4,097 research outputs found
In Search of the Fishermanâs Path: Rethinking the American Assault on Queenston Heights
Canadian historians of the War of 1812 tend to associate a fishermanâs path with the initial success achieved by the Americans at the Battle of Queenston Heights. Unobserved, they made their way to the top of the escarpment and forced Brock to evacuate the redan battery located just below the brow of the heights. Desperate to retake this commanding position, Brock launched the ill-fated charge which resulted in his untimely death. It is a standard interpretation. But as this study reveals, the Americans had no particular need of a fishermanâs path
On Nonlocal Energy Transfer via Zonal Flow in the Dimits Shift
The two-dimensional Terry-Horton equation is shown to exhibit the Dimits
shift when suitably modified to capture both the nonlinear enhancement of
zonal/drift-wave interactions and the existence of residual Rosenbluth-Hinton
states. This phenomenon persists through numerous simplifications of the
equation, including a quasilinear approximation as well as a four-mode
truncation. It is shown that the use of an appropriate adiabatic electron
response, for which the electrons are not affected by the flux-averaged
potential, results in an
nonlinearity that can efficiently transfer energy nonlocally to length scales
on the order of the sound radius. The size of the shift for the nonlinear
system is heuristically calculated and found to be in excellent agreement with
numerical solutions. The existence of the Dimits shift for this system is then
understood as an ability of the unstable primary modes to efficiently couple to
stable modes at smaller scales, and the shift ends when these stable modes
eventually destabilize as the density gradient is increased. This nonlocal
mechanism of energy transfer is argued to be generically important even for
more physically complete systems.Comment: 28 pages, 7 figures, 4 movie
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Long-term cultures of murine fetal liver retain very early B lymphoid phenotype.
Long-term cultures of murine fetal liver have been successfully established using a modification of our in vitro bone marrow culture system (14, 15). Fetal liver cells from midgestation BALB/c embryos were plated onto BAB-14 bone marrow stromal cell-adherent layers. After a 3-5 wk period, cell growth began to increase and these cells were expanded in number on fresh feeder layers. The cultured fetal liver cells were lymphoid in morphology, 5-20% cytoplasmic Ig-positive, but less than 1% surface Ig-positive. Southern blot analysis of the cultured fetal liver cells, as well as cultured bone marrow-derived B cells, demonstrated a population with germline Ig heavy chain loci, possibly representing very early B cell precursors. Abelson murine leukemia virus (A-MuLV) clonal transformants of such cultured fetal liver cells had a phenotypic distribution similar to that seen with fresh fetal liver transformants but distinct from those obtained with the transformation of either cultured or fresh bone marrow. All A-MuLV transformants isolated had rearrangements at the mu heavy chain locus of both chromosomes, irrespective of Ig production. In addition, most mu heavy chain producers had at least one rearranged kappa gene locus. These long-term fetal liver cultures provide large numbers of cells for studying events early in the B lymphocyte lineage. The cultured fetal liver cells retained phenotypic traits similar to fresh fetal liver B cells and distinctive from bone marrow cells cultured under similar conditions
La prise de deÌcision dâurgence chez les pompiers premiers reÌpondants : Une illustration de la pertinence dâune approche empirique en eÌthique professionnelle
ArticleLors dâune urgence meÌdicale, lâintervention se doit dâeÌtre immeÌdiate. Le temps de deÌlibeÌration est court, voire inexistant. Pourtant, lâintervenant portera la responsabiliteÌ de ses deÌcisions et de ses actions. Cette complexiteÌ de la deÌcision dâurgence demeure peu eÌtudieÌe en eÌthique. Pour contribuer aÌ combler cette lacune, cet article portera sur la prise de deÌcision chez les pompiers premiers reÌpondants. Il preÌsente les donneÌes issues de focus groups reÌaliseÌs aupreÌs de pompiers du Service de SeÌcuriteÌ Incendie de la Ville de MontreÌal. Dans un premier temps, cet article illustrera la compreÌhension de la prise de deÌcision dâurgence de ces pompiers premiers reÌpondants. Dans un deuxieÌme temps, il montrera quâune approche empirique est indispensable aÌ lâeÌthicien qui sâaventure en caserne : cette approche empirique est reÌveÌlatrice des confrontations eÌthiques des pompiers et des moyens mis en place pour neutraliser ces confrontations.During an emergency, response has to be immediate. Deliberation time is limited, even nonexistent. But professionals are responsible for their decisions and their actions. The complexity of decision-making during an emergency is an under-researched topic in bioethics. To contribute to this topic, this article focuses on decision- making by firefighter first responders. It presents empirical data from focus groups with firefighters who are first responders for the Service de SeÌcuriteÌ Incendie de la Ville de MontreÌal. First, this article describes the way that firefighters understand decision-making during an emergency. Second, an empirical approach is shown to be necessary for bioethics researchers who venture to do research in fire departments: this empirical approach reveals firefighterâs ethical challenges and how they can be neutralised
In Search of the Fishermanâs Path: Rethinking the American Assault on Queenston Heights
Canadian historians of the War of 1812 tend to associate a fishermanâs path with the initial success achieved by the Americans at the Battle of Queenston Heights. Unobserved, they made their way to the top of the escarpment and forced Brock to evacuate the redan battery located just below the brow of the heights. Desperate to retake this commanding position, Brock launched the ill-fated charge which resulted in his untimely death. It is a standard interpretation. But as this study reveals, the Americans had no particular need of a fishermanâs path
Tevatron results on the Standard Model Higgs search in the high-mass region
Results for the Tevatron search for the Higgs boson decaying to W boson pairs in proton antiproton collisions at
âs = 1960 GeV/c2 are presented. The CDF results are based on the entire Tevatron Run II dataset having an integrated
luminosity of 9.7 fbâ1. The CDF results exclude a Standard Model Higgs at 95% confidence level for a Higgs mass MH in the range 148 †MH †173GeV/c2 with an expected sensitivity of 153 †MH †177GeV/c2, comparable to the previous Tevatron combined sample from July 2011
Saint-Jean-sur-Richelieu: RĂ©apprendre Ă vivre la ville
Affiche de projet terminal, baccalauréat en Urbanisme. Institut d'urbanisme, Université de Montréal
How Could Emergency Modify our Normal Ethics Standards? A Brief Review of Selected Chapters in Emergency Ethics
Compte-rendu / ReviewCe compte-rendu porte sur Emergency Ethics, le premier livre dâune sĂ©rie de quatre volumes intitulĂ©e Emergency Ethics, Law and Policy. Il analyse les chapitres qui abordent la question Ă savoir comment lâurgence pourrait modifier nos standards Ă©thiques normaux. Les chapitres prennent la question sous trois angles : analyse conceptuelle, analyse empirique et Ă©tude de cas.This review is about Emergency Ethics, the first in the four-volume series Emergency Ethics, Law and Policy. It analyses chapters addressing the question: How could emergency modify our normal ethics standards? The chapters offer three angles on the question: conceptual analysis, empirical analysis and case study
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