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排序方式: 共有187条查询结果,搜索用时 15 毫秒
181.
本文证明了与分数次积分和具有非光滑的奇异积分算子相关的Toeplitz型算子的sharp极大函数估计,做为应用,得到了该算子在Morrey空间的有界性. 相似文献
182.
183.
An efficient and simple strain gage method for determining the stress intensities of sharp-notched strips is proposed. The
bisector of the notch angle is inclined to the edge so that the mixed-mode loading is created simultaneously at the notch
tip. A theory of determining the stress intensities using strain gages is described on the basis of the two-dimensional theory
of elasticity. Experiments on specimens with various notch shapes are carried out to verify the theoretical results. Experimental
results are in good agreement with theoretical results. 相似文献
184.
研究二维空间中一类耦合非线性Klein-Gordon方程组的整体解.首先,通过构造交叉强制变分问题且建立发展流的交叉不变流形,得到了该方程组解爆破和整体存在的一个最佳条件.然后利用尺度变换讨论证明了当初值为多小时,该方程组的整体解存在. 相似文献
185.
186.
The Exact Limits and Improved Decay Estimates for All Order Derivatives of the Global Weak Solutions to a Two-Dimensional Incompressible Dissipative Quasi-Geostrophic Equation 下载免费PDF全文
Linghai Zhang 《Journal of Nonlinear Modeling and Analysis》2023,5(1):146-202
We will accomplish the exact limits for all order derivatives of the global weak solutions to a two-dimensional incompressible dissipative quasi-geostrophic equation. We will also establish the improved decay estimates with sharp rates for all order derivatives. We will consider two cases for the initial function and the external force and prove the optimal results for both cases. We will couple together existing ideas (including the Fourier transformation and its properties, Parseval''s identity, iteration technique, Lebesgue''s dominated convergence theorem, Gagliardo-Nirenberg-Sobolev interpolation inequality, squeeze theorem, Cauchy-Schwartz''s inequality, etc) existing results (the existence of global weak solutions, the existence of local smooth solution on $(T,\infty)$ and the elementary decay estimate with a sharp rate) and a few novel ideas to obtain the main results. 相似文献
187.
The Exact Limits and Improved Decay Estimates for All Order Derivatives of Global Weak Solutions of Three Incompressible Fluid Dynamics Equations 下载免费PDF全文
Linghai Zhang 《Journal of Nonlinear Modeling and Analysis》2023,5(4):803-903
First of all, the author accomplishes the exact limits for all order derivatives of the global weak solutions of the $n$-dimensional incompressible magnetohydrodynamics equations, the $n$-dimensional incompressible Navier-Stokes equations and the two-dimensional incompressible dissipative quasi-geostrophic equation. Secondly, by making use of the exact limits, he establishes the improved decay estimates with sharp rates for all order derivatives of the global weak solutions, for all sufficiently large $t$. The author proves these results by making use of existing ideas, existing results and several new, novel ideas. 相似文献