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Screening legacy and emerging organic pollutants in the contaminated soil of Dhaka,Bangladesh

Emerging Contaminants 2024年第3期10卷 343-353页

作者： Refayat Nigar Shizhen Zhao Xin Liu Huanfang Huang Lele Tian Yuwei Xiao ahsan Habib Gan Zhang State Key Laboratory of Organic Geochemistry Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou510640China Guangdong-Hong Kong-Macao Joint Laboratory for Environmental Pollution and Control and Guangdong Provincial Key Laboratory of Environmental Protection and Resources Utilization Guangzhou510640China Anti-Drug Technology Center of Guangdong Province and National Anti-Drug Laboratory Guangdong Regional Center Guangzhou510230China State Environmental Protection Key Laboratory of Water Environmental Simulation and Pollution Control South China Institute of Environmental SciencesMinistry of Ecology and EnvironmentGuangzhou510530China Department of Chemistry University of DhakaDhaka1000Bangladesh University of Chinese Academy of Sciences Beijing100049China

The current understanding of the legacy and emerging organic pollutants in the soil of Bangladesh remains *** disposal practices,particularly in e-waste,landfills,and industrial operations,may lead to the pervasive presence of persistent organic pollutants(POPs)and polycyclic aromatic hydrocarbons(PAHs)in the *** study aimed to systematically investigate the concentrations,sources,and risk assessment of halogenated flame retardants(HFRs),polychlorinated biphenyls(PCBs),polychlorinated naphthalenes(PCNs),organochlorine pesticides(OCPs),chlorinated paraffins(CPs),and PAHs in the contaminated soil of Dhaka's dumpsites,e-waste,and industrial areas collected in *** total concentration of investigated pollutants averaged at 4790±4040 ng g^(-1)dw,with the following order:P44CPs(4110±4140 ng g^(-1)dw)>P16PAHs(422±491 ng g^(-1)dw)>P16HFRs(190±538 ng g^(-1)dw)>P209PCBs(43.5±73.5 ng g^(-1)dw)>P50PCNs(17.7±21.0 ng g^(-1)dw)>P27OCPs(9.41±9.61 ng g^(-1)dw).The e-waste site exhibited the highest total concentration of the target pollutants,reaching 12,700 ng g1 *** were the predominant contributors,accounting for averages of 81.8%,70.5%,and 68.5%to waste landfills,e-waste,and industrial sites,respectively.A comprehensive analysis of 209 PCB congeners revealed their primary origin from Aroclor PCBs,with minor contributions from unintentionally produced *** highest incremental lifetime carcinogenic risk(ILCR)occurred in e-waste sites,contributed by dioxin-like PCBs,with a maximum value of 5.9×10^(-5)for adults,exceeding the limit 1.0×10^(-6)set by the *** non-carcinogenic hazard quotients(HQs)were much lower,suggesting no significant risk from the investigated *** findings highlight the importance of proper waste management and regulated e-waste recycling to mitigate potential hazardous risks to the Bangladeshi population.

关键词： Persistent organic pollutants Polycyclic aromatic hydrocarbons Chlorinated paraffins Polychlorinated biphenyls Risk assessment Contaminated soil Bangladesh

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南京夏季大气臭氧光化学特征与敏感性分析

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环境科学 2024年第3期45卷 1382-1391页

作者：罗丽彤章炎麟林煜棋 ahsan Mozaffar 曹梦瑶南京信息工程大学应用气象学院南京210044 南京信息工程大学教育部气候与环境变化国际合作联合实验室大气环境中心南京210044

对流层臭氧(O_(3))主要由氮氧化物(NOx)和挥发性有机物(VOCs)经过一系列光化学反应生成,反应过程呈现复杂的非线性关系.为深入了解O_(3)的光化学特征及生成机制,利用2018年夏季大气O_(3)与VOCs的观测数据,结合大气零维框架模拟模型F0AM-... 详细信息

对流层臭氧(O_(3))主要由氮氧化物(NOx)和挥发性有机物(VOCs)经过一系列光化学反应生成,反应过程呈现复杂的非线性关系.为深入了解O_(3)的光化学特征及生成机制,利用2018年夏季大气O_(3)与VOCs的观测数据,结合大气零维框架模拟模型F0AM-MCM,研究O_(3)超标日和非O_(3)超标日的O_(3)光化学特征之间的差异性.观测结果表明,O_(3)超标日期间φ(O_(3))和φ(TVOCs)的平均值分别为47.8×10^(-9)和49.0×10^(-9),为非O_(3)超标日期间O_(3)(26×10^(-9))和TVOCs(30×10^(-9))体积分数的1.8倍和1.6倍.使用F0AM模型,借助EKMA曲线和RIR分析等识别O_(3)敏感性,发现南京市O_(3)超标日和非O_(3)超标日O_(3)的形成均主要受VOCs和NOx的协同控制.F0AM-MCM模拟结果表明,在O_(3)超标日,·OH和HO_(2)的日平均混合比分别是非O_(3)超标日的1.3倍和1.8倍,表明O_(3)超标日期间具有更强的大气氧化能力,且·OH和HO_(2)的形成和损失速率也有明显的增加,表明自由基循环的增强.此外,O_(3)超标日的O_(3)生成速率明显高于非O_(3)超标日,从而导致了O_(3)超标日的O_(3)净生成速率明显高于非O_(3)超标日.以上发现提高了对南京夏季O_(3)超标日大气O_(3)光化学特征的认识.

关键词：臭氧(O_(3)) 挥发性有机物(VOCs) 臭氧敏感性 F0AM模型生成机制

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Airship aerodynamic model estimation using unscented Kalman filter

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Journal of Systems Engineering and Electronics 2020年第6期31卷 1318-1329页

作者： WASIM muhammad ALI ahsan Department of Electrical Engineering University of Engineering and TechnologyTaxila 47080Pakistan

An airship model is made-up of aerostatic,aerodynamic,dynamic,and propulsive forces and *** others,the computation of aerodynamic forces and torques is ***,wind tunnel experimentation and potential flow theory are used for their ***,the limitations of these methods pose difficulties in their accurate *** this work,an online estimation scheme based on unscented Kalman filter(UKF)is proposed for their *** proposed method introduces six auxiliary states for the complete aerodynamic *** uses an extended model and provides an estimate of a complete state vector along with auxiliary *** proposed method uses the minimum auxiliary state variables for the approximation of the complete aerodynamic model that makes it computationally less *** estimation performance is evaluated by developing a nonlinear simulation environment for University of Engineering and Technology,Taxila(UETT)*** performance is vali􀅫dated by performing the error analysis based on estimation error and 2-σ uncertainty *** the same problem,the extended Kalman filter(EKF)is also implemented and its results are compared with *** simulation results show that UKF successfully estimates the forces and torques due to the aerodynamic model with small estimation error and the comparative analysis with EKF shows that UKF improves the estimation re􀅫sults and also it is more suitable for the under-consideration problem.

关键词： airship unscented Kalman filter(UKF) extend Kalman filter(EKF) state estimation aerodynamic model estimation

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Computational Fluid Dynamics(CFD) Modeling of Heat Transfer in a Polymeric Membrane using Finite Volume Method

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Journal of Thermal Science 2016年第6期25卷 564-570页

作者： muhammad ahsan Arshad Hussain School of Chemical and Materials Engineering(SCME) National University of Sciences and Technology(NUST)

The efficiency,robustness and reliability of recent numerical methods for finding solutions to flow problems have given rise to the implementation of computational fluid dynamics(CFD) as a broadly used analysis method for engineering problems like membrane separation *** CFD modeling in this study observes steady and unsteady(transient) heat flux and temperature profiles in a polymeric(cellulose acetate) *** study is novel due to the implementation of user defined scalar(UDS) diffusion equation by using user-defined functions(UDFs) infinite volume method(FVM).Some details of the FVM used by the solver are carefully discussed when implementing terms in the governing equation and boundary conditions(BC).The contours of temperature due to high-temperature gradient are reported for steady and unsteady problems.

关键词： unsteady solver scalar polymeric Membrane robustness governing carefully details discretization

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Ordering and disordering of in situ grown MgAl-layered double hydroxide and its effect on the structural and corrosion resistance properties

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International Journal of Minerals,Metallurgy and Materials 2019年第12期26卷 1570-1577页

作者： muhammad ahsan Iqbal Michele Fedel Department of Industrial Engineering University of Trento

A MgAl-layered double hydroxide(MgAl-LDH)protective film was developed on AA6082 substrates via the in situ hydrothermal growth method to obtain a distinct cauliflower-like LDH structure,and coated substrates were further heat-treated in air at temperatures from 100 to 250℃ to further improve the corrosion resistance of MgAl-LDH by taking advantage of the LDH memory effect;also,the effect of calcination on MgAl-LDH structural stability and the corresponding corrosion resistance properties were *** structural characterization of uncalcined and calcined LDH films were examined using scanning electron microscopy,energy-dispersive spectroscopy,X-ray diffraction,thermogravimetric analysis,differential scanning calorimetry,and Fourier transform infrared *** corresponding corrosion protection efficiency of the developed coating was studied through potentiodynamic polarization experiments and by electrochemical impedance *** with uncalcined MgAl-LDH,the calcined film showed a relatively lower corrosion current density and a higher impedance value,especially after heat treatment at 250℃.The findings demonstrate that calcination strongly affects the oriented growth of the LDH and causes an increase in the surface area and contraction of the basal spacing,which in turn caused a compact structure that substantially influenced the LDH corrosion resistance properties.

关键词： layered double hydroxide calcination in situ growth thin films corrosion protection

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Exploring the Latest Trends in AI Technologies: A Study on Current State, Application and Individual Impacts

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Journal of Computer and Communications 2024年第8期12卷 21-36页

作者： Md ahsan Ullah Imran Mustakim Bin Aziz Anamika Tiwari Sanchita Saha Ashok Ghimire Department of Business Administration Westcliff University 17877 Von Karman Ave 4th Floor Irvine CA 92614 United States

Artificial Intelligence (AI) offers immediate insights to penetrate the overwhelming volume of everyday security warnings. The current body of research mostly examines the use of AI in the field of cyber security, but it does not adequately address the visual inspection of AI applications. The advent of AI has led to noticeable structural changes in the field of cyber security. This study facilitates the advancement of theory about artificial intelligence (AI) across several fields. It assists researchers in determining research paths and serves as a resource for corporations and governments to strategize the use of AI in areas such as cyber security, education, healthcare, and work-life balance. Numerous nations, organizations, and writers are intricately linked via cooperation and citation networks. Artificial intelligence is an academic discipline focused on the research and advancement of computer systems, robots, and other creations that possess human-like intelligence, which is defined by cognitive powers, learning capabilities, and adaptability. This research aimed to evaluate the present trajectory and influence of Artificial Intelligence (AI) on education, healthcare, cybersecurity, and work-life balance. Based on an initial examination, this research focused on evaluating the use and impact of AI in many domains, using a specific narrative and framework. The findings of this study will enable researchers to comprehend the prevailing pattern and the influence of people on the integration of AI into daily life.

关键词： Artificial Intelligence Cybersecurity Healthcare AI on Education Work-Life Balance

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Trip to China July 2024

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China's Foreign Trade 2024年第4期 62-63页

作者： Hammad ahsan K-Electric

I recently got the opportunity to visit China to attend a seminar organized by the China Counsel for the Promotion of International Trade(CCPIT),for participants from the Belt and Road Initiative(BRI)*** purpose of the seminar was to invite the delegates from BRI countries,and give them firsthand experience of the Chinese development miracle by introducing them to Chinese history,its governance methodology and how it has managed to carry out its significant progress in the last three decades,for example,by following policies that facilitated entrepreneurship,and providing businesses the right kind of platform.

关键词： carry Trade introducing

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Applying the Technology Acceptance Model (TAM) in Information Technology System to Evaluate the Adoption of Decision Support System

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Journal of Computer and Communications 2024年第8期12卷 242-256页

作者： Md Azhad Hossain Anamika Tiwari Sanchita Saha Ashok Ghimire Md ahsan Ullah Imran Rabeya Khatoon Department of Business Administration International American University 3440 Wilshire Blvd STE 1000 Los Angeles CA 90010 United States Department of Business Administration Westcliff University 17877 Von Karman Ave 4th Floor Irvine CA 92614 United States

With the beginning of the information systems’ spreading, people started thinking about using them for making business decisions. Computer technology solutions, such as the Decision Support System, make the decision-making process less complex and simpler for problem-solving. In order to make a high-quality business decision, managers need to have a great deal of appropriate information. Nonetheless, this complicates the process of making appropriate decisions. In a situation like that, the possibility of using DSS is quite logical. The aim of this paper is to find out the intended use of DSS for medium and large business organizations in USA by applying the Technology Acceptance Model (TAM). Different models were developed in order to understand and predict the use of information systems, but the information systems community mostly used TAM to ensure this issue. The purpose of the research model is to determine the elements of analysis that contribute to these results. The sample for the research consisted of the target group that was supposed to have completed an online questionnaire about the manager’s use of DSS in medium and large American companies. The information obtained from the questionnaires was analyzed through the SPSS statistical software. The research has indicated that, this is primarily used due to a significant level of Perceived usefulness and For the Perceived ease of use.

关键词： Information Technology Decision Support System Business Organization in USA Technology Acceptance Model

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Renewable Energy: Prospects and Challenges in Bangladesh

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Energy and Power Engineering 2024年第2期16卷 43-78页

作者： Abul Fattah Mohammad Masum Rabbani Md. Masudur Rahman Rahat ahsan Habib Md. Nazrul Islam Bangladesh Police Dhaka Bangladesh Department of Chemistry University of Dhaka Dhaka Bangladesh

Among expert scientists and politicians, there is increasing agreement that it is absolutely necessary to reduce the emission of greenhouse gas (GHG) to lessen the severity of climate change. Although little, renewable energy sources currently reduce GHG that are being emitted from the energy industries. According to the majority of long-term energy estimates, renewable energy will be a substantial addition to the supply of energy worldwide by the end of this century, as capacity of renewable energy is gradually increasing in the early decades. However, developing nations like Bangladesh are largely reliant on pricey imported energy supplies (coal, gas, and oil) that lay a heavy weight on the country’s economy. Also, air pollution growing in importance as a national and international environmental issue. Regarding the development of clean and sustainable energy, renewable energy sources seem to be among the most practical and efficient alternatives, in both Bangladesh and globally. The geographic advantages of Bangladesh allow for widespread usage of the majority of such renewable energy sources. The comparative potential and use of fossil fuels against renewable energy sources globally and in Bangladesh is explored in this review.

关键词： Renewable Energy Solar and Photovoltaics Hydropower Wind Energy Geothermal

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Some Homological Characterizations of Semigroups and Semirings

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Acta Mathematica Sinica,English Series 2011年第10期27卷 2065-2072页

作者： Javed ahsan Zhong Kui LIU muhammad SHABIR Department of Mathematics International Islamic University H-10 CampusIslamabad 44000 Pakistan Department of Mathematics Northwest Normal University Lanzhou 730070 P. R. China Department of Mathematics Quaid-i-Azam University Islamabad 44000 Pakistan

In this paper we characterize semirings all of whose p-injective semimodules are injective. We also classify monoids all of whose p-injective acts are injective.

关键词： P-injective semimodule injective semimodule p-injective act injective act

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