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They have proved that if the set of keys is a Boolean algebra or a finite field, then there does not exist a two-operation homomorphic sharing scheme.
      
In this paper the decomposition formula of Walsh spectrum of boolean functions is used to construct a class of nonlinear resilient functions.
      
Boolean parallel algorithm is improved to discover frequent fuzzy attribute set, and the fuzzy association rules with at least a minimum confidence are generated on all processors.
      
Considering connections of characteristics, this paper is aimed at the construction of optimized Boolean functions.
      
The design of reflexive behavior models for situation specific choice is investigated under the assumption that the model is based on multi-valued Boolean scales.
      
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By means of the principles and methods and mathematical statistics, this article analyzes and discusses the particle characteristics of the pulverized coal and flyash. A mathematical description of the Weibull distribution is obtained. The application of such a distribution is discussed and a new method is presented to calculate the unburned carbon loss after the combustion of coal in a boiler furnace through the particle analysis of the unburned combustibles.

本文运用数理统计学的原理与方法,分析讨论了煤粉及飞灰的细度特性,得出按威布尔分布的数学描述;论述了其应用,提出一种通过未燃烬物的粒度分析,测求燃料在锅炉炉膛内燃烧后机械未燃烬损失的新方法。

From requirements of the tractor's maintenance and repair programme,themethods of investigation and research of failure rate and its data processing areapproached.On the basis of a vast amount of data,the analysis of the character-istic parameter of weibull distribution of tractor failure rate in Henan Provinceproves the superiority of the centralized repair.In the light of characters of thelife distribution,some inferences are drawn on the feasibility of planned intervalbetween repairs and the preventibility...

From requirements of the tractor's maintenance and repair programme,themethods of investigation and research of failure rate and its data processing areapproached.On the basis of a vast amount of data,the analysis of the character-istic parameter of weibull distribution of tractor failure rate in Henan Provinceproves the superiority of the centralized repair.In the light of characters of thelife distribution,some inferences are drawn on the feasibility of planned intervalbetween repairs and the preventibility of faults in the plan-preventive maintenan-ce system.in addition,the operational and maintenance level of the tractor's mo-ther substance,and its life potential are semi-guantitatively deduced in macroscope.

本文从维修系统的规划要求出发,对故障率的调查研究方法及其数据处理进行了探讨。本文在大量调查数据的基础上分析了当前河南省拖拉机故障率的威布尔分布特征参数,根据其参数,验证了集中修理的优越性。根据寿命分布的性质,从理论上就计划预防修理制的故障预防性和计划修理间距的可行性做出了推断,根据其分布线类型及其转折变化对母体的使用维修水平和寿命潜力做出了半定量的宏观推断。

Tractor is a repairable system and its time of failure-free operation forms a random pro-cess.This paper discusses Weibull random process diseribing the tractors operation charcateristic andanalyses the datum of a complete tractor reliability test with the analysis method.

拖拉机是一个可修复系统,其无故障工作时间构成了一个随机过程。本文讨论了可以描述拖拉机工作特征的威布尔随机过程,并利用其方法对一台拖拉机整机试验数据进行了可靠性分析.

 
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