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Self-centering steel plate shear walls for improving seismic resilience

Frontiers of Structural and Civil Engineering 2016年第3期10卷 283-290页

作者： Patricia M. CLAYTON Daniel M. DOwDEN Chao-Hsien LI Jeffrey w. BERMAN Michel BRUNEAU Laura N. LOwES Keh-Chuan TSAI Department of Civil Architectural and Environmental Engineering University of Texas at Austin Austin TX 78705 USA Department of Civil Structural and Environmental Engineering University at Buffalo New York 14260-1660 USA National Center for Research on Earthquake Engineering Taipei Taiwan China Department of Civil and Environmental Engineering University of Washington Seattle WA 98195-2700 USA Department of Civil Structural and Environmental Engineering Taiwan University Taipei Taiwan China

As part of a Network for Earthquake Engineering Simulation research project led by researchers at the University of washington with collaborators at University at Buffalo, and Taiwan National Center for Research on Earthquake Engineering, a self-centering steel plate shear wall （SC-SPSw） system has been developed to achieve enhanced seismic performance objectives, including recentering. The SC-SPSw consists of thin steel infill panels, referred to as web plates that serve as the primary lateral load-resisting and energy dissipating element of the system. Post- tensioned （PT） beam-to-column connections provide system recentering capabilities. A performance-based design procedure has been developed for the SC-SPSw, and a series of nonlinear response history analyses have been conducted to verify intended seismic performance at multiple hazard levels. Quasi-static subassembly tests, quasi-static and shake table tests of scaled three-story specimens, and pseudo-dynamic tests of two full-scale two-story SC-SPSws have been conducted. As a culmination of this multi-year, multi-institutional project, this paper will present an overview of the SC- SPSw numerical and experimental research programs. This paper will also discuss innovative PT connection and web plate designs that were investigated to improve constructability, resilience, and seismic performance and that can be applied to other self-centering and steel plate shear wall systems.

关键词： self-centering steel plate shear walls large-scale experiment post-tensioned connections performance-baseddesign

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Lysozyme as an alternative to growth promoting antibiotics in swine production

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Journal of Animal Science and Biotechnology 2016年第1期7卷 34-40页

作者： w. T. Oliver J.E.wells USDA ARS U.S. Meat Animal Research Center P. O. Box 166 Clay Center NE68933-0166 USA

Lysozyme is a naturally occurring enzyme found in bodily secretions such as tears, saliva, and milk. It functions as an antimicrobial agent by cleaving the peptidoglycan component of bacterial cell walls, which leads to cell death. Antibiotics are also antimicrobials and have been fed at subtherapeutic levels to swine as growth promoters. These compounds benefit swine producers by minimizing production losses by increasing feed efficiency and decreasing susceptibility to bacterial infection and disease. This manuscript reviews the knowledge of the effects of lysozyme, as compared to traditional subtherapeutic antibiotics in swine feed, on pig performance and health. It is clear from decades of studies that antibiotic use in feeds increases pig performance, particularly in the nursery. Similarly, lysozyme, as a feed additive, increases growth and feed efficiency. while the mechanism by which antibiotics and lysozyme improve performance is not clearly understood, both of these feed additives improve gastrointestinal health, improve the metabolic profile, and alter the gastrointestinal bacteria ecology of swine. Therefore, lysozyme is a suitable alternative to growth-promoting subtherapeutic antibiotic use in swine feed.

关键词： Antibiotics Gastrointestinal Lysozyme Microbiota Review Swine

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硬着颈项的人

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作者： (美)珍妮特·沃尔斯(Jeannette walls)

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玻璃城堡

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作者： (美)珍妮特·沃尔斯(Jeannette walls)

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银星勋章

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作者： (美)珍妮特·沃尔斯(Jeannette walls)

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Deformation kinking and highly localized nanocrystallization in metastableβ-Ti alloys using cold forging

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Journal of Materials Science & Technology 2022年第25期120卷 53-64页

作者： Keer Li w.Chen G.X.Yu J.Y.Zhang S.w.Xin J.X.Liu X.X.wang J.Sun State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China Northwest Institute for Nonferrous Metal Research Xi’an 710016China Baoji Titanium Industry Co. Ltd.Baoji 721014China

Deformation kinking as an uncommon plastic deformation mechanism has been reported in several materials while the relevant microstructure evolution and grain refinement behavior at a large strain remain unclear so *** this study,the issue was systematically investigated by utilizing cold forging to impose severe plastic deformation(SPD)on Ti-11 V metastableβ-Ti *** is found that the formation of kink bands experiences dislocation gliding,pre-kinking and the ripening of pre-kinks in *** kink bands are subsequently thickened through the coalescence of multiple kink bands in a manner of high *** dislocation slip is developed as a dominant deformation mechanism when deformation kinking is *** resulting grain refinement involves transverse breakdown and longitudinal splitting of dislocation walls and cells,which fragment kink bands into smallβ-*** refinement of theβ-blocks is still governed by dislocation activities,and finally nanograins with a diameter of~15 nm are produced at a large strain of ***,it is revealed that nanocrystallization is highly localized inside kink bands while the outer microstructure maintains original coarse *** localized refinement characterization is ascribed to the intrinsic soft nature of kink bands,shown as low hardness in nanoindentation *** intrinsic softening of kink bands is uncovered to originate from the inner degraded dislocation density evidenced by both experimental measurement and theoretical *** findings enrich fundamental understanding of deformation kinking,and shed some light on exploring the deformation accommodation mechanisms for metal materials at large strains.

关键词： Metastableβ-Ti alloys Deformation kinking Microstructural evolution Grain refinement Dislocations

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低噪声频率综合

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现代雷达 1989年第6期11卷 47-54,16页

作者： F.L.walls C.M.Felton 韦传安 Time and Frequency Division Nat-ional Bureau of Standards Felton Electronics Design 美国

本文综述了相位噪声的各种定义和经无噪声倍频、分频和变频后相位噪声的变化。其次综述了非致冷参考频率(rf)和微波振荡器的相位噪声。利用系统方法可以综合出一个微波信号,其近载频相位噪声受一个低频石英振荡器的控制,而高频相位噪声... 详细信息

本文综述了相位噪声的各种定义和经无噪声倍频、分频和变频后相位噪声的变化。其次综述了非致冷参考频率(rf)和微波振荡器的相位噪声。利用系统方法可以综合出一个微波信号,其近载频相位噪声受一个低频石英振荡器的控制,而高频相位噪声则受微波源的控制。用这种方法比用单个源可能得到的相位噪声性能优越。最后,比较了各种放大器、倍频器和分频器的相位噪声。虽然,分频器的相位噪声一般地比最好的倍频器要差,但是对大多数应用来说通常是足够了。应当特别指出两点,其一是对某些分频器,文献中引用的相位噪声或许悲观,其二是如果处于振动热应力条件下,系统的相位噪声常常会受到严重的影响。

关键词：低噪声频率综合相位噪声

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Diagnosis of bile duct hepatocellular carcinoma thrombus without obvious intrahepatic mass

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world Journal of Gastroenterology 2010年第39期16卷 4998-5004页

作者： Long XY Li YX wu w Li L Cao J. Department of General Surgery Xiangya Hospital Central South University Changsha 410008 Hunan Province China. liyixiong6@***

AIM:To study the diagnosis of hepatocellular carcinoma(HCC)presenting as bile duct tumor thrombus with no detectable intrahepatic ***:Six patients with pathologically proven bile duct HCC thrombi but no intrahepatic mass demonstrated on the preoperative imaging or palpated intrahepatic mass during operative exploration,were *** clinical and imaging data were retrospectively *** major findings or signs on comprehensive imaging were correlated with the surgical and pathologic ***:Jaundice was the major clinical symptom of the *** elevated serum total bilirubin,direct bilirubin and alanine aminotransferase levels were in concordance with obstructive jaundice and the underlying liver *** the 6 patients showing evidence of viral hepatitis,5 were positive for serum alpha fetoprotein and carbohydrate antigen 19-9,and 1 was positive for serum carcinoembryonic *** patient was correctly diagnosed by *** main features of patients on comprehensive imaging were filling defects with cup-shaped ends of the bile duct,with large filling defects presenting as casting moulds in the expanded bile duct,hypervascular intraluminal nodules,debris or blood clots in the bile *** obvious circular thickening of the bile duct walls was ***:Even with no detectable intrahepatic tumor,bile duct HCC thrombus should be considered in patients predisposed to HCC,and some imaging signs are indicative of its diagnosis.

关键词： Hepatocellular carcinoma Obstructive jaundice Bile duct tumor thrombus Diagnosis Diagnostic imaging

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无牙颌患病率下降带来的影响

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中国口腔医学继续教育杂志 2005年第2期8卷 49-53页

作者： PhilippeMojon MarkThomason Angusw．G．walls 吴敏节冯海兰不详北京大学口腔医学院，北京海淀区中关村南大街22号100081

目的研究欧洲三国人口学特征的变化和无牙颌患病率的下降给义齿修复需求带来的影响。材料与方法收集欧洲三国(芬兰，瑞典，英国)有关无牙颌患病率的详细信息，其中英国和瑞典同时还收集了文献已报道的两国未来10年内无牙颌预期患病率... 详细信息

目的研究欧洲三国人口学特征的变化和无牙颌患病率的下降给义齿修复需求带来的影响。材料与方法收集欧洲三国(芬兰，瑞典，英国)有关无牙颌患病率的详细信息，其中英国和瑞典同时还收集了文献已报道的两国未来10年内无牙颌预期患病率的信息。而芬兰则是结合文献报道的实际无牙颌的患病率来预测未来人群中无牙颌所占比例。本次研究也对单颌牙列缺失的情况进行了分析和评估。人口学特征变化趋势的资料来自官方的网站。结果欧洲三国的义齿修复市场将面临萎缩。瑞典的无牙颌患病率已呈现下降的趋势，该国在未来20年内还有可能出现最大幅度的下降(约60％)，但从绝对数字上看瑞典无牙颌患者下降的数量还远小于英国和芬兰两国。芬兰的这种变化趋势更为惊人，但仅凭本研究中获得的信息是难于对芬兰的变化趋势作出较为客观的预测的。虽然本研究在设计上还存在局限性，但即使是对无牙颌患病率作出的最消极的预测．发现人口学特征的变化是不会影响欧洲的义齿修复市场的。结论尽管欧洲的人口学特征发生了变化．但这不会影响义齿修复的需求。而义齿修复需求本身的大幅度下滑必然会影响到未来的牙科服务市场及其教育体系。

关键词：无牙颌患病率义齿口腔检查

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海外中端拍行05综述

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收藏．拍卖 2006年第3期 38-39页

作者：安颐博罕斯纳高（供图） woolley＆walls（供图）

提及海外拍行，人们的目光总聚焦于佳士得和苏富比，对于其他拍行少有注意。三月，在06春拍筹备的当下，本刊特梳理过去一年海外其他拍行经营中国艺术品的概况，以期还原全球中国艺术品交易的全貌。在这些拍行里，动辄估价上千万的拍品... 详细信息

提及海外拍行，人们的目光总聚焦于佳士得和苏富比，对于其他拍行少有注意。三月，在06春拍筹备的当下，本刊特梳理过去一年海外其他拍行经营中国艺术品的概况，以期还原全球中国艺术品交易的全貌。在这些拍行里，动辄估价上千万的拍品鲜有出现，中端拍品成为主流。面对近年中国艺术品在艺术市场里的需求状况，这些拥有百年经验的老拍行所采取的策略绝对值得内地拍行关注，而对于内地买家而言，去海外淘到宝贝更不失为一种精明的选择。

关键词：外国中国艺术品需求状况艺术市场交易价格收藏

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