不连续变量

The experiments of neuronal pacemaker show typical bifurcations from period 1 to period 5 with stochastic bursting patterns. A discontinuous map of the slow variable in Chay model which captures the essential characters of the period-adding bifurcation scenario is constructed in this thesis.

在神经起步点实验中展示了伴有随机簇放电的从周期1到周期5的典型分岔，本文在把握加周期分岔的根本特征的基础上构造了Chay模型中慢变量的不连续映射。

Due to the rapid development of computer science and its extensively application in modern society, some scholars found a new type of dynamic systems named as discrete event systems , which is different from continuous variable dynamic systems.

现代计算机科学的迅猛发展及其在现代社会中广泛的应用，催生了一类不同于连续变量动态系统的新系统，学者们将之命名为离散事件系统。

The identity and difference in the expressional patterns between distribution functions of discrete random variables and distribution functions of continuous random variables are elaborated,and the main expressional patterns of distribution functions of continuous random variables are summarized,and the derivability of distribution functions of continuous random variables is discussed.

0引言在概率论中，连续型随机变量分布函数的表达形式及其可导性是一难点。其一，离散型随机变量的分布函数有较明显的性质和统一的表达形式，而连续型随机变量，由于其概率密度函数一般为分段函数，根据其分段区间的差异，表达形式差异较大，不容易总结其规律，本文主要比较连续型随机

In a'variable structure system', the control law is a discontinuous function of the state variables when the trajectory crosses a prescribed hypersurface in the state space.

在一个变结构系统中，控制律是当状态轨迹经过规定的超平面时状态变量的不连续函数。

It is a general framework algorithm, which has fast convergence performance and is easy to implement. PSO can be conveniently applied to solve complicated nonlinear, noncontinuous, multi-dimensioned optimization problem with discrete variables and multiple restrictions.

它收敛速度快、计算简单、通用性强，能方便地被用于求解带离散变量的非线性、不连续、多约束、多变量的复杂优化问题中。

Optimal algorithm of combined nonlinear Hopfield network appears powerful validity in solving nonlinear planning, which includes nonlinear objective function, linear constrains and high-demension of decision-making variants, for its ability of nonlinear parallel computation. It is prominent among optimal algorithms because of its function of simply implement with electrocircuit hardware. Genetic algorithm is expressly suitable for optimal calculation regarding the planning of massive, highly nonlinear, inconsecutively differentiable and multiobjective function as well as objective function without analytical expression. However, it inclines to prematurity, as well as its limitation in ability of partial optimal search. Introducing the optimal algorithm of niche genetic simulated annealing to standard Genetic algorithm, can therefore improve the full-scale or partial search ability of Genetic algorithm effectively. It has a far-flung perspective in the field of systemic planning of water pollution control.

组合式非线性Hopfield网络优化算法所具有的非线性大规模并行计算能力在求解具有非线性目标函数、线性约束条件及高维决策变量的非线性规划问题方面显示出了强大的生命力，它易于电路硬件实现的功能更是在优化算法中独树一帜；遗传算法采用概率搜索技术，不受目标函数与约束条件的限制，特别适合大规模、高度非线性的不连续可微的多峰目标函数及无解析表达式的目标函数的规划问题的优化计算，但其存在容易早熟、局部寻优能力较差等缺点，本文在标准遗传算法中引入小生境技术及模拟退火算法有效地改善遗传算法的全局和局部搜索性能，提高了全局最优解的寻优质量，小生境遗传退火模拟优化算法在水污染控制系统规划中的应用前景极为广阔。

Indicator principal component microfacies simulation is a technique for describing lithofacies or microfacies distribution using sequential indicator simulation method based on selection of principal components with discontinuous variables.

1·大庆油田有限责任公司勘探开发研究院黑龙江大庆 163712； 2·北京大学地质系北京 100871； 3·西安石油学院计算机系陕西西安 710065摘要指示主成分模拟是在提取不连续变量主成分的基础上，采用序贯指示方法模拟岩相、沉积微相的分布。

In the first part of this thesis, we discussed the strong singularity phenomena in structural topology optimization.

本论文首先讨论了当拓扑设计变量取其临界值时，问题的优化模型和计算模型会同时发生的不连续变化的强奇异问题。

An improved algorithm for shot segmentation and key frame extraction based on clustering is proposed, a referenced variable is used in unsupervised clustering to resolve the frame sequence's incontinuity or false segmentation problems which can be caused probably by unsupervised clustering.

提出了一种改进的基于聚类的镜头分割和关键帧提取算法，在无监督聚类中引入一个参考变量，解决了利用无监督聚类进行镜头分割和关键帧提取时可能产生的帧序不连续或分割错误的问题。

Results suggest that there are the direct effect and indirect effect between DIO and TVP,with the firm capability as an intermediating factor.

发现科技创业企业绩效受到不连续创新导向的直接影响和间接影响，企业能力是其间接影响的中介变量，不确定性对不连续创新导向与企业能力、企业能力与创业绩效之间的作用关系存在正向调节效应。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。