Pulse propagation in superconducting coplanar striplines

The phenomenological loss equivalence method (PEM), the enhanced two-fluid model for thin-film superconducting materials, and the dynamical calculation of radiation losses in planar structures are used-in the context of a linear filter approach-to model attenuation and dispersion of ultrafast pulses in coplanar striplines. The numerical simulation of this modeling shows excellent agreement with experimental results available in the literature. Simple relationships between the peak attenuation and delay time of the propagation pulse, and penetration depth at absolute zero and conductivity at critical temperature may open the possibility of using pulse distortion to characterize thin-film, high-temperature superconducting materials     

几种常用滤波器的特性

对几种滤波器的原理、特性和应用进行了研究比较 ,并特别介绍了目前的研究热点 :各种光纤光栅滤波器及集成阵列波导滤波器等。如今滤波器的蓬勃发展表明 ,它将在未来的光通信系统中发挥越来越重要的作用。     

油田高压蒸汽管线缺陷原因分析

2001年在对克拉玛依油田高压蒸汽管线进行检验中发现许多严重超标缺陷,针对所发现的缺陷进行分析研究,指出缺陷形成的原因,提出今后在高压管线的检验、设计、安装和使用中应注意的事项。     

沥青加铺层改造机场旧水泥跑道防裂措施试验研究

机场旧水泥混凝土跑道采用沥青加铺层改造，是解决老机场跑道损坏问题的有效途径，但如何延缓与防治反射裂缝是突出的问题，为此，利用大型反射裂缝试验设备在室内进行足尺板试验，研究分析了几种常用防裂层抗反射裂缝的能力，以寻求最佳的防裂措施，为沥青加铺层的设计与施工提供依据。     

纤维增强塑料/钢筋混凝土复合构件的侧向变形效应

本文对FRP包覆RC复合构件的侧向变形效应进行初步探讨,为实验研究和工程FRP铺层设计提供一种参考.     

气枪震源的发展与使用分析(上)

本文从气枪震源的发展入手,对各类气枪的性能、参数和工作原理进行了分析比较,列出了各类气枪的常用阵列。分析出了影响气枪参数的因素,并给出了气枪充气时间的计算方法及气枪阵列的设计方法。     

Synthesis and glycosidic coupling reaction of substituted 2,6-dioxabicyclo[3.1.0]hexanes: 1,2-anhydro-3,5-di-O-benzyl-alpha-D-ribofuranose

Electron microscopy of the central nervous system surface structure is described in two fetuses with Fukuyama congenital muscular dystrophy (FCMD). In addition to relatively large surface defects, many minute defects less than several micrometers in size associated with protrusion of glial cytoplasm were observed in the cerebrum. These findings were considered to represent early changes prior to cortical dysplasia. The basement membrane adjacent to the defects showed amorphous, wavy, or whorled configurations, and gradually disappeared. The glial cytoplasmic membrane seemed to be relatively well preserved in some areas where the basement membrane disappeared. On the other hand, both the basement membrane and cytoplasmic membrane became indistinct irregularly in areas without defects, including the spinal cord; similar lesions were found in the skeletal muscle. These observations confirm previous observations concerning defects of the pial-glial barrier of the brain surface, and may suggest the involvement of abnormal basement membrane or related structures, or both, in the genesis of the brain lesions of FCMD.     

一种新型红外遥测板形检测仪

介绍了一种新型的红外遥测板形检测仪的结构及其工作原理，给出了该仪器的主要技术指标。     

关于各种弹性地基模型上的结构分析

地基模型一般可分为:(1)Winkler 模型,(2)Boussinesq 半无限体模型,(3)成层模型,(4)双参数模型,(5)各种非弹性(如粘性、塑性)模型等。(1)～(4)属于弹性地基模型.本文首先分析了各种弹性地基模型,然后综述了近年来国内外发表的有关置于各种弹性地基模型上的结构分析方面的成果,文中也包括作者自己尚未发表的部分成果。