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| 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 |
| 3 | Carvedilol for primary prophylaxis of variceal bleeding in cirrhotic patients with haemodynamic non-response to propranolol显示文摘 | Thomas Reiberger Gregor Ulbrich Arnulf Ferlitsch Berit Anna Payer Philipp Schwabl Matthias Pinter Birgit B Heinisch Michael Trauner Ludwig Kramer Markus Peck-Radosavljevic | 2013 | Gut2013，，11： | 2 |
| 4 | Vegetation pat ehes and runoff-erosion as interacting ecohydrological proces ses in semi-arid landscape 显示文摘 | Ludwig J A Wilcox B P Breshears D D | 2005 | Ecology2005，86，2： | 1 |
| 5 | Application of a new viscoelastic finite element method model and analysis of miniscrew-supported hybrid hyrax treatment显示文摘 | Ludwig B Baumgaertel S Zorkun B | 2013 | Am J Orthod Dentofacial Orthop2013，143，3： | 1 |
| 6 | Vegetation patches and runoff-erosion as interacting ecohydrological processes in semiarid landscapes 显示文摘 | Ludwig J A Wilcox B P Breshears D D | 2005 | Ecology2005，86，2： | 1 |
| 7 | An acoustic emission study of the effect of a magnetic field on the martensitic transition in Ni2MnGa显示文摘 | Ludwig B Strothkaemper C Klemradt U | 2009 | Applied Physics Letters2009，94，12： | 1 |
| 8 | Mesenchymal stem Cells (MSCs) display coordinated roiling and adhesion behavior on endothelial cells显示文摘 | Ruster B Gottig S Ludwig R J | 2006 | Blood2006，108，12： | 1 |
| 9 | Postthrombotic syndrome complicating a case of May-Thurner syndrome despite endovascular therapy:case report and review显示文摘 | Ludwig B Han T Amundson D | 2006 | Chest2006，129，5： | 1 |
| 10 | Endothelin (a) re- ceptor blockade reduces ischemia/reperfusion injury in pig pancreas transplantation显示文摘 | Witzigmann H Ludwig S Armann B | 2003 | Ann Surg2003，238，2： | 1 |
| 11 | Cytochrome c oxidase-structure,function,and physiology of a redox-driven molecular machine显示文摘 | Richter O M H Ludwig B | 2003 | Rev Physiol Biochem Pharmacol2003，147，： | 1 |
| 12 | Expression of interleukin- 12-related eytokine transcripts in inflammatory bowel disease: elevated interleukin-23p19 and interleukin-27p28 in Crohn' s disease but not in ulcerative colitis显示文摘 | Schmidt C Giese T Ludwig B | 2005 | Inflamm Bowel Dis2005，11，1： | 1 |
| 13 | Temporomandibular joint disk position assessed at coronal mr imaging in asymptomatic volunteers显示文摘 | Schmitter M Kress B Ludwig C | 2005 | Radiology2005，236，2： | 1 |
| 14 | Sox10-rtTA mouse line for tetracycline-inducible expression of transgenes in neural crest cells and oligodendrocytes显示文摘 | Ludwig A Schlierf B Schardt A | 2004 | Genesis2004，40，3： | 1 |
| 15 | Possible application of lasers in assisted reproductive technologies 显示文摘 | Schopper B Ludwig M Edenfeld J | 1999 | Hum Reprod1999，141，： | 1 |
| 16 | Review:Nonalcoholicsteatohepatitis显示文摘 | Ludwig J McGill D B Lindor K D | 1997 | Journal of Gastroenterology Hepatology1997，12，5： | 1 |
| 17 | Effect of Pressure Changes on the Inactivation of Bacillus subtillus Spores显示文摘 | Sojka B Ludwig H | 1997 | Pharm Ind1997，59，： | 1 |
| 18 | Effect of land use on the composition of soil organic matter in density and aggregate fractions as revealed by solid-state 13C NMR spectroscopy 显示文摘 | HELFRICH M LUDWIG B BUURMAN P FLESSA H | 2006 | Geoderma2006，136，： | 1 |
| 19 | Stabilization mechanisms of organic matter in four temperate soils: develop- ment and application of a conceptional model显示文摘 | LUTZOW M V KOGEL-KNABNER I LUDWIG B | 2008 | Journal of Plant Nutrition and Soil Science2008，171，： | 1 |
| 20 | Novel insights into the distribution of cardiac HCN channels:an expression study in the mouse heart 显示文摘 | Herrmann S Layh B Ludwig A | 2011 | J Mol Cell Cardiol2011，51，6： | 1 |
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