Results 61 to 70 of about 1,226,577 (254)
, 2016 将多种新能源联合开发利用,使之能够取长补短,是未来新能源发展的重要方向之一。世界第一座太阳能–地热能联合电厂已经建成发电,与其相关的研究工作也已蓬勃开展。从已有的研究结果看,太阳能和地热能主要有两种结合方式——以地热能为主的联合发电系统和以太阳能为主的联合发电系统;研究内容主要围绕提高太阳能、地热能的利用效率,增加系统发电量而展开,根据系统处于稳态和非稳态时不同的运行特征,评估系统的热力性能和经济性能,指出保证系统长期稳定运行应考虑的问题。研究表明 ...
陆振能 +5 more
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Informal supply chains of wild meat from rural Amazonia and food security in an urban center
Conservation Biology, EarlyView.Abstract Iquitos, the most populated city in the Peruvian Amazon, is a hub in the regional supply chain of wild meat and supplies urban consumers. Studies on wild meat consumption have focused primarily on markets, limiting the scope of species considered to those that are economically valuable and potential inferences from those data.
Fiorella Briceño Huerta +3 more
wiley +1 more source
Jianzhu Gangjiegou Jinzhan, 2010 设计钢管混凝土梁柱长圆孔变型性高强螺栓节点,上下节点板通过高强螺栓拼接连接钢管混凝土柱与钢筋混凝土梁,并引入长圆形螺栓孔以提高节点的延性变形性能。本文通过两个长圆孔变型性高强螺栓节点试件及两个传统焊接节点试件的低周反复加载试验,对不同连接方式节点在地震作用下的承载力、延性变形能力、耗能能力、滞回性能进行研究与对比。试验结果表明,螺栓节点满足节点承载能力,同时其延性性能好于传统焊接节点,节点的延性变形能力通过螺栓在长圆孔中的滑移有明显提高。与焊接节点相比较,最终两个长圆孔变型性螺栓节点发生延性破坏 ...
马人乐 +4 more
doaj
, 2010 一种同时提高热压磁环磁性能及力学性能的方法，包括将钕铁硼速凝片作为母合金快淬成的薄带，然后将薄带破碎磁选成均匀的快淬粉末，接着进行热压成型，热挤压成型，其特征在于在热压成型前将快淬粉末中均匀添加有纳米金属Cu粉末。与现有技术相比，本发明的优点在于：加入具有低熔点、延展性良好的纳米金属Cu粉末的目的是可以使具有该特点的纳米金属粉末在热压过程中，通过扩散的方式，更加均匀的分布在钕铁硼晶粒的晶界中，改善了磁体的织构，该晶界相化合物的维氏硬度远大于纯钕铁硼磁体晶界富钕相的维氏硬度 ...
易鹏鹏, 李东, 林旻, 闫阿儒
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Conservation Biology, EarlyView.Abstract Procedural, distributional, recognitional, and epistemic justice aspects of conservation interventions are well documented in contexts where pastoralism is a key livelihood and way of life. Geospatial analyses and representations of wildlife conservation and restoration that are increasingly applied in pastoralist rangeland socioecological ...
Ryan R. Unks
wiley +1 more source
Zhongguo shiyan zhenduanxue, 2013 目的研究慢性肾源性肾功能不全患者动脉弹性功能。方法测量慢性肾源性肾功能不全患者左颈总动脉内径,测量右肱动脉血压,计算动脉血管僵硬度、扩张度、顺应性,从而判断动脉弹性功能。结果慢性肾功能不全合并高血压组及未合并高血压组的动脉僵硬度均高于正常组,扩张度及顺应性均低于正常组,两组间存在显著差异。结论本研究表明慢性肾源性肾功能不全患者血管僵硬度增高,扩张度及顺应性降低,与正常组存在显著差异,超声检查无创伤,简便,廉价,非常适合基层医院。
郭巍, 胡秀丽, 潘润铎, 白凤芝
doaj
, 2011 本发明涉及适用于酸性电解液液流储能电池的一种有机无机复合离子交换膜及其制备方法。本发明还涉及包含本发明聚合物离子交换膜的酸性电解液液流储能电池。该类复合离子交换膜制备方法简单，容易实现大批量生产。制备的复合离子交换膜具有优良力学强度，其酸性电解液液流储能电池中具有优良的质子传导性和优异的阻隔正负极离子渗透性 ...
史丁秦, 张华民, 李先锋
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Assessing differences among elasmobranch nurseries to aid conservation based on a genomics framework
Conservation Biology, EarlyView.Abstract Elasmobranch nurseries often differ in environmental conditions, demographics, and use patterns. These differences affect the distribution of genetic variation among nurseries. However, conservation and management strategies often fail to account for such differences because they are difficult to characterize.
Dominic G. Swift +8 more
wiley +1 more source
, 2018 利用激光冲击强化(LSP)处理了6061铝合金,研究了LSP对试样耐磨性能及电化学性能的影响,并对试样的显微硬度和残余应力等进行了测试与分析。结果表明,LSP能有效提高试样的力学性能;LSP试样的表面没有发生物相变化,但硬度与残余应力显著增大,耐腐性明显提高;LSP前后试样的摩擦系数相近,但LSP试样的磨损量减小 ...
黄亿辉 +3 more
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Emerging applications of large language models in ecology and conservation science
Conservation Biology, EarlyView.Abstract Large language models (LLMs) mark a major development in artificial intelligence, with potentially transformative implications for ecology and conservation science. Built on advanced deep‐learning architectures, these models can support a wide range of tasks. We reviewed emerging applications of LLMs, drawing on the wider scientific literature
Christos Mammides +5 more
wiley +1 more source