MODELLING OF MICROSTRUCTURE EVOLUTION AND PROPERTIES OF LOW-CARBON STEELS

1.IntroductionMicrostructureprocessmodelsareincreasinglyonhotstriprollingofste.l[1--7].Thesemodelsfrequentlyincorporateagreatdealofempiricismwithcomparativelytightprocessrangesofapplicability.Morefundamentallybasedprocessmodelsarerequiredtodeveloppredictivetoolstooptimizetheproductionforawiderangeofmilldesignsandprocessingconditions.Theprocessofhotstriprollingoflow--carbonsteelscanbesubdividedintothreeprin-cipalstages:(i)reheating,(n)rollingand(iii)cooling(watercoolingontherun--outtableandsubs…     

ELIMIMATION OF RANDOM DEFACTS IN AEROSPACE MATERIALS

１．ＩｎｔｒｏｄｕｃｔｉｏｎＤｅｖｅｌｏｐｍｅｎｔｓｉｎｒｏｔａｔｉｎｇｐａｒｔｓｏｖｅｒｔｈｅｐａｓｔｄｅｃａｄｅｈａｖｅｎｏｔｓｅｅｎｔｈｅｅｘｔｅｎｓｉｖｅｉｎｔｒｏｄｕｃｔｉｏｎｏｆｎｅｗｍａｔｅｒｉａｌｓ,ｂｕｔｒａｔｈｅｒｔｈｅｍｏｒｅｒｉｇｏｒｏｕｓａｐｐｌｉｃａｔｉｏｎｏｆｅｘｉｓｔｉｎｇａｌｌｏｙｓａｓｏｕｒｕｎｄｅｒｓｔａｎｄｉｎｇｏｆｔｈｅｓｅｒｖｉｃｅｃｏｎｄｉｔｉｏｎｓａｎｄｍｅｃｈａｎｉｃａｌｒｅｑｕｉｒｅｍｅｎｔｓｈａｓｂｅｃｏｍｅｄｅｅｐｅｒ．Ｔｈｅｔｗｏｅｓｓｅ…     

PROGRESS IN STUDIES ON ICE ACCUMULATION IN RIVER BENDS

River ice is an important hydraulic element in temperate and polar environments and would affect hydrodynamic conditions of rivers through changes both in the boundary conditions and the thermal regime. The river bend has been reported as the common location for the initiation of ice jams because the water flow along a river bend is markedly affected by the channel curvature. In this article, the experimental studies about the ice accumulation in a river bend are reviewed. Based on experiments conducted so ...     

三种治疗宫颈糜烂方法临床研究

目的对宫颈糜烂的不同治疗方法进行研究。方法对2009年2月至2009年12月就诊于我医院妇科门诊愿意接受治疗的240例患者分别采用微波、CO2激光、LEEP刀治疗。结果微波组、CO2激光组、LEEP的一次治愈率分别为74.4%、71.1%、98.3%。结论轻度与中度糜烂首选物理治疗,重度宫颈糜宜使用LEEP治疗。     

57例肝囊肿外科手术临床治疗研究

目的对先天性肝囊肿患者外科手术治疗方法进行研究。方法回顾分析我院近几年来57个病例,分析不同手术方法的优缺点。结果17例剖腹开窗术术后1例因合并糖尿病术后出现切口感染。住院时间、术中出血量及手术时间剖腹开窗术组明显高于其他2组。结论腹腔镜开窗术可以作为治疗先天性肝囊肿的首选手段。     

引导未来生活的小发明

每年的发明展上，总能看到一些“慧眼识珠”的投资者或商家的身影，一旦寻到极具市场潜力的新点子，立马实现量产，推向市场。     

FLOATING RATE OF FRAZIL ICE PARTICLES IN FLOWING WATER IN BEND CHANNELS——A THREE-DIMENSIONAL NUMERICAL ANALYSIS

In this article,based on the theory of two-phase flow and laboratory data,a three-dimensionally model is developed to simulate the floating rates of frazil ice particles in water under covered condition.The Lagrangian trajectory method is used in the three dimensional simulation for floating rates of frazil ice particles along a 180o bend channel.The velocity profiles in longitudinal and transverse directions,the turbulence intensity,and the residual pressure are simulated.Under the condition of gravitation...