渝怀铁路小板溪隧道施工技术

小板溪三线喇叭口隧道引进新奥法施工技术,采用上下半断面法开挖,变截面液压台车与泵送混凝土衬砌,全方位多角度地过程控制,不仅保证了工程质量,而且大大加快了工程进度。     

高大楼群中竖井石方爆破及震动控制

本文主要介绍了城市地铁施工中在高大楼群中进行竖井石方爆破时的震动控制及减少震动的技术措施,并简要地介绍了爆破震动监测方法及安全分析,可供类似工程借鉴。     

电喷汽油机进气管燃油动态模型及补偿的仿真

在燃油动态模型的基础上给出了空燃比动态补偿策略。通过MATLAB的SIMULINK仿真环境，对进气管燃油动态特性及其补偿器模型进行了仿真，并详细分析了模型参数对空燃比所产生的影响。     

纳米材料在汽车工业中的应用

介绍了纳米材料在汽车涂料及汽车工业中的应用及研究情况，并展望了纳米材料应用技术的未来。利用纳米材料特殊的抗紫外线、高强度和韧性、良好的静电屏蔽效应及抗菌消臭功能，开发和制备新型汽车涂料、纳米复合材料车体、纳米发动机及纳米汽车润滑剂、尾气净化剂等是可行的并具有广阔的应用前景。     

汽车主动悬架系统建模及其控制策略研究

介绍了一种主动悬架系统的建模，该系统是由液压作动器与一个普通弹簧串联后，再与被动阻尼器并联构成。其通常又被称作慢主动悬架。并应用SIMULINK语言仿真，确定了实际可行的输出反馈方案。     

台试与路试轮胎滚动阻力关联性研究

分析了台试与路试轮胎滚动阻力影响因素的内在联系；建立了台试与路试轮胎滚动阻力关联性模型；揭示了台试与路试轮胎滚动阻力之间的差异；解决了通过台试试验求解道路滚动阻力问题。     

柴油机排放后处理技术的进展及发展趋势

本文综述了柴油机排放主要是氮氧化物和微粒排放的后处理技术的新进展，并介绍了其发展趋势，指出机外净化将在满足未来排放法规过程中发挥越来越重要的作用，DeNOx-DPF组合形式的反应器系统将来可能会是一个较为理想的选择。     

Numerical Simulation of Carbon Concentration Profiles in Case Layer of Steel 20 RE-Carburized in Multipurpose Furnace with Drip-Feed Atmosphere

IntroductionTheworkonthermochemica1treatInntswithasadditiOnswasshmulatOdbybasicresearchinl982inChinall].SignilicantProgfesshasbeenmadedurillthepastdecadeinthefield.TheresultsshowthatontheonehandtheREe1emedscanacceleratethedecomPositionofthemediumandactiVatethecarburizedschceofsteelsandthusenhancethecoefficientofcarbontransfer(D").OntheotherhandatelevatedtemPeratUreREelements,althoughtheyhavemuchbiggeratOmicsizesthaniron,couddiffuseintobasedalloystOasignilicamdepth.MoreifllPortantiXtheP…     

考虑结构性的土体本构模型的建模方法

土体的结构性模型是土力学的核心问题.本文根据不同的模型理论和方法,把土体的结构性模型分为复合体本构模型、微观力学本构模型和土体的塑性理论模型,并对各个模型的研究现状、建模的思路与实质进行研究.     

Radar Emitter Signal Recognition Based on Complexity Features

Intra-pulse characteristics of different radar emitter signals reflect on signal waveform by way of changing frequency, phase and amplitude. A novel approach was proposed to extract complexity features of radar emitter signals in a wide range of signal-to-noise ratio ( SNR), and radial basis probability neural network (RBPNN) was used to recognize different radar emitter signals. Complexity features, including Lempel-Ziv complexity (LZC) and correlation dimension (CD), can measure the complexity and irregularity of signals, which mirrors the intra-pulse modulation laws of radar emitter signals. In an experiment, LZC and CD features of 10 typical radar emitter signals were extracted and RBPNN was applied to identify the 10 radar emitter signals. Simulation results show that the proposed approach is effective and has good application values because average accurate recognition rate is high when SNR varies in a wide range.