高压供气系统设计安装问题浅析

高压气源站作为一种动力和测试气源,广泛应用在航天、航空、船舶、化工、制药等行业,具有不可替代的作用。高压气站供气系统安全正常运行的基础是设计科学,安装合理。本文在对多个高压供气系统分析总结的基础上找出了现在高压供气安装中存在的问题,分析了原因,规范了管道安装的有关工艺流程和安装测试方法。     

加强设计和施工管理合理降低工程造价

要合理降低工程造价,就要从最初的优化设计方案入手,而且一开始就实施限额拄制,使其能从横纵向全面推开。并且在施工组织中对现场平面位置设计、施工方案选择,运输安排也要全面衡量,做好管理。     

发展浙江港口现代物流

现代物流业是新经济时代的重要组成部分,是21世纪全球重点发展的产业之一,也是浙江省“十五”期间重点培育产业之一。现代物流是一种先进的组织方式和管理技术,利用现代信息技术和手段对商品从订货、生产、销售到售后服务的所有环节进行整合、实行全程物流管理,提高整体效率、节约费用、降低成本,有着“第三利润源泉”之称。交通运输是物流的重要环节,而港口是运输交汇、货物集散的枢纽,外贸货物物流的最佳交汇、集结点。港口物流的发展依存于港口服务,同时又给港口发展创造新的机遇,两者形成相辅相成、相互促进的关系。开展港口物流,需有先…     

摩托再伴人生路

1995年,我拥有了第一辆摩托--JC70-A,从此我枯燥的生活变得充实多彩.JC70极大地方便了我的工作和生活,几乎每天我都是骑着它顶着满天星斗或者身披晚霞奔走在上下班的途中.闲暇时光,它则陪伴我头戴斗笠流连在湖光山色中悬丝垂钓,或者载着我驶向风景秀丽的异域他乡……我们相濡以沫厮守陪伴8年,结下了难以忘怀的深厚友谊.     

Determination of interfacial heat flux of stainless steel solidification on copper substrate during the first 0.2 s

Interfacial heat transfer is a key issue in many solidification processes. In the paper, a novel experimental apparatus has been designed and on this basis, the instantaneous interfacial heat transfer between molten steel or solidified shell and copper substrate during the first 0.2 s has been studied. The investigated parameters include melt superheat, substrate temperature and surface roughness. The results show that the peak value of the interfacial heat flux in the first stage of liquid/solid contact increases with melt superheat and changes slightly with substrate temperature and surface roughness. The interfacial heat flux in the stage of solid/solid contact has a similar trend of slow decrease in most conditions.     

浙江国际海运现状与展望

进入21世纪，经济全球化、资本国际化、高新技术迅猛发展，对世界经济和贸易产生了极其深远的影响，给浙江国际海运业带来了新的发展机遇和挑战。[编者按]     

Theoretical Analysis of the Solidification of Aluminum Alloy Billet in Air-Slip DC Mold

Based on the heat transfer analysis of Air-Slip DC mold, a numerical model was presented to study the quantitative relationships between critical solidification layer and casting rate, pouring temperature and mold cooling ability etc. The analytical results show that the Air-Slip mold heat transfer condition plays important roles on choices of a casting rate and the pouring temperature, and that the product of billet diameter and casting rate is a certain constant under a certain condition of the mold.