Results 31 to 40 of about 4,083 (137)
Gaoya dianqi, 2019 深井接地极因占地面积小,选址容易的优点,具有很高的工程实用价值。由于单根深井接地极最大对角线距离不到1 m,明显不宜直接采用规程推荐的5倍对角线距离人工布线测量接地电阻。为此,文中建立了直流深井接地极模型,仿真计算了其接地电阻和地表电位分布,基于之提出了电流极距离要求;建立了深井接地极注流、电流极回流的模型,研究了接地电阻测量过程中深井接地极和电流极共同作用下的地表电位分布规律;结合深井接地极接地电阻的仿真计算值,分析获得了电压极的布置要求。改变电流极和电压极的位置,研究了测量误差与布线距离之间的关系 ...
陈家峰 +6 more
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Adaptive Knot Placement in Non-uniform B-spline Surface Fitting [PDF]
, 2015 针对非均匀b样条的节点设置问题,提出一种利用非均匀b样条曲面拟合离散数据的迭代算法,通过优化节点分布来改进拟合曲面的质量.该算法以带参数化的三角网格曲面为输入,在首次迭代中根据输入曲面的几何特征将其对应的参数域划分成若干个子区域,并使得每个子区域上累积的几何特征信息量近似相等,子区域的重心坐标将取为首次迭代的节点;在随后的迭代中,保证前次迭代生成的重心位置固定不变,并根据前次迭代得到的曲面拟合误差再次将区域划分成累积误差接近相等的子区域,新增加的子区域重心的坐标选为拟加入的节点 ...
曹娟 +3 more
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Integrative Conservation, Volume 4, Issue 3, Page 302-309, September 2025.We discussed the key assumptions of Distance sampling that were considered hard to meet in mountainous terrains and potential solutions for them. Our survey yielded comparable estimates from distance sampling and double‐observer survey, although the confidence interval from distance sampling was broader.
Lingyun Xiao +4 more
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Integrative Conservation, Volume 4, Issue 3, Page 503-513, September 2025.Fire occurrence increased with proximity to roads and villages, indicating that human access and activity are major drivers of fire risk. We analyzed spatial patterns of fire in relation to human settlements. Our findings highlight the need for fire management strategies that consider accessibility and human presence in conservation planning.
Aung Lin +4 more
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野生动物学报, 2011 2009年3月,采用样线法、样点法对辽宁双台河口自然保护区内迁徙停歇的丹顶鹤进行观察监测,确认并用GPS定位其停歇地;通过样方法、因子测定法进行对其停歇生境进行实地测量与分析。结果表明:（1）芦苇沼泽是丹顶鹤主选的停歇生境,占到96.4%;（2）丹顶鹤停歇地与火烧地的距离小于25 m,在火烧地边缘活动,或者停在火烧地中;（3）丹顶鹤一般会选择油井距离大于1 km处作为停歇地（100%）;（4）丹顶鹤距明水面的距离较近,便于获取食物与水等;（5）频繁区对丹顶鹤影响明显 ...
金洪阳, 郝萌, 杨玉成, 邹红菲
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Gaoya dianqi, 2020 频率响应分析法是检测电力变压器绕组变形的常用诊断方法之一。近年来,频率响应分析法的检测流程趋向标准化,但寻求合适的算法对频响曲线数据进行量化分析仍需深入研究。文中将频响曲线数据的量化分析看作一个概率分类问题,提出了应用欧氏距离分析诊断变压器绕组变形程度和类型的新方法。研究结果表明,欧氏距离分析能够有效地对变压器绕组变形程度进行诊断,且与先前研究提出的数学指数方法相比,该方法对变形程度的诊断结果具有更高的线性度。同时,在检测频段分段后获取子频段的欧氏距离分布的基础上 ...
张重远 +6 more
doaj
Landscape‐scale predictions of future grassland conversion to cropland or development
Conservation Biology, Volume 39, Issue 1, February 2025.Abstract Grassland conservation planning often focuses on high‐risk landscapes, but many grassland conversion models are not designed to optimize conservation planning because they lack multidimensional risk assessments and are misaligned with ecological and conservation delivery scales.
Kevin W. Barnes +2 more
wiley +1 more source
Gaoya dianqi电缆隧道接地网具有超细长结构，利用远离法测试布线长度巨大，目前没有针对长距离电缆隧道接地阻抗测试的成熟方法。因此文中建立典型电缆隧道接地网模型，研究了电缆隧道超细长型接地网地电位分布，从三极法的原理出发提出了一种电缆隧道接地网接地阻抗的现场测试方法。同时从隧道接地网散流特性出发，提出了针对长、短距离隧道接地网的不同测试方法。长距离隧道中间位置发生短路时隧道两端变电站散流很少，测试时可以忽略两端变电站接地网。但变电站接地网存在短路分流，文中计算了分流系数，对接地阻抗进行了修正 ...
任志刚 +6 more
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Eyes on nature: Embedded vision cameras for terrestrial biodiversity monitoring
Methods in Ecology and Evolution, Volume 15, Issue 12, Page 2262-2275, December 2024.Abstract We need comprehensive information to manage and protect biodiversity in the face of global environmental challenges, and artificial intelligence is required to generate that information from vast amounts of biodiversity data. Currently, vision‐based monitoring methods are heterogenous; they poorly cover spatial and temporal dimensions, overly ...
Kevin F. A. Darras +11 more
wiley +1 more source
Identification, spatial distribution, and associated factors of urban protected areas in China
Conservation Biology, Volume 38, Issue 6, December 2024.Abstract The increasing proximity between protected areas (PAs) and urban areas, which can lead to urban protected areas (UPAs), is now commonplace. Use of Euclidean distance to measure the distance between PAs and cities has not correctly portrayed the spatial relationship between PAs and cities.
Zuo Zitong, Wang Shuyi, Zhong Le
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