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Institution

University of Saskatchewan

EducationSaskatoon, Saskatchewan, Canada
About: University of Saskatchewan is a education organization based out in Saskatoon, Saskatchewan, Canada. It is known for research contribution in the topics: Population & Health care. The organization has 25021 authors who have published 52579 publications receiving 1483049 citations. The organization is also known as: USask.


Papers
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Journal Article
TL;DR: An evolving e-learning system which can adapt itself both to the learners and to the open Web, and it is argued that a hybrid collaborative filtering technique is more efficient to make "just-in-time" recommendations.
Abstract: In this article, we proposed an evolving e-learning system which can adapt itself both to the learners and to the open Web, and we pointed out the differences of making recommendations in e-learning and other domains. We propose two pedagogy features in recommendation: learner interest and background knowledge. A description of a paper's value, similarity, and ordering are presented using formal definitions. We also study two pedagogy-oriented recommendation techniques: content-based and hybrid recommendations. We argue that while it is feasible to apply both of these techniques in our domain, a hybrid collaborative filtering technique is more efficient to make \"just-in-time\" recommendations. In order to assess and compare these two techniques, we carried out an experiment using artificial learners. Experiment results are encouraging, showing that hybrid collaborative filtering, which can lower the computational costs, will not compromise the overall performance of the recommendation system. In addition, as more and more learners participate in the learning process, both learner and paper models can better be enhanced and updated, which is especially desirable for webbased learning systems. We have tested the recommendation mechanisms with real learners, and the results are very encouraging.

276 citations

01 Jan 2015
TL;DR: In this article, a vacuum-assisted liquid-vapor "flow-through" method was used to exchange Na-MFI disks with Ga 3+,Z n 2+, and Pt 2+ ions in the temperature range of 23-70 C and exchange times of 5-24 h.
Abstract: Ion exchange of nanoporous (e.g., zeolite) membranes is of increasing importance in their applications as separation devices and catalytic reactors. Ion exchange processes in zeolite membranes are significantly limited by slow hydrated-ion transport rates and the low liquid-solid interfacial area available in com- parison to ion exchange of zeolites in powdered form, thereby leading to long membrane processing and regeneration times. Here, we consider ion exchange processes in zeolite membranes in more detail, and show the much higher efficacy of a vacuum-assisted liquid-vapor 'flow-through' method in compar- ison to both the conventional 'immersion/counter-diffusion' method as well as a liquid-liquid flow- through method. Na-MFI zeolite disk membranes, made by both in situ and seeded growth, were ion- exchanged with Ga 3+ ,Z n 2+ , and Pt 2+ ions in the temperature range of 23-70 C and exchange times of 5-24 h. The penetration of these ions into the zeolite membranes was investigated in detail by energy- dispersive X-ray (EDX) spectroscopy. Surprisingly, the quantity of exchanged ions in the membranes via the vacuum-assisted 'flow-through' technique is found to exceed that achieved by the other two methods by up to a factor of ten, with the liquid-liquid technique being the least efficient. Higher tem- peratures and longer ion exchange times increased the ion exchange efficiency in the vacuum-assisted method. Chemical analysis of the condensed permeate solution by inductively-coupled plasma (ICP) mass spectrometry revealed that both the original Na

276 citations

Journal ArticleDOI
TL;DR: It is confirmed that neither vision nor vestibular deprivation correlated with sway, which confirms the place of these senses as secondary in the maintenance of posture.
Abstract: Sway has been measured by Wright's Ataxiameter in 151 frail elderly and five young subjects, and compared with various sensory modalities. There is a close relationship between increased sway and impaired vibration sense in the legs. No correlations emerged with proprioception but this may reflect the imprecision of the test. That neither vision nor vestibular deprivation correlated with sway confirms the place of these senses as secondary in the maintenance of posture. Vestibular impairment was found in only 6% of the elderly subjects, by tilt test--and these were the very old. There was a limited relationship between falls in the past year and both sway and proprioception. Language: en

275 citations

Journal ArticleDOI
TL;DR: In this paper, a new cognitive explanation for how pupils cope with disparate worldviews mediated by transcending cultural borders between their everyday culture and the culture of science is proposed, where teachers assume a role of culture broker in the classroom to achieve culturally sensitive curriculum and assessment.
Abstract: The current development towards ‘science for all’ in all parts of the globe necessitates that consideration be given to how pupils move between their everyday life‐world and the world of school science, how pupils deal with cognitive conflicts between those two worlds, and what this means for effective teaching of science. This paper reviews a new cognitive explanation‐‐collateral learning theory‐‐for how pupils cope with disparate worldviews mediated by transcending cultural borders between their everyday culture and the culture of science. The assistance that most pupils receive when they attempt to negotiate these cultural borders will influence their success at science. A new pedagogy is proposed in which teachers assume a role of culture broker in the classroom to achieve culturally sensitive curriculum and assessment.

275 citations

Journal ArticleDOI
TL;DR: In this paper, a series of process-based algorithms have been developed to describe the accumulation, unloading and sublimation of intercepted snow in forest canopies in a southern boreal forest jack pine stand during late winter.
Abstract: A series of process-based algorithms has been developed to describe the accumulation, unloading and sublimation of intercepted snow in forest canopies. These algorithms are unique in that they scale up the physics of interception and sublimation from small scales, where they are well understood, to forest stand-scale calculations of intercepted snow sublimation. Evaluation of results from the set of algorithms against measured interception and sublimation, in a southern boreal forest jack pine stand during late winter, found that the coupled model provides reasonable approximations of both interception and sublimation losses on half-hourly, daily and event bases. Cumulative errors in the estimate of intercepted snow load over 23 days of test were 0.06 mm SWE, with a standard deviation of 0.46 mm SWE. Sublimation losses during the evaluation were high, approximately two-thirds of snowfall within this period. Seasonal intercepted snow sublimation as a portion of annual snowfall at the model test site was lower than sublimation during the tests, ranging from 13% for a mixed spruce-aspen, 31% for the mature pine and 40% for a mature spruce stand. The results indicate that sublimation can be a significant abstraction of water from mature evergreen stands in northern forests and that the losses can be calculated by application of process-based algorithms.

275 citations


Authors

Showing all 25277 results

NameH-indexPapersCitations
Tomas Hökfelt158103395979
Frederick Wolfe119417101272
Christopher G. Goetz11665159510
John P. Giesy114116262790
Helmut Kettenmann10438040211
Paul M. O'Byrne10460556520
Susan S. Taylor10451842108
Keith A. Hobson10365341300
Mark S. Tremblay10054143843
James F. Fries10036983589
Gordon McKay9766161390
Jonathan D. Adachi9658931641
Wenjun Zhang9697638530
William C. Dement9634043014
Chris Ryan9597134388
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
2023173
2022350
20213,129
20202,913
20192,665
20182,479