颗粒物在非均匀电场中最大场强的经验公式

提出了一个经验公式,用于解析计算颗粒物在非均匀电场中的最大场强。只要计算出了无颗粒物时的电场分布,然后根据颗粒的位置和半径,就可以求出含颗粒物时的两个极值电场。将不同条件下的该经验公式的计算结果和模拟电荷法的数值计算结果作了比较,二者保持了高度一致性。     

异向平行啮合型双螺杆挤出机熔体输送段三维流场分析

建立了高聚物熔体在异向平行啮合型双螺杆挤出机熔体输送段的三维等温流动模型,利用ANSYS有限元分析软件对流场进行了分析,求出了熔料在螺槽内的速度场、压力场和粘度场的分布。通过流率计算,分析了不同的啮合间隙及操作条件对此类挤出机工作特性的影响。     

非方广义系统奇异二次指标最优控制问题

讨论了非方广义系统的奇异二次指标最优控制问题.在一些常规条件下,分别对有限及无限时间区间情形给出了问题的解,并把最优控制综合为最优状态的线性反馈,对系统闭环的特性做了探讨.     

焉耆盆地非背斜油气藏形成条件及勘探方向

焉耆盆地是中国西部众多中新生代小型含煤盆地之一。自 1993年开始进行风险勘探以来 ,钻探目标主要是背斜圈闭 ,主要油气藏类型均为背斜或断背斜型。目前盆地的勘探程度仍较低 ,剩余资源量主要赋存于非背斜圈闭中。随着勘探程度的加深 ,非背斜油气藏将在油田勘探中占据越来越重要的地位。对该盆地非背斜圈闭形成的地质条件进行了系统分析 ,并讨论了盆地内可能存在的非背斜油气藏的成因分类 ,初步预测出本区发育 4大类 11种非背斜圈闭油气藏 ,并讨论了不同类型非背斜圈闭的发育演化史 ,指出了盆地非背斜油气藏的勘探方向。     

RBLs和平谱射电类星体间峰值频率与光谱指数的相关性分析

对Fossati等人的研究中所给出的Blazar样本分别计算同步辐射峰值频率及射电到X射线的宽波段光谱指数.在此基础上研究了RBLs和平谱射电类星体间的峰值频率与光谱指数的相关性质.结果表明:两者之间存在着较强的相关性质,XBLs和RBLs位于不同的区域,可以通过αrx=0.75和logvp=14.75±0.4较好地区分开来.RBLs位于XBLs和FSRQs的中间态.这意味着它们之间的能谱分布形状是有差异的,因而有助于了解其内部辐射机制.     

Short‐term forecasting of industrial electricity consumption in Brazil

This paper presents short‐term forecasting methods applied to electricity consumption in Brazil. The focus is on comparing the results obtained after using two distinct approaches: dynamic non‐linear models and econometric models. The first method, that we propose, is based on structural statistical models for multiple time series analysis and forecasting. It involves non‐observable components of locally linear trends for each individual series and a shared multiplicative seasonal component described by dynamic harmonics. The second method, adopted by the electricity power utilities in Brazil, consists of extrapolation of the past data and is based on statistical relations of simple or multiple regression type. To illustrate the proposed methodology, a numerical application is considered with real data. The data represents the monthly industrial electricity consumption in Brazil from the three main power utilities: Eletropaulo, Cemig and Light, situated at the major energy‐consuming states, Sao Paulo, Rio de Janeiro and Minas Gerais, respectively, in the Brazilian Southeast region. The chosen time period, January 1990 to September 1994, corresponds to an economically unstable period just before the beginning of the Brazilian Privatization Program. Implementation of the algorithms considered in this work was made via the statistical software S‐PLUS. Copyright © 1999 John Wiley & Sons, Ltd.     

Why do regime‐switching models forecast so badly?

Most non‐linear techniques give good in‐sample fits to exchange rate data but are usually outperformed by random walks or random walks with drift when used for out‐of‐sample forecasting. In the case of regime‐switching models it is possible to understand why forecasts based on the true model can have higher mean squared error than those of a random walk or random walk with drift. In this paper we provide some analytical results for the case of a simple switching model, the segmented trend model. It requires only a small misclassification, when forecasting which regime the world will be in, to lose any advantage from knowing the correct model specification. To illustrate this we discuss some results for the DM/dollar exchange rate. We conjecture that the forecasting result is more general and describes limitations to the use of switching models for forecasting. This result has two implications. First, it questions the leading role of the random walk hypothesis for the spot exchange rate. Second, it suggests that the mean square error is not an appropriate way to evaluate forecast performance for non‐linear models. Copyright © 1999 John Wiley & Sons, Ltd.     

稀薄大气层内轻诱饵速度识别法

随着地基相控阵雷达测速精度的大幅度提高,针对稀薄大气对轻诱饵有明显的减速作用,提出了一种新的目标识别方法——稀薄大气层内轻诱饵速度识别法,并对其识别原理、识别判决准则进行了详细阐述和分析,该方法通过雷达高精度多普勒测速及轨迹估计信息,获取轻诱饵气动减速特性进行识别,避开了质阻比参数估计中动态收敛过程。最后通过典型算例的计算机仿真计算,验证了该方法的有效性。     

量子通信现状与展望

本文综述量子通信基本原理、方法、技术手段与应用.介绍量子保密通信基本协议和诱骗态方法,以及基于纠缠分发的量子通信,含基于纠缠光子对的量子保密通信、量子态隐性传输、纠缠光子对操控等.介绍量子通信的技术与应用现状并对未来发展方向做展望.     

两阶段非线性0-1目标规划模型及在数据库超宽智能打印中的应用

本文从实际工作中提出一种新的特殊的优化问题,即所谓的两阶段非线性０－１目标规划问题．研究了建模、算法和若干性质,并提出了一种新的算法,可以一次求出全部的可行解及最优解