Numeral eddy current sensor modelling based on genetic neural network

This paper presents a method used to the numeral eddy current sensor modelling based on the genetic neural network to settle its nonlinear problem. The principle and algorithms of genetic neural network are introduced. In this method, the nonlinear model parameters of the numeral eddy current sensor are optimized by genetic neural network （GNN） according to measurement data. So the method remains both the global searching ability of genetic algorithm and the good local searching ability of neural network. The nonlinear model has the advantages of strong robustness, on-line modelling and high precision. The maximum nonlinearity error can be reduced to 0.037% by using GNN. However, the maximum nonlinearity error is 0.075% using the least square method.     

Two-vibron bound states in the β--Fermi--Pasta--Ulam model

This paper studies the two-vibron bound states in the β- Fermi Pasta-Ulam model by means of the number conserving approximation combined with the number state method. The results indicate that on-site, adjacent-site and mixed two-vibron bound states may exist in the model. Specially, wave number has a significant effect on such bound states, which may be considered as the quantum effects of the localized states in quantum systems.     

Copyright protection in digital museum based on digital holography and discrete wavelet transform

A new method to protect the copyright of digital museum based on digital holography is proposed. The Fresnel hologram of watermark image is embedded in the object to be protected through discrete wavelet transform （DWT）. After the watermark detection, the copyright information appears in the reconstructed hologram. With the higher redundancy feature in the hologram, the proposed technique can actually survive several kinds of image processing. Experimental results prove that the presented method has good robustness in image protection.     

高精度直流传感器DCCT标准测试系统

在北京正负电子对撞机二期改造工程(BEPC Ⅱ),磁铁电源系统大量使用了电流型直流传感器(DCCT)作为电源的反馈和回采器件.为了能够对DCCT的性能进行检测和校准,设计研制了高精度直流传感器DCCT标准测试系统.该测试系统主要由PC工控机、7又1/2数字万用表、超高精度直流传感器和高精度直流稳流电源构建而成.论文中主要介绍了测试系统的功能和系统软、硬件结构,并给出了测试系统在实际DCCT检测中的测量数据.     

一种时序逻辑网络的快速设计方法

引用1984年尹克震提出的“开关函数的反演公式”,采用伪随机序列技术的思想,提出移位寄存器型时序逻辑网络的一种快速设计方法。     

对三线摆测物体转动惯量实验的改进

本文介绍了三线摆测物体转动惯量实验中用光控数字毫秒计测量周期的方法，提高了测量精度。     

ON THE ORDER PROPERTIES OF DIGITAL CURVES IN THE PAN-EUCLIDEAN GEOMETRY

How to increase the speed in drawing and recognizing curves has always been a major concern. From the Breshenham Algorithm and DDA Algorithm in the sixties to the double-step and quadruple-step line generation iu the eighties, curves were all dragon point by point. The algorithm in this paper fully utilizes machine commands to accelerate the generation of lines and curves. We introduce and prove for the first time characterization theorems of the segment code order of digital lines and curyes. These theorems give new methods in the recognition and the measure of smoothness of lines and curves.     

狭缝的演变与彩虹全息术的发展

彩虹全息术的发生与发展是与狭缝的引入与演变相关的。本文试图用一个简明的表格形式把迄今为止存在着的各种彩虹全息图及其变化状态做一个形象化的小结。     

数字剪切散斑干涉术中的刚体位移补偿的新方法

给出一个数字剪切散斑干涉术中的刚体位移补偿的新方法，当刚体位移大于一个像素时，加载前后的散斑图将会由于位置的变化导致失相关，重新安排每一个像素将会克服此失相关，散斑平均、条纹重构以及迭代方法用来改善条纹质量，消除散斑噪声，最后得到可取结果。