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161.
The problem of constructing functions f1, f2 analytic in the unit disc D of the complex plane satisfying
162.
Pekka J. Nieminen 《Journal of Mathematical Analysis and Applications》2011,382(2):565-576
We derive exact formulas for the essential and weak essential norms of weighted analytic composition operators acting on certain function spaces in the unit disc, extending and improving earlier results due to Sarason and to Kriete and Moorhouse. Differences of composition operators are also considered. The formulas involve the Aleksandrov measures associated to the symbol of the operator. The results are based on a variant of a general method due to Weis of constructing best compact and weakly compact approximants for linear operators on L1 spaces. 相似文献
163.
Zhenbin Fan Jin Liang Ti-Jun Xiao 《Nonlinear Analysis: Theory, Methods & Applications》2011,74(8):2853-2861
We prove new composition theorems for Stepanov-like almost automorphic and Stepanov-like pseudo-almost automorphic functions. An application is given to a class of evolution equations with Stepanov-like pseudo-almost automorphic perturbations. 相似文献
164.
Wenyu Chen Rongdong YuJianmin Zheng Yiyu Cai Chikit Au 《Journal of Computational and Applied Mathematics》2011,235(17):5001-5016
This paper considers the problem of computing the Bézier representation for a triangular sub-patch on a triangular Bézier surface. The triangular sub-patch is defined as a composition of the triangular surface and a domain surface that is also a triangular Bézier patch. Based on de Casteljau recursions and shifting operators, previous methods express the control points of the triangular sub-patch as linear combinations of the construction points that are constructed from the control points of the triangular Bézier surface. The construction points contain too many redundancies. This paper derives a simple explicit formula that computes the composite triangular sub-patch in terms of the blossoming points that correspond to distinct construction points and then an efficient algorithm is presented to calculate the control points of the sub-patch. 相似文献
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166.
高效液相色谱法测定烟火药剂中的苦味酸 总被引:1,自引:0,他引:1
建立了烟火药剂中苦味酸的高效液相色谱检测方法。采用Zorbax Eclipse XDB-C18色谱柱(4.6mm×250mm,5μm)分离,V(甲醇)∶V(0.1%冰醋酸水溶液)=55∶45,等梯度洗脱,流速0.8mL/min;测定温度为40℃;采用紫外检测器检测,检测波长为350nm。苦味酸的质量浓度在0.5—20mg/L时与色谱峰面积之间线性关系良好(r=0.9998);加标回收率为85.6%—92.4%,相对标准偏差(RSD)为2.1%—6.5%。该方法简便快速,结果准确,重现性好,可作为检测烟火药剂中苦味酸的一个有效方法。 相似文献
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169.
Three aspects of block copolymer dynamics are reviewed with emphasis on the influence of the proximity to the disorder-to-order transition. The relaxation of composition fluctuations in disordered diblocks is discussed over the whole range of wavevectors. The translational motion of individual copolymer chains is reviewed both with respect to the effects of ordering on the long-time diffusional motion and on the motion for short time- and length-scales. Finally, the behavior of the block orientational relaxation is briefly summarized. 相似文献
170.
Let A be a domestic canonical algebra over a finite field. In this article, we prove that the composition algebra C(A) of A has a triangular decomposition 𝒫·𝒯·? corresponding to the division of the indecomposable modules into the preprojectives, the regulars, and the preinjectives. 相似文献