2,205 research outputs found
Pragmatic meta analytic studies: learning the lessons from naturalistic evaluations of multiple cases
This paper explores the concept of pragmatic meta‐analytic studies in eLearning. Much educational technology literature focuses on developers and teachers describing and reflecting on their experiences. Few connections are made between these experiential ‘stories’. The data set is fragmented and offers few generalisable lessons. The field needs guidelines about what can be learnt from such single‐case reports. The pragmatic meta‐analytic studies described in this paper have two common aspects: (1) the cases are related in some way, and (2) the data are authentic, that is, the evaluations have followed a naturalistic approach. We suggest that examining a number of such cases is best done by a mixed‐methods approach with an emphasis on qualitative strategies. In the paper, we overview 63 eLearning cases. Three main meta‐analytic strategies were used: (1) meta‐analysis of the perception of usefulness across all cases, (2) meta‐analysis of recorded benefits and challenges across all cases, and (3) meta‐analysis of smaller groups of cases where the learning design and/or use of technology are similar. This study indicated that in Hong Kong the basic and non‐interactive eLearning strategies are often valued by students, while their perceptions of interactive strategies that are potentially more beneficial fluctuate. One possible explanation relates to the level of risk that teachers and students are willing to take in venturing into more innovative teaching and learning strategies
Volatility Dynamics of the Tokyo Stock Exchange: A Sectoral Analysis based on the Multivariate GARCH Approach
Production of high stellar-mass primordial black holes in trapped inflation
Trapped inflation has been proposed to provide a successful inflation with a
steep potential. We discuss the formation of primordial black holes in the
trapped inflationary scenario. We show that primordial black holes are
naturally produced during inflation with a steep trapping potential. In
particular, we have given a recipe for an inflaton potential with which
particle production can induce large non-Gaussian curvature perturbation that
leads to the formation of high stellar-mass primordial black holes. These
primordial black holes could be dark matter observed by the LIGO detectors
through a binary black-hole merger. At the end, we have given an attempt to
realize the required inflaton potential in the axion monodromy inflation, and
discussed the gravitational waves sourced by the particle production.Comment: 6 pages, 5 figures, match the version accepted by JHE
Theoretical prediction of magnetic exchange coupling constants from broken-symmetry coupled cluster calculations
Exchange coupling constants (J) are fundamental to the understanding of spin spectra of magnetic systems. Here, we investigate the broken-symmetry (BS) approaches of Noodleman and Yamaguchi in conjunction with coupled cluster (CC) methods to obtain exchange couplings. J values calculated from CC in this fashion converge smoothly toward the full configuration interaction result with increasing level of CC excitation. We compare this BS-CC scheme to the complementary equation-of-motion CC approach on a selection of bridged molecular cases and give results from a few other methodologies for context
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