202 research outputs found
ANCA-positive Vasculitides and Coronary Artery Pathology
Vasculitides constitute a heterogeneous group of disorders affecting from large arteries to post-arteriolar capillaries. These disorders can affect all organs and are categorized on the basis of the affected artery diameter and the presence or absence of antibodies to neutrophil cytoplasmic antigens (ANCA). ANCA-positive vasculitides involve small to medium size arteries of many organs, primarily of the upper and lower respiratory system, the kidneys and the peripheral nervous system. Microscopic polyangiitis (MPA), Wegener granulomatosis (WG) and Churg-Strauss syndrome (CS) are forms of these vasculitides. Coronary arteries have been previously shown to be occasionally affected during the course of these diseases; however, this has never been formally assessed
ANCA-positive Vasculitides and Coronary Artery Pathology
Vasculitides constitute a heterogeneous group of disorders affecting from large arteries to post-arteriolar capillaries. These disorders can affect all organs and are categorized on the basis of the affected artery diameter and the presence or absence of antibodies to neutrophil cytoplasmic antigens (ANCA). ANCA-positive vasculitides involve small to medium size arteries of many organs, primarily of the upper and lower respiratory system, the kidneys and the peripheral nervous system. Microscopic polyangiitis (MPA), Wegener granulomatosis (WG) and Churg-Strauss syndrome (CS) are forms of these vasculitides. Coronary arteries have been previously shown to be occasionally affected during the course of these diseases; however, this has never been formally assessed
Singlet vs Nonsinglet Perturbative Renormalization factors of Staggered Fermion Bilinears
In this paper we present the perturbative computation of the difference
between the renormalization factors of flavor singlet
(, : flavor index) and nonsinglet
() bilinear quark operators
(where ) on the lattice. The computation is performed to
two loops and to lowest order in the lattice spacing, using Symanzik improved
gluons and staggered fermions with twice stout-smeared links. The stout
smearing procedure is also applied to the definition of bilinear operators. A
significant part of this work is the development of a method for treating some
new peculiar divergent integrals stemming from the staggered formalism. Our
results can be combined with precise simulation results for the renormalization
factors of the nonsinglet operators, in order to obtain an estimate of the
renormalization factors for the singlet operators. The results have been
published in Physical Review D.Comment: 8 pages, 3 figures, 2 tables, Proceedings of the 35th International
Symposium on Lattice Field Theory, 18-24 June 2017, Granada, Spai
Confining strings in representations with common -ality
We study the spectrum of confining strings in SU(3) pure gauge theory, by
means of lattice Monte Carlo simulations, using torelon operators in different
representations of the gauge group. Our results provide direct evidence that
the string spectrum is according to predictions based on -ality. Torelon
correlations in the rank-2 symmetric channel appear to be well reproduced by a
two-exponential picture, in which the lowest state is given by the fundamental
string , the heavier string state is such that the ratio
is approximately given by the Casimir ratio , and the torelon has a much smaller overlap with the
lighter fundamental string state.Comment: 7 pages, 2 figure
Wind power potential assessment for seven buoys data collection stations in Aegean Sea using Weibull distribution function
This paper utilizes three hourly measured values of wind speed and direction from
seven buoys data collection stations in Aegean Sea to study the wind speed and
power characteristics applying the Weibull shape and scale parameters.
Specifically, the site dependent, annual and monthly mean patterns of mean wind
speed, Weibull parameters, frequency distribution, most probable wind speed,
maximum energy carrying wind speed, wind power density and wind energy
density characteristics have been studied. The Weibull distribution was found to
represent the wind speed distribution with more than 90% accuracy in most of the
cases. Slightly decreasing trends were observed in annual mean wind speed values
at Lesvos and increasing at Mykonos. The mean values of wind speed, scale
parameter, most probable wind speed, maximum energy carrying wind speed, wind
power and wind energy density values showed higher values during winter time
and lower in summer time. Mykonos was found to be the best site from wind
power harnessing point of view. Moreover, the correlation between the percentages
of times the wind speed was above cut-in-speed and the measured mean wind
speed for the three selected sites and the correlation between the aforementioned
percentages and the scale parameter c were examined and were found linear.http://jrse.aip.org/ai201
Offshore wind speed and wind power characteristics for ten locations in Aegean and Ionian Seas
This paper utilizes wind speed data measured at 3 and 10 m above water surface level using buoys at
10 stations in Ionian and Aegean Seas to understand the behaviour of wind and thereafter energy yield
at these stations using 5 MW rated power offshore wind turbine. With wind power densities of 971
and 693 W/m2 at 50 m above water surface level, Mykonos and Lesvos were found to be superb and
outstanding windy sites with wind class of 7 and 6, respectively. Other locations like Athos, Santorini
and Skyros with wind power density of more than 530 W/m2 and wind class of 5 were found to be the
excellent sites. Around 15–16% higher winds were observed at 10 m compared to that at 3 m. Lower
values of wind speed were found during summer months and higher during winter time in most of the
cases reported in the present work. Slightly decreasing (∼2% per year) linear trends were observed in
annual mean wind speed at Lesvos and Santorini. These trends need to be verified with more data from
buoys or from nearby onshore meteorological stations. At Athos and Mykonos, increasing linear trends
were estimated. At all the stations the chosen wind turbine could produce energy for more than 70% of
the time. The wind speed distribution was found to be well represented by Weibull parameters obtained
using Maximum likelihood method compared to WAsP and Method of Moments.http://www.ias.ac.in/jess/ai201
Spectrum of confining strings in SU(N) gauge theories
We study the spectrum of the confining strings in four-dimensional SU(N)
gauge theories. We compute, for the SU(4) and SU(6) gauge theories formulated
on a lattice, the string tensions sigma_k related to sources with Z_N charge k,
using Monte Carlo simulations. Our results are consistent with the sine formula
sigma_k/sigma = sin k pi/N / sin pi/N for the ratio between sigma_k and the
standard string tension sigma.
For the SU(4) and SU(6) cases the accuracy is approximately 1% and 2%,
respectively. The sine formula is known to emerge in various realizations of
supersymmetric SU(N) gauge theories. On the other hand, our results show
deviations from Casimir scaling. We also discuss an analogous behavior
exhibited by two-dimensional SU(N) x SU(N) chiral models.Comment: Latex, 34 pages, 10 figures. Results of new SU(4) simulations added.
The new data are included in the analysis, leading to improved final
estimates for SU(4). Conclusions unchange
Nonperturbative renormalization of the supercurrent in N=1 supersymmetric Yang-Mills theory
In this work, we study the nonperturbative renormalization of the supercurrent operator in N=1 supersymmetric Yang-Mills theory, using a gauge-invariant renormalization scheme (GIRS). The proposed prescription addresses successfully the unwanted mixing of the supercurrent with other operators of equal or lower dimension, which respect the same global symmetries. This mixing is introduced by the unavoidable breaking of supersymmetry on the lattice. In GIRS all gauge-noninvariant operators, which mix with the supercurrent, are excluded from the renormalization procedure. The one remaining mixing operator is accessible by numerical simulations. We present results for the renormalization of the supercurrent using GIRS. We also compute at one-loop order the conversion matrix which relates the nonperturbative renormalization factors in GIRS to the reference scheme ¯¯¯¯¯¯MS
A facile approach to hydrophilic oxidized fullerenes and their derivatives as cytotoxic agents and supports for nanobiocatalytic systems
A facile, environment-friendly, versatile and reproducible approach to the successful oxidation of fullerenes (oxC60) and the formation of highly hydrophilic fullerene derivatives is introduced. This synthesis relies on the widely known Staudenmaier’s method for the oxidation of graphite, to produce both epoxy and hydroxy groups on the surface of fullerenes (C60) and thereby improve the solubility of the fullerene in polar solvents (e.g. water). The presence of epoxy groups allows for further functionalization via nucleophilic substitution reactions to generate new fullerene derivatives, which can potentially lead to a wealth of applications in the areas of medicine, biology, and composite materials. In order to justify the potential of oxidized C60 derivatives for bio-applications, we investigated their cytotoxicity in vitro as well as their utilization as support in biocatalysis applications, taking the immobilization of laccase for the decolorization of synthetic industrial dyes as a trial case.Peer ReviewedPostprint (published version
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