相干态双模∑型三能级J－CM模型中辐射场的量子统计性质

用数值计算研究了相干态双模［Ｈ］型三能级Ｊａｙｎｅｓ－Ｃｕｍｍｉｎｇｓ模型（以下简称Ｊ－ＣＭ）中两辐射场的二阶关联函数的性质，揭示出每一模的光子反聚束效应和亚泊松分布的出现与时间、原子初态、初始平均光子数和失谐量的关系。     

非均质土体稳定性分析的广义极限平衡法及其应用

非均质土体稳定性分析是岩土工程中十分重要且非常复杂的课题，目前既缺乏严密的理论公式，也无统一的实用方法。本文运用拉格朗日乘子法，有机地将传统的极限平衡法与极限分析上限定理相结合，建立了一种既能考虑土料强度非线性特征，又适用于非均质剖面等的土建筑物及地基稳定性统一分析方法即广义极限平衡法，并比较严密地阐明了方法的物理基础与解答的性质。最后简要介绍了这种方法在非均质土坡稳定性、层状地基承载力与挡土墙土压力等方面应用所取得的一些数值结果与结论。     

Modelling non-normal first-order autoregressive time series

We shall first review some non-normal stationary first-order autoregressive models. The models are constructed with a given marginal distribution (logistic, hyperbolic secant, exponential, Laplace, or gamma) and the requirement that the bivariate joint distribution of the generated process must be sufficiently simple so that the parameter estimation and forecasting problems of the models can be addressed. A model-building approach that consists of model identification, estimation, diagnostic checking, and forecasting is then discussed for this class of models.     

Iron metabolism in the mononuclear phagocyte system

The maintenance of body iron homeostasis requires the coordination of multiple regulatory mechanisms of iron metabolism. The mononuclear phagocyte system （MPS, composed of monocytes, macrophages, and their precursor cells） is crucial in the maintenance of iron homeostasis. Recycling of iron is carried out by specialized macrophages via engulfment of aged erythrocytes. The iron stores of macrophages depend on the levels of recovered and exported iron. However, the molecular mechanisms underlying iron homeostasis in macrophages are poorly understood. Recent studies characterizing the function and regulation of natural resistance-associated mac- rophage protein 1 （Nrampl）, divalent metal transporter 1 （DMT1）, HLA-linked hemechromatosis gene （HFE）, ferroportin 1 （FPN1）, and hepcidin are rapidly expanding our knowledge on the molecular level of MPS iron handling. These studies are deepening our under- standing about the molecular mechanism of iron homeostasis and iron-related diseases.     

Seasonal variance in P system models for metapopulations

Metapopulations are ecological models describing the interactions and the behavior of populations living in fragmented habitats. In this paper, metapopulations are modelled by means of dynamical probabilistic P systems, where additional structural features have been defined (e.g., a weighted graph associated with the membrane structure and the reduction of maximal parallelism). In particular, we investigate the influence of stochastic and periodic resource feeding processes, owing to seasonal variance, on emergent metapopulation dynamics.     

Computing along the axon

A special form of spiking neural P systems, called axon P systems, corresponding to the activity of Ranvier nodes of neuron axon, is considered and a class of SN-like P systems where the computation is done along the axon is introduced and their language generative power is investigated.     

张峰水库一干工程地质探研

通过对张峰水库一干工程的地质勘测,对干渠的地形地貌、物理地质现象、地层岩性、水文地质、地质构造及地震和工程区地质条件进行了分析与评价。     

灰数运算的几个基本问题

提出了灰数Ｏ与灰数１的概念，证明了它们具有许多类似于通常数Ｏ和１的性质、同时引进了灰数的绝对值，并对其主要性质作了研究，得到了有关灰数的绝对值的若干不等式．     

基于GA神经网络的自适应预测控制的设计与仿真

针对自适应预测控制抗干扰、鲁棒性与实时性的矛盾，根据遗传算法优化后的神经网络具有很强的自适应性和学习能力、记忆能力、非线性映射能力、鲁棒性和容错能力，文章提出了一种新的自适应预测控制，成功地避免直接矩阵求逆，仿真表明该算法具有良好的综合性能和鲁棒性。