Results 51 to 60 of about 1,579,839 (226)
, 2000 文章对电阻为负载时，硅光电负阻器件(SPNRD)的光电负阻特性和光学双稳态特性间的对应关系进行了系统的分析，定义了描述静态光学双稳态特性的7个基本参数，并分析了负载电阻(R_L)和电源电压(V_0)对这些参数的影响，理论分析结果与实测结果相一致 ...
李树荣 +9 more
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Comprehensive and representative conservation planning for biodiversity of ice‐free Antarctica
Conservation Biology, EarlyView.Abstract Antarctica is designated as a natural reserve devoted to peace and science, with Antarctic Specially Protected Areas (ASPAs) serving as the primary instrument for area‐based biodiversity protection. However, the existing ASPA network lacks the comprehensiveness and representativeness required under Annex V, Article 3(2), of the Madrid Protocol.
Wen Wen +3 more
wiley +1 more source
Shiyou jixie, 2014 应用Fluent软件，选用三维瞬态湍流动网格模型对双头全金属单螺杆泵做了外特性的数值模拟分析，得到轴功率、流量以及泵效随增压值的仿真变化曲线。对该泵外特性做了试验研究，给出了试验外特性曲线，对比分析了全金属单螺杆泵与常规橡胶衬套单螺杆泵的外特性。分析结果表明，基于Fluent的数值模拟方法能够准确模拟该泵实际外特性；随着增压值的增大，流量近似线性减小，轴功率近似线性增大，泵效先增大后减小，存在最优工作区间；介质黏度对泵的流量特性影响显著，相比常规螺杆泵，不存在硬特性。
姜东, 石白妮, 李增亮, 郭海滨
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Conservation Biology, EarlyView.Abstract Qualitative approaches are increasingly applied in conservation social science, yet methodological reflection remains limited. Member checking, a process of returning findings to participants for feedback, is widely recognized outside conservation as a means to enhance rigor and reciprocity, but it is rarely reported in conservation research ...
Judith J. Rakowski +6 more
wiley +1 more source
, 1997 本文简单介绍了各种先天性色觉异常的特性及常用的色觉检查方法。不同类型的先天性色觉异常在颜色匹配、光谱感受性、色差辨别等方面均表现出不同的特点，色觉检查方法就是在这些特点的基础上，根据异常者的某一色觉缺陷设计的。常用的检查方法有假同色图测验，色相排列测验和色盲镜等。一般来说，不同的检查方法各有所长 ...
许宗惠, 池海宏, 孙秀如
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Intact coastal nursery rearing amid climate‐driven phenological shifts in threatened salmon
Conservation Biology, EarlyView.Abstract Literature linking phenology to climate has proliferated in recent decades and shows that climate change has reorganized seasonal opportunities worldwide. However, this literature often quantifies changes in point measures of timing (e.g., beginnings and peaks) without context about duration (e.g., rearing season length) or performance (e.g ...
Stuart H. Munsch +8 more
wiley +1 more source
华西箭竹(Fargesia nitida)种子特征及其萌发特性
, 2007 华西箭竹(Fargesia nitida)是大熊猫天然采食的主要竹种之一,由于开花习性独特,对其种子的研究报道还很少见。对华西箭竹种子的基本特征及不同温度下的萌发特性进行了研究。结果表明:华西箭竹种子长为(5.01±0.43)mm、宽(1.99±0.18)mm、厚(1.72±0.13)mm、千粒重(11.51±0.07)g;风干种子的化学组成:水分含量为(10.22±0.36)%、淀粉(74.52±0.57)%、粗蛋白(7.54±0.32)%、粗脂肪(3.71±0.17)%、可溶性糖(2.94±0 ...
刘庆, 赵春章
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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
wiley +1 more source
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
wiley +1 more source
Zhongguo shiyan zhenduanxue, 2008 目的探讨Y染色体微缺失与男性特发性不育及非特发性不育间的关系。方法利用染色体核型分析、PCR技术、血清内分泌激素及精浆果糖定量检查,对324例男性不育患者（特发性不育206例,非特发性不育118例）和60例正常生育男性进行研究。结果60例正常男性未检测出微缺失;206例特发性不育患者微缺失20例（20/206,9.71%）;21例染色体异常患者微缺失5例（5/21,23.81%）;91例精索静脉曲张患者微缺失10例（10/91,1 0.99%）;2例唯支持细胞综合症和4例高泌乳素血症患者未见缺失 ...
戴汝琳 +5 more
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