悬置线交指型带通滤波器设计

介绍了悬置线交指型带通滤波器的设计原理和方法,利用计算机辅助设计工具进行数值计算,给出了悬置线的电路板尺寸参数,并应用仿真软件对该悬置线交指型带通滤波器进行仿真和优化设计, 通过仿真得到了该滤波器的响应曲线,与实验结果吻合的较好。     

三维Minkowski空间中有相等主曲率函数的一类特殊曲面的位置向量场

讨论三维Minkowski空间R2 .1中一类特殊曲面在主曲率函数相等时的情形 ,给出了这类曲面在这一情形下的位置向量场     

Curved Chaotic Map Time Series Models and Their Stochastic Reversals

This paper considers two types of chaotic map time series models, including the well-known tent, logistic and binary-shift maps as special cases; these are called curved tent and curved binary families. Deterministic behaviour is investigated by invariant distributions, Lyapunov exponents, and by serial dependency. Stochastic time reversal of the families is shown to produce models which have a broader range of stochastic and chaotic properties than their deterministic counterparts. The marginal distributions may have concentrations and restricted supports and are shown to be a non-standard class of invariant distribution. Dependenc y is generally weaker with the reversed stochastic models. The work gives a broad statistical account of deterministic and stochastically reversed map models, such as are emerging in random number generation, communica tion systems and cryptography     

曲线箱梁桥实用设计方法的研究

曲线箱梁桥目前还缺乏比较实用的设计方法．本文对曲线箱梁桥的现有设计方法作了研究，并推荐一种实用设计方法：采用空间梁单元，每个节点取六个自由度；等效梁格的模拟考虑了横向梁格附近有无横隔梁的情况．结果证明，这是一种简便、较精确的设计方法．     

弯曲液面的临界光反射现象

实验中发现了弯曲液面的临界光反射现象,并采集到清晰的、对比度高的弯曲液面临界反射图样。在激光束斜入射的情况下,弯曲液面临界反射的图样中,有一椭圆状暗场,暗场附近区域有明亮清晰的条纹。根据几何光学的分析,解释了这一临界光反射现象。     

含硫氨基酸对肉味香精风味的影响

本文研究了含硫氨基酸进行Maillard反应对肉味香精特征风味的影响。选取几种可以产生肉味风味的氨基酸,优化配比与还原糖进行Maillard反应,并进行了有关结果分析。通过正交设计安排实验,含硫氨基酸与自制鸡肉酶解物、还原糖进行Maillard反应,反应物香味感官评定,确定了含硫氨基酸在香味特征中的作用。     

低高度曲线箱梁桥参数分析

本文分别采用空间板壳及梁格模型对曲线箱梁桥的曲率半径、支承方式、腹板厚度进行了参数分析，明确了其对箱梁主要部位静活载内力、结构变位及支承反力的影响     

单模光纤定向耦合器的理論分析(英文)

本文应用弯曲光波导耙合系统中的广义耦合模方程来分析弯曲单模弱导光纤耦合结构,导出了在模式间的耦合系数、非正交系数及耦合功率式,与经典的耦合模理论相比较,本文提出的公式显得更精确,同时与实验结果一致。     

On concurrence of several linear regressions and applications to problems of enzyme kinetics

In comparing several regressions E(y_ij) =α_i + β_ix_ij i = 1, 2, ..., k, j = 1,2, ..., n_i, researchers are generally interested in the following five problems: whether they have (1) equal slope, (2) equal intercept, (3) coincidence, (4) common intersection on X-axis, and (5) common intersection on (X,Y) - plane. Problems (1) - (3) can be put into the framework of the general linear hypothesis and the F-test can be used. However, problems (4) and (5) cannot be put into the general linear hypothesis because they are ratios of parameters. Hence, in this paper we consider the generalized likelihood ratio test for hypothesis testing. An application to an enzyme kinetics problem in Aniline Metabolism is demonstrated     

The Apparent‐Time Construct and stable variation: Final /z/ devoicing in northwestern Indiana1

As real‐time language data becomes increasingly available for sociolinguistic research, a growing number of studies are benefitting from it in order to study language changes in progress, some of which even explicitly seek to scrutinize the Apparent‐Time Construct itself. Vanishingly few real‐time studies, however, have focused specifically on stable sociolinguistic variables, leaving an important gap in our understanding of the Apparent‐Time Construct's abilities to model real‐time facts. In an effort to address this gap, the present study analyzes a presumably stable sociolinguistic variable – final /z/ devoicing – in extreme northwestern Indiana through real and apparent time. A series of Varbrul analyses indicate that this variable is, indeed, stable throughout the 20 years of real time covered by the data and that its stability is successfully modeled in apparent time. Additionally, similarities in /z/ devoicing between this community and some other communities where it has also been studied are identified and discussed.