10 research outputs found
Extreme Ultra-Violet Spectroscopy of the Lower Solar Atmosphere During Solar Flares
The extreme ultraviolet portion of the solar spectrum contains a wealth of
diagnostic tools for probing the lower solar atmosphere in response to an
injection of energy, particularly during the impulsive phase of solar flares.
These include temperature and density sensitive line ratios, Doppler shifted
emission lines and nonthermal broadening, abundance measurements, differential
emission measure profiles, and continuum temperatures and energetics, among
others. In this paper I shall review some of the advances made in recent years
using these techniques, focusing primarily on studies that have utilized data
from Hinode/EIS and SDO/EVE, while also providing some historical background
and a summary of future spectroscopic instrumentation.Comment: 34 pages, 8 figures. Submitted to Solar Physics as part of the
Topical Issue on Solar and Stellar Flare
First observation of the decay and a measurement of the ratio of branching fractions
The first observation of the decay using
data collected by the LHCb detector at a centre-of-mass energy of 7 TeV,
corresponding to an integrated luminosity of 36 pb, is reported. A
signal of events is obtained and the absence of signal is
rejected with a statistical significance of more than nine standard deviations.
The branching fraction is measured relative to
that of : , where the first uncertainty is statistical, the second systematic and
the third is due to the uncertainty on the ratio of the and
hadronisation fractions.Comment: 10 pages, 3 figures, submitted to Phys. Lett. B; ISSN 0370-269
Prediction for Separation Flows Around a 6:1 Prolate Spheroid Using Hybrid RANS/LES Methods
Structural analysis on a hemisphere-cylinder at moderate Reynolds number and high angle of attack
Sediment suspension dynamics and a new criterion for the maintenance of turbulent suspensions
Wandschubspannungsmessungen an einem nichtangestellten Rotationsellipsoid im Deutsch-Niederlaendischen Windkanal (DNW)
Copy held by FIZ Karlsruhe; available from UB/TIB Hannover / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman
Observation of J/Ï-pair production in pp collisions at âs=7 TeV
The production of J/Ï pairs in protonâproton collisions at a centre-of-mass energy of 7 TeV has been observed using an integrated luminosity of 37.5 pbâ1 collected with the LHCb detector. The production cross-section for pairs with both J/Ï in the rapidity range 2 < yJ/Ï < 4.5 and transverse momentum pJ/Ï T <10 GeV/c is ÏJ/ÏJ/Ï =5.1±1.0±1.1 nb, where the ïŹrst uncertainty is statistical and the second systematic
Measurement of the inclusive Ï cross-section in pp collisions at âs=7 TeV
The cross-section for inclusive Ï meson production in pp collisions at a centre-of-mass energy of âs = 7 TeV has been measured with the LHCb detector at the Large Hadron Collider. The differential cross-section is measured as a function of the Ï transverse momentum pT and rapidity y in the region 0.6< pT <5.0 GeV/c and 2.44< y <4.06. The cross-section for inclusive Ï production in this kinematic range is Ï(ppâÏX)=1758±19(stat) +43â14(syst)±182(scale) ÎŒb, where the ïŹrst systematic uncertainty depends on the pT and y region and the second is related to the overall scale. Predictions based on the Pythia 6.4 generator underestimate the cross-section