20 research outputs found
Excitation function of elliptic flow in Au+Au collisions and the nuclear matter equation of state
We present measurements of the excitation function of elliptic flow at
midrapidity in Au+Au collisions at beam energies from 0.09 to 1.49 GeV per
nucleon. For the integral flow, we discuss the interplay between collective
expansion and spectator shadowing for three centrality classes. A complete
excitation function of transverse momentum dependence of elliptic flow is
presented for the first time in this energy range, revealing a rapid change
with incident energy below 0.4 AGeV, followed by an almost perfect scaling at
the higher energies. The equation of state of compressed nuclear matter is
addressed through comparisons to microscopic transport model calculations.Comment: 10 pages, 4 eps figures, submitted for publication. Data files will
be available at http://www.gsi.de/~fopiwww/pub
Differential directed flow in Au+Au collisions
We present experimental data on directed flow in semi-central Au+Au
collisions at incident energies from 90 to 400 A MeV. For the first time for
this energy domain, the data are presented in a transverse momentum
differential way. We study the first order Fourier coefficient v1 for different
particle species and establish a gradual change of its patterns as a function
of incident energy and for different regions in rapidity.Comment: 5 pages, Latex, 5 eps figures, accepted for publication in Phys. Rev.
C (Rapid Communications). Data files available at
http://www-linux.gsi.de/~andronic/fopi/v1.htm
Directed flow in Au+Au, Xe+CsI and Ni+Ni collisions and the nuclear equation of state
We present new experimental data on directed flow in collisions of Au+Au,
Xe+CsI and Ni+Ni at incident energies from 90 to 400A MeV. We study the
centrality and system dependence of integral and differential directed flow for
particles selected according to charge. All the features of the experimental
data are compared with Isospin Quantum Molecular Dynamics (IQMD) model
calculations in an attempt to extract information about the nuclear matter
equation of state (EoS). We show that the combination of rapidity and
transverse momentum analysis of directed flow allow to disentangle various
parametrizations in the model. At 400A MeV, a soft EoS with momentum dependent
interactions is best suited to explain the experimental data in Au+Au and
Xe+CsI, but in case of Ni+Ni the model underpredicts flow for any EoS. At 90A
MeV incident beam energy, none of the IQMD parametrizations studied here is
able to consistently explain the experimental data.Comment: RevTeX, 20 pages, 30 eps figures, accepted for publication in Phys.
Rev. C. Data files available at http://www.gsi.de/~fopiwww/pub
Subclinical atherosclerosis diagnostics as a component of a modern strategy for cardiovascular risk stratification
Cardiovascular risk (CVR) stratification plays an important role in the primary prevention of atherosclerosis and associated disorders. The standard scales for CVR assessment (Framingham scale, SCORE scale, etc.) are focused on a limited number of traditional risk factors (RFs) and, therefore, neither produce precise individual risk estimates, nor increase the effectiveness of preventive interventions. One of the methods for CVR assessment optimisation is the diagnostics of subclinical atherosclerosis, based on the direct visualisation of preclinical atherosclerotic changes in arterial wall. Extracranial carotid artery (CA) ultrasound and assessment of the intima-media thickness (IMT) index or atherosclerotic plaque volume (PV) is an important method of the preclinical atherosclerosis diagnostics. The review discusses pathogenetic mechanisms of IMT increase, the standards of ultrasound IMT assessment and its interpretation, and the role of the information obtained for optimization of the CVR evaluation
Assessing reperfusion efficacy in acute myocardial infarction: modern concepts and methods
A Case of Whipple's Disease Related Infectious Endocarditis
Whipple's disease is caused by Tropheryma whipplei and is known to have protean clinical presentation which could be influenced by patient's immunologic and genetic features. In contemporary literature abundant amount of data could be found on extensive prevalence of infectious endocarditis caused by Tropheryma whipplei. This article presents history of a patient who was observed because of ischemic heart disease, angina pectoris, myocardial infarction, possible ischemic cardiomyopathy and in whom infectious endocarditis complicated by severe aortic regurgitation needing aortic valve replacement surgery was eventually diagnosed. Our patient did not meet Duke criteria, which is a sign of infectious endocarditis caused by Tropheryma whipplei, but a thorough analysis of the disease course, clinical features, heart ultrasound and clinical improvement on specific therapy against Tropheryma whipplei aroused our suspicion, and morphological and bacteriological analysis of the involved (excised) valve, confirmed the diagnosis of Whipple disease. The article presents differential diagnostic criteria of aortic insufficiency and possible causes of coronary insufficiency in the absence of marked coronary atherosclerosis