中小功率CO2激光加工机的设计与研制

本文简要介绍了新研制成功的中小功率ＣＯ２激光加工机的设计依据，技术方案及其所达到的性能指标情况。本机的研制成功，为在非金属材料上切割出各种艺术图形和文字，提供了一种功能丰富、实用高效的新型技术设备。     

Wavelet-Based Mixed-Resolution Coding Approach Incorporating with SPT for the Stereo Image

ELECTRONICS TECHNOLOGY1. INTroDUCTIONThe human brain can process subtle differences between the images that are presented to the left and right eyesto perceive a three-dimensional (3-D) outside world. This ability is called stereo vision. A stereoscopic systemmay be used to stimulate the stereo vision ability edificially. A stereo pair, a pair of images of the same sceneacquired from two different perspectives, is presented to the observers so that the right image is seen by theri…     

研究生培养计划的制度分析

以新制度经济学作为背景,以制度分析方法为基本工具,从交易费用、制度供求均衡和制度变迁等方面对现今的研究生培养计划进行了分析,以期有针对性地提出有利于研究生、学校和国家的培养制度。     

第一类超Cartan-Hartogs域上的消没定理

证明在第一类Cartan-Hartogs域上,对于Bergman度量下平方可积调和(r,s)形式空间成立Hr,s2(YI(N;m,n;k))=0,(∨)r s≠N mn.     

非线性常微分方程组边值问题三正解的存在性

通过讨论一类非线性二阶常微分方程组边值问题正解的存在性．指出在合适的条件下，利用抽象的不动点定理，证明了该边值问题至少存在三个正解．     

钠掺杂反式聚乙炔中孤子晶格的局域振动模

从包含电子－电子相互作用和外库仑势的ＳＳＨ推广模型出发，计算了在各个掺杂浓度（杂质等距离分布）下反式聚乙炔中孤子晶格周围的局域振动模。计算结果表明：在掺杂浓度为１．６７％时，反式聚乙炔存在１０个局域模；在浓度为３．３３％～１０．００％时，存在８个局域模；而在浓度大于１３．３３％时，所有的局域模都消失变为扩展模。     

预应力混凝土拼接空心板实验梁的研究

在拼接板梁接头室内模型试验的基础上，阐述了预应混凝土拼接梁桥在设计、施工中应注意的问题，并结合宁连公路高沟实验桥介绍了预应力混凝土拼接空心板梁桥的设计和施工．     

Admissible model noise upper bound with constraint of stochastic passage characteristics

In some object tracking systems,the moving object future position is an area (i.e.,target area).It is a successful estimation strategy if the predicted points fall in the target area.If the object makes a sudden maneuvering,the prediction may get out of the target area easily which may make the tracking system lose the object.The aim is to investigate the admissible maximum object maneuvering intensity,which is characterized as model noise variance,for such kind of tracking system.Firstly,the concept of stochastic passage characteristics over the boundary of target area and their relationship with prediction error variance are described.Secondly,the consistency among the indices of regional pole,prediction error variance and stochastic passage characteristics is analyzed.Thirdly,the multi-indices constraints are characterized by a set of bi-linear matrix inequalities (BMIs).Then,the admissible maximum model noise variance and the satisfactory estimation strategy are presented by iteratively solving linear matrix inequalities (LMIs) to approximate BMIs.Finally,a numerical example is proposed to demonstrate the obtained results.     

基于霍尔效应的低成本简易流量计

根据霍尔效应采集流量信号,采用市面上常见的AT89C52型单片机处理数据,用1602LCD显示屏显示数据,设计出低成本的液体流量计。并且在流量计的后置电路中加入了反馈控制部分,当流量超过规定流量后,可以给出中断信号。可以应用于饮水机,或者水泵。     

KHN滤波器频率特性的进一步研究

提出了一种能同时或能分别实现低通、高通和带通滤波的多功能KHN滤波器,通过调节其电阻比,其电路也能被修改成一个正交振荡器,而且其电路的极点频率和品质因数能够被独立地,精确地调节.该电路使用了3个集成运放、2个电容和9个电阻,且使用的元件较少,性价比高,计算机仿真证明它正确有效.