Results 31 to 40 of about 9,645 (160)
Shuitu Baochi Xuebao, 2020 研究黄土高原侵蚀环境下林地开垦后坡面土壤养分空间分布状况，确立林地开垦后侵蚀驱动的坡地土壤养分空间变异特征。以黄土高原丘陵区子午岭林地和开垦28年的侵蚀坡面为研究对象，分析土壤主要性质和养分含量的变化情况，运用经典统计学和地统计法分析坡面土壤基本性质和养分空间分布规律。林地开垦后坡面土壤pH增加了0.24个单位，有机质、全氮、全磷和铵态氮、硝态氮、速效磷和速效钾分别降低了13.77，1.14，0.10 g/kg和6.05，1.63，4.99，58.44 mg/kg。林地的土壤有机质 ...
王昭 +6 more
doaj
Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT Engineering the semiconductor/dielectric interface is crucial for advancing two‐dimensional (2D) nanoelectronics, where device performance is predominantly governed by interfacial defects and dielectric coupling. Optoelectronic doping based on carrier trapping at the h‐BN/SiO2 interface has enabled non‐volatile and reversible carrier ...
Zhe Zhang +6 more
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Partially Linear Spatial Lag Panel Model with Fixed Effects [PDF]
, 2017 传统的计量经济学，忽略了地理空间邻近引起的数据空间相依性和空间异质性，可能导致模型估计方法和检验结果的失效或偏差。预先设定参数形式的空间计量模型具有较为强烈的主观性，对一些具体的计量问题，不足以充分刻画被解释变量和解释变量之间的潜在关系。因此本文试图构建一类半参数空间滞后面板模型，并对其估计量性质进行必要的理论推导和数值模拟验证。 Yu，Jong&Lee(2008)研究了固定效应空间动态面板数据模型的拟极大似然估计量的大样本性质，Su&Jin(2010 ...
陈剑伟
core
Estimation of global subsurface temperature anomaly based on multisource satellite observations [PDF]
, 2017 基于表层卫星遥感观测的中深层海洋遥感对于了解海洋内部异常及其动力过程有重要意义。如何从现有的海洋表层遥感观测资料提取海洋内部关键动力环境信息场是; 具有挑战性的海洋遥感技术前沿。本文采用支持向量回归(SVR)方法,通过卫星遥感观测获取的多源海表参量(海表高度异常(SSHA)、海表温度异常(S; STA)、海表盐度异常(SSSA)和海表风场异常(SSWA)),选择最优参量输入组合,感知海洋次表层温度异常(STA),并用实测Argo数据作精; 度验证。结果表明SVR模型可准确估算全球尺度的STA(1000;
严晓海, 汪小钦, 苏华, 黎文娥
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Analysis on Land Suitability for Maize and Rapeseed Production Based on Data Mining Method [PDF]
, 2022 [Objective] Conducting multi-crop land suitability analysis was carried out in order to provide an accurate and effective method for crop planning, land use planning, and management of agricultural production.
Lin Yan, Zhang Chen, Zhou Hua
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In Situ Formation of the Li3Bi Alloy Phase Interface for Robust Garnet Solid‐State Lithium Batteries
Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT Garnet‐type electrolyte Li6.4La3Zr1.4Ta0.6O12 (LLZTO) is a promising component for commercializing solid‐state batteries owing to its wide electrochemical window, good stability, and high shear modulus. However, poor interface wettability and lithium dendrite growth limit the practical application of the LLZTO electrolyte.
Pengfei You +8 more
wiley +1 more source
Shuitu Baochi Xuebao, 2023 为揭示黄土高原地区土壤可蚀性(K)的空间分布特征和影响因素,基于EPIC模型、几何平均粒径模型、Torri模型估算黄土高原地区K,并结合地理探测器比较土壤理化性质、海拔、坡度等要素对K空间分布的影响。结果表明:(1)EPIC模型、几何平均粒径模型、Torri模型估算的黄土高原地区K均值分别为0.036,0.034,0.041 。黄土高原以中可蚀性和中高可蚀性的土壤为主,不同模型对K的估算值有显著差异(F=4.460,p＜0.01)。(2)黄土高原K有较为显著的空间异质性,东部和西南地区K较高 ...
朱启明, 刘俊娥, 周正朝
doaj
The econometric analysis and countermeasure choice of PM2.5 pollution in China [PDF]
, 2017 近些年来，随着我国经济社会的快速发展，全国各省市均出现大规模的PM2.5污染。由于我国幅员辽阔，不同区域的经济社会情况存在显著差异。因此，本文从区域差异的角度出发，研究PM2.5污染的空间异质性、空间溢出性和影响因素。论文主要内容如下： （1）第一章阐述了PM2.5污染产生的背景，对国内外文献进行总结，发现影响PM2.5排放的主要因素，并对主要研究方法进行总结，提出本文可能的创新点。 （2）第二章运用地理加权回归模型研究PM2.5排放的空间异质性。首先介绍地理加权回归模型的基本理论；其次对各省PM2 ...
姚振宇
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Estimation in Partially Linear Spatial Lag Panel Model with Fixed Effects [PDF]
, 2017 本文构建了一类部分线性固定效应空间滞后面板模型,在此模型中,综合考虑了固定效应、参数自变量和非参数自变量的影响。基于截面拟极大似然估计方法对模型的参数部分和非参数部分进行了估计,并在个体数n和时期数T都很大的情况下,推导估计量的大样本表现。研究结果表明,在大样本条件下,估计量具有一致性,参数估计量满足渐近正态分布并且收敛速度为（nT）~（1/2）。We proposed a class of partially linear spatial lag panel model with fixed ...
许永洪, 陈剑伟
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Functional Ecology, Volume 40, Issue 4, Page 983-1000, April 2026.Read the free Plain Language Summary for this article on the Journal blog. Abstract Organic phosphorus mineralization is a critical process in the phosphorus cycle, governing phosphorus bioavailability for plants. The PhoD gene, which encodes the key enzyme alkaline phosphatase, serves as a valuable biomarker for this process.
Sandhya Mishra +3 more
wiley +1 more source