Four Kinds of Microwave Measurements to Make Use of an Automatic Slotted-Line System

An automatic slotted line system controlled with the micro-computer IBM 80486 which we have developed had been reported. In this paper, the measuring principles and the software designs of impedance, attenuation, phase shift and detection law of diode measurement to make use of this system will be described, some typical measurement results will be given. This method is adaptable for MM-Wave band and other Micro-wave band.     

A composite (stacked) picture generation technique for spectral profile representation of dye laser

In this paper, a new technique for data representation format from video recording of spectral profile of tunable dye laser has been formulated. Only a part of the acquired images acquired sequentially in programmed time interval, was used to make the composite picture to measure variation of the parameters. A CCD camera based imaging system was used to confine the spectral pattern. No additional hardware other than image capturing device was used. The technique developed reduces the storage space required in the computer and also enhances the measurement speed significantly. The software algorithm developed has been used effectively to measure various parameters of tunable dye lasers and other optical sources.     

基于对称3×3耦合器的光纤干涉信号的软件解调技术

从基于对称3×3耦合器的光纤干涉信号中解调出被测物理量,需要经复杂的运算.本文提出用软件来模拟实现了信号的解调,省去了繁杂的模拟运算电路,并且通过软件解调运算,可得到运算中间各过程的波形图,也可以分析出各种误差和产生误差的原因,对硬件解调电路的设计有指导性意义.     

自编数据处理程序与PW1404型X荧光光谱仪的接口软件LLLZ的研究与应用(Ⅱ)

本文将ＬＬＬＺ软件应用于粉末状地质化探样品的分析中，应用结果表明，ＬＬＬＺ软件对原有数据的应用直接、快速，分析方法的选择快速，具有易于开发，使用方便的特点。     

Stackelberg strategy solution for optimal software release policies

We present a software release policy which is based on the Stackelberg strategy solution concept. The model formulated assumes the existence of two type of producers in the market, the leader and follower. The resulting release policy combines both cost factors and a loss of opportunity factor which is the result of competition between the rival producers. We define a Stackelberg strategy pair in the context of our model and, through a series of preliminary results, show that an optimal strategy pair exists. We also present a numerical example which utilizes a software reliability growth model based on the nonhomogeneous Poisson process. Finally, we explore the relative leadership property of the optimal strategies.This work was supported in part by a FOAS Research Grant provided by RMIT. The author would like to thank the referees for constructive suggestions which helped to improve a previous version of this paper.     

真空热试验通用软件平台工作模式与关键技术

为了改善试验测控软件在通用化、模块化设计、控制算法、试验过程信息化管理等方面的诸多不足,研制航天器热试验通用软件平台。该平台融合了计算机技术、虚拟仪器技术和网络技术,不仅实现从试验准备、试验工况运行、试验数据显示到实验结果分析等工作的自动化,而且应用多项关键技术使该平台成为一个有机整体并具备广泛的通用性、灵活的配置能力、便捷的人机接口。文中重点介绍了该平台的4中工作模式,分别为单机模式、分布式模式、云计算模式、集中控制模式。通过工作模式的介绍说明该平台如何在各种规模真空热试验设备上应用。热试验通用软件平台能够提高热试验的自动化程度、提高热试验的可靠性、有利于热试验技术经验的积累。     

波长色散X射线荧光仪器进展

本文叙述了自１９９０年以来波长色散Ｘ射线荧光光谱仪及分析技术的最新进展，介绍分为波长色散Ｘ射线荧光分析仪的整机特点，设计思想的发展，新技术应用，计算机及软件发展和定性定量分析等部分。     

激光自外差相干测量中分布反馈半导体激光器电流调谐非线性的补偿方法

半导体激光器的电流调谐非线性对自外差相干测量的精度影响很大.研究了分布反馈半导体(DFB) 激光器的电流调谐特性,据此提出一种数学模型补偿方法.利用已知光程差下的差拍频率,建立了动态调频 系数的数学模型.以此模型对DFB激光器的电流调谐非线性进行补偿,可以将差拍信号频率预测值的相对误差 减小约3%,提高了系统的测量精度.数学模型补偿方法简化了测量系统的结构,适用于高精度的电流调谐 激光在线测量系统.     

SPINEVOLUTION: a powerful tool for the simulation of solid and liquid state NMR experiments

Exact numerical simulations of NMR experiments are often required for the development of new techniques and for the extraction of structural and dynamic information from the spectra. Simulations of solid-state magic angle spinning (MAS) experiments can be particularly demanding both computationally and in terms of the programming required to carry them out, even if special simulation software is used. We recently developed a number of approaches that dramatically improve the efficiency and allow a high degree of automation of these computations. In the present paper, we describe SPINEVOLUTION, a highly optimized computer program that implements the new methodology. The algorithms used in the program will be described separately. Although particularly efficient for the simulation of experiments with complex pulse sequences and multi-spin systems in solids, SPINEVOLUTION is a versatile and easy to use tool for the simulation and optimization of virtually any NMR experiment. The performance of SPINEVOLUTION was compared with that of another recently developed NMR simulation package, SIMPSON. Benchmarked on a series of examples, SPINEVOLUTION was consistently found to be orders of magnitude faster. At the time of publication, the program is available gratis for non-commercial use.     

Modelling and analysis of a software system with improvements in the testing phase

In this paper, we consider the error detection phenomena in the testing phase when modifications or improvements can be made to the software in the testing phase. The occurrence of improvements is described by a homogeneous Poisson process with intensity rate denoted by λ. The error detection phenomena is assumed to follow a nonhomogeneous Poisson process (NHPP) with the mean value function being denoted by m(t). Two models are presented and in one of the models, we have discussed an optimal release policy for the software taking into account the occurrences of errors and improvements. Finally, we discuss the possibility of an improvement removing k errors with probability p_k, k ≥ 0 in the software and develop a NHPP model for the error detection phenomena in this situation.