代数偏微分方程组的对合特征集方法分析（英文）     

孟晓辉  陈玉福 《中国科学院研究生院学报》2006,23(1):7-22

基于Wu-Ritt特征集方法和V.Gerdt的对合除法, 我们定义了非线性偏微分方程组的关于一般延拓方向的对合特征集 (ICS). 影响ICS方法的两个主要因素为: 延拓方向和变量的序. 本文中, 应用ICS方法处理在计算偏微分方程组的对称群过程中产生的大型偏微分方程组. 在实验的基础上, 总结了对于ICS方法较好的延拓方向和变量的序.  相似文献   

唐山城乡居民消费对经济增长影响差异化的实证分析     

冬佳  刘岭 《科学与管理》2016,(6):64-68

作为多年来经济总量位居河北省第一位的唐山市,这几年国民经济得到了飞速发展,消费需求总量的逐步扩大在一定程度上对经济增长的拉动起到了举足轻重的作用。本文建立了城乡居民消费水平与唐山经济增长关系的误差修正模型,研究表明唐山城乡居民消费对其经济增长有正向拉动作用,城镇居民消费的拉动作用比农村居民的要大。因而,采取措施缩小城乡居民消费的差距,统筹二者的发展,是唐山完成两个"率先"的目标、建成全面小康社会不得不面对的问题。  相似文献   

浅谈思想道德修养课的教学特点     

侯鹏 《安阳工学院学报》2005,(6):143-145

思想道德修养课非常重要.任课教师必须深刻理解大学生思想道德修养课的思想性和科学性,并在此基础上形成自己的艺术特色,才能极大地调动莘莘学子们学习的积极性、主动性,使他们在愉快的环境中自觉地提高思想觉悟和道德修养.  相似文献   

Externalizing behavior problems and interest in reading as predictors of later reading skills and educational aspirations     

《Contemporary educational psychology》2017

This study examined the developments in children’s externalizing problems and interest in reading during their first four years of school (Grades 1–4) and investigated whether this development predicted the children’s Grade 6 reading skills and educational aspirations. Data comprised (1) teachers’ ratings of externalizing problems and children’s (N = 642; 43% girls) self-ratings of their interest in reading, collected between Grades 1 and 4, and (2) measures of reading fluency and comprehension, and children’s self-reports of educational aspirations, collected at Grade 6. First, latent growth modeling showed that a higher level of externalizing problems in Grade 1 was associated with a lower concurrent interest in reading. Second, a positive association between the initial level of interest in reading and a linear change in externalizing problems indicated that children with a lower interest in reading in Grade 1 were rated by teachers as exhibiting higher levels of externalizing problems, which nonetheless declined over the course of their first four years of school more than among other children. Third, a higher initial level of externalizing problems with a linear change in these problems across Grades 1–4 was a predictor of lower subsequent educational aspirations and poorer reading comprehension in Grade 6. Analysis of the indirect effects indicated that a higher level of externalizing problems was associated with a lower concurrent interest in reading, which, in turn, was related to poorer future reading fluency and lower educational aspirations. The findings imply that problem behaviors are interlinked with academic skill development and motivation across the first six years of school.  相似文献   

Identifying pathways of teachers’ PCK development     

Dirk S. Wongsopawiro  Rosanne C. Zwart  Jan H. van Driel 《Teachers and Teaching》2017,23(2):191-210

This paper describes a method of analysing teacher growth in the context of science education. It focuses on the identification of pathways in the development of secondary school teachers’ pedagogical content knowledge (PCK) by the use of the interconnected model of teachers’ professional growth (IMTPG).The teachers (n = 12) participated in a one-year action research project focused on their individual concerns related to teaching science. The use of the IMTPG revealed that teachers use different pathways of learning to develop different aspects of their PCK. For each PCK component, three distinct pathways could be identified, two of which clearly were associated with professional growth. When examining these two pathways in detail, it was found that (1) teachers learned about new instructional strategies and assessment methods mostly through literature reviews and discussions with peers and (2) teachers who analyzed and reflected on student learning as it happened in their classrooms developed understandings that helped them to select and apply instructional strategies to further promote student learning. Both the analytical method as well as the identification of the different developmental pathways help to better understand teacher development in the context of classroom practices.  相似文献   

Meeting the Great Challenge: What Growth-Oriented Writing of the 1960s and 1970s can Teach Us about Uniting the Individualistic and Social Aims of English Education     

Cori McKenzie 《Changing English: An International Journal of English Teaching》2017,24(1):91-102

This study explores the relationship between two values that sit at the heart of English education: a commitment to democratic citizenship and a commitment to fostering students’ personal growth. Some scholars have argued that these values are often at odds and the ‘great challenge’ of the field is to unite the individualistic and social goals of English education. The study explores the commensurability of these aims by considering the way they were united in the growth-oriented practitioner writing composed in the decade after the Anglo-American Seminar on the Teaching of English in 1966. To conduct the study, I examined English Journal articles written between 1968 and 1978 to see if articles that emphasised students’ personal growth also attended to the goal of democratic citizenship. The analysis shows that while it may be rare for advocates of the personal growth model to attend to students’ development as citizens, these goals are not inherently incompatible. I conclude with closing remarks on what this study suggests about how the field might meet the ‘great challenge’ of uniting the individualistic and social aims of English.  相似文献   

对皖南山区农业生产活动外部不经济性问题的思考     

张乐勤 《黄山学院学报》2007,9(1):102-104

贫困山区农业生产活动(如毁林培植茯苓、天麻、香菇、木耳,随意捕猎、采挖珍稀野生动植物等)对环境资源造成巨大压力。以生态破坏为代价的发展不仅不能解决贫困问题,反而会加剧贫困,导致恶性循环,探索纠正山区农业生产活动的外部不经济对策不仅具有经济上的必要性,而且是实现环境良性循环的前提条件。  相似文献   

Automated Latent Growth Curve Model Fitting: A Segmentation and Knot Selection Approach     

Katerina M. Marcoulides 《Structural equation modeling》2018,25(5):687-699

Latent growth curve models are widely used in the social and behavioral sciences to study complex developmental patterns of change over time. The trajectories of these developmental patterns frequently exhibit distinct segments in the studied variables. Latent growth models with piecewise functions for repeated measurements of variables have become increasingly popular for modeling such developmental trajectories. A major problem with using piecewise models is determining the precise location of the point where the change in the process has occurred and uncovering the related number of segments. The purpose of this paper is to introduce an optimization procedure that can be used to determine both the segments and location of the knots in piecewise linear latent growth models. The procedure is illustrated using empirical data in order to detect the number of segments and change points. The results demonstrate the capabilities of the procedure for fitting latent growth curve models.  相似文献   

心灵化的艺术世界--简论散文诗的审美特征     

廖安厚 《内江师范学院学报》2003,18(1):56-59

散诗作为一种独立的体，具有独特的美学品格，且是一个复合的结构系统。散诗最重要的审美属性是心理特性。章基于对散诗的这种整体观照，并通过一定的比较分析，揭示了散诗有别于诗歌和散的个性美学特征，即审美视角的内向性，形象构筑的意象化，“韵在骨里”的节律美。  相似文献   

国际技术转让合同适用最密切联系地法的依据     

蒋新苗  邱润根 《湖南师范大学社会科学学报》2004,33(6):68-72

适用当事人自主选择的法律是国际技术转让合同使适用最密切联系地法的前提条件。在当事人没有明确选择法律时，则适用与合同有最密切联系的法律。在转让技术所有权的合同中，转让方的习惯居所地法或营业地法是与合同有最密切联系的法律。在转让技术使用权的许可合同中，原则上技术保护国法是与合同有最密切联系的法律。但在保护国有多个时，技术主要利用地为保护国；在技术被许可给一个受让方在几个国家利用且都得到充分的利用时，被许可国法律为合同最密切联系的法律；在许可方和被许可方有相同惯常居所、营业地、中心管理地或国籍时，其共同的法律为合同最密切联系的法律；在许可合同明显与许可国有更密切的联系时，许可国法律为合同最密切联系的法律。  相似文献