梯形布药法寻求最佳爆炸焊接药量参数的实验研究

两种力学性能相差较大的金属进行爆炸焊接实验时．其工艺参数的选择比较困难．本文以镍板与铜板的爆炸焊接实验为例．采用梯形布药法寻求爆炸焊接的最佳药量参数，获得良好的实验结果，另外研究了爆炸焊接中药量参数对结合区形状的影响．实验结果表明：本方案可简便快捷地获得最佳焊接药量参数．具有较高的实际应用价值．     

双模电磁场与V-型三能级原子相互作用的演化规律

本文利用级数展开的方法,在薛定谔表象中得到了单光子情形下的双模电磁场与三能级原子相互作用哈密顿时的演化因子.利用这一演化因子可以方便地讨论双模电磁场与V-型三能级原子相互作用的动力学问题,在此本交给出了三能级原子的粒子布居几率的演化规律.     

1.8GHz基站前端射频低噪声放大器的仿真与实现

介绍了一种1.8GHz基站前端射频低噪声放大器(LNA)的设计方法,采用Agilent公司的仿真软件ADS对其进行了仿真和优化,同时完成了实物加工和测试.测试结果表明,采用本方案设计的LNA增益约为12.5dB,噪声系数约为1.3dB,性能稳定,完全达到了通信接收机中对LNA指标的要求.     

从译事三角论"等值"与"中值"

翻译过程,其实就是更换载体的过程,将原语所含载的各类信息如实地转入目标语。理论上讲,更换载体过程的结果应该只是媒介的改变,不应是内容的增删,且这是可以做到的。但在实践中,因为原语和作者、译者和目标语等因素,译成品无法与原作品“等值”,只能退而取“中值”。     

企业集群的复杂性特征分析

分析了企业集群的概念和特征,简述了复杂性科学的基本观点,重点挖掘了企业集群中蕴涵的复杂性科学思想,指出了企业集群的复杂性特征,旨在为经济发展提供一条思路。     

基于变参数模型的中国煤炭消费与经济增长关系研究

进入21世纪以来，随着全球经济的复苏和高速发展，能源问题日益引起各国学者的重视。为了研究中国煤炭消费与经济增长的关系，本文根据1978—2005年的统计数据，建立了中国煤炭消费与经济增长的变参数模型，并对其进行了协整检验。研究发现．中国煤炭消费与经济增长之间存在一种随时间变化的长期均衡关系，模型的估计结果较好地揭示了中国煤炭消费弹性的时变规律。通过分析得出，降低煤炭消费弹性的关键在于加快产业结构调整，减少高耗煤产业的比重；发挥市场机制配置资源的基础性作用．提高煤炭利用效率。     

SEMI-MECHANISTIC MODELLING IN NONLINEAR REGRESSION: A CASE STUDY

This paper discusses the use of highly parameterized semi‐mechanistic nonlinear models with particular reference to the PARJIB crop response model of Reid (2002) [Yield response to nutrient supply across a wide range of conditions 1. Model derivation. Field Crops Research 77, 161–171]. Compared to empirical linear approaches, such models promise improved generality of application but present considerable challenges for estimation. Some success has been achieved with a fitting approach that uses a Levenberg–Marquardt algorithm starting from initial values determined by a genetic algorithm. Attention must be paid, however, to correlations between parameter estimates and an approach is described to identify these based on large simulated datasets. This work illustrates the value for the scientist in exploring the correlation structure in mechanistic or semi‐mechanistic models. Such information might be used to reappraise the structure of the model itself, especially if the experimental evidence is not strong enough to allow estimation of a parameter free of assumptions about the values of others. Thus statistical modelling and analysis can complement mechanistic studies, making more explicit what is known and what is not known about the processes being modelled and guiding further research.     

干法窑控制中的解耦方法与专家系统

介绍了干法窑的生产工艺。讨论了热工系统稳定的控制问题。提出了一种用解耦方法处理正常工况下主要参数之间的关系，以及用专家系统处理非正常工况的问题及其他干扰问题的控制策略。通过计算机仿真和现场应用试验，表明本设计方案是可行的。     

On parameter orthogonality to the mean

The existence of orthogonal parameters to the mean is characterized by a partial differential equation involving the mean, the variance and the cumulant generating function. This condition allows to explain and construct orthogonal parametrizations in several cases of interest, including higher parametric ones.     

Monitoring Variability and Analyzing Multivariate Autocorrelated Processes

Traditional multivariate quality control charts are based on independent observations. In this paper, we explain how to extend univariate residual charts to multivariate cases and how to combine the traditional statistical process control (SPC) approaches to monitor changes in process variability in a dynamic environment. We propose using Alt's (1984) W chart on vector autoregressive (VAR) residuals to monitor the variability for multivariate processes in the presence of autocorrelation. We study examples jointly using the Hotelling T² chart on VAR residuals, the W chart, and the Portmanteau test to diagnose the types of shift in process parameters.