论图案对称律形式及其构成方法

对称律是图案构成的基本形式规律之一,以对称的基本形式为出发点,从形态到空间利用对称律的构成形式和手法,根据这一构成形式规律,使对称在形态与空间两方面得到丰富的创造。     

智能烧结炉温度控制系统的设计与实现

针对烧结炉温度控制问题提出了一种简单实用的Fuzzy -PID控制方案 ,着重介绍了软件实现方法 .实际应用表明 ,此控制方案具有速度快、精确度高等特点 .     

Semiparametric Time-Varying Coefficients Regression Model for Longitudinal Data

Abstract.  In this paper, we consider a semiparametric time-varying coefficients regression model where the influences of some covariates vary non-parametrically with time while the effects of the remaining covariates follow certain parametric functions of time. The weighted least squares type estimators for the unknown parameters of the parametric coefficient functions as well as the estimators for the non-parametric coefficient functions are developed. We show that the kernel smoothing that avoids modelling of the sampling times is asymptotically more efficient than a single nearest neighbour smoothing that depends on the estimation of the sampling model. The asymptotic optimal bandwidth is also derived. A hypothesis testing procedure is proposed to test whether some covariate effects follow certain parametric forms. Simulation studies are conducted to compare the finite sample performances of the kernel neighbourhood smoothing and the single nearest neighbour smoothing and to check the empirical sizes and powers of the proposed testing procedures. An application to a data set from an AIDS clinical trial study is provided for illustration.     

压痕诱发GaAs单晶的塑性变形

利用透射电子显微镜对压痕诱发GaAs中的塑性变形结构进行了研究。结果表明,压痕周围产生了由长臂位错和短臂位错组成的非均匀分布的玫瑰型位错组态和二次对称分布的孪晶结构。利用电子衍射技术对位错类型进行了分析。结果表明位错形态与Fran-Read位错的形核、运动和相互作用有关,而孪生过程与形变过程中扩展位错的产生与运动密切相关。     

Banach空间中线性流形的单值度量投影算子部分

刘晶和王玉文于2001年引入并研究了Banach空间中线性流形的单值度量投影算子部分，但他们是在空间X和Y均自反、严格凸的强几何假定下来进行讨论的，这极不利于应用．我们在X和Y均是一般Banach空间的弱假定下，讨论并研究了Banach空间中线性流形的单值度量投影算子部分，并给出了该算子部分的结构的刻划．这为将比Lee S.J.与Nashed M.Z.所引进并研究的Hilbert空间集值线性映射包含的最小二乘解推广到Banach空间奠定了理论基础，所得的本质地推广了刘晶与王玉文的结果。     

农村公共产品供给体系中的产权明晰问题

在社会主义新农村建设中,农村公共产品的供给对于农村和农业建设至关重要。本文从明晰产权角度分析现行农村公共产品供给体系存在的问题,并给出了一些提高农村公共产品供给效率的新思路。     

略论证券犯罪的不典型一罪

在对证券犯罪的认定时,正确区分数罪和一罪具有重要意义。对证券犯罪中的连续犯、牵连犯、想象竞合犯、吸收犯等不典型一罪的复杂情况,需要进行深入探讨。     

非定值相移量的单步相移同轴数字全息

提出一种非定值相移量的单步相移同轴数字全息算法。对CCD面上的干涉光强进行了分析,用图像相减法算出CCD面上不能确定相位正负的物光波,再记录一帧有相移的干涉光强,来确定相位的正负。其特点是有相移的这一帧干涉光强没有参与物光场大小的运算,只是用于相位符号的判断。该算法对相移误差不敏感。     

A class of partially linear single‐index survival models

The authors define a class of “partially linear single‐index” survival models that are more flexible than the classical proportional hazards regression models in their treatment of covariates. The latter enter the proposed model either via a parametric linear form or a nonparametric single‐index form. It is then possible to model both linear and functional effects of covariates on the logarithm of the hazard function and if necessary, to reduce the dimensionality of multiple covariates via the single‐index component. The partially linear hazards model and the single‐index hazards model are special cases of the proposed model. The authors develop a likelihood‐based inference to estimate the model components via an iterative algorithm. They establish an asymptotic distribution theory for the proposed estimators, examine their finite‐sample behaviour through simulation, and use a set of real data to illustrate their approach.     

电梯的单片机—PLC变频控制系统

提出了使用ＭＣＳ５１单片机，ＰＬＣ可编程控制器和ＶＶＶＦ变频器组成的自动电梯的控制系统．该控制系统具有体积小，调节方便、节能和功能强等特点．分析了单片机控制系统及ＰＬＣ控制系统的硬件、软件结构、工作原理．