Results 31 to 40 of about 285 (67)
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT The Schottky barrier height (SBH), which serves as a pivotal determinant of charge carrier injection efficiency in electronic devices, critically governs electrical behavior at metal/semiconductor interfaces. However, pronounced metal‐induced gap states at metal contact interfaces induce Fermi‐level pinning, which constrains the ...
Xiaofei Liu +10 more
wiley +1 more source
四川大学学报. 自然科学版, 1990 线性模型yi=x′iθ+ei,i=1…n,的误差序列{ei}in=1有未知密度f（x）,本文在一定条件下证明了f（x）的核估计的弱相合性,逐点强相合性,一致强相合性,其中（?）为L.S估计的残差.
张文扬
doaj
Study on the inference method of logistics costs(物流成本的推断方法研究)
Zhejiang Daxue xuebao. Lixue ban, 2011 原本方物流成本和第三方物流成本会因各自条件明显欠缺而难以集中并进行会计核算.尽管如此，却可以运用统计方法对它们进行估算，即在理清物流成本结构的基础上，分别对物流需求者和物流经营者总体的有关特征进行抽样推断，进而估算出原本方物流成本和第三方物流成本以及由它们合成的物流供给成本.抽样推断方法具有科学性和可操作性，能有效解决物流成本估算问题，其应用成果为制定物流发展规划或设计物流建设方案提供了依据，为解决物流卫星账户构建之瓶颈问题奠定了重要基础.
GUOQing-guang(郭庆广)
doaj +1 more source
Genetic origins and climate‐induced erosion in economically important Asian walnuts
Conservation Biology, Volume 40, Issue 1, February 2026.Abstract The global climate is undergoing unprecedented changes, posing significant threats to species persistence. However, the spatiotemporal impacts on genetic diversity remain poorly understood, hindering species conservation and management. Walnuts, generally referred to as Juglans regia and J. sigillata, are economically vital in Asia, but little
Peng‐Zhen Fan +17 more
wiley +1 more source
XpertMtb/RIF技术对结核病以及耐药结核病的诊断应用价值
Zhongguo shiyan zhenduanxue, 2018 据WHO统计,我国是全球22个结核病流行严重的高负担国家之一,结核病患病人数高居全球第2位,同时也是全球27个耐多药结核病流行严重的高负担国家之一,耐多药结核病患者的估计人数高居全球第1位[1]。而传统的诊断标准是抗酸杆菌染色法和结核分枝杆菌培养药敏法,抗酸染色法敏感度较差,阳性率低 ...
张永强 +5 more
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Telephone Communication, ICT Use, and Digitalization in Healthcare Performance
World Affairs, Volume 189, Issue 1, Spring 2026.ABSTRACT This study explores the impact of telephone communication, ICT use, and digitalization on healthcare performance in sub‐Saharan Africa (SSA), a region facing challenges such as limited infrastructure and resources, geographical barriers, and a high disease burden.
Emmanuel K. Manu +2 more
wiley +1 more source
四川大学学报. 自然科学版, 2006 数字视频中的动态目标分割是基于计算机视觉技术的分析、识别系统中关键的处理步骤,分割结果的正确率决定了后期分析或识别过程的质量.在数字视频中存在各种有害动态像素,它们会降低分割过程的正确率.动态目标的阴影是这些有害像素的一种,因为它们本身不属于动态目标形状信息的范畴,但分割过程却能很容易将它们作为有效的动态目标像素分割出来.最近有关动态目标分割的研究提出了基于核心密度估计模型的分割方法.基于RGB颜色空间的核心密度估计模型能够在彩色视频中抑制阴影,但是对于灰度视频这种模型是无法抑制阴影的 ...
李征, 杨舰, 琚生根, 张胜
doaj
Downlisting and recovery of species assessed by the IUCN
Conservation Biology, Volume 39, Issue 6, December 2025.Abstract Despite the increasing number of species assessed for extinction risk by the International Union for Conservation of Nature (IUCN) (163,040 species as of 2024), only about 1 in 1,000 have been downlisted due to genuine population improvement. Although this rare conservation achievement has been widely celebrated in several recent cases, some ...
Mu‐Ming Lin +7 more
wiley +1 more source
He jishu利用就地γ能谱测量结果评估环境放射性核素水平时，需要计算放射性核素比活度与γ能谱特征峰计数率之间的转化系数。转化系数计算本质上是对周围材料中不同空间位置放出γ射线的探测效率进行积分，但在复杂几何下积分式难以进行数值求解，限制了方法的使用范围。本文提出了一种蒙特卡罗模拟与数值积分结合的转化系数计算方法：通过蒙特卡罗随机抽样解决复杂几何积分问题，并通过输运虚拟粒子提升蒙特卡罗模拟效率。将方法应用于中国锦屏地下实验室（China Jinping Underground Laboratory，CJPL ...
张 鹏 +6 more
doaj +1 more source
A Multidimensional Operationalization of Policy Change
Politics &Policy, Volume 53, Issue 5, October 2025.ABSTRACT Policy change is a core variable of policy process research. Several theories and frameworks distinguish different levels of policy change. These include minor change vs. major change (Advocacy Coalition Framework), incrementalism vs. nonincrementalism (Multiple Streams Framework), punctuations vs.
Nils C. Bandelow +2 more
wiley +1 more source