Results 41 to 50 of about 28,261 (190)
Shuitu Baochi Xuebao, 2016 以胶东半岛丘陵区7个集水区为研究对象，采用SA模型提取研究区冲沟系统，测算冲沟沟长盒维数，分析沟长分形特征及其与地形参数和土地利用类型间的关系，厘定研究区内冲沟发育演化的特征及规律。结果表明：(1) 东部构造活动性强的隆起区分维值明显高于西部构造活动性弱的沉积凹陷区沉降区，沟长分形特征主要受区域地质构造控制。(2) 沟长分维数与平均坡度、地表粗糙度、剖面曲率、沟壑密度和沟头密度等地形参数之间相关性显著，而与集水区面积和沟长没有相关性。(3) 沟头密度、沟壑密度与沟长分维数间具有极显著正相关性 ...
王 +4 more
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Automating the analysis of public saliency and attitudes toward biodiversity from digital media
Conservation Biology, EarlyView.Abstract Measuring public attitudes toward wildlife provides crucial insights into human relationships with nature and helps monitor progress toward Global Biodiversity Framework targets. Yet, conducting such assessments at a global scale presents challenges.
Noah Giebink +8 more
wiley +1 more source
TEG血栓弹力图同常规凝血试验的关系及TEG血小板图试验的临床应用
Zhongguo shiyan zhenduanxue, 2012 目的探讨TEG血栓弹力图试验同常规凝血试验的关系,并回顾分析TEG血小板图试验监测抗PLTs药物的临床效果。方法①100例患者,每位分别同时抽取静脉血,做TEG血栓弹力图、常规凝血（aPTT、PT、TT、Fbg）和血常规检测。采用线性相关与回归、多元线性回归与偏回归,评估各参数间关系。②对TEG血小板图试验监测抗PLTs药物的疗效进行回顾性分析。③着重分析MA与PLTs数量的关系。结果 ①MA和CI值均分别与Fbg、PLTs和aPTT,R与aPTT、PT和TT,A与PLTs、aPTT ...
谭延国, 张岩, 王芳, 孙莉
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湘中山地土壤线虫(Nematoda)生态地理群的研究 [PDF]
, 1992 作者对湖南南岳衡山和长沙岳麓山土壤线虫进行了两年多的定位研究,共获得18511条土壤线虫标本.经分类鉴定,计有24个种 ...
伍惠生, 张友梅, 王振中
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Conservation Biology, EarlyView.Abstract The design of experiments to investigate the combined effects of multiple stressors requires exposing target organisms to multiple combinations of stressor doses. Concurrent manipulation of stressors is often infeasible with wildlife, but long‐lasting health effects allow individual health to be used as an integrator of prior stressor exposure.
Enrico Pirotta +24 more
wiley +1 more source
Gaoya dianqi, 2022 合理控制高压断路器的关合和开断时刻可以在一定程度上降低系统中的暂态过程，选相关合和开断一直是高压断路器在工程应用中的关注点。文中通过等效电路建立了高压交流断路器不同期短路关合过程计算的数值分析模型，可以计算得到任意时刻的全电流、断口电压、交流分量电流和直流分量电流。通过验算国家标准GB/T 30846—2014第4.102规定的短路关合峰值系数验证了计算模型的正确性，并计算了中性点有效接地系统不同期短路关合的峰值系数。最后，应用两个算例分析与讨论了中性点有效接地系统和非有效接地系统中断路器的选相关合技术，
李志新, 吴限, 苑婷, 毛武平
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近25 a 银川市城市化进程中热力景观格局演变分析 [PDF]
, 2016 ： Based on the Landsat images and statistical data，in this paper the urbanization process and thermal landscape dynamics of Yinchuan City were analyzed． The objectives of this study were as follows: ① To analyze the spatial and dynamic characteristics of
吕荣芳, 张建明, 王浩, 王鹏龙
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Conservation Biology, EarlyView.Abstract Human development is a driver of global change and a major threat to biodiversity. Protected areas maintain and support biodiversity, but outside stressors, such as climate change and land use change, can negatively influence natural resources within protected areas.
Leah J. Rudge +2 more
wiley +1 more source
Zhejiang Daxue xuebao. Lixue ban, 2005 利用多元线性回归和偏最小二乘分析方法，研究分子表面静电势参数，VolSurf参数与双十四酰基磷脂酰基胆碱(DMPC)-水分配系数之间的定量结构-性质关系(QSPR)，均得到较好的结果.分子表面静电势参数分析表明化合物分子表面上负的静电势越分散，越倾向于分配在水相中；与水分子的作用越强，越有利于分配在水相中.此外，具有较大体积和偶极密度的分子倾向于分配在弱极性相中.VolSurf参数分析表明大体积的分子易于分配在DMPC中;分子表面亲水区域较大的分子则倾向于分配在水相中 ...
HUGui-xiang(胡桂香) +5 more
doaj +1 more source
International Journal of Applied Linguistics, EarlyView.ABSTRACT Previous research has established the relationships between motivation, anxiety, teachers’ support, and self‐regulated learning (SRL) in English‐as‐a‐foreign‐language (EFL) learning. Most of the studies, however, have taken a variable‐centered approach in addressing the variable correlations, while learners’ characteristics and variable links ...
Yuhong Jiao, Barry Bai, Jing Li
wiley +1 more source