数字视频混合系统的设计

介绍了利用Philips的一款视频芯片SAA71 99B实现的数字视频混合系统.该系统可以将一路PAL制彩色复合视频信号编码进入另一路PAL制彩色复合视频信号中,以取代第二路视频中用户指定的颜色,从而实现了两路视频的混合.另外还介绍了如何利用单片机的I/O口模拟I 2C总线以及如何利用单片机进行彩色空间变换的算法.     

自由空间二维榕树网实现方法

鉴于榕树网在自由空间光子交换网络中具有重要的应用价值,分析了榕树网的特点和4×4二维榕树网的空间拓扑结构,通过偏振光分光棱镜、微闪耀光栅阵列、平面反射镜、半反半透镜和液晶空间光调制器的集成,构建二维的榕树交换网实验模块,利用微闪耀光栅的衍射特性,控制每块微闪耀光栅的周期,以实现入射光信号不同方向的闪耀输出,最终完成二维榕树网自由空间水平和竖直方向上的交叉互连,直通则由平面镜反射实现。对二维榕树网实验模块的功能分析表明,该实验模块理论上可以完成4×4二维面阵内光信号(或数据)的排序、交换、组播、广播、矩阵变换等操作,具有交换透明、速度快、空间带宽高等特点,在全光交换和光通信中具有一定的应用。     

剩余油分布及其挖潜研究综述

介绍了国内外剩余油分布的研究现状，从微观规模和宏观规模2个角度对剩余油研究技术进行了综述，微观规模常用的研究技术主要有物理模拟、计算机模拟等，宏观研究常用技术有测井解释、三维地震、流动单元划分等。认为不同的地质环境和开发方式会导致不同的剩余油分布模式，不同油田、不同区块分布模式不同。影响剩余油分布的主要因素中，储层因素是内在的，开发因素是外在的。概括介绍了我国部分油田剩余油挖潜的一些常用技术，认为应主要从改善储层非均质性的地质角度和调整注采状况的开发角度入手，采用动态、静态结合和多学科结合的方法挖潜剩余油。     

Surface tailoring of an ethylene propylene diene elastomeric terpolymer via plasma‐polymerized coating of tetramethyldisiloxane

In the research presented here, we explore the use of a low‐energy plasma to deposit thin silicone polymer films using tetramethyldisiloxane (TMDSO) (H(CH₃)₂? Si? O? Si? (CH₃)₂H) on the surface of an ethylene propylene diene elastomeric terpolymer (EPDM) in order to enhance the surface hydrophobicity, lower the surface energy and improve the degradation/wear characteristics. The processing conditions were varied over a wide range of treatment times and discharge powers to control the physical characteristics, thickness, morphology and chemical structure of the plasma polymer films. Scanning electron microscopy (SEM) shows that pore‐free homogeneous plasma polymer thin films of granular microstructure composed of small grains are formed and that the morphology of the granular structure depends on the plasma processing conditions, such as plasma power and time of deposition. The thicknesses of the coatings were determined using SEM, which confirmed that the thicknesses of the deposited plasma‐polymer films could be precisely controlled by the plasma parameters. The kinetics of plasma‐polymer film deposition were also evaluated. Contact angle measurements of different solvent droplets on the coatings were used to calculate the surface energies of the coatings. These coatings appeared to be hydrophobic and had low surface energies. X‐ray photoelectron spectroscopy (XPS) and photoacoustic Fourier‐transform infrared (PA‐FT‐IR) spectroscopy were used to investigate the detailed chemical structures of the deposited films. The optimum plasma processing conditions to achieve the desired thin plasma polymer coatings are discussed in the light of the chemistry that takes place at the interfaces. Copyright © 2004 Society of Chemical Industry     

可变波长光纤光栅滤波器用微驱动器的研制

为了研制可调谐光纤光栅滤波器而采用拉伸装置和光纤光栅一体化的微小器件结构。实现方法是由微细加工技术加工制造一种新的波长可变光纤光栅滤波器用驱动器，该微型驱动器采用电磁式驱动，由上下两层线圈构成，每个线圈有21匝平面线圈，产生约0．2μNm的扭矩，对应光纤光栅的反射波长变化约5nm。它可应用于可谓谐光纤光栅滤波器的驱动。     

基于复合顺序形态变换的车牌边缘检测

边缘检测是图像分割的重要环节,边缘提取的好坏直接影响了整个图像处理的效果。数学形态学用具有一定形态结构的“结构元素”去度量图像的形态,以解决图像处理和分析问题。文章通过对多种边缘检测方法的分析比较,结合高速公路路口汽车图像噪声大的特点,提出了基于复合顺序形态变换的车牌边缘检测。该方法不但能有效地改善有噪图像边缘检测的效果,鲁棒性好,而且并行快速,便于硬件实现。     

Effect of Reactor Ambient Pressure on the Morphology of Spray Dried Magnesium Sulphate Powders

The effect of reducing the reactor air pressure on the morphology of spray dried magnesium sulphate powders is investigated, experimentally. A reactor, capable of drying and pyrolyzing solution sprays at low pressures, is designed and manufactured. A vibrating mesh nebulizer is employed to generate the spray. Four different pressures, starting from 60 Torr to the atmospheric pressure, and two different reactor air temperatures of 130°C and 420°C, are considered. In addition, two different concentrations of magnesium sulphate solutions are tested. The results are explained based on the effect of reactor air pressure on the droplet evaporation rate.     

Morphology development in polyethylene/polystyrene blends: the influence of processing conditions and interfacial modification

The influence of processing conditions and interfacial modification on the morphology evolution and the composition range within which fully co‐continuous high density polyethylene/polystyrene blend structures can exist during blending in a single screw extruder was studied. Blends ranging from pure A to pure B component, with and without compatibilizer, were prepared under two different shear rates. It was found that high shear rates displaced the breakdown–coalescence balance of the dispersed nodules to the side of coalescence, narrowing the percolation domain and the critical composition for full co‐continuity decreased with increasing shear rates. The addition of a tri‐block compatibilizer induced the percolation threshold of the polystyrene phase to begin at lower percentages of polyethylene but the phase inversion point did not change. The experimental results are discussed in the light of various theoretical models. Copyright © 2005 Society of Chemical Industry     

加氢裂化工艺辅助操作与管理专家系统的开发与应用

近来，专家系统技术的利用已成火炼油与石油化工专家们感兴趣的问题。本文评述了国外这些领域中专家系统应用的进展概况。同时，对我们开发的专家系统工具ＦＥＸＳ的性能作了简介。详述了工业加氢裂化装置辅助操作与管理专家系统的研制过程和系统配置，讨论了系统开发的经验。最后，评价了该技术在炼油与石油化工业中的应用前景。     

Influence of Gaseous Atmosphere on Morphology and Cellular Fatty Acid Composition of Campylobacter jejuni

ABSTRACT: We evaluated the effect of growth environment on morphology and fatty acid (FA) profiles of 2 strains of C ampylobacter jejuni (ATCC 29428 and 33560) grown under various gaseous conditions. Viable counts were determined by plate count and percentages of coccoid cells. FA profiles were measured by gas chromatography. Plate counts were lowest when cultures were grown in air and highest in CO₂ (10%), O₂ (5%), and N₂ (85%). For 29428, percentages of coccoid cells did not differ among treatments. For 33560, percentages of coccoid cells were greater than for 29428 and varied among treatments (13% to 87%). There were no significant ( P > 0.05) relationships between percentages of coccoid cells and amounts of individual or combinations of FA either between or within strains.