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1125篇 您的检索式:作者名="LUDWIG M"
    题名 作者 年代 出处 被引量
1等轴球晶凝固多相体系内热溶质对流、补缩流及晶粒运动的数值模拟 Ⅰ.三相流模型显示文摘基于Eulerian-Eulerian方法和体积元平均技术,建立了模拟等轴球晶凝固过程的液、固、气三相流模型.液、固两相处理成相互分离、相互扩散的介质,气相与液、固两相只存在热量及动量的相互作用,三相(凝固前)作为自由流体共享一个统一的压力场.分别求解三相的质量、动量、溶质、热焓守恒方程;相间的热量交换和摩擦拖拽以及液/固界面上的溶质再分配和凝固潜热释放,通过定义对应守恒方程的源项和交换项而加以考虑;另外,单独求解一个晶粒密度守恒方程.晶粒的形核生长(相变) 也加以模型化并体现在对应的源项中,模型中所用的密度定义为溶质与温度的函数,因此可综合考虑热溶质对流、晶粒运动及凝固收缩所引起的补缩流动.凝固过程的体积收缩及补缩流动将体现在气/液自由表面的波动上.王同敏 姚山 张兴国 金俊泽 M Wu A Ludwig B Pustal A Bührig-Polaczek 2006金属学报2006,42,6:18
2等轴球晶凝固多相体系内热溶质对流、补缩流及晶粒运动的数值模拟 Ⅱ.模型的应用显示文摘利用等轴球晶三相凝固模型模拟了A356铝合金半固态浆料冷却斜槽法制备过程,研究了晶粒密度、尺寸及固相分数的分布与工艺参数的关系.结果表明,在斜槽浇注处晶粒形核密度最大,在斜槽末端晶粒尺寸、固相分数最大,在铸型中这三者的最终分布大致均匀.适当降低浇注温度有助于提高斜槽上形核密度和固相分数及降低晶粒尺寸.此外,还模拟了热溶质对流及补缩流在Al-4%Cu(质量分数)合金等轴球晶凝固过程所起的作用,以及晶粒运动及补缩流对合金自由表面和宏观偏析形成的影响.结果表明,凝固初期热对流及补缩流为主导,凝固中期热溶质对流为主导,凝固后期补缩流为主导;晶粒运动受阻程度直接影响自由表面形状,补缩流考虑与否导致完全不同的宏观偏析图.实验测得晶粒尺寸与模拟结果分布较相似,但其绝对值存在较大差异.王同敏 李廷举 曹志强 金俊泽 T Grimmig A Bührig-Polaczek M Wu A Ludwig 2006金属学报2006,42,6:7
3The long-term pathological evolution of chronic hepatitis C显示文摘M Yano H Kumada M Kage K Ikeda K Shimamatsu O Inoue E Hashimoto JH Lefkowitch J Ludwig K Okuda 1996Hepatology1996,,6:2
4Spin hamiltonian of Co2+显示文摘Ham F S Ludwig G M Watkins G D 1960Phys Rev Lett1960,5,:2
5The flavonoid phloretin suppresses stimulated expression of endothelialadhesion molecules and reduces activation of human platelets 显示文摘Tangl V Lorenz M Ludwig A 2005The Journal of Nutrition2005,135,2:1
6Nonlinear parameter estimation of excitation systems 显示文摘BHASKAR R CROW M L LUDWIG E 2000IEEE Transactions on Power Systems2000,15,4:1
7Intima media thickness of the carotid arteries:early pointer to arteriosclerosis and therapeutic endpoint显示文摘LUDWIG M VON PETZINGER-KRUT HOFF A VON BUQUOY M 2003Ultraschall Med2003,24,3:1
8Diffusion Coefficients of Uranium (Ⅵ), Rhenium (Ⅶ) and Technetium (Ⅶ) in Nitric Acid and Tri-Bu-tylphosphate Diluted in Dodecane显示文摘Nabeshima M Ludwig R Nguyen T K D 2000Solvent Extr Res Dev2000,7,:1
9New scan and control system for high powe electron beam techniques显示文摘Bahr M Hoffmann G Ludwig R 1998Surface and Coatings Technique1998,98,:1
10Preliminary results of staged anterior debridement and reconstruction using titanium mesh cages in the treatment of thoracolumbar vertebral osteomyeli- tis显示文摘Fayazi AH Ludwig SC Dabbah M etal 2004Spine J2004,4,4:1
11TP53 mutation and p53 overexpression for prediction of response to neoadjuvant treatment in breast cancer patients显示文摘Kandioler-Eckersberger D Ludwig C Rudas M 2000Clin Cancer Res2000,6,1:1
12Cervical pedical screws:comparative accuracy of two insertion techniques显示文摘Steven C Ludwig MD Joseph M 2000Spine2000,25,20:1
13Coat Color Variation at the Beginning of Horse Domestication 显示文摘LUDWIG A PRUVOST M REISSMANN M 2009Science2009,324,:1
14Influence of autogenousleucocytes and Escherichia coli on sperm motility parameters in vitro显示文摘Diemer T Huwe P Ludwig M 2003Andrologia2003,35,2:1
15Pharmacokinetic results of aphase I trial of sorafenib in combination with dacarbazine in patients with advanced solid tumors 显示文摘Brendel E Ludwig M Lathia C 2011Cancer Chemother Pharmacol2011,68,:1
16Intesive All-type therspy without local radiotherapy provides 90% EFS for children with T-cell lymphoblastic lymphoma:a BFM Group report显示文摘Reiter A Schrappe M Ludwig WD 0,,02:1
17Optimizing the production of bacterial cellulose in surface culture: evaluation of substrate mass transfer influences on the bioreaction (Part 1) 显示文摘HORMUNG M LUDWIG M GERRARD M 2006Eng Life Sd2006,6,:1
18Determination of Mass Transfer Coefficients of ^99Tc(Ⅶ) in Forward Transport in Purex-Relvent Systems by Using Analytical Ultracentrifugation显示文摘Ludwig R Nabeshima M Nguyen T K D 2001Radiochim Acta2001,89,:1
19Localization of phycoerythrin at the lumennal surface of the thylakoid membrance in Rhodo- monas lens 显示文摘Ludwig M Gibbs S P 1989The Journal of Cell Biology1989,108,:1
20The effect of fluvastatin on cardiac events in patients with symptomatic coronary artery disease during one year of treatment 显示文摘Riegger G Abletshauser C Ludwig M 1999Atherosclerosis1999,144,1:1
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