以国内某钢厂220 mm×1800 mm板坯连铸结晶器为原型,根据相似性原理建立相似比为0.6的水模型,利用粒子图像测速技术(PIV)对比不同浸入式水口(SEN)的出口角度、浸入深度及水口底部结构条件下的结晶器内流场流速特征,同时使用波高仪对液面波动振幅进行实时监测,并结合F数分析各SEN条件对结晶器内钢液流动特征.研究发现,在各浸入式水口条件下,位于结晶器液面1/4宽面处附近出现矢量流速向下的剪切流,同时在水口附近发现不规则漩涡.试验结果表明:浸入式水口的出口角度、浸入深度的增加能够强化上回旋区缓冲作用,降低结晶器液面表面流速;尽管凹底结构SEN能减弱钢液湍动能,但其对1/4宽面处剪切流速度的影响不大.另外,液面波动幅度和F数变化规律一致,且当浸入式水口出口角度15°、20°,浸入深度135 mm、145 mm条件下波幅与F数最为合理,从而减小或避免液面卷渣,提高连铸坯质量

英语作文35个加分句型 ~~the+~est+名词+(that)+主词+ have ever+sen known/heard/had/read, etc) the most+形容词+名词+(that)+主词+ have ever+sen known/heard/ had/read, etc) 例: Helen is the most beautiful girl that I have ever seen.海伦是我所看过 最美丽的女孩

hool of Business, Sun Y at-sen University L 2 Economic Transactions and Accounting Equation Self-Test Multiple choices 1. The ownership structure of a business includes the following forms

ask Team of FUNDAMENTAL ACCOUntING hool of Business, Sun Y at-sen University L 3 Analyzing and recording Accounting transactions Self-Test Multiple choices 1. The term credit means. A. to increase

Task Team of FUNDAMENTAL ACCOUNTING School of Business, Sun Yat-sen University Lesson 5 Completing the Accounting Cycle Closing entries An adjusted trial balance for Mariposo, Inc, at December 31 appears below MARIPOSO. INC

Task Team of FUNDAMENTAL ACCOUntING hool of Business, Sun Y at-sen University Lesson 6 Accounting for Merchandising Activities Exercise Calculation and Analysis Problems 1. OSu Co. is an office-supply store. The company uses a perpetual inventory system, records

ACCOUntING hool of Business, Sun Y at-sen University Lesson 7 Merchandise Inventories and cost of sales Exercise Calculation and Analyzing Problems 1. The perpetual inventory records of LIBY HOUSEHOLD show 150 units of a particular

Task Team of FUNDAMENTAL ACCOUNTING School of Business, Sun Yat-sen University Lesson 8 Accounting Information System Exercise Matching For each numbered item, choose the appropriate journal and write the identifying letter Bought merchandise on accou

Task Team of FUNDAMENTAL ACCOUntING hool of Business, Sun Y at-sen University Lesson 9 Financial Statements excises 1. The following financial statement information is known about five separate proprietorships Company Company Company Company Company December 31. 2001

Task Team of FUNDAMENTAL ACCOUntING hool of Business, Sun Y at-sen University Lesson 10 Understanding and Using financial Statements Exercise Short answer questions 1. What are the possible decisions that can be made with the use of financial analysis? Answer: Share investment decisions. This