检索结果-南通市图书馆

Prediction of vertical displacement for a buried pipeline subjected to normal fault using a hybrid FEM-ANN approach

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Structural and Civil Engineering 2024年第3期18卷 428-443页

作者： Hedye JALALI reza YEGANEH KHAKSAR Danial MOHAMMADZADEH S. Nader KARBALLAEEZADEH amir H.GANDOMI Department of Civil Engineering Architecture and UrbanismSadjad University of TechnologyPO Box ***MashhadIran Department of Civil Engineering Faculty of EngineeringEqbal Lahoori Institute of Higher EducationPO Box ***MashhadIran Faculty of Civil Engineering Architectureand ArtScience and Research Branch of Islamic Azad UniversityPO Box ***TehranIran Faculty of Engineering&Information Technology University of Technology SydneyUltimoNSW 2007Australia University Research and Innovation Center(EKIK) Óbuda UniversityBudapest 1034Hungary

Fault movement during earthquakes is a geotechnical phenomenon threatening buried pipelines and with the potential to cause severe damage to critical ***,effective prediction of pipe displacement is crucial for preventive management *** study aims to develop a fast,hybrid model for predicting vertical displacement of pipe networks when they experience *** this study,the complex behavior of soil and a buried pipeline system subjected to a normal fault is analyzed by using an artificial neural network(ANN)to generate predictions the behavior of the soil when different parameters of it are *** this purpose,a finite element model is developed for a pipeline subjected to normal fault *** data bank used for training the ANN includes all the critical soil parameters(cohesion,internal friction angle,Young’s modulus,and faulting).Furthermore,a mathematical formula is presented,based on biases and weights of the ANN *** results show that the maximum error of the presented formula is 2.03%,which makes the proposed technique efficiently predict the vertical displacement of buried pipelines and hence,helps to optimize the upcoming pipeline projects.

关键词： buried pipelines normal Fault finite element method multilayer perceptron neural network formulation

Limb Lengthening and Reconstruction Society orthopedic surgeons in the United States:An analysis of geographical distribution,academic,leadership,and demographic characteristics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Orthopedics 2024年第2期15卷 147-155页

作者： amir Human Hoveidaei reza Niakan Seyed Hossein Hosseini-Asl Abijith Annasamudram Janet D Conway International Center for Limb Lengthening Rubin Institute for Advanced OrthopedicsSinai Hospital of BaltimoreBaltimoreMD 21215United States Student Research Committee Shiraz University of Medical SciencesShiraz 73Iran Students’Scientific Research Center Tehran University of Medical SciencesTehran ***Iran

BACKGROUND The Limb Lengthening and Reconstruction Society(LLRS)is a premier orthopedic specialty organization that promotes limb reconstruction for all *** membership characteristics,however,are poorly *** study delineates orthopedic surgeon LLRS members’demographic traits,academic achievement,leadership attainment,and geographical distribution across the United *** To inform aspiring orthopedic professionals,as well as to promote growth and diversity in both the LLRS organization and overarching *** This cross-sectional study examined United States LLRS members’academic,leadership,demographic,and geographical *** reviewing the 2023 LLRS member directory,Google search results were matched to the listings and appended to the compiled *** and ethnicity were evaluated visually utilizing retrieved *** Hirsch index(H-index)of academic activity,residency and fellowship training,other graduate degrees,leadership positions,practice type(academic or non-academic),and spoken languages were *** members per state and capita determined geographic *** Mann Whitney U test was applied to compare H-index between males and females,as well as to assess member differences pertaining to affiliation with academic vs non-academic practice *** The study included 101 orthopedic surgeons,78(77.23%)Caucasian and 23(22.77%)non-Caucasian,79(78.22%)male and 22(21.78%)*** with DO degrees comprised only 3.96%(4)of the cohort,while the vast majority held MDs[96.04%(97)].Mean H-index was 10.55,with male surgeons having a significantly higher score(P=0.002).Most orthopedic surgeons(88.12%,)practiced in academic *** those professionals who occupied leadership positions,14%were women,while 86%were ***,19(37.25%)United States regions and the District of Columbia lacked an LLRS-member orthopedic *** per capita rate across the United States was 0.30 LLRS orthopedic

关键词： Limb lengthening and reconstruction Orthopedic surgeon demographics Orthopedic surgeon societal membership Orthopedic fellowships

CHARACTEIZATIONS OF WOVEN g-FRAMES AND WEAVING g-FRAMES IN HILBERT SPACES AND C*-MODULES

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Scientia 2023年第6期43卷 2471-2482页

作者： amir KHOSRAVI Mohammad reza FARMANI Faculty of Mathematical Sciences and Computer Kharazmi University

In this paper,using Parseval frames we generalize Sun’s results to g-frames in Hilbert C*-***,for g-frames in Hilbert spaces,we present some characterizations in terms of a family of frames,not only for orthonormal ***,we have a note about a comment and a relation in the proof of Proposition 5.3 in [*** et al.,On weaving g-frames for Hilbert spaces,Complex Analysis and Operator Theory,2020].Finally,we have some results for g-Riesz bases,woven and P-woven g-frames.

关键词： g-frame fusion frame woven frame Riesz basis g-Riesz basis 46L99 42C15 46H25

Optical Characterization of Palm Oil Biodiesel Blend

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

材料科学与工程（中英文版） 2011年第5期5卷 550-554页

作者： amir reza sadrolhosseini Mohd. Maarof Moksin W. Mahmood. Mat. Yunus Ahmad Mohammadi Zainal Abidin Talib Department of Physics Faculty of Science Universiti Putra Malaysia 43400 Serdang Malaysia Department of Electrical Engineering Faculty of Engineering Universiti Putra Malaysia 43400 Serdang Malaysia

In this study, Surface Plasmon Resonance (SPR) and minimum deviation methods were used for determining the optical properties of blend biodiesel. The SPR angle of resonance consistently shifted to lower value when the amount of biodiesel added to diesel fuel increased independent of the homogeneity of the sample. On the other hand the consistency of the minimum deviation method was dependent on the homogeneity of the blend biodiesel.

关键词：混合均匀性生物柴油光学特性棕榈油表面等离子体共振差方法 SPR 添加量

Performance of Densified Wood Glulam as Building Bio-Material

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Renewable Materials 2022年第2期10卷 511-526页

作者： reza Hajihassani Saman Ghahri Seyedeh Masoomeh Zamani amir Nourbakhsh Wood and Forest Products Research Division Research Institute of Forests and RangelandsAgricultural ResearchEducation and Extension Organization(AREEO)Tehran19395-1113Iran Research Institute of Forests and Rangelands Agricultural ResearchEducation and Extension Organization(AREEO)Tehran19395-1113Iran

In this research,some practical aspects of densified wood glulam were *** this aim,poplar wood specimens were densified by hygro-thermo-mechanical *** specimens were produced by finger joint technique and polyurethane glue was used as *** and mechanical properties of glulams were investigated according to ASTM D 143-09,ASTM D 905-03 and ISO 8375 *** on obtained results,using this process(steam and pressurize compaction)resulted in improvement of physical and mechanical prop-erties of glulam *** microscopic and scanning electron microscopic(SEM)pictures were proved structural changes on wood material during of applied ***,the increase of wood density and hygrothermal treatment has a positive role on the glulam properties especially its dimensional *** tech-nique showed a significant effect on water absorption;the steaming temperature and holding time significantly decreased water absorption but densification process increased this ***,delamination of specimens was decreased by hygrothermal treatment while densification showed negative effect on ***,modulus of rupture,modulus of elasticity,shear strength and compression strength parallel to grain were decreased by this technique but it is depend to treatment temperature and holding *** temperature and holding time cause to higher decrease in the glulam mechanical strength.

关键词： Wood modification glued laminated timber physical and mechanical properties

Applying data mining techniques to classify patients with suspected hepatitis C virus infection

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Intelligent Medicine 2022年第4期2卷 193-198页

作者： reza Safdari amir Deghatipour Marsa Gholamzadeh Keivan Maghooli Health Information Management Department School of Allied Medical SciencesTehran University of Medical SciencesTehranIran Health Information Management and Medical Informatics Department School of Allied Medical SciencesTehran University of Medical SciencesTehranIran Department of Biomedical Engineering Science and Research BranchIslamic Azad UniversityTehranIran

Background Hepatitis C virus(HCV)has a high prevalence worldwide,and the progression of the disease can cause irreversible damage to severe liver damage or even ***,developing prediction models using machine learning techniques is *** study was conducted to classify suspected patients with HCV infection using different classification *** The study was conducted using a dataset derived from the University of California,Irvine(UCI)Ma-chine Learning *** the HCV dataset was imbalanced,the synthetic minority oversampling technique(SMOTE)was applied to balance the *** cleaning the dataset,it was divided into training and test data for developing six classification *** six algorithms included the support vector machine(SVM),Gaus-sian Naïve Bayes(NB),decision tree(DT),random forest(RF),logistic regression(LR),and K-nearest neighbors(KNN)*** Python programming language was used to develop the *** operating characteristic curve analysis and other metrics were used to evaluate the performance of the proposed *** After the evaluation of the models using different metrics,the RF classifier had the best performance among the six *** accuracy of the RF classifier was 97.29%.Accordingly,the area under the curve(AUC)for LR,KNN,DT,SVM,Gaussian NB,and RF models were 0.921,0.963,0.953,0.972,0.896,and 0.998,respectively,RF showing the best predictive *** Various machine learning techniques for classifying healthy and unhealthy patients were used in this ***,the developed models might identify the stage of HCV based on trained data.

关键词： Data mining methods Classification Hepatitis Hepatitis C virus

Effect of graphene oxide on the corrosion,mechanical and biological properties of Mg-based nanocomposite

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2022年第2期29卷 305-319页

作者： Saeid Jabbarzare Hamid reza Bakhsheshi-Rad amir Abbas Nourbakhsh Tahmineh Ahmadi Filippo Berto Department of Materials Science Shahreza BranchIslamic Azad UniversityShahrezaIran Advanced Materials Research Center Department of Materials EngineeringNajafabad BranchIslamic Azad UniversityNajafabadIran Department of Mechanical and Industrial Engineering Norwegian University of Science and Technology7491 TrondheimNorway

This study investigates the effect of graphene oxide(GO)on the mechanical and corrosion behavior,antibacterial performance,and cell response of Mg–Zn–Mn(MZM)***/GO nanocomposites with different amounts of GO(i.e.,0.5 wt%,1.0 wt%,and1.5 wt%)were fabricated by the semi-powder metallurgy *** influence of GO on the MZM nanocomposite was analyzed through the hardness,compressive,corrosion,antibacterial,and cytotoxicity *** experimental results showed that,with the increase in the amount of GO(0.5 wt%and 1.5 wt%),the hardness value,compressive strength,and antibacterial performance of the MZM nanocomposite increased,whereas the cell viability and osteogenesis level decreased after the addition of 1.5 wt%***,the electrochemical examination results showed that the corrosion behavior of the MZM alloy was significantly enhanced after encapsulation in 0.5 wt%*** summary,MZM nanocomposites reinforced with GO can be used for implant applications because of their antibacterial performance and mechanical property.

关键词： magnesium-based nanocomposite graphene oxide powder metallurgy method mechanical property antibacterial activity biocompatibility

A new two-axis solar tracker based on the online optimization method:Experimental investigation and neural network modeling

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Energy and AI 2023年第4期14卷 341-359页

作者： amir Pouya Masoumi Vahid Bagherian Ali reza Tavakolpour-Saleh Elham Masoomi Department of Mechanical and Aerospace Engineering Shiraz University of TechnologyShirazIran Department of Mechanical Engineering Shiraz UniversityShirazIran Department of Computer Engineering Qazvin BranchIslamic Azad UniversityQazvinIran

This article presents a new two-axis solar tracker based on an online optimization algorithm so as to track the position of the sun without using its movement *** this research,four well-known optimization algorithms are employed to find the two unknown parameters named azimuth and zenith angles,which determine the position of the *** magnitude of the sunray is considered as the cost function of all ***,several experiments are carried out to find the best optimization algorithm with optimal population size,number of iterations,and also the best initialization *** initialization leads to faster convergence compared to random *** results clearly show that the particle swarm optimization algorithm with a population size of 15 and 7 iterations using uniform initialization method has better performance than the other algorithms,with a convergence time of less than 40 *** average fitness value or voltage received by the tracker is 2.4 Volts in this method,which is higher than other *** also performs well with a population size of 15 and 7 ***,the artificial neural network with one hidden layer and 20 neurons is employed to predict these two parameters in each day and moment in a year in Shiraz city according to the experimental data extracted from *** of the day from January and the time are inputs and zenith and azimuth angles are considered the output of neural network *** performance of the proposed ANN model is evaluated using regression plots,demonstrating a strong correlation between predicted and target ***,the outcomes reveal the feasibility of using online optimization algorithms and neural network modeling in an effort to bypass the complex mathematical model of mechatronic systems and predict the movement of the sun automatically.

关键词： Intelligent two-axis solar tracker Optimization algorithm Particle swarm optimization algorithm Online optimization method Artificial neural network

Developing a new constitutive model for hot deformation behaviors of Al/Cu bimetal composites based on their components

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2022年

作者： amir Arsalan SHAYANPOOR Hamid reza rezaEI ASHTIANI School of Mechanical Engineering， Arak University of Technology

In this paper， the hot deformation behavior of Al/Cu bimetal composites was investigated using isothermal compression tests at temperatures of 400–500 ℃， strain rates of 0.001–0.1 s-1by considering the effects of volume fractions of composite components (30%-51% Al). In this regard， new proper constitutive equations were developed using Arrhenius-type and the rule of mixture (ROM) models. Experimental flow stress (FS) showed that processing parameters and volume fraction affect the flow behavior of composite as the volume fraction of copper has a more substantial impact on the flow behavior of the composite rods at elevated temperatures. The values of correlation coefficient (R) and average relative error percentage of the developed Arrhenius-type constitutive equation and ROM model were 0.9826， 0.9742， and 0.9718， and also 0.18%， 1.69%， and -0.84% for volume fractions of 51， 42， and 30% Al， respectively. The results indicate that the newly developed constitutive model can successfully predict the hot working behavior of the considered bimetal composite. Finally， the microstructure of composites was investigated under different processing conditions. The dominant mechanisms for three considered volume fractions were identified at different ranges of temperature， strain， and strain rate specified for the hot deformation of the Al/Cu composite.

关键词：