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应变速率对密砂应力-应变特性影响的试验研究(英文)

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水利水电技术(中英文) 2024年

作者： md.rasel ahammed 邓刚张延亿胡敏云张茵琪中国水利水电科学研究院流域水循环模拟与调控国家重点实验室中国水利水电科学研究院水利部水工程建设与安全重点实验室中国水利水电科学研究院水利部白蚁防治重点实验室

【目的】砂是一种常见的建筑材料，在水利水电工程、交通、海洋和其他土木工程中应用广泛。与传统理论中假定加载过程瞬间完成不同的是，实际中的填筑加载过程总有一定速率，因为速率效应，砂在相同幅值荷载作用下的变形过程可能有一定... 详细信息

【目的】砂是一种常见的建筑材料，在水利水电工程、交通、海洋和其他土木工程中应用广泛。与传统理论中假定加载过程瞬间完成不同的是，实际中的填筑加载过程总有一定速率，因为速率效应，砂在相同幅值荷载作用下的变形过程可能有一定差异。这项研究旨在深入了解不同应变速率三轴剪切条件下砂的变形特性。【方法】本研究采用相对密度为0.9密砂，开展了一系列三轴固结排水剪切试验，在两种不同围压(750kPa和2000kPa)下对试样进行固结后，分别采用三种不同的常应变速率(0.00625%/min， 0.0625%/min，和0.625%/min)进行应变控制排水剪切。根据试验数据，绘制了应力-应变关系发展曲线，分析了应变速率对砂土偏应力和体积应变演化的影响。【结果】结果表明，在本试验采用的恒定应变速率和围压条件下，密砂在轴向应变约为2%时将发生屈服。屈服前，相同轴应变增量对应的土样偏应力增量和体积应变增量对剪切速率比较敏感，特别是体积应变，即加载应变速率较小时获得的土样剪应力较低，但体积应变(收缩)发展量较大。【结论】在屈服前，砂土的非线性模量随着加载速率的增加而增大；但是屈服后，当加载达到大应变(ε1=15%)条件时，应变率对砂土应力变形的影响不明显。另外，在相同围压下，以不同应变率加载的砂样在加载过程中的应力比(q/p)-偏应变关系呈现出良好的一致性。

关键词：密砂三轴固结排水试验应变率偏应力体积应变变形力学性能影响因素

Impact of Action Observation Therapy along with Usual Physiotherapy Intervention of Individual with Alzheimer’s Disease

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Advances in Alzheimer's Disease 2024年第1期13卷 1-10页

作者： Zahid Bin Sultan Nahid Faruq Ahmed Tuhin ahammed md Kutub Uddin md Sirazul Islam S M Maruf Hossain Sajib md Rafiqul Islam Department of Physiotherapy Saic College of Medical Science and Technology Mirpur Bangladesh Department of Physiotherapy Centre for the Rehabilitation of the Paralysed (CRP) Savar Bangladesh Department of Physiotherapy Centre for the Rehabilitation of the Paralysed (CRP) Mymensingh Bangladesh Department of Physiotherapy Centre for the Rehabilitation of the Paralysed (CRP) Mirpur Bangladesh Department of Physiotherapy State College of Health Sciences Dhaka Bangladesh

Alzheimer’s disease (AD) is a neurodegenerative disorder characterized by cognitive impairments in the initial stage, which lead to severe cognitive dysfunction in the later stage. Action observation therapy (AOT) is a multisensory cognitive rehabilitation technique where the patient initially observes the actions and then tries to perform. The study aimed to examine the impact of AOT along with usual physiotherapy interventions to reduce depression, improve cognition and balance of a patient with AD. A 67 years old patient with AD was selected for this study because the patient has been suffering from depression, dementia, and physical dysfunction along with some other health conditions like diabetes and hypertension. Before starting intervention, a baseline assessment was done through the Beck Depression Inventory (BDI) tool, the Mini-Cog Scale, and the Berg Balance Scale (BBS). The patient received 12 sessions of AOT along with usual physiotherapy interventions thrice a week for four weeks, which included 45 minutes of each session. After four weeks of intervention, the patient demonstrated significant improvement in depression, cognition, and balance, whereas the BDI score declined from moderate 21/63 to mild 15/63 level of depression. The Mini-Cog score improved from 2/5 to 4/5, and the BBS score increased from 18/56 to 37/56. It is concluded that AOT along with usual physiotherapy intervention helps to reduce depression, improve cognition and balance of people with AD.

关键词： Alzheimer’s Disease Action Observation Therapy Physiotherapy Intervention

Classification of ASD on Functional MRI Using Deep Convolutional Neural Network

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Classification of ASD on Functional MRI Using Deep Convoluti...

作者： md Shale ahammed 济南大学

学位级别：硕士

Autism spectrum disorder（ASD）is an abstruse brain disorder in neuroscience research,which lead by challenges of social interactions,speech and nonverbal communication,and repetitive *** of ASD is mostly based on behavioral analysis,which is time-consuming and depends on patient cooperation and examiner *** assessable analysis for ASD is rationally challenging due to the limitations of publicly available *** non-invasive whole-brain scans endure the aptitude to succor for diagnosing neuropsychiatric disorder diseases such as autism,dementia,and brain *** diagnostic or prognostic tools,functional Magnetic Resonance Imaging（f MRI）exposed affirmation to the biomarkers in neuroimaging research because of f MRI pickup inherent connectivity between the brain and *** are profound studies in ASD with introducing machine learning or deep learning methods that have manifested advanced steps for ASD predictions based on f MRI *** learning（ML）and deep learning（DL）are recently applied to diagnosing autistic brain images and changing the questionnaire troublesome policy to treat a *** are profound studies in ASD with introducing machine learning or deep learning methods that have manifested advanced steps for ASD predictions based on f MRI ***,there are some limitations using ML approaches such as investigation with functional magnetic resonance imaging（f MRI）,depend on region-based analysis,and handling with the big ***,utmost antecedent models have an inadequacy in their capacity to manipulate performance metrics such as accuracy,precision,recall,and F1-score,ROC curve,and AUC *** this thesis,we introduce ML and DL approaches to get state-of-the-art results to overcome all of these *** used the support vector machine（SVM）as the most popular ML classifier and deep neural network（DNN）to classify ASD,*** have done these works after investigation a vast amount of r

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Effects of arbuscular mycorrhizal fungi,biochar,selenium,silica gel,and sulfur on arsenic uptake and biomass growth in Pisum sativum L.

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Emerging Contaminants 2020年第1期6卷 312-322页

作者： Mohammad Zahangeer Alam md.Anamul Hoque Golam Jalal ahammed Lynne Carpenter-Boggs Department of Environmental Science Faculty of AgricultureBangabandhu Sheikh Mujibur Rahman Agricultural University(BSMRAU)Gazipur1706Bangladesh Department of Soil Science Bangladesh Agricultural University(BAU)MymensinghBangladesh College of Forestry Henan University of Science and TechnologyLuoyang471023PR China Department of Crop and Soil Sciences Washington State University(WSU)Pullman WA99164-6420USA

Arsenic(As)is carcinogenic and highly toxic to *** accumulate As when grown in field soils irrigated with As-contaminated *** accumulation of As in roots,shoots,and grains of pea varieties can negatively affect human health via the food *** research is focused on the biomass growth and alleviation of As accumulation in roots,shoots,and grains of pea varieties in high As soil amended with arbuscular mycorrhizal fungi(AMF),biochar(BC),selenium(Se),silica gel(Si-gel),and sulfur(S).Root,shoot,and grain masses were found higher in pea grown in As soil amended with AMF,Se,Si-gel,and *** with rice husk and sawdust BC was found less effective to increase growth parameters in Bangladesh Agricultural Research Institute(BARI)Motor *** in grains was reduced by 77%,71%,and 69%by AMF,Se,and Si-gel,*** is recommended that soil amendments with AMF,S,and Se have great potential for improving biomass production of pea grown in As-contaminated soil,as well as reducing As transfer to humans through the food chains.

关键词： Arsenic Pea Food chain AMF Food safety Metal

Finding the real COVID-19 case-fatality rates for SAARC countries

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Biosafety and Health 2021年第3期3卷 164-171页

作者： md Rafil Tazir Shah Tanvir ahammed Aniqua Anjum Anisa Ahmed Chowdhury Afroza Jannat Suchana Department of Statistics Shahjalal University of Science and TechnologySylhet 3114Bangladesh Biomedical Research Foundation Dhaka 1230Bangladesh

The crude case fatality rate(CFR),because of the calculation method,is the most accurate when the pandemic is over since there is a possibility of the delay between disease onset and *** crude CFR measures can better explain the pandemic situation by improving the CFR ***,no study has thoroughly investigated the COVID-19 adjusted CFR of the South Asian Association For Regional Cooperation(SAARC)*** study estimated both survival interval and underreporting adjusted CFR of COVID-19 for these ***,we assessed the crude CFR between genders and across age groups and observed the CFR changes due to the imposition of fees on COVID-19 tests in *** the daily records up to October 9,we implemented a statistical method to remove the delay between disease onset and outcome bias,and due to asymptomatic or mild symptomatic cases,reporting rates lower than 50%(95%CI:10%–50%)bias in crude *** found that Afghanistan had the highest CFR,followed by Pakistan,India,Bangladesh,Nepal,Maldives,and Sri *** estimated crude CFR varied from 3.708%to 0.290%,survival interval adjusted CFR varied from 3.767%to 0.296%and further underreporting adjusted CFR varied from 1.096%to 0.083%.Furthermore,the crude CFRs for men were significantly higher than that of women in Afghanistan(4.034%vs.2.992%)and Bangladesh(1.739%vs.1.337%)whereas the opposite was observed in Maldives(0.284%vs.0.390%),Nepal(0.006%vs.0.007%),and Pakistan(2.057%vs.2.080%).Besides,older age groups had higher risks of ***,crude CFR increased from 1.261%to 1.572%after imposing the COVID-19 test fees in ***,the authorities of countries with higher CFR should be looking for strategic counsel from the countries with lower CFR to equip themselves with the necessary knowledge to combat the ***,caution is needed to report the CFR.

关键词： COVID-19 SARS-CoV-2 Case fatality rates SAARC Southeast Asia

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IoT Based Nurse Activities Monitoring and Controlling System

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Advances in Internet of Things 2023年第3期13卷 63-82页

作者： Ahsan Ullah md. Emtiaz ahammed md. Mohiuddin Bhuiyan Sourob Chandra Dasgupta Kazi Hassan Robin Nazmus Sakib Department of Computer Science and Engineering World University of Bangladesh Dhaka Bangladesh

IoT technology has emerged as a valuable tool in modern healthcare, providing real-time monitoring of patients, effective management of healthcare, and proper administration of patient information. The proposed system aims to develop a system that can prevent backward blood flow from stopping saline fluid, as well as monitor the temperature, heart rate, and oxygen level of patients by using multiple sensors like weight, temperature and heart rate, etc. Additionally, the proposed system can monitor the room temperature and humidity for contributing to the patient’s overall comfort. In emergency situations, it includes an emergency push button for quick alert medical staff and initiates timely interventions. It is designed to support nurses and doctors in monitoring patients and providing timely interventions to prevent complications.

关键词： IoT Nursing Activities Patient Monitoring IV Saline Bag Arduino UNO NodeMCU (ESP8266) LM35 DHT11 MAX30102

Evaluate the Strength of Denim Goods Using Different Washing Technique

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Journal of Materials Science and Chemical Engineering 2021年第3期9卷 1-8页

作者： Jakaria Ahamed md. Faysal Mahmud md. Faysal ahammed Rony Mia md. Zahid Hasan Tarequl Hasan Khan Golam Qibria Limon Al Mojnun Shamim Department of Textile Engineering National Institute of Textile Engineering & Research (NITER) Savar Dhaka Bangladesh School of Textile Science & Engineering Wuhan Textile University Wuhan China College of Chemistry & Chemical Engineering Wuhan Textile University Wuhan China

Day by day, the demand and popularity of denim have increased. With the increase in demand for denim, washing has also increased. When we washed a piece of denim fabric, then its properties also changed. The properties are tensile strength, GSM, color fading, stiffness, abrasion resistance, moisture regain, etc. In this study, we conduct different washing processes on denim fabric such are Stonewash, Caustic wash, Acid wash, Normal wash, Pigment wash, Sandblasting, and Super whitewash. After washing, the properties of denim fabric have been analyzed especially strength. The tear and tensile strength were measured by ISO standard. From the above washing method, Normal & pigment wash showed good strength properties comparing with others.

关键词： Denim Fabric Washing Treatment Tear Strength Tensile Strength Normal Wash Pigment Wash

Ground-Based In Situ Measurements of Near-Surface Aerosol Mass Concentration over Anantapur:Heterogeneity in Source Impacts

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Advances in Atmospheric Sciences 2013年第1期30卷 235-246页

作者： B.S.K.REDDY K.R.KUMAR G.BALAKRISHNAIAH K.R.GOPAL R.R.REDDY V.SIVAKUMAR S.md.ARAFATH A.P.LINGASWAMY S.PAVANKUMARI K.UMADEVI Y.N.ahammed Aerosol and Atmospheric Research Laboratory Department of PhysicsSri Krishnadevaraya UniversityAnantapur 515003Andhra PradeshIndia Institute of Low Temperature Science Hokkoido UniversitySapporo 0600819Japan School of Physics University of KwaZulu-NatalDurban 4000South Africa Institute of Environmental Engineering National Chiao Tung UniversityHsinchuTaiwan Department of Physics Yogi Vemana UniversityKadapa 516003India

Surface measurements of aerosol physical properties were made at Anantapur （14.62°N, 77.65°E, 331 m a.s.l）, a semiarid rural site in India, during August 2008-July 2009. Measurements included the segregated sizes of aerosolsas as well as total mass concentration and size distributions of aerosols measured at low relative humidity （RH〈75%） using a Quartz Crystal Microbalance （QCM） in the 25-0.05 um aerodynamic diameter range. The hourly average total surface aerosol mass concentration in a day varied from 15 to 70 ug m-3, with a mean value of 34.02±9.05 ug m-3 for the entire study period. A clear diurnal pattern appeared in coarse, accumulation and nucleation-mode particle concentrations, with two local maxima occurring in early morning and late evening hours. The concentration of coarse-mode particles was high during the summer season, with a maximum concentration of 11.81±0.98 ug m-3 in the month of April, whereas accumulationmode concentration was observed to be high in the winter period contributed 〉68% to the total aerosol mass concentration. Accumulation aerosol mass fraction, Af （= Ma/Mt） was highest during winter （mean value of Af -0.80） and lowest （Af - 0.64） during the monsoon season. The regression analysis shows that both Reff and Rm are dependent on coarse-mode aerosols. The relationship between the simultaneous measurements of daily mean aerosol optical depth at 500 nm （AOD500） and PM2.5 mass concentration （[PM2.5]） shows that surface-level aerosol mass concentration increases with the increase in columnar aerosol optical depth over the observation period.

关键词： aerosols mass concentration size distribution effective radius backward trajectories

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Organic Amendments with Chemical Fertilizers Improve Soil Fertility and Microbial Biomass in Rice-Rice-Rice Triple Crops Cropping Systems

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Open Journal of Soil Science 2017年第5期7卷 87-100页

作者： md. Farid ahammed Anik md. Mizanur Rahman G. K. M. Mustafizur Rahman md. Khairul Alam Mahammad Shariful Islam Mst Fatima Khatun Soil Science Division Bangladesh Agricultural Research Institute Gazipur Bangladesh Department of Soil Science Bangabandhu Sheikh Mujibur Rahman Agricultural University Gazipur Bangladesh School of Veterinary and Life Sciences Murdoch University Perth Western Australia

Medium-term changes in the labile nutrient pool of microbial biomass carbon (MBC) and nitrogen (MBN) resulting from organic manure application in rice (Oryza sativa L.)-based triple cropping systems have been poorly studied. Therefore, the effects of organic materials on the soil physico-chemical properties and microbial biomass in rice fields were investigated at Bangabandhu Sheikh Mujibur Rahman Agricultural University, Bangladesh, from April 2010 to December 2012. Five treatments (control, cow dung, poultry manure, rice straw, and chemical fertilizer) were laid out in a randomized complete block design with four replications. The organic residues (2 t C ha-1) were applied 7 days before transplanting and were combined with inorganic fertilizers, following integrated plant nutrition systems. This paper presents the results from the last of the five consecutive rice growing seasons. All of the organic residues increased the pH, and organic C, N, P, and K contents of the soil. However, poultry manure was more efficient in increasing soil fertility than cow dung and rice straw, resulting in a significant increase in P from 22 mg·kg-1 to 63 mg·kg-1 at crop harvest. All of the organic residues also increased the soil water holding capacity and decreased bulk density. Furthermore, poultry manure resulted in significantly higher microbial biomass C (432 mg·kg-1;P < 0.05) and N (31.60 mg·kg-1;P < 0.05) levels in the soil at crop harvest, followed by cow dung and rice straw. These findings indicate that the regular application of organic residues and manures will help to enhance soil fertility and production sustainability.

关键词： Integrated Plant Nutrition Systems (IPNS) Poultry Manure Rice Straw Water Holding Capacity