Papers by Michael Vallance
Online Self-Regulated Learning and Achievement in the Era of Change
Journal of Educational Computing Research, Jun 29, 2021
As education is remodelled to online solutions, instructors and students are required to adapt th... more As education is remodelled to online solutions, instructors and students are required to adapt their teaching and learning through different forms of monitoring, regulation and assessment. This remodelling requires conceptual and philosophical reflection relating to stakeholder roles and the relationship between learners and teaching materials within digital learning spaces. With a sample of 276 student participants, this article reports from a Japanese university which shifted all regular face-to-face lectures online at short notice during 2020. Self-regulated learning is drawn from to test a primary thesis that online self-regulated learning impacts achievement. It was hypothesized that metacognitive skills provide the foundation for online self-regulated learning but are not able to exert a direct effect on achievement as such skills must be mediated through applied behavioral action. Three criterion models indicated limited achievement effect sizes between 11.1% and 12.6%. The outcomes are discussed in relation to online learning and pedagogies relevant to distance education in the era of change.
Biofouling, Apr 1, 2003
Model silicone foul-release coatings with controlled molecular architecture were evaluated to det... more Model silicone foul-release coatings with controlled molecular architecture were evaluated to determine the effect of compositional variables such as filler loading and crosslink density on pseudobarnacle attachment strength. Pseudobarnacle adhesion values correlated with filler loadings in both condensation and hydrosilylation-cured silicones. Variation of crosslink density of hydrosilylationcured silicones had an insignificant effect on attachment strength. X-ray photoelectron spectroscopy (XPS) indicated that the mode of failure upon detachment of the pseudobarnacle was dependent upon the crosslink density; samples with high crosslink density failed cohesively within the silicone.
There is no consensus regarding a common set of metrics for robot task complexity in associated h... more There is no consensus regarding a common set of metrics for robot task complexity in associated human-robot interactions. This paper is an attempt to address this issue by proposing a new metric so that the educational potential when using robots can be further developed. Tasks in which students in Japan and UK interact in a 3D virtual space to collaboratively program robots to navigate mazes have resulted in quantitative data of immersion, circuit task complexity and robot task complexity. The data has subsequently been collated to create a proposed new metric for tasks involving robots, which we have termed task fidelity. The paper proposes that task fidelity is a quantitative measure of a set robot task in relation to a learner's solution. By quantifying task fidelity educators utilising robots in schools and in higher education will be able to provide tasks commensurate with the expected successful outcomes achieved by the learners
Developing an Accessible Evaluation Method of VR Cybersickness
IEEE Conference on Virtual Reality and 3D User Interfaces, 2019
Despite its growing popularity, Virtual Reality (VR) has yet to make a significant impact in conv... more Despite its growing popularity, Virtual Reality (VR) has yet to make a significant impact in conventional education due to its high cost, unconvincing learning data, complexity of the technologies and, persistently, cybersickness. To alleviate this dilemma, it is necessary to develop a straightforward and reliable measurement of cybersickness for VR application developers and mainstream educators. The Empatica E4 wearable device and its eco-system were utilized to record Heart Rate Variability (HRV) and Electrodermal Activity (EDA) during customized computer-based and VR tasks with 16 participants. The metrics of S, NNMean, SDNN, RMSSD, and Poincaré Plot in HRV data and SCR width in EDA data were found to be potential indicators of cybersickness. Further research aims to determine a specific cybersickness index.
Viscoelastic response of unidirectionally reinforced thermoplastic composites to off axis deformation
Polymer Composites, 1987
Page 1. Viscoelastic Response of Unidirectionally Reinforced Thermoplastic Composites to Off Axis... more Page 1. Viscoelastic Response of Unidirectionally Reinforced Thermoplastic Composites to Off Axis Deformation GAYLE D. TOMKINSON and MICHAEL A. VALLANCE Polymer Physics and Engineering Branch Corporate Research ...
Dielectric spectroscopy at sub-audio frequencies—two techniques in comparison
Review of Scientific Instruments, 1980
Two dielectric spectrometers for use at sub-audio frequencies have been designed around a digital... more Two dielectric spectrometers for use at sub-audio frequencies have been designed around a digital microcomputer and data acquisition system. In one technique the driving signal and the current response are harmonic. In the other technique a current transient results from a voltage step. Comparison of the two techniques on real materials reveals good agreement between complex relative permittivity spectra. Moisture and electrode polarization aspects of specimen preparation are addressed.
Journal of The Electrochemical Society, 2015
The response to open-circuit interrupts of porous mixed iron-nickel cathodes operating in NaCl-bu... more The response to open-circuit interrupts of porous mixed iron-nickel cathodes operating in NaCl-buffered, molten NaAlCl 4 electrolyte has been characterized as a function of state of charge (SOC) for different iron loadings and different charge and discharge rates. After discharge, the open-circuit potential (OCP) can evolve in time from the iron plateau to the nickel plateau, and this behavior can be explained by galvanic interactions between iron metal and Ni 2+ . Characteristic times of the OCP transients depend on SOC and can be large. When the OCP has converged on a steady state during discharge, its value may provide an estimate of the mole fraction of NiCl 2 at the interface of the triclinic (Ni,Fe)Cl 2 film that resulted from metal oxidation. Detailed analyses of the experiment require modeling of the galvanic conversion rates, which depend on both charge-transfer and mass-transfer phenomena.
A model has been developed to investigate the reaction mechanism in a mixed-metal chloride (MCl 2... more A model has been developed to investigate the reaction mechanism in a mixed-metal chloride (MCl 2 , M=Ni & Fe) electrode; chemically similar to those found in sodium-metal chloride cells; during constant-current oxidation and reduction at 300° C. The proposed model is also used to predict open-circuit-voltage (OCV) relaxation data obtained at different states of oxidation and reduction during galvanostatic interrupt titration. The OCV relaxation data exhibit large transitions between Fe ++ /Fe and Ni ++ /Ni Nernst potentials, following interrupted reduction at Fe ++ reduction potentials. These transitions are simulated by assuming spontaneous redox between NiCl 2 and iron, confirming that residual NiCl 2 is present during FeCl 2 reduction.
Abstract: To understand the dynamics of electrochemical cycling, a high-temperature sodium | ferr... more Abstract: To understand the dynamics of electrochemical cycling, a high-temperature sodium | ferrous chloride storage cell was modeled in two dimensions. The positive electrode, micronized iron, ferrous chloride, and sodium chloride, impregnated with a molten-salt electrolyte, is represented as a continuum, using porous electrode theory. The cell can thusly be described using transport phenomena and heterogeneous reaction kinetics. The timedependent solution shows that a reaction front, starting at the interface with the negative electrode, moves deeper into the positive electrode with increasing depth of discharge. Cell potential falls continuously as the discharge front moves deeper; Ohmic resistance in the porous electrode limits cell performance.
Biofouling, 2003
Model silicone foul-release coatings with controlled molecular architecture were evaluated to det... more Model silicone foul-release coatings with controlled molecular architecture were evaluated to determine the effect of compositional variables such as filler loading and crosslink density on pseudobarnacle attachment strength. Pseudobarnacle adhesion values correlated with ...
Uploads
Papers by Michael Vallance