二参数随机事件流的研究

讨论了二参数竖直平稳可加流和正则可加流的基本性质。给出了二参数正则可加流的母函数的一般形式。     

一类Markov过程不变测度的存在性及应用

本文我们讨论了一类可测Markov过程的不变概率测度的存在性,给出了一个充要条件,进一步讨论Ito过程不变概率测度的存在性.从而说明这类随机微分方程解的一些性质.     

标准非平稳高斯过程的逗留极限定理

本文讨论一般均值为0而方差为1的非平稳高斯过程在高水平之上的逗留极限定理,布朗运动作为特例被涉及.     

集值测度,随机集与集值随机过程

集值测度、随机集与集值随机过程是测度论、概率论与随机过程的进一步扩充。1964年,R.J.Aumann与K.Vind分别研究了集值映射与集值集映射。1972年Z.Artstein系统地研究了集值测度。1977年,F.Hiai等人研究了集值鞅。这就使集值映射在随机数学中得到发展。本文概括了作者近几年在这方面的研究成果。     

青岛市开发沙滩排球作为特色体育运动项目的可行性分析

沙滩排球在我国起步较晚,但在我国发展迅速,尤其是沿海城市具备开展这个项目的众多优势。本文从青岛市的地理环境、经济、政治条件、举办大赛的经验以及沙滩排球在青岛的普及推广程度几个方面,着重分析了青岛这个城市开展沙滩排球运动的优势和可行性,并提出了把＂沙滩排球＂作为青岛特色体育项目开发的设想。     

Forecasting Aggregated Moving Average Processes with an Application to the Euro Area Real Interest Rate

This paper focuses on the contemporaneous aggregation of moving average processes. It is shown that aggregating across second (or first)‐order (integrated) moving average processes leads to a macro process whose parameters are exact functions of the parameters of its generation process. Similar results are obtained at single equation level when a vector moving average framework is considered. In addition, the out‐of‐sample forecasting properties of aggregate and disaggregate procedures to forecast the aggregate variable are provided. Moreover, it is shown that the condition of equality of aggregate and disaggregate predictors is not necessary for the equality of their mean squared errors. Finally, an application to the euro area real interest rate is presented and discussed. Copyright © 2011 John Wiley & Sons, Ltd.     

Spatial distribution of the ghost crab Ocypode quadrata in low‐energy tide‐dominated sandy beaches

The spatial distribution of the ghost crab Ocypode quadrata (Crustacea, Brachyura) was described in five low‐energy tide‐dominated sandy beaches in São Sebastião Channel (Grande, Zimbro, Pitangueiras, Cabelo Gordo, and Segredo). On each beach, the zonation study was performed on five random 1?m wide transects sampled from the water line to the vegetation. In general, individuals occurred above 1?m in height in relation to mean low water (MLW) and peaked between 1.5 and 2.0?m. The sandy beaches were then divided into three 1?m wide strips (tidal levels) parallel to the water line and equivalent to medium intertidal, upper intertidal, and subterrestrial fringe to test the effect of beach and tidal level on the abundance and size of O. quadrata. These strips were sampled as a whole using adjacent 1 m² squares. A previous evaluation showed a positive significant relationship between carapace length and burrow diameter, thus supporting crab size estimates from burrow openings. The smallest individuals occurred mainly in the medium intertidal, but were also recorded in the subterrestrial fringe, which was occupied mainly by large‐sized individuals. In general, the individuals were randomly dispersed within the strips and concentrated in the upper intertidal zone on all the sandy beaches. The density of O. quadrata varied among beaches, with a tendency to lower values on areas with very fine and poorly or moderately sorted sediments and on that most used for recreational activities (Grande). Burrow size also varied among beaches, with a tendency of smaller burrows in areas with coarser sand grains and higher tourism. These results indicate that the effect of human impact on density and size of O. quadrata may be confounded by the high environmental heterogeneity of the studied system, which may make it difficult to utilize this species as an indicator of the conservation status of low‐energy tide‐dominated sandy beaches.     

随机谐振系统的小波性质

研究了随机谐振过程在小波变换下的相关性，稠度等性质．     

多指标线性时序过程的小波特征

分析了多指标时序过程的小波变换，得到了变换下的性质及展式。     

一辆面包车追尾引起的思索

我国已经进入汽车时代，但是，人们对汽车保险知识了解甚微，更不了解各个险种所保责任。本文通过一期交通事故，分析了汽车保险险种、保险责任，交通事故处理到理赔的程序，最后，提出了几点具有实际意义的建议。