包头市非公有制经济的现状及对策

我们所构建的社会是生产发展、富裕文明的和谐社会，经济增长是实现这一目标的关键，实现“富裕包头”是构建包头和谐社会的物质基础。“十五”期间，包头市经济快速增长、社会稳定、民族团结。其中非公有制经济的发展发挥了重要的作用。非公有制经济的长足发展已经成为当地经济发展的主要支撑。但是，在整体发展的态势下，仍然存在阻碍非公有制经济发展的种种因素。“十一五”期间，伴随全面落实西部大开发战略，包头市国民经济实现跨越式发展，非公有制经济的发展也步入了新的发展平台，我们应努力扫除障碍、积极寻找对策，进一步发挥非公有制经济的积极作用，加快推进经济强市进程的步伐，构建包头富裕、文明的和谐社会。     

从非线性振动看混沌的特性

通过对不同条件下非线性振动系统的讨论，揭示了混沌的基本特性。     

济阳拗陷非烃类气藏（CO2、He）的成因探讨

济阳坳陷是在古生代克拉通背景上形成的陆内拉张盆地；坳陷内的非烃类气藏分布于高青—平南深断裂中南段和阳信次级凹陷西北缘及商店火山岩穹隆构造内。ＣＯ２含量为６８．８５～９８．５９％，Ｈｅ含量为（８４～８４７）×１０－６，ＣＯ２与Ｈｅ呈弱的正相关。ＣＯ２的δ１３Ｃ值为－６．３０‰～－３．３５‰，表明ＣＯ２为无机成因。３Ｈｅ／Ｈｅ的比值为（２．８０～５．２２）×１０－６，表明Ｈｅ来源于地壳和地幔。研究表明非烃类气藏中的ＣＯ２主要为来自地球深部的幔源ＣＯ２，Ｈｅ为壳源与幔源的混合成因     

New evidence on the relation between return volatility and trading volume

In the empirical literature, it has been shown that there exists both linear and non‐linear bi‐directional causality between trading volumes and return volatility (measured by the square of daily return). We re‐examine this claim by using realized volatility as an estimator of the unobserved volatility, adopting a stationary de‐trended trading volume, and applying a more recent data sample with robustness tests over time. Our linear Granger causality test shows that there is no causal linear relation running from volume to volatility, but there exists an ambiguous causality for the reverse direction. In contrast, we find strong bi‐directional non‐linear Granger causality between these two variables. On the basis of the non‐linear forecasting modeling technique, this study provides strong evidence to support the sequential information hypothesis and demonstrates that it is useful to use lagged values of trading volume to predict return volatility. Copyright © 2009 John Wiley & Sons, Ltd.     

高功率密度液压冲击器输出性能参数的确定

在介绍应用于液压驱动的非开挖地下穿孔机的主要部分－高功率密度液压冲击器的工作原理基础上，介绍了高功率密度液压冲击器输出性能参数确定。