Results 31 to 40 of about 238,625 (167)
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
中国核心通货膨胀率的估计——基于卡尔曼滤波和多元HP滤波的比较 [PDF]
, 2013 基于卡尔曼滤波和多元HP滤波的核心通货膨胀率估计方法充分考虑到了变量之间的联系,比基于一般统计方法的估计趋势平稳性更好。卡尔曼滤波和多元HP滤波联合估计的核心通货膨胀率预测效果比较好,因为它吸取了两者的长处,并克服了简单滤波的机械性。应用卡尔曼滤波和多元HP滤波方法估计核心通货膨胀率比较适合我国的国情 ...
陈永志, 吴锦顺
core
四川大学学报. 自然科学版, 1992 设X1,…,Xn为取值d维离散分布的iid样本,本文讨论了离散概率P（x）的核估计,在积分均方误差（MISE）准则下,优于常见的频率型估计及相应的一些性质.
孙平
doaj
Logistic回归和支持向量机在电缆老化状态评估中的应用与比较
Gaoya dianqi, 2023 电缆老化状态评估主要有物理模型和统计模型两大类，物理模型一般用于电缆个体老化评估，但难以用于在线评估，统计模型一般用于电缆整体老化评估，无法评估个体状态。为建立电缆运行数据与电缆老化状态之间的关联关系，在线评估电缆个体老化状态，文中提出了基于机器学习的电缆老化状态评估方法，建立了Logistic回归和支持向量机这两种机器学习模型，采用十折交叉验证对模型准确率进行了评估，同时计算了模型的F1-Score。结果表明支持向量机采用多项式核时的总体样本准确率平均值为96%，高于Logistic回归 ...
谭笑 +5 more
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Semiparametric estimation of SVM in frameable RKHS(标架型RKHS中的SVM的半参数估计)
Zhejiang Daxue xuebao. Lixue ban, 2008 在基于标架型的再生核希尔伯特空间中，研究了SVM算法下，解的对偶形式和原形式之间的关系，进而将SVM算法与最小二乘法相结合，讨论了支持向量机的半参数估计.
ZHOUDe-qiang(周德强)
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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
四川大学学报. 自然科学版, 1994 线性模型ｙ＿ｉ＝ｘ＿ｉ＇β＋ｅ＿ｉ，ｉ＝１，…，ｎ，的误差序列有未知密度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＿１估计的残差．
张文扬, 张鸣
doaj
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
, 2008 文章从估计范围、估计精度和运算复杂度等方面,对现有的5种频偏估计算法进行研究和仿真,给出了算法的选择依据和详细的分析结果。在此基础上,研究了利用差分相关法、基于TS0的Midamble码与SYNC-DL码的联合频偏估计算法,分析了估计范围和运算复杂度。通过仿真发现,该算法可以将频偏控制在±0.05×10-6之内,较好地实现了精确的频偏估计 ...
任修坤, 沈战峰, 梁云, 白晓络
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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