分数次积分算子的若干新进展

Riesz位势是调和分析中的重要算子，具有齐性核或粗糙核的分数次积分，是围绕Riesz位势发展起来的一个非常活跃的课题。近年来，关于齐性核（粗糙核）分数次积分算子在各种空间上有界性的研究取得了丰富的成果。在综述分数次积分算子的发展和研究状况的同时提出了若干有待进一步研究的问题。     

多线性Marcinkiewicz算子在一类Hardy空间上的加权有界性

证明了多线性Marcinkiewicz算子在一类Hardy空间和Hardy-Block空间上的加权有界性．     

Colors restaurant

One of the few good things to come out of the World Trade Center disaster was the Restaurant Opportunities Center of New York (ROC-NY), a nonprofit organisation formed after 11 September to provide ongoing support to displaced workers and families of victims from the centre's Windows on the World restaurant. Now ROC-NY has 700 members, is working to improve conditions for restaurant workers all over the city, and is helping displaced workers from all the World Trade Center restaurants open cooperatively owned restaurants of their own. Jayne Merkel describes the first, the ambitious Colors, which has 58 owners from 24 countries, most of whom once worked at the enormous Windows on the World at the top of the famous twin towers. Copyright © 2006 John Wiley & Sons, Ltd.     

析哈代小说在传统框架内表现出的超前意识

哈代小说大致分为性格与环境小说、罗曼斯和幻想作品以及精于结构的小说;它的基本框架是传统的现实主义,而其中表现出的,正是哈代小说的巨大社会意义之所在。     

几个关于 Hardy 和与 Kloosterman 和的恒等式

利用高斯和的性质与Dirichlet L‐函数的均值定理研究了一类 Hardy和与Kloosterman和的混合均值问题。在一定条件下给出两个关于 Hardy和与Kloosterman和的混合均值的精确计算公式,所得结果揭示了一定的相消性。     

多线性Marcinkiewicz算子在一类Hardy空间上的加权有界性

证明了多线性Marcinkiewicz算子在一类Hardy空间和Hardy-Block空间上的加权有界性.     

The Persistence of the Pastoral

Architect, animator and educator Nic Clear challenges the contemporary notion of the pastoral to go beyond the simplistic binary opposites of the untainted rural idyll and the industrialised city. He explores how the narratives of the pastoral have provided a mainstay for science fiction and how this can be used to re-imagine nature itself with the aid of advanced biotechnologies to create new architectures for the 21st century.     

无界区域上一类带有权函数的半线性椭圆方程解的存在性

利用Sobolev - Hardy不等式和变分法,证明了无界区域上一类带有权函数的半线性椭圆方程解的存在性,该结果将有界区域上解的存在性及全空间上解的存在性推广到了无界的外区域上.     

Grushing型算子的广义Hardy不等式

通过选取合适的检验函数,给出了与Grushin型向量场x1,…,xd,(1 α)|x|αy1,…,(1 α)|x|αyk有关的广义带权Hardy不等式及最佳常数,改进和推广了现有文献中的结果.     

Stability of multiple fans in mine ventilation networks

In large mines, single fan is usually not enough to ventilate all the working areas. Single mine-fan approach cannot be directly applied to multiple-fan networks because the present of multiple pressures and air quantities associated with each fan in the network. Accordingly, each fan in a multiple-fan system has its own mine characteristic curve, or a subsystem curve. Under some consideration, the conventional concept of a mine characteristic curve of a single-fan system can be directly extended to that of a particular fan within a multiple-fan system. In this paper the mutual effect of the fans on each other and their effect on the stability of the ventilation network were investigated by Hardy Cross algorithm combined with a switching-parameters technique. To show the validity and reliability of this algorithm, the stability of the ventilation system of Abu-Tartur Mine (one of the largest underground mine in Egypt) has been studied.