马氏环境中马氏链的Poisson极限律

本文研究了马氏环境中马氏链,证明了该过程于小柱集上的回返次数是渐近地服从Poisson分布的,同时还给出了该过程是(?)-混合的一个充分条件以及过程回返于小柱集之概率的一个指数估计式.     

大气边界层的实验模拟

通过皮托管将模拟大气流动的风洞中的风速转换成气流的总静压差，再由压力传感器将其转换成电信号，输入到计算机中进行模／数转换处理，经过进一步处理，得到了风洞中风速边界层的模拟廓线．     

随机环境中的相似生灭过程族

引入了随机环境中的相似生灭过程的概念，并讨论了它们的一些性质，在此基础上构造出了与给定的随机环境中的生灭过程X^*相似的一族随机环境中的生灭过程：{X^(x),x∈[0,6]}．     

Measurement of surface profile in vibrating environment with instantaneous phase shifting interferometry

In-process measurement has been the requirement of the precision industries, but due to vibrations while manufacturing, in-process measurement has been difficult to achieve. There is little work on in-process measurement using phase shifting interferometry, as phase shifting is extremely sensitive to vibrations. In this work, the advantage of the developed non-mechanical and instantaneous phase shifting interferometry is felt while measuring surface profile of large flat surfaces under vibrating conditions which can be extended for in-process measurement of surface profile. A near common path optical configuration is achieved and the effect of the environment is reduced. Moreover, the measurement of phase is instantaneous which increases the versatility of this technique for measuring vibrating objects. Profile measurements were carried out on a smooth mirror surface excited with vibrations of different frequencies and the technique was found to be immune to vibrations of up to 1000 Hz.     

基于菲佐干涉仪测风激光雷达的误差分析

详细分析了基于菲佐(Fizeau)干涉仪测风激光雷达利用条纹重心法反演风速时的方法误差和系统噪声引起的测量误差。提出了方法误差的修正方法,推导出了测量误差理论公式。并用蒙特卡罗方法模拟了低对流层的回波信号,并对其进行条纹重心法风速反演。结果表明:方法误差和气溶胶与分子后向散射比有关,噪声引起的测量误差与信号强度和气溶胶与分子后向散射比有关。在0~5 km,高度采用条纹技术测量的风速误差小于1 m/s。     

Data structures with dynamical random transitions

We present a (non‐standard) probabilistic analysis of dynamic data structures whose sizes are considered dynamic random walks. The basic operations (insertion, deletion, positive and negative queries, batched insertion, lazy deletion, etc.) are time‐dependent random variables. This model is a (small) step toward the analysis of these structures when the distribution of the set of histories is not uniform. As an illustration, we focus on list structures (linear lists, priority queues, and dictionaries) but the technique is applicable as well to more advanced data structures. © 2005 Wiley Periodicals, Inc. Random Struct. Alg., 2006     

Asymptotic analysis of stochastic block replacement policies for multicomponent systems in a Markov environment

An asymptotic analysis of stochastic block replacement policies for a multicomponent system with fast Markov switches is provided. It is proved that this system can be approximated by a simpler system with exponential failures and averaged failure rates. The optimality of the long-run cost function is studied, as well.     

养虾废水经贝类滤食净化后池塘主要水环境因子的变化分析

2001-2002年浙江省宁海县采用封闭式内循环养殖模式养殖南美白对虾，每公顷对虾养殖产量达到12090kg，取得了显著的经济效益，为对虾的成功养殖开辟了一条有效途径．该模式在对虾养殖过程中会产生大量的养殖废水，而养殖废水主要是富营养化问题．结合养殖新模式的运行，从COD、磷酸盐、亚硝酸盐、硝酸盐、氨氮和悬浮物几项理化因子指标的变化情况，对贝类的净化能力作出分析评价，为海水围塘虾贝的综合养殖提供理论依据．     

Carbon Nanotubes,Nanocrystal Forms,and Complex Nanoparticle Aggregates in common fuel-gas combustion sources and the ambient air

Aggregated multiwall carbon nanotubes (with diameters ranging from ∼3 to 30nm) and related carbon nanocrystal forms ranging in size from 0.4 to 2 μm (average diameter) have been collected in the combustion streams for methane/air, natural gas/air, and propane gas/air flames using a thermal precipitator. Individual particle aggregates were collected on carbon/formvar-coated 3mm nickel grids and examined in a transmission electron microscope, utilizing bright-field imaging, selected-area electron diffraction analysis, and energy-dispersive X-ray spectrometry techniques. The natural gas and propane gas sources were domestic (kitchen) stoves, and similar particle aggregates collected in the outdoor air were correspondingly identified as carbon nanocrystal aggregates and sometimes more complex aggregates of silica nanocrystals intermixed with the carbon nanotubes and other carbon nanocrystals. Finally, and in light of the potential for methane-series gas burning as major sources of carbon nanocrystal aggregates in both the indoor and outdoor air, data for natural gas consumption and corresponding asthma deaths and incidence are examined with a degree of speculation regarding any significance in the correlations.     

随机环境中r维分支链的协方差计算

定义了各种条件多元概率母函数，并利用条件多元概率母函数这一强有力工具研究随机环境中r-维分支链的性质，并给出了其协方差阵的精确计算公式．