NUMERICAL SIMULATION OF TIP-CLEARANCE FLOW IN CASCADE

1 .　ＩＮＴＲＯＤＵＣＴＩＯＮＴｉｐ ｃｌｅａｒａｎｃｅｆｌｏｗｓｏｃｃｕｒｉｎｖａｒｉｏｕｓｅｎｇｉｎｅｅｒ ｉｎｇａｐｐｌｉｃａｔｉｏｎｓｓｕｃｈａｓａｘｉａｌ ｆｌｏｗ ｐｕｍｐｓａｎｄｄｕｃｔ ｅｄｐｒｏｐｅｌｌｅｒｓ .Ｔｈｅｉｎｅｒｔｉａｌｆｏｒｃｅｓａｃｔｉｎｇｕｐｏｎｔｈｅｆｌｕｉｄｉｎｔｈｅｎａｒｒｏｗ ｇａｐｂｅｔｗｅｅｎｂｌａｄｅｔｉｐａｎｄｔｈｅｓｕｒｒｏｕｎｄｉｎｇｗａｌｌａｒｅｓｕｆｆｉｃｉｅｎｔｔｏ ｇｅｎｅｒａｔｅａｔｉｐｌｅａｋａｇｅｖｏｒｔｅｘｏｎｔｈｅｓｕｃｔｉｏｎｓ…     

Community discovery method with uncertainty measure of overlappingnodes based on topological potential

Community discovery of complex networks,esp.of social networks,has been a hotly debated topic in academic circles in recent years.Since actual networks usually contain some overlapping nodes that are d...     

机身导轨烧伤原因与十字头的修复

空压机十字头按十字头体与滑履的连接方式分为整体式与分开式两种。整体十字头虽然结构较轻巧,制造方便,但磨损后不能调正与机身导轨间的间隙,给机器修理带来了困难。近年来,我厂先后承修了几台2Z—3/8—1型无油润滑立式空压机,其十字头为铸铁制成的整体式,配用圆柱形浮动十字头销。几年来我们常遇到机身导轨烧伤以及伴随而来的整体十字头的修复问题,为此我们进行了一些探讨,取得了一定的效果。     

High Efficient Technology of Steelmaking With Low Silicon Hot Metal on Large Converter

 To resolve the difficulty in slag formation during steelmaking with low silicon hot metal and to increase productivity, a new 5 hole lance was developed by increasing oxygen flow from 50 000 m3/h to 60 000 m3/h. Synthetic slag was added to adjust the slag composition. The problems such as difficulty in dephosphorization and slag adhesion to oxygen lance and hood were settled. Steel production and metal yield were increased and the nozzle life was prolonged through these techniques.     

Influence of Mn Content and Hot Deformation on Transformation Behavior of CMn Steels

The hot deformation behaviors and the microstructural evolution of plain CMn steels with similar contents of C and Si but different contents of Mn have been investigated by compressive processing using Gleeble1500 mechanical simulator. Influence of Mn and hot deformation on continuous cooling transformation of steels has been studied. The experimental results showed that deformation in austenite region accelerated transformation process, and the extent is dependent on the hot deformation and cooling conditions. The hot deformation would promote transformation process, but the increase of transformation temperature is dependent on Mn contents. The results have also shown that the effect of deformation on ferrite transformation becomes more obvious with the increase of Mn content at relatively low cooling rate.     

机加工工艺成本优化研究

描述机加工工艺成本优化的原理和降低成本的措施，建立了费用最低或加工时间最短的切削速度模型。     

Thermodynamic Properties of Carbon and Manganese in MnC and MnFeC Melts

Carbon solubility in MnFe melts (xMn=0083-0706, xFe=0034-0715) was measured experimentally at various temperatures. By thermodynamic derivation and calculation, the relationship between activity coefficient of carbon in infinite dilute solution of manganese in MnC system and temperature was obtained. Using GibbsDuhem relationship, the experimental results of this study, and experimental data obtained by strict thermodynamic derivation and calculation in references, the relationships between other thermodynamic properties (εCC, εCCC, εCFe, εCCFe, and εCFeFe) in MnFeC system and temperature were obtained.     

Ferroelectric Liquid Crystal Optical Switches

The dynamic response of molecular orientation, and the temperature and pulse shape dependences of the switching behavior in ferroelectric liquid crystal are described.The switching speed and the surface energy of ferroelectric liquid crystal are given.     

带饰面聚苯板作外墙内保温的研究

用高效保温材料作外墙内保温,由于施工中不需为此搭设脚手架,也不需防风雨侵袭的外包覆面层,作为节能墙体,较简便易行,所以是一种常用的建筑保温做法。特别对于旧建筑墙体的节能改造,施工方便,费用较低,更是一种经济实用的方法。如英国利物浦1985年改建的1.1万套住房,就采用了在外墙内侧加设保温层的方法。至于新建房屋,由于发达国家习惯用砖作为外墙面,所以实际上内保温仍采用得十分普遍。我国北方寒冷地区的外墙保温性能很差。如北京常用的37粘土砖墙传热系数为