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Defect detection in the graphite components and carbon bricks in high temperature gas-cooled reactors using helical CT 高温气冷堆中石墨构件和碳砖的螺旋CT缺陷检测
Q3 Engineering Pub Date : 2021-04-16 DOI: 10.16511/J.CNKI.QHDXXB.2021.25.027
L. Renjie, Sun Yuewen, Li Ximing, Miao Jichen, Zhou Liye, Cong Peng
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引用次数: 0
Transfer characteristics of high-speed cable forces for spacecraft separation 航天器分离高速索力传递特性研究
Q3 Engineering Pub Date : 2021-03-06 DOI: 10.16511/J.CNKI.QHDXXB.2020.26.012
Hou Senhao, Tang Xiaoqiang, Sun Haining, Cui Zhiwei, Wang Dianjun
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引用次数: 0
Comparisons of a TBot high-speed cable-driven parallel robot with a classical Delta parallel robot TBot高速缆索驱动并联机器人与经典Delta并联机器人的比较
Q3 Engineering Pub Date : 2021-03-06 DOI: 10.16511/J.CNKI.QHDXXB.2020.26.027
Peng Fazhong, Duan Jinhao, Shao Zhufeng, Zhang Zhaokun, Wang Daoming
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引用次数: 0
Kinematics analysis and control of under-constrained cable-driven parallel suspension systems 欠约束缆索驱动并联悬架系统的运动学分析与控制
Q3 Engineering Pub Date : 2021-03-06 DOI: 10.16511/J.CNKI.QHDXXB.2020.26.026
W. Xiaoguang, Wu Jun, Lin Qi
{"title":"Kinematics analysis and control of under-constrained cable-driven parallel suspension systems","authors":"W. Xiaoguang, Wu Jun, Lin Qi","doi":"10.16511/J.CNKI.QHDXXB.2020.26.026","DOIUrl":"https://doi.org/10.16511/J.CNKI.QHDXXB.2020.26.026","url":null,"abstract":"","PeriodicalId":52422,"journal":{"name":"Qinghua Daxue Xuebao/Journal of Tsinghua University","volume":"35 1","pages":"193-201"},"PeriodicalIF":0.0,"publicationDate":"2021-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75591431","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
EEG classification based on a match filter and metric learning 基于匹配滤波和度量学习的脑电分类
Q3 Engineering Pub Date : 2021-03-06 DOI: 10.16511/J.CNKI.QHDXXB.2020.22.024
Liu Hongma, Wang Shengjin
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引用次数: 0
Analysis of online college teaching data before and after the COVID-19 epidemic 新冠肺炎疫情前后高校网络教学数据分析
Q3 Engineering Pub Date : 2021-01-01 DOI: 10.16511/J.CNKI.QHDXXB.2020.21.017
X. Kong, N. Liu, Ming Zhang, M. Xu
The corona virus disease 2019 (COVID-19) pandemic has led Chinese universities to turn to online teaching Several researchers have used surveys to study the characteristics and challenges of online teaching However, these surveys inevitably included subjective bias and sample limitations This study analyzed the server logs of the Tsinghua University course selection system during online teaching with comparisons with those of the past two years Since all students must visit the course selection system every semester, the server logs track the students' learning and living habits After data cleaning, visualization and analysis, the logs show that over 98% of the sessions came from outside the campus during the epidemic The number of visits to the system decreased by 25%-47%, the number of visits originating from mobile devices decreased by 7%, and the average browsing time per visit declined by 8% Thus, this study shows evidence that online teaching leads to a notable decline in student engagement with the system This study then suggests that colleges pay more attention to the student's productivity and engagement, thereby improving the quality of teaching © 2021, Tsinghua University Press All right reserved
2019冠状病毒病(COVID-19)大流行导致中国大学转向在线教学,一些研究人员通过调查来研究在线教学的特点和挑战。本研究对清华大学选课系统在网络教学过程中的服务器日志进行了分析,并与过去两年进行了对比。由于所有学生每学期都必须访问选课系统,因此服务器日志跟踪了学生的学习和生活习惯,经过数据清洗、可视化和分析,日志显示,超过98%的课程来自外校园流行期间访问系统的数量下降了25% -47%,来自移动设备访问的数量减少了7%,而平均浏览时间每次因此下降了8%,这项研究的证据表明,网络教学会导致显著下降的学生参与系统这一研究表明,大学更加注重学生的生产力和交往,©2021,清华大学出版社版权所有
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引用次数: 2
Effects of social isolation on COVID-19 trends 社会隔离对COVID-19趋势的影响
Q3 Engineering Pub Date : 2020-12-29 DOI: 10.16511/J.CNKI.QHDXXB.2021.21.001
Huang Mengyao, Huang Lida, Yuan Hongyong, L. Gang
Social isolation is the most common and effective way to control disease transmission during pandemics with the specific implementations great impacting the results This study used the SEIRS model to analyze the pandemic conditions in 4 countries to investigate the effectiveness of various social isolation schemes on the spread of the corona virus disease 2019 (COVID-19) to prepare for additional future outbreaks with emphasis on the effects of the isolation duration and degree The results show that for short-term social isolation, longer isolation time and lower isolation degree worked better for countries with good medical facilities and small populations while shorter isolation time and higher isolation degree worked better for countries with general medical facilities and large populations For long-term social isolation until COVID-19 is disappeared, a 50% degree of isolation provided effective results Overall, long-term social isolation is more effective than short-term isolation © 2021, Tsinghua University Press All right reserved
社会隔离是流行病期间控制疾病传播的最常见和最有效的方法,具体实施方式对结果影响很大。本研究利用SEIRS模型分析了4个国家的大流行情况,研究了各种社会隔离方案对2019冠状病毒病(COVID-19)传播的有效性,为未来更多的疫情做好准备,重点研究了隔离时间和程度的影响对于短期社会隔离而言,较长的隔离时间和较低的隔离程度对于医疗设施好、人口少的国家效果更好;对于医疗设施一般、人口多的国家,较短的隔离时间和较高的隔离程度效果更好;对于长期社会隔离,直到COVID-19消失,50%的隔离程度提供了有效效果。长期社会隔离比短期隔离更有效©2021,清华大学出版社版权所有
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引用次数: 1
Comprehensive, resilient disaster and pandemic prevention construction framework for urban underground spaces 城市地下空间综合抗灾抗疫建设框架
Q3 Engineering Pub Date : 2020-12-29 DOI: 10.16511/J.CNKI.QHDXXB.2020.21.020
Qiu Tong, C. Xiangsheng, S. Dong
After the corona virus disease 2019 (COVID-19) outbreak in late 2019, civil engineering will play important roles in the urban comprehensive, resilient disaster and pandemic prevention construction This paper combines the demand for urban pandemic prevention and control in China with the advantages of urban underground spaces for disaster prevention and pandemic responses in a comprehensive development plan Emergency responses and pandemic control in urban underground spaces can provide safety, stability, adaptability to emergency medical conditions, low energy consumption underground emergency material storage, unified dispatching of emergency resources, and adaptability to urban development An evaluation framework is given for urban underground space disaster and pandemic prevention to evaluate the resilience of such measures The advantages of using urban underground spaces are illustrated by comparisons with other systems The four topics, "stock", "increment", "variable" and "unified dispatching" in the disaster and pandemic prevention, are discussed to develop a resilience construction framework for urban underground spaces Then, a comprehensive, resilient disaster and pandemic prevention construction framework for urban underground spaces is proposed to provide reference for the construction of resilient cities and urban underground spaces © 2021, Tsinghua University Press All right reserved
2019年底2019冠状病毒病(COVID-19)疫情爆发后,土木工程将在城市综合防灾抗灾抗疫建设中发挥重要作用。本文结合中国城市疫情防控需求,结合城市地下空间在综合发展规划中防灾抗灾抗疫的优势,提出城市地下空间应急抗灾抗疫可提供安全保障;稳定性、应急医疗条件适应性、低能耗地下应急物资储存、应急资源统一调度、城市发展适应性等方面,给出了城市地下空间灾害与流行病防治弹性评价框架,通过与其他系统的对比,说明了城市地下空间利用的优势。探讨灾害防控中的“可变”与“统一调度”,构建城市地下空间弹性建设框架,进而提出城市地下空间综合弹性建设框架,为弹性城市与城市地下空间建设提供参考©2021,清华大学出版社版权所有
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引用次数: 0
Automated mapping from an IFC data model to a relational database model 从IFC数据模型到关系数据库模型的自动映射
Q3 Engineering Pub Date : 2020-12-29 DOI: 10.16511/J.CNKI.QHDXXB.2020.22.030
Guo Hongling, Zhou Ying, YE Xiaotian, Luo Zhubang, Xue Fan
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引用次数: 3
Review of uranium separation and enrichment methods in water 水中铀分离富集方法综述
Q3 Engineering Pub Date : 2020-11-26 DOI: 10.16511/J.CNKI.QHDXXB.2020.21.011
Xiangwei Wang, Manchun Liang, Gang Li, Shuijun He
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引用次数: 0
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