拉拔工艺对热镀锌钢丝性能的影响

介绍了拉拔工艺热镀锌钢丝σ、δ和扭转性能的影响,指出合理的拉拔工艺能改善热镀锌钢丝的综合力学性能。     

火花源光谱法分析φ0.8mm细焊丝的试验研究

本文对0.8mm细焊丝火花源光谱分析方法进行了试验研究 ,找出了最佳分析条件及干扰修正系数 ,拟定了相应的分析方案。方法简便、快速、准确。分析结果精度与准确度满足GB43 3 6-84及GB1 1 70 -89的要求。应用本法分析不同牌号的0 .8mm细焊丝样品 ,结果令人满意。     

φ550开坯车间一火成材线材技术改造的探讨

介绍了探讨了长钢三轧厂开坯车间半连续式轧机组线材技术改造和实现开坯车间一次成材。     

高频传输线方程适用性的讨论

采用严格的理论推出了具有普遍性的传输线方程,并讨论了经典传输线方程的局限性,对于同频条件下的电北问题具有指导意义。     

Simulation of Nano Si and Al Wires Growth on Si(1O0) Surface

Growth of nano Si and Al wires on the Si(100) surfaces is investigated by computer simulation, including the anisotropic diffusion and the anisotropic sticking. The diffusion rates along and across the substrate dimer rows are different, so are the sticking probabilities of an adatom, at the end sites of existing islands or the side sites. Both one-dimensional wires of Si and Al are perpendicular to the dimer rows of the substrate, though the diffusion of Si adatoms is contrary to that of Al adatoms, i.e. Si adatoms diffuse faster along the dimer rows while Al adatoms faster across the dimer rows. The simulation results also show that the shape anisotropy of islands is due to the sticking anisotropy rather than the diffusion anisotropy,which is in agreement with the experiments.     

Laboratory fretting tests with thin wire specimens

Wire ropes, due to their construction and application, are prone to fretting damages. In order to know the wear behaviour of individual wires under fretting conditions, laboratory tests are required. The present work describes the preliminary fretting tests accomplished with thin steel wires to optimise the testing procedure. The tests were carried out with ‘crossed‐cylinders’ configuration varying the stroke and normal load. Afterwards, the fretted surfaces were characterised by means of an optical and scanning electron microscope, and a diamond stylus. No significant influence of selected parameters was detected and a good correlation was proved for on‐line measured parameters and off‐line obtained values. Copyright © 2007 John Wiley & Sons, Ltd.     

螺旋肋筋预应力叠合板的试验研究

螺旋肋钢筋是近年来开发的高强钢筋新品种,具有粘结锚固强度高、预应力传递性能好的特点。通过对9块预应力叠合板的试验研究,探讨降低混凝土强度等级的可行性及降低混凝土强度后板的受力性能和生产工艺。     

贵金属包复线复合比及横向尺寸的测定

研究了通过测量试样的密度和质量来确定贵金属包复线材复合比及其横向几何尺寸（称重法）的方法,分析了方法的测量误差。用银包锡复合进行了验证。结果表明,本方法适用于贵金属包复线材。     

如何包覆非织造布梳理机的金属针布

根据非织造布梳理机的工作原理 ,论述了金属针布的使用性能及其特点 ,介绍了用车床包金属针布的工艺技术和实践方法。     

城市配电线路绝缘化和防雷措施

介绍了我国北京及日本等地城市配电线路换为绝缘线后发生的雷击断线事故 ,从理论上对雷击绝缘线断线的原因进行了分析 ,并以模拟试验对理论分析进行了验证和计算。证实了配电线路换为绝缘线后 ,如不采取相应的防雷措施 ,绝缘线断线事故会大幅上升。建议采取提高绝缘子的 50 %的放电电压 ,或按一定间距装置杆上避雷器或放电间隙等办法以起到避雷作用 ,以减少事故的发生