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Experimental and analytical assessment of the hypervelocity impact damage of GLAss fiber REinforced aluminum

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Defence Technology（防务技术） 2022年第7期18卷 1232-1246页

作者： Md.zahid hasan Bangladesh Air Force Academy Bangladesh Air Force Base Matiur RahmanBAF Academy Road7404 JessoreKhulnaBangladesh

This article addresses the response of GLAss fiber REinforced aluminum to hypervelocity impacts of micrometeoroid analogs at impact velocities of 7 km/s and *** relation,the damage modes of different GLAss fiber REinforced aluminum configurations have been *** GLAss fiber REinforced aluminum configurations comprised six to twelve variably thick aluminum layers and up to four plies of glass fiber reinforced epoxy per composite *** impact experiments have been conducted with the help of a two-stage light-gas gun,wherein aluminum-and stainless steel projectiles were launched at velocities up to 7.15 km/*** inspection of the damage area suggested the dissipation of impact energy in elastic-plastic deformation,petalling,delamination,debonding,tensile failure of fibers,and pyrolysis of epoxy.A prevailing damage mode was not apparent *** quasi-isotropic ply orientation of S2-glass/FM94-epoxy laminates promoted the interference of shockand rarefaction waves and suppressed the damage area of GLAss fiber REinforced *** discriminate between the impact performance of different GLAss fiber REinforced aluminum configurations,the energy dissipated in different damage modes of GLAss fiber REinforced aluminum has been assessed *** terms of normalized energy,the cross-ply GLAss fiber REinforced aluminum dissipated higher energy in petal formation than in other primary damage *** normalized petalling energy was found to decline with the increase of impact *** outcomes of this study will help to optimize the GLAss fiber REinforced aluminum laminate,which will be employed as a bumper shield to prevent the fatal damage and the unzipping of a spacecraft pressure bulkhead.

关键词： Hypervelocity impact Petalling Fiber failure Volumetric compression Sublimation of epoxy

Pressure-dependent physical properties of cubic SrΒO3(Β=Cr,Fe)perovskites investigated by density functional theory

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Chinese Physics B 2020年第12期29卷 212-220页

作者： Md zahid hasan Md Rasheduzzaman Khandaker Monower Hossain Department of Electrical and Electronic Engineering International Islamic University ChittagongKumiraChittagong-4318Bangladesh Department of Materials Science and Engineering University of RajshahiRajshahi-6205Bangladesh

We perform the first-principles investigations of the structural,elastic,electronic,and optical properties of SrBO3(B=Cr,Fe)perovskites under pressure based on density functional theory(DFT).This is the first detailed pressure-dependent study of the physical properties for these *** calculated structural parameters are consistent with the existing experimental results and slightly decrease with the application of *** mechanical properties are discussed in detail and reveal that the SrCrO3 is harder than *** pressure,these compounds behave like half-metals,confirmed by their band structure and density of *** the SrCrO3 retains its half-metallic nature under pressure,SrFeO3 becomes metallic for both up-spin and down-spin *** charge density and bond overlap population reveal the covalent nature of Cr–O bond and Fe–O bond in the studied *** optical properties of SrBO3,also discussed for the first time,reveal some interesting results.

关键词： density functional theory(DFT) effects of pressure electronic band structure optical properties

Theory for Charge Density Wave and Orbital-Flux State in Antiferromagnetic Kagome Metal FeGe

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Chinese Physics Letters 2024年第4期41卷 90-104页

作者：马海洋殷嘉鑫 M.zahid hasan 刘健鹏 School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China ShanghaiTech Laboratory for Topological Physics ShanghaiTech UniversityShanghai 201210China Quantum Science Center of Guangdong-HongKong-Macao Greater Bay Area Shenzhen 518045China Laboratory for Topological Quantum Matter and Advanced Spectroscopy(B7) Department of PhysicsPrinceton UniversityPrincetonNew Jersey 08544USA Princeton Institute for Science and Technology of Materials Princeton UniversityPrincetonNew Jersey 08544USA Materials Sciences Division Lawrence Berkeley National LaboratoryBerkeleyCalifornia 94720USA Liaoning Academy of Materials Shenyang 110167China

We theoretically study the charge order and orbital magnetic properties of a new type of antiferromagnetic kagome metal *** on first-principles density functional theory calculations,we study the electronic structures,Fermi-surface quantum fluctuations,as well as phonon properties of the antiferromagnetic kagome metal *** is found that charge density wave emerges in such a system due to a subtle cooperation between electron-electron interactions and electron–phonon couplings,which gives rise to an unusual scenario of interaction-triggered phonon instabilities,and eventually yields a charge density wave(CDW)*** further show that,in the CDW phase,the ground-state current density distribution exhibits an intriguing star-of-David pattern,leading to flux density *** orbital fluxes(or current loops)in this system emerge as a result of the subtle interplay between magnetism,lattice geometries,charge order,and spin-orbit coupling(SOC),which can be described by a simple,yet universal,tight-binding theory including a Kane-Mele-type SOC term and a magnetic exchange *** further study the origin of the peculiar step-edge states in FeGe,which sheds light on the topological properties and correlation effects in this new type of kagome antiferromagnetic material.

关键词： interaction phonon orbital

Insights into the physical properties and anisotropic nature of ErPdBi with an appearance of low minimum thermal conductivity

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Chinese Physics B 2021年第1期30卷 398-406页

作者： S K Mitro R Majumder K M Hossain Md zahid hasan Md Emran Hossain M A Hadi Bangamata Sheikh Fojilatunnesa Mujib Science and Technology University Jamalpur-2012Bangladesh Physics Discipline Khulna UniversityKhulna-9208Bangladesh Department of Materials Science and Engineering University of RajshahiRajshahi-6205Bangladesh Department of Electrical and Electronic Engineering International Islamic University ChittagongKumiraChittagong-4318Bangladesh Department of Physics University of RajshahiRajshahi6205Bangladesh

We theoretically study the structural, elastic and optical properties of Er Pd Bi together with its anisotropic behaviors using density functional theory. It is observed that Er Pd Bi satisfies the Born stability criteria nicely and possesses high quality of machinability. The anisotropic behavior of Er Pd Bi is reported with the help of theoretical anisotropy indices incorporating 3 D graphical presentation, which suggests that Er Pd Bi is highly anisotropic in nature. It is noticed that the minimum thermal conductivity is very low for Er Pd Bi compared to the several species. This low value of minimum thermal conductivity introduces the potentiality of Er Pd Bi in high-temperature applications such as thermal barrier *** addition, deep optical insights of Er Pd Bi reveal that our material can be used in different optoelectronic and electronic device applications ranging from organic light-emitting diodes, solar panel efficiency, waveguides etc. to integration of integrated circuits. Therefore, we believe that our results will provide a new insight into high-temperature applications and will benefit for the development of promising optoelectric devices as well.

关键词： Er Pd Bi minimum thermal conductivity anisotropy density functional theory(DFT)

Poverty Reduction Strategy Bostwana Backyard

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Poverty Reduction Strategy Bostwana Backyard

作者： MD.zahid hasan（阿里）南昌大学

学位级别：硕士

电力是一个国家经济增长与社会经济发展的关键决定性因素。孟加拉的电力市场巨大，近年来，该国每年经济增长了6%，电力增长率也已超过10%。作为一个人口密集的发展中国家，电力在孟加拉意义非凡。然而，在过去的几十年里，该国发电厂... 详细信息

电力是一个国家经济增长与社会经济发展的关键决定性因素。孟加拉的电力市场巨大，近年来，该国每年经济增长了6%，电力增长率也已超过10%。作为一个人口密集的发展中国家，电力在孟加拉意义非凡。然而，在过去的几十年里，该国发电厂已无法满足人们对电力的需求。为了满足人们日益增长的电力需要，也为了支撑经济的发展，孟加拉政府已对本国的电力行业给予了高度重视，并鼓励国内私企与海外企业，尤其是中国企业积极投资此行业。另外，中国的电力市场已开发，对外直接投资这一投资策略也为中国发展电力行业起到了关键作用。如今，中国已成为世界能源消耗与电力消耗第二大国，其通过对外投资，在全球经济发展中扮演着极其重要的角色。因此，论文的目的在于研究孟加拉电力市场的环境，为中国投资者分析在孟加拉电力行业的投资潜力，同时也将指出中国投资者在投资孟加拉电力市场时所会遇到的各种挑战。论文第三章详细分析了中、孟两国电力与经济的概况;第四章探究了为了获得中国的投资，孟加拉电力行业所将拥有的机遇与可能性;第五章指出了孟加拉电力行业所存在的主要问题和投资者可能会遇到的挑战。综合研究，尽管孟加拉电力行业存在某些问题，但在政策自由化与市场需求条件方面，该行业还是可为中国投资者提供投资潜能的。最后，针对克服孟加拉行业所面临的问题与挑战，本文从而提出了几点宝贵建议。

关键词：外商直接投资电力行业机遇挑战孟加拉中国

Machine learning enabled identification and real-time prediction of living plants’ stress using terahertz waves

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Defence Technology（防务技术） 2022年第8期18卷 1330-1339页

作者： Adnan zahid Kia Dashtipour hasan T.Abbas Ismail Ben Mabrouk Muath Al-hasan Aifeng Ren Muhammad A.Imran Akram Alomainy Qammer H.Abbasi School of Engineering and Physical Science Heriot-Watt UniversityEdinburghEH144ASUK James Watt School of Engineering University of GlasgowGlasgowG128QQUK College of Engineering Al-Ain UniversityAbu DhabiUnited Arab Emirates School of Electronic Engineering Xidian UniversityXi'anShaanxiChina School of Electronic Engineering and Computer Science Queen Mary University of LondonLondonUK

Considering the ongoing climate transformations, the appropriate and reliable phenotyping information of plant leaves is quite significant for early detection of disease, yield improvement. In real-life digital agricultural environment, the real-time prediction and identification of living plants leaves has immensely grown in recent years. Hence, cost-effective and automated and timely detection of plans species is vital for sustainable agriculture. This paper presents a novel, non-invasive method aiming to establish a feasible, and viable technique for the precise identification and observation of altering behaviour of plants species at cellular level for four consecutive days by integrating machine learning (ML) and THz with a swissto12 materials characterization kit (MCK) in the frequency range of 0.75 to 1.1 THz. For this purpose, measurements observations data of seven various living plants leaves were determined and incorporate three different ML algorithms such as random forest (RF), support vector machine, (SVM), and K-nearest neighbour (KNN). The results demonstrated that RF exhibited higher accuracy of 98.87% followed by KNN and SVM with an accuracy of 94.64% and 89.67%, respectively, for precise detection of different leaves by observing their morphological features. In addition, RF outperformed other classifiers for determination of water-stressed leaves and having an accuracy of 99.42%. It is envisioned that proposed study can be proven beneficial and vital in digital agriculture technology for the timely detection of plants species to significantly help in mitigate yield and economic losses and improve crops quality.

关键词： Terahertz sensing Plants health Machine learning

Kagome superconductors AV3Sb5(A = K, Rb, Cs)

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National Science Review 2023年第2期10卷 260-275页

作者： Kun Jiang Tao Wu Jia-Xin Yin Zhenyu Wang M.zahid hasan Stephen D.Wilson Xianhui Chen Jiangping Hu Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences School of Physical Sciences University of Chinese Academy of Sciences Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China CAS Key Laboratory of Strongly-coupled Quantum Matter Physics Department of Physics University of Science and Technology of China Laboratory for Quantum Emergence Department of PhysicsSouthern University of Science and Technology Laboratory for Topological Quantum Matter and Advanced Spectroscopy (B7) Department of PhysicsPrinceton University Materials Department and California Nanosystems Institute University of California Santa Barbara Kavli Institute of Theoretical Sciences University of Chinese Academy of Sciences

The quasi-two-dimensional kagome materials AV3Sb5(A=K,Rb,Cs) were found to be a prime example of kagome superconductors,a new quantum platform to investigate the interplay between electron correlation effects,topology and geometric *** this review,we report recent progress on the experimental and theoretical studies of AV3Sb5and provide a broad picture of this fast-developing field in order to stimulate an expanded search for unconventional kagome *** review the electronic properties of AV3Sb5,the experimental measurements of the charge density wave state,evidence of time-reversal symmetry breaking and other potential hidden symmetry breaking in these materials.A variety of theoretical proposals and models that address the nature of the time-reversal symmetry breaking are ***,we review the superconducting properties of AV3Sb5,especially the potential pairing symmetries and the interplay between superconductivity and the charge density wave state.

关键词： kagome superconductor charge density wave time-reversal symmetry breaking topological metal

Early-Stage Cervical Cancerous Cell Detection from Cervix Images Using YOLOv5

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Computers, Materials & Continua 2023年第2期74卷 3727-3741页

作者： Md zahid hasan Ontor Md Mamun Ali Kawsar Ahmed Francis M.Bui Fahad Ahmed Al-Zahrani S.M.hasan Mahmud Sami Azam Department of Software Engineering(SWE) Daffodil International University(DIU)SukrabadDhaka1207Bangladesh Group of Biophotomatiχ Department of Information and Communication TechnologyMawlana Bhashani Science and Technology UniversitySantoshTangail1902Bangladesh Department of Electrical and Computer Engineering University of Saskatchewan57 Campus DriveSaskatoonS7N5A9SKCanada Computer Engineering Department Umm Al-Qura UniversityMecca24381Saudi Arabia Department of Computer Science American International University-Bangladesh(AIUB)KuratoliDhaka1229Bangladesh College of Engineering IT and EnvironmentCharles Darwin UniversityCasuarina0909NTAustralia

Cervical Cancer(CC)is a rapidly growing disease among women throughout the world,especially in developed and developing *** this many women have ***,it is curable if it can be diagnosed and detected at an early stage and taken proper *** the high cost,awareness,highly equipped diagnosis environment,and availability of screening tests is a major barrier to participating in screening or clinical test diagnoses to detect CC at an early *** solve this issue,the study focuses on building a deep learning-based automated system to diagnose CC in the early stage using cervix cell *** system is designed using the YOLOv5(You Only Look Once Version 5)model,which is a deep learning *** build the model,cervical cancer pap-smear test image datasets were collected from an open-source repository and these were labeled and *** the YOLOv5 models were applied to the labeled dataset to train the *** versions of the YOLOv5 model were applied in this study to find the best fit model for building the automated system to diagnose CC at an early *** of the model’s variations performed *** model can effectively detect cervical cancerous cell,according to the findings of the *** the medical field,our study will be quite *** can be a good option for radiologists and help them make the best selections possible.

关键词： Cervical cancer pap-smear deep learning cancerous cell YOLOv5 model

Effects of AG1 and AG2 QTLs on Nonstructural Carbohydrate and Seed Management Options for Rice Seedling Growth and Establishment under Flooding Stress

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Rice science 2020年第6期27卷 515-528页

作者： Satyen mondal M.Jamil hasan Tofayel Ahmed M.Giashuddin Miah Pompe C.Sta Cruz Abdel M.ISMAIL International Rice Research Institute DAPO Box 7777Metro Manilathe Philippines Bangladesh Rice Research Institute Gazipur 1701Bangladesh University of the Philippines Los Banos CollegeLaguna 4031the Philippines Bangabandhu Sheikh Mujibur Rahman Agricultural University Gazipur 1706Bangladesh

Rice(Oryza sativa)plants acquired excess photosynthates in the form of nonstructural carbohydrates(NSCs)in their stems and *** keen interest in rice NSC,the dynamics of NSC accumulation,translocation and re-accumulation have not yet been well ***1 and AG2 QTLs associated with flooding tolerance through catalyzing starch into soluble sugar in germinating *** we conducted three experiments,greenhouse and field to lay the groundwork for large-scale diversity studies on grain NSC and some agronomic traits under direct-seeded rice(DSR)system,using elite lines incorporating AG1,AG2 and AG1-AG2 QTLs into the popular varieties PSB Rc82 and Ciherang-Sub1 along with the donors Kho Hlan On(AG1)and Ma-Zhan Red(AG2).In germinating seedlings,soluble sugars increased,while starch concentration decreased gradually especially in the tolerant checks and AG1-AG2 introgression lines under flooded *** sugar accumulation in stem started to increase from the vegetative stage and peaked at the panicle initiation stage then gradually decreased towards the maturity *** Sub1-AG lines had higher sugar and starch concentrations at different growth stages than other genotypes in wet season 2016 and dry season *** survival rate was positively correlated with the stem NSC at the early vegetative stage(21 days after sowing),and stem NSC was positively associated with plant height at different growth *** the tested seeding rate,the most suitable seeding rate,4 g/m2 with shallow burial depth(0.5 cm),resulted in better seedling establishment,relatively higher seedling vigor index and higher leaf area index under flooding in DSR *** of AG1-AG2 QTLs had no any negative impact on nonstructural carbohydrate,germination rate,and growth and biomass production.

关键词： anaerobic germination crop establishment direct-seeded rice flooding nonstructural carbohydrate seeding rate seeding depth