质量动态管理在沥青混凝土路面施工中的应用

简要介绍了质量动态控制技术,并将平均值一极值控制图技术应用于广东茂湛二期高速公路的面层施工管理,实践表明,应用效果良好,路面施工质量得到良好地控制。展现了动态控制技术在沥青混凝土路面施工中的良好应用前景。     

柴油机推进特性试验系统

采用模糊控制技术,变频调节水力测功器给水量。任意设定推进特性曲线,自动进行柴油机推进特性工况试验。试验结果表明实测功率能较好地跟随设定功率（设定功率随转速而变化）。     

一种新型潜航器应急救生装置——爆涨式气囊工作原理初探

针对潜航器遭遇大幅度掉深险情,探讨了一种爆涨式气囊装置工作原理,通过对潜航器在大振幅内波环境中运动状态分析,提出了应急救生装置所需固态气体发生剂的最小体积及估算方法,以及爆涨式气体发生器及气囊结构的基本原理;确定了选择具有产气率高、气体产物温度低和无毒材料作为气体发生剂,以及耐腐蚀、柔韧性高和耐温高材料作为气囊材料的基本原则。应用分析表明:与传统潜航器应急救援手段相比,新型爆涨式气囊装置具有操作简单、可靠性高以及发挥作用快等优点。     

SPEECH ENHANCEMENT BASED ON DYNAMIC NOISE ESTIMATION WITHIN AUTO-CORRELATION DOMAIN

IntroductionTo improve the robustness of recognition sys-tems in real environment,many theories and ap-proaches have been brought forward to suppressthe environmental noise ( background noise,chan-nel distortion,etc) ,and they can be divided intothree types according to their thoughts:speech en-hancement,robust feature vector and model com-position. The approach of speech enhancementconsiders extracting clean speech signal fromspeech signal corrupted by noise,typically as SSmethod[1] ( to supp…     

ZXC区间信号综合监测系统原理研究

随着铁路的不断提速,列车运行对信号设备的依赖越来越强。由于区间ZPW-2000设备故障具有影响大、延时长的特点,而现有的信号微机监测对其只局限于监测室内数据,因此,为及时准确地对区间室外设备进行有效监督,开发研制了ZXC区间信号综合监测系统,现将有关原理介绍如下。     

绝对测量在无砟轨道的轨向控制中的精度分析

研究目的:目前,我国高速铁路无砟轨道的精调主要是基于全站仪的绝对测量精调模式,其是以外部几何状态来控制内部几何状态,该方法与轨道平顺性的概念并不完全兼容。本文从绝对测量精调技术的误差分析出发,分析在轨道平顺性模型中该精调模式的控制精度。研究结论:通过理论分析及实验数据表明,配以高精度全站仪,绝对测量模式能够保证高速铁路±2 mm的平面控制精度要求。     

改善砂砾填料摩阻力的试验研究

砂砾是一种广泛用于路基修筑的建筑材料,但由于其棱角比较圆滑,造成较难压实的问题。利用砂砾和石渣在抗剪强度性质上的差异,提出了改善砂砾内摩阻力的方法,并在试验室进行了振动压实成型试验,为现场改善砂砾路基的压实效果奠定了基础。     

A NEW RSA CRYPTOSYSTEM HARDWARE IMPLEMENTATION BASED ON MONTGOMERY‘S ALGORITHM

IntroductionData security is becoming a more and more im-portantissue nowadays with the ever- creasing pop-ularity of electronical communication[1] . The fun-damental security requirements include confiden-tiality,authentication,data integrity,and nonre-pudiation.To provide such security services,mostsystems use public key cryptography. Among thevarious public key cryptography algorithms,theRSA cryptosystem is the bestknown,most versa-tile,and widely used public key cryptosystem to-day.In pu…     

理性主义发展观与非理性主义发展观探索

理性主义发展观与非理性主义发展观有明显的偏见。只有把理性主义发展观和非理性主义发展观整全才能建构出我们时代新的发展观。新的发展观是一种以人为中心、以经济发展为关键的、可持续的、开放的、多样性的发展观，是一种创新的发展观。它强调人与自然、人与社会、人自身的协调发展。新的发展观是马克思主义社会发展理论的具体应用。     

The Tip Leakage Flow Structure of an Axial Fan with Tip Clearance

Experiment and numerical simulation technique are used to investigate the tip leakage flow in an axial fan with tip clearance at the design condition. The flow field in the tip region of fan is measured using a PDA (Particle Dynamics Analysis) system. The flow is surveyed across the whole passage at fifteen axial locations (from the 100% axial chord in front of the leading edge to the 100% axial chord behind the trailing edge), mainly focusing on the outer 90% blade span. Both experiment measurement and numerical simulation indicates the leakage flow orig-inated from the tip clearance along the chord rolls-up into three-dimensional spiral structure to form leakage flow vortex. The interaction of leakage flow and main flow will produce the low velocity zone, and block the flow. The leakage flow almost occupies the most part of flow passage behind the trailing edge.