2,367 research outputs found
Superconducting nanowire quantum interference device based on Nb ultrathin films deposited on self-assembled porous Si templates
Magnetoresistance oscillations were observed on networks of superconducting
ultrathin Nb nanowires presenting evidences of either thermal or quantum
activated phase slips. The magnetic transport data, discussed in the framework
of different scenarios, reveal that the system behaves coherently in the
temperature range where the contribution of the fluctuations is important.Comment: accepted for publication on Nanotechnolog
Study of Scintillator Strip with Wavelength Shifting Fiber and Silicon Photomultiplier
The performance of the cm plastic scintillator
strip with wavelength shifting fiber read-out by two novel photodetectors
called Silicon PhotoMultipliers (SiPMs) is discussed. The advantages of SiPM
relative to the traditional multichannel photomultiplier are shown. Light yield
and light attenuation measurements are presented. This technique can be used in
muon or calorimeter systems.Comment: 9 pages, 5 figure
Quantum phase slips in superconducting Nb nanowire networks deposited on self-assembled Si templates
Robust porous silicon substrates were employed for generating interconnected
networks of superconducting ultrathin Nb nanowires. Scanning electron
microscopy analysis was performed to investigate the morphology of the samples,
which constitute of polycrystalline single wires with grain size of about 10
nm. The samples exhibit nonzero resistance over a broad temperature range below
the critical temperature, fingerprint of phase slippage processes. The
transport data are satisfactory reproduced by models describing both thermal
and quantum fluctuations of the superconducting order parameter in thin
homogeneous superconducting wires.Comment: accepted for publication on Applied Physics Letter
Laboratory stand for research of the workflow in hydrostatic mechanical transmissions
The work of the laboratory stand as a whole as well as its particular elements is described. The effect of
laws of parameters change of hydrostatic transmission fluid machines regulation and the laws of the
braking torque change on the basic parameters of hydrostatic mechanical transmissions of different
structures (two schemes were discussed: the first one with an inlet differential, the second - with an
output differential) at implementation of both acceleration and deceleration processes is determined. The
phenomenon of non-simultaneous translation of operating regimes of fluid machines being a part of the
hydrostatic mechanical transmission with an “output” differential in the areas of zero speed and power
modes is studied
Relativistic effects in proton-induced deuteron break-up at intermediate energies with forward emission of a fast proton pair
Recent data on the reaction pD -> (pp) n with a fast forward pp pair with
very small excitation energy is analyzed within a covariant approach based on
the Bethe-Salpeter formalism. It is demonstrated that the minimum
non-relativistic amplitude is completely masked by relativistic effects, such
as Lorentz boost and the negative-energy P components in the 1S_0
Bethe-Salpeter amplitude of the pp pair
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