90°分束偏光镜光强分束比研究

给出了90°分束偏光镜的e,o光光强分束比的计算公式,以及光强分束比随光波长的变化曲线;在6328Å测得的光强分束比与计算值是一致的。     

Passively Q-switched solid-state lasers with intracavity opticalparametric oscillators

A rate-equation-based model that describes the behavior of a passively Q-switched solid-state laser containing an intracavity optical parametric oscillator (OPO) is developed. In such a laser there is no output at the fundamental or pump wavelength. When the OPO signal field begins to build up, it acts as a loss for the pump and thus cavity dumps the pump resonator. The model developed explains this behavior and enables one to select OPO parameters which optimize the system's performance. Application of the model to a compact, lightweight, eye-safe, laser range finder operating at 1.54 μm is also described     

化纤项目后评价启示

介绍国内两个“九五”期间建设的大型化纤项目及其后评价结果，分析了项目达不到预期目标的原因。通过后评价的启示，提出了强化投资项目前期工作以及实施过程中跟踪调整的建议。     

Ornithine decarboxylase transformation of NIH/3T3 cells is mediated by altered epidermal growth factor receptor activity

Ornithine decarboxylase (ODC) has been shown to be oncogenic in transfected NIH/3T3 cells overexpressing the enzyme from a heterologous promoter. These cells, designated as NODC-2 cells, acquire proliferative properties associated with tumorigenic transformation such as loss of contact inhibition, decreased population doubling time, anchorage-independent growth, and tumor production in nude mice. At least one of these parameters, loss of contact inhibition, remains dependent on elevated ODC levels. We have used these cells to investigate the molecular mechanisms by which ODC overexpression drives cell transformation and to examine the involvement of other proto-oncogene products in this process. An interaction between ODC overexpression and the epidermal growth factor receptor (EGF-R) was suggested initially by the elevation of both basal (300%) and ligand-induced (457%) EGF-R tyrosine kinase activities in NODC-2 cells compared to similarly treated control NLK cells. Disruption of EGF-R mediated signal transduction in NODC-2 cells both by treatment with tyrphostin-25 or by transfection with a vector expressing a dominant negative EGF-R mutant resulted in reacquisition of contact-inhibited growth and suppression of anchorage-independent, clonogenic growth in soft agar. We conclude that ODC-induced transformation of NIH/3T3 cells is mediated, at least partly, by alterations in EGF-R signal transduction activity.     

线性复合片补偿器

本文给出一种特殊复合延迟片——复合片补偿器。改变入射线偏振光的振动方位角,便可改变补偿器的延迟量,调整简单,精度高。     

Corrosion Behavior of a Sputtered K38G Nanocrystalline Coating with a Solid NaCl Deposit in Wet Oxygen at 600 to 700°C

A nanocrystalline coating of K38G alloy was obtained by means of magnetron sputtering. The corrosion behavior of cast K38G alloy and its sputtered nanocrystalline coating with a solid NaCl deposit in dry air or wet oxygen at 600 and 700°C have been studied and compared. The results indicated that the mass gain of the coating is higher than that of the cast alloy at 600 and 700°C. Therefore, nanocrystallization reduced the corrosion resistance at these temperatures. Furthermore, the mass gains of the coating and the cast alloy with a NaCl deposit in wet oxygen were less than that with a NaCl deposit in dry air. The relevant corrosion mechanisms are discussed.     

无线局域网中基于RC4的加密算法的分析与改进

分析RC4加密算法自身的缺陷和无线局域网WEP协议对RC4的误用,介绍了TKIP协议在安全性方面的改进。     

基于数字图像分析的薄板成形应变场测量方法

对薄板成形应变场传统的测量方法进行了研究。指出了其不足和误差的来源，提出了数字图像分析法测量薄板成形中的应变场，对测量原理，新的测量方法对传统方法的改进，以及如何降低误差进行了介绍，指出数字图像分析法的前景，提出了改进意见。     

多功能DBHTV传输短节的设计与开发

简要介绍了多功能井下超声成像测井仪的总体构思，然后较详细地阐述了其中的一个关键部分-传输短节的设计与开发过程。在短节中应用了单片机系统和FPGA技术，实现了一种包括大数据量井下超声成像测井仪在组合测井新方法，为今后井下超声成像测井仪的发展拓宽了道路。     

新型可调剪切差平行分束偏光器设计

本文给出了一种新型可调的切差平行分束偏光器设计。它调节方便,可获得较大平行分束剪切差,并可一镜多用