8098单片机在温度检测系统中的应用

主要介绍了8098单片机在温度检测系统中的应用。并详述了单点检测、循环检测、显示、打印及报警等功能。     

Three-dimensional Numerical Simulation of Combustion Field in the Combustion Chamber

In order to study the effect of rotation on the combustion in the underwater vehicle, a two-phase turbulent combustion process is described with Reynolds stress turbulence model, eddy-dissipation turbulent combustion model, P-1 radiation model and particle tracking model of liquid. The flow in the rotating combustion chamber is simulated at two different working speeds, 0 r/min and 1 000 r/min by Fluent software. The temperature, gas velocity, static pressure of wall and fuel concentration are computed and compared. The results show that the combustion in rotating combustor is faster and more effective.     

DDM4A数字显示表与PLC的连接

本文介绍了DDM4A数码显示表的主要特点及与PLC的接线方式,并给出了三菱FX系列PLC编程的多表显示例程。     

基于暂态分量的配电网单相接地故障测距的研究

在对配电网单相接地故障零序电流分析的基础上,提出了基于暂态分量的配电网单相接地故障测距方法,利用小波包重构系数形成各频段的能量值,构造出测距的特征向量,并引入支持向量机映射该特征向量与故障距离之间的对应关系.仿真结果证明该算法是有效的.     

智能涡街流量计的研制

介绍一种集温度、压力、流量就地显示于一体的智能涡街流量计的研制。采用先进的单片微机及微功耗芯片，实现在线多种信号采集和数据处理，并采用软件容错技术，大大提高了仪表的可靠性和测量准确度。     

跨平台Java多媒体显示系统创建研究

随着LED大屏及等离子大屏技术的成熟,大屏幕多媒体显示在各种场合被越来越多地使用。虽然已经有很多大屏显示系统被开发,但现时并没有太多使用Java开发的LED大屏多媒体播放系统,它们一般都存在无法跨平台使用的问题。简介了一个使用Java开发的具有跨平台性能的多媒体播放系统,图示了整个系统的基本构架;并对其中的一些关键技术,如：屏幕分割、分层显示、系统对事件监听的处理、文字处理框、数据库连接及同步、表格显示等进行了阐述。     

Research on Robust Control of Nonlinear Fuzzy VSS for Spacecraft

The nonlinear dynamic system of spacecraft with uncertainty and coupling is analyzed and its general dynamical equation is given. The decoupling-ability and controllability are proved. Aiming at this system, a new nonlinear decoupling controlling method is put forward by synthetically using the variable structure and fuzzy theory. The simulation results show that this method is effective in tracking performances under the existence of uncertainty and outer disturbance.     

用钻井液录井方法确定煤层气含量

该文从三个方面讨论了用钻井液录井方法确定煤层气含量技术,分别为用钻井液录井方法确定煤层气含量的理论依据;钻井液或空气钻井过程中确定煤层气含量的技术手段;实例分析及用于确定煤层气含量的罐解吸技术计算结果的比较。指出了用钻井液录井方法确定煤层气含量的主要技术参数以及参数换算的方法。这对指导国内煤层气井录井、提升煤层气井录井水平具有一定的促进作用。     

Thermo-Mechanical Analysis of Water-Cooled Gun Barrel During Burst Firing

The thermo-mechanical stress and deformation of water-cooled gun barrel during burst firing are studied by finite element analysis （FEA）. The problem is modeled in two steps： 1） A transient heat transfer analysis is first carried out in order to determine temperature evolution and to predict the residual temperatures during the burst firing event; 2） The thermo-mecha-nical stresses and deformation caused by both the residual temperature field and the gas pressure are then calculated. The results show that the residual temperature field tends to a steady state with the increasing of rounds. The residual temperature field has much effect on the gun barrel stress and deformation, especially on the assembly area between barrel and water jacket. The gage between the barrel and water jacket is the critical factor to the thermo- mechanical stress and deformation. The results of this analysis will be very useful to develop the new strength design theory of the liquid-cooled gun barrel.     

Turbo-DFH Coding and Iterative Decoding

We combine the Turbo codes with differential frequency hopping （DFH） technique and propose a new technique called Turbo-DFH coding. The structures of Turbo-DFH encoder and decoder are given. Taking aim at characteristic of Turbo-DFH system, the modified Log-MAP algorithm is presented and used for iterative decoding of Turbo-DFH decoder. Simulation results show that because the ideas of random coding and iterative decoding are used, the bit error rate （BER） performance of the Turbo-DFH system is better than that of the conventional DFH system.