灭火救援现场动态信息实时监测应用研究

介绍了灭火救援现场动态信息采集现状.建立灭火救援现场动态信息实时监测系统,在灭火救援现场以消防车为核心,通过CAN总线、RS 485和RS 232串口等信息采集技术,实现消防车车辆底盘信息、上装信息及车载装备器材使用信息等的实时采集、远程传输及监控管理的功能,论述了系统组成及主要功能.     

实时子结构试验在数值积分和控制方面的研究进展

实时子结构试验方法将数值模拟和实时加载有机结合,能够较准确地研究结构系统的抗震性能,是现阶段结构抗震研究的重要发展方向.目前,实时子结构试验方法处于起步发展阶段,围绕积分方法和试验加载控制两个难题,一些学者相继开展了研究工作.详细介绍这些研究工作的进展,指出其中亟待解决的突出问题,并依此提出合理的研究方向和目标.     

Integrating embedded piezoelectric sensors with continuous wavelet transforms for real-time concrete curing strength monitoring

It is highly necessary to evaluate strength development during the curing process to ensure the quality of concrete in construction using concrete. In particular, curing strength monitoring at early age is very important to reduce the construction cost and time, because it can provide the information required for the decision-making to safely progress to the next process. In this study, a guided wave-based non-destructive curing strength gain monitoring method that can be used even for early-age concrete is proposed. A steel plate-type piezoelectric sensor module was embedded in the concrete media at the same time as concrete placement to measure the signal from early-age concrete. The guided wave signals were measured continuously using the pitch-catch method at regular intervals. The wavelet transform process was performed to improve the quality of the signal. The guided wave's velocity of each measurement time was varied by extracting the time of flight. The wave velocity hysteresis curve according to the curing age was traced to analyse the variation patterns. Finally, a specific equation to estimate the curing strength without destructive test was derived using regression analysis based on the wave velocity hysteresis and the results from the compression test.     

部分液化调峰型LNG生产流程的模拟

介绍一种直接利用高压天然气调压过程中的压力能来膨胀制冷,使部分天然气液化的调峰型LNG生产流程,用HYSYS软件对该流程进行了模拟计算。     

Thermodynamical analysis of dry cooling tower and solar chimney power plant combination

Solar chimney power plant is one of the rather new technologies that can produce power from solar energy. Its high stack is one of the important parts of the system in which the differential density of air among its top and bottom sections causes air-flow. Dry cooling towers are used in industries for cooling condensing water by utilising this concept and generating air-flow. The structural and conceptual similarity between these two systems cause the feasibility of their combination and usage of waste energy in industries. In this article, a simple and useful analytical thermodynamic model is improved in order to estimate the thermodynamic flow properties for combining both systems. Results show that the stack height and diameter are effective parameters in recovery of power. Moreover, the results show that the collector area does not remarkably affect the system performance.     

电子阅览室数字资源建设及技术维护

高职院校图书馆建立电子阅览室是信息技术发展的客观要求,也是广大读者的迫切需要。针对电子阅览室硬件建设、软件安装及数字资源管理几方面,结合工作实际进行探讨与总结。     

军用软件研制过程的质量监督

军用软件的研制必须按产品研制要求进行工程化管理.研制过程的质量监督包括软件开发、评审、验证"三库"管理、设计定型及归档等监督.软件评审监督含软件需求分析和设计评审.设计评审包括概要和详细设计评审、实现阶段和测试评审.软件验证监督含单元、部件和系统测试."三库"管理监督含开发库、受控库和产品库.     

RTD-HBT高速低功耗环形振荡器的分析

RTD与HBT是高频高速器件,共振隧穿二极管-异质结晶体管(RTD-HBT)环形振荡器有很好的应用前景.详细介绍了RTD-HBT高速低功耗环形振荡器的工作原理,建立了RTD,HBT及RTD-HBT环形振荡器的等效电路模型,并对RTD-HBT环形振荡器用Pspice模拟软件进行了电路模拟.模拟结果与预期结果一致,有助于指导该电路的设计.     

动态图水印的堆统计攻击和防范

文章介绍动态图水印在JavaWiz软件和SandMark软件中的实现方法,并进行分析比较,针对在堆统计上暴露的问题,改进了SandMark的动态图水印实现方法.     

高职高专高等数学实验课的实践与探究

浅谈了在高职高专高等数学实验课实践过程中的几点体会,并针对目前我校高等数学实验课的实施情况给出了几点建议.