渐开线齿形的测量推算

介绍了一种机械制造行业中常用的快速、经济、准确的渐开线齿形测量及推算的方法。     

紧密排列燃料组件交混系数试验研究

单相及两相工况下的交混系数是燃料组件热工分析、特别是子通道分析的一个关键参数。本文介绍19根棒束绕丝结构紧密排列燃料组件交混系数单相试验的试验本体结构、试验内容、试验方法及试验结果。试验研究获得了燃料组件出口温度分布及紧密排列燃料组件交混系数,最后对试验结果、交混系数值以及热工参数对交混系数的影响等进行分析。     

基于分数阶傅里叶变换的双基地雷达线性调频信号的参数联合估计新方法

该文提出一种双基地MIMO雷达线性调频(LFM)信号参数的联合估计新方法。在所提出的新的双基地MIMO雷达的信号模型基础上,利用分数阶傅里叶变换对线性调频(LFM)信号的能量聚集特性进行提取,根据分数阶傅里叶变换域内的峰值点对多普勒频移尺度和时延进行估计,并采用FRFT-MUSIC算法实现了线性调频(LFM)信号收发角的联合估计,实现了收发角的自动配对。仿真实验验证了算法的有效性。     

Assessment methodology for confidence in safety margin for large break loss of coolant accident sequences

Deterministic Safety Analysis and Probabilistic Safety Assessment (PSA) analyses are used to assess the Nuclear Power Plant (NPP) safety. The conventional deterministic analysis is conservative. The best estimate plus uncertainty analysis (BEPU) is increasingly being used for deterministic calculation in NPPs. The PSA methodology integrates information about the postulated accident, plant design, operating practices, component reliability and human behavior. The deterministic and probabilistic methodologies are combined by analyzing the accident sequences within design basis in the event trees of a postulated initiating event (PIE) by BEPU. The peak clad temperature (PCT) distribution provides an insight into the confidence in safety margin for an initiating event.     

Estimation method for parameters of overlapping nuclear pulse signal

Identification of nuclear pulse signal is of importance in radioactive measurements,especially in recognizing adjacent overlapping nuclear pulses.In this article,we propose an estimation method for parameters of typical overlapping nuclear pulse signals.First,the nuclear pulses are regarded as individual genes and the norm is set as the fitness function.Second,the global optimal solution is found by searching the population of genetic algorithm,so as to estimate the parameters of nuclear pulse.With high precision,this method can identify parameters of overlapping nuclear pulses in the Sallen-Key Gaussian signal decomposition experiments.This pulse recognition method is of great significance to improve the precision of radioactive measurement and is suitable for serious overlap of nuclear pluses.     

食品真空贮藏温度变化的试验研究与分析

对食品在不同贮藏条件下的温度变化进行试验研究并与理论模拟进行对比分析。通过试验验证，试验结果能与数值模拟结果较好的吻合；在试验的基础上对某些参数进行对比，得出在不同贮藏条件下参数的变化情况以及应采取相应的措施，为食品冷冻冷藏工程的实践提供理论依据。     

Defining flashover for fire hazard calculations

As the use of performance-based methods for evaluating the fire behavior of materials and systems becomes more widespread, objective criteria to judge fire behavior become more important. This paper reviews techniques for predicting the most common of these criteria, the onset of flashover. The experimental basis for working definitions of flashover is reviewed. Comparisons of available calculational procedures ranging from simple correlations to computer-based fire models that can be used to estimate flashover are presented. Although the techniques range in complexity and results, the various predictions give estimates commensurate with the precision of available experimental data.     

一类非最小相位对象解耦控制的非对消设计

本文分析了将基于零、极对消原则的前馈解耦设计方法应用于含有S右半平面零点的一类非最小相位对象时所存在的问题，提出了非对消解耦设计方法应用于该类对象的原理、特点及步骤，结合实例给出了仿真结果，所得结论对实际系统具有一定的指导意义。     

化工设备标准椭圆封头简便作图法与最佳参数选择

化工设备标准椭圆封头简便作图法与最佳参数选择陆博福（黑龙江黑化集团有限公司压力容器厂）宋学成（齐齐哈尔市劳动局锅炉检验所）关键词化工设备压力容器椭圆封头简便作图参数选择在化工设备压力容器制造中,对于椭圆封头制造加工以及封头样板检具制作,均要绘制椭圆...     

实时监控系统软件中组态参数动态调整的实现

本文介绍了目前国内外监控系统软件中存在的若干问题与不足,系统地提出了改进意见和建议。并结合监控软件应用开发实践,给出了相应的软件实现方法及程序设计框图。