Results 91 to 100 of about 1,226,577 (254)
, 2000 吸收器是吸收式制冷机中的一个重要部件。其性能好坏对整机性能有重要影响。本文介绍了水平管外降膜吸收性能的实验研究结果。实验表明，传质系数随着喷淋密度的增加而增加，而传热系数只在小喷淋密度范围内随喷淋密的增加而增加，在实验喷淋密度０．００５－０．０５５ｋｇ／ｍ．ｓ范围内有一最佳喷淋密度 ...
马伟斌, 梅建滨
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Institutional lessons from the Nordic management model
Conservation Biology, EarlyView.Abstract To improve wildlife management outcomes, in terms of reaching management goals and increasing legitimacy, Nordic countries have developed institutional systems involving stakeholders that aim for a more inclusive and participatory model.
Jens Nilsson +2 more
wiley +1 more source
Gaoya dianqi, 2016 针对并网风力发电机组性能分析评估中存在大量定性指标、各指标模糊性和随机性并存的问题,提出了基于云重心评判法的并网风电机组性能分析评估模型。首先从技术参数、整体功能、系统可靠性及机组维修性4个层面分析并构建了风电机组性能分析综合评价指标体系。然后将各指标值转化为云模型并确定各个指标的权重值。最后计算出修正的加权偏离度,将其输入定性评判云发生器得到风电机组性能评估结果。运用所提方法对某型风力发电机组性能进行分析,并与模糊综合评判法进行比较,验证了该模型的优越性和有效性。
张心刚, 苏浩益
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Jianzhu Gangjiegou Jinzhan, 2022 为研究装配式偏心支撑钢框架在地震作用下的抗震性能与破坏机理，对两种1层单跨的剪切屈服型装配式偏心支撑钢框架进行了拟静力试验，分别从两种框架的斜撑构造以及可替换能力两方面研究装配式偏心支撑的抗震性能，观察钢框架在低周往复荷载作用下的破坏特征，结合试验结果深入分析此类结构的抗震性能指标。试验结果表明：斜撑构造对装配式偏心支撑钢框架的抗震性能有较大影响，斜撑与框架横梁间采用螺栓连接的钢框架REBF在承载能力、耗能能力、耗能梁段的转动能力等方面均优于上半部分斜撑与框架横梁间采用焊接连接的钢框架KEBF ...
叶重阳, 王新武, 时强, 孙海粟
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Twelve principles for successful governance of community‐based coastal marine restoration
Conservation Biology, EarlyView.Abstract Global agreements, such as the Global Biodiversity Framework, call for urgent, large‐scale action to halt biodiversity loss through a whole‐of‐society approach. Community‐based restoration can play a crucial role in achieving this goal, yet there remains limited understanding of what makes these projects effective and sustainable.
Michelle M. Holian +2 more
wiley +1 more source
, 2017 苯并恶嗪树脂因其优异的综合性能被广泛用于涂料、电子、航空等领域,是一类非常重要的高性能热固性材料。然而其同样也存在一些缺点,如:原料来源多为石化资源,固化产物质脆及韧性差等。本文以生物基来源的丁香酚与糠胺为主要原料设计合成了一系列含硅柔性苯并恶嗪树脂,并对树脂及其固化产物的各种性能进行了详细研究。研究结果表明,树脂在室温下具有较低的粘度,范围从28.9到727Pa.s;固化产物表现出优异的热力学性能:断裂伸长率最高可达8.1%,初始分解温度与储能模量分别高达408°C和2100Mpa ...
代金月 +5 more
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Assessing and strengthening community‐based coastal governance
Conservation Biology, EarlyView.Abstract Community‐based coastal governance is essential for biodiversity conservation and sustainable livelihoods, yet many communities continue to face significant challenges in establishing and sustaining effective governance systems. We sought to improve understanding of the current status of community‐based coastal governance across five countries
Mark Andrachuk +21 more
wiley +1 more source
Behavioral interventions to reduce demand for threatened freshwater turtles as pets
Conservation Biology, EarlyView.Abstract Growing demand for freshwater turtles as pets has fueled illegal trade and accelerated wild population declines, underscoring the need for theory‐based demand‐reduction interventions. We conducted a three‐part randomized controlled trial with active turtle keepers (n = 1800) in China to test conservation‐ and legality‐framed messages by ...
Wuji Zheng +9 more
wiley +1 more source
Jianzhu Gangjiegou Jinzhan, 2016 超高层建筑结构常采用框架核心筒结构体系,利用外框架和核心筒之间的竖向变形差,在外框架和核心筒之间设置消能器,可形成消能伸臂体系。粘滞阻尼器、防屈曲支撑以及剪切耗能件均为性能稳定的消能器。为研究三种不同消能器构成的消能伸臂对高层建筑结构抗震性能的影响,结合实际工程案例对比分析了这三种体系的减震效果以及经济性。研究表明,三种消能器均能有效降低结构地震作用,其中粘滞阻尼器消能伸臂减震效果最佳,剪切阻尼器消能伸臂经济性最优,防屈曲支撑在减震效果和经济性方面具有较好的综合性能。
王志娴 +3 more
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