771 research outputs found
Experiences with OpenMP in tmLQCD
An overview is given of the lessons learned from the introduction of
multi-threading using OpenMP in tmLQCD. In particular, programming style,
performance measurements, cache misses, scaling, thread distribution for hybrid
codes, race conditions, the overlapping of communication and computation and
the measurement and reduction of certain overheads are discussed. Performance
measurements and sampling profiles are given for different implementations of
the hopping matrix computational kernel.Comment: presented at the 31st International Symposium on Lattice Field Theory
(Lattice 2013), 29 July - 3 August 2013, Mainz, German
Detection of colistin resistance in Salmonella enterica using MALDIxin test on the routine MALDI Biotyper Sirius mass spectrometer
Resistance to polymyxins in most Gram-negative bacteria arises from chemical modifications to the lipid A portion of their lipopolysaccharide (LPS) mediated by chromosomally-encoded mutations or the recently discovered plasmid-encoded mcr genes that have further complicated the landscape of colistin resistance. Currently, minimal inhibitory concentration (MIC) determination by broth microdilution, the gold standard for the detection of polymyxin resistance, is time consuming (24 hours) and challenging to perform in clinical and veterinatryveterinary laboratories. Here we present the use of the MALDIxin to detect colistin resistant Salmonella enterica using the MALDxin test on the routine matrix-assisted laser desorption ionization (MALDI) Biotyper Sirius system
Nucleon scalar and tensor charges using lattice QCD simulations at the physical value of the pion mass
We present results on the light, strange and charm nucleon scalar and tensor
charges from lattice QCD, using simulations with flavors of twisted
mass Clover-improved fermions with a physical value of the pion mass. Both
connected and disconnected contributions are included, enabling us to extract
the isoscalar, strange and charm charges for the first time directly at the
physical point. Furthermore, the renormalization is computed non-perturbatively
for both isovector and isoscalar quantities. We investigate excited state
effects by analyzing several sink-source time separations and by employing a
set of methods to probe ground state dominance. Our final results for the
scalar charges are , ,
, and for the tensor charges
, ,
, in the scheme at 2~GeV. The first error is statistical, the second is the
systematic error due to the renormalization and the third the systematic
arising from possible contamination due to the excited states.Comment: 20 pages and 13 figure
Дифференциально−диагностические нейрофизиологические корреляты эмоционально−личностных и поведенческих расстройств у подростков с мозговой дисфункцией
Представлены результаты исследования функциональной активности головного мозга у подростков с мозговой дисфункцией и эмоциональными, личностными, поведенческими расстройствами. Выявлены нейрофизиологические корреляты изменений характера и поведения больных подростков.The findings of brain functional activity investigation in teenagers with cerebral dysfunction as well as emotional, personality, behavioral disorders are reported. Neurophysiological correlates of the character and behavior changes in teen−agers were revealed
A first look at maximally twisted mass lattice QCD calculations at the physical point
In this contribution, a first look at simulations using maximally twisted
mass Wilson fermions at the physical point is presented. A lattice action
including clover and twisted mass terms is presented and the Monte Carlo
histories of one run with two mass-degenerate flavours at a single lattice
spacing are shown. Measurements from the light and heavy-light pseudoscalar
sectors are compared to previous results and their phenomenological
values. Finally, the strategy for extending simulations to is
outlined.Comment: presented at the 31st International Symposium on Lattice Field Theory
(Lattice 2013), 29 July - 3 August 2013, Mainz, German
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