独立反应数及独立反应式的确定     

李强国 《湘南学院学报》1997,(4)

本文根据线性代数的原理,阐述了复杂反应系统的独立反应数R及独立反应式的确定方法.  相似文献   

Numerical competence in young children and in children with mathematics learning disabilities   总被引：1，自引：0，他引：1  

Annemie Desoete  Jacques Grgoire 《Learning and individual differences》2006,16(4):351-367

A longitudinal study was conducted on 82 children to investigate, firstly the numerical competence of young children and the predictive value of (pre)-numerical tests in kindergarten, and, secondly, whether children's knowledge of the numerical system and representation of the number size is related to their computation and logical knowledge and to their counting skills. In an additional cross-sectional study on 30 children with a clinical diagnosis of mathematical learning disability (MLD) of 8,5 years, age- and ability-matched with 2 × 30 children the same parameters of numerical competence were assessed. The longitudinal data showed individual differences in numerosity, as well as the relationship between a delay in arithmetics in grade l and problems on numerosity in kindergarten. In the cross-sectional results some evidence was found for the independence of numerical abilities in MLD-children. About 13% of them had still severe pre-numerical processing deficits (in number sequence production, cardinality skills and logical knowledge) in grade 3. About 67% had severe difficulties in executing calculation procedures and a lack of conceptual knowledge. A feature of 87% of the MLD-children was severe translation deficits, with a significantly worse knowledge of number words compared with the knowledge of Arab numerals. Finally a severe deficit in subitizing was found to be present in 33% of the MLD children. On a group level the processing deficits were linked to understanding numerosity, since the ability-matched younger children and the MLD-children had the same pre-numerical and numerical profile. Implications for the assessment of mathematical disabilities and the value of TEDI-MATH® as an instrument in this process are discussed.  相似文献   

关于等厚干涉条纹数目的讨论     

张晓红 《廊坊师范学院学报(自然科学版)》2011,11(6):56-57

大学物理中,计算等厚干涉形成的条纹数目时,经常采用计算相邻两明(暗)纹的间隔数,然后条纹间隔数即等于条纹数。多年的教学实践表明采用上述方法计算明、暗条纹数,物理意义不很清晰,特别是学生不易掌握。文中提出了采用加强和减弱条件计算明、暗条纹数的方法,该方法意义明确,学生更易于接受。  相似文献   

P_n、C_n和S_n的r(2)点染色     

达文姣  任志国  屈宜丽 《甘肃高师学报》2011,16(2):12-13

提出了图的r(2)点染色的概念,研究了路Pn、环Cn、星Sn的r(2)点染色问题,并得到了它们的r(2)点色数.  相似文献   

支配数为2的图的最小特征值     

李小新  钱克仕 《池州学院学报》2011,(3):4-6

主要考虑简单图,其特征值定义为它的邻接矩阵的特征值.在所有给定阶数且支配数为2的连通图中,完全刻画了最小特征值达到极小的图.  相似文献   

C_n~2图的符号控制数     

丁丹军 《宜春学院学报》2012,34(8):21-23

设图G=G(V,E),令函数f:V→{-1,1},f的权w(f)=∑v∈Vf[v],对v∈V,定义f[v]=∑u∈N[v]f(u),这里N[v]表示V中顶点v及其邻点的集合。图G的符号控制函数为f:V→{-1,1}满足对所有的v∈V有f[v]≥1,图G的符号控制数γs(G)就是图G上符号控制数的最小权,称其f为图G的γs-函数。研究了C2n图,通过给出它的一个γs-函数得到了其符号控制数。  相似文献   

A 10 Year Collaboration—Still Going Strong,Ulrich's and ISSN     

《期刊图书馆员》2012,62(1-4):151-154

Collaboration between Ulrich's and the National Serials Data Program began more than ten years ago. Today the names have changed but this partnership continues to benefit publishers, libraries, and vendors who provide access to electronic serials. Many challenges are presented by differences in the metadata collected. A commitment to common goals and sharing metadata has made the partnership work.  相似文献   

Rumours     

ALAN KIMBER 《Teaching Statistics》1986,8(3):85-90

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人类科学中现有经典极限论的终结(Ⅲ)     

欧阳耿 《喀什师范学院学报》2007,28(6):16-21

进一步揭示、分析由于经典无穷观和经典数谱的缺陷所导致的存在于经典极限论中一个很隐蔽的逻辑矛盾,综合分析芝诺悖论家族和贝克莱悖论家族所揭示的问题的本质,得到明确的结论:(1)经典无穷理论体系、经典数谱和经典极限论这三大基础理论中所存在的缺陷导致了芝诺悖论家族和贝克莱悖论家族的产生,所以由这两大悖论家族从不同角度所揭示的所有难题在现有科学理论体系中是不可解的;(2)经典无穷理论体系、经典数谱和经典极限论中所存在的致命缺陷决定了人类科学中经典极限论的终结.  相似文献   

智能网号码携带业务的研究     

李波  张宇 《广东白云学院学刊》2005,(2):38-41

从上个世纪末到本世纪初，智能网技术得到了迅猛发展和广泛应用，它不但给成千上万的用户带来方便，而且为运营商带来了无限商机。本文以如何使用智能网技术实现号码携带业务为例，系统地介绍了智能网技术运用方法。  相似文献