Reasoning Efficiency Research of Expert System for Biomass Soft-Sensor Modeling in Fermentation Process

An expert system for biomass soft-sensor hybrid modeling in fermentation process was decribed in this paper.A production rules representation based on database was presented.The definitions of production rules for biomass soft-sensor hybrid modeling knowledge were proposed.A knowledge base with layered structure was introduced.A breadth-first reasoning approach based on match degree(BFMD) was developed.The definition and calculation method of match degree were illustrated.Compared with the depth-first reaso...     

纸质包装箱的灭菌条件及其在屏障环境下的存放时限

目的研究实验动物纸质包装箱的灭菌条件及其在屏障环境下的存放时限。方法将包装箱用预真空高压蒸汽法灭菌,比较不同灭菌时间的灭菌效果;将彻底灭菌的包装箱在屏障环境下存放,检测不同存放时长下细菌生长情况。结果采用预真空高压蒸汽灭菌法抽真空3次、干燥5 min、121℃、25 min的灭菌条件能较彻底灭菌;存放时间3天以内,细菌检出率低。结论要实现包装箱灭菌彻底,灭菌时间需25 min;灭菌后的包装箱最好随灭随用,在屏障环境下存放的时间以不超过3天为宜。     

基于联合编程的船舶电力系统短路电流研究

为研究便捷高效的船舶交流电力系统短路电流计算方法,从整体上把握短路电流的变化规律,建立船用发电机、电动机的数学模型,开发出VB、Excel、MATLAB三种软件联合编程方法,利用实船参数对船舶交流电力系统的短路电流进行研究分析,获得短路电流数据及图像.研究表明,该方法在获得精确计算数据的同时,可以生成短路电流-时间曲线,直观反映了短路电流随时间的变化规律.     

Multi-Level Error Detection and Concealment Algorithm to Improve Speech Quality in GSM Full Rate Speech Codecs

Digital mobile telecommunication systems, such as the global system for mobile (GSM) system, want to further improve speech communication quality without changing the channel encoders and decoders. Speech quality is most affected by residual bit errors in received speech frames. Conventional methods use binary decision strategies for error detection and concealment in frames. This paper presents a multi-level error detection and concealment algorithm for GSM full rate speech codec systems. The algorithm use...     

Distributed Dynamic Navigation for Sensor Networks

Navigation with sensor networks has shown many advantages and great potential in many scenarios.Previous works have mainly focused on selecting the shortest path to navigate an internal user out of an emergency field.However,they did not consider variations of the dangerous areas which usually occur in practical applications.This paper presents an efficient dynamic routing algorithm to successfully guide users to the destination exit.The navigation goal is looking for a safe and short path to enable the user to escape from a dangerous area as fast as possible.Without knowing the locations of the nodes,the user is guided by a sequence of sensor nodes to pass through the dangerous areas.The algorithm ensures the navigation path security by predicting the dynamic changes affecting the navigation path.The performance of this approach is evaluated using extensive simulations to validate its effectiveness.Simulations show that the approach is scalable and performs well in various settings.     

A generalized block-by-block method for the system of linear Volterra integral equations of the second kind

In this paper,we provide a generalized block-by-block method for constructing block-by-block systems to solve the system of linear Volterra integral equations of the second kind,and then deduce some of the special cases.Compared with the expansion method and He’s homotopy perturbation method,respectively,numerical examples are given to certify the effectiveness of the method.The results show that the block-by-block method is very effective,simple,and of high accuracy in solving the system of linear Volterra integral equations of the second kind.     

一种无大爆炸量子动态宇宙模型

依据圈量子引力,计算出空时跃迁体积膨胀和度量起伏的结果,同时给出了引力场的一种生成途径.利用量子群SU 2 q表示的有限性,提出了一种不存在空时奇点的量子动态宇宙模型,并将其与大爆炸宇宙模型做了某些比较.     

VRM动态响应特性的研究

随着负载运算性能的提高,对供电的开关变换器电压调节模块(Voltage Regulator Module,VRM)提出了越来越高的要求,快速的负载响应性能就是被高度关注的性能之一.本文分析了影响VRM动态特性的因素,分类介绍了目前用于提高负载动态响应特性的方法,并对各类方法的优点与缺点进行论述.     

基于Ziegler-Nichols方法PID控制器的球杆系统

通过建立球杆系统机械模型、角度模型和电机模型,得到这个球杆系统的数学模型,设计PID控制器,通过在线整定控制器参数,提高球杆系统的控制性能.仿真实验结果证明:PID控制效果良好,适应能力较强,具有算法简单、参数整定容易等优点.     

混沌理论视角下旅游目的地危机管理体系的构建

立足于混沌理论对旅游目的地危机管理的思想启示,总结出旅游危机对旅游目的地的影响机制。在此基础上,文章从旅游危机预警和危机应对两个层面构建旅游目的地危机管理体系,并分别阐述了两个层面构建的内容,最终建立了旅游目的地危机防范的一般模型。