Results 41 to 50 of about 10,410 (133)
Jianzhu Gangjiegou Jinzhan, 2014 高强度螺栓连接分为摩擦型和承压型两类,是依照受剪螺栓连接的两种不同极限状态划分的。《钢结构设计规范》(GB 50017—2003)(简称03规范)不恰当地把受拉螺栓连接也纳入这两种分类,造成混乱。对此进行讨论,并提出改变分类的建议。受拉螺栓连接中螺栓通常要承受撬力。03规范不直接计算撬力,而是采用降低螺栓抗拉承载力设计值的方法,计算不够精确。《钢结构高强度螺栓连接技术规程》(JGJ 82-2011)虽然给出撬力计算方法,但存在值得商榷之处。在分析的基础上推出撬力的简化计算公式,并提出梁 ...
陈绍蕃
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Veterinary Dermatology, Volume 35, Issue 5, Page 479-491, October 2024.Background – Lop‐eared rabbits may be predisposed to otitis externa (OE) as a consequence of their ear conformation. Although otoscopy, otic cytological evaluation, and culture are valuable tools in dogs and cats, published data on rabbits remain lacking. Hypothesis/Objectives – This study aimed to assess the utility of otoscopy and cytological results
Nikoleta Makri +8 more
wiley +1 more source
Latin American Policy, Volume 15, Issue 3, Page 372-399, September 2024.Abstract This study employs the V‐Dem database and proposes an alternative calculation of the regular Electoral Democracy Index by incorporating the Direct Popular Vote Index, a component of the Participatory Democracy Index. The result is the creation of the Plebiscitary Electoral Democracy Index.
Ana Marcela Paredes
wiley +1 more source
Guangtongxin yanjiu, 2016 为了控制自由空间光通信系统的成本、体积和功耗,便于系统的维护与运行,针对现有的自由空间光通信系统一般采用强度调制/直接解调的方式,提出了一种新型的基于K平均算法的接收机结构,并从执行复杂度、鲁棒性和差错性能等方面与经典算法进行比较分析。结果显示,当数据块长度达到1 000时,所提算法性能可以逼近理想接收机性能。
王强, 李笑歌
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Ultrasound in Obstetrics &Gynecology, Volume 63, Issue 4, Page 446-456, April 2024.ABSTRACT Objective To determine the diagnostic accuracy of prenatal ultrasound in detecting coarctation of the aorta (CoA). Methods An individual participant data meta‐analysis was performed to report on the strength of association and diagnostic accuracy of different ultrasound signs in detecting CoA prenatally.
C. Villalaín +20 more
wiley +1 more source
Conformations of ring polymer chain in nanocomposites(纳米复合体系中环形高分子链的构型)
Zhejiang Daxue xuebao. Lixue ban, 2018 采用分子动力学模拟方法对纳米复合体系中环形高分子链的构型及纳米粒子的集聚行为进行了研究.在不同纳米粒子/高分子链吸附能作用下，复合体系中纳米粒子表现出3种集聚行为：直接接触集聚、均匀分散以及高分子与纳米粒子间的桥接集聚.同时考虑了环形高分子链的刚性强度，得到了环形高分子链的3个构型：中间吸附、马鞍型吸附和轨道绕行型吸附.研究发现，增强环形高分子链的刚性将有助于促进纳米复合体系中纳米粒子间的分散.
SONGQingliang(宋青亮) +1 more
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Wildlife Letters, Volume 2, Issue 1, Page 17-22, March 2024.Temminck's pangolin faces conservation threats, mainly habitat fragmentation, poaching, and trafficking. The study assessed the ecology, status, and distribution of Temminck's pangolin in Hwange National Park and directly sighted seven specimens. Biotic and abiotic factors influence pangolin distribution inside and outside protected areas.
Kelly Sabashau +4 more
wiley +1 more source
Jianzhu Gangjiegou Jinzhan, 2009 受弯的冷弯薄壁卷边槽钢基本上有板件局部屈曲,截面畸变屈曲和构件弯扭屈曲三种屈曲模式,随后有它们之间的相关屈曲。由于畸变屈曲模式对缺陷的敏感度高,因此其屈曲后强度提高的幅度远低于局部屈曲模式。但是与局部屈曲模式相比,畸变屈曲模式抵抗破坏的能力却很强。可以用有限单元法计算受弯卷边槽钢截面的畸变屈曲强度。本文介绍了澳大利亚-新西兰标准AS/NZS4600-2005,用手算法计算受弯卷边槽钢截面的弹性畸变屈曲应力,並用直接强度法计算其相关的屈曲承载力。
陈骥
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Zhongshan Daxue xuebao. Yixue kexue ban, 2008 [目的]探讨前列腺特异膜抗原单克隆抗体7E11C5.3介导铼-188和平阳霉素（PYM）导向治疗前列腺癌细胞系LNCaP的体外作用。[方法]以葡聚糖为中介体制备7E11C5.3-PYM偶联物，间接ELISA法测定免疫活性，2,3,5-氯化三苯基四氮唑（TTC）法测定抑菌活性。采用2-巯基乙醇直接还原法制备188Re-7E11C5.3标记物，纸层析法测定标记率和放化纯度，直线回归外推法测定免疫活性分数。四唑盐（MTT）法测定体外细胞毒作用。[结果]7E11C5.3-PYM偶联物中7E11C5 ...
张勇 +5 more
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考虑配电网与电化学储能交互耦合关系的异常运行状态预警方法 [PDF]
全球能源互联网配电网稳定性直接关系到终端用户侧储能的运行质量。针对配电网异常运行场景下用户侧储能系统的安全问题，提出了一种热失控预警方法。该方法通过确立从配电网异常状态到用户侧储能的完整传导路径，识别了锂离子电池热失控的关键特征量，包括异常电流值/电压值和异常状态持续时长。进而建立了用户侧储能的状态演化模型，分析了这些特征量对储能安全运行状态的影响。仿真结果揭示了不同异常电气量变化对储能安全的具体影响，如异常电流值/电压值与储能异常温度的高正相关性，以及异常状态持续时长的强正相关性。基于此 ...
范培潇 +6 more
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