401 research outputs found
Application of a Skill Taxonomy in Aviation
The objective of this project was to develop a preliminary taxonomy for defining the construct âskill,â drawing from the various definitions described in the extant literature. Three separate cognitive task analyses (CTA) were conducted utilizing interviews and observations with subject matter experts within the context of (1) a virtual reality part task trainer for airborne refueling, (2) skills required by pilots in commercial aviation, and (3) aviation maintenance skills for unmanned aircraft systems. The findings from the CTAs were applied to refine the preliminary taxonomy
Isolamento do vĂrus rĂĄbico de morcego insetĂvoro Myotis nigricans
The following is a case study of the natural infection by the rabies virus of an insectiverous bat belonging to the species Myotis nigricans in the municipality of RibeirĂŁo Pires, Greater S. Paulo. Diagnosis was made by means of immunofluorescence and intracerebral innoculation of mice with nervous and intrascapular muscular tissues.Relata-se um caso de infecção natural de raiva em morcego insetĂvoro Myotis nigricans, no MunicĂpio de RibeirĂŁo Pires, Grande SĂŁo Paulo (Brasil). O diagnĂłstico realizou-se atravĂ©s das tĂ©cnicas de imunofluorescĂȘncia e inoculação intracerebral em camundongos, do tecido nervoso e da musculatura da regiĂŁo interescapular do morcego
Impact of lifting of two types of barrels on postural control, trunk muscle recruitment, and kinematic measures in manual workers
The aim of this study was to evaluate the impact of 2 types of beer barrels on postural control, trunk activation, and kinematic measures in adult workers. Twelve (12) males randomly performed 4 tasks on a force platform for 20 s: (1) hold an empty recyclable barrel, (2) hold a full recyclable barrel (30 L), (3) hold an empty steel barrel, and (4) hold a full steel barrel (30 L). Trunk muscular activation, force platform and kinematic measures at the trunk, hip, and knee joints were computed. The full steel barrel produced greater postural oscillation than other conditions. Higher trunk activity was also reported during the full steel barrel task. Significant kinematic changes only in the trunk were observed between the empty steel barrel and the full recyclable barrel tasks. In conclusion, the full steel barrel produced a negative impact on postural control, increasing trunk activity and changing trunk flexion angle in adult workers
Anatomical aspects of the embryo and initial development of Oenocarpus minor Mart: a palm tree from the Amazon
The anatomy of the embryo and the initial germination phase of O. minor seeds are examined here. Ripe fruits were collected from five individuals, the pulp removed, and the seeds sown in beds with sandy substrate in a greenhouse with 50% shade. Germination follow-up was made by collecting different stages of development. The anatomical study done according to usual techniques of light microscopy. The embryo is capitate and occupies a central position in the basal region of the seed. The embryogenic axis is located in the proximal region in a position that is oblique to the cotyledon axis. The cotyledon is formed by parenchymatous, procambial and protodermic tissue. The vascular bundles lie along the peripheral zone of the distal region to the embryogenicaxis. After 14 days, the primary rootemerges; after 21 days, the first cotyledon sheath and after 35 days, the second cotyledon sheath, and the seedling emerges above the substrate. Germination is of the ligule adjacent type.Neste trabalho foi feita a anatomia do embriĂŁo e a fase inicial da germinação da semente de O. minor. Frutos maduros de cinco indivĂduos foram despolpados e as sementes obtidas foram semeadas em canteiros contendo substrato areia em casa de vegetação com sombreamento a 50%. O acompanhamento da germinação foi feito atravĂ©s de coletas das diferentes fases do desenvolvimento. O estudo anatĂŽmico foi realizado conforme tĂ©cnicas usuais de microscopia de luz. O embriĂŁo Ă© capitado. O eixo embrionĂĄrio localiza-se na regiĂŁo proximal em posição oblĂqua ao eixo cotiledonar. O cotilĂ©done Ă© formado por tecido parenquimĂĄtico, procambial e protodĂ©rmico. Os feixes vasculares ocorrem ao longo da zona perifĂ©rica da regiĂŁo distal atĂ© ao eixo embrionĂĄrio. Aos 14 dias Ă© emitida a raiz primĂĄria. Aos 21 dias forma-se a primeira bainha cotiledonar e aos 35 dias a segunda bainha cotiledonar ocorrendo Ă emergĂȘncia da plĂąntula acima do substrato. A germinação Ă© do tipo adjacente ligular
Measurements of long-range near-side angular correlations in TeV proton-lead collisions in the forward region
Two-particle angular correlations are studied in proton-lead collisions at a
nucleon-nucleon centre-of-mass energy of TeV, collected
with the LHCb detector at the LHC. The analysis is based on data recorded in
two beam configurations, in which either the direction of the proton or that of
the lead ion is analysed. The correlations are measured in the laboratory
system as a function of relative pseudorapidity, , and relative
azimuthal angle, , for events in different classes of event
activity and for different bins of particle transverse momentum. In
high-activity events a long-range correlation on the near side, , is observed in the pseudorapidity range . This
measurement of long-range correlations on the near side in proton-lead
collisions extends previous observations into the forward region up to
. The correlation increases with growing event activity and is found
to be more pronounced in the direction of the lead beam. However, the
correlation in the direction of the lead and proton beams are found to be
compatible when comparing events with similar absolute activity in the
direction analysed.Comment: All figures and tables, along with any supplementary material and
additional information, are available at
https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2015-040.htm
Evidence for the strangeness-changing weak decay
Using a collision data sample corresponding to an integrated luminosity
of 3.0~fb, collected by the LHCb detector, we present the first search
for the strangeness-changing weak decay . No
hadron decay of this type has been seen before. A signal for this decay,
corresponding to a significance of 3.2 standard deviations, is reported. The
relative rate is measured to be
, where and
are the and fragmentation
fractions, and is the branching
fraction. Assuming is bounded between 0.1 and
0.3, the branching fraction would lie
in the range from to .Comment: 7 pages, 2 figures, All figures and tables, along with any
supplementary material and additional information, are available at
https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2015-047.htm
flavour tagging using charm decays at the LHCb experiment
An algorithm is described for tagging the flavour content at production of
neutral mesons in the LHCb experiment. The algorithm exploits the
correlation of the flavour of a meson with the charge of a reconstructed
secondary charm hadron from the decay of the other hadron produced in the
proton-proton collision. Charm hadron candidates are identified in a number of
fully or partially reconstructed Cabibbo-favoured decay modes. The algorithm is
calibrated on the self-tagged decay modes and using of data collected by the LHCb
experiment at centre-of-mass energies of and
. Its tagging power on these samples of
decays is .Comment: All figures and tables, along with any supplementary material and
additional information, are available at
http://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2015-027.htm
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