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Teaching solid mechanics to artificial intelligence—a fast solver for heterogeneous materials

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npj Computational Materials 2021年第1期7卷 899-908页

作者： Jaber rezaei Mianroodi Nima H.Siboni Dierk Raabe Microstructure Physics and Alloy Design Max-Planck-Institut für EisenforschungDüsseldorfGermany DeepMetis BerlinGermany

We propose a deep neural network(DNN)as a fast surrogate model for local stress calculations in inhomogeneous non-linear *** show that the DNN predicts the local stresses with 3.8%mean absolute percentage error(MAPE)for the case of heterogeneous elastic media and a mechanical contrast of up to factor of 1.5 among neighboring domains,while performing 103 times faster than spectral *** DNN model proves suited for reproducing the stress distribution in geometries different from those used for *** the case of elasto-plastic materials with up to 4 times mechanical contrast in yield stress among adjacent regions,the trained model simulates the micromechanics with a MAPE of 6.4%in one single forward evaluation of the network,without any *** results reveal an efficient approach to solve non-linear mechanical problems,with an acceleration up to a factor of 8300 for elastic-plastic materials compared to typical solvers.

关键词： artificial network faster

Thermodynamic analysis of combined reforming process using Gibbs energy minimization method: In view of solid carbon formation

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Journal of Natural Gas Chemistry 2012年第6期21卷 694-702页

作者： Behzad Nematollahi Mehran rezaei Ebrahim Nemati Lay Majid Khajenoori Catalyst and Advanced Materials Research Laboratory Chemical Engineering Department Faculty of Engineering University of Kashan Institute of Nanoscience and Nanotechnology University of Kashan Energy Research Institute University of Kashan

Thermodynamic analysis was applied to study combined partial oxidation and carbon dioxide reforming of methane in view of carbon formation. The equilibrium calculations employing the Gibbs energy minimization were performed upon wide ranges of pressure （1-25 atm）, temperature （600-1300 K）, carbon dioxide to methane ratio （0-2） and oxygen to methane ratio （0-1）. The thermodynamic results were compared with the results obtained over a Ru supported catalyst. The results revealed that by increasing the reaction pressure methane conversion decreased. Also it was found that the atmospheric pressure is the preferable pressure for both dry reforming and partial oxidation of methane and increasing the temperature caused increases in both activity of carbon and conversion of methane. The results clearly showed that the addition of O2 to the feed mixture could lead to a reduction of carbon deposition.

关键词： combined reforming carbon deposition chemical equilibrium Gibbs energy minimization method thermodynamic analysis

Colostrum and milk performance,and blood immunity indices and minerals of Holstein cows receiving organic Mn,Zn and Cu sources

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Animal Nutrition 2020年第1期6卷 61-68页

作者： Habiballah Roshanzamir Javad rezaei Hassan Fazaeli Department of Animal Science Faculty of AgricultureTarbiat Modares UniversityP.O.Box 14U5-336TehranIran Animal Science Research Institute of Iran Agricultural ResearchEducation and Extension Organization(AREEO)Karaj.***Iran

Effects of supplementing the basal diets with Mn,Zn and Cu,as sulphate,glycine or methionine salts,on colostrum and milk performance,some blood immunity indices and blood minerals of pre-and postpartum Holstein cows were *** cows in different groups received:1)a diet without supplementary Mn,Zn and Cu(control),2)a diet containing Mn,Zn and Cu sulphates,3)a diet containing Mn,Zn and Cu glycine,or 4)a diet containing Mn,Zn and Cu methionine with 10 cows per group from d 60 before calving(dry period)to d 100 of *** matter intake(DMI),dry matter digestibility(DMD),colostrum and milk performance,milk somatic cell count(SCC),blood and milk total antioxidant capacity(TAC),immunoglobulin M(IgM)and immunoglobulin A(IgA),and blood Mn,Zn and Cu were *** supplementation with Mn,Zn and Cu as methionine,glycine or sulphate salts had positive effects on DMD,DMI,colostrum and milk performance,milk SCC,and blood Mn and *** of Mn,Zn and Cu in diets could increase(P0.05),however,the blood concentrations of IgA(except d 1 postpartum)and IgM in the cows supplemented with organic Mn,Zn and Cu were higher(P<0.05)than those in the cows receiving the sulphate sources of ***,dietary supplementation of Mn,Zn and Cu as methionine,glycine or sulphate salts can improve colostrum and milk performance,blood Zn and Mn and immunity indices in Holstein cows and their new-born ***,the organic sources of Mn,Zn and Cu have advantage over the sulphate forms in terms of the blood immunoglobulins.

关键词： Antioxidant status Cattle Immunity Organic trace minerals Performance

An evaluation of central Iran’s protected areas under different climate change scenarios (A Case on Markazi and Hamedan provinces)

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Journal of Mountain Science 2020年第1期17卷 68-82页

作者： Peyman KARAMI Sahar rezaei Shabnam SHADLOO Morteza NADERI Department of Environmental Sciences Faculty of Natural Resources and Environment SciencesMalay er UniversityMalayer65719-95863HamedanIran Department of Environmental Sciences Faculty of Natural Resources and Environment SciencesUniversity of GuilanSowmehsara419961-3778GuilanIran Department of Environmental Sciences Faculty of Agriculture and Natural SciencesArak UniversityArak 38156-8-8349Iran

Global climate change poses a new challenge for species and can even push some species toward an extinction vortex. The most affected organisms are those with narrow tolerance to the climatic factors but many large mammals such as ungulates with a wider ecological niche are also being affected indirectly. Our research mainly used wild sheep in central Iran as a model species to explore how the suitable habitats will change under different climatic scenarios and to determine if current borders of protected areas will adequately protect habitat requirements. To create habitat models we used animal-vehicle collision points as an input for species presence data. We ran habitat models using Max Ent modeling approach under different climatic scenarios of the past, present and future(under the climatic scenarios for minimum(RCP2.6) and maximum(RCP8.5) CO2 concentration trajectories). We tried to estimate the overlap and the width of the ecological niche using relevant metrics. In order to analyze the effectiveness of the protected areas, suitable maps were concerted to binary maps using True Skill Statistic(TSS) threshold and measured the similarity of the binary maps for each scenario using Kappa index. In order to assess the competence of the present protected areas boundary in covering the distribution of species, two different scenarios were employed, which are ensemble scenario 1: an ensemble of the binary maps of the species distribution in Mid-Holocene, present, and RCP2.6;and ensemble scenario 2: an ensemble of binary suitability maps in Mid-Holocene, present, and RCP8.5. Then, the borders of modeled habitats with the boundaries of 23 existing protected areas in two central provinces in Iran were compared. The predicted species distribution under scenario 1(RCP2.6) was mostly similar to its current distribution(Kappa = 0.53) while the output model under scenario 2(RCP8.5) indicated a decline in the species distribution range. Under the first ensemble scenario, curr

关键词： Climatic Scenarios Species Distribution Modeling Protected area Niche modeling Wild Sheep

Design and Fabrication of a Low-Loss Microstrip Lowpass-Bandpass Diplexer for WiMAX Applications

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China Communications 2020年第6期17卷 109-120页

作者： Leila Nouri Salah Yahya Abbas rezaei Institute of Research and Development Duy Tan UniversityDa Nang 550000Vietnam Faculty of Electrical–Electronic Engineering Duy Tan UniversityDa Nang 550000Vietnam Department of Communication and Computer Engineering Cihan University-ErbilErbilKurdistan RegionIraq Department of Software Engineering Faculty of EngineeringKoya UniversityKoya KOY45Kurdistan RegionIraq Department of Electrical Engineering Kermanshah University of TechnologyKermanshahIran

This work presents a compact lowpass-bandpass microstrip diplexer with a novel *** consists of a lowpass filter integrated with a bandpass filter via a simple compact *** proposed bandpass filter consists of four rectangular patch cells and some thin *** step impedance structures,with a radial cell,are applied to achieve a lowpass frequency *** lowpass channel of the introduced diplexer has 2.64 GHz cut-off frequency,whereas,the bandpass channel center frequency is 3.73 GHz for WiMAX applications and covers the frequencies3.31 GHz to 4 *** addition to having novel structures,both filters have other advantages in terms of high return loss,low insertion loss and high *** presented microstrip diplexer has the compact size of 29 mm×13.8 mm×0.762 mm,calculated at 2.64 *** obtained insertion losses are 0.20 dB(for the first channel)and 0.25 dB(for the second channel),which make the proposed diplexer suitable for energy *** stopband properties of both bandpass and lowpass filters are improved by creating several transmission *** comparison results show that the lowest insertion losses,the minimum gap between channels,good return losses,and good isolation are obtained.

关键词： compact diplexer lowpass-bandpass low-loss microstrip selectivity

Assessments on emergy and greenhouse gas emissions of internal combustion engine automobiles and electric automobiles in the USA

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Journal of Environmental Sciences 2020年第4期32卷 297-309页

作者： Ran Jing Chen Yuan Hamidreza rezaei Jin Qian Zhen Zhang College of Natural Resources and Environment Joint Institute for Environmental Research&EducationSouth China Agricultural UniversityGuangzhou510642China Department of Civil and Environmental Engineering University of Maryland at College ParkMD20742USA Research&Development Institute in Shenzhen&School of Natural and Applied Sciences Northwestern Polytechnical UniversityXi'an710072China

Increasing energy consumption in the transportation sector results in challenging greenhouse gas(GHG)emissions and environmental *** paper involved integrated assessments on GHG emissions and emergy of the life cycle for the internal combustion engine(ICE)and electric automobiles in the USA over the entire assumed fifteen-year *** hotspots of GHG emissions as well as emergy indices for the major processes of automobile life cycle within the defined system boundaries have been *** potential strategies for reducing GHG emissions and emergy in the life cycle of both ICE and electric automobiles were further *** on the current results,the total GHG emissions from the life cycle of ICE automobiles are 4.48 E+07 kg CO2-e which is320 times higher than that of the electric *** hotspot area of the GHG emissions from ICE and electric automobiles are operation phase and manufacturing process,*** results were observed that comparable total emergy of the ICE automobiles and electric automobiles have been calculated which were 1.54 E+17 and 2.20 E+17 sej,*** on emergy index evidenced a better environmental sustainability of electric automobiles than ICE automobiles over the life cycle due to its higher *** the authors’knowledge,it is the first time to integrate the analysis of GHG emissions together with emergy in industrial area of automobile *** is expected that the integration of emergy and GHG emissions analysis may provide a comprehensive perspective on eco-industrial sustainability of automobile engineering.

关键词： Emergy Emergy Index Electric automobiles Greenhouse gas emissions Internal combustion engine automobiles

Biomass-fuelled combined heat and power: integration in district heating and thermal-energy storage

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Clean Energy 2021年第1期5卷 44-56页

作者： Masoud rezaei Mohammad Sameti Fuzhan Nasiri Department of Building Civil and Environmental Engineering(BCEE)Concordia UniversityMontrealQCCanada UCD Energy Institute University College DublinDublinIreland

Conventional approaches towards energy-system modelling and operation are based upon the system design and performance *** system-design optimization,the thermal or mechanical characteristics of the systems providing for the heat or electricity demands were derived separately without integration with the energy source and without interaction with demand,which results in low-efficiency energy *** paper presents a key review on the integration of biomass-powered combined heat and power(BCHP)systems in district-heating systems as well as coupling with thermal-energy *** BCHP design,the appropriate sizing of the associated components as part of the district-heating system is very important to provide the optimal dispatch strategy as well as minimized cost and environmental impact while it co-operates with thermal-energy *** strategies for the feasibility,evaluation and integration of biomass-powered energy systems in the context of district systems are also studied.

关键词： energy storage biomass combined heat and power(CHP) district heating mathematical programming optimization

Impacts of the precision agricultural technologies in Iran: An analysis experts’ perception & their determinants

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Information Processing in Agriculture 2018年第1期5卷 173-184页

作者： Somayeh Tohidyan Far Kurosh rezaei-Moghaddam Dept.of Agricultural Extension and Education School of AgricultureShiraz UniversityIran

Nowadays agricultural methods developments that are productively,economically,environmentally and socially sustainable are required *** concept of precision agriculture is becoming an attractive idea for managing natural resources and realizing modern sustainable agricultural *** purpose of this study was to investigate factors influencing impacts of precision agriculture from the viewpoints of Boushehr Province *** research method was a cross sectional survey and multi-stage random sampling was used to collect data from 115 experts in Boushehr *** to the results,experts found underground and surface waters conservation,rural areas development,increase of productivity and increasing income as the most important impacts of precision agricultural ***’attitudes indicate their positive view toward these kinds of *** behavioral attitude has the most effect on impacts.

关键词： Sustainable agriculture Precision agriculture Impact assessment Boushehr Iran

校园公共空间设计对中国古典园林曲径艺术的借鉴

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校园公共空间设计对中国古典园林曲径艺术的借鉴

作者： Maryam rezaei（美丽）绍兴文理学院

学位级别：硕士

大自然是世界各国园林艺术创造的灵感与源泉。中国人的自然观深受道教影响。中国园林被视为尊重与顺应自然规律的艺术典范。曲折的游赏路径,模仿自然的山石组合以及多种寓意的植物或装饰图案,可以给游人带来丰富的四季体验,好像置身于... 详细信息

大自然是世界各国园林艺术创造的灵感与源泉。中国人的自然观深受道教影响。中国园林被视为尊重与顺应自然规律的艺术典范。曲折的游赏路径,模仿自然的山石组合以及多种寓意的植物或装饰图案,可以给游人带来丰富的四季体验,好像置身于一个自然小世界。本研究立足于中外比较视野,通过全面诠释中国园林特有的文化性格,各要素的组成及文化符号的特征以及中国园林创造景观的相关要点,认为曲折的路径、平静的水面、中式亭子以及极具中国文化内涵的植物,有助于塑造具有教育和文化传承功能的校园公共空间。本研究一栋教学楼前0.16公顷(67m*24m)的公共绿地改造为例,在考虑消防和冬日阳光等客观因素前提下,根据北部教学楼的师生活动特点,使用几何曲线将该绿地转变为一个可穿行和休憩的公共艺术空间。初步设计方面,着重考虑曲线划分地块,用水池,植物以及户外家具等元素共同塑造着不同活动场所。考虑建筑出入口原有视线的开阔性,该绿地中心场地设置为下沉广场。为了古今氛围的融合,该场地还植入了古代中式亭子和一个流线型的景观表演台。随着对中国文化的进一步理解,将校园内代表四季的植物和绍兴市市花和乌篷船以及英国植物学家林奈的花钟元素植入校园公共空间,进一步将校园公共绿地转变具有植物科普功能的交流场所。中国园林是一个充满文化符号的艺术世界,多种类型的建筑以及不同景点的题名,应该是解构中国园林艺术创造规律的核心线索。这需要深厚的中文文学修养,才能更为透彻地理解中国文化。这是本研究需要进一步努力的方向。园林作为人类创造的理想休憩环境,在尊重自然规律基础上获得更丰富的学习体验以及推进文化创新,这一点中国与其他国家都是相通的。

关键词：公共艺术校园绿地空间中国古典园林曲径艺术