873 research outputs found
Self field measurements by Hall sensors on the SeCRETS short sample CICC's subjected to cyclic load
An imbalance in the transport current among the strands of a Cable-in-Conduit conductors (CICC) can be associated with the change of their performance. In order to understand and improve the performance of CICC's, it is essential to study the current imbalance. This paper focuses on the study of the current imbalance in two short samples of the SeCRETS (Segregated Copper Ratio Experiment on Transient Stability) conductors subjected to a cyclic load in the SULTAN facility. The self field around the conductors was measured on four locations by 32 miniature Hall sensors for a reconstruction of the current distribution. The results of the self field measurements in the DC tests are presented and discussed
Vacuum energy induced by an impenetrable flux tube of finite radius
We consider the effect of the magnetic field background in the form of a tube
of the finite transverse size on the vacuum of the quantized charged massive
scalar field which is subject to the Dirichlet boundary condition at the edge
of the tube. The vacuum energy is induced, being periodic in the value of the
magnetic flux enclosed in the tube. Our previous study in J. Phys. A: Vol.43,
175401 (2010) is extended to the case of smaller radius of the tube and larger
distances from it. The dependence of the vacuum energy density on the distance
from the tube and on the coupling to the space-time curvature scalar is
comprehensively analyzed.Comment: 11 pages, 8 figures, journal version, abstract extended. arXiv admin
note: substantial text overlap with arXiv:0911.287
Two-particle multiplets splitting as a guideline in nucleon pairing estimations
The ground state multiplet structure for nuclei over the wide range of mass
number was calculated in -approximation and different mass
relations for pairing energy was analysed in this work. Correlation between the
calculated multiplet structure and experimental data offer a guideline in
deciding between mass relations for nucleon pairing.Comment: 6 pages, 2 fig., Proceedings of Intern. Session-Conference of the
Section of Nuclear Physics of PSD RAS (April 12 - 15, 2016, JINR Dubna), to
be published in Journal Physics of Elementary Particles and Atomic Nuclei
(PEPAN
Possibility of local pair existence in optimally doped SmFeAsO(1-x) in pseudogap regime
We report the analysis of pseudogap Delta* derived from resistivity
experiments in FeAs-based superconductor SmFeAsO(0.85), having a critical
temperature T_c = 55 K. Rather specific dependence Delta*(T) with two
representative temperatures followed by a minimum at about 120 K was observed.
Below T_s = 147 K, corresponding to the structural transition in SmFeAsO,
Delta*(T) decreases linearly down to the temperature T_AFM = 133 K. This last
peculiarity can likely be attributed to the antiferromagnetic (AFM) ordering of
Fe spins. It is believed that the found behavior can be explained in terms of
Machida, Nokura, and Matsubara (MNM) theory developed for the AFM
superconductors.Comment: 5 pages, 2 figure
Polarization of the vacuum of a quantized scalar field by an impenetrable magnetic vortex of finite thickness
We consider the effect of the magnetic field background in the form of a tube
of the finite transverse size on the vacuum of the quantized charged massive
scalar field which is subject to the Dirichlet boundary condition at the tube.
It is shown that, if the Compton wavelength associated with the scalar field
exceeds considerably the transverse size of the tube, then the vacuum energy
which is finite and periodic in the value of the magnetic flux enclosed in the
tube is induced on a plane transverse to the tube. Some consequences for
generic features of the vacuum polarization in the cosmic-string background are
discussed.Comment: 13 pages, 10 figures, journal version, minor changes, some references
adde
Semiclassical treatment of logarithmic perturbation theory
The explicit semiclassical treatment of logarithmic perturbation theory for
the nonrelativistic bound states problem is developed. Based upon
-expansions and suitable quantization conditions a new procedure for
deriving perturbation expansions for the one-dimensional anharmonic oscillator
is offered. Avoiding disadvantages of the standard approach, new handy
recursion formulae with the same simple form both for ground and exited states
have been obtained. As an example, the perturbation expansions for the energy
eigenvalues of the harmonic oscillator perturbed by are
considered.Comment: 6 pages, LATEX 2.09 using IOP style
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