Coordinating multiple representations of polynomials: What do patterns in students' solution strategies reveal?     

《Learning and Instruction》2017

We investigate the strategies used by 64 advanced secondary mathematics students to identify whether a given pair of polynomial representations (graphs, tables, or equations) corresponded to the same function on an assessment of coordinating representations. Participants also completed assessments of domain-related knowledge and background skills. Cluster analysis of strategies by representation pair revealed patterns in the participants' strategy use. Two clusters were identifiable on tasks that required matching equations to graphs and graphs to tables. We identified overlap between these two clusters, suggesting that while the representation pair influenced strategy choice, there was also a general distinction between students who used more and less sophisticated strategies. However, students who used more sophisticated coordination strategies were similar to the others on measures of domain-specific knowledge or background skills. We consider implications for future investigations testing interventions to promote coordinating representations.  相似文献   

论党的三代领导核心与从严治党     

张广鑫 《辽宁师范大学学报(社会科学版)》2002,25(2):4-6

中国共产党的历史同时是常不断加强自身建设的历史。从严治党是我们党的一贯方针。以毛泽东、邓小平、江泽民为核心的党的三代领导,虽因处在不同的历史时期,围绕党的中心任务进行党的建设的主题不同,但其党的建设的思想原则是一脉相承,就是“党要管党,从严治觉”。  相似文献   

“三个代表”重要思想的理论和实践     

汪华岳 《滨州学院学报》2001,17(1):5-8

学习“三个代表”的重要思想 ,必须坚持理论联系实际的马克思主义学风。要深入把握“三个代表”重要思想的理论根据和实践根据 ,更要研究怎样切实有效地实践“三个代表”。  相似文献   

深刻把握“三个代表”重要思想的哲学基础   总被引：1，自引：0，他引：1  

冯国桢 《青海师范大学学报(哲学社会科学版)》2003,(4):33-37

江泽民同志提出并系统阐述的“三个代表”重要思想，是我们党的立党之本，治国之基，力量之源，是当代中国马克思主义理论发展的最新成果。本探讨了“三个代表”重要思想形成的新的实践基础，分析了这一重要思想是在我们党和国家所面临的伟大历史转折时期，在复杂多变的国际形势的特定历史背景下形成的。章还探讨了“三个代表”重要思想立论的哲学基础。  相似文献   

Spoken vocabulary growth: Its role in the development of phoneme awareness and early reading ability     

Walley  Amanda C.  Metsala  Jamie L.  Garlock  Victoria M. 《Reading and writing》2003,16(1-2):5-20

In this paper, two theoretical positionsregarding the developmental origins of thephoneme as a unit for lexical representationand processing are outlined – theaccessibility and emergent positions. OurLexical Restructuring Model (Metsala & Walley1998), which is consistent with the secondposition, focuses on the role of vocabularygrowth in prompting the implementation of morefine-grained, segmental representations forlexical items in childhood; this restructuringis viewed as an important precursor to theexplicit segmentation or phoneme awarenessskills implicated in early reading success.Empirical evidence that supports this model issummarized, including preliminary results fromone of our most recent studies. Severalsuggestions are made for future research thatwill lead to a better understanding of thedevelopment of spoken word recognition and thelinks between speech- and reading-relatedabilities.  相似文献   

黔南布依族地区中学生“宏观-微观-符号”三重表征调查研究     

邢焰  易丽莎 《黔南民族师范学院学报》2011,(6):83-88

＂宏观-微观-符号＂三重表征是化学学习中特有的思维方式,它有助于学生对化学知识的理解,优化学生的化学知识结构。本研究采用问卷调查等方法,对黔南布依族中学生的三重表征水平进行调查和分析,发现这个地区的中学生的三重表征思维方式十分有限。  相似文献   

《红楼梦》中的拟陈述     

李悦 《海南师范大学学报(社会科学版)》2011,24(2):101-104

真正优秀的文学作品不应该是一种实在的陈述,而应该是一种拟陈述。所谓拟陈述是指字面上讲的是某种事物,其实作者讲那事物只是一种由头,真正想讲的却是另外一种意味。《红楼梦》整体是拟陈述式的。它的局部的许多故事、意象、情节、细节等等也是拟陈述式的。实在的陈述只是《红楼梦》的表层意象,读出拟陈述的意味才触及到《红楼梦》的深层意味。  相似文献   

A pipelined architecture for distributed text query evaluation   总被引：1，自引：0，他引：1  

Alistair Moffat  William Webber  Justin Zobel  Ricardo Baeza-Yates 《Information Retrieval》2007,10(3):205-231

Two principal query-evaluation methodologies have been described for cluster-based implementation of distributed information retrieval systems: document partitioning and term partitioning. In a document-partitioned system, each of the processors hosts a subset of the documents in the collection, and executes every query against its local sub-collection. In a term-partitioned system, each of the processors hosts a subset of the inverted lists that make up the index of the collection, and serves them to a central machine as they are required for query evaluation. In this paper we introduce a pipelined query-evaluation methodology, based on a term-partitioned index, in which partially evaluated queries are passed amongst the set of processors that host the query terms. This arrangement retains the disk read benefits of term partitioning, but more effectively shares the computational load. We compare the three methodologies experimentally, and show that term distribution is inefficient and scales poorly. The new pipelined approach offers efficient memory utilization and efficient use of disk accesses, but suffers from problems with load balancing between nodes. Until these problems are resolved, document partitioning remains the preferred method. Alistair Moffat was supported by the Australian Research Council, the ARC Special Research Center for Perceptive and Intelligent Machines in Complex Environments, and the NICTA Victoria Laboratory. William Webber and Justin Zobel were supported by the Australian Research Council. Ricardo Baeza-Yates was supported by Grant P01-029-F from Millennium Initiative of Mideplan, Chile; and by the University of Melbourne as a visiting scholar at the time this project was undertaken.  相似文献   

Inter-ethnic preferences and ethnic hierarchies in the former soviet union     

Louk Hagendoorn  Rian Drogendijk  Sergey Tumanov  Joseph Hraba 《Int J Intercult Relat》1998,22(4):1017

One-thousand two-hundred and ninety university students from twenty-seven ethnic?national groups across six locations in the former Soviet Union (Novopolotsk in Byelorussia, Kharkov in the Ukraine, Moscow and Nizniy Novgorod in Russia, Ufa in the Bashkir Autonomous Republic and Ulan-Ude in the Buryat Autonomous Republic) participated in 1991–1992 in a survey investigating the existence of ingroup preference in inter-ethnic contact, ingroup consensus on an ethnic hierarchy of outgroups and the measure of intergroup consensus on an ethnic hierarchy among the ethnic?national groups in each location. Hypotheses about ingroup preference, ethnic hierarchies and consensus were derived from realistic group conflict theory, social identity theory and from the assumption that outgroup preferences reflect considerations of the status effects of intergroup contact. It appeared that the last type of hypothesis could explain most of the results.  相似文献   

The Efficacy of Using Diagrams When Solving Probability Word Problems in College   总被引：1，自引：1，他引：0  

Brian D. Beitzel  Richard K. Staley 《Journal of Experimental Education》2015,83(1):130-145

Previous experiments have shown a deleterious effect of visual representations on college students’ ability to solve total- and joint-probability word problems. The present experiments used conditional-probability problems, known to be more difficult than total- and joint-probability problems. The diagram group was instructed in how to use tree diagrams to solve conditional probability problems; the equation-only group was instructed only in the formulation of equations. Results indicated that the diagram group outperformed the equation-only group on a posttest of 10 near- and far-transfer problems given immediately and as long as 1 week later (Experiment 2). In addition, when rating their experience with the training phase the equation-only group reported significantly higher levels of frustration and lower levels of perceived success than the diagram group.  相似文献