青香蕉抗性淀粉提取条件优化

在研究酶添加量、水解时间、温度等因素对果胶酶活性影响的基础上,通过正交试验确定提取青香蕉淀粉的最适水解条件为料液比1：2、温度45℃、酶解时间50min,此时淀粉得率为4．67％．     

A statistical multivariable optimization method using improved orthogonal algorithm based on large data

Multivariable optimization under large data environment concerns with how to reliably obtain a set of optimization results from a mass of data that influence the object function complexly. This is an important issue in statistical calculation because the complexity between variable parameters leads to repeated statistical calculation analysis and a significant amount of data waste. A statistical multivariable optimization method using improved orthogonal algorithm based on large data is proposed. Considering the optimization problem with multi-parameters under large data environment, a multi-parameter optimization model used for improved orthogonal algorithm is established based on large data. Furthermore, an extensive simulation study on temperature field distribution of anti-/de-icing component was conducted to verify the validity of the statistical calculation analysis optimization method. The optimized temperature field distribution meets the anti-/de-icing requirements through numerical simulation. Simulation results show that the optimization effect is more evident and accurate than the non-optimized temperature distribution with the optimized results of the proposed method. Results verify the effectiveness of the proposed method.     

超声波灭菌在椰奶中应用研究

探索超声波对椰奶中微生物的杀灭效果,主要选取超声波处理功率、处理温度、处理时间三个关键因素,以椰奶中菌落总数为指标做单因素分析。每个因素选取三个水平,通过三因素三水平正交设计,确定超声波灭菌的最佳参数。     

基于数据阵共轭重构的MUSIC角估计算法

介绍了一种利用接收数据及其共轭重构得到新的数据矩阵,然后借助于数据阵奇异值分解实现的修正MUSIC算法,并指出了这将有助于改善协方差矩阵特征值的分布,从而提高信号到达方向（DOA）的估计性能。在相同的信噪比和快拍数条件下,该方法无论是在角估计的均方误差、信号源角分辨能力等方面均优于普通的MUSIC算法,并给出了验证理论分析的计算机仿真结果。     

Statistical properties of Rechtschaffner designs

Rechtschaffner designs are saturated designs of resolution V   in which main effects and two-factor interactions are estimable if three-factor and higher order interactions are negligible. Statistical properties of Rechtschaffner designs are studied in this paper. Best linear unbiased estimators of main effects and two-factor interactions are given explicitly and asymptotic properties of correlations between these estimators are studied as well. It is shown that designs recommended by Rechtschaffner [1967. Saturated fractions of 2ⁿ$2^n$ and 3ⁿ$3^n$ factorial designs, Technometrics 9, 569–576] are not only A-optimal but also D-optimal. Comparisons of Rechtschaffner designs with other A- and D-optimal designs of resolution V are also discussed.     

关于环Z／（m）上线性型的正交组

文章证明了ｋ个ｎ（１≤ｋ≤ｎ）无整系数线型α１１ｘ１＋．．．＋ａ１ｎｘｎ,．．．,ａｋ１ｘ１＋．．．＋ａｋｎｘｎ是模ｍ的正交组的充要条件是整数矩阵（ａｉｊ）ｋ＊ｎ的所有ｋ级子式与ｍ的最大公因数为１。     

用于DVD的MPEG2实时解复用器的FPGA设计与实现

设计了一种模块化,内部采用总线形式,用于ＤＶＤ的ＭＰＥＧ２系统层实时解复用器,并对电路的总体结构、起始头检测电路、ＰＥＳ包头解码电路和ＰＬＬ电路作了详细的介绍和讨论,给出了整个实时解复用器的ＦＰＧＡ硬件实现结果。该系统具有基本流多路分配、系统时钟恢复的功能,同时又有结构简单、耗用资源少和易于集成等特点,适于 ＤＶＤ及相关领域的应用。     

基于正交试验法的电流线圈架塑件工艺参数优化设计

为改善塑件的成型质量,采用正交试验法,选择注射时间、熔体温度、保压压力、保压时间以及冷却时间等5个工 艺参数作为控制因素。对各因素分别赋以4个水平,以塑件的翘曲量作为质量指标,建立正交试验表L16(45)。运用模 拟流动分析软件,对不同工艺条件下的塑件成型过程进行模拟分析,得到各翘曲值。对塑件翘曲产生的原因进行分析,分 析表明：保压时间和保压压力为影响塑件翘曲量最大的2个因素,通过改变这2个因素值可有效改善塑件的翘曲状况。     

Change-over designs with complete balance for first and second residual effects

This paper presents a unified method of constructing change-over designs that permit the estimation of direct effects orthogonal to all other effects when the residual effects of treatments last for two consecutive periods. Explicit methods of analysis of these designs have been obtained for the situations where the first period observations are omitted from the analysis and where the first period observations are included.