Design of optical strip-loaded waveguides with zero modalbirefringence

Integrated optic devices are usually sensitive to the polarization state of light, because the two polarized modes of the waveguides that form the devices in general have different propagation constants and may also suffer from different losses. The performance of such devices becomes unstable when they are connected to single-mode fibers, as the polarization state of the output light from a practical fiber link usually fluctuates in an unpredictable manner. A simple solution could be provided by using waveguides in which the two polarized modes are degenerate, i.e., have equal propagation constants. In this paper, it is shown theoretically with the spectral index method that the quasi-transverse electric (TE) and quasi-transverse magnetic (TM) modes of a properly designed optical strip-loaded waveguide can have equal propagation constants. The conditions for achieving mode degeneracy, or zero modal birefringence, are presented and discussed. Strip-loaded waveguides with degenerate polarized modes can be used potentially for forming polarization-insensitive optoelectronic devices     

通用可编程自适应机电产品寿命测试系统

应对各国技术壁垒,我国对各类产品的安规认证及安规测试也日益重视.文章介绍了一种基于单片机系统,驱动气动装置和辅助电动装置,能对多种机电产品进行安规寿命测试的通用可编程自适应测试系统.     

球型旋转锉的最简加工

研究了加工球型特种回转面刀具的最简加工理论,这种前所未有的简单方法,是作者多年潜心研究的结果。它无需数控,也无需对机床作任何实质性改动。     

MIDI to SP MIDI transcoding using phrase stealing

The mobile phone industry has a problem with conversion from MIDI to SP-MIDI, which handles specific polyphonic limits. Simple specific polyphonic reduction algorithms, such as note-stealing, may lose or interrupt important musical information. The authors help resolve the problem with a phrase-stealing algorithm that drops the perceptually least important notes and preserves the most important phrases. Tests show that listeners reacted positively to this solution.     

圈条效应的探讨

通过文字和波谱图描述了圈条效应的产生原因和特征,借助立达专家系统对机械波的分析,指出了判别圈条效应的重要性,并阐述了几种运用电子条干仪判别的方法.     

空冷汽轮机末两级变工况三维流动的数值模拟

采用三维粘性数值模拟方法对变工况下空冷汽轮机末两级流动进行了模拟,研究了效率和脱流高度等重要参数的变化规律,着重分析了设计点和小容积流量工况时的三维流场。通过分析了解了机组在变工况运行时末级流动的特点,为空冷汽轮机末级叫片的设计和优化提供了依据。图8参5     

质谱仪离子导向装置的原理、应用和进展

离子导向装置（ion guide）是传输离子的重要手段。在质谱仪器中,离子导向装置是离子光学（ion optics）系统的重要组成部分,是联络处于低真空（或大气压）电离源和质量分析器的桥梁。离子导向装置不仅用于传输离子,还可降低离子的空间发散度和能量分散度,使离子最大限度到达质量分析器。本工作主要对一些常用的离子导向装置的原理、应用和进展进行了评述,并展望了未来的发展。     

注射液杂质智能灯检机关键模块设计及仿真

针对注射液杂质全自动智能灯检机中检测平台的核心运动单元的设计进行了详细的论述,并详细介绍了灯检机的工作原理。为了采集到准确清晰的注射液杂质图像,对灯检机机械系统中检测平台的关键检测模块进行设计与分析,其主要包括回转组件、夹具组件和同步带轮组件等关键部件。综合应用三维实体造型CAD软件和机械系统动力学分析软件ADAMS建立了所设计的灯检机的虚拟样机,并通过初步运动仿真分析,验证了所设计机构的合理性以及该设计的意义。     

低In电解液电沉积制备CuInSe2吸收层

通过线性电位扫描分析了低In电解液中的阴极电化学反应,结果表明柠檬酸钠可以降低Cu2+的活性,而H2SeO3的加入可导致阴极上Se元素与Cu+和In3+发生复杂的协同反应.低In电解液中恒电位沉积的薄膜与CIS的化学计量比相差较大,分段电位的恒电位沉积得到的薄膜更接近于CuInSe2(CIS)化学计量比.薄膜在N2气氛上退火处理,得到了黄铜矿结构CIS薄膜,禁带宽度为1.06eV.