CERN Accelerating science

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2014-04-15
04:30
Physical modeling of the soil swelling curve vs. the shrinkage curve / Chertkov, V Y
Physical understanding of the links between soil swelling, texture, structure, cracking, and sample size is of great interest for the physical understanding of many processes in the soil-air-water system and for applications in civil, agricultural, and environmental engineering. The background of this work is an available chain of interconnected physical shrinkage curve models for clay, intra-aggregate matrix, aggregated soil without cracks, and soil with cracks. [...]
arXiv:1404.3506.- 2014 - 38 p. - Published in : Advances in Water Resources 44 (2012) 66-84 External link: Preprint

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2014-04-15
04:30
Effect of the number of vortices on the torque scaling in Taylor-Couette flow / Martínez-Arias, B ; Peixinho, J ; Crumeyrolle, O ; Mutabazi, I
Torque measurements in Taylor-Couette flow, with large radius ratio and large aspect ratio, over a range of velocities up to a Reynolds number of 24 000 are presented. Following a specific procedure, nine states with distinct number of vortices along the axis were found and the aspect ratio of the vortices were measured. [...]
arXiv:1404.3505.- 2014 - 11 p. External link: Preprint

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2014-04-15
04:30
The Lorentz force law and its connections to hidden momentum, the Einstein-Laub force, and the Aharonov-Casher effect / Mansuripur, Masud
The Lorentz force of classical electrodynamics, when applied to magnetic materials, gives rise to hidden energy and hidden momentum. Removing the contributions of hidden entities from the Poynting vector, from the electromagnetic momentum density, and from the Lorentz force and torque densities simplifies the equations of the classical theory. [...]
arXiv:1404.3261.- 2014 - 18 p. - Published in : Published in IEEE Transactions on Magnetics, Vol. 50, No. 4, 1300110, pp1-10 (April 2014) External link: Preprint

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2014-04-15
04:30
Relativistic heavy-ion collisions / Bhalerao, Rajeev S (Tata Inst.)
The field of relativistic heavy-ion collisions is introduced to the high-energy physics students with no prior knowledge in this area. The emphasis is on the two most important observables, namely the azimuthal collective flow and jet quenching, and on the role fluid dynamics plays in the interpretation of the data. [...]
arXiv:1404.3294.- 2014 - 21 p. External link: Preprint
In : 1st Asia-Europe-Pacific School of High-Energy Physics, Fukuoka, Japan, 14 - 27 Oct 2012, pp.219-239

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2014-04-15
04:29
Spacetime-symmetry violations: motivations, phenomenology, and tests / Lehnert, Ralf
An important open question in fundamental physics concerns the nature of spacetime at distance scales associated with the Planck length. The widespread belief that probing such distances necessitates Planck-energy particles has impeded phenomenological and experimental research in this context. [...]
arXiv:1404.3670.- 2014 - 10 p. - Published in : Physics Procedia 17 (2011) 135 External link: Preprint

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2014-04-15
04:25
Oscillator Models of the Solar Cycle and the Waldmeier Effect / Nagy, M ; Petrovay, K
We study the behaviour of the van der Pol oscillator when either its damping parameter $\mu$ or its nonlinearity parameter $\xi$ is subject to additive or multiplicative random noise. Assuming various power law exponents for the relation between the oscillating variable and the sunspot number, for each case we map the parameter plane defined by the amplitude and the correlation time of the perturbation and mark the parameter regime where the sunspot number displays solar-like behaviour. [...]
arXiv:1404.3668.- 2014 - 4 p. - Published in : Astron. Nachr. 334 (2013) 964-967 External link: Preprint

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2014-04-15
04:24
From inflation to late time acceleration with a decaying vacuum coupled to radiation or matter / Fay, Stéphane
We consider General Relativity with matter and radiation, one of these fluids being coupled to vacuum. We find that Universe dynamics starts by an inflation phase if the coupled fluid has a negative energy density at early time. [...]
arXiv:1404.3518.- 2014 - 9 p. - Published in : Phys. Rev. D 89 (2014) 063514 External link: Preprint

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2014-04-15
04:24
Investigation of Dense Gas Towards Relativistic Outflow Sources / Hawkes, J ; Rowell, G ; Dawson, B ; Aharonian, F ; Burton, M ; Fukui, Y ; Furukawa, N ; Hayakawa, T ; Kawamura, A ; Maxted, N et al.
We probe the interstellar medium towards the objects Circinus X-1, a low-mass X-ray binary with relativistic jets; and the highly energetic Westerlund 2 stellar cluster, which is located towards TeV gamma-ray emission and interesting arc- and jet-like features seen in Nanten 12CO data. We have mapped both regions with the Mopra radio telescope, in 7 mm and 12 mm wavebands, looking for evidence of disrupted/dense gas caused by the interaction between high energy outflows and the ISM. [...]
arXiv:1404.3463.- 2014 - 4 p. - Published in : Int. J. Mod. Phys. Conf. Ser. 28 (2014) 1460198 External link: Preprint

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2014-04-15
04:24
A new library of theoretical stellar spectra with scaled-solar and alpha-enhanced mixtures / Coelho, P R T
Theoretical stellar libraries have been increasingly used to overcome limitations of empirical libraries, e.g. by exploring atmospheric parameter spaces not well represented in the latter. [...]
arXiv:1404.3243.- 2014 - Published in : 2014MNRAS.440.1027C External link: Preprint

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2014-04-14
14:37
Recent results of the ATLAS Upgrade Planar Pixel Sensors R&D Project / Marchiori,G (LPNHE)
The ATLAS detector has to undergo significant updates at the end of the current decade, in order to withstand the increased occupancy and radiation damage that will be produced by the highluminosity upgrade of the Large Hadron Collider. In this presentation we give an overview of the recent accomplishments of the R&D; activity on the planar pixel sensors for the ATLAS Inner Detector upgrade..
AIDA-CONF-2014-017.- Geneva : CERN, 2014 Fulltext: PDF;
In : 10th International Conference on Large Scale Applications and Radiation Hardness of Semiconductor Detectors, Florence, Italy, 6 - 8 Jul 2011

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