相位推算法瞬时测频研究

相位推算法瞬时测频是基于数字接收机的计算方法。本文介绍了该算法的原理,分析、仿真了其误差,给出了校码处理原则,并进行了技术验证。结果表明,该算法具有测频精度高、瞬时性好的优点。     

多摄像机图像间的稳定切换控制

为获得连续动态的图像雅可比矩阵,分析了融合方式和传统图像直接切换方法的缺陷,提出了一种基于融合的多图像稳定切换算法,算法采用动态加权融合策略。在移动机器人位置未知和无标定多摄像机的情况下,仿真和实验结果表明:该算法比传统方法具有更高的适应能力,图像切换过程的稳定性得到了很大提高。     

即开票用水性油墨刮开性能影响因素研究

目的 制备性能优异的即开型彩票专用柔性版水性油墨,研究影响油墨刮开性的因素。方法 分别改变油墨配方中树脂的种类,润湿剂的种类、配比,以及乳液的种类及配比,以配制油墨,并测试油墨在隔离油上的刮开性能。探究即开票用水性油墨刮开性的影响因素。结果 选用研磨树脂Joncryl 678,油墨的刮开性能较好;润湿剂选用TEGO wet245,其质量分数为4%时,能够使油墨在正常上墨的前提下,保证较好的综合刮开性能;选用Neocryl A-1120,其质量分数为50%时,刮开层能被有效刮开,且票样老化后能够正常刮开;综合考虑各因素之间的相互作用,选择润湿剂245的质量分数为4%,乳液A-1120的质量分数为50%时,油墨的综合刮开性能最优。结论 油墨配方中的研磨树脂对油墨的刮开性有一定影响。润湿剂种类和含量对刮开墨的刮开性影响较大。其中润湿剂还影响油墨在UV光油打底样张上的上墨情况,鉴于即开票的特殊性,需对遮盖性和刮开性进行综合考量,最终合理选择和添加润湿剂。乳液在油墨配方中对墨层的刮开性起着决定性的作用。润湿剂种类与乳液种类,润湿剂含量与乳液含量间的交互作用对油墨刮开性的影响较大,在评价油墨刮开性的影响因素时,需考虑各组分的交互作用。     

利用光导开关产生瞬态电脉冲研究

介绍了利用高阻特性的GaAsI、nP:Fe材料研制光导开关的方法,并得出光导开关在产生低功率皮秒电脉冲、高功率纳秒电脉冲及产生电脉冲的稳定性与输入、输出电压比等性能参数测试的实验结果。最后,介绍了光导开关处于线性与非线性临界状态下的几个重要实验新现象。     

The Role of Test Protocols in Automated Test Generation for Embedded-Core-Based System ICs

Modular testing is an attractive approach to testing large system ICs, especially if they are built from pre-designed reusable embedded cores. This paper describes an automated modular test development approach. The basis of this approach is that a core or module test is dissected into a test protocol and a test pattern list. A test protocol describes in detail how to apply one test pattern to the core, while abstracting from the specific test pattern stimulus and response values. Subsequent automation tasks, such as the expansion from core-level tests to system-chip-level tests and test scheduling, all work on test protocols, thereby greatly reducing the amount of compute time and data involved. Finally, an SOC-level test is assembled from the expanded and scheduled test protocols and the (so far untouched) test patterns. This paper describes and formalizes the notion of test protocols and the algorithms for test protocol expansion and scheduling. A running example is featured throughout the paper. We also elaborate on the industrial usage of the concepts described.     

基于P2P的即时通信系统的设计

为了有效解决传统即时通信系统的安全问题,减轻集中式服务器的负担,采用基于P2P的底层网络机制来实现即时通信系统。与其他方法相比,其节约了成本,增强了系统的可扩展性和健壮性。从最终的测试结果来看,基本上实现了该系统的预期开发目标,完成了基本的P2P的底层实现机制和即时通信系统的基本功能。     

超滤法纯化甜荞麦麸皮中黄酮类化合物研究

采用Labscale TFF System对甜荞麦麸皮黄酮粗提液进行纯化,通过对3种不同分子截流量Pellicon XL Filter超滤膜进行比较,选择分子截流量为10,000超滤膜;并研究其在不同样液浓度、样液温度和操作压力下对膜通量,黄酮迁移率和黄酮纯度影响,确定最佳工艺条件。结果表明,分子截流量为10,000超滤膜在样液浓度为0.5 mg/mL、样液温度为30℃、操作压力为2bar条件下,初始膜通量为0.272 ml/cm2.min、黄酮迁移率为91.95%、纯度达28.59%。     

The influence of plastic properties on chip formation

A two-dimensional finite-element model of the chip formation process is used to study the influence of the material law determining plastic flow on chip formation of titanium alloys at high cutting speeds. For simplicity, friction and thermo-mechanical properties of the tool are neglected in the simulations. Titanium chips are strongly segmented and therefore especially suitable to study the role of segmentation for the cutting force and other cutting parameters. Of special interest is the influence of the thermal softening parameter in the material law. Increasing thermal softening leads to a drastic decrease in the cutting force and a corresponding increase in chip segmentation. A variation of the hardening exponent is also performed. It is shown that the simulation results can be understood by using adiabatic flow stress curves. The variation of the hardening exponent leads to strongly differing chip shapes, although the cutting force stays nearly constant. This shows that mean cutting forces should not be used as simulation verification parameters.     

基于蓝牙的智能终端数据传输系统的应用研究

针对物联网系统中智能终端之间数据传输的要求以及智能设备存在的交流、计算等问题,将蓝牙技术引入数 据传输过程,提出了基于蓝牙技术的智能终端数据传输系统。采用CC2540 芯片实现终端设备之间的蓝牙低功耗传输,并分 析了基于Android 系统的终端蓝牙传输过程,研究了基于蓝牙的智能终端设备与智能手机之间无线数据传输原理,实现了数据 在智能终端设备之间的交互,为提高物联网数据传输能力及速度提供了新思路。