Continuity of f-projections and applications to the iterative proportional fitting procedure*

This paper proves continuity of f-projections and the continuous dependence of the limit matrix of the iterative proportional fitting procedure (IPF procedure) on the given matrix as well as the given marginals under certain regularity constraints. For finite spaces, the concept of f-projections of finite measures on a compact and convex set is introduced and continuity of f-projections is proven. This result is applied to the IPF procedure. Given a nonnegative matrix as well as row and column marginals the IPF procedure generates a sequence of matrices, called the IPF sequence, by alternately fitting rows and columns to match their respective marginals. The procedure is equivalent to cyclic f-projections. If the IPF sequence converges, the application of the continuity of f-projections yields the continuous dependence of the limit matrix on the given matrix. By generalized convex programming and under some constraints, it is shown that the limit matrix of the IPF sequence continuously depends not only on the given matrix but also on the marginals.     

PSS码词组输入法及教学实践

本文介绍了PSS码（拼音、声调、首笔码）汉字输入法的词组编码及输入方法,并总结了PSS码作为一门选修课的教学效果。     

Trade and jobs in Europe: The role of mode 5 service exports

Over the past two decades, EU employment supported by extra‐EU exports of goods and services has increased markedly, with a shift towards jobs supported by services exported as part of manufactured goods. The authors seek further insight into this trend through the full decomposition of trade flows using a multi‐regional input–output model and the World Input–Output Database for 40 countries and 35 industries over the period 1995–2011. Their findings call for reflection by policy‐makers regarding the four traditional modes of service supply under the General Agreement on Trade in Services with a view to adequately capturing this new reality in global trade.     

反思性教学与外国语言学课程教改探索

本文论述了反思性教学的意义，并以一门英语专业研究生课程《功能语法》的语类分析课教学为例，论 述如何进行反思性实践，改变外语教学中存在的语言学理论输入和教学实践相脱节的现象，以培养出反思型的外国语言 学及应用语言学专业研究生。     

听觉加工对于词汇记忆作用的实验研究

该实验采用三种方式分别对词汇的记忆效果进行研究,即听觉输入和听觉加工方式、视觉输入和视觉加工方式以及视觉输入但听觉加工方式。结果发现:无论从即时测验的成绩来看,还是从延迟测验的成绩来看,使用视觉输入、听觉加工的方式都更有利于英文词汇的记忆和保持。     

词汇输入的“质”与英文写作

文章以英语教学实践为基础,探索了词汇搭配输入、多变性输入和创造性输入对英文写作的重要性.认为学生如果掌握了词汇的搭配、多变性及使用规律,大胆、富有创新地使用词汇,就可以在没有言语信号刺激下也能够进行语言思维和语言运用,这不仅可以提高英文写作水平,而且能够大大激发学生写作的积极性.     

通用的批数据录入程序设计

本文通过建立辅助数据库,将编程序所需要的参数与被编辑的数据库参数相分离,设计出一个通用的批数据录入程序.     

一种新的天綫阵方向图綜合方法

由于互耦的影响,天线阵中各单元的电流分布各不相同,因此,传统的综合方法不能得到满意的方向图;而矩量法综合阵方向图时对大阵需要极大的计算量,限制了它的适用范围。本文提出了一种综合偶极子天线阵方向图的方法,并用它得到了几个低副瓣方向图。由于较好地处理了互耦的影响,这种方法极大地节省了计算时间和存贮单元,并使激励源型式具有很大的灵活性。本文的方法特别适用于大阵的方向图综合。     

自由电子激光放大实验的准光腔毫米波信号注入器

本文提出了一种用旋转柱形三反射镜准光腔作为自由电子激光放大实验系统的毫米波信号能量注入器主体的注入装置。理论和实验研究表明,该注入器具有模式单一、注入效率高(49.3％)、单向传输性好(定向传输)和有良好的单色性等一系列显著的优点。     

克拉申语言输入说与外语教学

文章客观地介绍了美国语言学家克拉申教授在 80年代初期提出的“语言输入说”的主要观点及其理论基础。在此基础上 ,对目前我国的外语教学过程中的语言输入问题进行了探讨 ,并提出了相应的建议。