主位推进模式分析在医学英语语篇翻译中的应用

主-述位理论是功能语言学中的一个重要理论分支,而主位推进模式又是其中的一个主要组成部分。从语篇功能的角度,探讨主-述位理论中的主位类型,主位推进的不同模式等,并通过具体的语言素材,对病理介绍、药物说明书和医疗器械广告等不同类型的实用医学英语语篇中的主位推进模式及其在翻译中的作用进行分析,旨在帮助医学英语译者从语篇的角度整体把握译文的质量。     

等比数列应力条件下产品寿命的参数估计

通过讨论产品寿命服从指数分布的情况、等比数列应力加速寿命的分布函数及数学模型,给出了相对应的标准时间下的参数估计.     

The emergence of a learning progression in middle school chemistry

Previously, a small scale, interview‐based, 3‐year longitudinal study (ages 11–14) in one school had suggested a learning progression related to the concept of a substance. This article presents the results of a large‐scale, cross‐sectional study which used Rasch modeling to test the hypothesis of the learning progression. Data were collected from 4,450 students, aged 11–14, across 30 secondary schools in England using a computer‐based assessment instrument. The construction of the items was informed by the research literature on students' understanding in chemistry. One hundred seventy‐six fixed response items, in three formats, involving the use of video and animation were developed. Scored dichotomously, overall, the data show a good fit to the Rasch model. Item difficulties have a high degree of invariance across ability, schools, gender, and year group. Conceptually, when items are placed in order of difficulty, a coherent progression of ideas emerges which matches the expectations from the longitudinal study. The learning progression is presented. Independent, nationally standardized data allow tentative projection of student performance to the wider population in England. Implications for research and curriculum design are discussed. © 2011 Wiley Periodicals, Inc. J Res Sci Teach 48: 849–877, 2011     

An analysis of associations between residential and school mobility and educational outcomes in South African urban children: The Birth to Twenty cohort

Using data from Birth to Twenty, a cohort of South African urban children, the current paper investigates the relationships between residential and school mobility and a set of educational outcomes. The findings provide some evidence of a positive association between changes in residence and numeracy and literacy scores, and school mobility was found to be associated with grade repetition, however, no relationship was observed between changes in school and competency in numeracy and literacy. The South African study provides a counter example to trends observed in higher-income countries, while highlighting that associations are likely to be context specific.     

Comparing two types of model progression in an inquiry learning environment with modelling facilities

The educational advantages of inquiry learning environments that incorporate modelling facilities are often challenged by students’ poor inquiry skills. This study examined two types of model progression as means to compensate for these skill deficiencies. Model order progression (MOP), the predicted optimal variant, gradually increases the specificity of the relations between variables, whereas model elaboration progression (MEP) gradually expands the number of variables in the task. The study utilized a between-subject design with three conditions: a MOP condition (n = 28), a MEP condition (n = 26), and a control condition without model progression (n = 30). Consistent with expectations, model progression enhanced students’ task performance; a comparison among the two model progression conditions confirmed the predicted superiority of the MOP condition. These results are discussed in relation to the inconsistent findings from prior research. Based on this discussion ways to optimize model order progression are advanced.     

傅里叶变换教学方法探讨

针对信号与系统课程中傅里叶变换知识具有难于理解的特点,本文探讨在教学中需要注意的几个方面。教学实践表明,这些对正确理解傅里叶变换可以收到较好的教学效果。     

基于改进突变级数法的大学科技园绩效评价

大学科技园是高等学校产学研结合的重要平台,促进国家创新和区域经济,如何实现对大学科技园的绩效评价至关重要。在现有研究的基础上,采用基尼系数赋权和突变级数法构建基于改进突变级数法的国家大学科技园绩效评价模型,应用3种突变类型对65个国家级大学科技园的绩效进行综合评价,并根据评价结果分析当前大学科技园存在的问题和不足,为推动其健康持续发展提出政策建议,也为大学科技园的绩效评价提供一个新的思路。     

沙利·傅立叶的“和谐社会”思想研究

和谐社会是19世纪空想社会主义者所设计的理想社会的一个重要特征.其中,法国空想社会主义者沙利·傅立叶的"和谐社会"思想具有代表性.他围绕和谐社会提出一系列观点、看法,并付诸实践--成立了法郎吉社区.虽然今天看来空想社会主义的和谐社会思想还存在着许多不足,并且已经成为遥远的历史,但是对其进行分析和研究,对于我国正在构建的社会主义和谐社会具有重要的启示意义.     

沙利·傅立叶的“和谐社会”思想研究

和谐社会是19世纪空想社会主义者所设计的理想社会的一个重要特征。其中,法国空想社会主义者沙利·傅立叶的“和谐社会”思想具有代表性。他围绕和谐社会提出一系列观点、看法,并付诸实践——成立了法郎吉社区。虽然今天看来空想社会主义的和谐社会思想还存在着许多不足,并且已经成为遥远的历史,但是对其进行分析和研究,对干我国正在构建的社会主之和谐社会具有重要的启示意义。     

雷达信号的时——频分析和应用

针对常见的雷达脉冲信号（常规信号（NS）,线性调频信号（LFM）,双线性调频信号（DLFM）运用时频工具对调制方式的识别进行研究。运用两种时频分析方法1.短时傅里叶变换2.相位展开算法.通过这两种算法对雷达信号的调制方式进行分析,并通过仿真得到雷达信号的时--频分布以及时—频,时—相曲线,对仿真结果进行研究。通过仿真实验表明,雷达信号调制方式识别算法是可行的,有效的,而且具有良好的性能。