23,639 research outputs found
New nonlinear coherent states and some of their nonclassical properties
We construct a displacement operator type nonlinear coherent state and
examine some of its properties. In particular it is shown that this nonlinear
coherent state exhibits nonclassical properties like squeezing and
sub-Poissonian behaviour.Comment: 3 eps figures. to appear in J.Opt
Potential algebra approach to position dependent mass Schroedinger equation
It is shown that for a class of position dependent mass Schroedinger equation
the shape invariance condition is equivalent to a potential symmetry algebra.
Explicit realization of such algebras have been obtained for some shape
invariant potentials
Thermo-magnetic history effects in the vortex state of YNi_2B_2C superconductor
The nature of five-quadrant magnetic isotherms for is different from that for
in a single crystal of YNi2B2C, pointing towards an anisotropic behaviour of
the flux line lattice (FLL). For, a well defined peak effect (PE) and second
magnetization peak (SMP) can be observed and the loop is open prior to the PE.
However, for, the loop is closed and one can observe only the PE. We have
investigated the history dependence of magnetization hysteresis data for by
recording minor hysteresis loops. The observed history dependence in across
different anomalous regions are rationalized on the basis of
su-perheating/supercooling of the vortex matter across the first-order-like
phase transition and possible additional effects due to annealing of the
disordered vortex bundles to the underlying equilibrium state.Comment: 4 pages, 4 figure
People who inject drugs experiences of skin and soft tissue infections and harm reduction: A qualitative study.
Background: Bacterial skin and soft tissue infections (SSTI) among people who inject drugs (PWID) are considered a public health concern. There is a lack of qualitative research examining the lived experience of PWID who have had SSTI. This paper explores PWID views and experiences of their SSTI, their perceptions on the causes of their SSTI and their harm reduction (HR) behaviours. The implications for HR service delivery and practice will be discussed.
Methods: Between October 2015-January 2016, 22 in-depth interviews were conducted with PWID who had experienced a SSTI within the past year. Interviewees were recruited from an injecting equipment provision service and a drug treatment service in Glasgow and Edinburgh respectively. The interview transcripts were transcribed verbatim and underwent thematic analysis.
Results: We found that the experience of SSTI can cause strong negative feelings, including panic and stigma and that there was limited knowledge of SSTI prior to first hand experience. The awareness of the unacceptable social and physical consequences of SSTI fostered a sense of personal responsibility and agency which led to the introduction or improved HR uptake. However, when PWID were struggling to inject or when their physical and political environments were compromised there was an increased risk for SSTI and reduced effectiveness of HR.
Conclusion: Compared to HCV and HIV, SSTI as an injecting related harm has received less policy attention. Policy makers need to address SSTI HR within enabling environments, such as ‘safer environment interventions’. It is recommended that peer based support, improved NSP provision and medically supervised injecting facilities are needed to deliver SSTI HR
Soliton response to transient trap variations
The response of bright and dark solitons to rapid variations in an expulsive
longitudinal trap is investigated. We concentrate on the effect of transient
changes in the trap frequency in the form of temporal delta kicks and the
hyperbolic cotangent functions. Exact expressions are obtained for the soliton
profiles. This is accomplished using the fact that a suitable linear
Schrodinger stationary state solution in time can be effectively combined with
the solutions of non-linear Schrodinger equation, for obtaining solutions of
the Gross-Pitaevskii equation with time dependent scattering length in a
harmonic trap. Interestingly, there is rapid pulse amplification in certain
scenarios
Fusion of Li with Tb} at near barrier energies
Complete and incomplete fusion cross sections for Li+Tb have
been measured at energies around the Coulomb barrier by the -ray
method. The measurements show that the complete fusion cross sections at
above-barrier energies are suppressed by 34% compared to the coupled
channels calculations. A comparison of the complete fusion cross sections at
above-barrier energies with the existing data of B+Tb and
Li+Tb shows that the extent of suppression is correlated with the
-separation energies of the projectiles. It has been argued that the Dy
isotopes produced in the reaction Li+Tb, at below-barrier
energies are primarily due to the -transfer to unbound states of Tb,
while both transfer and incomplete fusion processes contribute at above-barrier
energies.Comment: Phys. Rev. C (accepted
Interesting thermomagnetic history effects in the antiferromagnetic state of SmMn_2Ge_2
We present results of magnetization measurements showing that the magnetic
response of the antiferromagnetic state of SmMn_2Ge_2 depends on the path used
in the field(H)-temperature(T) phase space to reach this state. Distinct
signature of metastablity is observed in this antiferromagnetic state when
obtained via field-cooling/field-warming paths. The isothermal M-H loops show
lack of end-point memory, reminiscent of that seen in metastable vortex states
near the field-induced first order phase transition in various type-II
superconductors.Comment: 11 pages of text and 3 figure
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