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。     

光谱数据库软件系统

介绍了红外光谱及核磁共振波谱信息库系统的设计方案和技术关键.系统数据库包含纯化合物红外光谱约9万多张,高聚物红外光谱1.2万张,药品红外光谱1千张,以及核磁共振氢谱6万多张,碳谱4万多张.可以按光谱编号、化学名、商品名、原子数、分子式进行查询,还能根据未知物光谱图的谱峰形状进行检索.结果得到未知化合物的相关信息及其标准谱图.     

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.     

Prediction of the sound reduction index: a modal approach

Different methods for the calculation of the sound reduction index using modal analysis are described. The calculations use two steps: a vibratory study to determine the transverse displacement of the plate and a study of radiation. Orthotropic plates are studied in particular and the resulting calculation algorithm has been programmed. Initial hypotheses are indicated, as well as results obtained for various plates or partitions. Modal analysis calculation results are then compared to results of the Cremer-Sewell approach.     

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.     

A markov process model for software reliability analysis

Software reliability is a rapidly developing discipline. In this paper we model the fault-detecting processes by Markov processes with decreasing jump intensity. The intensity function is suggested to be a power function of the number of the remaining faults in the software. The models generalize the software reliability model suggested by Jelinski and Moranda (‘Software reliability research’, in W. Freiberger (ed.), Statistical Computer Performance Evaluation, Academic Press, New York, 1972. pp. 465–497). The main advantage of our models is that we do not use the assumption that all software faults correspond to the same failure rate. Preliminary studies suggest that a second-order power function is quite a good approximation. Statistical tests also indicate that this may be the case. Numerical results show that the estimation of the expected time to next failure is both reasonable and decreases relatively stably when the number of removed faults is increased.     

基于LoadRunner自动化应用程序接口的舰船装备软件测试系统设计与实现

针对舰船装备软件接口交互信息量大,利用现有动态测试技术对此类软件开展测试工作时效率较低,自动化测试水平亟待提高的现状,归纳分析了舰船装备软件测试系统的主要能力需求,研究了接口协议形式化、测试用例自动生成、测试用例自动驱动、通信接口转换等关键技术,并以上述技术为基础给出了舰船装备软件测试系统的体系架构设计方案,进而实现了一种基于LoadRunner自动化应用程序接口(LoadRunner Automation API)的舰船装备软件测试系统,为舰船装备软件提供了一种可行的自动化测试手段;该测试系统主要包括测试管理模块、测试用例生成模块、测试用例驱动模块和数据收集与分析模块;采用该测试系统能够有效提高舰船装备软件的测试效率。     

基于STM32的温湿度变送器设计

针对目前常见的电流型温湿度变送器恒流输出特性较差、精度较低、校准繁琐的不足,给出了一种基于STM32单片机的温湿度变送器设计方案。该电路以STM32单片机为控制核心,以SHT11数字式温湿度传感器采集环境温湿度。通过STM32的内部12位D/A输出模块将温湿度转换为模拟电压信号。随后,该电压信号通过V/I转换电路变为4～20mA的模拟电流信号。研究了常见V/I转换电路的原理并提出改进电路方案。最后,基于STM32的内部FLASH存储功能给出了一种上位机软件校准方案。通过对比仿真和实验表明,该变送器具有成本较低、恒流特性较好、精度较高、校准快捷方便的优点,能够满足工农业生产中常规温湿度测量的要求。     

A computer program for ranking analytical methods according to their fitness for purpose

A program for conducting automatic searches for analytical methods, selecting the most suitable ones according to quality requirements, and ranking them based on quality indices calculated from various pre-selected quality parameters is proposed. The program uses an externally updated database (Analytical Abstracts CD-ROMs or other) and customised quality schemes based on accuracy, precision, sensitivity, applicability to real samples, determination range (ratio), throughput and impact factor (from the Citation Index). It can, therefore, be used for a variety of purposes in analytical chemistry.     

GAVA: spectral simulation for in vivo MRS applications

An application that provides a flexible and easy to use interface to the GAMMA spectral simulation package is described that is targeted at investigations using in vivo MR spectroscopic methods. The program makes available a number of widely used spatially localized MRS pulse sequences and NMR parameters for commonly observed tissue metabolites, enabling spectra to be simulated for any pulse sequence parameter and viewed in an integrated display. The application is interfaced with a database for storage of all simulation parameters and results of the simulations. This application provides a convenient method for generating a priori spectral information used in parametric spectral analyses and for visual examination of the effects of difference pulse sequences and parameter settings.