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Search Results: 1 - 10 of 10915 matches for " Pierre Lamothe "
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Mapping caribou habitat north of the 51st parallel in Québec using Landsat imagery
Stéphanie Chalifoux,Isabelle Saucier,G. Jean Doucet,Pierre Lamothe
Rangifer , 2003,
Abstract: A methodology using Landsat Thematic Mapper (TM) images and vegetation typology, based on lichens as the principal component of caribou winter diet, was developed to map caribou habitat over a large and diversified area of Northern Québec. This approach includes field validation by aerial surveys (helicopter), classification of vegetation types, image enhancement, visual interpretation and computer assisted mapping. Measurements from more than 1500 field sites collected over six field campaigns from 1989 to 1996 represented the data analysed in this study. As the study progressed, 14 vegetation classes were defined and retained for analyses. Vegetation classes denoting important caribou habitat included six classes of upland lichen communities (Lichen, Lichen-Shrub, Shrub-Lichen, Lichen-Graminoid-Shrub, Lichen-Woodland, Lichen-Shrub-Woodland). Two classes (Burnt-over area, Regenerating burnt-over area) are related to forest fire, and as they develop towards lichen communities, will become important for caribou. The last six classes are retained to depict remaining vegetation cover types. A total of 37 Landsat TM scenes were geocoded and enhanced using two methods: the Taylor method and the false colour composite method (bands combination and stretching). Visual inter pretation was chosen as the most efficient and reliable method to map vegetation types related to caribou habitat. The 43 maps produced at the scale of 1:250 000 and the synthesis map (1:2 000 000) provide a regional perspective of caribou habitat over 1200 000 km2 covering the entire range of the George river herd. The numerical nature of the data allows rapid spatial analysis and map updating.
Breeding Status and Population Trends of Golden Eagles in Northeastern Québec, Canada
Fran?ois Morneau,Benoit Gagnon,Sandie Poliquin,Pierre Lamothe
Avian Conservation and Ecology , 2012, DOI: 10.5751/ace-00547-070204
Abstract: In North America, it is hypothesized that the Golden Eagle's (Aquila chrysaetos) eastern population declined during the period 1946-1973 because of organochlorine pesticides and other anthropogenic causes of mortality. Since 1970, upward trends for the species have been observed at most eastern hawkwatches. To determine whether such positive trends can be observed on breeding grounds, Golden Eagle counts were performed to monitor nesting territory occupancy between 1994 and 2007 in the Moisie and Sainte-Marguerite River valleys, northeastern Québec. Aerial surveys were conducted during seven of the 14 years. During this period, the number of known nesting territories in the study area increased from 10 to 20, while the number of pairs rose from six to 14. The increase is attributed mostly to investigators' improved experience in finding nests and to their greater familiarity with the study area, and possibly to the growth of the regional population. Occupancy of nesting territories by pairs was very stable over the years. Annual mean % of laying pairs (or laying rate) was 48.0 (SD = 19.9), and productivity (mean number of fledglings per pair) was 0.49 (SD = 0.35).
Driving Difficulties and Adaptive Strategies: The Perception of Individuals Having Sustained a Mild Traumatic Brain Injury
Carolina Bottari,Marie-Pierre Lamothe,Nadia Gosselin,Isabelle Gélinas,Alain Ptito
Rehabilitation Research and Practice , 2012, DOI: 10.1155/2012/837301
Abstract: Introduction. After a mild traumatic brain injury (mTBI), individuals quickly resume driving. However, relatively little is known about the impact of mTBI on driving ability and, notably, on the perceived influence of postconcussive symptoms on driving. Hence, the objective of this study was to document the perception of driving abilities in individuals with mTBI. Method. Twenty-seven drivers with mTBI were interviewed to document their perception regarding their driving abilities. Both driving-related difficulties and compensatory strategies used to increase driving safety were documented. A mixed quantitative and qualitative analysis of the data was completed. Results. 93% of participants reported at least one difficulty perceived as having an impact on everyday activities. Most frequently named problems affecting driving were fatigue and reduced concentration. In addition, 74% of participants had adapted their driving or developed strategies to compensate for driving difficulties. Discussion/Conclusion. Postconcussive symptoms have repercussions on driving ability. However, people with mTBI tend to be aware of their difficulties and develop, over time, adaptive strategies. Preventive measures are thus warranted to increase health care professionals' awareness of the potential consequences of mTBI on driving ability and to promote guidelines for the safe resumption of driving after injury. 1. Introduction Mild traumatic brain injury (mTBI) is a major public health problem disproportionately affecting young adults [1]. Incidence in the United States is about 600 per 100,000 population, though many do not seek medical care, and only 25% are admitted to hospital [1]. It is estimated that up to 25% of individuals presenting to the emergency department with mTBI have persisting postconcussive symptoms at 6 months following injury [2], such as headaches, fatigue, concentration deficits, delayed information processing, and vision and memory problems. Despite these problems, individuals generally resume driving shortly after their mTBI. However, very few studies have examined the potential consequences of mTBI on driving ability to promote positive strategies and guidelines for the safe resumption of driving after injury. In the present study, this issue will be investigated by obtaining the perspective of individuals who have sustained a mTBI in order to explore and describe the problems they experience in relation to driving, and the strategies they utilize to ensure safety when driving. Driving is a complex, cognitively demanding activity [3]. It requires
Evidence for cognitive vestibular integration impairment in idiopathic scoliosis patients
Martin Simoneau, Vincent Lamothe, émilie Hutin, Pierre Mercier, Normand Teasdale, Jean Blouin
BMC Neuroscience , 2009, DOI: 10.1186/1471-2202-10-102
Abstract: Compared to healthy controls, the idiopathic scoliosis patients underestimated the amplitude of their rotations. Moreover, the results revealed that idiopathic scoliosis patients produced accurate saccades to memorized peripheral targets in absence of body rotation and that their vestibulo-ocular reflex gain did not differ from that of control participants.Overall, results of the present study demonstrate that idiopathic scoliosis patients have an alteration in cognitive integration of vestibular signals. It is possible that severe spine deformity developed partly due to impaired vestibular information travelling from the cerebellum to the vestibular cortical network or alteration in the cortical mechanisms processing the vestibular signals.Idiopathic scoliosis is a complex deformation of the spine and it is the most common type of spine deformity. Its prevalence is about 2% to 3% in children aged between 10 to 16 years old and girls are at a higher risk than boys for severe progression. Although the etiopathogenesis of scoliosis is unknown, various factors have been identified that could be related to the etiology of scoliosis. Among these factors, it has been proposed that neurological mechanisms could be related to scoliosis [1]. Nonetheless, no clear-cut neurological tests either for diagnosing idiopathic scoliosis or for predicting its progression have so far been established.Neurological deficits in idiopathic scoliosis have mostly been evidenced by studies examining the patient's motor behavior. For instance, several studies have demonstrated that compared to age-matched individuals, idiopathic scoliosis patients (ISP) show deficits in controlling their postural sway [e.g., [2]]. Because many idiopathic scoliosis patients show longer somatosensory cortical potentials (parietal N37) compared to healthy individuals, their balance instabilities could be associated with alteration in sensory signal processing [3-5]. Consistent with this hypothesis, impairment in
Electronic Serials Usage Patterns as Observed at a Medium-Size University: Searches and Full-Text Downloads
Alain Lamothe
Partnership : the Canadian Journal of Library and Information Practice and Research , 2008,
Abstract: while library budgets remain either stagnant or on the decrease, it becomesnecessary to evaluate the use of a library's electronic collection. In 2006, usagestatistics were evaluated at Laurentian University, Canada, to provide direction tocollection development and identify high-cost low-use electronic serials.Searches and full-text downloads were studied. A sharp increase in use wasobserved in and around 2004 which can be explained by the introduction, inOntario, of the 'double cohort', by the rapid increase in the number of electronicresources subscribed to at Laurentian, and by the adoption of OpenURLtechnology. Heavily used electronic serials are identified. Turnaways,connections by IP address and Bradford's 20:80 rule are also examined. Theapplication of a cost-per-download ratio provided a practical method foridentifying underused products.
Symmetry group analysis of an ideal plastic flow
Vincent Lamothe
Physics , 2011, DOI: 10.1063/1.3690048
Abstract: In this paper, we study the Lie point symmetry group of a system describing an ideal plastic plane flow in two dimensions in order to find analytical solutions. The infinitesimal generators that span the Lie algebra for this system are obtained. We completely classify the subalgebras of up to codimension two in conjugacy classes under the action of the symmetry group. Based on invariant forms, we use Ansatzes to compute symmetry reductions in such a way that the obtained solutions cover simultaneously many invariant and partially invariant solutions. We calculate solutions of the algebraic, trigonometric, inverse trigonometric and elliptic type. Some solutions depending on one or two arbitrary functions of one variable have also been found. In some cases, the shape of a potentially feasible extrusion die corresponding to the solution is deduced. These tools could be used to thin, curve, undulate or shape a ring in an ideal plastic material.
Symmetry groups of non-stationary planar ideal plasticity
Vincent Lamothe
Physics , 2014, DOI: 10.1088/1751-8113/48/11/115201
Abstract: This paper is a study of the Lie groups of point symmetries admitted by a system describing a non-stationary planar flow of an ideal plastic material. For several types of forces involved in the system, the infinitesimal generators which generate the Lie algebra of symmetries have been obtained. In the case of a monogenic force, the classification of one- and two- dimensional subalgebras into conjugacy classes under the action of the group of automorphisms has been accomplished. The method of symmetry reduction is applied for certain subalgebra classes in order to obtain invariant solutions.
Group analysis of an ideal plasticity model
Vincent Lamothe
Physics , 2012, DOI: 10.1088/1751-8113/45/28/285203
Abstract: In this paper, we study the Lie point symmetry group of a system describing an ideal plastic plane flow in two dimensions in order to find analytical solutions of the system. The infinitesimal generators that span the Lie algebra for this system are obtained, six of which are original to this paper. We completely classify the subalgebras of codimension one and two into conjugacy classes under the action of the symmetry group. We apply the symmetry reduction method in order to obtain invariant and partially invariant solutions. These solutions are of algebraic, trigonometric, inverse trigonometric and elliptic type. Some solutions, depending on one or two arbitrary functions of one variable, have also been found. In some cases, the shape of a potentially feasible extrusion die corresponding to the solution is deduced. These tools could be used to curve and undulate rectangular rods or slabs, or to shape a ring in an ideal plastic material.
An integrated strategy of knowledge application for optimal e-health implementation: A multi-method study protocol
Marie-Pierre Gagnon, France Légaré, Jean-Paul Fortin, Lise Lamothe, Michel Labrecque, Julie Duplantie
BMC Medical Informatics and Decision Making , 2008, DOI: 10.1186/1472-6947-8-17
Abstract: A three-year multi-method study is being conducted in the Province of Quebec (Canada). Decision-making at each decisional level (political, organisational and clinical) are analysed based on specific approaches. At the political level, critical incidents analysis is being used. This method will identify how decisions regarding the implementation of e-health could be influenced or not by scientific knowledge. Then, interviews with key-decision-makers will look at how knowledge was actually used to support their decisions, and what factors influenced its use. At the organisational level, e-health projects are being analysed as case studies in order to explore the use of scientific knowledge to support decision-making during the implementation of the technology. Interviews with promoters, managers and clinicians will be carried out in order to identify factors influencing the production and application of scientific knowledge. At the clinical level, questionnaires are being distributed to clinicians involved in e-health projects in order to analyse factors influencing knowledge application in their decision-making. Finally, a triangulation of the results will be done using mixed methodologies to allow a transversal analysis of the results at each of the decisional levels.This study will identify factors influencing the use of scientific evidence and other types of knowledge by decision-makers involved in planning, financing, implementing and evaluating e-health projects.These results will be highly relevant to inform decision-makers who wish to optimise the implementation of e-health in the Quebec health care system. This study is extremely relevant given the context of major transformations in the health care system where e-health becomes a must.Effectiveness, efficiency and equity are the core goals of the Canadian health care system [1]. To achieve these goals, several experiments based on e-health – the application of information and communication technologies (ICT
Electronic Serials Usage Patterns as Observed at a Medium-Size University: Searches and Full-Text Downloads.
Alain Raymond Lamothe
Partnership : the Canadian Journal of Library and Information Practice and Research , 2008,
Abstract: As the number of electronic serials available to libraries continues to increase while library budgets remain either stagnant or on the decrease, it becomes necessary to evaluate the use of a library’s electronic collection. In 2006, usage statistics were evaluated at Laurentian University, Canada, to provide direction to collection development and identify high-cost low-use electronic serials. Searches and full-text downloads were studied. A sharp increase in use was observed in and around 2004 which can be explained by the introduction, in Ontario, of the ‘double cohort’, by the rapid increase in the number of electronic resources subscribed to at Laurentian, and by the adoption of OpenURL technology. Heavily used electronic serials are identified. Turnaways, connections by IP address and Bradford’s 20:80 rule are also examined. The application of a cost-per-download ratio provided a practical method for identifying underused products.
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