Ultrasonic thin-walled tube wave structure for sensing devices

Theoretical and experimental investigations of thin-walled tube acoustic wave devices for gravimetric sensing applications are presented. Integrated sensor configurations have been demonstrated by employing a sol-gel processed thin piezoelectric lead zirconate titanate (PZT) film. This was coated coaxially on stainless steel tubes and interdigital transducers (IDT) fabricated as the transmitter and receiver on the curved tube surfaces. We have observed tube waves along both the axial and circumferential directions between 1 and 6.6 MHz. We have also analyzed the mass sensitivities of different modes propagating along the tubes and shown that high mass sensitivity can be achieved by keeping the tube wall thin     

扎实推进规划工作 培植绿色发展理念——湖北省中小河流水能资源开发规划工作情况介绍

本文介绍了湖北省中小河流水能资源开发规划工作进展,规划工作在树立绿色发展理念、摸清水能资源开发状况等方面取得的成效,以及湖北省为推动规划工作采取的主要做法。     

Trust-based group services selection in web-based service-oriented environments

Multi-agent technologies have been widely employed for the development of web-based systems, including web-based e-markets, web-based grid computing, e-governments and service-oriented software systems. In these service-oriented systems, service provider agents and service consumer agents are autonomous and rational entities, which can enter and leave the environments freely. For simplicity, we use terms ‘provider’ and ‘consumer’ to represent this two types of agents. How to select the most suitable service providers according to a service request from a consumer in such an open environment is a very challenging issue. In this paper, we propose an innovative trust model, called the GTrust model, for service group selection in general service-oriented environments. In the GTrust model, the trust evaluation for a service group is based on the functionality coverage of the group, the dependency relationships among individual services in the group, the ratings of individual services on the attributes of the service request and a similarity measurement of the extent to which reference reports can reflect the service request in terms of the priority distribution of attributes. The experimental results and analysis demonstrate the good performance of the GTrust model on the service group selection in service-oriented environments.     

呼兰河流域2012年洪水特性分析

对2012年呼兰河流域的暴雨、洪水特性进行了分析,说明了变化规律,认识该流域水文特性,并对其成因及特性进行了归纳,为流域综合治理等提供科学的决策依据,其形成洪水主要是7月25—26日和7月28—29日的两次范围广、强度大的降雨过程。8月4日凌晨呼兰河秦家站出现洪峰,洪峰流量达到1 090 m3/s为2005年迁站以来第一位洪水。     

基于遗传算法的落差指数法参数优选

利用遗传算法的全局寻优能力，对落差指数法中的参数进行优化，通过实例分析表明，这种方法是可行的，且能弥补传统作法中的不足，值得推广。     

折射法对溶液中分子络合物的研究(一)

本文将近期发展起来的研究溶液中分子络合物的折射法用于氯苯-苯酚体系。以侵入式折射仪测定了该体系在惰性溶剂四氯化碳中的络合常数,并对R.A.Singh等的论文中关于△n~2的求算问题进行了商榷。     

A novel de-rusting method with molten salt precleaning and laser cleaning for the recycling of steel parts

Clean Technologies and Environmental Policy - Steel parts are a kind of high recovery value product for which de-rusting is the primary step in the recycling process. Laser cleaning is a popular...     

锚杆锚索联合支护在大断面巷道中的应用

分析了沈阳煤业集团西马煤矿北二区的地质条件,根据生产实际对北二区回风上山掘进工作面的支护选择锚杆锚索联合支护方式,确保了大断面巷道支护的安全。