缺失的投资逻辑

2012年已经过去了三个季度。回顾年内行情,特别是上证指数的趋势,虽说有过一强一弱的两波升势,但其大的趋势仍是熊市格局,市场总体给人一种“扶不起来”、“易跌难涨”,并且越来越弱、熊市“回来了,而且真的就不走了”的感觉。     

化学拆分的新方法研究

主要介绍了近年来发展起来的两种化学拆分新方法,包括拆分和组合拆分;并简要论述了化学拆分中的手性识别现象,以及化学拆分方法在手性药物制备中的应用。     

考虑桥面板空间组合作用的组合空腹夹层板桥刚度研究

针对组合空腹夹层板桥的刚度计算,基于实体单元模型的参数化分析结果,提出了采用刚度放大系数来修正杆系模型结果的实用方法.推导了考虑剪切变形的简支钢空腹梁的等代抗弯刚度,并乘以刚度放大系数来分析混凝土板对结构的影响;与已有试验进行对比,验证壳-实体有限元建模方法的正确性,进一步分析了混凝土板和钢空腹梁截面参数对刚度放大系数...     

实散组合桩承载原理及应用

本文提出了实散组合桩概念,即一根桩由上下两段组成,上段是实体桩,下段是散体桩。这样就克服了散体桩通常桩头承载能力低的缺陷。本文对实散组合桩的受力概念进行了分析研究,给出了其承载力、沉降、临界桩长等计算方法和公式。最后介绍了首次工程实例。     

一种容错联邦滤波算法在INS/GPS/Doppler组合导航系统中的应用

本文提出了一种联邦滤波器的容错滤波算法,并在ＩＮＳ／ＧＰＳ／Ｄｏｐｐｌｅｒ 组合导航系统中进行了计算机仿真。仿真结果表明,该算法具有与集中卡尔曼滤波同等的导航精度,同时具有较强的容错性。     

On optimal proportional reinsurance and investment in a Markovian regime-switching economy

In this paper, the surplus of an insurance company is modeled by a Markovian regimeswitching diffusion process. The insurer decides the proportional reinsurance and investment so as to increase revenue. The regime-switching economy consists of a fixed interest security and several risky shares. The optimal proportional reinsurance and investment strategies with no short-selling constraints for maximizing an exponential utility on terminal wealth are obtained.     

Regular maps of graphs of order 4<Emphasis Type="Italic">p</Emphasis>

A 2-cell embedding f : X → S of a graph X into a closed orientable surface S can be described combinatorially by a pair M = (X;ρ ) called a map, where ρ is a product of disjoint cycle permutations each of which is the permutation of the arc set of X initiated at the same vertex following the orientation of S . It is well known that the automorphism group of M acts semi-regularly on the arc set of X and if the action is regular, then the map M and the embedding f are called regular. Let p and q be primes. Du et al. [J. Algebraic Combin., 19, 123-141 (2004)] classified the regular maps of graphs of order pq . In this paper all pairwise non-isomorphic regular maps of graphs of order 4 p are constructed explicitly and the genera of such regular maps are computed. As a result, there are twelve sporadic and six infinite families of regular maps of graphs of order 4 p ; two of the infinite families are regular maps with the complete bipartite graphs K2p,2p as underlying graphs and the other four infinite families are regular balanced Cayley maps on the groups Z4p , Z22 × Zp and D4p .     

《纯粹数学与应用数学》稿约

正1该刊是经国家科委、新闻出版署批准公开发行的数学及其应用的综合性学术刊物,主要刊登数学学科中有创造性的研究论文和具有重要经济价值的应用性论文,以繁荣数学理论,推进应用数学研究.该刊2000年荣获《CAJ-CD规范》执行优秀奖,2004年入选全国中文核心期刊,2006年获陕西省出版编辑良好奖.     

Estimates of approximation numbers and applications

In this study, the estimates of approximation numbers of embedding operators in weighted spaces have been analyzed. These estimates depend on orders of differential operators, dimensions of function spaces and weighted functions. This fact implies that the associated embedding operators belong to Schatten class of compact operators. By using these estimates, the discreetness of spectrum and completion of root elements relating to principal nonselfedjoint degenerate differential operators is obtained.     

Continuous embeddings of Besov-Morrey function spaces

We study embeddings of spaces of Besov-Morrey type, M Bp1,q1s1,r1(Rd ) → M Bp2 ,q2s2 ,r2 (R d ), and obtain necessary and sufficient conditions for this. Moreover, we can also characterise the special weighted situation Bp1 ,r1s1 (R d , w) → M Bp2 ,q2s2 ,r2 (Rd ) for a Muckenhoupt A ∞ weight w, with wα(x) = |x|α , α -d1, as a typical example.