线切割电参数的合理选择     

陈德航 《四川职业技术学院学报》2006,16(2):115-116

分析了线切割参数对线切割加工工艺指标的影响,指明了怎样合理选择切割线参数。  相似文献   

Gender differences in performance in mathematics at the end of lower secondary school in Italy     

Mariagiulia Matteucci  Stefania Mignani 《Learning and individual differences》2011,21(5):543-548

The paper deals with the investigation of gender differences in performances in mathematics for Italian students at the end of lower secondary school. The study is based on a new large-scale assessment test developed and administered by the National Evaluation Institute for the School System. Given the evidence in the literature which favors males, performances of female and male students are compared using different approaches. Scores proposed by educational experts based on item subgroups were considered, while a model-based approach was used within item response theory. The results revealed a significant advantage to males in overall performance, while no meaningful differences were observed with respect to item domain and type. An interpretable item map was developed crossing expert opinions with IRT abilities, and plausible proficiency levels were defined. According to the map-based student classification, a relatively lower percentage of females fell into the highest proficiency groups with respect to males.  相似文献   

谈职业教育烹饪专业化学课程教学内容的选择     

卢美珍 《九江职业技术学院学报》2007,(1):48-49,47

本文通过现状分析和理论研究,提出了中等职业学校烹饪专业化学教学内容选择的原则.分析专业对化学知识的需求,着重讨论了职业学校化学课程与烹饪专业课程在内容上的衔接,本人对烹饪专业化学课程设计和内容选择进行了教学实践,取得了较好的效果.  相似文献   

企业并购中目标企业的选择及估价方法的探讨     

刘要红 《辽宁科技学院学报》2007,9(1):37-38

我国目前兼并市场的主流,主要是国有企业的有偿兼并和国有资产在国有单位之间的无偿划转.如何对并购进行选择,用什么样的方法进行选择就成为投资的一个重要课题.文章主要是从如何选择被兼并企业及其价值估价两大方面进行分析与研究.  相似文献   

Screening of phonological awareness in the early elementary grades: an IRT approach     

Vloedgraven JM  Verhoeven L 《Annals of dyslexia》2007,57(1):33-50

The purpose of the present study was to explore the possibilities for the assessment of growth in phonological awareness of children in kindergarten and first grade. Phonological awareness was measured using four sets of items involving rhyming, phoneme identification, phoneme blending, and phoneme segmentation. The results of an exploratory factor analysis and analyses conducted within the framework of item response theory showed one latent ability to underlie the different sets of items, which nevertheless differed in difficulty. Analyses in terms of the children’s ability further showed the phonological awareness measures to be sensitive to growth. The amount of information supplied by the different sets of items depended on the children’s level of ability. The conclusion that it is possible to accurately monitor the development of children’s phonological awareness in the early elementary grades appears to be justified, and this possibility opens up new perspectives for the early screening for reading problems and dyslexia.  相似文献   

中外田径短跨类项目项群演进特征的对比研究     

邬孟君 《贵州教育学院学报》2011,(9):54-58

结合田径运动自身的项群特点以及当今世界田径运动的发展趋势,以1999--2008年世界和中国历年年终排名前十位运动员的短跨类项目运动成绩为研究对象,运用文献法,数理统计法和比较分析法,通过对世界和中国田径运动10年内的这动成绩进行研究和对比,找出中国和世界田径运动发展存在的差异,总结规律,为中国田径运动的快速发展提供理论参考。  相似文献   

Development and Validation of a Multimedia-based Assessment of Scientific Inquiry Abilities     

Che-Yu Kuo  Tsung-Hau Jen  Ying-Shao Hsu 《International Journal of Science Education》2013,35(14):2326-2357

The potential of computer-based assessments for capturing complex learning outcomes has been discussed; however, relatively little is understood about how to leverage such potential for summative and accountability purposes. The aim of this study is to develop and validate a multimedia-based assessment of scientific inquiry abilities (MASIA) to cover a more comprehensive construct of inquiry abilities and target secondary school students in different grades while this potential is leveraged. We implemented five steps derived from the construct modeling approach to design MASIA. During the implementation, multiple sources of evidence were collected in the steps of pilot testing and Rasch modeling to support the validity of MASIA. Particularly, through the participation of 1,066 8th and 11th graders, MASIA showed satisfactory psychometric properties to discriminate students with different levels of inquiry abilities in 101 items in 29 tasks when Rasch models were applied. Additionally, the Wright map indicated that MASIA offered accurate information about students’ inquiry abilities because of the comparability of the distributions of student abilities and item difficulties. The analysis results also suggested that MASIA offered precise measures of inquiry abilities when the components (questioning, experimenting, analyzing, and explaining) were regarded as a coherent construct. Finally, the increased mean difficulty thresholds of item responses along with three performance levels across all sub-abilities supported the alignment between our scoring rubrics and our inquiry framework. Together with other sources of validity in the pilot testing, the results offered evidence to support the validity of MASIA.  相似文献   

对我国帆船、帆板运动项目发展的整体思考   总被引：4，自引：0，他引：4  

戴志强 《武汉体育学院学报》1998,(1)

本文认为,要尽快提高我国帆船、帆板的竞技水平,必须合理进行项目布局,改革训练与竞赛体制,建立科技先导型运动队。  相似文献   

论本科教学中题库建设的意义及质量评价体系     

陈晟  江昀  赖朋 《教育教学论坛》2015,(28)

本文结合作者在题库建设中的实际工作,对本科教学中的考试题库建设的意义、作用,以及题库建设中需要重视的难点做出了综述,并对题库的深入应用、题库的质量评价指标做出了探讨。  相似文献   

搜索引擎的选择与检索策略   总被引：8，自引：0，他引：8  

卢晓勤 《情报科学》2002,20(4):418-420

本文根据目前国内外搜索引擎研究状况，针对搜索引擎中出现的问题，提出了搜索引擎的选择方法，及利用技巧和策略。  相似文献