检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

波浪腹板PEC梁抗震延性性能试验研究

地震工程与工程振动 2024年第5期44卷 108-117页

作者：陆天宇杨克家李杰蒋路楼汉忠浙江理工大学建筑工程学院浙江杭州310018 台州学院建筑工程学院浙江台州318000 杉达学院工程学院上海201259 宝武集团中央研究院上海200126

传统部分填充钢-混凝土(partially encased composite,PEC)梁通常选用平直腹板,该类腹板的受剪承载力偏低,且平直腹板与混凝土之间无机械咬合力,不利于两者的协同工作。为解决平直腹板带来的不利影响,选用波浪腹板进行截面替换,形成新... 详细信息

传统部分填充钢-混凝土(partially encased composite,PEC)梁通常选用平直腹板,该类腹板的受剪承载力偏低,且平直腹板与混凝土之间无机械咬合力,不利于两者的协同工作。为解决平直腹板带来的不利影响,选用波浪腹板进行截面替换,形成新型波浪腹板PEC梁。通过低周反复荷载试验,分析波浪腹板PEC梁在地震荷载作用下的抗震延性性能,研究了翼缘厚度、剪跨比对正弦波浪腹板PEC梁的承载力、破坏形式、变形能力、滞回耗能能力和刚度退化等的影响规律。研究结果表明:合理设计波浪腹板PEC梁的承载力和抗震延性性能较好;剪跨比对梁的破坏形式及延性有显著影响,翼缘厚度增大可以有效提高梁截面承载力,但过厚的翼缘会影响型钢与混凝土的协同工作性能,在试验中翼缘厚度较小,剪跨比较大的构件型钢与混凝土匹配度高,其延性和耗能能力发挥最为充分。

关键词：波浪腹板部分包覆复合材料低周反复荷载试验承载力滞回耗能

线上线下联合教学结合视频反馈教学法在诊断学教学中的应用

在线全文

学校读者我要写书评

暂无评论

中国继续医学教育 2024年第12期16卷 96-100页

作者：杨振誉谢珊马可嘉刘少俊中南大学湘雅三医院消化内科湖南长沙410013 益阳师范高等专科学校学前教育学院湖南益阳413000

目的探讨线上线下联合教学结合视频反馈教学法在诊断学教学中的应用效果。方法选取2022年2—8月中南大学湘雅三医院2019级五年制临床医学专业的136名学生作为研究对象,随机分配68名学生采用线上线下联合教学模式,设为线上线下联合组,其... 详细信息

目的探讨线上线下联合教学结合视频反馈教学法在诊断学教学中的应用效果。方法选取2022年2—8月中南大学湘雅三医院2019级五年制临床医学专业的136名学生作为研究对象,随机分配68名学生采用线上线下联合教学模式,设为线上线下联合组,其中34名学生进行视频反馈,为线上线下联合视频反馈组;其余不进行视频反馈,为线上线下联合未视频反馈组。另外的68名学生采用传统教学模式,设为传统教学组,其中34名学生进行视频反馈,为传统教学视频反馈组;其余不进行视频反馈,为传统教学未视频反馈组。所有学生由同医院同教师授课,比较各组学生的理论和实践技能考核总成绩。结果线上线下联合组学生的操作成绩[(39.11±7.14)分]和总成绩[(75.67±4.47)分]高于传统教学组学生[(31.58±6.02)分、(67.70±5.87)分],差异有统计学意义(P0.05)。视频反馈组学生的操作成绩[(36.93±6.30)分]和总成绩[(73.24±4.63)分]均高于未视频反馈组[(33.86±7.16)分、(70.33±6.21)分],差异有统计学意义(P0.05)。细分各组学生成绩发现,各组学生理论成绩比较,差异无统计学意义(P>0.05);各组之间学生的操作成绩和总成绩比较差异有统计学意义(P0.05)。线上线下联合视频反馈组学生成绩最好,其次为线上线下联合未视频反馈组,然后为传统教学视频反馈组再次,传统教学未视频反馈组最低。结论线上线下联合教学结合视频反馈教学法能提高学生的物理诊断学成绩,激发学生学习兴趣,提高自主学习能力,具有良好的教学效果。

关键词：线上线下联合教学法传统教学法诊断诊断学教学视频反馈体格检查

A global mantle conductivity model derived from 8 years of Swarm satellite magnetic data

在线全文

学校读者我要写书评

暂无评论

Earth and Planetary Physics 2023年第1期7卷 49-56页

作者： HongBo Yao ZhengYong Ren kejia Pan JingTian Tang KeKe Zhang Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring Ministry of Education(Central South University)Changsha 410083China Hunan Key Laboratory of Nonferrous Resources and Geological Hazards Exploration Central South UniversityChangsha 410083China School of Geosciences and Info-Physics Central South UniversityChangsha 410083China School of Mathematics and Statistics Central South UniversityChangsha 410083China State Key Laboratory of Lunar and Planetary Sciences Macao University of Science and TechnologyTaipaMacaoChina

Mantle conductivity imaging is one of the scientific goals of the forthcoming Macao Science Satellite-1(MSS-1).To achieve this goal,we develop a data analysis and inversion scheme for satellite magnetic data to probe global one-dimensional(1D)mantle conductivity *** this scheme,we present a new global mantle conductivity model by analyzing over 8 years of Swarm satellite magnetic ***,after sophisticated data selection procedures and the removal of core and crustal fields,the inducing and induced spherical harmonic coefficients of magnetic potential due to the magnetospheric ring current are ***,satellite Cresponses are estimated from the time series of these ***,the observed responses are inverted for both smooth and threejump conductivity models using a quasi-Newton *** obtained conductivity models are in general agreement with previous global mantle conductivity models.A comparison of our conductivity model with the laboratory conductivity model suggests the mean state of the upper mantle and transition zone is relatively *** scheme can be used to process the forthcoming Macao Science Satellite-1 magnetic data.

关键词： Macao Science Satellite-1 satellite magnetic data mantle conductivity global electromagnetic induction

在线全文

学校读者我要写书评

暂无评论

RK-05型甲醇合成催化剂的工业应用

煤化工 2024年第1期52卷 27-29页

作者：王敬楚可嘉申改燕晋能控股装备制造集团科技信息部山西晋城048006 晋能控股装备制造集团煤化工研究院山西晋城048006

简单介绍了甲醇合成工艺流程,从单位体积催化剂甲醇产量、生产负荷、合成塔压差、床层温度、转化率五个方面介绍了两批RK-05型甲醇合成催化剂的工业应用情况,结果表明:RK-05型甲醇合成催化剂在使用的初期、中期阶段具有床层温度分布均... 详细信息

简单介绍了甲醇合成工艺流程,从单位体积催化剂甲醇产量、生产负荷、合成塔压差、床层温度、转化率五个方面介绍了两批RK-05型甲醇合成催化剂的工业应用情况,结果表明:RK-05型甲醇合成催化剂在使用的初期、中期阶段具有床层温度分布均匀、生产负荷稳步提升、催化剂转化率比较稳定、甲醇产量较好等特点。

关键词：甲醇合成 RK-05型催化剂工业应用甲醇产量生产负荷合成塔压差床层温度转化率

Three-dimensional temperature prediction in cylindrical turning with large-chamfer insert based on a modified slip-line field approach

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2021年第10期34卷 265-281页

作者： Cheng HU kejia ZHUANG Yuanwei TANG Jian WENG Xiaoming ZHANG Han DING Hubei Digital Manufacturing Key Laboratory School of Mechanical and Electronic EngineeringWuhan University of TechnologyWuhan 430070China Institute of Advanced Materials and Manufacturing Technology Wuhan University of TechnologyWuhan 430070China AECC Guizhou Liyang Aviation Power CO.LTD Guiyang 550000China State Key Laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and TechnologyWuhan 430074China

Chamfered inserts have found broader applications in metal cutting process especially in high-performance machining of hard-to-cut materials for their excellent edge resistance and cutting ***,excessive heat generation and resulting high cutting temperature eventually cause severe tool wear and poor surface integrity,which simultaneously limits the optimal selection of machining *** the present study,an analytical thermal–mechanical model is proposed for the prediction of the three-dimensional(3-D)temperature field in cylindrical turning with chamfered round insert based on a modified slip-line field ***,an innovative discretization method is introduced in a general 3-D coordinate system to provide a comprehensive demonstration of the irregular cutting geometry and heat generation ***,a plasticity-theory-based slip-line field model is developed and employed to determine the intensities and geometries of every elementary heat sources in Primary Deformation Zones(PDZ),Secondary Deformation Zones(SDZ)and Dead Metal Zones(DMZ).At last,a 3-D analytical model is suggested to calculate the temperature increases caused by the entire heat sources and associated *** maximum cutting temperature region predicted is found existing upon the chip-tool contact area rather than the tool ***,the rationalities of cutting parameters employed are analyzed along with theoretical material removal rates and ensuing maximum cutting *** results indicate that the cutting conditions with large depth of cut and high cutting speed are more desirable than those with high feed *** proposed models are respectively verified through a series of 3-D Finite Element(FE)simulations and dry cutting experiments of Inconel 718 with chamfered round *** agreement has been reached between the predictions and simulations as well as the measurements,which confirms the correctness and effectiveness of the presented analy

关键词： Analytical model Chamfered round insert Dead metal zone Prediction of temperature Slip-line field

Collaborative slot secondary allocation based on flight wave operation

在线全文

学校读者我要写书评

暂无评论

International Journal of Intelligent Computing and Cybernetics 2023年第2期16卷 364-395页

作者： kejia Chen Jintao Chen Lixi Yang Xiaoqian Yang School of Economics and Management Fuzhou UniversityFuzhouChina

Purpose-Flights are often delayed owing to *** paper proposes a cooperative slot secondary assignment(CSSA)model based on a collaborative decision-making(CDM)mechanism,and the operation mode of flight waves designs an improved intelligent algorithm to solve the optimal flight plan and minimize the total delay of passenger ***/methodology/approach-Taking passenger delays,transfer delays and flight cancellation delays into account comprehensively,the total delay time is minimized as the objective *** model is verified by a linear solver and compared with the first come first service(FCFS)method to prove the effectiveness of the *** improved adaptive partheno-genetic algorithm(IAPGA)using hierarchical serial number coding was designed,combining elite and roulette strategies to find pareto ***-Comparing and analyzing the experimental results of various scale examples,the optimization model in this paper is greatly optimized compared to the FCFS method in terms of total delay time,and the IAPGA algorithm is better than the algorithm before in terms of solution performance and solution set ***/value-Based on the actual situation,this paper considers the operation mode of flight *** addition,the flight plan solved by the model can be guaranteed in terms of feasibility and effectiveness,which can provide airlines with reasonable decision-making opinions when reassigning slot resources.

关键词： Flight delay Collaborative decision-making Slot secondary assignment Flight wave Improved adaptive partheno-genetic algorithm

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

中小型制造企业的工业软件选型方法

无线互联科技 2024年第8期21卷 96-99页

作者：傅利玉胡进伟许可嘉广东中认华南检测技术有限公司广东中山528427 中国质量认证中心北京100073

中小企业在我国企业中的数量占比最高,加快中小企业的数字化信息化改造对于全面推进我国制造业高质量发展具有重要意义。工业软件是制造业信息化改造的关键支撑。文章介绍了当前主流工业软件的分类,分析了中小型制造企业的规模特征、活... 详细信息

中小企业在我国企业中的数量占比最高,加快中小企业的数字化信息化改造对于全面推进我国制造业高质量发展具有重要意义。工业软件是制造业信息化改造的关键支撑。文章介绍了当前主流工业软件的分类,分析了中小型制造企业的规模特征、活动特征和数字化基础特征,从行业、成本和痛点3个角度给出了中小型制造企业的工业软件选型建议,帮助企业明确技改目标,规划升级路径,以较好的效益、较低的成本实现数字化水平的提升。

关键词：中小企业制造业工业软件选型

维普期刊数据库博看期刊

在线全文

学校读者我要写书评

暂无评论

不锈钢市场产品质量状况分析报告

中国质量 2024年第6期 124-127页

作者：韩克甲侯英麟曹颖孟林国家泵类产品质量检验检测中心淄博市产品质量检验研究院

本文对不锈钢市场行业特点和市场内产品质量状况进行了介绍，并对不锈钢市场存在的问题进行了分析研究，给出了不锈钢市场产品质量提升建议和消费者使用指南。

关键词：不锈钢市场不锈钢产品产业分析质量提升

Grey clustering evaluation based on AHP and interval grey number

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

International Journal of Intelligent Computing and Cybernetics 2019年第1期12卷 127-137页

作者： kejia Chen Ping Chen Lixi Yang Lian Jin School of Economics and Management Fuzhou UniversityFuzhouChina

Purpose–The purpose of this paper is to propose a grey clustering evaluation model based on analytic hierarchy process(AHP)and interval grey number(IGN)to solve the clustering evaluation problem with ***/methodology/approach–First,the centre-point triangular whitenisation weight function with real numbers is built,and then by using interval mean function,the whitenisation weight function is extended to *** weights of evaluation indexes are determined by ***,this model is used to evaluate the flight safety of a Chinese *** results indicate that the model is effective and ***–When IGN meets certain conditions,the centre-point triangular whitenisation weight function based on IGN is not multiple-cross and it is *** provides a certain standard and basis for obtaining the effective evaluation indexes and determining the scientific evaluation of the grey ***/value–The traditional grey clustering model is extended to the field of *** can make full use of all the information of the IGN,so the result of the evaluation is more objective and reasonable,which provides supports for solving practical problems.

关键词： Grey clustering Interval grey number Whitenisation weight function,Analytic hierarchy process(AHP)