Influence of Rolling Temperature in Supercooled Liquid Region on the Surface Morphology of Zr_(52.5)Al_(10)Ni_(10)Cu_(15)Be_(12.5) Bulk Metallic Glass

1IntroductionSince a non-noble bulk metallic glassy alloy was dis-covered byInoue ,et al.[1]in 1988 , many stable amor-phous alloy systems with higher glass-forming abilityand lower critical cooling rates have been developed .Among them, Zr-based metallic glassy alloys are in-tenselyinvestigated because of their wider supercooledliquid region and other favorable thermodynamic andmechanical properties .In general ,surface morphologyof amorphous alloy parts is veryi mportant forindustri-al and …     

一种水泥厂除尘技术工作原理与实践：湿法高压静电组合式除尘器

介绍了一种水泥厂除尘的有效技术-湿法高压静电组合式除尘器，包括其构造、原理与应用实践，也包括该方法的优点和要求，以供同类企业的应用参考。对解决水泥厂粉尘污染问题有现实意义。     

Ti-IF钢在铁素体区热轧的析出物研究

通过透射电镜，观察了IF钢在铁素体区轧制时不同轧制工艺对析出物的形貌、大小、分布和数量方面的影响。结果发现：不同轧制工艺下的析出物基本上都是由TiN、TiS、Ti4C2S2和TiC组成，并且随着开轧温度的升高，析出物的总体平均尺寸减小，较小尺寸的二相粒子数量增多。     

Computation of rolling resistance caused by rubber hysteresis of truck radial tire

Applying the results of stress and strain calculated by 3D finite element model of truck radial tire 11.00R20, a MATLAB program used to compute rolling resistance of the tire caused by hysteresis rolling resistance (HRR) is worked out. The HRR distribution on different part of tire section, and the effects of speed, load, internal pressure and the width of the rim on HRR are analyzed. The analysis results showed that energy loss produced by tread rubber contributes the most part to HRR of the whole tire, and that to decrease the HRR, the hysteresis factor of the tread rubber should be reduced, and the distribution of the stress and strain on the section be optimized.     

冷轧机液压辊缝控制系统分析

HGC(液压辊缝控制)系统是AGC(厚度自动控制)系统的重要组成部分,其作用是与轧制速度控制系统、带钢张力控制系统一起保证板带材纵向厚度的均匀性和较高的厚度精度.本文针对某四机架冷连轧机液压压下系统轧制力方式下的控制模型仿真分析,研究其在轧制力控制方式下的动态特性,并为如何提高控制系统动态特性与优化调节参数提供了理论基础.     

新一代钢铁材料在铁路货车车辆上的应用探讨

回顾了我国铁路货车车辆用钢的发展及现状,提出了在高速重载条件下铁路货车车辆用钢的新要求。初步总结了新一代钢铁材料的发展及其特征,分析了新一代钢铁材料在铁路货车车辆应用的可行性,并对在应用中存在的问题提出了建议。     

小城镇建设规划若干问题思考——以西天尾镇区建设规划为例

通过对西天尾镇区建设规划剖析 ,引出小城镇建设规划中的“小城镇定位、规模确定、特色与风貌挖掘和滚动性近期规划”等若干问题的思考。     

ZR3轧机板形控制系统接口处理

硅钢厂ZR3轧机板形控制系统采用计算机实时控制，响应速度快，控制精度高。大大提高了硅钢产品的质量。     

Cycling

The resistance against a cyclist while riding on rollers is due mainly to rolling resistance produced by the deformation of the tyre as it rolls against small diameter drums. Resistance is then combined with wheel speed to set power output. The effect of tyre pressure and cross‐section on power was investigated by systematically altering the pressure (552 kPa, 690 kPa, and 827 kPa) in a 20c, 23c, 25c, and 28c tyre of the same design while riding at a wheel speed of 45 kph. Average power over 1 minute was measured with a Power Tap Hub (Tune Corporation, Cambridge, Massachusetts, USA) on five occasions. Statistical significance was evaluated at p < 0.05. Power requirements increased significantly with each reduction in tyre pressure for all tyres and pressures except the 25c between 690 and 827 kPa. The 20c tyre required significantly more power from the cyclist at each tested tyre pressure when compared to the other tyres (which were not different from each other). The differences in resistance from tyre size were not observed when ridden on the road. Additionally, a slightly different tyre design from the same manufacturer responded similarly in the 20c, but was significantly different in the 23c size. It was also observed that power requirements increased significantly when both the wheels were ridden on the rollers as compared to just the rear wheel. These results indicate that the power requirements may be significantly altered by the cyclist by adjusting tyre pressure, tyre cross‐section size, tyre type, and with the number of wheels contacting the rollers. However, the magnitude of these power requirements may not be suitable for intense workouts of trained cyclists.     

热轧钢带冷却过程建模及自动控制研究

通过研究热轧钢带的冷却过程,对其温度的变换进行了建模分析。根据所建立了数学模型,提出了基于反馈控制原理的温度控制方案,给出了反馈卷取温度控制的详细控制过程,最后结合实际的工作特点,对模型进行了分析与修正。