Results 101 to 110 of about 18,390 (212)

多重结构Ti-B 4 C/Al2024复合材料的组织和力学性能

, 2019
Hui Li, Xiao Wenlong, ZHANG Yi-tan, Ma Chaoli   +3 more
openalex   +2 more sources

以新型[Mo<sub>8</sub>Na<sub>2</sub>O<sub>28</sub>]<sup>6-</sup>多阴离子为建筑单元的 2D→3D 互锁配位聚合物的组装、结构及性质 [PDF]

, 2011
Hong‐Yan Lin, Jin Li, Ai‐Xiang Tian, XiuLi WANG, Guocheng Liu   +4 more
openalex   +1 more source

Excellent Comprehensive Electromechanical Properties in PZT‐Based Hard High‐Temperature Piezoceramics

Rare Metals, EarlyView.
ABSTRACT High‐power piezoelectric ceramics which have a wide operating temperature range are essential for sensor and actuator applications in extreme conditions. However, their development is fundamentally hindered by the inherent trade‐off among key parameters (TC, d33, Qm).
Rui Yan, Weisan Fang, He Qi, Hang Ma, Chenyu Zhao, Jie Wu, Weihang Liu, Huifen Yu, Yu Chen, Liang Chen, Jun Chen   +10 more
wiley   +1 more source

考虑结构整体性的约束组合梁抗火性能参数分析及实用计算方法

Jianzhu Gangjiegou Jinzhan, 2008
由于结构的高次超静定,处于结构整体中的约束构件与单个独立构件的抗火性能具有很大不同,这已在Cardinton试验以及一些火灾现象中得到了证实。影响约束组合梁抗火性能的参数很多,采用试验的方法研究这些参数的影响代价很高,本文利用经过试验检验的理论分析方法分析了荷载比、约束刚度、钢梁与混凝土相对面积比等对约束组合梁抗火性能的影响。并根据参数分析结果给出了考虑结构整体性影响的组合梁抗火实用计算方法,最后通过实例说明了实用抗火计算方法的应用。
王银志, 李国强
doaj  

Using miniaturized laboratory equipment and DNA barcoding to improve conservation genetics training and identify illegally traded species

Conservation Biology, EarlyView.
Abstract Illegal wildlife trade (IWT) is one of the largest global illegal activities, and it negatively affects biodiversity and sustainable development worldwide. DNA barcoding coupled with high‐throughput sequencing (i.e., metabarcoding) is useful in identifying taxa affected by IWT and has been used routinely for decades.
Maria Joana Ferreira da Silva, Ivo Colmonero‐Costeira, Saidil Lamine Djaló, Tomás Camará, Rui M. Sá, Tania Minhós, Angelika Kiebler, Martin Grethlein, Netta Pikkarainen, Stefan Prost   +9 more
wiley   +1 more source

线路柱式绝缘子组

Dianci bileiqi, 1989
美国Sediver公司制造了115及345kV用复合式棒形悬式及水平式线路柱式绝缘子组合.当水平式线路柱式绝缘子电气性能合适,而垂直负荷超过其最大设计弯曲负荷时,此结构可提供更高的垂直负荷值.这种结构还可用于老线路升压,而修改原线路结构成本很高或需控制导线舞动.绝缘子组的结构有三种:底脚固定式、垂直V形及水平V形串组 ...
doaj  

两种不同AFP启动子控制下表达HIV vpr基因的重组非复制型腺病毒获得及鉴定

Zhongguo shiyan zhenduanxue, 2004
目的　构建及包装由全长 5 1kbAFP启动子和低氧反应元件 （HRE）与 0 3kbAFP启动子两者组合的杂合0 3kbAFP启动子控制下表达HIVvpr基因的两种重组非复制型腺病毒。方法　采用细菌内同源重组腺病毒载体制备方法和PacI酶切、PCR、SouthernBlot鉴定方法。结果　构建及包装出由这两种AFP启动子控制下表达HIVvpr基因的重组非复制型腺病毒 ,经PacI酶切、PCR和SouthernBlot基因整合分析证明构建成功。结论　我们成功构建了的全长5 ...
魏强, 李凡, 王健伟, 郭丽, 洪涛   +4 more
doaj  

Co掺杂对RGO/Fe 3 O 4 复合材料组织结构和吸波性能的影响

, 2018
黄玉炜, 王玉江, 魏世丞, 梁义, Bo Wang, 黄威, 徐滨士   +6 more
openalex   +2 more sources

Assessing the integration of social marketing principles in ivory demand management interventions in China and Southeast Asia

Conservation Biology, EarlyView.
Abstract Consumer demand for ivory perpetuates the unsustainable and illegal killing of African elephants and other wildlife species. Interventions that aim to change consumer behavior are increasingly recognized as a crucial element of demand management. However, poor design and implementation have limited their effectiveness.
Molly R. C. Brown, Victoria K. Wells, Colin M. Beale   +2 more
wiley   +1 more source

巨型钢框架-双钢板组合剪力墙住宅体系力学性能探究

Jianzhu Gangjiegou Jinzhan
在巨型结构体系的基础上提出巨型钢框架-双钢板组合剪力墙住宅体系。基于实际超高层混凝土住宅工程背景建立高度为156 m的计算模型，对其进行弹性反应分析及弹塑性时程分析以评估结构力学性能。通过对比主次结构不同的连接假定，探究主次结构连接方式对于结构整体性能及关键结构构件的影响。基于ABAQUS软件分析了次结构与双钢板组合剪力墙之间采用不同连接方式对剪力墙各部件的影响。最后对该结构体系进行经济性分析。研究结果表明：该结构体系能满足建筑户型无柱大空间设计要求且具有优良的力学性能和经济性指标，在设计中主 ...
周志轩, 刘健
doaj