The motion of rigid rod-like particles suspended in non-homogeneous flow fields

Equations are written for the velocities of rotation and translation of rigid rod-like particles suspended in arbitrary Stokes flows. These make use of the first approximation from slender body theory for the evaluation of drag forces parallel and transverse to the particle axis, and neglect couples induced by shear stress at the particle surface. They are therefore asymptotically valid as the particle axis ratio becomes large. Simple forms of the equations, applying in constant viscosity flows, are solved, where possible analytically and otherwise numerically, and results obtained for particle motion in planar Poiseuille and sink flows. These are discussed and displayed in terms of appropriate dimensionless groups in a comprehensive set of plots, that can conveniently be used to provide information on translational and rotational velocities, and orientation and displacement as a function of time, including particle slip along and across streamlines, for a wide range of cases. In this way the effects of non-homogeneity in the flow fields are quantified.     

Solvent-induced morphological change of microporous hollow fiber membranes

Microporous polyethylene hollow fiber membranes (EHF-1 and EHF-2) were subjected to solvent treatment, and the effects of this treatment on membrane morphology and permeating properties were studied. Membranes treated with various organic solvents exhibited enhanced permeability, enlarged pore size, and increased shrinkage in the longitudinal direction. These phenomena were found to depend on the surface tension of the solvent: the higher the surface tension of the solvent, the larger the change in morphology and permeation of the membrane. A mechanism to account for the effects of solvent treatment on the morphology of the membrane is proposed taking into consideration the influence of the type of solvent used for treatment. The enhanced morphological and permeation changes are ascribed to the formation of liquid bridges between two microfibrils of the membrane during drying followed by the deformation and adhesion of the adjacent microfibrils based on the surface tension of the solvent.     

双频激光泵浦光纤放大器中的原子相干效应

用密度矩阵的方法从理论上分析了不同频率的两个激光场混合泵浦的光纤放大器中，由光场诱导的原子相干效应。并由此引入相干修正因子，通过修正的速率方程讨论了两光场与原子的相干作用对放大器增益的影响。     

横向衍射技术测量光纤光栅的特性

提出了一种用Ｈｅ－Ｎｅ激光侧面照射光纤光栅，从另一侧探测光栅的布拉格衍射效率来测量光纤光栅光谱特性的技术，并用该技术测量了光栅的折射率变化的分布。     

碳涂覆光纤表面碳膜形成机理研究

通过分析碳涂覆光纤的测试结果，研究碳涂覆光纤碳膜的形成机理，并应用该机理解释涂覆光纤的高可靠性问题和影响光纤初始强度大小的因素。     

光电惯性技术的发展及对策研究

本文主要就激光陀螺、光纤陀螺、半球谐振陀螺、石英音叉陀螺等光电惯性传感器的发展及应用进行了介绍。并对兵器行业应用和发展光学惯性器件提出建议。     

炸药爆温的光纤测温法测量

本文阐述了光纤测温技术依据的原理，给出了多通道瞬时光纤测温装置的构成利用该装置对液体炸药硝基甲烷的实际爆轰温度及其光谱发射率进行了实验测量，结果分别为３７００±１００（Ｋ）和０７１±０１５     

氧化还原功能纤维的研究Ⅵ．含胺基及乙二胺基功能纤维与Au~（3＋）的氧化还原反应机理

本文通过红外光谱分析、元素分析及光电子能谱分析等实验手段证实胺基及乙二胺基纤维中氧原子与Ａｕ３＋未发生氧化还原反应，而邻近的碳原子被氧化成羟基碳或羰基碳，并伴有氮原子的脱落，而部分吸附态Ａｕ３＋最终被还原成Ａｕ０。     

Pre-filtering Effect in an Iterative Deconvolution Method and Its Application to Signal Recovery in Fiber-Optic Distributed Temperature Sensors

The signal quality of a fiber-optic distributed temperature sensor based on optical time domain reflectometry (OTDR) is improved using a pre-filtering technique in the iterative deconvolution method. Investigation of the performance is proposed using iteration conditions in which recovery rate of the signal-component is equal to that of the unfiltering technique. The recovered signal in the pre-filtering technique gives a good signal-to-noise ratio (SNR), 3 times of the unfiltered signal. Consequently, improvements in the OTDR signal with SNR of from 10 to 100 are obtained under the iterations for both distance and temperature resolutions.     

分布光纤喇曼光子传感器系统的一种解调方法

本文提出一种新的解调方法,在DOFRPS(分布光纤喇曼光子传感器)系统中采用Rayleigh散射OTDR(光学时域反射)曲线解调Raman散射OTDR曲线,提高了系统的测温灵敏度、测温精度,扩展了系统的功能,在2km光纤上可实时测量1000个点的温度、应力和压力;在系统中设置了光纤取样环,确定系统的修正系数,通过计算机进行实时修正,提高了测量稳定性,实验结果与理论分析一致,系统的测温精度达±1℃。