液固顶空气相色谱法测定西洛他唑中溶剂残留

建立液固顶空气相色谱法分析西洛他唑中溶剂残留。采用DB-FFAP大口径毛细管柱,以正丙醇为内标进行定量。乙醇、DMF的线性范围分别为 1.5￣30.2μg·mL-1　(r=0.9993),1.8￣36.4μ g·mL-1(r=　0.9968);回收率分别为104.8%,105.2%。最低检测限分别为0.01μ g·g-1,0.16μg·g-1。     

软组织线性双相理论的混合有限元解法

针对人体肌骨软组织小变形的线性双相模型,采用Galerkin加权残值法导出了求解相应线性问题的混合有限元公式,给出了相应系统方程的迭代求解格式。对软组织约束受压问题的有限元分析,得到与其理论解一致的结果。     

注塑制品残余应力的分析与计算

注塑制品已广泛应用于生活、生产等各个方面，注塑制品的残余应力是决定制品形状、表面质量、使用性能的主要因素。注塑制品的残余应力有两个来源：一个是流动残余应力。一个是热残余应力。结合熔体在注塑过程中的粘弹性变化特点。分析了注塑制品残余应力的产生原因和影响因素，给出了残余应力的计算方法。研究残余应力的产生机理对改善成型加工工艺条件、提高产品质量、降低废品率具有重要意义。     

On diagnostic checking of the autoregressive conditional intensity model

The autoregressive conditional intensity model proposed by Russell (1998) is a promising option for fitting multivariate high frequency irregularly spaced data. The authors acknowledge the validity of this model by showing the independence of its generalized residuals, a crucial assumption of the model formulation not readily recognized by researchers. The authors derive the large‐sample distribution of the autocorrelations of the generalized residual series and use it to construct a goodness‐of‐fit test for the model. Empirical results compare the performance of their test with other off‐the‐shelf tests such as the Ljung–Box test. They illustrate the use of their test with transaction records of the HSBC stock.     

Comparing and testing order relations between percentile residual life functions

We consider the problem of comparing and testing order relations between percentile residual life functions. We introduce R-R plots and processes and develop a general approach for this problem.     

MUX級联网络的組合設計

利用MUX级联网络实现多变量逻辑函数时,为求得最简的级联系统,本文提出了利用剩余函数立方图求取变量划分的快速方法。该法无需借助卡诺图,也不需要进行复杂的运算。结果表明,该法行之有效而且十分方便。     

A Test for Constant Hazard Against a Change-Point Alternative

In this article, we consider the change-point hazard rate model which arises quite commonly in mechanical or biological systems, which experience a high hazard rate early in their lifetime due to infant mortality and then a constant or steady hazard rate after the threshold time. We first derive the corresponding mean residual life function (MRLF) and observe that the MRLF is initially increasing and then constant. Here, we derive a test statistic for exponentiality against Increasing Initially then Constant Mean Residual Life (ICMRL). We also derive the asymptotic distribution of the test statistic and compare the power of the test with other existing tests such as likelihood ratio, Weibull, and Log gamma tests considered in the literature. The test performs quite well as compared to other alternatives studied.     

Computer-Generated Change-Over Designs for Correlated Observations

Change-over designs with independently distributed errors in the model have been studied extensively in the literature. Martin and Eccleston (2001 Martin , R. J. , Eccleston , J. A. ( 2001 ). Optimal and near optimal designs for dependent observations . Statist. Applic. 3 : 101 – 116 . [Google Scholar]) gave an algorithm for the generation of efficient change-over designs when the errors are correlated. This article proposes an algorithm for the generation of efficient change-over designs for estimation of direct effects of treatments in the presence of first-order residual effects in the model and when the errors are correlated.     

Reliability Properties of Systems with Two Exchangeable Log-Logistic Components

In this article, we study the reliability properties of systems under bivariate log-logistic model which comes out from a particular stress-strength analysis. For this model, we obtain basic reliability characteristics of series and parallel systems and investigate their properties. We also derive distribution and moments of cold standby system under the abovementioned exchangeable model.     

On the Nonparametric Mean Residual Life Estimator in Length-biased Sampling

In this article, we discuss nonparametric estimation of a mean residual life function from length-biased data. Precisely, we prove strong uniform consistency and weak converge of the nonparametric mean residual life estimator in length-biased setting.