检索结果-南通市图书馆

Numerical and Experimental Study of the Roughness Effects on Mechanical Properties of AISI316L by Nanoindentation

Modeling and Numerical Simulation of Material Science 2014年第4期4卷 153-162页

作者： Ling Chen Aylin Ahadi Jinming Zhou jan-eric stahl Division of Production and Materials Engineering Lund UniversityLundSweden Division of Mechanics Lund UniversityLundSweden

Surface roughness is a commonly used criterion for characterization of surface quality in a machining operation. In the study of micro-scale mechanical properties of machined surface and cutting tool using nanoindentation method, perfect surface finish on the specimen is often required for the reliable indentation result. However, the perfect surface finish is often difficult to obtain from the machining operation due to the dynamic behavior of the machining and the limitation of the cutting tool geometry. In the presented paper, the effect of surface roughness on the nanoindentation measurements is investigated by using finite element method. A 3D finite element model with seven levels of surface roughness is developed to simulate the load-displacement behavior in an indentation process with a Berkovich indenter. The material used in the simulation is AISI 316 L stainless steel, modeled as an elastic-plastic material. The mechanical properties were calculated by combining simulations with the Oliver-Pharr method. The hardness and reduced modulus from the simulation were found to decrease with an increase of roughness. The study showed that the scatter of the load-depth curves and the deviation of the hardness and the reduced modulus are significant affected by the variation of roughness. It was also found that the height of pile-up was little affected by the surface roughness from the simulation. The combined effect of indenter tip radius and surface roughness was also investigated. The study was complemented with experimental tests and the results from these tests support the results from the simulation.

关键词： Nanoindentation FEM Simulation Surface Roughness Elastic Modulus Hardness

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

镍基合金Inconel718可切削加工性的试验研究

引用

现代制造工程 2010年第2期 91-94页

作者：徐林红江征风 jan-eric stahl 武汉理工大学机电工程学院武汉430070 中国地质大学(武汉)机电工程学院武汉430070 瑞典隆德大学工业生产系瑞典22100

Inconel718是一种高强度耐热镍基合金,具有优良的高温强度、高温硬度和耐蚀性,在高温条件下能长期工作,已被广泛地应用于宇航工业、航空工业的涡轮发动机和相关零件的制造。分析Inconel718的机械性能、微观组织结构及其对切削加工性能... 详细信息

Inconel718是一种高强度耐热镍基合金,具有优良的高温强度、高温硬度和耐蚀性,在高温条件下能长期工作,已被广泛地应用于宇航工业、航空工业的涡轮发动机和相关零件的制造。分析Inconel718的机械性能、微观组织结构及其对切削加工性能的影响并进行了相关的试验验证,在试验数据的基础上,研究Inconel718中含碳量对切削过程中刀具磨损的影响。试验结果表明,Inconel718中含碳量在刀具后刀面磨损中起着非常重要的作用,Inconel718合金中含碳量越高,合金中所含的细微硬质夹杂物也越多,在切削过程中使刀具产生严重的后刀面磨粒磨损,从而降低材料的切削加工性。

关键词：镍基合金Inconel 718 可切削加工性刀具磨损

来源：

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

工件材料可切削加工性评价的图示法研究

引用

机械制造 2010年第2期48卷 36-38页

作者：徐林红江征风 jan-eric stahl 武汉理工大学机电工程学院武汉430070 中国地质大学(武汉)机电工程学院武汉430074 Division of Production and Materials Engineering Lund University Divisionof Production and Materials Engineering Lund University

在分析影响工件材料切削加工性的主要因素的基础上,提出了用图示法直观地描述和评价工件材料的切削加工性的新的表达方法。该切削加工性图与工件材料的机械性能和物理性能直接关联,图上5根轴分别代表了材料的5种物理机械性能。在对材料... 详细信息

在分析影响工件材料切削加工性的主要因素的基础上,提出了用图示法直观地描述和评价工件材料的切削加工性的新的表达方法。该切削加工性图与工件材料的机械性能和物理性能直接关联,图上5根轴分别代表了材料的5种物理机械性能。在对材料的性能量化的基础上,通过和参考材料性能的比较,得到其他材料的切削加工性图。该切削加工性图可以帮助工程技术人员了解材料在切削过程中的表现,通过比较不同材料的切削加工性图,在新材料或未知材料的切削加工过程中指导选择切削刀具、切削参数及其他切削条件。

关键词：工件材料机械性能可切削加工性评价图示法

来源：

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

国际糖尿病足工作组:指南的制定和方法学(2023)——《国际糖尿病足工作组:糖尿病相关的足病预防与管理指南(2023)》的一部分

引用

感染、炎症、修复 2024年第1期25卷 72-79页

作者： Sicco A.Bus Matilde Monteiro-Soares Fran Game Jaap J.van Netten jan Apelqvist Robert Fitridge eric Senneville Nicolaas C.Schaper on behalf of the IWGDF Editorial Board 朱虹何洁(译) 刘芳(审校) Amsterdam UMC University of AmsterdamDepartment of Rehabilitation MedicineAmsterdamthe Netherlands Amsterdam Movement Sciences program Rehabilitation&DevelopmentAmsterdamthe Netherlands Higher School of Health of the Portuguese Red Cross LisbonPortugal Department of Community Medicine Information and Health Decision Sciences(MEDCIDS)Faculty of MedicineUniversity of PortoPortoPortugal RISE@CINTESIS Faculty of MedicineOporto UniversityPortoPortugal Department of Diabetes and Endocrinology University Hospitals of Derby and Burton NHS Foundation TrustDerbyUK Department of Endocrinology University Hospital of MalmöSweden Discipline of Surgery The University of Adelaide and Vascular and Endovascular ServiceRoyal Adelaide HospitalAustralia Department of Infectious Diseases Gustave Dron HospitalTourcoingFrance Division of Endocrinology MUMC+CARIM and CAPHRI InstituteMaastrichtthe Netherlands 不详温州医科大学附属第一医院内分泌科浙江温州325000 上海交通大学医学院附属第一医院内分泌代谢科上海200080

糖尿病相关的足病是造成糖尿病患者经济负担和增加社会成本的主要原因之一。本指南以主要目标为导向,以循证医学为依据,且在全球得到合理实施。践行国际糖尿病相关的足病指南对于减轻患者经济负担和社会成本有着重要影响。国际糖尿病足... 详细信息

糖尿病相关的足病是造成糖尿病患者经济负担和增加社会成本的主要原因之一。本指南以主要目标为导向,以循证医学为依据,且在全球得到合理实施。践行国际糖尿病相关的足病指南对于减轻患者经济负担和社会成本有着重要影响。国际糖尿病足工作组(IWGDF)从1999年起开始发布并随后更新国际指南。2023年更新版指南相关推荐均基于推荐、评估、发展和评价分级(GRADE)系统,包括制定相关临床问题和重要结局,完成系统的文献系统综述和荟萃分析,完成评判表汇总,并且给予具体、明确、操作性强的推荐以及理论依据。本文阐述了《国际糖尿病足工作组:糖尿病相关的足病预防和管理指南(2023版)》(以下简称为指南)的制定过程。指南由7个部分组成,包括预防、糖尿病相关的足溃疡分类、减压、周围动脉病变、感染、创面愈合干预以及活动性夏科神经骨关节病,分别由7个独立的国际专家工作组编写。IWGDF编辑委员会对7个章节进行了整合和简化,形成IWGDF实践指南。指南中的每条推荐均经过IWGDF编辑委员会成员和相关领域的独立的国际专家审阅通过。本文是IWGDF指南的制定和方法学。我们相信,医务人员、公共卫生机构和政策制定者采用和实施2023年IWGDF指南,将会改善糖尿病相关的足病的预防和管理水平,从而减少全球该疾病患者和减轻该疾病引起的全球社会负担。

关键词：指南糖尿病糖尿病相关的足病方法学国际糖尿病足工作组

来源：

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

On the central symmetry of the circumstellar envelope of RS Cnc

引用

Research in Astronomy and Astrophysics 2015年第5期15卷 713-724页

作者： Pham Tuyet Nhung Do Thi Hoai jan Martin Winters Pierre Darriulat eric Grard Thibaut Le Bertre VATLY INST 179 Hoang Quoc Viet Cau Giay Hanoi Vietnam LERMA UMR 8112 CNRS & Observatoire de Paris 61 av. de l’Observatoire F-75014 ParisFrance IRAM 300 rue de la Piscine Domaine Universitaire F-38406 St. Martin d’Heres France GEPI UMR 8111 CNRS & Observatoire de Paris 5 Place J. Janssen F-92195 Meudon CedexFrance

We present a phenomenological study of CO（1-0） and CO（2-1） emission from the circumstellar envelope （CSE） of the Asymptotic Giant Branch （AGB） star RS Cnc. It reveals departures from central symmetry that turn out to be efficient tools for the exploration of some of the properties of the CSE. We use a wind model including a bipolar flow with a typical wind velocity of ～8 km s^-1 that decreases to ～2 km s^-1 near the equator. This wind model is used to describe Doppler velocity spectral maps obtained by merging data collected at the IRAM Plateau de Bure Interferometer and Pico Veleta single dish radio telescope. Parameters describing the wind morphology and kinematics are obtained, together with the radial dependence of the gas temperature in the domain of the CSE probed by the CO observations. Significant north-south central asymmetries are revealed by the analysis, which we quantify using a simple phenomenological description. The origin of such asymmetries is unclear.

关键词： stars AGB and post-AGB -- stars individual (RS Cnc) -- stars mass loss -- radio lines general

来源：

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

Musculoskeletal Conditions in Persons Living with HIV/AIDS:A Scoping Review

引用

Current Medical Science 2022年第1期42卷 17-25页

作者： Louise Schade Berg James JYoung Deborah Kopansky-Giles Stefan Eberspaecher Geoff Outerbridge eric LHurwitz jan Hartvigsen Department of Sports Science and Clinical Biomechanics University of Southern DenmarkOdense 5230Denmark Department of Research Canadian Memorial Chiropractic CollegeToronto M2H3 J1Canada Department of Family&Community Medicine University of TorontoMG51V7Canada Department of Orthopedic Surgery Princess Marina HospitalGaborone 8WVF+7H3Botswana World Spine Care Canadian Memorial Chiropractic CollegeToronto M2H 3J1Canada Office of Public Health Studies University of Hawaii at ManoaHonolulu 96822USA Chiropractic Knowledge Hub Odense 5230Denmark

Objective:Globally 37.9 million people are living with HIV/AIDS,and with mortality rates declining,there is an increasing focus on comorbidities including musculoskeletal(MSK)***,the aim of this scoping review was to generate and summarize an overview of the existing scientific literature dealing with MSK complaints in people living with HIV/AIDS(PLWHAs).Methods:This scoping review followed the five-stage methodological framework proposed by Arksey and O'Malley.

关键词： musculoskeletal conditions HIV AIDS

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Associations Between Two Measures of Trunk Muscular Endurance Among Male Law Enforcement Officers

引用

Journal of Science in Sport and Exercise 2021年第4期3卷 374-378页

作者： J.Jay Dawes Cody A.stahl Robert G.Lockie jan E.Redmond Charles L.Kornhauser Ryan J.Holmes Robin M.Orr Oklahoma State University StillwaterOK74078USA

Purpose The purpose of this study was to explore the relationship between two measures of trunk muscular *** Retrospective data for 520 male law enforcement officers(age 40.16±7.71 years;height=1.81±0.07 m;body mass=94.4±15.01 kg)belonging to a single US based law enforcement agency were used for this *** data provided included:age,height,body mass,sit-up repetitions completed in 1-min(SU)and time to completion for the isometric prone plank(IPP).A Pearson’s product correlation coefficient was used to determine the relationships between the SU and *** Significant(P<0.001)moderate(r=0.594,R^(2)=0.352)relationships were discovered between the SU and *** Based on the results of this study it appears that both the SU and IPP tests are appropriate for evaluating trunk muscular endurance,but measure separate qualities(i.e.,dynamic and static muscular endurance).

关键词： Sit-ups Planks Police Tactical Fitness testing

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

糖尿病相关的足病的定义和标准(2023年更新版)

引用

感染、炎症、修复 2024年第1期25卷 80-85页

作者： Jaap J.van Netten Sicco A.Bus jan Apelqvist Pam Chen Vivienne Chuter Robert Fitridge Frances Game Robert J.Hinchliffe Peter A.Lazzarini Joseph Mills Matilde Monteiro-Soares Edgar J.G.Peters Katherine M.Raspovic eric Senneville Dane K.Wukich Nicolaas C.Schaper on behalf of the International Working Group on the Diabetic Foot 张会峰(译) 许樟荣(审校) Department of Rehabilitation Medicine Amsterdam UMCLocation University of AmsterdamAmsterdamthe Netherlands Amsterdam Movement Sciences Program RehabilitationAmsterdamthe Netherlands Department of Endocrinology University Hospital of MalmöMalmöSweden Joondalup Health Campus Ramsay HealthcareSydneyAustralia Faculty of Health University of TasmaniaHobartAustralia School of Health Sciences Western Sydney UniversitySydneyAustralia Faculty of Health and Medical Sciences University of AdelaideAdelaideAustralia Vascular and Endovascular Service Royal Adelaide HospitalAdelaideAustralia Department of Diabetes and Endocrinology University Hospitals of Derby and Burton NHS Foundation TrustDerbyUK Department of Vascular Surgery University of BristolBristolUK School of Public Health and Social Work Queensland University of TechnologyBrisbaneAustralia Allied Health Research Collaborative The Prince Charles HospitalBrisbaneAustralia Michael E.DeBakey Department of Surgery Division of Vascular Surgery and Endovascular TherapyBaylor College of MedicineHoustonTexasUSA Portuguese Red Cross School of Health–Lisbon LisbonPortugal MEDCIDS–Departamento de Medicina da Comunidade Informação e Decisão em Saúde Faculty of Medicine of the University of PortoPortoPortugal RISE@CINTESIS Faculty of Medicine Oporto UniversityPortoPortugal Department of Internal Medicine Amsterdam UMCVrije Universiteit AmsterdamSection of Infectious DiseasesAmsterdamthe Netherlands Department of Orthopaedic Surgery University of Texas Southwestern Medical CenterDallasTexasUSA Department of Infectious Diseases Gustave Dron Hospital Tourcoing Univ-lilleTourcoingFrance Div.Endocrinology MUMC+CARIM and CAPHRI InstituteMaastrichtThe Netherlands 不详河南省人民医院内分泌科河南郑州450003 战略支援部队特色医学中心北京100101

糖尿病相关的足病管理涉及多个学科,通用的专业词汇对于各学科间准确沟通交流至关重要。国际糖尿病足工作组(IWGDF)对相关文献进行了系统综述,构成了制定IWGDF指南的基础,并且明确了糖尿病相关的足病的一系列定义、标准及名词解释。本... 详细信息

糖尿病相关的足病管理涉及多个学科,通用的专业词汇对于各学科间准确沟通交流至关重要。国际糖尿病足工作组(IWGDF)对相关文献进行了系统综述,构成了制定IWGDF指南的基础,并且明确了糖尿病相关的足病的一系列定义、标准及名词解释。本文介绍2023年IWGDF对这些定义和标准的更新,并建议在临床实践和研究中一致使用,以利于世界各地不同学科人员针对糖尿病相关的足病的专业性交流。

关键词：定义糖尿病糖尿病相关的足病国际糖尿病足工作组

来源：

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

Reduction and carburization of iron oxides for Fischer–Tropsch synthesis

引用

Journal of Energy Chemistry 2020年第12期29卷 48-61页

作者： Monia Runge Nielsen Asger Barkholt Moss Anton Simon Bjrnlund Xi Liu Axel Knop-Gericke Alexander YuKlyushin jan-Dierk Grunwaldt Thomas LSheppard Dmitry EDoronkin Anna Zimina Thomas eric Lyck Smitshuysen Christian Danvad Damsgaard Jakob Birkedal Wagner Thomas Willum Hansen DTU Nanolab Technical University of DenmarkDK-2800Kgs.LyngbyDenmark Department of Physics Technical University of DenmarkDK-2800Kgs.LyngbyDenmark SynCat@Beijing Synfuels China Technology Co.LtdBeijing 101407China School of Chemistry and Chemical Engineering Shanghai Jiao Tong UniversityShanghai 200240China Department of Inorganic Chemistry Fritz Haber Institute of the Max Planck SocietyD-14195 BerlinGermany Research Group Heterogeneous Reactions.Max Planck Institute for Chemical Energy Conversion D-45470 MulheimGermany Research Group Catalysis for Energy Helmholtz-Zentrum Berlin for Materials and Energy(BESSYⅡ)D-12489 BerlinGermany Institute for Chemical Technology and Polymer Chemistry Karlsruhe Institute of TechnologyD-76131 KarlsruheGermany Institute of Catalysis Research and Technology Karlsruhe Institute of TechnologyD-76344 Eggenstein-LeopoldshafenGermany

The activation of iron oxide Fischer–Tropsch Synthesis(FTS) catalysts was investigated during pretreatment: reduction in hydrogen followed by carburization in either CO or syngas mixture, or simultaneously reduction and carburization in syngas. A combination of different complementary in situ techniques was used to gain insight into the behavior of Fe-based FTS catalysts during activation. In situ XRD was used to identify the crystalline structures present during both reduction in hydrogen and carburization. An increase in reduction rate was established when increasing the temperature. A complete reduction was demonstrated in the ETEM and a grain size dependency was proven, i.e. bigger grains need higher temperature in order to reduce. XPS and XAS both indicate the formation of a small amount of carbonaceous species at the surface of the bulk metallic iron during carburization.

关键词： In situ characterization Fischer–Tropsch Catalyst reduction and carburization Iron oxides

来源：

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

贝叶斯因子及其在JASP中的实现

引用

心理科学进展 2018年第6期26卷 951-965页

作者：胡传鹏孔祥祯 eric-jan Wagenmakers Alexander Ly 彭凯平清华大学心理学系北京100084 Neuroimaging Center Johannes Gutenberg University Medical Center55131 MainzGermany Language and Genetics Department Max Planck Institute for Psycholinguistics6500 AH NijmegenThe Netherlands Department of Psychological Methods University of Amsterdam1018 VZ AmsterdamThe Netherlands Centrum Wiskunde&Informatica 1090 GB AmsterdamThe Netherlands

统计推断在科学研究中起到关键作用,然而当前科研中最常用的经典统计方法——零假设检验(Null hypothesis significance test,NHST)却因难以理解而被部分研究者误用或滥用。有研究者提出使用贝叶斯因子(Bayes factor)作为一种替代和(或... 详细信息

统计推断在科学研究中起到关键作用,然而当前科研中最常用的经典统计方法——零假设检验(Null hypothesis significance test,NHST)却因难以理解而被部分研究者误用或滥用。有研究者提出使用贝叶斯因子(Bayes factor)作为一种替代和(或)补充的统计方法。贝叶斯因子是贝叶斯统计中用来进行模型比较和假设检验的重要方法,其可以解读为对零假设H_0或者备择假设H_1的支持程度。其与NHST相比有如下优势:同时考虑H_0和H_1并可以用来支持H_0、不"严重"地倾向于反对H_0、可以监控证据强度的变化以及不受抽样计划的影响。目前,贝叶斯因子能够很便捷地通过开放的统计软件JASP实现,本文以贝叶斯t检验进行示范。贝叶斯因子的使用对心理学研究者来说具有重要的意义,但使用时需要注意先验分布选择的合理性以及保持数据分析过程的透明与公开。

关键词：贝叶斯因子贝叶斯学派频率学派假设检验 JASP

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：