Results 51 to 60 of about 1,549,788 (235)
Gongye shui chuli, 2017 分析了膜元件性能测试过程中产生测试条件误差的原因，提出了膜元件性能指标标准化的概念，明确了进行标准化计算的必要性。描述了系统性能指标标准化的数学模型，并给出运用系统性能指标标准化模型进行元件性能指标标准化的计算方法与计算实例，指出标准化方法不仅可提高性能指标的精度，还可提高测试过程的效率。
陈玉坤, 苑宏英, 靖大为
doaj
Subspecies taxonomy reflects social and geographic patterns of taxonomic effort in tetrapods
Conservation Biology, EarlyView.Abstract Subspecies have been used in conservation biology to account for intraspecific patterns in genetic diversity, which is crucial to long‐term population viability. Although over 3200 subspecies are currently assessed by the International Union for Conservation of Nature Red List, their biological relevance remains controversial.
Jhonny J. M. Guedes +3 more
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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
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, 2000 本文对太阳能高效平板集热器与热水型一级溴化锂吸收式制冷机及热水型两级溴化锂吸收式制冷机组成的空调系统进行了计算分析。结果表明，在热水温度为８２－９５℃的范围内，太阳能一级溴化锂吸收式制冷系统具有较高的效率，但系统效率随热源温度的下降而急剧降低；在热源温度为６５－８２℃的范围内，太阳能两级溴化锂吸收式制冷系统具有较突出的优越性，系统效率几乎不随热源温的变化而变化。因此 ...
马伟斌, 梅建滨
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Using the capabilities approach to achieve people‐centered conservation
Conservation Biology, EarlyView.Abstract Top‐down interventions carried out by state and nonstate institutions to conserve biodiversity and improve the lives of forest‐proximate people (FPP) in the Global South tend to reflect economistic understandings of human well‐being. More progressive and people‐centered conservation projects are guided by normative visions of how the world ...
Arthur Rodrigues +4 more
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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
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Gongye shui chuli, 2000 以天然高分子植物粉F691为原料，通过羧甲基化、接枝共聚和曼尼期(Mannich)三步反应合成出两性天然高分子改性絮凝剂(CGAAC)。CGAAC对污泥脱水性能的研究结果表明:在用量为2～20mg/L的范围内，CGAAC能明显改善污泥的沉降性能和过滤性能，其脱水性能优于阳离子絮凝剂PAM-C。
王杰, 肖锦, 詹怀宇
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Zhongguo shiyan zhenduanxue, 2018 目的探讨血清总铁结合力(TIBC)对慢性肾功能不全诊断的临床价值。方法选取30例慢性肾功能不全患者作为实验组与30例健康人作为对照组,分析两组血清TIBC的水平;ROC曲线评估TIBC对慢性肾功能不全诊断的价值;Kappa检验分析TIBC对慢性肾功能不全诊断与肌酐诊断结果的一致性。结果慢性肾功能不全组的血清TIBC为(40.86±7.54)μmol/L,而对照组血清TIBC为(61.96±7.48)μmol/L,差异有统计学意义(t=10.87 ...
武标, 徐丽丽
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
core
International Journal of Applied Linguistics, EarlyView.ABSTRACT Research on English‐Medium‐Instruction (EMI) highlights inadequate support for students transitioning from L1‐medium‐instruction to EMI. To date, little research has focused on how L2 students’ adaptation to an EMI environment influences their L2 learning motivation (LLM).
Kevin W. H. Tai
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