Results 51 to 60 of about 9,645 (160)
Zhejiang Daxue xuebao. Lixue ban, 2014 在地统计和GIS的支持下，以半方差函数为工具，研究了豫中烤烟种植区烟叶氯含量和土壤养分的空间变异性特征，并进行相关分析.运用普通克立格法进行最优无偏线性插值，制作了研究区内烤烟烟叶中氯含量和不同土壤养分的空间分布图.结果表明：研究区内烤烟烟叶中氯含量符合指数模型，其空间变异性受结构性的因素影响较大.土壤属性中，土壤全磷、有效氮、速效钾、氯含量为中等程度的空间变异性，其余的都为弱空间变异性；分维数最高的是土壤有效氮和阳离子交换量，最低的是有机质、pH和硅.相关性分析表明，烟叶氯含量与土壤pH、土壤Cl ...
CHENHaisheng(陈海生) +1 more
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On the Damage Tolerance of Diffusion Bonded Titanium–Aluminum Phase Biomimetic Composites
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT The biomimetic design principles of natural structures involve the strategic integration of stiff and compliant phases to synergistically enhance strength and toughness. Its evolutionary refined natural armor, characterized by a specialized microarchitecture, enables superior damage tolerance.
Shuai Tong +10 more
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Shuitu Baochi Xuebao, 2005 分析水电工程建设前后流域水质时空特征对于研究水电工程对流域水生生态系统以及河岸带生态系统的影响具有重要意义。以澜沧江流域中段为研究区域,通过对10多年的多个断面水质监测资料分析,研究了以铜、铅、锌、镉为代表的金属元素以及氮磷等水质指标的时空分布特征。结果表明:建坝后金属元素的空间分异性比建坝前要明显,但在库区分异性不大;运用ATU(急性毒性度)能更好地反映金属元素指标变化情况,建坝后ATU值小于建坝前,沿干流逐渐减小,时间分异性比建坝前要弱。氮和磷浓度库区比非库区要高,最大值一般出现在大坝出水不远的断面,
姚维科 杨志峰 刘卓 崔保山 董世魁 刘杰
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The impacts of habitat heterogeneity of mangroves on mollusks diversity at Dongzhaigang Bay, Hainan [PDF]
, 2016 包括软体动物在内的大型底栖动物是红树林生态系统的重要组成部分，几乎在所有的红树林生境类型中都能够发现它们的存在，其在红树林中占据了重要的生态位，通过穴居、取食等活动改变着红树林有机物循环的物理和化学过程，对红树林生态系统的结构和功能的维持具有非常重要的作用，是红树林生态系统中食物网的重要环节。本文选取了海南省东寨港国家级自然保护区内三个不同地点的红树林从空间尺度方面对其中的软体动物分布进行了研究。此外还比较了不同地点的红树植物群落内软体动物分布的特点。 选择了海南东寨港的湾口(塔市)、中部(后排 ...
章慧
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International Journal of Applied Linguistics, Volume 36, Issue 1, Page 522-539, February 2026.ABSTRACT This paper examines the features of metadiscourse across different teacher moves in university linguistics classroom discourse and the teaching strategies reflected in its use. The results reveal that teachers employ diverse metadiscourse during classroom interactions to support student reasoning.
Jingjie Li, Wenjie Hu
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Spatiotemporal evolution and driving forces of the externality value in rice production: a study of 30 provinces in China from 2000—2021 [PDF]
Research on the indirect value of rice production has primarily focused on ecosystem service functions, with less emphasis on externalities. This article conducts an innovative evaluation of the externality value of rice production and its significant ...
Luo, Lizhuang, Wu, Sibin, Zhou, Rongji
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Rare Metals, Volume 45, Issue 1, January 2026.ABSTRACT Low conductivity and poor oxygen reduction reaction (ORR) catalytic activity limit the bifunctional catalytic performance of layered double hydroxide (LDH) in zinc–air batteries. In this work, an efficient bifunctional electrocatalyst was prepared by loading nitrogen and phosphorus co‐doped carbon quantum dots (NPCQDs) onto a cationic‐vacancy ...
Wenhao Tang +4 more
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Landscape Ecology and the Application to Landscape Ecology Planning of Scenery District — Take the Wuyishan Scenery District for Example [PDF]
, 2007 景观生态规划是应用景观生态学原理及其它相关学科的知识，通过研究景观格局与生态过程以及人类活动与景观的相互作用，在景观生态分析、综合及评价的基础上，提出景观最优利用方案、对策及建议。本文系统阐述了景观生态学的基本概念、重要理论和原则，重点介绍了景观生态学中常用的景观指数数量分析方法，并以福建武夷山风景名胜区景观生态规划作为景观生态学应用研究的实例。首先，运用景观分类生态原则和群落生态原则，建立了武夷山名胜区景观二级分类系统，并在此基础上对各景观类型的生态特征进行了计算和分析 ...
陈靓
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Public perception of Ghana's Free Senior High School policy: A north–south comparative analysis
Review of Policy Research, Volume 43, Issue 1, January 2026.Abstract Ghana's Free Senior High School (SHS) policy, implemented in 2017, aims to increase access to secondary education, promote equity, enhance educational outcomes, and foster human capital development. This study examines public perception of the Free SHS policy, focusing on the variations between the northern and southern regions of Ghana and ...
Michael K. Dzordzormenyoh +3 more
wiley +1 more source
Shuitu Baochi Xuebao, 2020 为研究小流域尺度下土壤有机碳的变异规律，运用地统计学方法对研究区0—10，10—20，20—40 cm土壤有机碳含量的空间变异性进行了研究。结果表明：流域内不同土层有机碳含量属于中等强度变异，具有强烈的空间自相关性；土壤有机碳含量在0，135°方向上空间变异程度明显，空间分布的各向异性显著；克里格插值结果显示流域内阴坡土壤有机碳含量明显高于阳坡，高海拔区域土壤有机碳含量高于低海拔区域；不同土层间，土壤有机碳含量均表现为青海云杉 > 灌丛 > 草地，表明不同植被类型对土壤有机碳含量和分布有着重要影响 ...
芦倩, 李毅, 刘贤德, 赵维俊
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