Results 61 to 70 of about 256,015 (173)
Study on the distribution of city size and reasonable city size ——Take Fujian Province as an example [PDF]
, 2016 福建省同台湾隔海相望，且地处我国两大城市群之间，拥有大量的海外侨胞，加上“海上丝绸之路”核心区以及自贸区建设等一系列政策的支持，城市经济迎来了新的发展机遇，城市吸纳人口的引力越来越强，城市规模也随之扩张。在这样的背景下，福建的城市体系分布与规模结构更应该与地区经济发展状况和资源环境容量相适应。因而探讨福建城市的规模分布和合理规模大小等问题具有重要的现实意义。 本文首先通过对福建省的23个县级以上的城市人口、用地和经济规模的结构分布进行研究。通过首位度、位序-规模法则等方法分析发现 ...
谢晓琼
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Conservation Biology, EarlyView.Abstract Bycatch in fisheries is one of the most serious threats to pelagic seabirds, causing major population declines. Mitigation measures can reduce bycatch substantially, but many fisheries fail to apply best practices, and seabird mortality remains high.
V. Warwick‐Evans +2 more
wiley +1 more source
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 Knowledge of species distributions is essential for informing policies on nature conservation and restoration. However, updating them on a regular basis and doing so in a harmonized manner at the international level is difficult. The European Bird Census Council integrated national monitoring data covering 5 years to update farmland bird ...
Sergi Herrando +54 more
wiley +1 more source
Gaoya dianqi, 2006 建立数学模型计算了复合绝缘子的沿面电场分布,利用有限元法计算了220kV线路复合绝缘子不安装均压环及安装不同形状尺寸均压环时沿面场强分布和电位分布。分析了均压环各因素变化对电场分布改善效果的影响,指出环径和罩深对端部电压分布改善效果明显,管径对电场分布改善效果好,根据各因素的综合影响,推荐了220kV复合绝缘子均压环的结构参数。
卫李静 +5 more
doaj
, 2019 In econometrics it is important to distinguish whether two variables are correlated or not. Distribution of correlation coefficient of n pairs of samples from two independent normal populations is theoretically known.
大嶋, 一人
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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
330 kV GIS隔离开关操作过程中电磁干扰单脉冲波形特征规律研究
Gaoya dianqi气体绝缘开关设备中隔离开关操作产生的特快速暂态过电压是威胁二次设备安全运行的重要因素。为掌握VFTO特征分布规律，文中按照实际线路参数搭建330 kV GIS隔离开关模拟干扰源试验系统，模拟现场GIS隔离开关分合操作时产生的电磁干扰过程，通过核密度估计法对提取的VFTO单脉冲波形特征数据进行了全面的统计分析。结果表明，合、分闸时单脉冲的最大峰值分布呈3峰分布，最大峰值分别分布在[25.98，294.49] kV、[33.08，305.91] kV；合、分闸时的单脉冲的持续时间分布分别呈2峰分布和3峰分布，
梅冰玉 +5 more
doaj
Dianci bileiqi, 1981 本文研究未上釉棒形抗折瓷件强度的理论分布,其分布遵循维布尔分布。各种不同因素的试验验证了理论分布的正确性。本文还对估计维布尔参数值的方法进行了讨论,且对大容量子样估计了均匀性系数m在一定置信水平下的置信区间。
马功勋, 刘长荣, 陶增炎
doaj
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