共搜索到18850条信息,每页显示10条信息,共1885页。用时:0小时0分0秒296毫秒
Master方程的修正及其对BA模型度分布的计算王双进,李凌云,张建河北工业大学理学院摘 要:Master方程是计算无标度网络度分布演化规律的一种常用方法.提出了对原始的Master方程进行修正,加入了节点增长机制,修正后的Master方程具有离散性,能够更精确,更有效的计算真实复杂网络的度分布演化规律.用修正的Master方程分析BA模型度分布的解析式并计算,由此得到BA模型度分布对数图.把离散性的Master方程与连续性的平均场理论进行对比分析,并在同一坐标系下分别做出用两种理论计算的BA模型度分布的对数图.关键词:Master方程;BA模型;度分布;节点增长机制;......
Refining Effect of a New Al3Ti1B1RE Master Alloy on Al Sheets Used for Can Manufacture and Behavior of Rare Earths in Master Alloy 傅高升1,陈文哲2,钱匡武2 (1.Department of Mechanical Engineering, Fuzhou University, Fuzhou 350002, China;2.College of Materials Science and Engineering, Fuzhou University, Fuzhou 350002, China) Abstract:The refining effect of Al3Ti1B1RE master alloy on Al sheets used......
......
基于Master CAM的数控代码转换系统开发及应用何培英,樊宁,师展郑州轻工业学院机电工程学院摘 要:MasterCAM内部虽然带有许多后置处理程序,但并不能直接应用于一些在我国使用比较普遍的数控系统.针对这一状况,在分析了Master CAM后置处理程序特点的基础上,构思系统的开发流程,利用VB 6.0程序开发环境进行相应的界面设计和程序开发,开发出了一个小型软件系统,可使Master CAM生成的后置处理程序直接转换为多种数控系统所需的NC代码,从而满足不同数控系统的需求.并以实际应用验证系统运行的实用性和可靠性,以及操作的简便性.关键词:Master CAM;数控代码;后置程序;转换系统;......
Xiu-fang. Grain refining effect of Al-Ti-C master alloy on Mg-Al alloys [J]. The Chinese Journal of Nonferrous Metals, 2003, 13(3): 622-625. (in Chinese) [13] KENNEDY A R, WESTON D P, JONES M I, ENEL... Grain refinement of AZ31 magnesium alloy by new Al-Ti-C master alloys HAN Guang(韩 广), LIU Xiang-fa(刘相法), DING Hai-min(丁海民) Key Laboratory for Liquid-Solid Structural Evolution......
Grain refinement of AZ31 magnesium alloy by Al-Ti-C-Y master alloy许春香,卢斌峰,吕正玲,梁伟摘 要:Al-Ti-C-Y master alloy was prepared by combining SHS technique and melting-casting method. The microstructure of master alloy and its grain-refining effect on AZ31 alloy were investigated by means of OM, XRD, SEM and EDS. Experimental results indicated that the prepared......
, WANG L, YANG W Y, MA H T. Combined effect and its mechanism of Al–3wt.%Ti–4wt.%B and Al–10wt.%Sr master alloy on microstructures of Al–Si–Cu alloy [J]. Materials Science and Engineering A, 2002, 328..., BHONDUS E. Master alloy for modification and grain refining of hypoeutectic and eutectic Al-Si foundry alloys: European, No. EP1134299 A1 [P]. 2001. [14] EASTON M, St. JOHN D. Grain refinement......
Preparation of AI-Ca Master Alloy by Electrolysis of Chloride-Fluoride Melts邱竹贤,苏全清摘 要:<正> Al-Ca master alloy was prepared in a labora-tory electrolysis cell.The operating parameters usedwere:temperature range 680-720℃,cathodic cur-rent density 0.76-1.10 A/cm2,bath compositionin wt-% 75-85 CaCl2+2-5 KCl+2-5 CaF2.Un-der optimal conditions......
Influencing Factors of Preparation of Al-Mg-Sc Master Alloy Zhang Guifang1,Zhang Zonghua1,Zhang Jun1 (1.Faculty of Land Resource Engineering, Kunming University of Science and Technology, Yunnan... of receives of scandium, and determined the technological conditions which uses the method of hot Al-Mg restoring anhydrous the chloride of scandium to prepare the Al-Mg-Sc master alloy. The best......
Influencing Factors of Preparation of Al-Mg-Sc Master Alloy张军,张宗华,张桂芳摘 要:Through the experiment, the reduced temperature, the containing scandium quantity... restoring anhydrous the chloride of scandium to prepare the Al-Mg-Sc master alloy. The best experimental technological conditions are that the master alloy can contains 8.0% of scandium while the restoring......