Results 51 to 60 of about 621,014 (218)
, 2009 本发明涉及相变材料的制备方法，具体的说是一种具有较高相变潜热，并且在固体和液体状态下均具有很高导热系数的复合相变材料的制备方法。按如下步骤制备：1)制备金属纳米线；2)将金属纳米线分散到有机溶剂中； 3)将有机相变材料与上述混合物混合；4)加热条件下超声波分散混合物并除去有机溶剂。通过这种方法制得的相变材料，工艺简单，成本低，在保持较高的相变潜热的同时，大大提高了有机相变材料的导热系数，从而有效地改善了有机相变材料的性能，大幅度地拓展了它的应用范围 ...
孙立贤, 赵军宁, 徐 芬, 曾巨澜
core
Genomics‐informed management of ex situ populations
Conservation Biology, EarlyView.Abstract The European Association of Zoos and Aquariums (EAZA) manages insurance populations for hundreds of species through its EAZA ex situ programs (EEPs). EEPs help safeguard against extinction in the wild and provide source populations for genetic rescue programs.
Cock van Oosterhout +8 more
wiley +1 more source
Optimizing biodiversity offsetting for habitat succession and colonization dynamics
Conservation Biology, EarlyView.Abstract Biodiversity offsetting aims to compensate for ecological losses from development through conservation and restoration. However, its long‐term outcomes under repeated impact–offset cycles remain uncertain. Using a conceptual forest succession model, we evaluated how offset outcomes are affected by interactions among compensation scale ...
Konstans Wells +4 more
wiley +1 more source
Gaoya dianqi, 2017 接地模拟试验是实现接地网参数预测与接地特性分析的基本方法。一些接地材料如柔性石墨复合接地材料、离子接地体以及接地模块等在进行接地模拟试验时,其部分相似项并不能按照相似条件进行缩比,使得接地网原型的预测误差较大。针对此问题,笔者首先阐述了接地模拟试验的畸变相似模型,分析接地模拟试验中畸变相似项的来源,然后提出畸变系数与畸变项敏感度的概念。最后通过仿真实例和实际接地模拟试验,分析不同土壤电阻率与模型相似比条件下,接地模拟试验对接地体直径畸变项与接地体电阻率畸变项的敏感度 ...
高晓东 +5 more
doaj
Pest‐preservation paradox among insects
Conservation Biology, EarlyView.The pest‐preservation paradox is a non‐binary perspective that insects range from those that are harmful and requiring management on the one side, to those requiring conservation intervention on the opposite end of the spectrum. Importantly, the vast majority of insects occur somewhere in the center of the two extremes, and their position along the ...
Michael J. Samways +3 more
wiley +1 more source
Methodology to identify ecologically matching areas and its applications in conservation planning
Conservation Biology, EarlyView.Abstract Identifying ecologically matching areas is both challenging and critical for understanding spatial patterns of biodiversity and advancing conservation planning. However, existing approaches often lack spatial flexibility, overlook shape and size constraints, or rely on limited environmental parameters, reducing their effectiveness in real ...
Pietro Milanesi +7 more
wiley +1 more source
, 2008 多元醇类相变材料是相变材料中质量储热密度大、过冷度低、具有固－固相变的一类相变材料。本论文采用精密绝热量热法、燃烧量热法和近代热分析技术对多元醇类相变材料的热容、相变、燃烧热、标准摩尔生成焓和热稳定性等基础热力学性质进行了系统的研究，并对多元醇－中空纤维复合相变材料做了探索性研究，取得了如下结果： 首先，利用精密自动绝热量热仪测量了多元醇类固－固、固－液相变材料，天然多元醇类固－液相变材料等11种相变材料的热容。利用相变温区的热容数据，计算出化合物的相变温度、相变焓和相变熵 ...
童 波
core
How endorser attributes influence conservation communication
Conservation Biology, EarlyView.Abstract Conservation communication often uses the celebrity endorsement strategy. However, robust evidence regarding its effectiveness is still limited. More importantly, practitioners do not have guidelines for selecting an ideal endorser because there is no clear consensus on what endorser attributes are most critical.
Xia He, Tien Ming Lee
wiley +1 more source
500 kV罗平站主变加装中性点限流电抗器电磁暂态研究及设备选型
Gaoya dianqi, 2017 随着电网的发展,部分自耦变压器中压侧电抗常接近于零,导致变压器220 kV侧发生近区单相或两相接地时,故障穿越电流已接近甚至超过变压器可承受短路电流的极限值,为限制罗平站220 kV单相或两相短路电流水平、改善主变运行环境,拟在主变中性点加装限流电抗器。采用最新EMTPE程序,通过对主变接入限流电抗后短路电流水平、过电压及绝缘配合等电磁暂态特性研究,提出了500 kV罗平站主变中性点限流电抗器阻抗选取原则及限流效果、工频及操作过电压水平、流经主变中性点电抗器的工频稳态及暂态电流水平 ...
王典浪, 李东, 杨晓维, 皮天满
doaj