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Source identification, contamination status and health risk assessment of heavy metals from road dusts in Dhaka, Bangladesh

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Journal of Environmental Sciences 2022年第11期34卷 159-174页

作者： Aklima Nargis Ahsan habib md Nazrul Islam Kai Chen md Shafiqul Islam Sarker A N M Al-Razee Wenbin Liu Guorui Liu Minggang Cai Coastal and Ocean Management Institute&State Key laboratory of Marine Environmental Science Xiamen UniversityXiamen 361005China Department of Chemistry University of DhakaDhaka 1000Bangladesh Central Chemical Laboratory Department of Narcotics ControlMinistry of Home AffairsDhaka 1204Bangladesh Department of Analytical Chemistry&Environmental Science Training Institute for Chemical IndustriesPolashNarsingdi 1611Bangladesh State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China

In this study, concentrations of Cr, Mn, Ni, Cu, Zn, Cd and Pb were determined in road dusts collected from different locations in Dhaka to assess source, contamination status and health risk. Energy-dispersive X-ray fluorescence spectroscopy and energy-dispersive X-ray spectroscopy were used to determine Cr, Mn, Ni, Cu, Zn, Cd and Pb and their mean concentrations were 162.27 ± 29.46, 721.18 ± 180.14, 35.65 ± 12.55, 104.56 ± 128.33, 515.32 ± 321.90,BDL, and 342.82 ± 591.20 mg/kg, respectively. Among the heavy metals, highest concentrations of Cu, Zn and Pb were found at urban sites-7(municipal waste dumping) and 8(medical waste incineration). Highest concentration of Cr followed by Cu and Zn was found at site-5(Tejgaon, urban). Principal component analysis revealed that anthropogenic activities are the potential sources for Cr, Ni, Cu, Zn and Pb while earth crust for Mn. Pollution index and pollution load index results suggested that all the sites were contaminated and/or degraded by Cr, Cu, Zn and Pb except sites-9(urban), 10(sub-urban), 11(rural) while sites-7 and 8(urban) were extremely degraded. For noncarcinogenic health risk, hazard quotient values for dermal were higher compared to that of inhalation/ingestion. Though hazard index values were less than 1 at all the sites, these were at least one order of magnitude higher for children group than that of adult group, thus the children group may face more noncarcinogenic health risk at sites -7 and 8. Values of incremental lifetime cancer risk were from 10to 10showed no carcinogenic health risk by road dusts contaminated with the heavy metals.

关键词： Heavy metal Road dust Dhaka Principal component analysis Pollution status Health risk assessment

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Optimal quantum well width and the effect of quantum well position on the performance of transistor lasers

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Optoelectronics Letters 2013年第1期9卷 18-20页

作者： md. Ahsan habib Subrata Das Saeed Mahmud Ullah Shahida Rafique Department of Electronics and Communication Engineering University of Information Technology and Sciences Department of Applied Physics Electronics and Communication Engineering University of Dhaka

Transistor laser (TL) model based on InGaP/GaAs/InGaAs/GaAs is analyzed and presented. It is realized that quantum well (QW) with width of 10 nm may be formed for low base threshold current density J th . The emission wavelength is found to be 1.05 μm, and the indium (In) composition is 0.25 for optimal QW width. It is identified that J th decreases with the movement of QW towards the base-emitter (B-E) interface. Small signal optical response is calculated, and the effect of QW position is studied. The bandwidth is enhanced due to the movement of the QW towards the emitter base junction.

关键词：量子阱激光器晶体管宽度位置性能阈值电流密度发射波长

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The efficacy of deep learning based LSTM model in forecasting the outbreak of contagious diseases

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Infectious Disease Modelling 2022年第1期7卷 170-183页

作者： Nurul Absar md.Nazim Uddin Mayeen Uddin Khandaker md.habib Ullah Department of Computer Science and Engineering BGC Trust UniversityBangladeshChittagong4381Bangladesh Centre for Applied Physics and Radiation Technologies School of Engineering and TechnologySunway UniversityBandar Sunway47500SelangorMalaysia Department of Physics Faculty of Science and TechnologyAmerican International University-Bangladesh(AIUB)Dhaka1229Bangladesh

The coronavirus disease that outbreak in 2019 has caused various health *** to the WHO,the first positive case was detected in Bangladesh on 7th March 2020,but while writing this paper in June 2021,the total confirmed,recovered,and death cases were 826922,766266 and 13118,*** to the emergence of COVID-19 in Bangladesh,the country is facing a major public health ***,the country does not have a comprehensive health policy to address this *** makes it hard to predict how the pandemic will affect the *** learning techniques can help us detect the disease's *** predict the trend,parameters,risks,and to take preventive measure in Bangladesh;this work utilized the Recurrent Neural Networks based Deep Learning methodologies like LongShort-Term ***,we aim to predict the epidemic's progression for a period of more than a year under various scenarios in *** extracted the data for daily confirmed,recovered,and death cases from March 2020 to August *** obtained Root Mean Square Error(RMSE)values of confirmed,recovered,and death cases indicates that our result is more accurate than other contemporary *** study indicates that the LSTM model could be used effectively in predicting contagious *** obtained results could help in explaining the seriousness of the situation,also mayhelp the authorities to take precautionary steps to control the situation.

关键词： COVID-19 LSTM Recurrent neural networks(RNN) Prediction RMSE

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Community-based cross-sectional seroprevalence study of hepatitis A in Bangladesh

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World Journal of Gastroenterology 2009年第39期15卷 4932-4937页

作者： Samir K Saha Setarunnahar Saha Salim Shakur Mohammed Hanif md Ahsan habib Sanjoy K Datta Hans L Bock Bangladesh Institute of Child Health Dhaka Shishu Hospital Institute of Public Health Glaxo-SmithKline Biologicals 89 Rue de l'Institut

AIM： TO elucidate the age-distribution of anti-hepatitis A virus （HAY） seroprevalence across different socioeconomic status （SES） categories in Bangladesh which, despite scarce data, is generally deemed to have high endemicity. METHODS： Blood samples of 818 subjects from a stratified samp#e of schools and hospitals, comprising different age categories and SES were collected. They were assayed for total anti-HAV antibodies. Social and medical history data were obtained using a questionnaire. RESULTS： Overall anti-HAV seroprevalence was 69.6%, increasing with age from 1-5 years （40.4%） to 〉 30 years （98.4%）. Seroprevalence was lowest （49.8%） in the high SES group and highest （96.5%） in the rural lower-middle SES group. Among subjects aged 6-20 years, anti-HAV seroprevalence was lowest in urban private school children （43.0%）, followed by urban government school children （76.2%） and rural school children （96.5%）（P 〈 0.01）. Within the high SESgroup, anti-HAV seroprevalence was 32.3% in subjects 〈 10 years and 51.7% in those aged 11-20 years. Until now Bangladesh has been deemed to have high endemicity for HAV. CONCLUSION： The transition from high to intermediate HAV endemicity may be underway; high SES adolescents and adults remain particularly at risk of symptomatic illness. Preventive measures need consideration.

关键词： Age groups Hepatitis A virus Hepatitis A virus seroprevalence Anti-hepatitis A virus antibodies Socioeconomic groups

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Performance Improvement of CIGS Solar Cell: A Simulation Approach by SCAPS-1D

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Energy and Power Engineering 2023年第8期15卷 291-306页

作者： md. Ferdous Wahid md. Nuralam Howlader Nazmul ahasan md. Mizanur Rahman Department of Electrical and Electronic Engineering Hajee Mohammad Danesh Science and Technology University Dinajpur Bangladesh

Thin-film solar cells possess the distinct advantage of being cost-effective and relatively simple to manufacture. Nevertheless, it is of utmost importance to enhance their overall performance. In this research work, copper indium gallium selenide (CIGS)-based ultra-thin solar cell (SC) configuration (Ag/ZnO/ZnSe/CIGS/Si/Ni) has been designed and examined using SCAPS-1D. The numerical calculations revealed that this new design resulted in a substantial improvement in SC performance. This study explores the utilization of two absorber layers, CIGS and Si, both with a total of 2 μm thickness, to enhance device performance while reducing material costs, observing an increase in key SC parameters as the Si absorber layer thickness is increased, reaching a maximum efficiency of 29.13% when CIGS and Si thicknesses are set at 0.4 μm and 1.6 μm, respectively with doping absorber doping density of 1014 cm-3. Furthermore, we analyze the impact of variation in absorber and buffer layer thickness, as well as doping concentration, surface recombination velocity (SRV), electron affinity, series-shunt resistance, and temperature, on optimized CIGS SC parameters such as short-circuit current density (JSC), open circuit voltage (VOC), fill factor (FF), and power conversion efficiency (PCE). The findings yielded by the investigation offer significant elucidation regarding the fabrication of economically viable and highly efficient non-hazardous CIGS ultra-thin SC.

关键词： Thin-Flim CIGS-Based Solar Cell Non-Toxic Solar Cell SCAPS-1D Numerical Simulation Renewable Energy

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Heavy metal contamination and health risk assessment of road dust from landfills in Dhaka-Narayanganj, Bangladesh

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Emerging Contaminants 2024年第1期10卷 117-125页

作者： Mrittika Chakraborty md Masudur Rahman Rahat Tasrina Rabia Choudhury Refayat Nigar Guorui Liu Ahsan habib Department of Chemistry University of DhakaDhaka1000Bangladesh Analytical Chemistry Laboratory Chemistry DivisionAtomic Energy Centre Dhaka Bangladesh Atomic Energy CommissionDhaka1000Bangladesh State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental ScienecsChinese Academy of SciencesBeijing100085China

In the recent years,air pollution has become an alarming issue for human health in many rapidly growing megacities including Dhaka and ***,pollution status and health risk have been assessed by the road dusts collected from landfills in Dhaka and Narayanganj through determination of heavy metals including Pb,Cd,Cr,As,Cu,Ni,Zn and Mn using atomic absorption *** collected dust samples have been grouped into three sizes,for example,150,75 and<75μm,to assess the degree of heavy metal accumulation in the dust *** dust particles were accumulated with high concentrations of Pb and As at Matuail landfills,whereas Cd,Cr,Zn,and Mn concentrations were highest at Narayanganj *** finer particles,for example 75μm,accumulated substantial concentrations of heavy *** index and pollution load index(PLI)results revealed that all of the sites were deteriorated by Pb,Cd,Cu,Zn and *** results exhibited that the quality of the Matuail landfill area was severely *** terms of non-carcinogenic health risk,the values of hazard quotient for ingestion were greater than those for inhalation and dermal *** adult groups,hazard index values for the Matuail landfills and medical waste incineration sites were greater than 1,while for the children groups,the values for the same areas,including the Narayanganj landfills,were also larger than *** values were at least one order of magnitude higher for the children groups than for the adult *** the results,it would be reasonable to draw the conclusion that non-carcinogenic health risks for children may be more prevalent in the relevant areas.

关键词： Road dusts Heavy metals Landfills Bangladesh Degree of accumulation Health risk assessment

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Healthcare delivery cost and anesthesiologists: Time to have a greater role and responsibility

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World Journal of Anesthesiology 2019年第3期8卷 19-24页

作者： habib md Reazaul Karim Department of Anaesthesiology and Critical Care All India Institute of Medical Sciences

With the advancement of technology and health sciences,health care delivery costs are steadily *** affects both households and ***,the present truth is that health has become an essential but unaffordable *** is very ***,up-to-date,costeffective health care delivery is one of the prime objectives,and focuses on administration and health care *** the per capita spent on health from public/government funds is very poor in developing countries,the responsibility of cost-effective health care delivery falls primarily on the shoulder of the treating *** are becoming an indispensable part of health care delivery,having a diverse role in the emergency,critical care,pain,and perioperative care of *** the population ages,the need for surgical care is also ***,the anesthesiologist can also play a more significant role in delivering cost-effective health care,and minimize the cost without affecting the *** brief narrative review analyzes the current practice of anesthesiologists in two prime areas in the context of cost-savings:Preoperative investigation and low/minimal flow anesthesia.

关键词： Health expenditures Cost control Anesthesiologists Anesthesia

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A Comparative Study of 3D Virtual Pattern and Traditional Pattern Making

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Journal of Textile Science and Technology 2024年第1期10卷 1-24页

作者： md. Ahshan habib md. Shamsul Alam Department of Fashion Design & Technology Sonargaon University Dhaka Bangladesh Department of Apparel Manufacture & Technology Sonargaon University Dhaka Bangladesh

Pattern making plays a key role in the aspect of fashion design and garment production, as it serves as the transformative process that turns a simple drawing into a consistent accumulation of garments. The process of creating conventional or manual patterns requires a significant amount of time and a specialized skill set in various areas such as grading, marker planning, and fabric utilization. This study examines the potential of 3D technology and virtual fashion designing software in optimizing the efficiency and cost-effectiveness of pattern production processes. The proposed methodology is characterized by a higher level of comprehensiveness and reliability, resulting in time efficiency and providing a diverse range of design options. The user is not expected to possess comprehensive knowledge of traditional pattern creation procedures prior to engaging in the task. The software offers a range of capabilities including draping, 3D-to-2D and 2D-to-3D unfolding, fabric drivability analysis, ease allowance calculation, add-fullness manipulation, style development, grading, and virtual garment try-on. The strategy will cause a shift in the viewpoints and methodologies of business professionals when it comes to the use of 3D fashion design software. Upon recognizing the potential time, financial, and resource-saving benefits associated with the integration of 3D technology into their design development process, individuals will be motivated to select for its utilization over conventional pattern making methods. Individuals will possess the capacity to transfer their cognitive processes and engage in introspection regarding their professional endeavors and current activities through the utilization of 3D virtual pattern-making and fashion design technologies. To enhance the efficacy and ecological sustainability of designs, designers have the potential to integrate 3D technology with virtual fashion software, thereby compliant advantages for both commercial enterpri

关键词： Pattern-Making 3D Pattern Making Virtual Fashion 3D-to-2D Unfolding Sustainable Designs

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A Smart Fluorescent Light Spectroscope to Identify the Pork Adulteration for Halal Authentication

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Food and Nutrition Sciences 2021年第1期12卷 73-89页

作者： Khondoker Ziaul Islam md. Abdullah Al ahasan md. Sanwar Hossain Mohammed Hadifur Rahman Ummey Sufia Mousumi md. Asaduzzaman Department of EEE Bangladesh University of Business and Technology Dhaka Bangladesh Department of CSE Bangladesh University of Business and Technology Dhaka Bangladesh Department of CSE Maolana Bhashani Science and Technology University Tangail Bangladesh

The complication of adulterated ingredients in processed food items is widely observed in the food industry and remains a continuous disquiet for end users. This problem may affect consumers’ spiritual beliefs, likewise with their fitness and diet. Hence commercial foods should be scrutinized for the precision of the avowed ingredients. This study is dedicated to developing a Fluorescent light Spectroscope to identify the pork adulteration. A simple way of DNA extraction process has been introduced to make the system more convenient. The spectral bands linked with pork fat (PF), beef fat (BF) and their combinations in different food formulation were skimmed, and recognized by correlating them to those spectroscopically illustrative to clean Pork or PF and other different items. Every material has the properties to absorb some light of specific wavelength, and our activity is to determine thus wavelength range at which are absorbed or make any change by the target material. The findings have revealed that spectroscopy can be used as one of the procedures to detect and quantify of pork in different foods and beverages formulation for Halal verification purposes. Special laborious procedures and equipment both are essential for the existing testing methods named RT-PCR (Reverse transcription-polymerase chain reaction) and ELISA (enzyme-linked immunosorbent assay). Most of the food processors and dealers are not skillful to conduct sufficient testing for their products with all these sample preparation, extraction, analysis, and obtaining results which can be overcome by our proposed setup.

关键词： Pork Adulteration Spectroscope DNA Extraction Fluorescence

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Creating Bengali Freebase Using Wikidata

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Journal of Computer and Communications 2023年第5期11卷 151-160页

作者： Rukaiya habib Mahmuda Ferdous md Musfique Anwar Department of Computer Science and Engineering Jahangirnagar University Dhaka Bangladesh Department of Computer Science and Engineering University of Development Alternative Dhaka Bangladesh

Freebase is a large collaborative knowledge base and database of general, structured information for public use. Its structured data had been harvested from many sources, including individual, user-submitted wiki contributions. Its aim is to create a global resource so that people (and machines) can access common information more effectively which is mostly available in English. In this research work, we have tried to build the technique of creating the Freebase for Bengali language. Today the number of Bengali articles on the internet is growing day by day. So it has become a necessary to have a structured data store in Bengali. It consists of different types of concepts (topics) and relationships between those topics. These include different types of areas like popular culture (e.g. films, music, books, sports, television), location information (restaurants, geolocations, businesses), scholarly information (linguistics, biology, astronomy), birth place of (poets, politicians, actor, actress) and general knowledge (Wikipedia). It will be much more helpful for relation extraction or any kind of Natural Language Processing (NLP) works on Bengali language. In this work, we identified the technique of creating the Bengali Freebase and made a collection of Bengali data. We applied SPARQL query language to extract information from natural language (Bengali) documents such as Wikidata which is typically in RDF (Resource Description Format) triple format.

关键词： Knowledge-Base Structured Data NLP RDF

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