Grain-refining persistency of Al-based alloy produced by electrolyzing

The Al-based alloy with equiaxed grains was directly produced in the industrial aluminum electrolyzer. The varieties of grain features and grain sizes vs the re-melting times of this alloy were investigated. The grain features and mechanical properties of A356 alloy made from this alloy during the several re-melted times were also studied. The results show that the Al-based alloy after re-melted for 6 times, and A356 after re-melted for 3 times, both remained and refined grains and A356 alloy could achieve favorable mechanical properties. All these should be attributed to the electrolyzing procedure, in which nucleates, such as Al3Ti, are distributed fully and even in the based alloy. Producing Al-based alloy in the industrial electrolyzer provides a new, efficient and practical grain-refining route.     

2002年上半年度铅、锌市场分析会及中国再生铅工业研讨会

2002年上半年度铅、锌市场分析会及中国再生铅工业研讨会$江苏春兴集团@马永刚     

射频磁控管等离子体低能大流量反应离子腐蚀

本文研究了在碳氟化合物气体中SiO_2和Si的磁控管等离子体腐蚀。这种等离子体具有很高的离化程度,无碰撞密度,低能离子流量(在1W/cm~2的情况下I～1.0mA/cm~2,30(?)E_i(?)250eV)和可控的腐蚀均匀性。大部分等离子体维持一个电场,电场可被整形以对腐蚀表面完成标准的离子轰击。研究证明该腐蚀方法具有良好各向异性,SiO_2/Si的选择性较高,腐蚀速率比常规的反应离子腐蚀高六倍。     

光纤光导分光光度计

介绍了用“双臂光出电回”的方法把UV-365紫外/可见/近红外分光光度计改装成光纤光导分光光度计,光纤长5m。还介绍了用“单臂光出光回”的方法把λ_(19)紫外/可见/近红外分光光度计改装成光纤光导分光光度计,光纤长10m。改装后的光纤光导分光光度计能和本机一样正常工作,所以,特别适用于放射性工作。     

非线性NARMAX模型的ARMAX模型全局构造

给出一种复杂的、模型未知的非线性系统的全局线性化方法。该方法用时变的ARMAX模型近似描述一个非线性NARMAX模型。讨论了这一线性化方法的有界性并给出了相应线性化构造方法。仿真结果说明了该线性化方法的有效性。     

浅谈“绿色照明”的节能及推广对策

阐述推广“绿色照明”的经济和社会效益及其相应对策     

盒式磁带录像机的维护

随着电视技术不断发展，电视设备数字化呈必然趋势。数字录像机已进入实用阶段。数字录像机以其优良技术指标和优质的画面正引起各家电视台的注意。但是，数字录像机和数字录像带因其价格昂贵等其他原因（比如制式）要达到普及仍需相当长的时间。我们通常使用的录像机仍然是以Sony SP系列为代表的盒式磁带录像机。下面就盒式磁带录像机的维护和保养谈一下体会，供有关人员参考。