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Data-driven design of high-performance MASnxPb1-xI3 perovskite materials by machine learning and experimental realization

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Light(Science & Applications) 2022年第9期11卷 2115-2126页

作者： XIA CAI FENGCAI LIU ANRAN YU JIAJUN QIN mohammad HATAMVAND irfan AHMED JIAYAN LUO YIMING ZHANG HAO ZHANG YIQIANG ZHAN School of Information Science and Technology Fudan UniversityShanghai 200433China College of Information Mechanical and Electrical EngineeringShanghai Normal UniversityShanghai 200234China Center of Micro-Nano System Fudan UniversityShanghai 200433China Department of Physics Chemistry and BiologyLinkoping UniversityLinkoping SE-58183Sweden Key Laboratory of Micro and Nano Photonic Structures and Department of Optical Science and Engineering Fudan UniversityShanghai 200433China Yiwu Research Institute of Fudan University Chengbei RoadYiwu CityZhejiang 322000China

The photovoltaic performance of perovskite solar cell is determined by multiple interrelated factors,such as perovskite compositions,electronic properties of each transport layer and fabrication parameters,which makes it rather challenging for optimization of device performances and discovery of underlying ***,we propose and realize a novel machine learning approach based on forward-reverse framework to establish the relationship between key parameters and photovoltaic performance in high-profile MASnxPb1-xI3 perovskite *** proposed method establishes the asymmetrically bowing relationship between band gap and Sn composition,which is precisely verified by our *** on the analysis of structural evolution and SHAP library,the rapid-change region and low-bandgap plateau region for small and large Sn composition are explained,*** establishing the models for photovoltaic parameters of working photovoltaic devices,the deviation of short-circuit current and open-circuit voltage with band gap in defective-zone and low-bandgap-plateau regions from Shockley-Queisser theory is captured by our models,and the former is due to the deep-level traps formed by crystallographic distortion and the latter is due to the enhanced susceptibility by increased Sn4+*** more difficulty for hole extraction than electron is also concluded in the models and the prediction curve of power conversion efficiency is in a good agreement with Shockley-Queisser *** the help of search and optimization algorithms,an optimized Sn:Pb composition ratio near 0.6 is finally obtained for high-performance perovskite solar cells,then verified by our *** constructive method could also be applicable to other material optimization and efficient device development.

关键词： perovskite performance optimization

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Canted antiferromagnetic and optical properties of nanostructures of Mn_2O_3 prepared by hydrothermal synthesis

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Chinese Physics B 2012年第11期21卷 441-447页

作者： Qurat-ul-ain Javed Wang Feng-Ping M.Yasir Rafique Arbab mohammad toufiq M.Zubair iqbal Department of Physics School of Mathematics and PhysicsUniversity of Science and Technology Beijing

We have reported new magnetic and optical properties of Mn2O3 nanostructures. The nanostructures have been synthesized by the hydrothermal method combined with the adjustment of pH values in the reaction system. The particular characteristics of the nanostructures have been analyzed by employing X-Ray diffraction （XRD）, scanning electron microscopy （SEM）, energy dispersive X-ray （EDX） analysis, transmission electron microscopy （TEM）, high resolution transmission electron microscopy （HRTEM）, Raman spectroscopy （RS）, UV-visible spectroscopy, and the vibrating sample magnetometer （VSM）. Structural investigation manifests that the synthesized Mn2O3 nanostructures are orthorhombic crystal. Magnetic investigation indicates that the Mn2O3 nanostructures are antiferromagnetic and the antiferromagnetic transition temperature is at TN = 83 K. Furthermore, the Mn2O3 nanostructures possess canted antiferromagnetic order below the Neel temperature due to spin frustration, resulting in hysteresis with large coercivity （1580 Oe） and remnant magnetization （1.52 emu/g）. The UV-visible spectrophotometry was used to determine the transmittance behaviour of Mn203 nanostructures. A direct optical band gap of 1.2 eV was acquired by using the Davis-Mott model. The UV-visible spectrum indicates that the absorption is prominent in the visible region, and transparency is more than 80% in the UV region.

关键词： Mn2O3 orthorhombic nanocrystals UV transparency canted antiferromagnetic property

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Non-occupational lead exposure and hypertension in Pakistani adults

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2006年第9期7卷 732-737页

作者： RAHMAN Sohaila KHALID Nasir ZAIDI Jamshed Hussain AHMAD Shujaat iqbal mohammad Zafar Nuclear Chemistry Division Pakistan Institute of Nuclear Science and Technology P. O. Nilore Islamabad 45650 Pakistan Dean Faculty of Biosciences University of Health Sciences Lahore 54590 Pakistan

Hypertension is one of the most prevalent diseases in the developed and developing countries. Based on the long historical association and the provocative findings of blood pressure effects at low level of lead exposure a study was carried out to determine if an association existed between low blood lead concentration and hypertension. In this study the effects of low-level exposure to lead on blood pressure were examined among 244 adults using atomic absorption spectrometer. For quality assurance purpose certified reference materials i.e., Animal blood A-13, Bovine liver 1577 and cotton cellulose V-9 from IAEA （International Atomic Energy Agency） and NIST （National Institute of Standard Technology） were analyzed under identical experimental conditions. The mean age of hypertensive adults was 52 years （range 43-66）. The mean values of systolic and diastolic blood pressure were （209±11.7）（range 170-250） and （117±3.9）（range 105-140） mmHg respectively. Blood lead concentration ranged from 78-201 μg/L with a mean of 139 μg/L and 165-497 μg/L with a mean of 255 μg/k in normal and hypertensive adults respectively. Increase in systolic blood pressure was significantly predictive with increase in blood lead levels. Body mass index （BMI） and lipid profile including total cholesterol, low density lipoprotein cholesterol, high density lipoprotein cholesterol and triglyceride correlated with blood pressure.

关键词： Hypertension Lead exposure Biochemical parameters Body mass index

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Arabic Bank Check Processing: State of the Art

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Journal of Computer Science & Technology 2013年第2期28卷 285-299页

作者： irfan Ahmad Sabri A.Mahmoud Information and Computer Science Department King Fahd University of Petroleum & Minerals

In this paper, we present a general model for Arabic bank check processing indicating the major phases of a check processing system. We then survey the available databases for Arabic bank check processing research. The state of the art in the different phases of Arabic bank check processing is surveyed （i.e., pre-processing, check analysis and segmentation, features extraction, and legal and courtesy amounts recognition）. The open issues for future research are stated and areas that need improvements are presented. To the best of our knowledge, it is the first survey of Arabic bank check processing.

关键词： handwriting analysis document analysis text processing feature evaluation and selection pattern analysis

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Argemone mexicana extract alleviates gastrointestinal disorders by stimulating muscarinic receptors and blocking voltage-gated L-type calcium channels

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Asian Pacific Journal of Tropical Biomedicine 2021年第5期11卷 214-221页

作者： Rabia iqbal irfan Hamid Khalid Hussain Janbaz Muhammad Furqan Akhtar Ammara Saleem Ali Sharif Sohaib Peerzada Bushra Akhtar Kashif Sohail Sajid Ali Faculty of Pharmacy The University of LahoreLahorePakistan Cadson College of Pharmacy University of the PunjabLahorePakistan Department of Pharmacology Bahauddin Zakariya UniversityMultanPakistan Riphah Institute of Pharmaceutical Sciences Riphah International UniversityLahore CampusLahorePakistan Department of Pharmacology Faculty of Pharmaceutical SciencesGovernment College University FaisalabadFaisalabadPakistan Department of Pharmacology Faculty of Pharmaceutical and Allied health SciencesLahore College for Women UniversityLahorePakistan Institute of Pharmacy Physiology and PharmacologyUniversity of AgricultureFaisalabadPakistan Akson College of Pharmacy Mirpur University of Science and TechnologyMirpurAJKPakistan

Objective:To investigate the pharmacological potential of Argemone mexicana in treating constipation and emesis by using in vitro and in vivo ***:The spasmogenic and spasmolytic effects were evaluated on isolated rabbit jejunum fragments loaded in a tissue organ *** response was recorded with an isotonic transducer attached with Power Lab Data Acquisition *** laxative and antiemetic activities were assessed in BALB-c mice and poultry chicks challenged with carbamylcholine and copper sulphate stimulated emesis,***:The total phenolic and total flavonoids contents of the extract were(267.75±5.77)mg GAE/g and(73.86±6.01)mg QE/g,*** mexicana extract exerted spasmogenic effect on isolated rabbit jejunum segments with an EC_(50)value of 0.016 mg/m L,which was blocked by atropine(0.3μM).Argemone mexicana extract exerted spasmolytic effect in atropine treated jejunum fragments with an EC_(50)value of 2.185 mg/***,Argemone mexicana extract relaxed potassium(80 mM)-induced contractions(EC_(50):9.07 mg/mL),similar to a standard drug *** calcium channel blocker activity was confirmed by a rightward shift of concentration-response curve of calcium in the presence of Argemone mexicana extract(1-5 mg/mL)and verapamil(0.1-1μM).In addition,the extract increased the distance travelled by a charcoal in the gastrointestinal tract and exhibited antiemetic effect on copper sulphate induced emesis in ***:Argemone mexicana shows cholinergic agonist and calcium channel blocker activities,as well as antiemetic *** may be used as a potential agent for treating gastrointestinal disorders.

关键词： Argemone mexicana Muscarinic agonist Calcium channel blocker Constipation Emesis

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Dimeric quinacridone cyclophanes: Synthesis,structures,and photophysical properties

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Science China Chemistry 2011年第2期54卷 314-319页

作者： JAVAD iqbal State Key Laboratory of Supramolecular Structure and Materials College of Chemistry Jilin University

Two novel quinacridone (QA) cyclophanes with intrinsic intramolecular dye-dye interactions have been designed and synthesized.X-ray crystal structures as well as detailed photophysical properties have been well *** two dyes have a major advantage that efficient fluorescence quenching can be observed even in their dilute solutions.A comparison of photophysical properties between the dimeric QA cyclophane and its reference monomeric counterpart indicates that the dimerization is predominant for the fluorescence quenching of QA dyes in *** study provided some model QA derivatives with dimeric structures for understanding the fluorescence quenching of QA dyes in solutions.

关键词： quinacridone cyclophanes dye-dye interactions photophysics fluorescence quenching

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Isolation and Characterization of Cellulose Nanofiber(CNF)from Kenaf(Hibiscus cannabinus)Bast through the Chemo-Mechanical Process

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Journal of Renewable Materials 2024年第6期12卷 1057-1069页

作者： Rudi Dungani mohammad irfan Bakshi Tsabita Zahra Hanifa Mustika Dewi Firda A.Syamani Melbi Mahardika Widya Fatriasari School of Life Sciences and Technology Institut Teknologi BandungBandung40132Indonesia Research Center for Biomass and Bioproducts National Research and Innovation Agency(BRIN)Cibinong16911Indonesia

The present work emphasizes the isolation of cellulose nanofiber(CNF)from the kenaf(Hibiscus cannabinus)bast through a chemo-mechanical *** order to develop high CNF yield with superior properties of CNF for improving compatibility in varied applications this method is *** fiber purification involved pulping and bleaching treatments,whereas mechanical treatment was performed by grinding and high-pressure *** kraft pulping as a delignification method followed by bleaching has successfully removed almost 99%lignin in the fiber with high pulp yield and delignification *** morphology of the fibers was characterized by scanning electron microscopy,which showed a smooth surface,fiber bundles,gel-shaped nanofiber,and an average size of 94.05 nm with 69%of CNF in 34–100 nm *** chemo-mechanical process exhibited a more crystalline nature in CNF than pulp *** low zeta potential values exhibit the distribution of fibrils and colloidal suspension stability without any further agglomeration.A lower concentration of CNF is less stable exhibiting the product ***,the chemo-mechanical process for the isolation of CNF(Hibiscus cannabinus)from kenaf involves sustainable,low-cost,non-toxic,and cheap alternatives than other traditional methods.

关键词： Kenaf bast fiber kraft delignification and bleaching ultrafine grinder chemo-mechanical properties CNF

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Decoding molecular mechanisms:brain aging and Alzheimer's disease

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Neural Regeneration Research 2025年第8期20卷 2279-2299页

作者： Mahnoor Hayat Rafay Ali Syed Hammad Qaiser mohammad Uzair Khalid Al-Regaiey Roaa Khallaf Lubna Abdullah Mohammed Albassam Imdad Kaleem Xueyi Wang Ran Wang Mehwish SBhatti Shahid Bashir Atta-ur-Rahman School of Applied Biosciences(ASAB) National University of Sciences and Technology(NUST)IslamabadPakistan Department of Biotechnology Quaid-i-Azam UniversityIslamabadPakistan Department of Biological Sciences Faculty of Basic&Applied SciencesInternational Islamic University Islamabad(IIUI)IslamabadPakistan Department of Bioengineering King Fahd University of Petroleum and MineralsDhahranSaudi Arabia Department of Physiology College of MedicineKing Saud UniversityRiyadhSaudi Arabia Department of Neurology Neuroscience CenterKing Fahad Specialist HospitalDammamSaudi Arabia Department of Mental Health Neuroscience CenterKing Fahad Specialist HospitalDammamSaudi Arabia Department of Biosciences Commission on Science and Technology for Sustainable Development in the South(COMSATS University)IslamabadPakistan Department of Psychiatry The First Hospital of Hebei Medical UniversityShijiazhuangHebei ProvinceChina Mental Health Institute of Hebei Medical University ShijiazhuangHebei ProvinceChina Department of Neurobiology and Behavior University of CaliforniaIrvineCAUSA Neuroscience Center King Fahad Specialist Hospital DammamDammamSaudi Arabia

The complex morphological,anatomical,physiological,and chemical mechanisms within the aging brain have been the hot topic of research for *** aging process alters the brain structure that affects functions and cognitions,but the worsening of such processes contributes to the pathogenesis of neurodegenerative disorders,such as Alzheimer's *** these observable,mild morphological shifts,significant functional modifications in neurotransmission and neuronal activity critically influence the aging *** these changes is important for maintaining cognitive health,especially given the increasing prevalence of age-related conditions that affect *** review aims to explore the age-induced changes in brain plasticity and molecular processes,differentiating normal aging from the pathogenesis of Alzheimer's disease,thereby providing insights into predicting the risk of dementia,particularly Alzheimer's disease.

关键词： Alzheimer’s disease brain aging cognitive health dementia molecular mechanisms neuronal activity neuroplasticity neurotransmission

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Heat Transfer Analysis of MHD Power Law Nano Fluid Flow through Annular Sector Duct

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Journal of Thermal Science 2020年第1期29卷 169-181页

作者： AHMED Farhan iqbal Mazhar School of Natural Sciences National University of Science and Technology

Flow and heat transfer analysis of an electrically conducting MHD power law nano fluid is carried out through annular sector duct,under the influence of constant pressure *** types of nano particles(*** and TiO2)are used in power law nano *** implicit procedure,(SIP)is used to simulate the discretized coupled algebraic *** has been observed that volume fraction of nano particles,ϕand magnetic field parameter,Ha are favourable for the heat transfer rate,however,both resist the fluid *** of applied uniform transverse magnetic field exceeds in the case of shear thickening fluids(i.e.n>1)by increasing the value of Ha as compared to that in shear thinning fluids(i.e.n<1).Therefore,enhancement in heat transfer rate is comparably more in shear thickening ***,comparable limiting case study with published result is also carried out in this research paper.

关键词： electrically conducting power law nano fluid Cu nano particles TiO2 nano particles shear thickening fluid shear thinning fluid heat transfer rate friction factor

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Evaluation of the adsorption potential of titanium dioxide nanoparticles for arsenic removal

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Journal of Environmental Sciences 2009年第3期21卷 402-408页

作者： NABI Deedar ASLAM irfan QAZI Ishtiaq A Institute of Environmental Science and Engineering National University of Sciences and Technology Rawalpindi 46000 Pakistan

The adsorption potential of titanium dioxide （TiO2） nanoparticles for removing arsenic from drinking water was evaluated. Pure and iron-doped TiO2 particles are synthesized via sol-gel method. The synthesized TiO2 nanoparticles were then immobilized on ordinary sand for adsorption studies. Adsorption isotherms were conducted on the synthesized nanoparticles as well as the sand coated with TiO2 nanoparticles under varying conditions of air and light, namely, the air-sunlight （A-SL）, air-light （AL）, air-dark （AD） and nitrogen-dark （ND）. X-ray diffraction （XRD） analysis showed that the pure and iron-doped TiO2 nanoparticles were in 100% anatase crystalline phase with crystai sizes of 108 and 65 nm, respectively. Adsorption of arsenic on the three adsorbents was non-linear that could be described by the Freundlich and Langmuir adsorption models. Iron doping enhanced the adsorption capacity of TiO2 nanoparticles by arresting the grain growth and making it visible light responsive resulting in a higher affinity for arsenic. Similarly, the arsenic removal by adsorption on the sand coated with TiO2 nanoparticles was the highest among the three types of sand used. In all cases, As（V） was adsorbed more compared with As（Ⅲ）. The solution pH appeared to be the most important factor in controlling the amount of arsenic adsorbed.

关键词： arsenic removal titanium dioxide nanoparticles adsorption isotherm immobilization of nanoparticles on sand

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