Local orthogonal transform for a class of acoustic waveguides

There are some curved interfaces in acoustic waveguides. To compute wave propagation along the waveguides with some marching methods, flattening of the internal interfaces is needed. In this paper, a local orthogonal coordinate transform and an equation transform are constructed to solve the two-dimensional Helmholtz equation for the waveguides bounded by a flat top, a flat bottom and two curved internal interfaces with three layered media. The curved internal interfaces are flattened by the local orthogonal coordinate transform, and the corresponding transformed Helmholtz equation can be solved by some marching methods. This treatment can be extended in multilayered medium waveguides. The one-way reformulation based on the Dirichlet-to-Neumann (DtN) map is then used to reduce the boundary value problem to an initial value problem. Numerical implementation of the resulting operator Riccati equation uses a large range step method to discretize the range variable and a truncated local eigenfunction expansion to approximate the operators. This method is particularly useful for solving long range wave propagation problems in slowly varying waveguides with multilayered medium structure.     

英语语调的副语言特征与话语理解

人类交际过程是一个复杂的过程。英语语调是一种副语言形式，不同的语调传递不同的信息和话语意义，表达不同的态度或情感，它具有特殊的交际功能与价值。本文主要探讨英语语调的副语言特征，帮助学生正确理解语调的话语功能，推断话语的真正含义。     

论科学语体、艺术语体言语表达的差异性

按语体学理论,服务于科学和艺术领域的语言体式可以划分为科学语体和艺术语体.在学界,人们往往关注它们的交叉性,却反把它们本有的差异性忽略了.这两类语体的差异性表现在思维和言语表达两个方面.     

论科学语体、艺术语体言语表达的差异性

按语体学理论,服务于科学和艺术领域的语言体式可以划分为科学语体和艺术语体。在学界,人们往往关注它们的交叉性,却反把它们本有的差异性忽略了。这两类语体的差异性表现在思维和言语表达两个方面。     

中文网络话语英语关键词的功能语法阐释

中文网络话语流行植入英语关键词，自主选择英语关键词轻松交流，全英文连贯表达似乎就不遥远。不同句子结构的英语关键词，在人际评价语言中表达情感态度、对事物概念进行识别和归类、把观点与观点进行语篇层次对接。功能语法阐释旨在强调英文是在使用英语以完成相应功能的过程中自然而然生成的。     

The Role of Context in Utterance Interpretation

This paper discusses the function of context in utterance interpretation.In speech communication,context plays a very important role in expressing utterance meaning appropriately and understanding that precisely.Context can be classified into three kinds,which is context of utterance,context of situation,and context of culture.Each has its own function in interpreting utterance.On one hand,the understanding of utterance-meaning relies a lot on the context,without which the utterance meaning cannot be fully interpreted.On the other hand,context gives some restrictions to the choice of utterance in a certain communication.Moreover,all the ambiguities of utterance can be cleared up through the context.     

数据集成系统中数据源描述的框架方法

查询重组是数据集成系统中必不可少的模块之一 ,关于数据源的内容以及它们之间联系的描述 ,是其首要任务 .在基于IA(InformationAgent)的数据集成系统中 ,可以利用多Agent系统中的匹配 (Matchmaking)机制来实现查询重组 ,本文首先给出在这种环境下查询重组模块的工作流程 ,然后提出一种知识表示中的框架来描述数据源和用户查询 ,以便系统高效地进行框架匹配和查询改写     

语境与话语的"互动"和"共变"

语境是一切话语的出发点,话语只有在一定语境的作用下才能产生交际效果,本文在探讨了传统语境和认知语境、语境和话语的相互关系的基础上,进一步探讨了语境和话语的“互动共变”机制。     

话语语用透明度初探

受语义透明度概念的启发,仿用语用透明度这个概念来分析英汉话语的语用含义,提出把握好话语的语用透明度是话语修辞的重要内容,是确保日常交际、跨文化交际能够成功的一个关键因素.它还是评定语用翻译译文质量的标准之一.     

Speech Situations and TEFL

This paper deals with how speech situations or rather speech implicatures affect TEFL.As far as the writ- er is concerned,they have much influence on many aspect of language teaching.To illustrate this point explicitly,the writer focuses on the influence of speech situations upon pronunciation,intonation,lexical meanings,sentence compre- hension and the grammatical study of the English language.