ARM与射频芯片TRF796x的SPI通信研究

针对SPI总线接口缺乏标准协议的特点,提出了SPI器件之间通信的一般方法。论文阐述了ARM芯片内置SPI硬件控制器的工作原理和时序,并对射频芯片TRF7960x的工作模式与读写要求进行了分析。在此基础上,根据TRF796x的时序特性和访问要求,采用ARM芯片的硬件SPI方式实现对TRF796x的读写访问与控制,并在RFID门禁系统中验证了通信结果。     

表面致密化--一种提高烧结齿轮性能的有效方法

表面致密化与传统的粉末冶金方法相结合，可以显著改善烧结齿轮的疲劳及表面磨损性能。从而提高齿轮的寿命，同时使生产高性能齿轮的总成本降低，为用粉末冶金(PM)方法生产汽车变速箱齿轮提供了更大的可能性。本文着重讲述了使用这种方法生产高性能PM齿轮的工艺过程，同时介绍了测定致密化效果及齿轮性能的几种主要方法，并根据工艺过程比较了使用传统的机加工方法及本文所述的方法生产同性能齿轮的成本差别。最后，以两个实例分别介绍了使用上述方法对Volvo 850系第五挡变速齿轮及Scania载重车变速箱中行星齿轮的研发。     

基于MSP430的RFID读写器的设计

设计一种基于MSP430单片机的多协议RFID读写器。分析RFID概念、应用现状及系统构成,介绍两款主要芯片的功能特点,给出系统硬件组成结构．提出系统的软件组成模块及软件流程图。系统顺利通过测试,其设计达到相应的技术指标要求,具有良好的市场应用前景。     

个人状态远程监视及语音通讯系统研究

本文以MSP430系列的单片机为核心,提出了个人状态远程监视及语音通讯系统方案。该系统能采集个人的心率、血压和体温等生命信息,并实现对象间的无线语音通讯。     

Auto-ignition of toluene-doped n-heptane and iso-octane/air mixtures: High-pressure shock-tube experiments and kinetics modeling

Toluene is often used as a fluorescent tracer for fuel concentration measurements, but without considering whether it affects the auto-ignition properties of the base fuel. We investigate the auto-ignition of pure toluene and its influence on the auto-ignition of n-heptane and iso-octane/air mixtures under engine-relevant conditions at typical tracer concentrations. Ignition delay times τ_ign were measured behind reflected shock waves in mixtures with air at φ = 1.0 and 0.5 at p = 40 bar, over a temperature range of T = 700–1200 K and compared to numerical results using two different mechanisms. Based on the models, information is derived about the relative influence of toluene on τ_ign on the base fuels as function of temperature. For typical toluene tracer concentrations ?10%, the ignition delay time τ_ign changes by less than 10% in the relevant pressure and temperature range.     

TRFLP在微生物群落结构与动态分析中的应用

介绍了末端限制性片段长度多态性技术(TRFLP)的基本原理和操作要点,综述了该技术在土壤、肠道、受污染环境以及污染物处理工艺微生物群落结构、动态分析中的应用.由于技术整合了自动测序仪的高分辨率和高通量特征,对分析复杂群落的结构较其它指纹技术更具有明显优势和广阔的应用前景.对于无法将特异条带进行测序分析及原位杂交的缺点,可通过与克隆文库序列进行比较,并采用软件将多酶切的末端限制性片段(TRFs)与现有数据库进行叠加比较的方式加以弥补.     

Cross-informant symptoms from CBCL, TRF, and YSR: Trait and method variance in a normative sample of Russian youths.

A large community-based sample of Russian youths (n = 841, age M = 13.17 years, SD = 2.51) was assessed with the Child Behavior Checklist (mothers and fathers separately), Teacher's Report Form, and Youth Self-Report. The multiple indicator-version of the correlated trait-correlated method minus one, or CT-C(M ? 1), model was applied to analyze (a) the convergent and divergent validity of these instruments in Russia, (b) the degree of trait-specificity of rater biases, and (c) potential predictors of rater-specific effects. As expected, based on the published results from different countries and in different languages, the convergent validity of the instruments was rather high between mother and father reports, but rather low for parent, teacher, and self-reports. For self- and teacher reports, rater-specific effects were related to age and gender of the children for some traits. These results, once again, attest to the importance of incorporating information from multiple observers when psychopathological traits are evaluated in children and adolescents. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

智能车竞赛中直流电机调速系统的设计与比较

针对大学生智能车竞赛中直流电机的驱动设计了6种方案,经过实验比较分析了各种方案的优缺点,最后确立了一套驱动能力强、体积小、性能稳定的驱动方法,可广泛应用于40 V以下的大功率直流电机驱动的场合.     

基于C8051F021的采煤机遥控系统设计和研究

针对目前采煤机滚筒自动调高和远程遥控的不足,设计了基于C8051F021和TRF6900A的遥控系统.系统以C8051F021为核心设计辅助电路,具有传统遥控器的控制和关键参数显示功能,同时还具有关键参数超限的语音等报警功能,方便工作人员远程安全监控采煤机的作业.     

辐条式高温合金涡轮后机匣焊接工艺研究

涡轮后机匣是某型燃机的重要承力构件,属于辐条式结构,由多个零件通过氩弧焊和电子束焊接而成,材料为GH4169和K4169。涡轮后机匣的结构复杂,焊缝数量多,焊接变形机理极为复杂,控制焊接变形难度极大。着重介绍了在排除某型燃机涡轮后机匣裂纹故障过程中,基于热量不协调开展机理分析以及焊接结构与焊接冶金学原理的分析,制订了焊接工艺,并详细阐述了减小焊接变形采取的各种措施。按照优化后的焊接生产工艺,涡轮后机匣的试验件完全满足设计要求,并经过评审鉴定后通过了装机耐久性试验。