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Upward Molten Flow for Optimization of Fluid Flow in Continuous Casting Tundish

Journal of Iron and Steel Research International 2010年第11期17卷 29-33页

作者： A R Alaei h edris E Shirani Department of Materials Engineering Isfahan University of Technology Department of Mechanical Engineering Isfahan University of Technology

Fluid flow pattern and buoyancy force support the motion of nonmetallic inclusions toward thetundish slag. Upward molten flow was investigated. To understand the fundamentals of the process, physical modelling was carried out with the utilization of a 1 ： 4 scale model. Numerical modelling was carried out in line with the physicai modelling to examine details of the flow pattern and rotational effect caused by the upward flow with the Commercial CFD （Computational Fluid Dynamics） package environment, FLUENT. The two-equation κ-ε model was used to simulate the turbulence. Multiphase fluid flow was numerically simulated by using the Volume of Fluid （VoF） method. The simulation can predict free surface waves and other phenomena, which can be used to optimize these important metallurgical operations.

关键词： upward flow continuous casting tundish numerical model water model

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Effects of Annealing on the Fabrication of Al-TiAl3 Nanocomposites Before and After Accumulative Roll Bonding and Evaluation of Strengthening Mechanisms

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Acta Metallurgica Sinica(English Letters) 2022年第4期35卷 636-650页

作者： Zohreh Yazdani Mohammad Reza Toroghinejad hossein edris Department of Materials Engineering Isfahan University of Technology84156-83111 IsfahanIran

The strengthening mechanisms of Al-TiAl_(3) nanocomposite, fabricated using cold roll bonding, annealing, and accumulative roll bonding(ARB) on Al sheets sandwiching with pure Ti powder were investigated in the present study. With annealing at 590 ℃ for 2 h, TiAl_(3) intermetallic compound was formed. After subsequent ARB process up to 5 cycles, final composite consists of ultrafine Al grains of less than 500 nm with TiAl_(3) particles larger than 200 nm. The strength and hardness of the final composite are 2.5 and 3.5 times the initial values, with an ultimate tensile strength of 400 MPa, which is dominated by grain-boundary strengthening due to the ultrafine Al grains, and Orowan strengthening due to the small TiAl_(3) particles. For comparison, an alternative fabrication route of cold roll bonding–ARB–annealing was also studied. This study showed that annealing before ARB is a critical factor in producing an ultrafine grain structure containing TiAl_(3) particles.

关键词： Composite Annealing Strength Microstructure Al

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血糖和血钙预测主动脉根部扩张性疾病的倾向性评分匹配研究

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中国胸心血管外科临床杂志 2024年第9期31卷 1327-1332页

作者：李子垚宋政坤伊地力斯·阿吾提霍强新疆医科大学第一附属医院胸外科乌鲁木齐830000 南方医科大学南方医院心血管外科广州510515 新疆医科大学第一附属医院心外科乌鲁木齐830000

目的分析血糖和血钙对主动脉根部扩张性疾病发生、发展的影响。方法回顾性分析2011年1月—2021年10月于新疆医科大学第一附属医院心外科行手术治疗主动脉根部扩大患者的临床资料。根据是否伴有急性主动脉夹层(Stanford A型)将患者分为两... 详细信息

目的分析血糖和血钙对主动脉根部扩张性疾病发生、发展的影响。方法回顾性分析2011年1月—2021年10月于新疆医科大学第一附属医院心外科行手术治疗主动脉根部扩大患者的临床资料。根据是否伴有急性主动脉夹层(Stanford A型)将患者分为两组,并应用倾向性评分法对其进行匹配。采用单因素和多因素logistic回归模型分析患者入院24 h内的血糖和血钙对主动脉根部扩张的影响,并绘制其受试者工作特征(receiver operating characteristic,ROC)曲线。结果成功匹配184对患者,其中男297例[平均年龄(48.76±9.62)岁]、女71例[平均年龄(49.97±10.97)岁]。民族、高血压史、主动脉根部直径、血钙以及血糖在两组患者中差异具有统计学意义(Phe curve,AUC)为0.742、血钙AUC为0.737,均对主动脉根部扩张伴夹层有一定的预测价值。结论高血糖和低血钙是主动脉根部扩张性疾病发生、发展的危险因素,某种程度上可用作筛选主动脉根部扩张性疾病高危患者的指标。

关键词：主动脉根部扩张主动脉夹层血糖血钙

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One hundred and one over-the-scope-clip applications forsevere gastrointestinal bleeding,leaks and fistulas

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World Journal of Gastroenterology 2016年第5期22卷 1844-1853页

作者： edris Wedi Susana Gonzalez Detlev Menke Elena Kruse Kai Matthes Juergen hochberger Department of Gastroenterology Nouvel Hôpital Civil and IHUStrasbourg University HospitalsF-67091 StrasbourgFrance Department of Medicine III-Gastroenterology Interventional EndoscopySt.Bernward Academic Teaching HospitalD-31134 HildesheimGermany henry D Janowitz Division of Gastroenterology Icahn School of Medicine at Mount SinaiNew YorkNY 10023United States Department of Anesthesiology Perioperative and Pain MedicineBoston Children’s HospitalHarvard Medical SchoolBostonMA 02115United States Section of Gastroenterology and GI Endoscopy Interdisciplinary Center for Digestive DiseasesStrasbourg University HospitalsNouvel Hôpital Civil and IHUF-67091 StrasbourgFrance

AIM: To investigate the efficacy and clinical outcome of patients treated with an over-the-scope-clip(OTSC) system for severe gastrointestinal hemorrhage, perforations and ***: From 02-2009 to 10-2012, 84 patients were treated with 101 OTSC clips. 41 patients(48.8%) presented with severe upper-gastrointestinal(GI) bleeding, 3(3.6%) patients with lower-GI bleeding, 7 patients(8.3%) underwent perforation closure, 18 patients(21.4%) had prevention of secondary perforation, 12 patients(14.3%) had control of secondary bleeding after endoscopic mucosal resection or endoscopic submucosal dissection(ESD) and 3 patients(3.6%) had an intervention on a chronic fistula. RESULTS: In 78/84 patients(92.8%), primary treatment with the OTSC was technically successful. Clinical primary success was achieved in 75/84 patients(89.28%). The overall mortality in the study patients was 11/84(13.1%) and was seen in patients with life threatning upper GI hemorrhage. There was no mortality in any other treatment group. In detail OTSC application lead to a clinical success in 35/41(85.36%) patients with upper GI bleeding and in 3/3 patients with lower GI bleeding. Technical success of perforation closure was 100% while clinical success was seen in 4/7 cases(57.14%) due to attendant circumstances unrelated to the OTSC. Technical and clinic success was achieved in 18/18(100%) patients for the prevention of bleeding or perforation after endoscopic mucosal resection and ESD and in 3/3 cases of fistula closure. Two application-related complications were seen(2%).CONCLUSION: This largest single center experience published so far confirms the value of the OTSC for GI emergencies and complications. Further clinical experience will help to identify optimal indications for its targeted and prophylactic use.

关键词： Over-the-scope-clip Endoscopic therapy Gastrointestinal bleeding Perforation Fistula

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