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侧墙上置/下置风口置换通风特性的数值计算

上海节能 2024年第10期 1704-1709页

作者：吴兆波高驰国际设计有限公司济南分公司

建立了侧墙上置风口置换通风与侧墙下置风口置换通风的办公室模型,并对其进行了数值计算,分析了室内工作区空气温度、速度的分布特性,并比较了两种置换送风口布置方式的温度不均匀系数、速度不均匀系数及通风效率。结果表明,在室内冷负... 详细信息

建立了侧墙上置风口置换通风与侧墙下置风口置换通风的办公室模型,并对其进行了数值计算,分析了室内工作区空气温度、速度的分布特性,并比较了两种置换送风口布置方式的温度不均匀系数、速度不均匀系数及通风效率。结果表明,在室内冷负荷及送风参数相同的条件下,与侧墙下置风口置换通风相比,侧墙上置风口置换通风的工作区温度低0.7℃左右,且温度分布均匀性更好,但通风效率低10%。

关键词：置换通风温度不均匀系数速度不均匀系数通风效率

焊缝填充量对15Cr2Mo1耐热钢焊接修复性能的影响

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焊接 2024年第9期 56-61页

作者：晏嘉陵齐彦昌刘明星常子金吴赵波崔冰中国大唐集团科学技术研究总院有限公司华东电力试验研究院合肥230088 大唐锅炉压力容器检验中心有限公司合肥230088 钢铁研究总院焊接研究所北京100081 安徽工业大学安徽马鞍山243000

【目的】15Cr2Mo1钢属于珠光体耐热钢,在电力和石化等领域应用广泛。但是在长期的使用过程中经常会出现某些区域的裂纹等问题。而补焊工艺具有操作难度不高、代价低和复原能力好等优点。该文旨在揭示焊接修补填充量对焊接接头性能的影... 详细信息

【目的】15Cr2Mo1钢属于珠光体耐热钢,在电力和石化等领域应用广泛。但是在长期的使用过程中经常会出现某些区域的裂纹等问题。而补焊工艺具有操作难度不高、代价低和复原能力好等优点。该文旨在揭示焊接修补填充量对焊接接头性能的影响。【方法】采用镍基合金焊条对15Cr2Mo1耐热钢进行不同结构类型和不同坡口类型的补焊试验。【结果】研究结果表明,坡口深度为6.5 mm,13 mm和19.5 mm时,补焊接头的补焊区各焊道布置合理且接头各区域均不存在明显缺陷;3种填充量下的补焊区焊缝组织均为奥氏体组织,晶内析出物呈颗粒状;在原始焊缝区和补焊区之间的熔合区发现有宽度约为15μm过渡层,线扫结果表明,大量奥氏体化元素Ni,Cr,Mn进入该区域,使得该区域的淬硬倾向增加。【结论】3种填充量下的补焊接头均能保持较好的强韧匹配。

关键词： 15Cr2Mo1耐热钢补焊填充量 ENiCrFe-3

Single-nucleus transcriptomic profiling of multiple organs in a rhesus macaque model of SARS-CoV-2 infection

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Zoological Research 2022年第6期43卷 1041-1062页

作者： Qiang Ma Wenji Ma Tian-Zhang Song zhaobo wu Zeyuan Liu Zhenxiang Hu Jian-Bao Han Ling Xu Bo Zeng Bosong Wang Yinuo Sun Dan-Dan Yu Qian wu Yong-Gang Yao Yong-Tang Zheng Xiaoqun Wang State Key Laboratory of Brain and Cognitive Science Institute of BiophysicsChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Animal Models and Human Disease Mechanisms of the Chinese Academy of Sciences KIZ-CUHK Joint Laboratory of Bioresources and Molecular Research in Common DiseasesKunming Institute of ZoologyChinese Academy of SciencesKunmingYunnan 650223China Kunming National High-Level Biosafety Research Center for Non-Human Primates Center for Biosafety Mega-ScienceKunming Institute of ZoologyChinese Academy of SciencesKunmingYunnan 650107China National Resource Center for Non-Human Primates National Research Facility for Phenotypic&Genetic Analysis of Model Animals(Primate Facility)Kunming Institute of ZoologyChinese Academy of SciencesKunmingYunnan 650107China LivzonBio Inc.ZhuhaiGuangdong 519045China State Key Laboratory of Cognitive Neuroscience and Learning Beijing Normal UniversityBeijing 100875China IDG/McGovern Institute for Brain Research Beijing Normal UniversityBeijing 100875China Advanced Innovation Center for Human Brain Protection Beijing Institute for Brain DisordersCapital Medical UniversityBeijing 100069China

Infection with severe acute respiratory syndrome coronavirus 2(SARS-CoV-2) causes diverse clinical manifestations and tissue injuries in multiple ***, cellular and molecular understanding of SARS-CoV-2 infection-associated pathology and immune defense features in different organs remains incomplete. Here, we profiled approximately 77 000single-nucleus transcriptomes of the lung, liver,kidney, and cerebral cortex in rhesus macaques(Macaca mulatta) infected with SARS-CoV-2 and healthy controls. Integrated analysis of the multiorgan dataset suggested that the liver harbored the strongest global transcriptional alterations. We observed prominent impairment in lung epithelial cells, especially in AT2 and ciliated cells, and evident signs of fibrosis in fibroblasts. These lung injury characteristics are similar to those reported in patients with coronavirus disease 2019(COVID-19).Furthermore, we found suppressed MHC class I/II molecular activity in the lung, inflammatory response in the liver, and activation of the kynurenine pathway,which induced the development of an immunosuppressive microenvironment. Analysis of the kidney dataset highlighted tropism of tubule cells to SARS-CoV-2, and we found membranous nephropathy(an autoimmune disease) caused by podocyte dysregulation. In addition, we identified the pathological states of astrocytes and oligodendrocytes in the cerebral cortex, providing molecular insights into COVID-19-related neurological implications. Overall, our multi-organ single-nucleus transcriptomic survey of SARS-CoV-2-infected rhesus macaques broadens our understanding of disease features and antiviral immune defects caused by SARS-CoV-2 infection,which may facilitate the development of therapeutic interventions for COVID-19.

关键词： SARS-CoV-2 Rhesus macaque Animal model Single-nucleus RNA sequencing Antiviral immune defects Multiple organs

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乾隆皇帝与北海琼华岛

北京档案 2005年第9期 46-48页

作者：吴兆波中国第一历史档案馆

今年8月1日,在庆祝北海公园正式开放80周年之时,北海琼华岛迎来历史上规模最大的全面修复.据媒体报道,琼华岛修缮要恢复到清代乾隆时期的历史风貌.乾隆时期琼华岛究竟新建了哪些建筑?为什么乾隆帝对琼华岛情有独钟呢?

关键词：乾隆皇帝清代北海琼华岛修复工作历史考证历史档案

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乾隆皇帝与圆明园

北京档案 2005年第11期 48-50页

作者：吴兆波中国第一历史档案馆

圆明园湖底防渗漏工程在全社会的关注下,终于在九月初完成.干涸了近一年的湖区开始注水,游船在今年'十一'国庆节正式下水,喜迎八方来客.圆明园是一座水景园,水面约占全部面积的近一半,园内分布着大型水面'福海'、中型水面'后湖',以及众... 详细信息

圆明园湖底防渗漏工程在全社会的关注下,终于在九月初完成.干涸了近一年的湖区开始注水,游船在今年'十一'国庆节正式下水,喜迎八方来客.圆明园是一座水景园,水面约占全部面积的近一半,园内分布着大型水面'福海'、中型水面'后湖',以及众多的小型水面.回环萦绕的河道把大大小小的水面联为完整的河湖水系,成为水上畅游通路.在湖光山影中,园内分布着140多个景点,汇集了天下胜景和名园的精华.一座座殿堂与大自然完美有序地结合在一起,使最佳生态环境、完美景观与心理空间三者之间达到统一.

关键词：圆明园乾隆皇帝 “十一”国庆节水面面积

Research Progress of High Entropy Ceramic Materials

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Research and Application of Materials Science 2024年第1期6卷 16-22页

作者： Song wu Shikai LIU Jialin WANG Bibo HAN Shaoyi SHEN Zhigang YU zhaobo ZHANG Xinhua ZHENG School of Materials Science and Engineering Henan University of TechnologyZhengzhouHenan450001China

High-entropy materials(HEMs)have better mechanical,thermal,and electrical properties than traditional materials due to their special"high entropy effect".They can also adjust the performance of high entropy ceramics by adjusting the proportion of raw materials,and have broad application prospects in many *** article provides a review of the high entropy effect,preparation methods,and main applications of high entropy ceramic materials,especially exploring relevant research on high entropy perovskite *** is expected to provide reference for the promotion of scientific research and the development of further large-scale applications of high-entropy ceramic materials.

关键词： High-entropy ceramic materials high entropy effect preparation method perovskite structure research prog

维普期刊数据库评论

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GCr15轴承套圈缺陷成因分析

物理测试 2021年第6期39卷 22-27页

作者：吴赵波李南钢铁研究总院中心实验室北京100081

针对某厂生产的GCr15轴承套圈在精加工后表面产生缺陷的问题,利用光学显微镜(OM)、扫描电镜(SEM)、能谱分析(EDS)及显微硬度测定等方法对其进行综合分析。结果表明:不合格轴承套圈表面缺陷产生于热处理工艺前,为腐蚀坑。由于该批轴承套... 详细信息

针对某厂生产的GCr15轴承套圈在精加工后表面产生缺陷的问题,利用光学显微镜(OM)、扫描电镜(SEM)、能谱分析(EDS)及显微硬度测定等方法对其进行综合分析。结果表明:不合格轴承套圈表面缺陷产生于热处理工艺前,为腐蚀坑。由于该批轴承套圈在热处理前曾在防锈液中长期存放,推测在此期间发生腐蚀形成腐蚀坑,此外原材料中存在的疏松,在机加工过程后暴露于轴承样品表面,使得腐蚀更加易于发生,同时在热处理之前零件烘烤不充分,导致热处理过程中缺陷位置发生脱碳。

关键词： GCr15 缺陷热处理脱碳

Ballistic performances of the hourglass lattice sandwich structures under high-velocity fragments

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Defence Technology（防务技术） 2024年第1期31卷 312-325页

作者： He-xiang wu Jia Qu Lin-zhi wu Key Laboratory of Advanced Ship Materials and Mechanics College of Aerospace and Civil EngineeringHarbin Engineering UniversityHarbin150001China School of Civil Engineering Northeast Forestry UniversityHarbin150040China

In this paper,the numerical simulation method is used to study the ballistic performances of hourglass lattice sandwich structures with the same mass under the vertical incidence of *** is paid to elucidating the influences of rod cross-section dimensions,structure height,structure layer,and rod inclination angle on the deformation mode,ballistic performances,and ability to change the ballistic direction of *** results show that the ballistic performances of hourglass lattice sandwich structures are mainly affected by their structural *** this respect,structural parameters optimization of the hourglass lattice sandwich structures enable one to effectively improve their ballistic limit velocity and,consequently,ballistic performances.

关键词： Hourglass lattice sandwich structures Ballistic performances high-velocity Finite element analysis

Resilience-incorporated seismic risk assessment of precast concrete frames with“dry”connections

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Earthquake Engineering and Engineering Vibration 2024年第2期23卷 403-425页

作者： wu Chenhao Tang Yuchuan Cao Xuyang wu Gang Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education Nanjing 211102China Department of Civil and Environmental Engineering University of CaliforniaLos AngelesCA 90095USA School of Civil Engineering Southeast UniversityNanjing 211102China College of Civil and Transportation Engineering Hohai UniversityNanjing 210024China

A resilience-incorporated risk assessment framework is proposed and demonstrated in this study to manifest the advantageous seismic resilience of precast concrete frame(PCF)structures with“dry”connections in terms of their low damage and rapid *** framework integrates various uncertainties in the seismic hazard,fragility,capacity,demand,loss functions,and post-earthquake *** this study,the PCF structures are distinguished from ordinary reinforced concrete frame(RCF)structures by characterizing multiple limit states for the PCF based on its unique damage ***,probabilistic story-wise pushover analyses are performed to yield story-wise capacities for the predefined limit *** the seismic resilience analysis,a step-wise recovery model is proposed to idealize the functionality recovery process,with separate considerations of the repair and non-repair *** recovery model leverages the economic loss and downtime to delineate the stochastic post-earthquake recovery curves for the resilience loss *** such,contingencies in the probabilistic post-earthquake repairs are incorporated and the empirical judgments on the recovery parameters are largely *** proposed framework is demonstrated through a comparative study between two“dry”connected PCFs and one RCF designed as alternative structural systems for a prototype *** results from the risk quantification indicate that the PCFs show reduced loss hazards and lower expected losses relative to the ***,the PCF equipped with energy dissipation devices at the“dry”connections largely reduces the expected economic loss,downtime,and resilience loss by 29%,56%,and 60%,respectively,compared to the RCF.

关键词： precast concrete frame non-emulative precast system seismic resilience seismic risk functional recovery