Results 51 to 60 of about 39,766 (300)
Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract Plant phenology is crucial for understanding plant growth and climate feedback. It affects canopy structure, surface albedo, and carbon and water fluxes. While the influence of environmental factors on phenology is well‐documented, the role of plant intrinsic factors ...
Yunpeng Luo +8 more
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Guangtongxin yanjiu, 2003 利用光脉冲在光纤中传播时所遵守的相干非线性薛定谔耦合方程,研究了线偏振光在双折射色散缓变光纤中的传输特性.结果表明,线性双折射、非线性效应和色散的相互作用,使光的偏振状态发生变化,产生交叉相位调制（XPM）,从而导致相位匹配参量的四波混频.这一过程不仅在反常色散区产生,在正常色散区也能产生,并且当传输距离发生变化时,也随之发生变化.
贾维国, 杨性愉
doaj
Probing and tunning the light-matter and electron-matter interaction in the quantum regime [PDF]
, 2016 对光子和电子与物质相互作用的探知与解读、相互作用行为的驾驭与改造是当今凝聚态物理研究的前沿热点，本论文面向该研究领域，以搭建实验平台为起步，以构建优良材料体系为基础，多方位发掘并呈现体系中的相互作用行为，旨在澄清其背后的物理图像与核心机制，并以此为支点，进一步开展更具目的性的量子行为调控。研究内容与研究意义可简要概括为如下几点： 开发新表征技术：我们首先致力于原位综合表征系统这一实验平台的搭建，并进一步发展了双扫描隧道探针表征技术，以及光纤探针配合下多探针协同的微区光学表征技术 ...
李孔翌
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Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract Decomposition is the transformation of dead organic matter into its inorganic constituents. In most biomes, decomposition rates can be accurately predicted with simple mathematical models, but these models have long under‐predicted decomposition in globally extensive ...
Heather L. Throop +8 more
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颅内外动脉粥样硬化相关因素的差异 Differences in Related Factors of Intracranial and Extracranial Atherosclerosis
Zhongguo cuzhong zazhi, 2018 目的 探讨颅内外动脉粥样硬化的相关因素是否存在差异。 方法 在中国颅内动脉粥样硬化研究的数据库中，将患者分为4组：无显著颅内外动脉狭窄或闭塞组、 单纯颅内动脉病变组、单纯颅外动脉病变组及颅内合并颅外动脉病变组。以无显著颅内外动脉狭窄 或闭塞组作为参考，应用多元Logistic回归分析，评估颅内外动脉病变的相关因素。 结果 共入组2864例缺血性脑血管病患者，其中无显著颅内外动脉狭窄或闭塞组1388例（48.5%）、 单纯颅内动脉病变组1074例（37.5%）、单纯颅外动脉病变组141例（4.9 ...
濮月华，邹昕颖，王伊龙，潘岳松，向祥龙，苏霭欣，梁慧康，赵性泉，王春雪，黄家星，王拥军，刘丽萍
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Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract Plants assemble beneficial rhizosphere microbiomes through a ‘cry for help’ mechanism upon pathogen or insect herbivore attack. The arbuscular mycorrhizal fungi (AMF) can influence the composition of microbial communities in the plant rhizosphere. However, their impacts
Yingde Li +6 more
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Guangtongxin yanjiu, 2014 在时相调制系统中引入了ICA（独立成分分析）技术,根据多个传感器端口接收的多路时相调制信号的混叠信号,采用快速ICA算法将其分离成相对独立的几个部分,借此提取时相调制信号的相位突变特征,实现了对时相调制信号的检波解调。仿真结果表明,ICA技术不仅能够提取时相调制信号的相位突变特征,而且效果明显。
赵培洪 +3 more
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Zhejiang Daxue xuebao. Lixue ban, 2015 采用组合的量子化学ONIOM(B3LYP/6-31 + + G(d，p)：UFF）方法，研究了限域在SWCNT(9，9)内α-丙氨酸的分子结构和手性转变机制.为得到相对高水平的体系能量和反应势能面，在ONIOM(B3LYP/6-311 + + G(3 df, 3 pd):UFF)水平上计算了各个包结物的单点能.分子结构分析表明：与单体α-丙氨酸相比，受限在SWCNT (9, 9)碳纳米管内时，键长均略缩短，骨架原子的二面角基本不变.反应路径研究发现，α-丙氨酸分子在SWCNT(9，9 ...
WANGZuocheng(王佐成) +4 more
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Multiple global change factors alter the scaling of nitrogen to phosphorus in alpine plants
Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract The stoichiometry and allometry of nitrogen (N) and phosphorus (P) reflect nutrient absorption and dynamic allocation by plants, and can be regulated by global change factors (e.g. nitrogen enrichment, climate warming and altered precipitation). Yet, how multiple global
Jiapu Li +10 more
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Global drivers of the conservation–invasion paradox
Conservation Biology, EarlyView.Abstract The conservation–invasion paradox (CIP) refers to a long‐term phenomenon wherein species threatened in their native range can sustain viable populations when introduced to other regions. Understanding the drivers of CIP is helpful for conserving threatened species and managing invasive species, which is unfortunately still lacking. We compiled
Yanhua Hong, Zhiyong Yuan, Xuan Liu
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