第25届男篮亚锦赛前八强队员年龄、身高和技术指标比较分析

运用文献资料、录像观察、数理统计和对比分析等方法,对第25届男篮亚锦赛前八强运动员的年龄、身高和技术指标进行了比较分析.结果表明:与亚洲男篮前八强运动员相比,中国队在年龄上存在显著性差异(p＜0.05),身高方面不存在显著性差异(p＞0.05);在相同位置上,后卫的平均得分和抢断存在非常显著的差异(p＜0.01),其他...     

广州亚运会羽毛球男单决赛得失分对比分析

以广州亚运会羽毛球男单决赛的比赛录像为研究对象,采用观察、统计、比较分析、查阅文献资料等方法,对林丹和李宗伟的比赛技术进行统计,并对双方各场区的技战术运用特点和得失分情况进行比较分析.结果显示,两人在比赛中多数是采用通过重点控制网前为后场创造进攻机会的技战术打法.利用前场和后场技术向对方发起攻击是双方得分的主要手段,但更多的是靠对手出现失误来得分的,尤其是李宗伟的失误较多.指出了双方技战术打法的特点、优势和不足     

A comparison of the Medieval Warm Period, Little Ice Age and 20th century warming simulated by the FGOALS climate system model

To compare differences among the Medieval Warm Period (MWP), Little Ice Age (LIA), and 20th century global warming (20CW), six sets of transient and equilibrium simulations were generated using the climate system model FGOALS_gl. This model was developed by the State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences. The results indicate that MWP warming is evident on a global scale, except for at mid-l...     

Pollen evidence from Baode of the northern Loess Plateau of China and strong East Asian summer monsoons during the Early Pliocene

The red clay eolian sequence on the Chinese Loess Plateau (CLP) is an important archive for paleoclimate change from the late Miocene to Pliocene,and can provide significant information for the controversial problems of East Asian monsoon evolution and its forcing mechanism.In this study,we present a pollen record from Baode,northern CLP.The record shows four stages of paleoecological evolution.From 5.6-4.4 Ma,a forest steppe ecosystem developed under an extremely warm period with high seasonal precipitation.Since 4.4 Ma,a drier episode occurred,which prompted parkland landscapes to develop.During 3.5-3.05 Ma,the environment changed to a rather open steppe ecosystem with a much cooler and drier climate.After 3.05 Ma,the vegetation evolved to forest steppe.Using the percentages of arboreal plants to mirror precipitation,and comparing with other published pollen data from the CLP,we find the existence of S-N directionality of the precipitation change and high percentage of arboreal plants in the entire CLP during the Early Pliocene,which suggest the CLP was characterized by a strong East Asian summer monsoon.The strong summer monsoon corresponds well to the low global ice volume,which may illuminate global climate mechanism for the summer monsoon evolution in the early Pliocene.     

股票价格遵循O-U过程的几何型亚式期权定价

讨论了股票价格过程遵循指数O-U(ORNstein-Uhlenback)过程的几何型亚式期权的定价问题,利用鞅方法,给出了具有固定执行价格的几何平均亚式期权的定价公式.     

基于流固耦合理论的立式储液罐抗震数值分析

建立基于流固耦合理论的立式储液罐非线性数值模型,并在地震荷载作用下对其进行罐底提离机理探讨以及罐壁象足和钻石变形仿真分析。结果表明,考虑罐壁与液体、罐底与基础接触的模型是有效的,由于液体晃动产生的倾覆力矩作用使罐壁受拉侧罐底边缘倾向于脱离地基,形成罐底提离,从而导致罐壁象足变形的屈曲破坏。     

一种亚式重置期权的定价

亚式期权和重置期权都是路径依赖型期权,结合两种期权的特点,本文创设了一种新型期权,利用等价鞅方法,给出了新型变异期权在O-U过程下的定价公式.     

广西东盟国家语种教育探析

从语种分布、学历层次、行业知识的传授及办学条件等方面,分析了广西东盟国家语种教育发展中存在一些亟待解决的问题,并提出解决的建议。     

自然条件与华夏国家的萌芽

马克思所说"亚洲生产方式"并不涵盖古代中国。古代中国所处的地理环境与气候条件,决定了华夏国家在萌芽过程中,既有与亚洲其他国家的共性,也有自己的特征。其最基本的特征是华夏国家的多民族性。     

服从CEV的几何亚式期权的定价研究

首先阐述了一种新型期权——标准几何亚式期权的涵义及其模型 ,介绍了 CEV(波动率弹性为常数 )的涵义 ;然后提出了二叉树方法在服从 CEV的几何亚式期权定价中的应用 ;最后给出了实例分析 ,验证了这种二叉树方法的有效性和收敛性