基于DSP的光纤法珀应变仪数据采集技术研究

针对基于TMS320VC33的DSP光纤法珀应变测量仪，对VC33与光电转换模块之间的数据采集进行了探讨，重点介绍了VC33与光电转换模块的命令发送和数据采集的思路及软件实现，在此基础上，得到的光纤法珀应变传感器干涉信号图与理论上传感器的干涉信号图分布基本一致，并对产生差异的原因做了简单说明。验证了该采集技术的可行性。     

配电网自动化—变结构耗散网络新算法

在配电变结构耗散网络中引入顶点负荷、弧负荷、顶点状态、网形，网基、耗散网络，开环变结构网络等新概念，通过研究弧结构矩阵，负荷矩阵，额定负荷矩阵，归一化负荷矩阵，网基结构矩阵，顶点状态矩阵，源点分布矩阵等数据结构，建立了基形变换和形基变换两种处理变结构的计算方法。     

Finding Starting Points for Tracing Surface Intersections

1 Introduction Finding out proper starting points for all the intersection curves between two surfaces is a key process in numerical tracing methods for surface-surface intersection (SSI) problems. A number of methods [1] are introduced to calculate the starting points. Cugini et al. [2] introduced the concept of shrinking bounding boxes to calculate starting points. This method is simple and in some cases effective, but it may miss some intersection components. Muellenheim [3] presented an…     

Fast Algorithms for Revision of Some Special Prepositional Knowledge Bases

In this paper, the computational complexity of prepositional clause set counterfactuals is discussed. It is shown that the computational complexity of prepositional clause set counterfactuals is at the second level of the polynomial hierarchy, and that the computational complexity of prepositional Horn clause set counterfactuals is at the first level of the polynomial hierarchy. Furthermore, some polynomial algorithms are presented for some special prepositional clause set, such as the unique satisfiable clause set and the clause set of which only one subset is minimally inconsistent with the input clause whose inconsistency check can be solved in polynomial time.     

对GML3.0的探讨

Internet与GIS结合成互联网地理信息系统(Internet GIS)是GIS软件发展的必然趋势,Internet GIS用于分布式地理信息的在线发布,并为分布式地理信息提供在线实时处理与分析的工具。对GML3.0(Geography Markup Language 3.0,地理标记语言)的发展和核心技术进行了深入的研究,其主要内容包含了GML3.0的数据类型、要素、要素集合、几何模型的类型及元素、时态、层等,给出了一些内容模型以及相关内容的UML表示,还给出了使用GML3.0进行数据共享和互操作的应用实例,并对未来的GML版本进行了预测。     

基于3S技术的北京野鸭湖湿地资源的动态变化研究

充分利用现有的遥感影像资料,选取合适的算法对不同传感器和不同时相的遥感图像进行融合,得到清晰且分辨率高的融合图像,利用地理信息系统软件叠置分析功能并结合影像特征分析和野外调查,消除由于不同时相融合带来的不利影响。有效地提取出野鸭湖湿地1998年、2000年和2002年的湿地面积,并对其空间变化进行了对比分析。研究结果表明:由于近几年的持续干旱,野鸭湖湿地面积和空间位置发生了较大的变化。     

The Progress of a Microbeam Facility in the Institute of Plasma Physics

The progress of a microbeam facility in the institute of Plasma Physics was discussed in this paper.This kind of equipment can supply single-particle beam which may be implanted into cells in micrometer-radius and measured by a new outstanding detector among global microbeam systems.Measurements by some plain targets showed that the highest current after the accelerator tube can be larger than 20μA ,the H2^ current before the second bending magnet is near 0.9μA ,the current after the second bending magnet is near 0.8μA,and the current of the beam line(after a 2-mm diameter aperture)is near 0.25nA which is enough for the single-particle microbeam experiment.It took scientists 3 months to do their microbeam experiment after setting up the qccelerator beam line and get the microbeam from this equipment.Two pre0collimators were installed between the 2-mm diameter aperture and the collimator to survey the beam.Tracks on the CR39 film ectched in the solution of NaOH showed that the beam can go through the collimator including a 10μm diameter aperture and the 3.5μm thick vacuum sealing film(Mylar).A new method,which is called optimization of the beam quality,was put forward in this paper,in order to get smaller diameter of beam-spot in microbeam system.     

The Influence of Magnetic Permeability on the Configuration of magnetic Field in Helimak Device

The Helimak of USA is a plasma physics experimental device designed and built by CASIPP.Its configuration of magnetic field is of very importance during the operation of this device.In this paper,the influence of magnetic permeability on configuration of magnetic field will be discussed due to the effect of weld metal in the vacuum vessel of Helimak,and some conclusion is useful for some engineering designs of the fusion experimental device.     

A New Grade Carbon Black Produced by Thermal Plasma Process

This paper presents a new route about producing carbon black,by wich the natural gas cracking is carried out in the absence of oxygen thanks to an electric energy supply externally given by a plasma jet.The carbon black produced by this process has a narrow size distribution and a small average diameter of 38nm as well as a highly branched aggregate.The higher DBP value of 1.40ml/g shows it should be a high structure carbon black.The FTIR spectra shows that there are lots of aromatic c-c bonds and a large amount of nitrogen-coutaining functional groups on the carbon blacks surface,such as-NH,-CN as we3ll as -CH,-OH,-COOH groups.     

Surface Plasmon Resonance Enhanced Scattering of Au Colloidal Nanoparticles

Abstract Suspended gold nanoparticles have been synthesized via electrochemical method.The strongest resonance scattering peak is at 485 nm, which results from the surface plasmonresonance. When the excited wavelength is at 242 nm (12.4×10~(14) Hz), there have been a 1/2fraction frequency scattering peak at 485 nm (1/2×12.4×10~(14) Hz) and a 1/3 fraction frequencyscattering peak at 726 nm (1/3×12.4×10~(14) Hz) displayed. Emission spectra with different particlediameters were compared, the intensity of scattering light increases with the particle size. Thefrequency-dependent scattering average cross section of small particle was calculated from Mietheory. The model calculation is in agreement with the experimental results.