共查询到20条相似文献,搜索用时 197 毫秒
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唐易达 《制冷与空调(四川)》2008,22(1):40-42
介绍了基于网络环境下的IAQ监测与评价系统,开发了IAQ评价系统应用层协议IAQMETP的必要性,对IAQMETP协议的各个组成部分进行了详细设计,并对IAQMETP协议进行了编码,实现了IAQMETP协议的数据传输,最后对本协议进行了展望。 相似文献
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本文从变电站中变压器风冷情况进行了描述,并就目前的研究情况进行了介绍,然后结合实际,进行了变电站中变压器风冷控制系统的设计,并给出了相应的设计原理图。 相似文献
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段利君 《中国新技术新产品》2011,(9):99-100
本文对机床数控系统的构成与特点进行了分析介绍,指出了故障诊断的原则,对常见故障进行了分析,提出了故障诊断的几种方法。目的是为维修人员在维修前进行故障的诊断提供解决方法。 相似文献
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电气设备的接地技术研究 总被引:1,自引:0,他引:1
对电气设备接地概念和接地的作用进行了阐述,分析了接地系统中的流散电场分布,给出了接地电阻的简易计算方法,对低压电气装置的TN接地方式进行了分类和分析。最后对接地装置安装过程中需要注意的问题进行了总结。 相似文献
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对自行研制的冰蓄冷系统专用风机盘管进行了阐述。对送风口附近存在的结雾和滴水现象进行了分析,提出了新的冰蓄冷系统专用风机盘管的设计方案,进而针对第一种方案进行了理论分析和设计计算。对相关工作进行了初步的展望。 相似文献
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《中国新技术新产品》2015,(18)
本文对1kW调频发射机的工作原理进行了简要介绍,结合实际运用情况对发射机出现的故障进行了总结,对故障现象进行了分析,给出了一些解决措施,并对日常的检修维护提出了建议。 相似文献
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We introduce a generalization of the standard Planck distribution discussed by Johnson and Kotz (1970, Section 33.6.1). This
generalization results in a very flexible family which contains the gamma distribution as a particular case. In this paper
we provide a comprehensive treatment of the mathematical properties of the family. We derive expressions for thenth moment, moment generating function, characteristic function, mean deviation about the mean, mean deviation about the median,
Rényi entropy, Shannon entropy and the asymptotic distribution of the extreme order statistics. Estimation and simulation
issues are also considered. 相似文献
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It is proposed to use a mixture of Weibull and exponential distributions to describe component reliability on the basis of a realistic model for resource consumption. 相似文献
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Murat Tiryakioğlu 《Materials Science & Technology》2019,35(4):509-511
Statistical distributions of dendrite arm spacing have not been addressed in the literature. Two histograms for primary dendrite arm spacing in a cast nickel-based superalloy, and four histograms from a chill cast 5182 aluminium alloy ingots for secondary dendrite arm spacing have been analysed. For all datasets, lognormal distribution provided excellent fits to the data. Moreover, the Lifshitz–Slyozov–Wagner distribution was found to have systematic error in the fits to the secondary arm spacing data. 相似文献
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基于Zeta函数提出一种新的Zeta分布,将Zeta分布分为两种类型(ZetaⅠ型及ZetaⅡ型),并指出连续的ZetaⅠ型分布就是Pareto分布。最后给出一个实例予以说明。 相似文献
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Maximum likelihood Estimation of Parameters in the Inverse Gaussian Distribution,With Unknown Origin
Maximum likelihood estimation is applied to the three-parameter Inverse Gaussian distribution, which includes an unknown shifted origin parameter. It is well known that for similar distributions in which the origin is unknown, such as the lognormal, gamma, and Weibull distributions, maximum likelihood estimation can break down. In these latter cases, the likelihood function is unbounded and this leads to inconsistent estimators or estimators not asymptotically normal. It is shown that in the case of the Inverse Gaussian distribution this difticulty does not arise. The likelihood remains bounded and maximum likelihood estimation yields a consistent estimator with the usual asymptotic normality properties. A simple iterative method is suggested for the estimation procedure. Numerical examples are given in which the estimates in the Inverse Gaussian model are compared with those of the lognormal and Weibull distributions. 相似文献
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物流配送中心的规划与管理 总被引:2,自引:2,他引:0
通过介绍物流配送中心的概念、功能,分析阐述了物流配送中心的外部规划,包括选址、规模的设计,内部作业流程的规划以及信息系统的规划,确定其具体规划流程.最后基于物流配送中心基本构成要素,为物流配送中心管理提出了一些方法和措施. 相似文献
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Shafaghi A 《Journal of hazardous materials》2008,159(1):87-91
The paper presents a Bayes' method for augmenting generic equipment failure data with a prior distribution - predicated on the evidence, e.g., plant data - resulting in a posterior distribution. The depth of the evidence is significant in shaping the characteristics of the posterior distribution. In conditions of insufficient data about the prior distribution or great uncertainty in the generic data sources, we may use "constrained non-informative priors". This representation of the prior preserves the mean value of the failure rate estimate and maintains a broad uncertainty range to accommodate the site-specific event data. Although the methodology and the case study presented in this paper focus on the calculation of a time-based (i.e., failures per unit time) failure rate, based on a Poisson likelihood function and the conjugate gamma distribution, a similar method applies to the calculation of demand failure rates utilizing the binomial likelihood function and its conjugate beta distribution. 相似文献