1,992 research outputs found
Suppression of Superconducting Critical Current Density by Small Flux Jumps in Thin Films
By doing magnetization measurements during magnetic field sweeps on thin
films of the new superconductor , it is found that in a low temperature
and low field region small flux jumps are taking place. This effect strongly
suppresses the central magnetization peak leading to reduced nominal
superconducting critical current density at low temperatures. A borderline for
this effect to occur is determined on the field-temperature (H-T) phase
diagram. It is suggested that the small size of the flux jumps in films is due
to the higher density of small defects and the relatively easy thermal
diffusion in thin films in comparison with bulk samples.Comment: 7 figures Phys. Rev. B accepted scheduled issue: 01 Feb 200
CP Asymmetry for Inclusive Decay in the Minimal Supersymmetric Standard Model
We study the inclusive rare decay in the supergravity
inspired Minimal Supersymmetric Standard Model and compute the CP-asymmetry in
the decay rates. We show that there exist two phenomenologically acceptable
sets of SUSY parameters: for one set the CP-asymmetry has the same (positive)
sign as in the Standard Model and lies in the range (5-45)% while for the other
set it is negative with values within -(2-21)%.Comment: 15 pages, uses axodraw.st
Emerging global resources management issues that cannot be ignored in any forest and ecosystem science education programme
Simulating (electro)hydrodynamic effects in colloidal dispersions: smoothed profile method
Previously, we have proposed a direct simulation scheme for colloidal
dispersions in a Newtonian solvent [Phys.Rev.E 71,036707 (2005)]. An improved
formulation called the ``Smoothed Profile (SP) method'' is presented here in
which simultaneous time-marching is used for the host fluid and colloids. The
SP method is a direct numerical simulation of particulate flows and provides a
coupling scheme between the continuum fluid dynamics and rigid-body dynamics
through utilization of a smoothed profile for the colloidal particles.
Moreover, the improved formulation includes an extension to incorporate
multi-component fluids, allowing systems such as charged colloids in
electrolyte solutions to be studied. The dynamics of the colloidal dispersions
are solved with the same computational cost as required for solving
non-particulate flows. Numerical results which assess the hydrodynamic
interactions of colloidal dispersions are presented to validate the SP method.
The SP method is not restricted to particular constitutive models of the host
fluids and can hence be applied to colloidal dispersions in complex fluids
Pair correlation analysis of Fixed Photoactivatable Analysis of Live PALM applied on the Water Channel Aquaporin -3
On the existence of supergravity duals to D1--D5 CFT states
We define a metric operator in the 1/2-BPS sector of the D1-D5 CFT, the
eigenstates of which have a good semi-classical supergravity dual; the
non-eigenstates cannot be mapped to semi-classical gravity duals. We also
analyse how the data defining a CFT state manifests itself in the gravity side,
and show that it is arranged into a set of multipoles. Interestingly, we find
that quantum mechanical interference in the CFT can have observable
manifestations in the semi-classical gravity dual. We also point out that the
multipoles associated to the normal statistical ensemble fluctuate wildly,
indicating that the mixed thermal state should not be associated to a
semi-classical geometry.Comment: 22 pages, 2 figures. v2 : references added, typos correcte
Occurrences of mild compression wood in agathis borneensis and dacrydium elatum
Studies on the compression wood in tropical gymnosperms are uncommon due
to their limited distribution and over-exploitation. Microscopic examination of
the heartwood of two tropical gymnosperms, Agathis borneensis (local name:
bindang, damar minyak) and Dacrydium elatum (local name: sempilor) growing
on higher elevations in Sarawak, Malaysia showed the occurrence of mild
compression wood. Intercellular spaces were present in the compression wood
of A. borneensis, but not in D. elatum. Rounded shapes of tracheids, typical of
severe compression wood, were not observed in any of the samples examined.
In D. elatum helical cavities were present, which corresponded in location to
cell wall checks seen in cross-sectional views. The S1 layer was relatively thick
in both wood species but a distinct S3 layer was observable only in the mild
compression wood of D. elatum. Although the main feature of the mild compression
wood tracheids of both wood species was greater lignification of the
outer S2 region, autofluorescence and KMnO4 staining showed the fluorescence
and staining intensity in the corner middle lamella in some cases to be much
stronger than that in the outer part of S2 layer
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