The transient to steady-state transition during the spray-rolling process

From the geometrical standpoint, this article presents a qualitative theoretical analysis and prediction of the transient to steady-state transition during the spray-rolling process, a novel manufacturing technique for aluminum strips. The analytical results indicate that, when the deposited materials at the specific points on one roll surface overlap their counterparts on the other roll surface, spray rolling transits from the transient state to the steady state. The specific points are the limiting deposition positions of the atomized droplets on the roll surface initially.     

A dynamic programming method for analysis of bridges under multiple moving loads

A dynamic programming (DP) method is presented for analysis of statically determinate and indeterminate bridges subjected to moving loads such as those specified by the American Association of State Highway and Transportation Officials (AASHTO) specifications. These loads consist of uniform lane loading, two-axle truck loading and two-axle truck plus one-axle semitrailer loading. The solution of the DP problem is based on the use of influence line diagrams and extremum functions. Recurrence formulae have been developed for various types of AASHTO live loads. The procedure presented in this article is quite general and can be applied to any type of structures with linear behaviour and any type of moving loads. Six examples are presented: a simply-supported beam, a simply-supported Pratt truss, an arch bridge, a continuous Pratt truss, a continuous frame and a cable-stayed bridge.     

A frequency-aware and energy-saving strategy based on DVFS for Spark

The Journal of Supercomputing - With the fast growth of big data applications, it has brought about a huge increase in the energy consumption for big data processing in Cloud data centers. In this...     

鼓泡系统在盖板玻璃生产中的应用

高强盖板玻璃由于其优异的耐划伤、抗冲击性能,在手机屏领域广泛应用,但是却由于其难熔化、难澄清的特点,在普通的玻璃窑炉中难以得到优质玻璃液.在浮法玻璃窑炉中应用鼓泡系统,为提高玻璃液的熔化澄清质量提供一个思路.     

带长矩形接管受压圆简体的有限元分析与强度计算

本文运用有限元软件FEPG,建立了带长矩形接管受压圆筒体的三维参数化有限元模型,研究了矩形接管部位的应力分布特点,按照分析设计规范对带长矩形接管受压圆筒体进行了强度评定,并针对应力分布的不合理性提出了结构改进措施。     

氨纶氯水降解及耐氯机理的探讨

应用红外光谱分析方法，对氨纶（ＰＵ纤维）氯水降解及耐氯机理进行了初步的研究。结果表明，ＰＵ浸氯水后，因受活性氯原子的攻击，ＰＵ大分子软链段的碳－碳键发生断裂，形成碳－氯化合物，添加剂加入后，因与ＰＵ大分子的软链段形成螯合物，从而避免了活性氯原子的攻击，有效地保护了软链段，使氨纶耐氯性能明显改善。     

桥梁断面涡激振动气动效应特性识别

为获取桥梁断面涡激共振过程中的气动效应特性,提出一种基于风洞试验的气动效应特性识别方法,首先提出涡振系统总体阻尼及刚度瞬时特性识别方法,在此基础上提出从涡振系统总体阻尼及刚度中分离气动阻尼及气动刚度的方法.以一个开口断面风洞试验数据为例对该方法的准确性进行了验证,并对该断面涡振气动效应特性进行研究.结果表明:识别得到的系统总体阻尼比为零的等高线与结构涡振响应曲线能很好吻合,从而验证了该方法的准确性.在此基础上对涡振过程中作用于结构的气动阻尼及气动刚度特性进行了研究,获得了气动阻尼及刚度随结构振幅和约化风速的变化规律,可为后续理论模型研究提供参考.     

南水北调中线膨胀土边坡变形破坏类型及处理

南水北调中线工程干线有387 km为膨胀土或膨胀岩渠段,施工期间累计发生有一定规模的滑坡超过100处。通过对工程施工期滑坡的大量解剖、变形位移监测、土体水理指标原位观测,揭示膨胀土渠坡变形破坏主要有浅表胀缩型和较深层结构面控制型滑坡破坏两类。采用水泥改性土换填覆盖处理可以有效减少渠坡膨胀土受大气环境改造的作用,采用地面截渗和地下引排措施可以减少水对土体及结构面的不利影响。当坡体存在长大缓倾角结构面或层间软弱带时,为防止沿结构面产生滑动并维持渠坡长期稳定,必须采取结构抗滑措施。     

抢抓水利改革发展机遇促进榆树市经济跨越式发展

《中共中央国务院关于加快水利改革发展的决定》及吉林省委2011年一号文件《关于贯彻〈中共中央国务院关于加快水利发展的决定〉的实施意见》,对水利事业在国计民生中的战略地位、指导思想、