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因果性
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  causality (
     The asymptotic stability and stabilization problem is one of the fundamental problems in the theory of singular large-scale system. The study of them is much more complicated than that of state-space systems because the singular large-scale system requires considering not only stability, but also regularity and causality (for discrete singular systems) or impulse immunity (for continuous singular systems) .
     广义大系统的稳定性与镇定问题是广义大系统理论的基本问题之一,对其稳定性与镇定的研究要比状态空间系统要复杂得多,因为广义大系统不仅需要考虑稳定性,而且还要考虑正则性和因果性(离散广义系统)及脉冲自由(连续广义系统)。
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     Asymptotic stability is one of the fundamental problems in the theory of singular large-scale systems. Its determination is more complicated than that for nonsingular large-scale systems in state-space form, because for singular large-scale systems one has to consider not only stability but also regularity and impulse immunity (for continuous singular systems) and causality (for discrete singular systems).
     广义大系统的稳定性是广义大系统理论的基本问题之一,对其稳定性的研究要比状态空间大系统复杂得多,因为广义大系统不仅需要考虑稳定性,而且还要考虑正则性和因果性(离散广义系统)及脉冲自由(连续广义系统).
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  相似匹配句对
     and the relationship between cause and effect and probability.
     因果性和概率的关系。
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     A Comment on Granger Causality Test
     格兰杰因果性检验评述
短句来源
     The characteristics of the models that distinguish the traditional simulating models are of non-causal, supporting class structure (object-oriented, multi-inheritance, and template), and reuseable.
     所建模型具有无因果性,支持类结构(面向对象,多重继承,模板),可重用等特点.
短句来源
     This study deals with the dynamic relationship between liquidity and return in Chinese stock market.
     应用向量自回归(VAR)方法和格兰杰非因果性检验等计量经济方法,研究了中国股票市场流动性和收益的动态关系.
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  causality (
Solution to causality paradox upon total reflection
      
The causality paradox of total reflection of a TM wave upon an ideal nonabsorbing plasma mirror is also solved taking into consideration the negative Goos-H?nchen shift.
      
Causality of a Heat Conductivity System with Nonlinear Feedback from Boundary Conditions.
      
The norms of the operators in the sufficient condition of causality are evaluated for boundary conditions of a particular type.
      
Causality and stability conditions for the control of a linear distributed system
      
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In this paper, it is pointed out that the conception of "Synchronization" still has some undef initeness under the restriction of "Causality condition". The possible choices of the relativistic inertial space-time are thereafter considered. We set up the general formulization of SR, and give an arguments on its objective reality. Some procedure for synchronizing distant clocks and the conception of relativistic space-time are also discussed.

本文从审察“同时”概念的科学函义出发,指出了“同时”概念在因果性等条件的约束下,仍然具有不确定性;进而探讨了相对论性惯性时空的可能的选择方案,得出了狭义相对论的普遍表述形式,并从运动学及动力学的角度进行了论证。文中对于几种“异地对钟”的操作方案以及有关相对论性时空观等问题,也作了简短的讨论。

Convergence problems are often arised in analyzing discrete-time sequences with Z transform. By borrowing from combinatorial theory the concept of "ring of formal power series"——where Z is only an abstract symbol——convergence problems are evaded in dealing with "causal sequences", but the problems of"convolution quotient" and "convolution power" are only partially solved. In this paper, the "ring of formal power series" is extended to "field of formal power series", which copes with "semi-causal sequences" and...

Convergence problems are often arised in analyzing discrete-time sequences with Z transform. By borrowing from combinatorial theory the concept of "ring of formal power series"——where Z is only an abstract symbol——convergence problems are evaded in dealing with "causal sequences", but the problems of"convolution quotient" and "convolution power" are only partially solved. In this paper, the "ring of formal power series" is extended to "field of formal power series", which copes with "semi-causal sequences" and solves the problem of "convolution quotient" and "convolution power" totally within this scope.When Z is assigned the meaning of a complex variable, problem of "closed form" of formal power series emerges. By the method of asympototic expansion, a new kind of "closed form"related to the ordinarily "nowhere converging" power series is established in the paper. This new form is proved to be the generalization of Z transform and named as "generalized Z transform".By this new approach, the applicable range of Z transform is greatly extended.

在应用Z变换处理无限长离散信号序列时经常遇到收敛性的问題,使Z变換的应用范围受到一定限制。引入组合学中常见的“形式冪级数环”处理离散信号,将Z视办一个抽象符号,可以在一定程度上避免收敛性的问題,但也只限于处理“因果性”的离散信号,并且不能圆滿解决“卷积逆”和“卷积冪” 的运算问题。本文将“形式幂级数”的概念作了推广,使之可以处理“半因果性”的离散信号,在此范围内,卷积逆和卷积冪的运算都可以无障碍地进行,形成了“形式冪级数域”。 当指定Z为复数变元时,就有了形式冪级数的“变換”函数,即闭合形式的问题。本文中讨论了函数关于无穷远点的漸近展开与形式冪级数的关系,指出了很大一类在Z平面上“不收斂”的形式冪级数可以有渐近展开意义下的闭合形式,本文称之为广义Z变換,从而扩大了可用Z变换处理的离散信号之范畴。

The contents of nitrates and nitrites,or the precursors of potentially carcinogenic nitrosomines,were determined in the environm- ental samples of water and food stuffs collected from the high and low gastric cancer mortality areas in the rural villages of Dalian District, China.Similar determinations were also performed for the 167 gastric juice samples freshly taken during a local survey for gastric cancers.It was disclosed that significant difference in nitrates and nitrites contents was noticed only between...

The contents of nitrates and nitrites,or the precursors of potentially carcinogenic nitrosomines,were determined in the environm- ental samples of water and food stuffs collected from the high and low gastric cancer mortality areas in the rural villages of Dalian District, China.Similar determinations were also performed for the 167 gastric juice samples freshly taken during a local survey for gastric cancers.It was disclosed that significant difference in nitrates and nitrites contents was noticed only between the 60 cabbage samples (fresh and salted)from the two respective areas.The gastric juice pH values were found to be correlated with in vivo nitrates and nitrites contents,which were signif- icantly higher in the cases with pH value less than 3 as compared with those greater than 3.The result of this study implies that the locally produced cabbage might be the main source of nitrates and nitrites in the high gastric cancer mortality area,and that further investigation to illuminate the possible etiological role of nitrates and nitrites in the gastric cancer occurrence will be justifiable.

从选定的大连市农村的胃癌高发区及低发区,分别采取了居民饮水、食物(包括主付食品)的样本,进行了硝酸盐、亚硝酸盐含量的测定,因为它们是潜在性致癌物亚硝基胺的前体。又利用我院地方性胃癌普查工作所当时取得的167份胃液标本,进行了同样的测定。测试结果表明:在胃癌高、低发两种地区取得的饮水及食物样本中,仅仅是大白菜(鲜革及腌菜,各区60份)一项显示了显著性差别:其硝酸盐及亚硝酸盐含量高发区显著高于低发区。胃液 pH 值<3者,其硝酸盐、亚硝酸盐含量亦显著地高于其>3者。本文推断:当地出产的大白菜可能是该胃癌高发区的硝酸盐、亚硝酸盐的主要来源,值得我们进一步探究其与胃癌发生的可能因果性联系。

 
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