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Jianzhu Gangjiegou Jinzhan, 2015 大量工程实践表明,组合梁的破坏主要源于抗剪栓钉的疲劳破坏。在疲劳荷载下,承受拉压循环应力的栓钉裂纹萌生、扩展至最终断裂,使钢梁与混凝土的组合作用失效,所以研究栓钉中裂纹萌生及扩展规律对实际工程具有重大意义。扩展有限元(eXtended Finite Element Method,XFEM)是近年来发展起来的一种求解涉及移动非连续问题的有效方法。基于ABAQUS平台利用此方法建立了组合梁推出试验的模型,进行了静力承载力以及疲劳寿命分析,模拟了栓钉中裂纹从萌生到断裂失效的过程 ...
韩庆华, 王一泓, 徐杰, 邢颖
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Veterinary Dermatology, Volume 34, Issue 6, Page 543-553, December 2023., 2023 Background – Hymenoptera envenomation with honey bee (Apis mellifera) and paper wasp (Polistes spp.) may cause life‐threatening anaphylaxis in dogs. In human patients, clinical history, intradermal testing (IDT) and measurement of allergen‐specific serological immunoglobulin (Ig)E (sIgE) are used to support a diagnosis of Hymenoptera venom ...
Hilary H. Chan +3 more
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Region‐wide retreats from lower elevations of range‐restricted birds across the Northern Andes
Conservation Biology, Volume 37, Issue 5, October 2023., 2023 Abstract Local studies show upslope shifts in the distribution of tropical birds in response to warming temperatures. Unanswered is whether these upward shifts occur regionally across many species. We considered a nearly 2000‐km length of the Northern Andes, where deforestation, temperature, and extreme weather events have increased during the past ...
Wilderson Medina +2 more
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Family Process, Volume 62, Issue 2, Page 534-556, June 2023., 2023 Abstract Study of change mechanisms is important to advance theory development and to reveal the active components that make a critical difference in treatment. Improved outcomes in a randomized controlled trial that favored Congruence Couple Therapy (CCT) vs individual‐based Treatment‐as‐Usual (TAU) were correlated within each group.
Bonnie K. Lee +2 more
wiley +1 more source
, 2016 本发明公开了一种土体原位直剪试验仪，包括：钢架；垂直油缸，设置在所述钢架上；圆筒，可水平移动地设置在所述垂直油缸的动力输出端；水平油缸，设置在所述钢架上；推碗，设置在所述水平油缸的动力输出端，用于对所述圆筒施加水平的推力，并使所述圆筒移动预定的距离；其中，在所述水平油缸上还设置有用于测量位移的位移传感器和用于测量推力的第一压力传感器，在所述垂直油缸上还设置有用于测量侧压的第二压力传感器。本发明使用垂直油缸和水平油缸自动逐步施加水平和竖直载荷，利用剪切实验得到土体粘聚力、内摩擦角标准值、压力-变形曲线 ...
赵颖 +6 more
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, 2012 本发明涉及一种微扭矩力学试验机及其测试方法。该试验机包括：控制装置和试验机主机，所述控制装置用于设置试验方法，向试验机主机发出命令和分析处理从试验机主机得到的实验数据；所述试验机主机用于对试样进行加载。测试方法包括：通过定制的试验软件控制信号发生模块产生一电压信号，经调理放大后驱动试验机主机工作；信号采集模块采集角度信号和线圈的驱动信号；将采集到的角度信号换算为旋转角，将采集到的线圈驱动信号换算为扭矩；按照力学模型进行数据处理，得出被测试样的切应力一切应变曲线，进而可进一步计算出剪切模量和剪切强度 ...
郇勇, 张泰华
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Gaoya dianqi, 2021 由断路器和合成试验标准规定的工频恢复电压(PFRV)推导出合成试验时PFRV的衰减时间常数,分析了PFRV的严酷度,给出了工频恢复电压电抗器的正确定值方法,以及它的衰减时间常数的解析计算式。
庄稼人, 张玲, 郑占锋
doaj
, 2023 高超声速边界层是一个基础的科学问题。为了研究高超声速平板边界层的流场特性，结合数值模拟、理论求解和试验验证三种手段进行综合分析。数值模拟对二维Navier-Stokes (N-S)方程采用五阶精度的WENO格式离散对流项、六阶中心格式离散黏性项，时间推进项采用三阶Runge-Kutta法。理论分析利用四阶Runge-Kutta结合打靶法求解得到可压缩平板边界层层流自相似解。试验验证利用中科院力学所JF-12复现风洞测试得到大尺度平板的壁面热流，大尺度的平板模型布置传感器达到了较高的空间分辨率 ...
姜宗林, 刘美宽, 韩桂来
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Gongye shui chuli, 1992 本文介绍了采用正交设计法,通过旋转挂片试验、动态模拟试验及工业应用试验的全过程,成功地推出了热态清洗预膜的最佳配方,讨论了六偏磷酸钠水解、药剂的作用及工业应用试验中应注意解决的问题。
王东昶, 万淑清
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Behavioral interventions to reduce demand for threatened freshwater turtles as pets
Conservation Biology, EarlyView.Abstract Growing demand for freshwater turtles as pets has fueled illegal trade and accelerated wild population declines, underscoring the need for theory‐based demand‐reduction interventions. We conducted a three‐part randomized controlled trial with active turtle keepers (n = 1800) in China to test conservation‐ and legality‐framed messages by ...
Wuji Zheng +9 more
wiley +1 more source