Results 41 to 50 of about 9,645 (160)
, 2018 随着社会经济的发展和人们生活方式的转变,慢性病发病率不断攀升,已成为严重困扰个人、家庭和社会的焦点问题。在世界范围内,2010年估计有3450万人死于慢性病,较20年前有明显的增加[1]。目前我国慢性病患者已超过2亿人,占总人口的20%以上,其中,2012年我国18岁及以上成人高血压、糖尿病、慢性阻塞性肺病患病率分别为25.3%、9.7%、9.9%,厦门市科技计划项目 ...
叶子容, 周鼒, 方亚, 陈佳
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Soil Particle Settlement Sorting and Distribution Characteristics of Carbon, Nitrogen and Salt During Gradual Thawing [PDF]
, 2023 [Objective] The classification of sediment particles and the accompanying distribution characteristics of carbon, nitrogen and salt in the process of soil thawing layer by layer under snowmelt runoff scenario were analyzed in order to identify the ...
Hu Yaxian +5 more
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MXene‐Based Materials: Compositional Engineering for High‐Performance Microwave Absorption
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT The rapid advancement of aerospace and electronic information technologies has imposed increasingly stringent requirements on microwave absorbing materials (MAMs), such as high absorption efficiency, lightweight, and environmental stability, making the development of advanced MAMs urgent for both civilian and national defense applications ...
Pan‐Pan Zhou +8 more
wiley +1 more source
Functional Ecology, Volume 40, Issue 3, Page 750-763, March 2026.Read the free Plain Language Summary for this article on the Journal blog. Abstract Forests worldwide are increasingly impacted by drought due to climate change, prompting plants to adapt through dehydration tolerance (DT) and avoidance (DA), two distinct physiological strategies.
Xingyun Liang +11 more
wiley +1 more source
Shuitu Baochi Xuebao, 2003 植被的分布格局与土壤性质空间异质性密切相关。对降水小于200mm地区的沙坡头无灌溉条件下流沙固定过程中土壤性质的空间变化进行了研究。结果表明,随固沙植物群落的演变和土壤成土环境的改善与生物地球化学循环过程的加强,土壤性质发生了显著的变化:(1)固沙区土壤机械组成中粘粒(0.05)。(3)不同年限固沙区间土壤性质变异差异性不显著(p>0.05);而表层(0～5cm)与结皮层土壤性质变化趋势一致,且相关性显著(r>0.807 ...
贾晓红 李新荣 王新平 樊恒文 赵金龙
doaj +2 more sources
Ｒetrieval of Secchi disk depth using MODIS satellite remote sensing and in situobservations in the Yellow Sea and the East China Sea [PDF]
, 2016 海水透明度是描述水体光学特征的一个重要参数,也是海洋水质调查中的一个重要指标。利用2个航次的黄东海透明度数据和MODIS遥感反射率数据,进行了黄东海透明度的遥感反演研究,建立了透明度单波段模型、波段比值模型、三波段模型以及基于固有光学特性的半分析模型。结果表明,三波段模型具有较高精度,反演值与实测值之间的平均相对误差为19%、决定系数为0.719、均方根误差为1.47 m。黄东海透明度估测模型的建立,有利于利用遥感影像对黄东海透明度进行全面估测 ...
周斌 +5 more
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Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT CoP has become a research hotspot for supercapacitor electrode materials because of its considerable theoretical capacitance and metalloid nature, but its commercial application remains hampered by structural instability and sluggish ion kinetics.
Gaoliang Wang +8 more
wiley +1 more source
The Research on Varying-Coefficient Spatial Panel Data Model and it’s Application [PDF]
, 2010 传统的计量经济模型默认个体在空间上具有独立性和同质性，忽略了个体的空间相关性和异质性，使得估计结果存在偏误。而空间计量模型通过引入空间权重矩阵，能够解决个体的空间相关性和空间异质性问题，因而成为近年来计量经济学研究中一个重要的研究分支。空间面板数据模型既能解决普通面板数据模型只考虑空间异质性而忽略空间相关性的缺点，又能解决截面数据空间计量模型所存在的问题，因而成为空间计量学研究中最活跃的研究领域。 但是，普通的空间面板数据模型只是利用截距项来体现空间异质性，正如Elhorst(2003)所言 ...
邓明
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Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT The covalent bonds at heterojunction interfaces enable more efficient charge carrier separation than traditional weakly coupled heterojunctions, with enhanced photocatalytic performance for organic wastewater purification. The interfacial covalent bonds drive energy band reorganization, rendering the conventional independent band edge ...
Jing‐Yu Ren +5 more
wiley +1 more source
Shuitu Baochi Xuebao, 2001 湿地土壤养分是时空连续的变异体,不论尺度大小均具有高度的空间异质性.湿地土壤养分变量属于区域化变量,同时具有随机性和结构性,仅运用经典的Fister统计方法已经不能满足土壤空间异质性研究的需要.地统计学是近几十年发展起来的一门新的空间分析方法,其变异函数则适合于定量研究区域化变量空间结构变异特征,能够全面反映区域化变量的结构性.作者在前人的工作基础上意欲用地统计学的区域化变量理论和变异函数对湿地土壤养分的空间异质性进行定量研究,并对其研究方法进行了构想.＃
白军红 余国营 张玉霞
doaj