Results 31 to 40 of about 10,410 (133)
Jianzhu Gangjiegou Jinzhan, 2022 单向螺栓是一种仅在一侧操作便能完成安装的螺栓，因此在闭口截面构件中的连接具有优势。预拉力是保障高强度螺栓连接抗拉刚度的重要参数，但单向螺栓的预拉力和扭矩之间的关系尚不明确。分析了自锁式单向高强螺栓在安装过程与拉伸过程中的受力情况，给出了单向螺栓预拉力的计算方法。对于三种直径、两种强度的标准化自锁式单向螺栓和非标准化自锁式单向螺栓进行了拉伸试验，并基于拉伸试验的荷载-位移曲线，得到了不同型号自锁式单向螺栓在不同拉伸试验中的钢板分离荷载，并根据公式计算得到了单向螺栓在不同安装扭矩下的预拉力值 ...
蒋蕴涵, 李国强, 陈琛, 侯兆新
doaj
Wildlife Letters, Volume 3, Issue 1, Page 22-29, March 2025.Human–wildlife conflict poses a major threat to conservation and livelihoods. Here, we outline two innovative approaches: one where local people monitor wildlife on their land using camera‐traps and receive tangible, significant benefits as a direct result of that recorded wildlife presence, and one where that approach is expanded into wider ...
Amy Dickman +8 more
wiley +1 more source
Considering connections between Hollywood and biodiversity conservation
Conservation Biology, Volume 32, Issue 3, Page 597-606, June 2018., 2018 Abstract Cinema offers a substantial opportunity to share messages with a wide audience. However, there is little research or evidence about the potential benefits and risks of cinema for conservation. Given their global reach, cinematic representations could be important in raising awareness of conservation issues and species of concern, as well as ...
Matthew J. Silk +3 more
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Conservation Biology, Volume 39, Issue 1, February 2025.Abstract Trade restrictions are often advocated and implemented as measures to protect wild species threatened by overexploitation. However, in some instances, their efficacy has been questioned, notably by governments in the southern African (SADC) region, which tend to favor a sustainable use approach to wildlife management. We conducted a systematic
Christina Hiller +1 more
wiley +1 more source
Jianzhu Gangjiegou Jinzhan, 2017 以试验数据为依据,分别采用我国现行规范有效宽度法、规范拟修订稿有效宽度法和直接强度法计算了202个轴压构件、62个受弯构件、55个压弯构件的稳定承载力,通过试验值与计算结果的对比,综合研究了3种方法之间的差异性,对可靠度进行了定性分析。结果表明,拟修订的有效宽度法和直接强度法所得试验值与计算值之比的平均值更接近于1.0,且计算结果偏于安全,优于现行规范有效宽度法。从变异系数的结果可以看出修订有效宽度法和直接强度法的计算结果相差不大,并且它们的离散性都比现行规范有效宽度法小。
王春刚, 孔德礼, 张耀春
doaj
Engaging youth in biodiversity education through visual narrative
Conservation Biology, Volume 38, Issue 6, December 2024.Abstract Engaging youth in early and sustained conservation education has important implications for promoting positive attitudes and behaviors in those who will become the future of conservation and management. Toward this goal, visual narratives (comic books, graphic novels) are an increasingly popular method used by conservation scientists to ...
Kyra Ricci +3 more
wiley +1 more source
Jianzhu Gangjiegou Jinzhan, 2013 结构强度折减系数是基于强度抗震设计法中确定设计地震作用的关键。我国现行《建筑抗震设计规范》[1]（GB 50011—2010,简称《规范》）对不同的结构体系采用单一的强度折减系数,不尽合理。在已有强度折减系数方法基础上,提出了以中震位移限值为极限位移的改进间接确定强度折减系数方法,将其应用于钢框架结构强度折减系数中,并与直接强度折减系数方法进行对比分析,验证了此方法的有效性和准确性,研究表明钢框架结构强度折减系数不受建筑层数的影响,其强度折减系数接近于4。
张伟莉, 李钢
doaj
Community perceptions of invasive species and environmental management in a US island territory
Conservation Biology, Volume 38, Issue 6, December 2024.Abstract Environmental managers struggle with communicating accurate and relevant information and with gaining trust from the communities they serve, problems that are especially pronounced in minority and colonized communities. An important step in developing successful management strategies is partnering directly with the communities involved, but ...
Ann Marie Gawel +2 more
wiley +1 more source
Jianzhu Gangjiegou Jinzhan, 2019 以由单肢C形和U形截面拼合而成的冷弯薄壁型钢拼合截面轴压柱试验结果为基础,对采用我国现行规范与征求意见稿中有效宽度法计算的30根(6种截面,5种长度)轴压构件的极限承载力进行了对比分析。基于有效宽度法,提出了针对组合截面承载力的计算方法。比较了我国规范征求意见稿与美国规范中直接强度法的不同,基于美国规范的直接强度法利用CUFSM有限元软件对拼合截面进行建模分析,取消螺钉拼合连接部分的板件边界,将拼合截面作为一个整体进行分析,拼合部分厚度在1.0t至2.0t。对比发现:对于开口截面,厚度为1 ...
崔瑶, 陈宇彤, 宋世聪
doaj
The soft channels of policy diffusion: Insights from local climate change adaptation policy
Policy Studies Journal, Volume 52, Issue 4, Page 881-906, November 2024.Abstract Diffusion has become both an important concept for studying policy spread and a popular governance approach, particularly where direct coercion is unavailable or undesirable. However, the prevailing mechanism‐centered concept is difficult to measure and poorly captures the governance potential of policy diffusion. To address these issues, this
Kai Schulze
wiley +1 more source