Results 141 to 150 of about 43,544 (260)

Internal physiological drivers of leaf development in trees: Understanding the relationship between non‐structural carbohydrates and leaf phenology

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, Constantin Zohner, Thomas W. Crowther, Jianlan Feng, Günter Hoch, Peng Li, Andrew D. Richardson, Yann Vitasse, Arthur Gessler   +8 more
wiley   +1 more source

液压操作机构中阀的动作时间计算之探讨

Gaoya dianqi, 1979
配液压机构断路器的固有分闸时间的长短,受操作机构中阀的动作快慢的影响。本文就阀的动作时间的几种算法进行了分析探讨,并以平顶山高压开关厂研制的380千伏少油断路器液压机构中二级锥阀动作时间为例,进行了实际的工程上的计算。在计算有分支的液路时,为解决速此K确定上的困难,采用了经验性的减化算法。
杨成汉
doaj  

Scaling from microsite to landscape to resolve litter decomposition dynamics in globally extensive drylands

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, Jiwei Li, Daryl L. Moorhead, Sasha C. Reed, Katherine E. O. Todd‐Brown, Alexi C. Besser, Dellena Evelyn Bloom, Thomas C. Ingalls, Alejandro Cueva   +8 more
wiley   +1 more source

基于介质损耗分析研究变频电机绝缘老化特性

Gaoya dianqi, 2008
变频牵引调速电机匝间绝缘承受来自逆变器的连续高压脉冲方波的作用,其老化机理与工频正弦电压作用下具有很大差异。笔者通过采用两种电压源对模拟变频电机匝间绝缘和对地绝缘的绞线对试样进行老化试验,测量了tanδ随老化时间的变化趋势,分析了电压形式对匝间绝缘和对地绝缘介质损耗产生和发展的作用机理。试验结果表明:脉冲电压下,匝间绝缘内部有放电发生时,放电与空间电荷协同作用使绝缘缺陷迅速增多;无放电时空间电荷反复注入和抽出造成绝缘损伤。交流电压下绝缘介质发热主要由局部放电造成,而脉冲电压下主要是由空间电荷所导致 ...
何景彦, 吴广宁, 高波, 郭小霞
doaj  

The coordination of dehydration tolerance and avoidance in oaks is mediated by leaf habit across a precipitation gradient

Functional Ecology, EarlyView.
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, Bo Cui, Xiaoyi Wang, Hui Liu, Pengcheng He, Deyi Yin, Weize Tang, Yangsiding Wang, Liangning Liao, Qiang Xia, Guilin Wu, Qing Ye   +11 more
wiley   +1 more source

Elevation, soil pH and calcium availability shape regional and local scale spatial patterns of PhoD gene abundance in tropical and subtropical forests

Functional Ecology, EarlyView.
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, Shangwen Xia, Wenting Wang, Xiaodong Yang   +3 more
wiley   +1 more source

[Efficacy and safety of super electroconvulsive therapy for treatment-resistant depression: a retrospective analysis of 292 cases]. [PDF]

Nan Fang Yi Ke Da Xue Xue Bao
An J, Chi Z, Zhao C, Li Y, Wang R, Hu Y.
europepmc   +1 more source

分子间作用力构筑的具有柔性结构的醋氯芬酸多聚物: 晶体结构, 热稳定性, 溶解度和DFT计算

, 2015
孙盼盼, 刘翔宇, 孙琳, 张盛, 魏青, 尹琰, 杨奇, 陈三平   +7 more
semanticscholar   +1 more source

Parental care and bird embryonic metabolism: A comparison between uniparentally incubating Silver‐throated Tits and biparentally incubating Black‐throated Tits

Functional Ecology, EarlyView.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Studies have shown that organisms may adjust metabolic rates in response to thermal variability, highlighting metabolic plasticity as a key adaptive mechanism. Understanding the extent of metabolic plasticity of an organism is key to predicting its adaptation to climate
Qian Hu, Yue Wang, Hui Wang, Yu Wang, Xin Xia, Jiliang Xu, Jianqiang Li   +6 more
wiley   +1 more source

[Effects of 40 Hz light flicker stimulation on hippocampal-prefrontal neural activity characteristics during working memory tasks in Alzheimer's disease model rats]. [PDF]

Sheng Wu Yi Xue Gong Cheng Xue Za Zhi
Liu S, Wang L, Li S, Xu G.
europepmc   +1 more source