低码率活动图像编码

本文探讨了低码率活动图像编码的特点，对较新的图像编码标准Ｈ．２６３作了计算机模拟，和Ｈ２６１在相应的码率下作了比较，并对Ｈ．２６３的各选项的效果进行了讨论     

产生M序列的一个递推算法

M序列是一类具有最长周期的非线性移位寄存器序列。本文给出了2元n级M序列的一个新的递推算法,该算法很容易实现,而且只要稍加修饰便可生成大量的M序列。     

PLC软件执行时序和硬件响应的合理配合

通过实例分析了PLC软件的执行时序与PLC硬件响应之间合理配合的重要性 ,并给出了实现这种配合的一种具体方法。     

复合材料层压板振动参数的铺层顺序优化研究

本文针对目前在复合材料结构设计中较少考虑的振动特性优化问题,采用减缩区间法与枚举法相结合的手段,对给定层数和角度的层压板进行了铺层顺序的优化研究,使其满足振动频率和模态阻尼的要求。通过对20层对称层板的计算可以看出,采用本文所述方法,不仅可节省大量计算时间,而且所得的频率和比阻尼容量值与实验结果具有良好的一致性,证明了该方法的可靠性。本文的研究可作为工程设计中一种有效的手段,所完成的软件具有一定的工程应用价值。     

一类新的宽间隔跳频序列族的构造

基于GF（p)上的m序列构造的最佳跳频序列，提出了一种宽间隔跳频序列族的构造方法。通过理论推导和计算机模拟，表明该宽间隔跳频序列族具有较好的汉明相关性能，略差于最佳跳频序列族。     

Multimethodical Approach and Generation of Sequence of Expressions for Acceleration of Repetitive Analysis of Analog Circuits

In this paper a concept of multimethodical program and a classification of Sequence of Expressions (SoE) for analog circuit analysis are discussed. It is shown that the proper selection of circuit analysis method as well as method of SoE generation enables the minimization of arithmetic operations during repetitive frequency and transient analysis of analog circuits.     

On the Computation of Correlation Sequences in 3-D Recursive Digital Filters

In this paper we are concerned with the computation of correlation sequences and complex integrals arising in Three-dimensional (3-D) recursive digital filtering applications. In particular, we focus on presenting a reliable and accurate method for evaluating triple complex integrals having a rational-form integrand. The basic idea is to reduce the triple complex integral into a double complex integral. The main computational tasks involved in the method includes the product-to-sum decomposition of the rational-form integrand, the integration of a definite integral, and the finding of inside-unit-circle (IUC) roots of 1-D polynomials. The proposed method of evaluating multiple complex integrals has its great applications in the design of optimal 3-D nonseparable-denominator recursive digital filters with minimum sensitivity and/or roundoff error. To demonstrate the effectiveness of the presented method, two numerical examples are given.     

塔里木盆地石炭系层序地层学及岩相古地理研究

根据塔里木分地有关石炭系地层的地震资料、钻井资料和露资料，将其分为３个三级沉积层序（Ｃ１、Ｃ２、Ｃ３）和８个沉积体系域（Ｃ１＾１，Ｃ１＾２，Ｃ１＾３，Ｃ２＾１，Ｃ２＾１，Ｃ２＾２，Ｃ３＾１，Ｃ３＾２）。盆地相区的低水位沉积体系域和海侵沉积体系体系域较发育，而高水位沉积体系域不发育；台地相区的海侵沉积体系域和高水位沉积体系域较发育，而低水位沉积体系域缺失。按照层序地层学的观点认为，石炭纪时期的塔里木     

塔中地区前中生界层序地层特征与非构造圈闭

塔里木盆地塔中地区前中生界发育4级不整合面。根据不整合面发育特征，将震旦系-二叠系划分为3个I级层序、9个Ⅱ级层序和19个Ⅲ级层序。塔中地区古生界各种类型非构造圈闭的发育均与多期重大不整合面(地层削截面、超覆面、缺失面等)及层序界面密切相关，可划分为三大类10个亚类，主要分布在I级层序震旦系-下奥陶统巨层序(MSI)和中、上奥陶统-泥盆系巨层序(MS2)顶面的上、下岩性段内，规模很大，是寻找非构造油气田(藏)的重要勘探领域。图3表1参8     

A systematic method of adaptive joint design considering different assembly sequence in sheet metal product

In sheet metal assembly, not only the component variations and tool errors, but also the component structure (joint type) and assembly process (assembly sequence) affect the final dimensional quality. In this paper, a systematic method for adaptive joint design considering different assembly sequence is proposed to meet the in-process dimensional adjustability of KCs (key characteristics). First, the adaptive characteristic of the sheet metal joint is depicted. Then, the mathematical model in order for concurrently optimizing both joint type and different assembly sequence is presented. How to evaluate the combination of joint type and assembly sequence is carried out according to two conditions: (1) for single KC, and (2) for multiple KCs. The KC confliction is considered to ensure the important KCs. Genetic algorithm is used to resolve the optimization of joint design. An example is chosen to demonstrate our method finally, and various joint designs are acquired according to different assembly sequences by this means. The proposed methods make it possible for us to improve the dimensional quality of product in the design stage.