Results 31 to 40 of about 20,428 (239)

On construction of Chinese compounds [PDF]

open access: yes, 2016
2012-2013 > Academic research: refereed > Publication in refereed journalVersion of ...
Hong, S, Shi, D
core  

Constructed value of information with iterative scoring and parametric uncertainty to identify management‐relevant research priorities for a declining raptor species

open access: yesConservation Biology, EarlyView.
Abstract Constructed value of information (CVoI) is an expert elicitation decision‐analytic tool used to prioritize sources of uncertainty based on their potential to improve decision outcomes if resolved. Despite increased application of CVoI, the robustness of CVoI prioritization of sources of uncertainty relative to differences in expert elicitation
Kristin P. Davis   +7 more
wiley   +1 more source

组合结构化合物Ho2Ni7-xFex (x-0-3.0)的晶体结构、结构转变和磁性

open access: yes, 2013
在金属间化合物的结构演变中,原子尺寸因素起着重要的作用.由于密堆积效应,不同原子半径比的元素往往形成不同的结构.而自由电子填充于原子构成的晶体结构的间隙中,它对化合物的结构也有影响.基于组合结构化合物Ho2Ni7-xFex ,结合原子尺寸与自由电子对晶体结构的不同影响,文章探讨一种单位体积内自由电子浓度的经验方法来判断Ho2Ni7-xFex 化合物中两种异构体问的转变.随着Fe含量的增加,Ho2Ni7-xFex 化合物先结晶成Gd2C07型三方结构,然后结晶成Ce2Ni7型六方结构 ...
杨育奇, 高庆庆, 李冠男
semanticscholar   +1 more source

Experimental Study of Steel-reinforced Concrete Columns under Sustained Axial Loads [PDF]

open access: yes, 2014
型钢混凝土柱是由混凝土、型钢和钢筋组合而成的结构构件,具有良好的承载性能。型钢混凝土柱结合了钢筋混凝凝土的刚度和型钢的强度,是一种非常经济适用的结构形式。作为混凝土包钢结构不仅增加了自身刚度,同时能够保护型钢免于遭受火灾和局部屈曲破坏。型钢混凝土结构具有抗震性能好、承载力高、耐火性和耐久性好等诸多优点,现广泛用于高层、超高层、大跨度结构等重要建筑中。随着型钢混凝土柱的广泛应用,国内外开展了大量的理论和试验研究。目前,国内外对于型钢混凝土柱的研究主要集中在极限承载能力、型钢与混凝土的共同工作性能 ...
王洋
core  

Survey on the deployment and design for regular topology structures in wireless sensor networks [PDF]

open access: yes, 2012
In wireless sensor networks,such regular topology structures as Square,Hexagon and Triangle could fully cover the area to be monitored,provide accurate positioning for special events,and achieve better network performance.In order to provide valuable ...
Jian-feng YANG   +3 more
core   +1 more source

Effects of landscape context on avian specialist response to increased surface temperature in protected areas

open access: yesConservation Biology, EarlyView.
Abstract Human development is a driver of global change and a major threat to biodiversity. Protected areas maintain and support biodiversity, but outside stressors, such as climate change and land use change, can negatively influence natural resources within protected areas.
Leah J. Rudge   +2 more
wiley   +1 more source

钢梁-钢筋混凝土柱组合结构研究的进展

open access: yesJianzhu Gangjiegou Jinzhan, 2006
近年来,在组合结构中出现一种新型的结构形式,即由钢筋混凝土柱和钢梁(RCS)组成的框架结构。本文较为系统地阐述国际上RCS组合结构抗震性能的研究情况。主要包括RCS梁柱节点的试验研究、RCS组合框架的试验研究和有限元分析、RCS组合结构的抗震设计及性能分析,以及美日“设计指南”的完善与发展。最后指出RCS结构研究存在的问题和今后的研究趋势。
申红侠
doaj  

Applicability and Structure Optimization of Cyclone Separator Based on Numerical Simulation [PDF]

open access: yes, 2015
旋风分离器是一种利用气-固两相流体的涡旋运动使固体颗粒在离心力的作用下从气流中分离出来的设备,它具有结构简单、操作维护简便、制造安装价格低等优点,被广泛应用于石油、化工、冶金等领域。由于其内部流场具有强旋流湍流特征,气流和颗粒的运动十分复杂,传统的实验方法很难深入研究其内部流场规律和分离机理,随着计算流体动力学的发展,数值仿真分析成为研究旋风分离器的主要手段。 旋风分离器的工况和结构参数会对其性能产生决定性影响。对于一个给定的旋风分离器,其工况参数包括颗粒半径、颗粒密度和入口速度 ...
吕智
core  

Scenarios and strategies for future‐proofing ecosystem management under climatic novelty

open access: yesConservation Biology, EarlyView.
Abstract Climate change is driving unprecedented declines in dominant, habitat‐forming foundation species across marine and terrestrial ecosystems globally. As climatic novelty becomes the norm, ecosystem reassembly will become increasingly common. Predicting and understanding these transitions, and their implications for future ecosystem functioning ...
Lauren T. Toth   +14 more
wiley   +1 more source

框架-剪力墙组合结构的拟动力试验研究

open access: yesJianzhu Gangjiegou Jinzhan, 2016
楼板平面内刚度对整体结构抗震性能有着重要影响,为研究带现浇混凝土楼板的框架-剪力墙组合结构体系的抗震性能,对一个3层2跨缩尺比例为1/4的框架-剪力墙组合结构进行了等效单自由度拟动力试验研究,观察该结构在地震作用下的动力反应,着重分析该框架-剪力墙组合结构在拟动力荷载情况下的破坏机制、耗能性能及变形恢复能力,从而掌握该框架-剪力墙组合结构的动力性能,为完善组合结构设计理论提供可靠的试验依据。结果表明,带现浇混凝土楼板的刚性可以保证结构的空间整体性和水平力的有效传递,该组合结构体系具有良好的抗震性能 ...
韩春, 李青宁, 姜维山
doaj  

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