1,109 research outputs found
Enhancement of Tc by Sr substitution for Ba in Hg-2212 superconductor
The Ba substitution by Sr has been studied in two Hg-2212 series:
Hg2(Ba(1-y)Sr(y))2YCu2O8-d and Hg2(Ba(1-y)Sr(y))2(Y0.80Ca0.20)Cu2O8-d. In both
series a Tc enhancement of about 40 K is observed when Sr substitutes Ba from y
= 0 to y = 1.0.
The y = 0 compound of the first series is the non superconducting
Hg2Ba2YCu2O8-d prototype. In the second series, this y = 0 compound is already
superconducting at 21 K. Indeed the members of this series present a higher
charge carrier density in their CuO2 superconducting planes than their
homologues of the first series due to the doping introduced by the substitution
of 20% of Y by Ca. The compounds of both series were synthesized in high
pressure (3.5 GPa) - high temperature (950 - 1050C) conditions. In both cases
Sr substitution was successful up to the full replacement of Ba (y = 1.0). The
Hg-2212 phases were characterized by XRD, SEM, EDX and a.c. susceptibility.Comment: 14 pages, 7 figures, accepted for publication in Physica
Understanding and modeling turbulent fluxes and entrainment in a gravity current
International audienceWe present an experimental study of the mixing processes in a gravity current flowing on an inclined plane. The turbulent transport of momentum and density can be described in a very direct and compact form by a Prandtl mixing length model: the turbulent vertical fluxes of momentum and density are found to scale quadratically with the vertical mean gradients of velocity and density. The scaling coefficient, the square of the mixing length, is approximately constant over the mixing zone of the stratified shear layer. We show how, in different flow configurations, this length can be related to the shear length of the flow (Δ/â z u^3)^1/2. We also study the fluctuations of the momentum and density turbulent fluxes, showing how they relate to mixing and to the entrainment/detrainment balance. We suggest a quantitative measure of local entrainment and detrainment derived from observed conditional correlations of density flux and density or vertical velocity fluctuations
Mechanical Design of the Intensity Measurement Devices for the LHC
The intensity measurement for the LHC ring is provided by eight current transformers (2ĂDCCT, 2ĂFBCT per beam). The measurement resolution of 1?Arms at 1s average for the DCCTs and ±10^9p in 25ns for the FBCTs is required. Such constraints call for low noise electronics and a compact magnetically shielded mechanical design. Correct integration of these devices into the vacuum system also requires the vacuum chambers equipped with the non-evaporable getter (NEG) film. The NEG is activated by heating the vacuum chamber to 200?C and more. Such temperatures affect the structure of the magnetic materials, which form the base part of the intensity measurement devices, and degrade their performace. A cooling circuit is needed. Due to the mechanical constraints, the cooling circuit, as well as heating element must form an integral part of the design. The aim of this paper is to present the solutions to these problems and discuss the mechanical construction of the DCCTs and FBCTs currently being installed in the LHC
High-temperature oxygen non-stoichiometry, conductivity and structure in strontium-rich nickelates La2-xSrxNiO4-\delta (x = 1 and 1.4)
Oxygen nonstoichiometry, electrical conductivity and thermal expansion of La2
xSrxNiO4-\delta phases with high levels of strontium substitution (1 =< x =<
1.4) have been investigated in air and oxygen atmosphere in the temperature
range 20-1050 degrees C. These phases retain the K2NiF4-type structure of
La2NiO4 (tetragonal, space group I4/mmm). The oxygen vacancy fraction was
determined independently from thermogravimetric and neutron diffraction
experiments, and is found to increase considerably on heating. The electrical
resistivity, thermal expansion and cell parameters with temperature show
peculiar variations with temperature, and differ notably from
La2NiO4\delta in this respect. These variations are tentatively correlated
with the evolution of nickel oxidation state, which crosses from a Ni3+/Ni4+ to
a Ni2+/Ni3+ equilibrium on heating
Nonlinear internal wave penetration via parametric subharmonic instability
We present the results of a laboratory experimental study of an internal wave field generated by harmonic, spatially periodic boundary forcing from above of a density stratification comprising a strongly stratified, thin upper layer sitting atop a weakly stratified, deep lower layer. In linear regimes, the energy flux associated with relatively high frequency internal waves excited in the upper layer is prevented from entering the lower layer by virtue of evanescent decay of the wave field. In the experiments, however, we find that the development of parametric subharmonic instability in the upper layer transfers energy from the forced primary wave into a pair of subharmonic daughter waves, each capable of penetrating the weakly stratified lower layer. We find that around 10% of the primary wave energy flux penetrates into the lower layer via this nonlinear wave-wave interaction for the regime we study.ONLITUR ((No. ANR-2011-BS04-006-01)National Science Foundation (U.S.) (No. OCE-1357434
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