The Rayleigh–Lindley model: properties and applications

In this paper, the Rayleigh–Lindley (RL) distribution is introduced, obtained by compounding the Rayleigh and Lindley discrete distributions, where the compounding procedure follows an approach similar to the one previously studied by Adamidis and Loukas in some other contexts. The resulting distribution is a two-parameter model, which is competitive with other parsimonious models such as the gamma and Weibull distributions. We study some properties of this new model such as the moments and the mean residual life. The estimation was approached via EM algorithm. The behavior of these estimators was studied in finite samples through a simulation study. Finally, we report two real data illustrations in order to show the performance of the proposed model versus other common two-parameter models in the literature. The main conclusion is that the model proposed can be a valid alternative to other competing models well established in the literature.     

浅谈声乐作品《枫桥夜泊》的吐字与演唱

声乐是通过歌唱的表现形式束展现作品的艺术形象。为了使歌者能准确地演唱中国声乐作品,本文以声乐作品《枫桥夜泊》为例,针对演唱时所遇到的问题,综合分析十三辙在声乐作品中的咬字吐词的方法和规律。力争使歌者演唱作品时达到字正腔圆的艺术效果。     

转变培养模式，提高本科生培养质量

针对传统人才培养模式中存在的主要问题,提出构建高等学校复合型人才培养模式具体措施。通过采用研究型教学模式和推广学生自主管理模式,达到锻炼学生综合素质,提高本科生培养质量的目的。构建复合型人才培养模式应注意重构教育理念,确定配套考核方式和重视传统教学方式。     

中草药复方A对罗非鱼消化酶活性的影响

以奥尼罗非鱼为试验对象,探讨中药复方A饲料添加剂(主要成分的配方为山楂:麦芽:砂仁=2∶2∶1)对罗非鱼主要消化酶活性的影响。结果显示:中药复方A能极显著地提高鱼体胃和肝胰脏的淀粉酶活性(P<0.01),能显著地提高肠道淀粉酶活性(P<0.05),也能显著甚至极显著地提高胃与肝胰脏中的脂肪酶活性(P<0.05,P<0.01);但对罗非鱼的肠脂肪酶与肠胰蛋白酶的活性无显著作用(P>0.05)。由本实验看出,中草药复方A能一定程度地提高罗非鱼的主要消化酶活性。     

A Discrete Distribution Arising as a Solution of a Linear Difference Equation: Extension of the Non Central Negative Binomial Distribution

This article considers a discrete distribution that arises as the dominant solution of a linear difference equation. Basic properties and various chance mechanisms that lead to this distribution are given. In particular, its formulation as a weighted distribution and a mixed Poisson process are proposed. Parameter estimation by (a) using a combination of observed frequencies and moments and (b) maximum likelihood are examined. An example of goodness of fit is considered.     

赣语吴城方言的介词

介词的主要作用是介引,介引实词或短语组成介宾短语置于谓语中心语的前后。文章主要讨论了吴城方言的两类介词。一是与普通话字面相同,但意义用法不完全相同的介词:“跟、拿、过、随”。二是完全不同于普通话,是具有当地特色的介词:“等、得、望、捉、遮、走、儘”。     

Effectiveness of a random compound noise strategy for robust parameter design

Robust parameter design has been widely used to improve the quality of products and processes. Although a product array, in which an orthogonal array for control factors is crossed with an orthogonal array for noise factors, is commonly used for parameter design experiments, this may lead to an unacceptably large number of experimental runs. The compound noise strategy proposed by Taguchi [30 G. Taguchi, System of Experimental Design: Engineering Methods to Optimize Quality and Minimize Costs, UNIPUB/Kraus International, White Plains, New York, 1987. [Google Scholar]] can be used to reduce the number of experimental runs. In this strategy, a compound noise factor is formed based on the directionality of the effects of noise factors. However, the directionality is usually unknown in practice. Recently, Singh et al. [28 J. Singh, D.D. Frey, N. Soderborg, and R. Jugulum, Compound noise: Evaluation as a robust parameter design method, Qual. Reliab. Eng. Int. 23 (2007), 387–398. doi: 10.1002/qre.812[Crossref], [Web of Science ®] , [Google Scholar]] proposed a random compound noise strategy, in which a compound noise factor is formed by randomly selecting a setting of the levels of noise factors. The present paper evaluates the random compound noise strategy in terms of the precision of the estimators of the response mean and the response variance. In addition, the variances of the estimators in the random compound noise strategy are compared with those in the n-replication design. The random compound noise strategy is shown to have smaller variances of the estimators than the 2-replication design, especially when the control-by-noise-interactions are strong.     

Preferences for One‐Shot Resolution of Uncertainty and Allais‐Type Behavior

Experimental evidence suggests that individuals are more risk averse when they perceive risk that is gradually resolved over time. We address these findings by studying a decision maker who has recursive, nonexpected utility preferences over compound lotteries. The decision maker has preferences for one‐shot resolution of uncertainty if he always prefers any compound lottery to be resolved in a single stage. We establish an equivalence between dynamic preferences for one‐shot resolution of uncertainty and static preferences that are identified with commonly observed behavior in Allais‐type experiments. The implications of this equivalence on preferences over information systems are examined. We define the gradual resolution premium and demonstrate its magnifying effect when combined with the usual risk premium.     

Approximate tolerance intervals for the discrete Poisson–Lindley distribution

The Poisson–Lindley distribution is a compound discrete distribution that can be used as an alternative to other discrete distributions, like the negative binomial. This paper develops approximate one-sided and equal-tailed two-sided tolerance intervals for the Poisson–Lindley distribution. Practical applications of the Poisson–Lindley distribution frequently involve large samples, thus we utilize large-sample Wald confidence intervals in the construction of our tolerance intervals. A coverage study is presented to demonstrate the efficacy of the proposed tolerance intervals. The tolerance intervals are also demonstrated using two real data sets. The R code developed for our discussion is briefly highlighted and included in the tolerance package.     

BSIT组合器件

本文研制了BSIT组合器件,它是由BSIT和BJT组合而成的一种复合器件,具有开关速度高、功率容量大、h_(FE)的温度稳定性好等优点,可用于低压开关电源、优质脉冲功率源和高低温恶劣环境下的仪表等场合。