A multiscale accuracy assessment of moisture content predictions using time-lapse electrical resistivity tomography in mine tailings

Accurate and large-scale assessment of volumetric water content (VWC) plays a critical role in mining waste monitoring to mitigate potential geotechnical and environmental risks. In recent years, time-lapse electrical resistivity tomography (TL-ERT) has emerged as a promising monitoring approach that can be used in combination with traditional invasive and point-measurements techniques to estimate VWC in mine tailings. Moreover, the bulk electrical conductivity (EC) imaged using TL-ERT can be converted into VWC in the field using petrophysical relationships calibrated in the laboratory. This study is the first to assess the scale effect on the accuracy of ERT-predicted VWC in tailings. Simultaneous and co-located monitoring of bulk EC and VWC are carried out in tailings at five different scales, in the laboratory and in the field. The hydrogeophysical datasets are used to calibrate a petrophysical model used to predict VWC from TL-ERT data. Overall, the accuracy of ERT-predicted VWC is , and the petrophysical models determined at sample-scale in the laboratory remain valid at larger scales. Notably, the impact of temperature and pore water EC evolution plays a major role in VWC predictions at the field scale (tenfold reduction of accuracy) and, therefore, must be properly taken into account during the TL-ERT data processing using complementary hydrogeological sensors. Based on these results, we suggest that future studies using TL-ERT to predict VWC in mine tailings could use sample-scale laboratory apparatus similar to the electrical resistivity Tempe cell presented here to calibrate petrophysical models and carefully upscale them to field applications

Non-surgical interventions for lumbar spinal stenosis leading to neurogenic claudication: a clinical practice guideline

Lumbar spinal stenosis (LSS) causing neurogenic claudication (NC) is increasingly common with an aging population and can be associated with significant symptoms and functional limitations. We developed this guideline to present the evidence and provide clinical recommendations on nonsurgical management of patients with LSS causing NC. Using the GRADE approach, a multidisciplinary guidelines panel based recommendations on evidence from a systematic review of randomized controlled trials and systematic reviews published through June 2019, or expert consensus. The literature monitored up to October 2020. Clinical outcomes evaluated included pain, disability, quality of life, and walking capacity. The target audience for this guideline includes all clinicians, and the target patient population includes adults with LSS (congenital and/or acquired, lateral recess or central canal, with or without low back pain, with or without spondylolisthesis) causing NC. The guidelines panel developed 6 recommendations based on randomized controlled trials and 5 others based on professional consensus, summarized in 3 overarching recommendations: (Grade: statements are all conditional/weak recommendations) Recommendation 1. For patients with LSS causing NC, clinicians and patients may initially select multimodal care nonpharmacological therapies with education, advice and lifestyle changes, behavioral change techniques in conjunction with home exercise, manual therapy, and/or rehabilitation (moderate-quality evidence), traditional acupuncture on a trial basis (very low-quality evidence), and postoperative rehabilitation (supervised program of exercises and/or educational materials encouraging activity) with cognitive-behavioral therapy 12 weeks postsurgery (low-quality evidence). Recommendation 2. In patients LSS causing NC, clinicians and patients may consider a trial of serotonin–norepinephrine reuptake inhibitors or tricyclic antidepressants. (very low-quality evidence). Recommendation 3. For patients LSS causing NC, we recommend against the use of the following pharmacological therapies: nonsteroidal anti-inflammatory drugs, methylcobalamin, calcitonin, paracetamol, opioids, muscle relaxants, pregabalin (consensus-based), gabapentin (very low-quality), and epidural steroidal injections (high-quality evidence). Perspective: This guideline, on the basis of a systematic review of the evidence on the nonsurgical management of lumbar spine stenosis, provides recommendations developed by a multidisciplinary expert panel. Safe and effective non-surgical management of lumbar spine stenosis should be on the basis of a plan of care tailored to the individual and the type of treatment involved, and multimodal care is recommended in most situations. © 2021 The Author

Un référentiel de compétences technopédagogiques destiné au personnel enseignant du réseau collégial

Titre de l'écran-titre (visionné le 27 sept. 2005)Également disponible en version papierBibliogr

Un référentiel de compétences technopédagogiques destiné au personnel enseignant du réseau collégial /

Également disponible en version électroniqueBibliogr.: p. 81-8

Retour d’expérience sur l’évaluation d’une formation des enseignants à la FAD dans le cadre de la crise de la COVID‑19

Face au défi du passage à l’enseignement à distance, de nombreux établissements d’enseignement supérieur ont développé des programmes de formation pour leurs enseignants. À la fin de la session d’hiver 2020, le Centre de pédagogie universitaire de l’Université de Montréal a développé un cycle comprenant une vingtaine d’activités pour concevoir et encadrer des cours à distance. Cette première itération a fait l’objet d’un processus d’évaluation systématique pour bonifier les formations futures. Cette évaluation a reposé sur la rétroaction des formateurs et des enseignants. Nous présentons ici les instruments mobilisés, relevant des approches qualitatives et quantitatives, pour sonder les enseignants.In response to the issue of the transition to distance learning, many higher education institutions developed training programs for their teachers. At the end of the 2020 winter session, the Centre de pédagogie universitaire (Université de Montréal) developed a cycle of some 20 activities to design and supervise distance courses. This first iteration was the subject of a systematic evaluation process to improve future training. This evaluation was based on trainers’ and teachers’ feedback. We present instruments used, based on qualitative and quantitative approaches, to survey teachers

Faster G0W0 implementation for more accurate photovoltaic material design

Density-functional theory (DFT) is currently the ab initio method most widely used to predict electronic energy levels of new molecules. However, approximations intrinsic to the theory limit the accuracy of calculated energy levels to about ±0.5 eV. More efficient theoretical design of molecules and polymers of interest to photovoltaic applications could be achieved if more precise ab initio methods were available. The G0W0 approach is an ab initio method that provides such an enhanced precision, with predicted energy levels precise to about ±0.05 eV. However, such calculations are currently prohibitive for systems with more than a few hundreds of electrons, thus limiting their use in the photovoltaic community. What limits calculations to this system size is the need in current implementations to invert the dielectric matrix and the need to carry out summations over conduction bands. This poster presents a strategy to avoid both of these bottlenecks. Preliminary results will be presented

Grand Prix des métiers d'art du Québec : Les Amériques

A documentation of the seventh edition of the event: with descriptions of works by 28 Quebec crafts persons from various disciplines; informations on the jury; biographical notes