关系符

A NF2 extended data model with object—oriented features is presented, and its semantics is formally described. The data model has the following features. Its database schema has NF2 extended structures, the data values can be either atomatic or composed by'set'and'tuple'constructors with a fixed order. The'table'concept unifies classes and relations.

该模型的主要特点有：数据库模式是扩展的非一范式结构，数据值既可以是原子的，也可以通过构造符set，tuple以特定的顺序反复复合而成；用表的概念统一了类和关系；对象标识既可以由用户定义，也可以由系统定义。

The results indicate that there is the significant linear correlation between the decoloration value and half-time and molecular descriptors, especially MW/S and number of azonic groups of azo dyes. Moreover, a QSPR model of azo dyes was achieved and used for calculation of predicted decoloration value and half-time of the dyes.

结果表明，染料分子结构描述符MW/S值、芳香环数目偶氮基数目和与I/O值与脱色率和半衰期之间存在着较好的线性相关性，其中MW/S值和偶氮基数目对脱色率和半衰期的贡献最为显著；所获得的QSPR定量关系模型可用于计算和估计水溶性阴离子偶氮染料的理论脱色率和半衰期。

Lots of investigators' interests, in the problem of an electron bound to a hydrogenic impurity and interacting with the longitudinal optical phonon field of an ionic crystal or a polar semiconductor, have been main- tained over years.

采用线性组合算符和么正变换方法研究强弱耦合情形下，库仑场中束缚光学极化子的基态能量、振动频率和平均声子数与温度的关系。

Second, projecting subjectification conditions within pedagogical processes (e.g.,"invisible power/knowledge relation within curriculum reform" and "code of Teacher-Build and symbol significance").

其次，运用主体化系谱学方法，反省「课程改革过程中不可见的知识／权力关系」以及「从国家机器工具转化为学习伙伴：教师图像的符码与时代象徵」等问题。

The purpose of constructing the model is to develop a simple, flexible and efficient parsing method without the need of formalizing the syntax rules on a large scale.

本文基于算符优先文法的汉语句法模型是建立在汉语二元运算关系的基础上的。

Furthermore, specific ritual foods, such as sticky rice and millet, are frequently manipulated to generate sensor y experiences and to objectify past images. In contrast to the rapid changes and constant conflict that characterize daily life, the Saisiyat dynamically re-construct social relations, transmit cultural values, and embody linkages with the past through reproducing and re-enacting food symbols in rituals.

藉由对赛夏食物的分析，本文一方面探讨食物符码，对人群关系界定和社会类别概念传递的作用；另一方面并进一步讨论赛夏人在仪式行动中，运用特殊食物衍生的具体意象和感官经验，跨越真实世界的时间流变，回溯过去并体现时间连结，形成记忆与认同建构的基础。

We make a rather thorough review of the QCD sum rule approach, which includes the correlation functions and the spectral representations, OPE, Borel transformation, the fixed point gauge, condensates and their empirical values, Borel stability, the dispersion relation and the commonly used

我们对于 QCD 求和规则作了比较全面的评述，包括：关联函数与谱表示；算符乘积展开；Borel变换和固定点规范；凝聚量及其经验值；Borel 稳定性；色散关系和谱密度的常用模型；Wilson 系数的计算；外场方法等。

Iconically, there is direct association between utterance politeness and social distance, so the degree of utterance politeness is relatively high on scales with increase of social distance and linguistic signs from the static view of linguistic form.

话语礼貌与社会距离存在象似关系，社会距离增大，语符增多，话语礼貌程度相对较高，但这只是不考虑语境生成的作用，静止地从语言形式本身来判断礼貌的程度，因而在语言的具体使用过程中，要动态地考虑交际生成语境。

Firstly, the elementary quantum-mechanical results for the harmonic oscillator in half space are carried out.

在本文中，我们首先对于半空间谐振子给出了包括位置、动量算符及其平方的矩阵元，定态上的不确定关系等等量子力学的基本结果。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失