网络丝生产工艺探讨

用HEBERLEINP2 12网络喷嘴 ,在法国ICBTFTF12E3加弹机上生产不同网络度和牢度的网络丝。探讨了网络张力、压缩空气压力等工艺条件与网络度和牢度的关系 ;优化工艺参数 ,生产的网络丝满足了市场多样化的需求。     

A New Method for Getting Rational Approximation for Fractional Order Differintegrals

In this paper a new algorithm is presented to calculate the poles and zeros to approximate a fractional order (FO) differintegral (s^±α,α∈(0,1)) by a rational function on a finite frequency band ω∈(ω_l,ω_h). The constant phase property of the FO differintegral is the basis for development of the algorithm. Interlacing of real poles and zeros is used to achieve the constant phase. The calculations are done using the asymptotic Bode phase plot. A brief investigation is made to get a good approximation for the Bode phase plot. Two design parameters are introduced to keep the average phase close to the desired phase angle and to keep the error within the allowed bounds. A study is done to empirically understand the relationship between the error and the design parameters. The results thus obtained help in the further calculations. The algorithm is computationally simple and inexpensive, and gives a fairly good approximation of fractance frequency response on the specified frequency band.     

参数鲁棒镇定问题的可解性必要条件

给定对象族P(s,δ)其参数是向量p范数有界的不确定参数δ的仿射函数.用根轨迹 法证明,P(s.δ)的任意两个元素的可同时镇定性等价于P(s.δ)的每个元素的可镇定性.结果表 明,P(s,δ)的可镇定性可作为一个有效的判断条件以排除那些鲁棒镇定问题肯定无解的情况, 从而更加有效的应用棱边和顶点等已知结果寻找鲁棒镇定问题的解.     

Perturbed polynomials with zeros in the left-sector

We investigate the directional perturbation of a real nominal polynomial. We propose an algorithm for computing the largest allowable perturbation bound which will simultaneously maintain the zeros of the perturbed polynomial within the left-sector in the complex plane.     

场视频信号编码器的性能分析

为了不断地提高压缩性能,ITU和ISO组织推出了H.26x和MPEG-x系列标准.由于场视频信号在显示时存在的场效应问题,系列标准中只有3个标准给出了场视频信号的编码方法,分为帧/场固定和帧/场自适应两大类.通过测试给出了这两类方法对场视频信号的编码性能比较,并给出了影响场视频信号编码性能的主要因素.     

Large‐video‐display‐format conversion

Abstract— High‐quality video‐format converters apply motion estimation and motion compensation to prevent jitter resulting from picture‐rate conversion, and aliasing due to de‐interlacing, in sequences with motion. Although initially considered as too expensive, high‐quality conversion is now economically feasible, and since 1995 has been available in consumer television ICs. This paper addresses the issues in format conversion and shows recent progress, introducing a new high‐quality video‐format‐conversion IC for consumer applications.     

网络器丝道截面形状对网络丝质量的影响

研究了7种丝道截面形状的网络器及其网络工艺参数对网络丝性能的影响。结果表明,圆形截面丝道的网络器可以加工出较高网络度的网络丝;三角形丝道截面的网络器加工的网络丝具有较高的网络牢度;椭圆形丝道截面的网络器和倒三角形丝道截面的网络器可以加工出网络度和网络牢度都较高的网络丝,其中倒三角形比椭圆形丝道截面的网络器加工的网络丝的网络度和网络牢度要高,而正方形截面丝道的网络器的性能最差。网络工艺参数对网络丝的网络度有影响,而对网络牢度影响不大。     

MPEG-4隔行方式下P帧运动补偿与逐行方式之比较研究

作为与逐行方式相对应的隔行方式在视频编码中仍有着相当多的应用,通过对隔行方式下xvid开源程序中P帧运动补偿问题的校正,阐述了MPEG-4 P帧运动补偿的一般过程.并对基于帧预测（frame-predicted）的帧间宏块（interMB）运动矢量预测因子的求取进行了介绍,在此基础上,阐明了基于场预测（field-predicted）的帧间宏块上、下半场运动矢量预测因子的计算.给出了帧预测宏块、场预测宏块半象素插值的程序实现,进而对逐行与隔行方式下P帧运动补偿的实现做出较为全面的对比分析.     

机织物组织点的自动识别研究

探讨了一种杌织物组织点的自动识别方法.先利用滤波窗口从水平和垂直两个方向分解织物图像,经过合理的二值化和数学形态学处理,确定组织点的位置;再利用每行(列)纱线的平均灰度变化及单个组织点图像经纬向纹理特征,判断组织点类型,输出机织物的组织图.通过对平纹、斜纹和缎纹3种基本组织不同试样的试验,结果表明该方法可以自动识别出机织物组织点类型.