Scaffolding learning by modelling: The effects of partially worked‐out models     

Yvonne G. Mulder  Lars Bollen  Ton de Jong  Ard W. Lazonder 《科学教学研究杂志》2016,53(3):502-523

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一个非等谱方程的Wronskian形式的混合解     

张大军 《上海大学学报(英文版)》2004,8(1):4-7

N-soliton solutions in the Wronskian form for the KdV equation with loss and nonuniformity terms were obtained. New rational-like solutions and mixed solutions were further derived. All these solutions were verified by direct substitutions into bilinear equation.  相似文献   

The influence of high-stakes testing on teacher self-efficacy and job-related stress     

Alejandro Gonzalez  Michelle L. Peters  Amy Orange  Bettye Grigsby 《Cambridge Journal of Education》2017,47(4):513-531

In the United States, teachers’ job-related stress and self-efficacy levels across all grades are influenced in some manner by the demands of high-stakes testing. This sequential mixed-methods study aimed at examining the dynamics among assigned subject matter, teacher job-related stress, and teacher self-efficacy in a large south-eastern Texas school district. Quantitative data were collected via the High Stakes Testing on Self-Efficacy and Teacher Stress Survey from a convenience sample of 145 teachers, while qualitative data were gathered during focus-group sessions at the elementary, middle and high school levels. Findings indicated that assigned subject matter did not influence teacher self-efficacy, but did influence teachers’ job-related stress. Additionally, a relationship was found to exist between teacher job-related stress and teacher self-efficacy. Teachers reported lack of time, modifications to curriculum, and testing of special education populations as contributions to their job-related stress, and school leadership and educational triage as impacting their teacher self-efficacy.  相似文献   

英语课堂“线上+线下”混合式教学思考与实践     

陈玉英 《天津教育》2021,(5):120-121

随着社会的发展,各种社交软件、网络化的教学软件随之出现,这给教师教学提供了极大的帮助。英语教师在教学中可以运用“线上”模式来丰富教学形式和内容,激发学生学习兴趣,进而使学生主动学习。本文主要分析了这种新型混合式教学方法所具备的优势,并阐述了在现阶段的英语教学中教师应如何开展此类教学,希望对现代英语教学的发展提供参考。  相似文献   

半序线性空间的分子结构     

王文良 《陕西理工学院学报(社会科学版)》2002,(3):8-12

给出数域F上线性空间的一类更一般的统一框架 ,即广义线性空间的概念 :设T是论域 ,F是数域 ,V(T) ={ρ｜ρ:T→F}, ρ ,σ∈V(T) , a∈F ,规定 ( ρ σ) (x) =ρ(x) σ(x) ,(aρ) (x) =a( ρ(x) ) ,则V(T)为F上的广义线性空间 .在该框架下引入半序关系 ,构造一类半序线性空间 (V ,≤ ) : α ,β ,γ ∈V , a∈F ,若α≤ β ,则1 )α γ≤ β γ且γ α≤γ β ;2 )当a≥ 0时 ,aα≤aβ,当a <0时 ,aβ≤aα .同时构造了分子概念 :格L中的元素a称为并既约元 ,若 x ,y∈L ,a=x∨y,则a=x或a=y ,L中非最小元的并既约元称为L中的分子 .并讨论其分子结构 ,从而为进一步探讨线性空间上的代数结构、序结构及拓扑结构的复合结构奠定理论基础  相似文献   

中国金融业混业经营趋势及风险分析     

李艳 《许昌学院学报》2005,24(3):124-127

开放的国际环境中，金融市场上的竞争，既是企业之间的竞争，更是不同体制的竞争。在金融服务综合化大行其道、混业经营已成主流的当今世界，我国的金融业虽说仍在分业经营的制度框架内运行，但银行、证券、保险诸业之间，已建构起多种形式的业务合作关系，初步形成了金融混业经营的态势。加快我国金融改革，尽快实现真正的金融混业经营，是一种历史的必然选择。受各方面条件制约，我国当前宜组建金融控股集团；同时，还应加强金融监管，建立严密的金融风险防范体系，以提高我国金融机构的竞争力，确保我国的金融安全。  相似文献   

Predoction Model of Data Envelopment Analysis with Undesirable Outputs     

边馥萍  范宇 《天津大学学报(英文版)》2004,10(1)

Data envelopment analysis (DEA) has become a standard non-parametric approach to productivity analysis, especially to relative efficiency analysis of decision making units (DMUs). Extended to the prediction field, it can solve the prediction problem with multiple inputs and outputs which can not be solved easily by the regression analysis method.But the traditional DEA models can not solve the problem with undesirable outputs,so in this paper the inherent relationship between goal programming and the DEA method based on the relationship between multiple goal programming and goal programming is explored,and a mixed DEA model which can make all factors of inputs and undesirable outputs decrease in different proportions is built.And at the same time,all the factors of desirable outputs increase in different proportions.  相似文献   

关于高维半线性热传导方程解的连续依赖性     

许兴业 《广东教育学院学报》2004,24(2):7-11

运用积分方法研究一类高维半线性热传导方程解的连续依赖性，证明高维半线性热传导方程混合问题的解在一定意义下关于自由项、初值和边值是连续依赖的．  相似文献   

Bearing Behaviors of Stiffened Deep Cement Mixed Pile   总被引：1，自引：0，他引：1  

吴迈  赵欣 《天津大学学报(英文版)》2006,12(3):209-214

A series of investigations were conducted to study the bearing capacity and load transfer mechanism of stiffened deep cement mixed (SDCM) pile. Laboratory tests including six specimens were conducted to investigate the frictional resistance between the concrete core and the cement soil. Two model piles and twenty-four full-scale piles were tested to examine the bearing behavior of single pile. Laboratory and model tests results indicate that the cohesive strength is large enough to ensure the interaction between core pile and the outer cement-soil. The full-scale test results show that the SDCM piles exhibit similar bearing behavior to bored and cast-in-place concrete piles. In general, with the rational composite structure the SDCM piles can transmit the applied load effectively, and due to the addition of the stiffer core, the SDCM piles possess high bearing capacity. Based on the findings of these experimental investigations and theoretical analysis, a practical design method is developed to predict the vertical bearing capacity of SDCM pile.  相似文献   

从青海考古发掘看古羌族文化与中原文化的融合     

刘杏改 《青海师范大学学报(哲学社会科学版)》2003,(3):46-49

羌族是世居青海的古老民族。羌族化距今已有三千多年的历史。西汉中叶，由于中原势力进入青海，中原汉化对羌族化产生了巨大影响，到东汉末年，羌族化基本上与中原化融合。  相似文献