4,361 research outputs found
Snowden's revelations and the attitudes of students at Swedish universities
Purpose – Mapping of Swedish students' attitudes toward Snowden's revelations and their effects in the
political and socio-cultural environment of Sweden.
Design/methodology/approach – A questionnaire was answered by 190 Swedish University students.
The quantitative responses to the survey were statistically analysed as well as qualitative considerations
of free text answers.
Findings – Swedish students had a high level of knowledge of Snowden revelations, they actively
searched for information, they gave a positive judgement of Snowden's actions and they were willing to
follow his example in Sweden but not the US. They trusted their country and most of its institutions and
authorities except for secret service agencies and Internet and computer software companies.
Practical implications – Design of education for university students, especially in Information
Technology programs.
Social implications – Developing and applying policies on privacy, surveillance and whistleblowing.
Originality/value – This study is part of a bigger international study to map students' attitudes toward
Snowden's revelations and their opinions about privacy, surveillance and whistleblowing opening up for
cross-cultural analyses. This record was migrated from the OpenDepot repository service in June, 2017 before shutting down
Structure of the Fulde-Ferrell-Larkin-Ovchinnikov state in two-dimensional superconductors
Nonuniform superconducting state due to strong spin magnetism is studied in
two-dimensional type-II superconductors near the second order phase transition
line between the normal and the superconducting states. The optimum spatial
structure of the orderparameter is examined in systems with cylindrical
symmetric Fermi surfaces. It is found that states with two-dimensional
structures have lower free energies than the traditional one-dimensional
solutions, at low temperatures and high magnetic fields. For s-wave pairing,
triangular, square, hexagonal states are favored depending on the temperature,
while square states are favored at low temperatures for d-wave pairing. In
these states, orderparameters have two-dimensional structures such as square
and triangular lattices.Comment: 11 pages (LaTeX, revtex.sty), 3 figures; added reference
Magnetic Determination of under Accurate Alignment in (TMTSF)ClO
Cantilever magnetometry has been used to measure the upper critical magnetic
field of the quasi-one dimensional molecular organic superconductor
(TMTSF)ClO. From simultaneous resistivity and torque magnetization
experiments conducted under precise field alignment, at low
temperature is shown to reach 5T, nearly twice the Pauli paramagnetic limit
imposed on spin singlet superconductors. These results constitute the first
thermodynamic evidence for a large in this system and provide support
for spin triplet pairing in this unconventional superconductorComment: Submitted July 1, 2003, Accepted December 9, 2003, Physical Review
Letter
Anomalous In-Plane Anisotropy of the Onset of Superconductivity in (TMTSF)2ClO4
We report the magnetic field-amplitude and field-angle dependence of the
superconducting onset temperature Tc_onset of the organic superconductor
(TMTSF)2ClO4 in magnetic fields H accurately aligned to the conductive ab'
plane. We revealed that the rapid increase of the onset fields at low
temperatures occurs both for H // b' and H // a, irrespective of the carrier
confinement. Moreover, in the vicinity of the Pauli limiting field, we report a
shift of a principal axis of the in-plane field-angle dependence of Tc_onset
away from the b' axis. This feature may be related to an occurrence of
Fulde-Ferrell-Larkin-Ovchinnikov phases.Comment: 4 pages, 4 figure
Initial wave packets and the various power-law decreases of scattered wave packets at long times
The long time behavior of scattered wave packets from a
finite-range potential is investigated, by assuming to be
initially located outside the potential. It is then shown that can
asymptotically decrease in the various power laws at long time, according to
its initial characteristics at small momentum. As an application, we consider
the square-barrier potential system and demonstrate that exhibits
the asymptotic behavior , while another behavior like can
also appear for another .Comment: 5 pages, 1 figur
Tropical Krichever construction for the non-periodic box and ball system
A solution for an initial value problem of the box and ball system is
constructed from a solution of the periodic box and ball system. The
construction is done through a specific limiting process based on the theory of
tropical geometry. This method gives a tropical analogue of the Krichever
construction, which is an algebro-geometric method to construct exact solutions
to integrable systems, for the non-periodic system.Comment: 13 pages, 1 figur
Determinant Structure of the Rational Solutions for the Painlev\'e IV Equation
Rational solutions for the Painlev\'e IV equation are investigated by Hirota
bilinear formalism. It is shown that the solutions in one hierarchy are
expressed by 3-reduced Schur functions, and those in another two hierarchies by
Casorati determinant of the Hermite polynomials, or by special case of the
Schur polynomials.Comment: 19 pages, Latex, using theorem.st
Energy from the gauge invariant observables
For a classical solution |Psi> in Witten's cubic string field theory, the
gauge invariant observable is conjectured to be equal to the
difference of the one-point functions of the closed string state corresponding
to V, between the trivial vacuum and the one described by |Psi>. For a static
solution |Psi>, if V is taken to be the graviton vertex operator with vanishing
momentum, the gauge invariant observable is expected to be proportional to the
energy of |Psi>. We prove this relation assuming that |Psi> satisfies equation
of motion and some regularity conditions. We discuss how this relation can be
applied to various solutions obtained recently.Comment: 27 pages; v5: minor revision in section 2, results unchange
Phase Diagram of Pressure-Induced Superconductivity in EuFe2As2 Probed by High-Pressure Resistivity up to 3.2 GPa
We have constructed a pressuretemperature () phase diagram of
-induced superconductivity in EuFeAs single crystals, via
resistivity () measurements up to 3.2 GPa. As hydrostatic pressure is
applied, an antiferromagnetic (AF) transition attributed to the FeAs layers at
shifts to lower temperatures, and the corresponding resistive
anomaly becomes undetectable for 2.5 GPa. This suggests that the
critical pressure where becomes zero is about 2.5
GPa. We have found that the AF order of the Eu moments survives up to
3.2 GPa without significant changes in the AF ordering temperature
. The superconducting (SC) ground state with a sharp transition
to zero resistivity at 30 K, indicative of bulk
superconductivity, emerges in a pressure range from 2.5
GPa to 3.0 GPa. At pressures close to but outside the SC phase, the
curve shows a partial SC transition (i.e., zero resistivity is not
attained) followed by a reentrant-like hump at approximately
with decreasing temperature. When nonhydrostatic pressure with a uniaxial-like
strain component is applied using a solid pressure medium, the partial
superconductivity is continuously observed in a wide pressure range from 1.1
GPa to 3.2 GPa.Comment: 7 pages, 6 figures, accepted for publication in Physical Review B,
selected as "Editors' Suggestion
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