Results 21 to 30 of about 9,512 (123)
在北方寒冷地区，钢管混凝土结构因冻融作用侵蚀而造成钢管开裂以及钢管混凝土结构力学性能劣化从而导致结构破坏的事故时有发生。针对冻融侵蚀后钢管混凝土界面黏结性能问题，制作了钢管混凝土推出试件，考虑冻融循环次数、混凝土强度、钢管径厚比等不同参数，进行冻融试验和推出试验，分析了界面黏结力的分布规律和影响因素，研究了冻融循环作用后钢管混凝土界面黏结滑移本构关系，确定了界面平均黏结强度以及峰值黏结强度、残余黏结强度特征值。结果表明，随着冻融循环次数的增加，界面平均黏结强度减小，极限荷载对应的滑移逐渐增大 ...
任根立 +3 more
core +2 more sources
Ultrasound in Obstetrics &Gynecology, Volume 64, Issue 6, Page 808-817, December 2024.ABSTRACT Objectives The primary aim was to validate the International Ovarian Tumor Analysis (IOTA) benign simple descriptors (BDs) followed by the Assessment of Different NEoplasias in the adneXa (ADNEX) model, if BDs cannot be applied, in a two‐step strategy to classify adnexal masses identified during pregnancy. The secondary aim was to describe the
J. Barcroft +8 more
wiley +1 more source
Shiyou jixie, 2014 综合考虑了高造斜井眼控制工具外壳和主轴的相互作用，推导出钻头偏转角和主轴变形轨迹与外壳刚度、主轴刚度及工具的结构参数相关的计算公式，建立了主轴在静态条件下的力学模型。通过模型计算得出钻头偏转角θ2=0.653 5°。利用高造斜井眼控制工具的试验台架进行试验验证，试验测得钻头偏转角θ2=0.638 9°。试验测得的数据与理论推导的数据非常接近，由此验证了所建力学模型的合理性。
冯定 +6 more
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Methods in Ecology and Evolution, Volume 15, Issue 11, Page 1926-1939, November 2024.Abstract Simulation studies are essential tools to assess statistical methods. Functioning as controlled experiments, simulations generate data from known underlying processes. However, unclear or incomplete reporting of simulation studies can impact their interpretability and reproducibility, potentially leading to the misuse of statistical methods ...
Coralie Williams +6 more
wiley +1 more source
Audience segmentation approach to conservation messaging for transforming the exotic pet trade
Conservation Biology, Volume 38, Issue 4, August 2024.Abstract Advancing transformative change for sustainability requires population‐wide behavior change. Yet, many behavioral interventions tackling environmental problems only examine average effects on the aggregate, overlooking the heterogeneous effects in a population.
Rumi Naito +3 more
wiley +1 more source
Progress developing the concept of other effective area‐based conservation measures
Conservation Biology, Volume 38, Issue 1, February 2024.Abstract In 2010, the introduction of other effective area‐based conservation measures (OECMs) into international policy caused a paradigm shift in area‐based conservation, which included consideration of areas outside formal protected areas and places where biodiversity conservation may not be a management objective for the site.
Carly N. Cook
wiley +1 more source
Gaoya dianqi, 2009 结合国内首套移动式静止型动态无功补偿（SVC）装置在江西电网实施的工程经验,根据现场的实际情况,分别就设备及子系统试验和系统调试验收试验两方面,详述了现场调试方法,给出了试验结果,提出了试验中的一些关键点和注意事项。文中获取的一些经验和结论可为SVC装置在我国电网中的进一步推广应用提供有益的指导和借鉴作用。
范瑞祥, 孙旻, 赵刚
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Dianci bileiqi, 1988 详细分析了目前国内外采用的加速老化试验方法中存在的问题。指出试验电压与参考电压成正比的观点是错误的。文中统计了国内外氧化锌阀片的参考电压和阀片的电容,表明阀片的参考电压和电容都存在一定的分散性。加速老化试验电压应考虑电容分散性引起的试验电压升高,试品应选择不同参考电压的阀片。并提出了加速老化试验的试品选择和试验电压的推荐方法。
张雨时
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Dianci bileiqi, 1982 本文介绍国外悬式绝缘子进行热机性能试验的意义,IEC推荐的试验方法基本内容及其由来,以及IEC试验方法比瑞典原有方法简化的内容及其使用状况,最后提出了尚需解决的问题。
曾明求
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