排序方式: 共有30条查询结果,搜索用时 31 毫秒
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单纯形上Sikkema算子及其逼近定理 总被引:2,自引:0,他引:2
吴雁 《烟台大学学报(自然科学与工程版)》2001,14(1):15-18
构造单纯形T={(x,y):r,Y≥0,.r y=≤1}上的Sikkema算子,并且讨论它的逼近性质。得到了类似一元Sikkema算子的一些性质. 相似文献
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关于平均非扩张映射的公共不动点问题 总被引:1,自引:0,他引:1
X表示Banach空间,K是X中的非空有界闭凸子集且具有正规结构。已知平均非扩张映射T:K→K,满足‖Tx-Ty‖≤a‖x-y‖ b‖x-Ty‖,Vx,y∈K,a,b≥0,a b≤1在K中存在唯一的不动点.本文给出若T1和T2都是如上所定义的平均非扩张映射。且满足T1T2=T2T1,则T1T2在K中存在唯一的不动点。并且T1和T2在K中存在唯一的公共不动点. 相似文献
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K阶Sikkema-Kantorovitch算子Lp逼近的正逆定理 总被引:1,自引:0,他引:1
吴雁 《烟台大学学报(自然科学与工程版)》2002,15(4):235-240
利用Dirtizan-Torik光滑模讨论了Sikkerma-Kantorovitch算子的逼近问题,给出了它的强型正定理和弱型逆定理,在逆定理中取消了对αn的限制,从而很容易得到其逼近的特征刻化。 相似文献
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Sikkema—Kantorovitch算子的L^p逼近 总被引:1,自引:0,他引:1
吴雁 《烟台大学学报(自然科学与工程版)》1998,11(3):157-162
研究Sikkema-Kantorovitch算子在L^p空间的逼近问题,给出了它的强型正定理和弱型逆定理,从而得到其逼近的特征刻划。 相似文献
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一台穆斯堡尔极化谱仪是由γ射线源(极化器)、传送器(被测样品)、分析器和自动计数系统所组成。我们利用该极化仪装置已经观察到铁氧体Fe_3O_4的穆斯堡尔法拉第效应。 相似文献
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The performances of fme-crystalline zirconia ceramics in workpiece ultrasonic vibration grinding (WUVG) and conventional grinding (CG) with diamond wheel were researched. The effects of WUVG and CG on material removal rate, grinding forces, surface roughness and microstructure of zirconia ceramic were investigated. Experimental results indicated that: (1) The material removal rate (MRR) in ultrasonic grinding process is two times as large as that of in conventional grinding. The material removal rate increases with increasing grinding depth in both ultrasonic grinding and conventional grinding. (2) The ultrasonic vibration grinding force is lower than that of conventional grinding force, and the increase of the worktable speed leads to a decrease of the grinding force, while the grinding force increases with larger grinding depth in both WUVG and CG. (3) The surface of ultrasonic vibration grinding has no spur and build-up edge and its surface roughness is smaller than that of CG significantly. Surface quality of WUVG is superior to that of conventional grinding, it is easy for ultrasonic vibration grinding that material removal mechanism is ductile grinding. 相似文献
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在单纯形上定义多元Sikkema-Kantorovitch算子kn(f),利用Ditizan-Totik光滑模讨论该算子的逼近问题,给出其强型正定理,估计出它在空间Lp的收敛速度并给予证明.文中的结果可以推广到K(K>2)维单纯形上. 相似文献