用于超弹性分析的高效杂交应变--EAS固体壳单元的研究

提出了一个用于橡胶材料分析的弱变分方程，基于一个可压缩Neo—Hookean模型，将EAS模式和杂交元法有机地结合起来，推导了一个高效、稳定的杂交应变——EAS固体壳单元，通过巧妙地选择应交插值函数和本文中提出的一个精化措施，克服了橡胶材料所表现出的大应变超弹性本构为杂交元正交化法的实施所带来的困难，保证了整个单元列式都仅采用低阶高斯积分，显著提高了计算效率，确保橡胶材料不可压缩性计算的顺利进行，并克服了固体壳元的厚度自锁问题。     

Search for isovector giant monopole resonances via the Pb(3He,tp) reaction

The (nat)Pb(3He,tp) reaction at E(3He) = 177 MeV was studied to identify 2Planck's over 2piomega isovector monopole strength in Bi isotopes. Monopole strength was found in the region -45相似文献   

On the Bifurcations and Multiple Endemic States of a Single Strain HIV Model Dedicated to Professor Toshikazu Sunada on the Occasion of his 60th Birthday

The dynamics of a single strain HIV model is studied.The basic reproduction number R_0 used as a bifurcation parameter shows that the system undergoes transcritical and saddle-node bifurcations.The usual threshold unit value of R_0 does not completely determine the eradication of the disease in an HIV infected person.In particular,a sub-threshold value R_C is established which determines the system's number of endemic states:multiple if R_c Ro 1,only one if R_C = R_0 = 1,and none if R_0 R_C 1.