物理课堂教学实施素质教育的探讨     

余春日 《巢湖学院学报》2003,5(3):54-59

中学物理课堂教学如何实施素质教育，这是广大物理教师进行教学改革亟待解决的综合性很强、操作难度很大的课题。从转变教育观念、挖掘教育要素、改革教学模式、优化教学过程等十个方面作了探讨，以期对中学物理教学起到抛砖引玉的作用。  相似文献   

网络环境中海外华文教学过程和模式研究     

熊玉珍 《开放教育研究》2007,13(6):55-58

网络技术的应用是优化华文教学过程的新的切入点,它不仅仅是教育媒体的改变,还带来学生语言交际训练方式教育内容、传播方式、教师和学生角色以及教学模式的变革。通过教学实践探索,本文指出基于网络环境的华文教学过程要围绕一个主要目的、强化两种设计、重视三种交互和培养四种能力。  相似文献   

Time-Varying Effect Sizes for Quadratic Growth Models in Multilevel and Latent Growth Modeling     

Alan Feingold 《Structural equation modeling》2019,26(3):418-429

Multilevel and latent growth modeling analysis (GMA) is often used to compare independent groups in linear random slopes of outcomes over time, particularly in randomized controlled trials. The unstandardized coefficient for the effect of group on the slope from a linear GMA can be transformed into a model-estimated effect size for the group difference at the end of a study. Because effect sizes vary nonlinearly in quadratic GMA, the effect size at the end of a study using quadratic GMA cannot be derived from a single coefficient, and cannot be used to estimate effect sizes at intermediate time points with backward extrapolation. This article formulates equations and associated input commands in Mplus for time-varying effect sizes for quadratic GMA. Illustrative analyses that produced these time-varying effect sizes were presented, and a Monte Carlo study found that bias in the effect sizes and their confidence intervals was ignorable.  相似文献   

Constructing a new KS3 curriculum at Brooke Weston CTC: a review and commentary     

Andrew Campbell  Trevor Kerry 《Educational studies》2004,30(4):391-408

This paper reviews changes to the key stage 3 curriculum at a leading comprehensive school. The nature and practical concerns of the changes are described. These move beyond a fresh approach to content; they include issues about engaging students actively in learning for the future, planning around the school's distinctive ethos and expertise in ICT, and using curriculum as a vehicle for providing energy for new staff and heads of department to engage in learning leadership. Theoretical models of curriculum are examined to locate thinking at Brooke Weston CTC in a conceptual framework. The paper suggests that futuristic curriculum development resonates with some classical curriculum models that have been ignored over the past two decades of the National Curriculum.  相似文献   

Using an analogy to model causal mechanisms in a complex text     

Clement  Catherine A.  Yanowitz  Karen L. 《Instructional Science》2003,31(3):195-225

Two experiments examined the role of analogy inthe development of a situation model of atarget passage. Specifically, we examinedwhether an analogous source text could improvecomprehension and inferencing about causalmechanisms in the target. An ``analogy group'studied a fictional pseudo-scientific passageunder the guidance of an analogous passage(also fictional) which shared causal structureswith the target. A ``statement group' studiedthe target under the guidance of an abstractstatement that characterized the target causalstructures. A ``target-only group' received noadditional material. All groups received tasksthat assessed their representation of thetarget. In Experiment 1 (N = 92) participantswere asked to list the most important objectsand relations in the passage. In Experiment 2(N = 80) participants were directly asked aboutthe target causal structures. In bothexperiments, responses of analogy subjects weremore likely to include given and inferredinformation that comprised the target causalmechanisms. Analogies in which a sourcepassage models causal mechanisms correspondingto those of a target passage appear to promotebetter representation of the details of targetcausal mechanisms, allowing a more fullydeveloped situation model of the target.  相似文献   

长江水质的评价与预测模型     

邢红卫  程抒曼  余小艳 《内江师范学院学报》2006,21(6):32-34

讨论了长江水质的评价与预测问题,分析过去10年主要统计数据,分别用指数法,优化模型,二阶线性差分方程模型,对长江水质进行了评价与预测．同时也就长江水质污染问题提出了可行的建议与意见,最后对预测结果进行了误差分析,并对模型进行了评价与推广．  相似文献   

实现ArcGIS环境下的确认性空间数据分析功能     

杨海军  应龙根 《南京晓庄学院学报》2007,23(3):68-76,81

在地理信息科学领域,空间分析扮演着中心的作用.但目前的地理信息系统商业软件中,空间分析功能仍是一个薄弱环节;即便是美国ESR I公司的ArcGIS,其空间分析模块也仅仅局限于探索性空间数据分析的功能,从而极大地限制了地理信息系统作为空间决策支持平台的作用.本研究的目标便是解决这一问题.我们经过反复实践实现了ArcGIS环境下的确认性空间数据分析功能,包括古典线性回归模型和空间计量经济学模型的标准诊断、估计、以及可靠性检测的复杂算法.通过对ArcGIS的二次开发,真正实现了地理信息系统和空间分析功能的全面集成.  相似文献   

Analyzing the Interdependence Between Some Certain Gene Loci by Epistasis Measures in Fitness Landscapes of Schemata     

李建武  李敏强 《天津大学学报(英文版)》2003,9(1):63-67

GA-hardness and interdependence between genes in the chromosome are important questions in the study of genetic algorithms (GA) ,Traditional methods,which are used to measure the interaction between genes,can only reflect the extent of epistasis between all genes in the chromosome, Therefore,the definition of the fitness landscape of schemata is proosed in this paper,and epistasis measures on this landscape of schemata are used to analyze the degree of interdependence between some certain gene loci in study ,Some information between these sites can be reflected by some characters of the fitness landscape of schemata which are composed of these fixed sites,The stronger the interaction between these sites,the larger the variation of the fitness of schemata whose fixed sites correspond to those sites in study ,and the more rugged the fitness landscape of these schemata,According to the degree of interaction between given gene loci ,building blocks of GA can be analyzed and determined,and further genetic operators and the structure of GA can be designed and adjusted to improve the perfomance of GA ,At last,a lot of experiments including NK-models are done,and results of empirical analysis show that this method is effective.  相似文献   

A New Perspective on the Effects of Covariates in Mixture Models     

Gabriela Stegmann  Kevin J. Grimm 《Structural equation modeling》2018,25(2):167-178

In this simulation study, we explored the effect of introducing covariates to a growth mixture model when covariates were also generated by a mixture model. We varied the association between the latent classes underlying the growth trajectories and the covariates, the degree of separation between the latent classes underlying the covariates, the number of covariates included, and amount of missing data in the growth data. We found that adding covariates to the growth mixture model generally hurt class recovery except where the latent classes underlying the growth trajectories and the covariates were the same or very strongly associated, and there was a large degree of separation between the classes underlying the covariates. We found that when covariates were introduced, entropy might no longer be an accurate indicator of the distinctiveness of the growth trajectory classes.  相似文献   

Simple shear endochronic eqiations for finite plastic deformation     

JlANG Wugui  FU Mingfu  CHEN Liangsen  GENG Shiqi 《重庆大学学报(英文版)》2004,3(1)

The endochronic equations proposed by Valanis (1980) were extended to a finite deformation range. Jaumann's rate,Fu's rate and Wu's rate were incorporated into the endochronic equations to analyze simple shear finite deformation. Incremental equations and numerical solutions are deduced for three endochronic objective models. The results show that an oscillatory shear stress response to a monotonically increasing shear strain occurs when the Jaumann's rate objective model is employed for endochronic materials. The oscillatory response is dependent on the adopted objective rate. Compared with the Jaumann's rate, the Fu's rate and the Wu's rate satisfy the restrictions to elastic-plastic constitutive relations and are in agreement with the experimental results.  相似文献