转换温度中Berthelot物态方程内压强项温度指数的修正

设定Berthelot实际气体物态方程内压强项中待定的温度指数参数为α,根据热力学理论推导出具有温度指数参数的Berthelot实际气体转换温度与压强的函数关系式,应用计算机MATLAB模拟仿真技术绘制反转曲线,将其与气体实验反转曲线进行对比,确定两者拟合情况较好时的指数修正参数,得到修正后的Berthelot实际气体物态方程。修正后的Berthelot实际气体物态方程在描述气体通过节流手段获得低温时更贴近气体的实验行为,在节流制冷工艺流程中具有更强的使用价值和理论指导意义。     

用具有对数奇点的函数类逼近闭曲线上的连续函数

讨论用函数类Ａｎ（ｚ）λ（ｚ）＋Ｂｎ（ｚ）均匀逼近闭曲线上的连续函数的问题，其中Ａｎ（ｚ），Ｂｎ（ｚ）是不大于ｎ次的多项式，λ（ｚ）＝ｌｏｇｚ＋ａｚ＋ｂ或（ｚ＋ａｚ＋ｂ）α（０＜α＜１）．     

边界耦合Newton渗流方程组的临界曲线

通过构造上下解的方法分析快扩散边界耦合Newton渗流方程组解的长时间行为, 得到了其Fujita型临界曲线和全局临界曲线. 结果表明: 对于很多非线性边界源的Newton渗流方程, Fujita型临界曲线和全局临界曲线不同; 对于本文所考虑的问题, Fujita型临界曲线和全局临界曲线重合.     

C型压力机压装精度控制方法研究

文章针对已设计完成的16tC型压力机结构,利用有限元软件对压力机整机进行最大工况下的工作状态的模拟,得出该状态下压力机整机的力学性能,以校核该压力机的刚度与强度。采用计算机数值模拟结果对压力机结构进行优化。针对优化之后的设计模型,模拟多工况压力机的压装实验,采集多个荷载下压力机竖向压装的位移数据。利用数据拟合的方法对采集的数据进行拟合,近似得出16tC型压力机工作时的压装位移曲线。利用获得的压装位移曲线,修正压力机压装行程,提高压装精度。     

自同态的次数为3的椭圆曲线(英文)

本文将给出自同态的次数为3的定义在复数域上的椭圆曲线的所有同构类.     

关于空间型中闭曲线的平均绝对曲率

对2维空间型中相应的一些主要结果进行了推广。在n维空间型中，比较了任一闭曲线和包含此闭曲线的凸测地球边界上一个大圆的平均绝对曲率。这在一定意义下描述了闭曲线在n维空间型中的弯曲程度。     

Forecasting the Yield Curve in a Data‐Rich Environment Using the Factor‐Augmented Nelson–Siegel Model

This paper compares various ways of extracting macroeconomic information from a data‐rich environment for forecasting the yield curve using the Nelson–Siegel model. Five issues in extracting factors from a large panel of macro variables are addressed; namely, selection of a subset of the available information, incorporation of the forecast objective in constructing factors, specification of a multivariate forecast objective, data grouping before constructing factors, and selection of the number of factors in a data‐driven way. Our empirical results show that each of these features helps to improve forecast accuracy, especially for the shortest and longest maturities. Factor‐augmented methods perform well in relatively volatile periods, including the crisis period in 2008–9, when simpler models do not suffice. The macroeconomic information is exploited best by partial least squares methods, with principal component methods ranking second best. Reductions of mean squared prediction errors of 20–30% are attained, compared to the Nelson–Siegel model without macro factors. Copyright © 2011 John Wiley & Sons, Ltd.     

Mtlab在分形几何中的应用

介绍了matlab软件的绘图功能以及它在分形几何中的应用     

One Direction Rough Law Generation and Its Security Transmission

By using function one direction S-rough sets (function one direction singular rough sets),the concept of one direction rough law is proposed,where one direction rough law is the law pair {w(x)-,w(x)-} composed by w(x)-and w(x)-. If the attribute set {α-,α-} of function one direction S-rough sets changes,then one direction rough law {w(x)-,w(x)-} will change,too. By employing ellipse curves,the concept of one direction rough law security is presented,the security theorem of one direction rough law is proposed and the applications are given. One direction rough law security,which is generated by the intersection and penetration between function one direction S-rough sets and ellipse curves,is a new applied research direction of function S-rough sets.     

（46）（100-106）^Pd偶偶核E-GOS曲线的研究

采用E-GOS方法对（46）（100-106）^Pd偶偶核形状相变进行了研究.研究表明,这些核素都是U（5）-SU（3）的过渡核,且都趋于U（5）极限.并且单粒子激发对区域偶偶核形状相变有重要影响.