3,217 research outputs found
The orbit method solution for the deformed three coupled scalar fields
In this work, we present a deformed solutions starting from systems of three
coupled scalar fields with super-potential by orbit
method. First, we deform the corresponding super-potential and obtain defect
solutions. It is shown that how to construct new models altogether with its
defect solutions in terms of the non-deformed model. Therefore, we draw the
graph of super-potential and different fields in terms of So we observe
that the graphs for deformed and non - deformed cases are changed by the scale.Comment: 9 pages, 5 figure
Thermodynamics of string black hole with hyperscaling violation
In this paper, we start with black brane and construct specific space-time
which violates hyperscaling. In order to obtain the string solution we apply
Null-Melvin-Twist and -reduction. By using the difference action method we
study thermodynamics of system to obtain Hawking-Page phase transition. In
order to have hyperscaling violation we need to consider
In that case the free energy is always negative and our solution is thermal
radiation without a black hole. Therefore we find that there is not any
Hawking-Page transition. Also, we discuss the stability of system and all
thermodynamical quantities.Comment: 12 pages. Accepted for publication in EPJ
Asymptomatic bacteriuria and pyuria in patients with chronic renal failure undergoing hemodialysis at dialysis centers in Kermanshah, Iran
Pyuria is the presence of increased numbers of polymorphonuclear leukocytes in the urine and is evidence of an inflammatory response in the Urinary Tract Infection (UTI). The aim of this study is determination asymptomatic bacteriuria and pyuria in patients undergoing hemodialysis with chronic renal failure. Out of 103 patients with renal failure undergoing hemodialysis who were able to produce urine with clean catch way, we received urine sample. All samples were examined by the Microbiologist in Central Laboratory of Kermanshah, Iran. The mean age for the patients at diagnosis was 42.4 years (range, 20-67 years). Sixty-four patients (62.5) were male and thirty-nine (37.5) were female. Results have been showed 39 cases were aged between 44-49 years and the highest number cases were middle-aged. Out of 31 patients with leukocytosis, 14 patients had age between 44-49 years and majority of them were male. Pyuria(>10 WBC/HPF or 10 WBC/HPF) developed colony count more than 105 colony-forming units per milliliter that indicating positive culture. Microorganisms didn�t grow in patients (10/19) with pyuria (10 WBC/HPF is a good marker for significant bacteriuria in these patients. © 2015 Academic Journals Inc
High Sensitivity AC Field Measurement Using Rhombic Inducer
The principle behind the ac field measurement (ACFM) technique has been explained in [1]. In this technique, a thin-skin eddy current is induced in the metal under test. The current is perturbed by defects in the metal surface and the result is reflected in the magnetic field above the surface. A probe is used to detect perturbations in this field
A Multi-scale Approach for Simulations of Kelvin Probe Force Microscopy with Atomic Resolution
The distance dependence and atomic-scale contrast observed in nominal contact
potential difference (CPD) signals recorded by KPFM on surfaces of insulating
and semiconducting samples, have stimulated theoretical attempts to explain
such effects. We attack this problem in two steps. First, the electrostatics of
the macroscopic tip-cantilever-sample system is treated by a finite-difference
method on an adjustable nonuniform mesh. Then the resulting electric field
under the tip apex is inserted into a series of atomistic wavelet-based density
functional theory (DFT) calculations. Results are shown for a realistic neutral
but reactive silicon nano-scale tip interacting with a NaCl(001) sample.
Bias-dependent forces and resulting atomic displacements are computed to within
an unprecedented accuracy. Theoretical expressions for amplitude modulation
(AM) and frequency modulation (FM) KPFM signals and for the corresponding local
contact potential differences (LCPD) are obtained by combining the macroscopic
and atomistic contributions to the electrostatic force component generated at
the voltage modulation frequency, and evaluated for several tip oscillation
amplitudes A up to 10 nm. Being essentially constant over a few Volts, the
slope of atomistic force versus bias is the basic quantity which determines
variations of the atomic-scale LCPD contrast. Already above A = 0.1 nm, the
LCPD contrasts in both modes exhibit almost the same spatial dependence as the
slope. In the AM mode, this contrast is approximately proportional to
, but remains much weaker than the contrast in the FM mode, which
drops somewhat faster as A is increased. These trends are a consequence of the
macroscopic contributions to the KPFM signal, which are stronger in the AM-mode
and especially important if the sample is an insulator even at sub-nanometer
separations where atomic-scale contrast appears.Comment: 19 pages, 13 figure
Fast directional spatially localized spherical harmonic transform
We propose a transform for signals defined on the sphere that reveals their
localized directional content in the spatio-spectral domain when used in
conjunction with an asymmetric window function. We call this transform the
directional spatially localized spherical harmonic transform (directional
SLSHT) which extends the SLSHT from the literature whose usefulness is limited
to symmetric windows. We present an inversion relation to synthesize the
original signal from its directional-SLSHT distribution for an arbitrary window
function. As an example of an asymmetric window, the most concentrated
band-limited eigenfunction in an elliptical region on the sphere is proposed
for directional spatio-spectral analysis and its effectiveness is illustrated
on the synthetic and Mars topographic data-sets. Finally, since such typical
data-sets on the sphere are of considerable size and the directional SLSHT is
intrinsically computationally demanding depending on the band-limits of the
signal and window, a fast algorithm for the efficient computation of the
transform is developed. The floating point precision numerical accuracy of the
fast algorithm is demonstrated and a full numerical complexity analysis is
presented.Comment: 12 pages, 5 figure
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