chemical stability of the synthesized hybrid film properties. The FTIR results and X-Ray Diffraction analyses confirmed the chemical interactions between HAP, PVA, gelatin, and glycerin have occurred. The crystallinity of HAP also remains in all the prepared hybrid film samples that are observed in XRD. It is expected that these newly synthesized hybrid films could be a better opportunity for various sectors of tissue engineering such as skin, bone, tendon, and cartilage. These synthesized hybrid films can be suitable for wound healing covering. These studies could be a new scope for long-term drug delivery directly on wound sites in diabetic gangrene foot or burn patients as well as cartilage or joint replacement therapy.

关键词： XRD FTIR HAP PVA Gelatin

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Simulation of Natural Convection Flow with Magneto-Hydrodynamics in a Wavy Top Enclosure with a Semi-Circular Heater

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Open Journal of Applied Sciences 2023年第4期13卷 591-603页

作者： Mohammad Mahfuzul Islam md. abdul Alim md. Mahmud Alam md. Jahirul Haque Munshi Department of Mathematics Dhaka University of Engineering and Technology (DUET) Gazipur Bangladesh Department of Mathematics Bangladesh University of Engineering and Technology (BUET) Dhaka Bangladesh Department of Mathematics Hamdard University Bangladesh (HUB) Hamdard Nagar Gazaria Munshiganj Bangladesh

Natural convection flow in enclosure has different applications such as room ventilation, heat exchangers, the cooling system of a building etc. The Finite-Element method based on the Galerkin weighted residual approach is used to solve two-dimensional governing mass, momentum and energy-equations for natural convection flow in the presence of a magnetic field on a roof top with semi-circular heater. In the enclosure the horizontal lower wall was heated, the vertical two walls were adiabatic, inside the semi-circular heater, the wavy top wall cooled. The parameters Rayleigh number, Hartmann number and Prandtl number are considered. The effects of the Hartmann number and Rayleigh number on the streamlines, isotherms, velocity profiles and average Nusselt number are examined graphically. The local Nusselt number and the average Nusselt number of the heated portion of the enclosure with the semi-circular heater are presented in this paper. Finally, for the validation of the existing work, the current results are compared with published results and the auspicious agreement is achieved.

关键词： Natural Convection Magneto-Hydrodynamics (MHD) Finite Element Method (FEM) Wavy Enclosure Semi-Circular Heater

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Magnetohydrodynamic Boundary Layer Flow of Non-Newtonian Fluid and Combined Heat and Mass Transfer about an Inclined Stretching Sheet

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Open Journal of Applied Sciences 2015年第6期5卷 279-294页

作者： md. Shah Alam md. Rashedul Islam Mohammad Ali md. abdul Alim md. Mahmud Alam Department of Mathematics Chittagong University of Engineering and Technology (CUET) Chittagong Bangladesh Department of Computer Science and Engineering International Islamic University Chittagong (IIUC) Chittagong Bangladesh Department of Mathematics Bangladesh University of Engineering and Technology (BUET) Dhaka Bangladesh Mathematics Discipline Khulna University (KU) Khulna Bangladesh

The steady magneto hydrodynamic (MHD) boundary layer flow and combined heat and mass transfer of a non-Newtonian fluid over an inclined stretching sheet have been investigated in the present analysis. The effects of the flow parameters on the velocity, temperature, species concentration, local skin friction, local Nusselt number, and Sherwood number are computed, discussed and have been graphically represented in figures and tables for various values of different parameters. The numerical results are carried out for several values of the combined effects of magnetic parameter M, stretching parameter λ, Prandtl number Pr, Eckert number Ec, Schmidt number Sc, Soret number S0, slip parameter A and Casson parameter n on velocity, temperature and concentration profiles and also the skin-friction coefficient ?f?"(0)?local Nusselt number -θ'(0)?and local Sherwood number -ψ'(0)?are discussed and presented in tabular form. The results pertaining to the present study indicate that the velocity profiles decrease as the increase of magnetic field parameter, but reverse trend arises for the effect of Casson parameter and stretching ratio parameter for both Newtonian and non-Newtonian fluids. The temperature profiles increase forthe effect of magnetic parameter, Prandtl number and Eckert number in case of Newtonian and non-Newtonian fluids. The concentration profile increases for the effect of Soret number while concentration profile decreases for the increasing values of Schmidt number, magnetic parameter, Prandtl number and Eckert number for both Newtonian and non-Newtonian fluids. By considering the cooling plate the numerical results for the skin-friction coefficient f?"(0) , local Nusselt number?-θ'(0) and local Sherwood number ?-ψ'(0) are presented in Tables 1-3.

关键词： MHD Casson Fluid Stretching Sheet Angle of Inclination

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