A pedagogical alliance for trust,wellbeing and the identification of errors for learning and formative assessment     

Jacqueline P. Leighton  María Clara Bustos Gómez 《教育心理学》2018,38(3):381-406

Formative assessments and feedback are vital to enhancing learning outcomes but require that learners feel at ease identifying their errors, and receiving feedback from a trusted source – teachers. An experimental test of a new theoretical framework was conducted to cultivate a pedagogical alliance to enhance students’ (a) trust in the teacher, (b) well-being in the learning environment and (c) identification of confusion and errors for the purpose of learning, assessment and feedback. A sample of 101 undergraduate students was randomly assigned to either an intervention (n = 51) or control (n = 50) condition in Elementary Statistics. Results indicated that a pedagogical alliance could be created to enhance student trust in the instructor, leading students to report greater well-being and a higher number of potential areas of confusion in their understanding of new content material relative to a control group. These results have implications for formative feedback, assessments, and by extension learning outcomes.  相似文献   

Coupled models of heat transfer and phase transformation for the run-out table in hot rolling   总被引：1，自引：0，他引：1  

Shui-xuan Chen  Jun Zou  Xin Fu 《浙江大学学报(A卷英文版)》2008,9(7):932-939

Mathematical models are been proposed to simulate the thermal and metallurgical behaviors of the strip occtLrring on the run-out table （ROT） in a hot strip mill. A variational method is utilized for the discretization of the governing transient conduction-convection equation, with heat transfer coefficients adaptively determined by the actual mill data. To consider the thermal effect of phase transformation during cooling, a constitutive equation for describing austenite decomposition kinetics of steel in air and water cooling zones is coupled with the heat transfer model. As the basic required inputs in the numerical simulations, thermal material properties are experimentally measured for three carbon steels and the least squares method is used to statistically derive regression models for the properties, including specific heat and thermal conductivity. The numerical simulation and experimental results show that the setup accuracy of the temperature prediction system of ROT is effectively improved.  相似文献   

Continuous frequency and phase spectrograms： a study of their 2D and 3D capabilities and application to musical signal analysis     

Laurent Navarro  Guy Courbebaisse  Jean-Charles Pinoli 《浙江大学学报(A卷英文版)》2008,9(2):199-206

A new lighting and enlargement on phase spectrogram （PS） and frequency spectrogram （FS） is presented in this paper. These representations result from the coupling of power spectrogram and short time Fourier transform （STFT）. The main contribution is the construction of the 3D phase spectrogram （3DPS） and the 3D frequency spectrogram （3DFS）. These new tools allow such specific test signals as small slope linear chirp, phase jump case of musical signal analysis is reported. The main objective is to and small frequency jump to be analyzed. An application detect small frequency and phase variations in order to characterize each type of sound attack without losing the amplitude information given by power spectrogram  相似文献   

Phase locking dynamics in 2D Josephson junction arrays with external load     

B. FrankW. Krech 《Journal of The Franklin Institute》2002,339(1):1-12

Phase locking in a basic two-dimensional hybrid Josephson junction array consisting of two rows and four columns shunted by an external load is investigated, exploiting an approximation combining the ideas of harmonic balance with that of the slowly varying phase procedure. Using small ring inductances, the junction voltages within the same row oscillate nearly in-phase unless the external magnetic flux in the loops is near a multiple of a quarter of the flux quantum. Without external load we have found a stable antiphase regime where both rows carry out uniform interferometer oscillations. A stable in-phase regime, favored in an optimized radiation source, can be reached by means of an external inductive shunt for small external fields only.  相似文献   

PTC法合成E-4,5-二取代苯基-2-吡咯烷酮     

郑可利 《三明学院学报》2001,18(3):32-34

采用PTC法合成了E-4,5-二取代苯基-2-吡咯烷酮,反式异构体与顺式异构体之比为973,产率高达74%,其结构用1HNMR和MS表征.  相似文献   

相转移催化合成疏基乙酸异辛酯     

Yang Haibl  et al. 《大连大学学报》1994,(1)

本文考察了相转移催化剂对合成疏基乙酸异辛酯产率的影响,并采用正交试验确定了反应的最佳操作条件。结果表明,在有相转移催化剂存在的最佳条件下,疏基乙酸异辛酯的产率明显提高,由原来的74％提高到95％。相转移催化剂不同时,反应所需的水解时间、水解温度、锌粉加入量、催化剂加入量等有不同的最佳值。这些结果的获得将明显提高工业生产疏基乙酸异辛酯的经济效益。  相似文献   

基于多维视角的高科技企业成长机制分析     

吴丹 《科学与管理》2016,(4):56-62

以高科技企业成长机制分析为主要内容,从高科技企业成长的动力因素、质量变化、能力体现和阶段演进等四个不同的维度视角,构建更为完善的高科技企业成长机制分析框架,系统剖析高科技企业成长因素作用机制。提炼影响高科技企业成长的关键要素与动力因素,反映高科技企业成长的质量变化,凸显高科技企业成长的能力体现,体现高科技企业成长的阶段演进。  相似文献   

有机物在相变贮热中的应用     

贺洛夫  阮德水 《湖南城市学院学报》1994,(6)

本文介绍了一些有机化合物在相变贮热中的应用研究情况。一些有机物本身是较好的贮热材料。一些有机物在贮热体系中可作增稠剂、晶习改变剂、晶体生长抑制剂和过冷稳定剂。  相似文献   

Performance of passive and reactive profiled median barriers in traffic noise reduction     

Mohammad Reza Monazzam  Samaneh Momen Bellah Fard 《浙江大学学报(A卷英文版)》2011,12(1):78-86

Median noise barriers, like parallel noise barriers, can be employed to reduce the impact of traffic on roadside communities via the direct propagation path. The performance of different shapes of median barriers was compared using reactive and passive surfaces and a 2D boundary element method (BEM). In the case of reactive surfaces, quadratic residue diffusers (QRDs) and primitive root diffusers (PRDs) were used on the top and stem surfaces of median barriers. To introduce passive barriers, two different absorbent materials including fibrous material and a grass surface with flow resistivity of 20 000 and 2500 kg/(s·m²), respectively, were similarly applied. The effect of thin absorptive barriers was similar at lower frequencies and better at mid and high frequencies to that of their equivalent rigid barriers. More improvement was achieved by covering the top surface of thick barriers with grass rather than with fibrous material. The performance of QRD and PRD barriers where the diffuser was located on the top surface was more frequency dependent than that of barriers coated with fibrous material. A comparison of the average A-weighted insertion loss in the thick barriers showed that the greatest improvement (2.59 dB (A)) was achieved using a barrier of 30-cm thickness covered with grass.  相似文献   

N-乙基溴化奎宁催化合成α-甲基-α-氨基酸     

黄国华  李洋 《海南广播电视大学学报》2011,(1):150-153

文章采用N－乙基溴化奎宁为相转移催化剂,以2－丁酮等为原料合成了几种α－甲基-α-氨基酸,并考察了2－丁酮和2－戊酮等不同反应原料、不同反应温度和不同反应时长下合成反应的收率,得出了较佳的反应条件。  相似文献