2,973 research outputs found
chiral WZNW model in superspace
We study the Poisson bracket algebra of the supersymmetric chiral WZNW
model in superspace. It involves two classical r-matrices, one of which comes
from the geometrical constraints implied by supersymmetry. The phase
space itself consists of superfields satisfying constraints involving this
r-matrix. An attempt is made to relax these constraints. The symmetries of the
model are investigated.Comment: 21 page
An integrable deformation of the AdS5 x S5 superstring action
An integrable deformation of the type IIB AdS5xS5 superstring action is presented. The deformed field equations, Lax connection, and k-symmetry transformations are given. The original psu (2,2\4) symmetry is expected to become q deformed.Peer reviewedSubmitted Versio
Percutaneous Coronary Interventions in Stable and Acute Coronary Syndromes: Stent technology, lesion complexity and clinical outcome
__Abstract__
Percutaneous coronary intervention (PCI) has brought a major revolution in the way
we manage coronary artery disease. Since the first intervention by Andreas Grüntzig in
1977, development of the technology has been relentless and today PCI has been
established as one of the major pillars of treatment of coronary heart disease alongside
its medical and surgical solutions.
Stent implantation during PCI has given the needed edge to PCI, not only in restoring
coronary flow but moreover in maintaining it.
The aim of this thesis were to :
1. Determine the long term outcome of drug eluting stent implantation compared
to bare metal stents in the general PCI population and explore clinical benefits of
newer generation drug eluting stents.
2. Examine the clinical outcome of drug eluting stents in patient populations prone to
aggressive coronary artery disease.
3. Analyse determinants and prognostic value of myocardial no reflow after stenting in
acute myocardial infarction.
4. Utilize OCT to gain further insights into intra coronary thrombus and the effects for
stenting and thrombectomy in patients with STEMI.
5. Establish the usefulness of the Syntax score in risk stratification of patients presenting
with ST elevation myocardial infarction.
6. Assess the outcome of drug-eluting stent implantation in bypass grafts and evaluate
a dedicated stent developed for bifurcation stenting including that of the left main
stem
A fast - Monte Carlo toolkit on GPU for treatment plan dose recalculation in proton therapy
In the context of the particle therapy a crucial role is played by Treatment Planning Systems (TPSs), tools aimed to compute and optimize the tratment plan. Nowadays one of the major issues related to the TPS in particle therapy is the large CPU time needed. We developed a software toolkit (FRED) for reducing dose recalculation time by exploiting Graphics Processing Units (GPU) hardware. Thanks to their high parallelization capability, GPUs significantly reduce the computation time, up to factor 100 respect to a standard CPU running software. The transport of proton beams in the patient is accurately described through Monte Carlo methods. Physical processes reproduced are: Multiple Coulomb Scattering, energy straggling and nuclear interactions of protons with the main nuclei composing the biological tissues. FRED toolkit does not rely on the water equivalent translation of tissues, but exploits the Computed Tomography anatomical information by reconstructing and simulating the atomic composition of each crossed tissue. FRED can be used as an efficient tool for dose recalculation, on the day of the treatment. In fact it can provide in about one minute on standard hardware the dose map obtained combining the treatment plan, earlier computed by the TPS, and the current patient anatomic arrangement
A lattice Poisson algebra for the Pohlmeyer reduction of the AdS_5 x S^5 superstring
The Poisson algebra of the Lax matrix associated with the Pohlmeyer reduction
of the AdS_5 x S^5 superstring is computed from first principles. The resulting
non-ultralocality is mild, which enables to write down a corresponding lattice
Poisson algebra.Comment: 5 page
Impact of pharmacist advice on metabolic syndrome
OBJECTIVES: The aim of this study was to
determine the effect of pharmacist intervention on
lifestyle modifications and pharmacological treatment in
overweight and obese patients suffering from metabolic
syndrome.
METHOD: Patients were recruited from the community
setting according to the International Diabetes Federation
definition inclusion criteria for metabolic syndrome.
Anthropometric and biochemical tests were performed
at baseline (t=0). Patients were assessed for medication
compliance, occurrence of side-effects, lifestyle and risk
factors using a questionnaire. Patients were re-assessed
three months after pharmacist intervention (t=1).
KEY FINDINGS: A total of 35 patients participated
in the study. Following pharmacist intervention there was
a statistically significant improvement in compliance to
medications (p=0.005) and statistically significant reduction
in occurrence of side-effects (p=0.009), weight (p=0.005),
waist circumference (p=0.000), body mass index (p=0.005),
fasting blood glucose (p=0.015), total cholesterol (p=0.001)
and triglyceride (p=0.000) levels.
CONCLUSION: Pharmacist intervention improved
patient motivation to change their lifestyle. Pharmacists
can play an important role in the management of metabolic
syndrome.peer-reviewe
Finding the Higgs Boson through Supersymmetry
The study of displaced vertices containing two b--jets may provide a double
discovery at the Large Hadron Collider (LHC): we show how it may not only
reveal evidence for supersymmetry, but also provide a way to uncover the Higgs
boson necessary in the formulation of the electroweak theory in a large region
of the parameter space. We quantify this explicitly using the simplest minimal
supergravity model with bilinear breaking of R-parity, which accounts for the
observed pattern of neutrino masses and mixings seen in neutrino oscillation
experiments.Comment: 7 pages, 7 figures. Final version to appear at PRD. Discussion and
results were enlarge
Towards a quadratic Poisson algebra for the subtracted classical monodromy of symmetric space sine-Gordon theories
Symmetric space sine-Gordon theories are two-dimensional massive integrable field theories, generalising the sine-Gordon and complex sine-Gordon theories. To study their integrability properties on the real line, it is necessary to introduce a subtracted monodromy matrix. Moreover, since the theories are not ultralocal, a regularisation is required to compute the Poisson algebra for the subtracted monodromy. In this article, we regularise and compute this Poisson algebra for certain configurations, and show that it can both satisfy the Jacobi identity and imply the existence of an infinite number of conserved quantities in involution
- …