数学概念的理解问题     

徐伟  孙承毅 《鞍山师范学院学报》2003,5(6):28-31

对数学概念的理解问题是数学学习理论中的重要理论问题．就刻划数学概念理解的重要概念——数学概念的心理表征和数学概念理解的认知基础进行分析，从而对数学概念的理解问题有更深入的认识。  相似文献   

论艺术作品中具象与抽象意味的转换     

冉献东 《商丘师范学院学报》2006,22(1):175-176

具象与抽象是绘画的两种表现形式,具象中有抽象的存在,依托抽象提升再现具象的艺术性;抽象中有具象的基础,在再现具象的能力基础上升华出抽象意味。具象特征最强烈的写实绘画作品由于表现出非同凡响的对客观对象的意象感受,从自然中寻求最吸引人的形式元素,绘画本身有引导观者观看的信号;这时,写实具象作品就有了抽象的意味。最具抽象特征的表现性作品,往往由于摆脱内容的束缚,以形式的面貌走向自由王国,走向意念的深处,带给有共同经验的观者以心理上的真实和具象。所以抽象作品又有具象的意味。  相似文献   

Being sloppy about slope: The effect of changing the scale     

Orit Zaslavsky  Hagit Sela  Uri Leron 《Educational Studies in Mathematics》2002,49(1):119-140

What is the slope of a(linear) function? Due to the ubiquitous use of mathematical software, this seemingly simple question is shown to lead to some subtle issues that are not usually addressed in the school curriculum. In particular, we present evidence that there exists much confusion regarding the connection between the algebraic and geometric aspects of slope, scale and angle. The confusion arises when some common but undeclared default assumptions, concerning the isomorphism between the algebraic and geometric systems, are undermined. The participants in the study were 11^th-grade students, prospective and in-service secondary mathematics teachers, mathematics educators and mathematicians — a total of 124 people. All participants responded to a simple but non-standard task, concerning the behavior of slope under a non-homogeneous change of scale. Analysis of the responses reveals two main approaches, which we have termed ‘analytic’ and ‘visual’, as well as some combinations of the two.  相似文献   

Relationships among computational performance,pictorial representation,symbolic representation and number sense of sixth‐grade students in Taiwan     

Der‐Ching Yang 《Educational studies》2004,30(4):373-389

Twenty classes in ten schools with 627 sixth‐grade students in five cities in Taiwan participated in this study. The research provides information on the performance differences among written computation, pictorial representation, symbolic representation and number sense. The results of One‐way ANOVA analysis indicate that significant difference was found among WCT, PRT, SRT and NST tests, with F=536.327, p=0.000. The a posteriori comparisons show for each pair (WCT vs PRT, WCT vs SRT, WCT vs NST, PRT vs SRT and SRT vs NST) significant difference at the 0.001 level (p=0.000), except for the pair comparison between PRT and NST. This implies that these Taiwanese students were highly skilled in written computation but their written skills were not equally transferred to use of non‐computational paths that depended on symbolic representation, pictorial representation and number sense to solve similar problems.  相似文献   

中华民族共同体意识的社会心理机制研究     

陈永涌  任梓荣 《民族教育研究》2020,31(2):29-34

本研究以社会心理学为研究视角,分别从社会表征理论和话语分析两个层面阐述中华民族共同体意识的社会心理机制。具体而言,在社会表征理论层面,中华民族共同体意识作为中华民族特有的社会表征,是在各族人民交往交流交融的历史条件下、以锚定和物化为两种基本的社会认知机制,具有社会共享性和行为差异性、社会根源性和行为说明性、相对稳定性和长期动态性等特征;在话语分析层面,从中华民族共同体的话语解构、话语转变和构建话语体系三个方面分析,明确"中华民族共同体"的概念,区分"中华民族"和"中华民族共同体"的使用情境差异,促进"中华民族共同体"概念的具象化,提出构建中华民族共同体意识的话语体系要兼顾政治话语、学术话语和大众话语的统一。从社会心理视角探寻中华民族共同体意识形成和发展的机制,有助于从"心"出发,进一步铸牢中华民族共同体意识,开创中华民族更加灿烂美好的未来。  相似文献   

Multi-sensor image registration using multi-resolution shape analysis     

YUAN Zhen-ming WU Fei ZHUANG Yue-ting 《浙江大学学报(A卷英文版)》2006,7(4):549-555

INTRODUCTION Image registration plays an important role in the fusion of remote sensing, video panorama, medical image processing, etc. (Li et al., 1995; 2004; Brown, 1992; Belongie et al., 2001; Rui et al., 2001). More different than video panorama, the registration of multi-sensor image needs to align the multi-sensor images of the same scene from different sources (Rignot et al., 1991). Multi-sensor image registration is widely used in the fusion of panchromatic images with infrared i…  相似文献   

我国货币政策的数量效应与运行效果     

张青青 《株洲师范高等专科学校学报》2005,10(4):98-102

通过对我国货币政策的数量性效应进行简单分析．并使用Granger因果检验法和向量自回归模型对1984—2001年间货币供应量与物价、收入波动的关系进行考察后，研究发现我国货币政策的数量性效应总体是明显的。在长期内我国各经济主体对货币供给有较强的制约能力，货币供给受各经济主体的经济行为影响较大。这就导致中央银行对货币供给控制的难度加大，货币政策的效果可能被削弱。  相似文献   

Letter processing in reading and spelling: Some dissociations     

Brenda C. Rapp  Alfonso Caramazza 《Reading and writing》1989,1(1):3-23

We describe the complex pattern of spared and impaired performance observed in a neurologically impaired subject on a number of letter processing tasks including: written letter naming, alphabetization, matching across typecase and font, oral and written spelling to dictation, and across-case letter priming. The observed dissociation in performance between the naming of written letters and the naming of letters in oral spelling as well as the dissociation between oral spelling and written spelling are shown to support a model of letter processing in which a distinction is drawn between visuo-spatial and abstract levels of letter representation. We also describe symmetrical deficits in the reading and writing of letters. These can be understood: in reading, as the result of an impairment to the processes which mediate the conversion of visuo-spatial letter representations to abstract representations, and in writing, as a deficit to the processes which negotiate the apparently reverse operation. This finding is interpreted within the context of the notions of neural and functional proximity and we raise the possibility that processes which perform distinct computations may, nonetheless, share certain computational resources.Requests for offprints should be addressed to Brenda Rapp or Alfonso Caramazza. The research reported in this paper was made possible through the support of NIH (NINCDS) NS22202 and the Seaver Institute. We would like to express our appreciation to J. E. for his participation in this study and we thank Roberta Ann Goodman-Schulman and Cristina Romani for their helpful comments and Paul Mullin for his generous programming assistance.  相似文献   

论"三吏""三别"的叙事艺术     

储庆 《淮南职业技术学院学报》2004,4(2):78-79,82

杜甫的叙事诗在现实主义诗歌发展过程中占有继往开来的重要地位,他汲取了《诗经》、汉乐府的现实主义优良传统,对他所处时代的社会现状作了真实写照,开创了把现实生活高度艺术化的新风格;“三吏”、“三别”是其叙事诗的代表作,诗人在这组诗中通过典型化、寓情于物、个性化的人物语言、景物描写叙事化这些艺术手法写出了时代的悲剧、人民的痛苦。  相似文献   

Automatically extracting sheet-metal features from solid model     

刘志坚  李建军  王义林  李材元  肖祥芷 《浙江大学学报(A卷英文版)》2004,5(11):1456-1465

With the development of modern industry,sheet-metal parts in mass production have been widely applied in mechanical,communication,electronics,and light industries in recent decades; but the advances in sheet-metal part design and manufacturing remain too slow compared with the increasing importance of sheet-metal parts in modern industry. This paper proposes a method for automatically extracting features from an arbitrary solid model of sheet-metal parts; whose characteristics are used for classification and graph-based representation of the sheet-metal features to extract the features embodied in a sheet-metal part. The extracting feature process can be divided for valid checking of the model geometry,feature matching,and feature relationship. Since the extracted features include abundant geometry and engineering information,they will be effective for downstream application such as feature rebuilding and stamping process planning.  相似文献