20号合成烃航空润滑油应用的研究

对20号合成烃航空润滑油的使用性能，包括粘温性、氧化安定性、金属腐蚀性、金属磨损性以及高空起泡性等进行了研究，表明20号合成烃航空润滑油具有良好的使用性能，聚α-烯烃生产航空润滑油是合理的工艺路线。     

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本文介绍了运用地表岩石吸附烃法指示四川浅层油气藏,发现吸附烃异常与油气井产能有良好吻合性,反映了地下裂缝系统和油气聚集的分布。并对实验条件、各种可能的影响因素及一些基础理论问题进行了实验分析和讨论。     

烃类在三甘醇和四甘醇中无限稀释活度系数的测定与关联

用气相色谱法分别测定了苯、甲苯、乙苯、正庚烷、正辛烷、正壬烷和正癸烷在三甘醇和四甘醇中的无限稀释活度系数 ,测定温度范围为 5 0～ 13 0℃。用修正的UNIFAC模型 (Dortmund)对上述不同温度下的无限稀释活度系数实验数据进行关联 ,得到了三甘醇和四甘醇与其它基团的相互作用参数 ,并将计算结果与实测值进行了比较。     

A vibrating-tube densimeter for fluids at high pressures and temperatures

A vibrating U-tube apparatus has been developed for determining the densities of pure fluids and fluid mixtures at 10-200 MPa and 323-773 K. Measured parameters areP,T, andr (period of vibration). Fluids are injected into the U-tube at constantP andT. Three or more reference fluids are used to calibrate the response of the instrument. Fluid mixtures are produced by pumping pure fluids into T-junctions on the upstream side of the U-tube using high accuracy syringe pumps. An automated syringe pump is used to maintainP at setpoint ±0.01 MPa.T is controlled to ±0.01 K using a closed-loop, electronic signal amplification/feedback system. For mixtures, a statistically significant number of measurements of r are obtained to account for the effects of small heterogeneities in fluid composition (generally <0.005X;). Typically, density data for 15 fluids can be obtained in a 6- to 8-h period. Considering all of the potential sources of error in the experimentation, conservative estimates of uncertainty are as follows:P, ±0.02 MPa;T, ±0.05 K;p (pure fluids), ±0.0005g.cm^–3; andp (fluid mixtures), ±0.0005-0.0010g-cm^–3.Paper presented at the Twelfth Symposium on Thermophysical Properties, June 19–24, 1994, Boulder, Colorado, U.S.A.     

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吐哈油田在总结国内成功经验的基础上，立足先进适用，配套可靠，相继在鄯善、温米、丘陵三大油田建成了鄯善１０＃、鄯善３０＃、温米５０＃、丘陵１２０＃轻烃回收装置，形成了２１０×１０４ｍ３／ｄ的处理规模。根据吐哈油田天然气的物理性质、压力、外输压力要求，采用低温分离法。在轻烃回收发展过程中，经不断完善和改进，现已形成燃气引擎往复式压缩机；分子筛脱水；多股流冷箱换热；重烃逐级降压闪蒸提馏脱水技术；丙烷制冷；膨胀机制冷；导热油供热；ＤＨＸ工艺；屏蔽液烃泵；分布式集散控制系统和安全联锁控制１０项关键技术。     

MIS型单晶硅液晶光阀

详细介绍了一种新颖、快速响应的金属－绝缘层－半导体构成的MIS型单晶硅液晶光阀的结构、工作机理、制作工艺和性能参数测试。液晶采用45°扭曲向列型混合场效应工作模式。所得到的光阀的极限分辨率为40lp／mm，口径40mm，最大对比度＞100：1，在930nm（△λ＝40nm）写入光灵敏度为20μW／cm2，响应时间为15ms。报道了该光阀在大屏幕投影显示中的应用。     

轻武器专业用数据库研究

从需求分析、概念设计、数据库管理系统的结构、数据结构以及数据库的建立等五个方面论述了轻武器专业用数据库的设计技术，提出了专业用数据库建立过程中的几项关键技术的解决方法。     

自发参量下转换光场的实验研究进展综述

自发参量下转换(spontaneous parametric down-conversion,SPDC)光场是基于单色泵浦光子流和量子真空噪声对非线性晶体的综合作用而产生的,它固有的量子起源决定了在非经典光场研究中的重要地位和作用.对SPDC光场的相干特性和它在绝对测量光电探测器量子效率中的应用进行了深入而细致的研究和探讨.     

An Arctangent Unwrapping Technique of Photoelasticity Using Linearly Polarized Light at Three Wavelengths

Abstract:  In the automatic measurements of the principal stress directions ψ and the total relative phase retardation ρ _tol, ψ and ρ _tol can be easily obtained by the phase unwrapping method using the arctangent function. However, only some published works exist on the measurements of ψ and ρ _tol by photoelastic techniques using a linearly polarised incident light source. This paper presents the technique of applying an unwrapping by means of the arctangent function to photoelasticity. The technique overcomes the error associated with the quarter-wave plate by using an incident light of different wavelength and does not need an interpolation for the determination of ψ . The technique is validated by determining ψ and ρ _tol for the well-known circular disk subjected to a diametral compressive load model.     

定电流对LED的重要性

高功率超高亮度LED已经开始大量应用.要实际体现LED(尤其是高功率超高亮度LED)的优点,采用定电流驱动方式必要条件之一.