Mass spectra of Ds meson from Nf = 2 twisted mass lattice QCD

2015 ◽  
Vol 30 (11) ◽  
pp. 1550060 ◽  
Author(s):  
Ning Li ◽  
Ya-Jie Wu
Keyword(s):  
Experimental Data ◽  
Lattice Qcd ◽  
Mass Spectra ◽  
Numerical Results ◽  
Mass Collaboration ◽  
Twisted Mass ◽  
Lattice Size ◽  
Ds Meson

In this paper, we study the mass spectra of Ds mesons, such as Ds, [Formula: see text] and Ds1. In the simulation, we use Nf = 2 twisted mass lattice QCD gauge configurations generated by the European Twisted Mass Collaboration (ETMC). The simulation is performed on lattices with lattice spacings a = 0.067 fm and lattice size 323×64, and a = 0.085 fm and lattice size 243×48, respectively. Our numerical results for the mass spectra of Ds mesons reached impressive agreement with the experimental data.

scholarly journals DARK MATTER SEARCH AND THE SCALAR QUARK CONTENTS OF THE NUCLEON

2011 ◽  
Vol 20 (supp01) ◽  
pp. 110-117 ◽  
Author(s):  
SIMON DINTER ◽  
VINCENT DRACH ◽  
KARL JANSEN
Keyword(s):  
Dark Matter ◽  
Lattice Qcd ◽  
Cross Section ◽  
Charm Quark ◽  
Dark Matter Search ◽  
Mass Collaboration ◽  
Twisted Mass ◽  
Scalar Quark ◽  
Simulation Results ◽  
Quark Content

We present lattice QCD simulation results from the European Twisted Mass Collaboration (ETMC) for the light, strange and charm quark contents of the nucleon. These quantities are important ingredients to estimate the cross-section for the detection of WIMPs as Dark Matter candidates. By employing a particular lattice QCD formulation, i.e. twisted mass fermions, accurate results of the light and strange scalar contents of the nucleon can be obtained. In addition, we provide a bound for the charm quark content of the nucleon.

Modelling of catalyst pellet deactivation

1985 ◽  
Vol 50 (11) ◽  
pp. 2381-2395
Author(s):  
Alena Brunovská ◽  
Ján Buriánek ◽  
Ján Ilavský ◽  
Ján Valtýni
Keyword(s):  
Experimental Data ◽  
Numerical Results ◽  
Benzene Hydrogenation ◽  
Alumina Catalyst ◽  
Temperature Changes ◽  
Catalyst Pellet ◽  
Model Equations ◽  
Catalytic Poison

The diffusion and the shell progressive models of deactivation caused by irreversible chemisorption of a catalytic poison are presented for a single catalyst pellet. The method for solution of the model equations is proposed. The numerical results are compared with experimental data obtained by measuring concentration and temperature changes due to thiophene poisoning in benzene hydrogenation over a nickel-alumina catalyst.

scholarly journals The isotopic constitution and atomic weight of lead from different sources

1933 ◽  
Vol 140 (842) ◽  
pp. 535-543 ◽  
Keyword(s):  
Mass Spectra ◽  
Atomic Weight ◽  
Numerical Results ◽  
Mass Spectrograph ◽  
Different Sources ◽  
Complete Account ◽  
Isotopic Constitution

In continuation of the previous communications on the isotopic constitution of the elements determined by photometry of their mass-spectra this paper contains an account of experiments made on lead. Much of the work was done over a year ago and, on account of their great importance in geological problems, some of the numerical results were published. It seemed desirable that the complete account should include, if possible, results of at least one of those abnormal samples reported to have an atomic weight less than 206. These have now been obtained and as the mass-spectrograph is now being partially reconstructed and may not be available for further work of the same kind for some time further delay is unnecessary. Lead is unique among the elements in that it is formed in workable amounts by different processes of radioactive disintegration and so does not have a constant isotopic constitution. The first mass-spectra showing its lines were obtained with the second mass-spectrograph by a discharge in the tetramethyl made from ordinary lead and indicated isotopes 206, 207, 208 roughly in proportions 4, 3, 7 with possibly others. Two years later a specimen of the methyl compound of lead from Norwegian Broggerite was prepared and analysed. The mass-spectra obtained were poor but enabled the three lines 206, 207, 208 to be identified and their relative intensities roughly estimated at 100, 10·7, and 4·5. At the time there was no reason to suppose that the intensities could be affected by the presence of a hydride, so the percentages were worked out at 86·8, 9·3, 3·9. The presence of line 207 was of the greatest interest for, as was pointed out, there was excellent reason for identifying this with the final product of the actinium series, which would settle the atomic weights of the members of the series, that of protactinium being 231. Assuming the ratio 100 : 7 for the number of atoms of uranium lead to actinium lead Lord Rutherford was able to work out the period of actino-uranium, the parent of the actinium series and an isotope of uranium, to be 4·2 x 10 8 years, and deduce other important cosmical conclusions.

Larger-Eddy Simulation of Velocity Fluctuation in a Mixing T-Junction

2012 ◽  
Vol 152-154 ◽  
pp. 1313-1318
Author(s):  
Tao Lu ◽  
Su Mei Liu ◽  
Ping Wang ◽  
Wei Yyu Zhu
Keyword(s):  
Experimental Data ◽  
Velocity Fluctuation ◽  
Flow Model ◽  
Numerical Results ◽  
Mean Square ◽  
Main Duct ◽  
Velocity Fluctuations ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Les Model

Velocity fluctuations in a mixing T-junction were simulated in FLUENT using large-eddy simulation (LES) turbulent flow model with sub-grid scale (SGS) Smagorinsky–Lilly (SL) model. The normalized mean and root mean square velocities are used to describe the time-averaged velocities and the velocities fluctuation intensities. Comparison of the numerical results with experimental data shows that the LES model is valid for predicting the flow of mixing in a T-junction junction. The numerical results reveal the velocity distributions and fluctuations are basically symmetrical and the fluctuation at the upstream of the downstream of the main duct is stronger than that at the downstream of the downstream of the main duct.

Modeling of Coupled Bending and Torsion in Elastic Structures

1993 ◽  
Author(s):  
H. T. Banks ◽  
C. A. Smith
Keyword(s):  
Experimental Data ◽  
Numerical Results ◽  
Computational Results ◽  
Elastic Structures ◽  
Approximation Techniques ◽  
Flexural Vibrations ◽  
And Control

Abstract In this presentation we will report on joint efforts with D.J. Inman and his colleagues at MSL, SUNY at Buffalo, to develop viable models for the analysis and control of elastic structures exhibiting coupled torsional and flexural vibrations. A model for coupled torsion and bending is developed which incorporates Kelvin Voigt damping and warping. Approximation techniques are introduced and preliminary numerical results are discussed. Experimental data is presented and used to test our computational results.

scholarly journals Mass spectra of the low-lying nonet scalar mesons in the lattice QCD

2010 ◽  
Vol 3 ◽  
pp. 03010 ◽  
Author(s):  
T. Kunihiro ◽  
S. Muroya ◽  
A. Nakamura ◽  
C. Nonaka ◽  
M. Sekiguchi ◽  
...  
Keyword(s):  
Lattice Qcd ◽  
Mass Spectra ◽  
Scalar Mesons

scholarly journals Modelling Macrophage Infiltration into Avascular Tumours

2002 ◽  
Vol 4 (1) ◽  
pp. 21-38 ◽  
Author(s):  
C. E. Kelly ◽  
R. D. Leek ◽  
H. M. Byrne ◽  
S. M. Cox ◽  
A. L. Harris ◽  
...  
Keyword(s):  
Experimental Data ◽  
Mathematical Model ◽  
Spatial Structure ◽  
Random Motion ◽  
Numerical Results ◽  
Macrophage Infiltration ◽  
Numerical Techniques ◽  
Model Predictions ◽  
Independent Experimental Data

In this paper a mathematical model that describes macrophage infiltration into avascular tumours is presented. The qualitative accuracy of the model is assessed by comparing numerical results with independent experimental data that describe the infiltration of macrophages into two types of spheroids: chemoattractant-producing (hepa-1) and chemoattractant-deficient (or C4) spheroids. A combination of analytical and numerical techniques are used to show how the infiltration pattern depends on the motility mechanisms involved (i.e. random motion and chemotaxis) and to explain the observed differences in macrophage infiltration into the hepa-1 and C4 spheroids. Model predictions are generated to show how the spheroid's size and spatial structure and the ability of its constituent cells influence macrophage infiltration. For example, chemoattractant-producing spheroids are shown to recruit larger numbers of macrophages than chemoattractant-deficient spheroids of the same size and spatial structure. The biological implications of these results are also discussed briefly.

scholarly journals Numerical and Experimental Investigation of a Rich Quench Lean Combustor Sector

1996 ◽  
Author(s):  
Johannes W. Koopman ◽  
Peter Griebel ◽  
Christoph Hassa
Keyword(s):  
Experimental Data ◽  
Experimental Investigation ◽  
Numerical Results ◽  
Detailed Knowledge ◽  
Complementary Information ◽  
Species Concentration ◽  
Flow Temperature ◽  
Nox Formation ◽  
Sector Model ◽  
Decisive Importance

The flow in a three sector model, representing a segment of an annular rich quench lean combustor for an aeroengine is investigated. Detailed knowledge of flow, temperature and species concentration distributions is of decisive importance to control the NOx formation, essential to the RQL concept. Velocities, temperatures and species concentrations are measured. They are partly used to aquire data on the inlet boundaries in the numerical calculation and partly used to compare with the numerical results. The calculation reveals many details which are not accesable in the experiment. It also shows the effects of the specific inlet dataset. Experimental data and numerical results furnish complementary information.

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