焊接冷裂纹临界冷却时间判据建立

用平板刚性拘束裂纹试验（ＰＲＲＣ）研究了４种国产低合金高强钢焊接冷裂敏感性，探讨了焊接接头扩散氢含量、焊接线能量、局部预热温度、拘束度的大小及局部预热产生附加应力等对钢材冷裂纹敏感性的影响。建立了国产低合金高强钢的临界冷却时间判据ｔｃｒ。实验表明此判据可靠，可用于评定现行焊接工艺条件下是否产生冷裂纹及确定合理的焊接工艺。     

气雾冷却在薄板坯连铸机中的应用

根据薄板坯连铸机的工艺特点,重点介绍了气雾冷却在薄板铸机中的应用,及其实现方式、使用效果。     

溶气气浮法处理炼油循环水排污水研究

为了确定混凝气浮法处理炼油循环水排污水的可行性,在几种常用混凝剂中通过试验选定无机混凝剂PAC,配合有机PAM使用,再通过正交试验确定混凝剂的最佳使用条件,在此条件下通过试验确定混凝沉淀法的效果,最后用混凝——气浮法处理炼油循环水旁滤反冲水,结果表明使用混凝——气浮法处理这种废水并回用可以满足要求且有明显优势。     

The 2001 Nobel Prize in Physics

This year’s Nobel Prize in Physics has been jointly awarded to Eric A Cornell of the National Institute of Standards and Technology, Boulder (USA), Wolfgang Ketterle of the Massachusetts Institute of Technology, Cambridge (USA), and Carl E Wieman of the University of Colorado, Boulder (USA). They have been cited “for the achievement of Bose-Einstein condensation in dilute gases of alkali atoms, and for early fundamental studies of the properties of the condensates”. The scientists have been recognized for their pioneering work in a field that has grown explosively around the world in the past few years. Though the phenomenon of Bose-Einstein condensation (BEC) was predicted by Einstein in 1925 (based on the new statistics of Bose), it was observed only in 1995. In this article, we review the basic physics behind the phenomenon, the experimental techniques involved in achieving it, and high-light some of the potential applications of condensates.     

低pH漂移腐蚀事故及处理对策

随着全球工业的发展 ,冷却水的用户日益增多 ,冷却水系统中金属腐蚀与防护问题正在引起人们的重视 .低pH漂移引起的腐蚀就是其中之一 .     

Three dimensional free convection couette flow with transpiration cooling

INTRODUCTION In recent years, the subject of free convection flow has attracted the attention of a number of scholars because of its possible applications to several geophysical problems. In view of these applications, a series of investigations were made to study the flow past a vertical wall. Transpiration cooling can very effectively pro-tect certain structural elements in turbojet and rocket engines, like combustion chamber walls, exhaust nozzles or gas turbine blades from hot gases. …     

20 MnSi热轧螺纹钢筋性能的提高

对目前我国钢铁企业提高螺纹钢筋性能的几种生产方法进行了分析、比较，并从理论和实践出发对螺纹钢筋性能的提高提出一些更经济可行的观点。     

除湿制冷用优良吸附剂的特性研究

对自制吸附剂 (DH 5 0 ,DH 70 ) ,硅胶和 13x的除湿制冷性能进行了实验研究 .测定了DH 5和DH 7吸附剂的吸附等温线 ;对DH 5 ,DH 7,硅胶和 13x用于除湿制冷过程的动态特性进行了研究 ;讨论了吸附量、空气湿度、再生温度和单位质量吸附剂的制冷量对固体除湿过程的影响 .结果表明 :DH 5和DH 7的除湿制冷性能明显优于常规吸附剂 (硅胶和 13x) .DH 5和DH 7吸附剂的最大平衡吸附量分别为 0 .72kg/kg和 0 .73kg/kg ;在 10 0℃条件下再生 ,DH 7吸附剂的除湿制冷量是硅胶的 2 .2倍 ,单位质量吸附剂的制冷量是硅胶 1.9倍 ;在较高再生温度(2 0 0～ 2 5 0℃ )下 ,DH 5吸附剂的除湿制冷量是 13x的 1.3倍 ,单位质量DH 7吸附剂的制冷功率是 13x的 2 .2倍 .     

椭圆翅片管空冷器在乙烯工业中的应用

通过对圆形翅片管和椭圆翅片管的性能分析比较，选取椭圆翅片管对乙烯工业中的圆形翅片管空冷器进行设计改造，达到提高传热效率、降低流动阻力，节能降耗、提高效益目的。根据改造的结果以及在实际中应用，采用椭圆翅片管空冷器在压缩气体的冷却上各项参数均优于原圆管翅片管空冷器，达到了要求。证明椭圆翅片管空冷器在乙烯工业中有很好的应用价值，在其它类似的场合中也值得应用推广。     

Exertional Heat Stroke of Max Gilpin; A Preventable Death

ABSTRACT

Exertional heat stroke (EHS) is a medical emergency whose likelihood in sport settings is often contingent on environmental factors, team policies, coaching strategies, and broader cultural expectations. Moreover, when it occurs, it requires immediate recognition, proper management, and care to optimize chances of survival or recovery without long-term sequelae. Max Gilpin, a secondary school American football player from Louisville, Kentucky, suffered an EHS during a football practice in August 2008, an event that resulted in his death. The purpose of this article is to use interdisciplinary methods to identify key factors that contributed to this tragedy so that similar situations do not happen again. It concludes that within a culture of inclusive gender norms and care, efforts should be made to have appropriate onsite medical expertise available to develop and implement best practices for the prevention, management, and treatment of EHS, along with coaching education specific to medical emergencies in sport and physical activity (such as EHS). This will create an environment that promotes health and safety for all student athletes participating in sport at the secondary school level.