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21.
A numerical method that can treat a contact discontinuity as a sharp discontinuity is proposed by introducing a density function. The surface of the density function representing the discontinuity can be described with alomost one grid on an Eulerian formulation throughout the calculation even if the surface distortion is large. The algorithm is based on the CIP (cubic-interpolated propagation) method combined with variable transformation. Smearings of the discontinuity are overcome without using any special treatment to the surface. Dependent variables on both sides of the surface are computed in a normal procedure. The present scheme is applied both to a compressible flow and quasi-incompressible flow accompanying shock discontinuities. The result exhibits advantages of this method in robustness and efficiency.This article was processed using Springer-Verlag TEX Shock Waves macro package 1.0 and the AMS fonts, developed by the American Mathematical Society. 相似文献
22.
Global Convergence Properties of Nonlinear Conjugate Gradient Methods with Modified Secant Condition 总被引:2,自引:1,他引:1
Conjugate gradient methods are appealing for large scale nonlinear optimization problems. Recently, expecting the fast convergence of the methods, Dai and Liao (2001) used secant condition of quasi-Newton methods. In this paper, we make use of modified secant condition given by Zhang et al. (1999) and Zhang and Xu (2001) and propose a new conjugate gradient method following to Dai and Liao (2001). It is new features that this method takes both available gradient and function value information and achieves a high-order accuracy in approximating the second-order curvature of the objective function. The method is shown to be globally convergent under some assumptions. Numerical results are reported. 相似文献
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Stepwise, selective DIBAL reduction of the acetonide diester derived from tartaric acid followed by the Horner-Emmons reaction effectively provided desymmetrized hydroxy mono-olefination products in a one-pot operation. 相似文献
25.
Shinnosuke Okawa 《Advances in Mathematics》2011,(5):2869
We show that the bounded derived category of coherent sheaves on a smooth projective curve except the projective line admits no non-trivial semi-orthogonal decompositions. 相似文献
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H. Fuchigami Y. Nakao S. Tanimura Y. Uehara T. Kurata S. Tsunoda H. Niino A. Yabe 《Applied Physics A: Materials Science & Processing》1998,67(3):277-282
Received: 12 March 1998/Accepted: 15 March 1998 相似文献
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K Torizumi S Okamoto M Yasui Y Okamoto T Tuda K Ota F Oka H Sagawa K Yabe A Okuyama 《Radioisotopes》1988,37(11):623-626
The bone metabolic markers showed the significant differences in age and sex of the hemodialysis patients with renal insufficiency. It is likely that the evaluations of bone change and biochemical metabolic markers should be based on serum estradiol level, sex and age of the renal hemodialysis patients. 相似文献
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