拉力芯棒在二辊斜轧延伸中的应用

介绍了在二辊斜轧延伸中采用拉力芯棒轧制的新工艺。探讨了拉力芯棒轧制与固定芯棒轧制、浮动芯棒轧制和限动芯棒轧制相比所显示的优越性。实践表明，采用拉力芯棒轧制方式，可以轧制薄壁管，提高产品尺寸精度和内表面质量。     

Subpixel accuracy for extracting groove center based on corner detection

0IntroductionWelds quality is directly affected by the location accu-racy of welding torch to groove center in vision sensor robotwelding. Therefore, it is very significant to increase theextraction accuracy of groove center. A common method isto use high resolution CCD and high speed image collectingcard, but it costs high or sometimes there are limits inuse.Subpixel detection is an effective soft method to in-crease image location accuracy[1 -2]. Compared with chan-ging hardwares , it is v…     

REST在异构移动客户端接入中的应用研究

针对繁多异构的移动客户端接入Web应用系统的问题,提出一个基于REST(Representational State Transfer)的解决方法并给出一个基于MVC(Model-View-Controller)模式的具体的开发框架,通过RESTful Web服务连接移动客户端的View/Controller层与Web系统的Model层。定义了由Web系统的model层定义RESTful Web服务的具体方法和规则。理论分析与实际应用说明了该方法的有效性。     

地磁辅助惯性组合导航技术分析

从地磁导航的特点出发,指出了地磁／惯性组合导航在未来发展中的优势,并对实现该种组合导航需要的技术手段做了全面的分析,包括：信息融合策略、高精度地磁场模型的构建方式以及滤波算法的设计。同时,阐述了其中的改进方向,为进一步提高该种组合导航性能提供思路。     

物探工程系统设计与实现

系统以地震勘探科研、生产、管理为主线,构建满足实际地震勘探需要的多级(油公司、勘探部、勘探分公司、研究院、物探公司、科室、项目组)生产、管理应用流程,实现地震勘探工作的网络化、标准化管理。     

基于CPLD的ГОСТ18977总线发送卡设计

针对某型俄制机载产品的测试需求,提出了一种ГОСТ18977总线发送卡的设计方法;介绍了ГОСТ18977总线标准和80C196KB单片机、EPM7128LC可编程逻辑器件的使用方法,并利用外围电路和上述芯片设计并实现ГОСТ18977总线发送卡,介绍了并口EPP模式下ГОСТ18977总线数据的控制过程,给出了ГОСТ18977总线发送卡的部分设计电路,并阐述了它的设计原理;实践验证了该板卡能够完成ГОСТ18977总线数据信息格式转换和传输,完全可以满足对某型俄制机载产品性能检测的要求。     

Dynamic Multiple-Fault Diagnosis With Imperfect Tests

In this paper, we consider a model for the dynamic multiple-fault diagnosis (DMFD) problem arising in online monitoring of complex systems and present a solution. This problem involves real-time inference of the most likely set of faults and their time-evolution based on blocks of unreliable test outcomes over time. In the DMFD problem, there is a finite set of mutually independent fault states, and a finite set of sensors (tests) is used to monitor their status. We model the dependence of test outcomes on the fault states via the traditional D-matrix (fault dictionary). The tests are imperfect in the sense that they can have missed detections, false alarms, or may be available asynchronously. Based on the imperfect observations over time, the problem is to identify the most likely evolution of fault states over time. The DMFD problem is an intractable NP-hard combinatorial optimization problem. Consequently, we decompose the DMFD problem into a series of decoupled subproblems, one for each sample epoch. For a single-epoch MFD, we develop a fast and high-quality deterministic simulated annealing method. Based on the sequential inferences, a local search-and-update scheme is applied to further improve the solution. Finally, we discuss how the method can be extended to dependent faults.     

基于CPLD的ГOCT18977总线发送卡设计

针对某型俄制机载产品的测试需求,提出了一种ГOCT18977总线发送卡的设计方法介绍了ГOCT18977总线标准和80C196KB单片机、EPM7128LC可编程逻辑器件的使用方法,并利用外围电路和上述芯片设计并实现ГOCT18977总线发送卡,介绍了并口EPP模式下ГOCT18977总线数据的控制过程,给出了ГOCT18977总线发送卡的部分设计电路,并阐述了它的设计原理;实践验证了该板卡能够完成ГOCT18977总线数据信息格式转换和传输,完全可以满足对某型俄制机载产品性能检测的要求.     

Diversity in Addressing Reaction Mechanisms of Nano‐Thermite Composites with a Layer by Layer Structure

The reaction mechanisms and microstructures of various layered nano‐thermite composites are investigated through characterization of their energetic properties. Migration of reactive components across the reaction zone is analyzed, which plays an important role in determining the process initiation, reaction propagation, and chemical stability at low temperatures. Distinct types of nanoparticles are deposited onto filter paper in a sequence, using the vacuum filtration method, which promotes intimate contact between neighboring reactive layers. Scanning Electron Microscopy (SEM) images demonstrate a well‐defined contact region between the two layers in the Al/CuO or Al/NiO composites. Differential Scanning Calorimetry (DSC) data shows that the thermite reaction occurs below the melting temperature of Al, resulting in rapid heat release, and improves reaction initiation. Elemental mapping results reveal the migration of Al, Ni/Cu, and oxygen before and after the thermite reaction, which is arranged during thermogravimetric analysis (TGA). This analysis indicates the dominant pathway of the thermite reaction in each composite, through either decomposition of the CuO nanoparticles in the Al/CuO composite or through direct migration of reactive components across the conducting surface within the Al/NiO composite.

     

Interaction of {112¯2} twin variants in hexagonal close-packed titanium

As multiple {11$\overline{2}$ 2} twin variants are often formed during deformation in hexagonal close-packed (hcp) titanium, the twin-twin interaction structure has a profound influence on mechanical properties. In this paper, the twin-twin interaction structures of the {11$\overline{2}$2} contraction twin in cold-rolled commercial purity titanium were studied by using electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). Formation of the {11$\overline{2}$2} twin variants was found to deviate the rank of Schmid factor, and the non-Schmid behavior was explained by the high-angle grain boundary nucleation mechanism. All the observed twin-twin pairs manifested a quilted-looking structure, which consists of the incoming twins being arrested by the obstacle twins. Furthermore, the quilted-looking {11$\overline{2}$2} twin-twin boundary was revealed by TEM and high resolution TEM observations. De-twinning, lattice rotation and curved twin boundary were observed in the obstacle twin due to the twin-twin reaction with the impinging twin. A twin-twin interaction mechanism for the {11$\overline{2}$2} twin variants was proposed in terms of the dislocation dissociation, which will enrich the understanding for the propagation of twins and twinning-induced hardening in hcp metals and alloys.