排序方式: 共有21条查询结果,搜索用时 15 毫秒
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PVC/CPE blend modified by rigid particles has good combined properties. In this paper, the effeCts of rigid particles (PMMA. PS. CaCO,) on the rheological behavior of PVC/ CPE systems were studied. The results showed that the apparent viscosity (aha) were decreased, extrusion surface smooth and Newtonian fluidity were slightly improved by filling a little amount of rigid ploymers (PS. PMMA) to PVC/CPE blends. The fluid activition energy (E,). Newtonian fluidity. extrusion surface smooth and ba of PVC/CPE blends were increased by filling CaCO3 and die swelling ratio was decreased.The newtonian fluidity. En and ηa of PVC/CPE/CaCO3 blends can be decreased by filling rigid polymers,and good extrusion surface smooth and low die swelling ratio unchanged. 相似文献
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非线性水波Hamilton系统理论与应用研究进展 总被引:12,自引:0,他引:12
概述了辛几何理论与辛算法在Hamilton力学中的应用,综述非线性水波的Hamilton理论研究进展.阐述非线性水波Hamilton变分原理与方法的优越性与局限性,探讨KdV方程和BBM方程的Hamilton描述、对称性与守恒律,提出非线性水波Hamilton描述研究中有待进一步研究的问题和解法设想. 相似文献
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关于线性代数方程组 AX=b 反问题的再讨论 总被引:1,自引:0,他引:1
张宝善 《数学的实践与认识》1992,(1)
本文研究线性代数方程组 AX=b 的反问题,在实对称半正定(半负定)矩阵类中有解的充要条件和几个重要推论. 相似文献
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本文对“费尔马最后定理的证明”一文作出几点评注,主要结论是该证明仅仅是对费尔马最后定理的部分情形的证明,即并没有完全证明费尔马最后定理 相似文献
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本文研究确定非线性方程一致有效近似解的平均法,得到B方法(Krylov-Bogoliubov method)与KBM方法(Krylov-Bogoliubov-Mitropolski method)的改进形式,通过两个例子与多尺度方法的比较,说明改进的平均法的有效性,从而拓广了平均法的应用范围。 相似文献
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张宝善 《应用数学和力学(英文版)》1994,15(12):1177-1186
AMODIFIEDMETHODOFAVERAGINGFORSOLVINGACLASSOFNONLINEAREQUATIONSZhangBao-shan(张宝善)(DeparimentofMaih.,XuzhouTeachersCollege,Xuzh... 相似文献
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张宝善 《应用数学和力学(英文版)》1998,19(11):1115-1118
In this paper, some conmments on the proof of Fermat’s last theorem are proposed.The main resuilt is thai the proof proposed by Wong Chiahe is only part of proof for fermat’s last theorem. That is to sqy,the proof is not all-full proof to Fermat’s last theorem. 相似文献