Rayleigh-Type Wave in A Rotated Piezoelectric Crystal Imperfectly Bonded on a Dielectric Substrate

Propagation characteristics of Rayleigh-type wave in a piezoelectric layered system are theoretically investigated. The piezoelectric layer is considered as a cubic crystal with finite thickness rotated about Y-axis and is imperfectly bonded onto a semi-infinite dielectric substrate. The imperfect interface between the two constituents is assumed to be mechanically compliant and dielectrically weakly conducting. The exact dispersion relations for electrically open or shorted boundary conditions are obtained. The numerical results show that the phase velocity of Rayleigh-type wave is symmetric with respect to the cut orientation of 45。 and can achieve the maximum propagation speed in this orientation. The mechanical imperfection plays an important role in the dispersion relations, further the normal imperfection can produce a significant reduction of phase velocity comparing with the tangential imperfection. Comparing with the mechanical imperfection the electrical imperfection makes a relatively small reduction of phase velocity of Rayleigh-type wave. The obtained results can provide some fundamentals for understanding of piezoelectric semiconductor and for design and application of piezoelectric surface acoustic wave devices.     

RFRL30型剑杆织机用于丝织物织造的工艺调试探究

RFRL30型剑杆织机是一款高性能织造设备,已经广泛应用于各种复杂服装面料、装饰布、滤布、安全织物等领域。近年来,越来越多的客户也在使用RFRL30型剑杆织机织造丝织物,为了提高织机运转效率、提升面料质量,针对丝织物的纱线特点和面料要求,文章探究了RFRL30型剑杆织机生产丝织物过程中织机工艺参数的调节及注意事项;针对特殊品种的织造,通过反复试验织机的调试工艺参数,找到了最佳状态,满足了客户需求。     

A data‐centric framework for debugging highly parallel applications

Contemporary parallel debuggers allow users to control more than one processing thread while supporting the same examination and visualisation operations of that of sequential debuggers. This approach restricts the use of parallel debuggers when it comes to large scale scientific applications run across hundreds of thousands compute cores. First, manually observing the runtime data to detect error becomes impractical because the data is too big. Second, performing expensive but useful debugging operations becomes infeasible as the computational codes become more complex, involving larger data structures, and as the machines become larger. This study explores the idea of a data‐centric debugging approach, which could be used to make parallel debuggers more powerful. It discusses the use of ad hoc debug‐time assertions that allow a user to reason about the state of a parallel computation. These assertions support the verification and validation of program state at runtime as a whole rather than focusing on that of only a single process state. Furthermore, the debugger's performance can be improved by exploiting the underlying parallel platform because the available compute cores can execute parallel debugging functions, while a program is idling at a breakpoint. We demonstrate the system with several case studies and evaluate the performance of the tool on a 20 000 cores Cray XE6. Copyright © 2013 John Wiley & Sons, Ltd.     

湿法脱硫废水的处理与调试

简述了湿法烟气脱硫废水的特性、处理原理及调试方法;对石灰石-石膏湿法脱硫废水的形成以及各种污染物做了详细分析,并就废水在各反应池的停留时间、投药量、污泥的排放控制等主要因素对处理效果的影响、及工艺控制过程和最终处理结果进行了讨论。经工艺调试后,脱硫废水处理系统目前已正常投入并运行稳定,各项排放指标均符合标准要求。     

异型材挤出模具的订购与调试

介绍了塑料型材挤出模具的订购及调试,着重叙述了模具订购时应注意的技术细节和模具调试及验收的注 意事项。     

冷弯型门式刚架结构极限承载力有限元分析

对冷弯型门式刚架结构在竖向荷载作用下的变形、极限承载力和破坏特征进行了分析,并验证了该方法的正确性和可靠性,考察了改变节点板尺寸参数对冷弯型门式刚架竖向承载力和刚度的影响,结果表明合理增大节点板尺寸可以有效提高刚架的竖向承载力和刚度。     

简析中央空调调试中的若干问题及对策

首先简单介绍了中央空调的调试过程,之后列举了调试过程中常见的系统漏水、堵塞、噪声过大、结露等问题,并分析了这些现象的主要原因,针对性地提出了解决的对策,具有一定的参考价值。     

沥青混凝土拌合楼生产配合比调试技术

由拌合楼工作原理出发，通过对沥青混凝土拌和中常见问题的分析，详细说明了生产配合比拌合楼的调试技术，提出了预防措施，加快了生产配合比拌合楼的调试，提高了沥青混凝土的拌合质量，降低了工程成本。     

南京地铁中胜站明挖基坑降水设计与施工

针对南京地铁中胜站典型的二元化地质概化模型,分析承压不完整井在非稳定流和干扰状况下的工作机理,提出了一套相对完善的计算设计方法,计算结果与施工监测结果基本吻合。该方法可为类似工程的设计和施工提供参考。     

CAST工艺的低温活性污泥培养与调试运行

以长春市双阳污水处理厂为例,介绍了CAST工艺在冬季低温条件下活性污泥培养与调试运行的控制方法.针对运行管理过程中存在的问题,提出了有效的解决措施.