Results 11 to 20 of about 990,559 (74)
Journal of Ecology, Volume 107, Issue 6, Page 2697-2712, November 2019., 2019 We integrated multiple components of plant and herbivore diversity to unravel the linkages that drive biodiversity relationships and determine the consequences of biodiversity loss across trophic levels. Our study suggests that lepidopteran phylogenetic diversity is significantly affected by plant species loss when basic splits in the evolutionary ...
Ming‐Qiang Wang +18 more
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Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT A comparative study was performed to elucidate the temperature‐dependent corrosion kinetics and the semiconductor/structural characteristics of the passive film formed on Fe40Ni7Cr17Mo12C13B9Y2 (at%) amorphous alloy coatings. The results indicate that increasing temperature accelerates the corrosion kinetics of the coating.
Yang Lv +12 more
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Geophysical Research Letters, Volume 52, Issue 10, 28 May 2025.Abstract Enhanced Antarctic ice sheet mass loss yields ocean surface freshening, cooling and sea ice expansion, which result in changes in the atmospheric conditions. Using the Southern Ocean Freshwater Input from Antarctica (SOFIA) multi‐model ensemble, we study the atmospheric response to a 100‐year idealized freshwater release of 0.1 Sv.
Xiaoqi Xu +14 more
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四川大学学报. 自然科学版, 2004 给出了变系数Helmholtz方程的六阶高精度校正法.此校正过程几乎不增加工作量,而校正后精度比未校正提高了四阶,并能提供后验误差估计.同时,对于常系数Helmholtz方程,给出了八阶校正格式.
王前东, 程攀, 吕涛
doaj
偶数维空间上广义Beltrami方程组及高维空间的Beltrami方程组 [PDF]
, 1997 本文在ｎ＝２ｌ维偶数空间上得到广义Ｂｅｌｔｒａｍｉ方程组Ｄｔｆ（ｘ）Ｈ（ｘ）Ｄｆ（ｘ）＝Ｊ（ｘ，ｆ）２／ｎＧ（ｘ）的伸张公式，并在Ｈ（ｘ）为对角阵的条件下，给出广义Ｂｅｌｔｒａｍｉ方程组的正则性定理，Ｃａｃｉｏｐｏｌｉ型不等式和可去性定理．此外，还将所有维数的Ｂｅｌｔｒａｍｉ方程组Ｄｔｆ（ｘ）Ｄｆ（ｘ）＝Ｊ（ｘ，ｆ）２／ｎＧ（ｘ）化为一个 ...
程金发, 方爱农
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Evolusion and Gender Bias Reflected in Chinese Characters [PDF]
, 2013 Evolution of Chinese characters besides the form of its streaks, also occur in change and meaning of vocabulary. Vocabulary containing radical women which is expressed with the pictograph #22899 n#474 contained a lot of negative meanings, so it is very ...
Karsono, Ong Mia Farao
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四川大学学报. 自然科学版, 2015 在线性近似下,Helmholtz方程能够描述小尺度大气声波波动.因此分析小规模大气声波波动特性,必须对Helmholtz方程进行求解.大多数求解Helmholtz方程的方法是在某些边界条件和初始条件下进行的,而边界条件和初始条件本身就是在假设、近似的基础上得到的,且会使得计算过程复杂和计算量变大.指数函数法具有多个自由参数是求解非线性问题精确解的一种十分有效、直接的工具,且在求解时不要考虑边界条件和初始条件,对函数进行指数和双曲正切变换的共同作用可近似为线性变换.基于上述思想 ...
纪娟娟, 郭业才, 张兰芳
doaj
Zhejiang Daxue xuebao. Lixue banThe Helmholtz equation has important applications in many fields such as acoustics and electromagnetics. However, its high wave number and strong oscillation characteristics lead to systematic difficulties in numerical simulations.
陈璐(CHEN Lu) +3 more
doaj +1 more source
, 1990 湍流研究具有重要的理论和工程意义,谱方法能达到快速收敛、高效和边界层中高分辨率、高精度。用谱方法边界条件处理也方便,谱方法随着数值方法的改善和计算机系统的发展,它在湍流数值模拟中的作用愈加重要。 这里介绍了一平直槽道及两个同心圆柱间的三维N-S方程数值求解的谱方法,在平直槽道中在平行壁面的x及z方向上用富氏展开,在法向(y)用契比雪夫多项式展开,与平直槽道相似,在θ和z方向用富氏展开,在法向r用契比雪夫多项式展开,为解N-S方程,在时间方向用Crank-Nicholson格式,非线性项用Adam ...
廖柏程, 苏铭德
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Auto-focus technology and its application based on image processing
, 2009 Auto-focusing technique is an important method to improve the precision,intelligentization,automatization for the indentation diameter measurement.The paper introduces an auto-focus method of indentation diameter measurement based on image processing ...
Chen, Xiaomei, Yang, Tao, Zuo, Yong
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