Influence of contaminations on combustion kinetics in hydrogen-fueled engine

In this work, we investigate the combustion of hydrogen fuel through the wind tunnel tests. Two kinds of fuel, the pure hydrogen and the hydrogen-ethene mixture, have been chosen to heat the oxygen-enriched air. It is found that the stable pressure in the engine combustor and the thrusts is almost the same in two cases. A valuable feature we revealed is that the heating pattern of hydrogen and ethene mixture leads to a considerable delay of the establishment of the wall pressure in the combustor, compared with the pure hydrogen case. This phenomenon implies a longer ignition delay time for the mixture case. The shorter ignition delay resulting from the hydrogen heater is attributed to the continuity of chain propagation and the exclusion of the less active C-containing radicals.     

Slip rate along the Lijiang-Ninglang fault zone estimated from repeating microearthquakes

Seismicity and slip rates along the Lijiang-Ninglang fault zone between 1999 and 2006 were investigated with the waveform data recorded by the Yunnan digital Seismic Network. The relocated seismicity by the double difference method clearly exhibits different features between the northern and southern segments. More than 76% earthquakes occurred in the southern segment of the fault near the Lijiang area. The relocated seismicity appears to reflect the crustal velocity structure of the study area. Using cross-correlation analysis, we identified a total of 92 doublets and 70 multiplets that show high waveform similarity. Most of these sequences are aperiodic with recurrence intervals varying from a few minutes to hundreds of days. Using two sequences that occurred regularly over the study period, we obtained a fault slip rate of approximately 5 mm/a at ∼23 km, in good agreement with geologic and surface GPS measurement. Supported by National Basic Research Program of China (Grant No. 2004CB418405) and National Natural Science Foundation of China (Grant No. 40174014)     

单片机技术在传感器设计中的应用

文章主要论述了单片机技术在传感器设计中的应用以及对其发展的影响.重点指出传感器本身的稳定性应该放在研究工作的首位,单片机技术和传感器相结合,改善了传感器本身抗干扰能力和促进了传感器本身的智能化与标准化等.     

人类神经退行性疾病与模式动物研究

大脑和脊髓由神经元组成,神经元一般不会再生,所以过度的损害可能是毁灭性的、不可逆转的.神经退行性疾病就是由于神经元的退行性病变和凋亡所致,随着时间的推移呈现一个渐进性的恶化,以导致机体认知记忆功能和运动功能障碍.     

基于嵌入式Linux的Web远程继电器控制系统的设计实现

介绍了一种运行在嵌入式Linux平台下的以Web模式远程控制系统的实现方式.对硬件系统架构进行了介绍.以uCLinux操作系统为软件平台,对Boa Web服务器进行配置,然后编写相应的CGI程序响应用户输入,操作底层硬件寄存器,从而达到远程控制的目的.     

论城市管理创新系统的构建

在创新型国家发展战略的指导下,构建城市管理创新系统具有重要的理论意义与现实意义。应当全面分析系统内外的积极因素与消极因素,设计适合城市发展的战略规划,引入知识管理、公众关系管理与流程再造。依托城市管理创新系统开展管理创新,改善城市政府的结构与功能,培养核心竞争力以加速构建和谐城市。     

船用舵机电液伺服单元单神经元自适应PID控制的研究

在分析了船用舵机电液伺服单元的基本原理和数学模型的基础上,设计了单神经元自适应PID控制器。用单神经元PID替代常规PID控制,通过神经元的学习来调整PID参数,利用神经网络良好的自适应和抗干扰能力．使控制系统对参数变化表现出良好的控制性能和鲁棒性。通过仿真证明了该系统有较好的控制效果。     

关于Diophantine方程nx(x+d)(x+2d)(x+3d)=y(y+d)(y+2d)(y+3d)的一点注记

设d是大于1的正整数.本文运用初等数论方法证明了:如果d的素因数P都适合P=2或者p=±3(mod 8),则方程2x(x+d)(x+2d)(x+3d)=y(y+d)(y+2d)(y+3d))仅有正整数解(x,y)=(4d,5d).     

多壁碳纳米管的纯化

研究了碳纳米管中各种不同形态的碳相在氢气氛下的甲烷化行为及其在碳纳米管纯化中的应用,研究结果表明,不同稳定性的碳相在氢气氛下的起始甲烷化温度是不一样的,构成碳纳米管主体的六元环的碳,较之类似活性碳的杂形碳以及主要由五元环和七元环构成的碳纳米小颗粒,在氢气氛下是较为稳定的,实验表明,通过控制甲烷化的温度以及尾气的相色谱检测可实现碳纳米管的纯化及纯化进程的实时在线监控。     

豫北地区蜜粉源植物的考察研究

本调查研究河南北部,黄河北岸地区内蜜粉源植物,初步筛选出蜜粉源植物376种及变种,隶属于81科233属。中着重分析了本地区主要蜜源、主要粉源、重要辅助蜜粉源植物,为科研和持续开发利用植物资源提供了科学依据。