MCS-51系统DA A指令浅析

本文就单片机的DA A指令出现的前提、指令的调整规则、指令的其它功能几方面进行了全面的分析。关于本指令的调整规则,文章采用了完全列举法进行了证明,并举例进行了验证;对于指令"减1"的功能,也详细进行了说明,同时给出了实例进行了验证。     

基于熵值模糊评判法的地域通信网脆弱性评估磁

地域通信网作为一种复杂网络系统,具有复杂性、模糊性和多变性等特性,对其脆弱性评估指标赋权时,如果主观性较强,就容易出现与实际数据不相符的现象。针对这一情况,提出将熵值模糊综合评判法应用于地域通信网脆弱性评估。依据地域通信网的实际情况,建立层次化的脆弱性指标体系,在此基础上建立模糊集合及隶属度矩阵。运用熵值法对评价指标进行赋权,依次得到各层指标模糊评价,求得评估结果的数值。该方法充分保证了评估指标权重的客观性,能够更准确、方便地描述地域通信网的脆弱性。     

陀螺稳定装置载体角振动仿真模型构建方法

建立了坦克装甲车辆行驶角振动和陀螺稳定装置载体角振动关系的数学模型,实现了在坦克装甲车辆行驶振动条件下火炮稳定性能的计算机仿真测试,为评价火炮控制系统的设计提供了一种依据。     

医学院校计算机基础课程教学研究探析

通过对我校非计算机专业开设的计算机基础课程教学状况出发,分析我校计算机基础教学的现状、存在的问题,以及提出促进教学改革的思路,结合实际情况,促进我校计算基础课程的教学质量,给其他医学类院校计算机课程教学提高一定的参考。     

煤矿井下语音应急广播系统的设计与实现

根据煤矿救灾应急的实际需要,提出了一种新型井下语音应急广播系统的设计方案,详细介绍该系统的设计原理、结构、主要功能和软硬件设计,重点阐述了系统发送端与接收端两个子系统实现的关键技术。运行结果表明,该系统稳定、可靠,音频播放流畅,能够满足矿井现场的实际需要。     

PP/弹性体/无机纳米粒子复合材料的研究进展

概述了目前PP 弹性体 无机纳米粒子三元复合体系的研究进展情况,包括:基体树脂的选择与改性、弹性体尤其是新型聚烯烃弹性体(POE)的应用、无机纳米粒子对复合体系的影响、增韧增强机理的研究等。     

四螺棱往复螺杆挤出机的研制

介绍了四螺棱往复螺杆挤出机的研制情况；着重叙述了新研发的四螺棱往复螺杆与传统的三螺棱往复螺杆的特性，并作了比较和分析；对四螺棱往复螺杆在设计和加工中的难点及其在工作时的“柔性”特征等进行了阐述。     

MODEL FOR PREDICTING THE LATERAL DISPERSION COEFFICIENT OF SOLIDS IN GAS-SOLIDS FLUIDIZED BEDS

The lateral mixing of solids in a gas-solids fluidized bed is very complicated.It can be caused by:(a)bubble movement through the bed,(b)bubble burst at the bed surface,and(c)gross particle circulation in thebed.However,experiments show that the major factors effected the lateral mixing of solids are the bubblemovement through the bed and the bubble burst at the bed surface.Thus a model with two mixing re-gions,i.e.mixing in bubble rising region and mixing in bubble breaking region,was proposed.Based on thismodel,an equation for predicting the lateral dispersion coefficient of solids in gas-solids fluidized beds wasderived without any adjustable parameter.The calculated values by this equation are well comparable withthe observed data including the present work and the other investigations.     

无线传感器网络多sink路由技术研究*

在介绍无线传感器网络路由协议的独有特点后,给出了传感器网络多sink路由协议的分类方法,然后着重分析了当前较为有代表性的多sink路由协议,在协议特点及其应用范围方面进行了研究与比较。最后,总结了多sink路由协议的研究的关键点及其发展趋势。     

Characteristics of oxygen consumption of coal at programmed temperatures

Oxygen consumption is an important index of coal oxidation.In order to explore the coal-oxygen reaction,we developed an experimental system of coal spontaneous combustion and tested oxygen consumption of differently ranked coals at programmed temperatures.The size of coal samples ranged from 0.18~0.42 mm and the system heat-rate was 0.8℃/min.The results show that,for high ranked coals,oxygen consumption rises with coal temperature as a piecewise non-linear process.The critical coal temperature is about 50%.Below this temperature,oxygen consumption decreases with rising coal temperatures and reached a minimum at 50℃,approximately.Subsequently,it begins to increase and the rate of growth clearly increased with temperature.For low ranked coals,this characteristic is inconspicuous or even non-existent.The difference in oxygen consumption at the same temperatures varies for differently ranked coals.The results show the difference in oxygen consumption of the coals tested in our study reached 78.6% at 100 ℃.Based on the theory of coal-oxygen reaction,these phenomena were analyzed from the point of view of physical and chemical characteristics,as well as the appearance of the coal-oxygen complex.From theoretical analyses and our experiments,we conclude that the oxygen consumption at programmed temperatures reflects the oxidation ability of coals perfectly.