活性炭吸附法脱除加氢催化柴油中的硫化物

采用5种活性炭对加氢催化柴油进行吸附脱硫,通过对活性炭的吸附效果及工艺参数的研究,探索了活性炭吸附脱硫最适宜的工艺条件。实验结果表明,分别选用比表面积为854.97,1 108.61 m2/g,相应微孔平均孔径为0.581 4,0.627 4 nm的活性炭,在粒度为40~80目,流速为0.25 mL/m in,吸附柱高径比为30/1的条件,可将不同原料油中有机硫含量分别从1 354.96,665.50μg/g降至360.40,69.61μg/g,脱硫率分别为73.40%和89.54%;在20~100℃时,随着温度的升高,活性炭吸附脱硫效果增强。     

Effects of Light, Oxygen, and pH on the Absorbance of 2,2-Diphenyl-1-picrylhydrazyl

ABSTRACT: The absorbance of 2,2-diphenyl-1-picrylhydrazyl (DPPH) at 517 nm in methanol and acetone decreased by 20 and 35% for 120 min at 25 °C under light, respectively; in the dark it did not change significantly for 150 min. Decomposition of DPPH under 21% oxygen after 90 min under light was significantly higher than that under 1% oxygen. Absorbance of DPPH in pH 4 buffer solution in methanol, and in pH 10 buffer solution in acetone, decreased by 55 and 80%, respectively, under light for 120 min. The evaluation of antioxidant activity by the changes of DPPH absorbance should be carefully interpreted since the absorbance of DPPH at 517 nm is decreased by light, oxygen, pH, and type of solvent in addition to the antioxidant.     

应用于激光光谱学中的短脉冲光峰功率的测量

报道了应用于激光光谱学中直接测量短脉冲光峰值光功率的双通道测量系统。给出了两个通道的线性关系和频率响应曲线。实验表明此测量系统可以测量到脉宽为10ns的脉冲光峰功率1％的放大和吸收。     

机载导弹逼近红外告警系统发展现状

为了有效对付地空、空空导弹威胁、国外在５０年代中期就开始研制红外告警设备。目前已广泛装备部队。综述了导弹逼近红外告警系统发展现状。     

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.     

Mechanoluminescent pulse pressure sensors. Processing of output optical signal

The process of mechanoluminescence transformation of a pulse pressure sensor is considered. The process consists in excitation of emission under the action of mechanical loading. An algorithm for use in processing the output optical signal of the sensor that makes it possible to determine an input shock pulse is presented. __________ Translated from Izmeritel’naya Tekhnika, No. 10, pp. 28–31, October, 2007.