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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
Qinghua Daxue Xuebao/Journal of Tsinghua University 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
{"title":"Defect detection in the graphite components and carbon bricks in high temperature gas-cooled reactors using helical CT","authors":"L. Renjie, Sun Yuewen, Li Ximing, Miao Jichen, Zhou Liye, Cong Peng","doi":"10.16511/J.CNKI.QHDXXB.2021.25.027","DOIUrl":"https://doi.org/10.16511/J.CNKI.QHDXXB.2021.25.027","url":null,"abstract":"","PeriodicalId":52422,"journal":{"name":"Qinghua Daxue Xuebao/Journal of Tsinghua University","volume":"53 1","pages":"367-376"},"PeriodicalIF":0.0,"publicationDate":"2021-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74459098","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
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
Qinghua Daxue Xuebao/Journal of Tsinghua University Pub Date : 2021-03-06 DOI: 10.16511/J.CNKI.QHDXXB.2020.26.012
Hou Senhao, Tang Xiaoqiang, Sun Haining, Cui Zhiwei, Wang Dianjun
{"title":"Transfer characteristics of high-speed cable forces for spacecraft separation","authors":"Hou Senhao, Tang Xiaoqiang, Sun Haining, Cui Zhiwei, Wang Dianjun","doi":"10.16511/J.CNKI.QHDXXB.2020.26.012","DOIUrl":"https://doi.org/10.16511/J.CNKI.QHDXXB.2020.26.012","url":null,"abstract":"","PeriodicalId":52422,"journal":{"name":"Qinghua Daxue Xuebao/Journal of Tsinghua University","volume":"53 1","pages":"177-182"},"PeriodicalIF":0.0,"publicationDate":"2021-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84709724","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
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
Qinghua Daxue Xuebao/Journal of Tsinghua University Pub Date : 2021-03-06 DOI: 10.16511/J.CNKI.QHDXXB.2020.26.027
Peng Fazhong, Duan Jinhao, Shao Zhufeng, Zhang Zhaokun, Wang Daoming
{"title":"Comparisons of a TBot high-speed cable-driven parallel robot with a classical Delta parallel robot","authors":"Peng Fazhong, Duan Jinhao, Shao Zhufeng, Zhang Zhaokun, Wang Daoming","doi":"10.16511/J.CNKI.QHDXXB.2020.26.027","DOIUrl":"https://doi.org/10.16511/J.CNKI.QHDXXB.2020.26.027","url":null,"abstract":"","PeriodicalId":52422,"journal":{"name":"Qinghua Daxue Xuebao/Journal of Tsinghua University","volume":"258 1","pages":"183-192"},"PeriodicalIF":0.0,"publicationDate":"2021-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82955804","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
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
Qinghua Daxue Xuebao/Journal of Tsinghua University 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
Qinghua Daxue Xuebao/Journal of Tsinghua University Pub Date : 2021-03-06 DOI: 10.16511/J.CNKI.QHDXXB.2020.22.024
Liu Hongma, Wang Shengjin
{"title":"EEG classification based on a match filter and metric learning","authors":"Liu Hongma, Wang Shengjin","doi":"10.16511/J.CNKI.QHDXXB.2020.22.024","DOIUrl":"https://doi.org/10.16511/J.CNKI.QHDXXB.2020.22.024","url":null,"abstract":"","PeriodicalId":52422,"journal":{"name":"Qinghua Daxue Xuebao/Journal of Tsinghua University","volume":"417 1","pages":"248-253"},"PeriodicalIF":0.0,"publicationDate":"2021-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79651313","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
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
Qinghua Daxue Xuebao/Journal of Tsinghua University Pub Date : 2021-01-01 DOI: 10.16511/J.CNKI.QHDXXB.2020.21.017
X. Kong, N. Liu, Ming Zhang, M. Xu
{"title":"Analysis of online college teaching data before and after the COVID-19 epidemic","authors":"X. Kong, N. Liu, Ming Zhang, M. Xu","doi":"10.16511/J.CNKI.QHDXXB.2020.21.017","DOIUrl":"https://doi.org/10.16511/J.CNKI.QHDXXB.2020.21.017","url":null,"abstract":"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","PeriodicalId":52422,"journal":{"name":"Qinghua Daxue Xuebao/Journal of Tsinghua University","volume":"27 1","pages":"104-116"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82551968","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: 2
Effects of social isolation on COVID-19 trends 社会隔离对COVID-19趋势的影响
Qinghua Daxue Xuebao/Journal of Tsinghua University Pub Date : 2020-12-29 DOI: 10.16511/J.CNKI.QHDXXB.2021.21.001
Huang Mengyao, Huang Lida, Yuan Hongyong, L. Gang
{"title":"Effects of social isolation on COVID-19 trends","authors":"Huang Mengyao, Huang Lida, Yuan Hongyong, L. Gang","doi":"10.16511/J.CNKI.QHDXXB.2021.21.001","DOIUrl":"https://doi.org/10.16511/J.CNKI.QHDXXB.2021.21.001","url":null,"abstract":"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","PeriodicalId":52422,"journal":{"name":"Qinghua Daxue Xuebao/Journal of Tsinghua University","volume":"147 1","pages":"96-103"},"PeriodicalIF":0.0,"publicationDate":"2020-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77469008","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: 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
Qinghua Daxue Xuebao/Journal of Tsinghua University Pub Date : 2020-12-29 DOI: 10.16511/J.CNKI.QHDXXB.2020.21.020
Qiu Tong, C. Xiangsheng, S. Dong
{"title":"Comprehensive, resilient disaster and pandemic prevention construction framework for urban underground spaces","authors":"Qiu Tong, C. Xiangsheng, S. Dong","doi":"10.16511/J.CNKI.QHDXXB.2020.21.020","DOIUrl":"https://doi.org/10.16511/J.CNKI.QHDXXB.2020.21.020","url":null,"abstract":"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","PeriodicalId":52422,"journal":{"name":"Qinghua Daxue Xuebao/Journal of Tsinghua University","volume":"54 42 1","pages":"117-127"},"PeriodicalIF":0.0,"publicationDate":"2020-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83292873","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
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
Qinghua Daxue Xuebao/Journal of Tsinghua University Pub Date : 2020-12-29 DOI: 10.16511/J.CNKI.QHDXXB.2020.22.030
Guo Hongling, Zhou Ying, YE Xiaotian, Luo Zhubang, Xue Fan
{"title":"Automated mapping from an IFC data model to a relational database model","authors":"Guo Hongling, Zhou Ying, YE Xiaotian, Luo Zhubang, Xue Fan","doi":"10.16511/J.CNKI.QHDXXB.2020.22.030","DOIUrl":"https://doi.org/10.16511/J.CNKI.QHDXXB.2020.22.030","url":null,"abstract":"","PeriodicalId":52422,"journal":{"name":"Qinghua Daxue Xuebao/Journal of Tsinghua University","volume":"3 1","pages":"152-160"},"PeriodicalIF":0.0,"publicationDate":"2020-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89020581","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: 3
Review of uranium separation and enrichment methods in water 水中铀分离富集方法综述
Qinghua Daxue Xuebao/Journal of Tsinghua University Pub Date : 2020-11-26 DOI: 10.16511/J.CNKI.QHDXXB.2020.21.011
Xiangwei Wang, Manchun Liang, Gang Li, Shuijun He
{"title":"Review of uranium separation and enrichment methods in water","authors":"Xiangwei Wang, Manchun Liang, Gang Li, Shuijun He","doi":"10.16511/J.CNKI.QHDXXB.2020.21.011","DOIUrl":"https://doi.org/10.16511/J.CNKI.QHDXXB.2020.21.011","url":null,"abstract":"","PeriodicalId":52422,"journal":{"name":"Qinghua Daxue Xuebao/Journal of Tsinghua University","volume":"24 1","pages":"64-69"},"PeriodicalIF":0.0,"publicationDate":"2020-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85358903","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
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