Results 21 to 30 of about 238,625 (167)
He jishu海洋核动力小堆作为未来海洋核能应用的重要形式，其热工水力特性受到周期性流体波动和复杂运动的影响，增加了设计与安全评估的挑战。本研究旨在开发一种多尺度分析方法，通过适应性改造和多层次模拟，系统评估海洋条件下核动力小堆的热工水力行为与安全性。首先，选用STAR-CCM+作为改造系统分析、子通道和计算流体力学（Computational Fluid Dynamics，CFD）等程序的工具，对RELAP5源程序进行了修改，对海洋小堆进行简化建模，以适应海洋环境下的系统行为、组件传热、燃料棒束等关键特性；其次 ...
罗 涵禹, 宋 厚德, 刘 晓晶
doaj +1 more source
How much biotic nativeness matters across human demographic groups
Conservation Biology, Volume 40, Issue 2, April 2026.Abstract Many central concepts of conservation biology—such as nativeness—are structured by ecological and social factors. However, the social consequences of using these concepts to make conservation decisions remain inadequately understood. Some researchers argue that nativeness, rather than acting as an objective proxy for important ecological ...
Harold N. Eyster, Rachelle K. Gould
wiley +1 more source
Use of a Cytobrush for Sampling the Ear Canal of Dogs With Otitis Externa
Veterinary Dermatology, Volume 37, Issue 2, Page 227-235, April 2026.Cytological examination of the ear canal is essential for evaluating dogs with otitis externa (OE). The conventional sampling method uses a swab. However, the cytobrush (gynaecological cervical brush), already used for cytological collection from other anatomical sites, has not been adequately investigated for this purpose in dogs with OE.
Nicoly Radaeli Atanasio +3 more
wiley +1 more source
, 2009 COPulA函数包含了变量的边际分布和变量间的相关结构两方面的信息。用COPulA函数可以很灵活地构造相关结构和边际分布不同的联合分布函数。ArCHIMEdEAn COPulA函数在金融市场分析中很有用。在用COPulA理论建模的过程中有一个很重要的环节是参数估计。文章采用对边际分布不作具体假设的非参数核密度方法来估计ArCHIMEdEAn COPulA的参数 ...
赵丽琴, 籍艳丽
core
四川大学学报. 自然科学版, 2007 在医学诊断检测中,对于连续的检测结果,通常用ROC曲线来测量其准确性.作者研究了常用的ROC曲线的非参数估计,并给出一种新的核光滑估计方法.使用这种新方法,不但可以减少均方误差,而且只需用一个窗宽来估计,克服了Lloyd方法的缺点.
周永道, 宋捷, 赵永红
doaj
Integrative Conservation, Volume 5, Issue 1, Page 16-32, March 2026.A review of 192 articles published between 1985 and 2023 revealed that human–jaguar conflict literature has focused on the human dimensions of conflict, jaguar killings, attacks on domestic animals and humans, and management. Several research gaps remain including: policy enforcement, interdisciplinary research, relevant geographic locations and ...
Angelica Solano +2 more
wiley +1 more source
, 1991 本文以(由页)塘河为例,研究了中小河流水质模型参数,提出了一整套更为简便易行的估计中、小河流模型参数的方法,分析了准确估计模型参数的影响因素,得到了适用于(由页)塘河水质模型参数K_1、K_2、K_3及D_L的估计结果.该结果可直接应用于(由页)塘河的水质数值模拟,对于其它中 ...
徐丰
core
四川大学学报. 自然科学版, 2005 运用泰勒展式讨论了非参数回归模型中未知误差分布函数f(e)的核密度估计^fn(e)的渐进性质,以及估计量^fn(e)中光滑参数的选择,并给出了f(e)的置信区间.
余萍, 鲁万波
doaj
Zhongguo shiyan zhenduanxue, 2020 迄今为止,结核病依然是全球范围内重要的传染病以及重大公共卫生问题。世界卫生组织(WHO)2018年全球结核病报告显示,2017年全球新增结核病人1000万例,同时因病死亡的人数高达160万。估计2017年全球共新增55.8万耐利福平的结核病人,其中 ...
王慧 +6 more
doaj
Zhejiang Daxue xuebao. Lixue ban, 2014 设{Xn，n≥1}是同分布的WOD随机变量序列，具有共同的密度函数f(x)，利用WUOD序列的指数不等式，在适当条件下获得了 WOD样本下密度函数核估计的强相合性.
SHIShengta(施生塔) +1 more
doaj +1 more source