NEW POSSIBILITIES BROUGHT ABOUT BY HYPERTEXT

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有限非空论域上串行的二元关系与近似算子的特征联系

本文推理，总结出了有限非空论域上特殊的二元关系与近似算子特征的联系，以便利用近似算子来讨论与二元关系相关的问题。     

Electronic structure and magnetism ofRMn6Sn6 (R=Tb, Dy)

This article reports first-principles band structure calculations forRMn₆Sn₆ (R=Tb, Dy). The calculation uses the linear muffin-tin orbitals (LMTO) method in the atomic-sphere-approximation (ASA), and yields results showing that both TbMn₆Sn₆ and DyMn₆Sn₆ are ferrimagnetic compounds with antiparallel aligned moments ofR and Mn atoms. In this research the 4f states ofR atoms are treated as localized states, i.e., the hybridization of 4f states with other valence electrons is neglected. The moments of Mn in both compounds were determined to be 2.43 μ_B and 2.38 μ_B, respectively. The considerably small additional moments for Mn from the spin-orbit coupling indicates that the spin-orbital coupling is not dominated for Mn atoms. The total moments of Tb and Dy atoms are 10.28 μ_B and 11.20 μ_B. All the calculation findings accorded well with experimental results. Project supported by the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry of China.     

Balance of multi-wavelets

1. Introduction A multi-wavelet is a wavelet generated by a multi-scaling function consisting of several functions. Multi-wavelets have some advantages in practical application over scalar wavelets because they possess all these properties such as short support, orthogonality, symmetry and higher approximation order at the same time. But in practical application the discrete scalar data need prefiltering when they are transformed by discrete multi-wavelets. Prefiltering makes some pro-perties …     

逐项逼近--普通话水平等级评定的主观性辅线

分析了普通话水平测试试卷各测试项目的相关度,并通过分析普通话教学过程中的一些普遍性的语言迁移规律,对普通话水平测试中的典型特征评价法作了初步探讨,揭示了普通话水平测试评级定等时逐项逼近和逐步验证这一主观性心理过程.     

一种基于小波域的音频水印嵌入方法

提出一种基于多尺度小波分解的音频水印算法．算法通过对小波域二层近似子带进行分段并实现水印嵌入．实验证明，该算法具有较好的透明性及鲁棒性，是一种较实用的音频水印算法．     

Ritz——Гaлёpkин有限元弱逼近

本文将强收敛意义下的Ritz—ГаπёкиΗ有限元法推广成弱收敛意义下的有限元逼近法,并将其化为投影逼近法.     

LDA和GGA泛函优化锐钛矿相TiO2结构比较

采用CASTEP软件对LDA（CA—PZ）泛函和GGA泛函（包括PW91、PBE、RPBE、WC）优化锐钛矿相TiO2结构进行了比较。结果表明WC泛函得到的结果偏差最小,最接近于真实晶体的情况;其优化过程波动性最小,收敛最快、优化效率最高。LDA优化的结果较真实值普遍偏低,和通常的认为一致。除了WC外,GGA泛函优化的结果较真实值普遍偏高,而且较LDA更偏离真实值,其优化过程收敛性和优化效率也不如LDA。     

Fourier级数线性求和算子列收敛的充要条件

讨论Fourier级数的线性求和算子列是收敛算子列的充要条件.     

双模激光场中电子-氩原子弹性散射

应用玻恩一阶近似理论,在电子入射方向平行于激光场的极化方向的特殊散射模式下,利用光学势模型研究了激光场中电子-氩原子散射问题。利用静电屏蔽势,应用第二玻恩近似公式对双模激光场中电子-氩原子散射进行了计算。在相位不同、散射截面出现关于ν=0对称和镜面对称的情况下,这个理论方法给出了较好的结果。