加筋土挡土墙的施工工艺

加筋土挡土墙具有受力的合理性 ,也具有其工艺的复杂性。文章从施工工艺控制的角度说明如何保证加筋土挡土墙路基复合结构的整体稳定性。     

车用永久磁铁缓速器的工作原理及使用

详细介绍了汽车用永久磁铁式缓速器的工作原理、使用方法，分析了三种不同类型永久磁铁式缓速器的结构，比较了三种结构类型的优点和各自的技术制约问题。     

正常年青人的诱发性耳声发射

在现有设备及条件的基础上,建立了一种高灵敏度的诱发性耳声发射(EOAE)测试系统,文中介绍了建立这一系统的具体方法及其测试条件。通过对15人30只听力正常耳的EOAE测试表明,短声和1kHz短音EOAE的检出率为100%,EOAE阈值与主观听阈密切相关,是一种比较理想的客观听力评价方法。该测试系统具有灵敏度高、信噪比大、抗干扰力强等优点,具有较强的实用性。     

37CrNi3钢过热后冷却方式对断口遗传的影响

本文结合金相组织,宏观断口和微观断口对37CrNi3钢经1300℃过热,并以不同方式冷却后,再经正常淬火消除过热粗大组织后出现的断口遗传现象进行了研究.结果表明,经过热后淬火,冷待淬火及空冷预处理所出现的断口遗传均属石状断口,其中经过热后直接淬火试样,断口遗传面积最小.     

Exploring the relationship between vehicle safety and fuel efficiency in automotive design

Panel data analysis is used within a fixed effect model to examine the relationship between vehicle safety ratings and fuel efficiency of 45 new vehicle models sold in the US between 2002 and 2007. While conventional wisdom and most early literature suggest that lighter, more fuel efficient vehicles are less safe to their occupants, the tests show a positive relationship between vehicle safety ratings and fuel efficiencies not only within and across most size classes but also for vehicles produced by both the US and Asian automakers. We also explore the design initiatives by manufacturers to compensate for the reductions in weight/size of fuel-efficient vehicles.     

拆船公约带来的法律责任和风险分析

国际海事组织2009年在香港通过的《2009香港国际安全与无害环境拆船公约》对船舶有害物的管理提出了法律要求.公约对船舶制造、营运管理以及拆船作业进行了规范,对航运界的多个利益方提出了要求.根据公约以及配套的一系列导则要求,对船舶有害物质全生命周期管理的法律责任及风险进行了分析,并对各利益方的具体履约要求进行了梳理,为我国航运界正确履约提供参考.     

基于GPS和北斗的时间标准频率系统的设计

文章介绍了一种小型化高精度时间频率系统,具有北斗、GPS、网络和北斗/GPS联合校时等多种方式校时,它用高精度原子钟作为本地时间守时源,大大提高了校时的精确性和守时的准确度。     

Research on the impact of CeO2-based solid solution metal oxide on combustion performance of diesel engine and emissions

This paper mainly studies on the performance of high-speed diesel engines and emission reduction when the engine uses heavy oil mixed with nanometer-sized additives Ce0.9 Cu0.1 O2 and Ce0.9 Zr0.1 O2.During the test,Indiset 620 combustion analyzer made by AVL,was used to make a real-time survey on the cylinder pressure,the fuel ignition moment,and establish a relation between the change trend of temperature in cylinder and the crank angle.For the engine burning heavy oil and heavy oil mixed with additives,combustion analysis software Indicom and Concerto were used to analyze its combustion process and emission conditions.Experimental investigation shows that nano-sized complex oxide can improve the performance of diesel engine fueled with heavy oil,and reduce the emission of pollutants like NOx and CO,comparing it with the pure heavy oil.According to the consequences of this experiment,the additives improve the overall performance in the use of heavy oil.     

国三EGR重型汽车限速功能原理及故障排查

限速功能是保证危险品运输车等有限速要求的车辆安全行车的重要途径,本文介绍了国三EGR重型汽车限速的实现方式,工作原理及故障的分析。     

摩擦焊机切飞边刀具国产化

随着经济发展,进口刀具在大部分企业中的应用越来越广泛,但是因为其采购成本高昂、周期长,也成为了制约企业生产的一个很重要因素。我公司重点设备——摩擦焊机所用的切飞边刀具就是很典型的一个例子。我们通过对其实施国产化,成功解决了公司在生产中的瓶颈问题,降低了刀具采购成本。