Real and imaginary-time quarkonium correlators in a hot plasma

The possibility of describing the behavior of a $Q\overline{Q}$ pair in a hot plasma in terms of an effective potential is investigated. It is shown that as long as medium effects can be embodied in a gaussian action, like in the QED case, the $Q\overline{Q}$ propagator obeys a closed temporal evolution equation whose large-time behavior is governed by an effective potential. The latter, beside screening, displays also an imaginary part related to collisions.Comment: Talk given at the 8-th Conference "Quark Confinement and the Hadron Spectrum", Mainz, Germany, 1-6 September 200

An Approximate analytical method to evaluate the performance of multi-product assembly manufacturing systems

The automotive industry is characterized by the continuous and frequent adoption of cutting edge technologies in manufacturing. The introduction of new technology often entails a system level investigation to determine whether it meets expected production requirements. Many system design alternatives are usually considered at this stage, and a fast performance evaluation tool is desired to quickly obtain the optimum system configuration. In this paper, we introduce an analytical tool that was developed for this specific purpose

Pulse of the city: Visualizing Urban Dynamics of Special Events

How does a city perform during a special event? How can we inform local authorities and urban dwellers of public happenings? Until today it has been difficult to monitor urban dynamics in real time. Traditional methods, like head counts, surveys, and aerial inspection, are costly and limited. In this paper we present our twofold approach to the processing and visualization of real time information gathered from the telecommunication infrastructures that percolate modern cities

Acute idiopathic pericarditis with transient constriction [4]

The etiology and the clinical pattern of acute pericarditis change frequently and some classic assumption and descriptions are outdated. We report on a case of transient constrictive pericarditis in a healthy young man

Il calcio coronarico come marker precoce di aterosclerosi

Non-invasive diagnostic techniques such as electron beam computed tomography and multislice spiral computed tomography are able to detect and quantify coronary calcifications. Several clinical studies have shown how the amount of coronary calcifications correlates to the coronary plaque burden. The detection of coronary calcium therefore provides a unique opportunity to identify and quantify coronary atherosclerosis in a subclinical stage. Measures of subclinical atherosclerosis may also help in recognizing factors related to atherosclerosis in asymptomatic populations. In addition, a significant proportion of subjects who develop premature clinical disease are not identified as being at high risk by current strategies. A scan negative for coronary calcium has a high negative predictive value indicating the absence of stenotic coronary artery disease. The aim of this review was to describe the potentials of coronary calcium detection and to summarize its clinical relevance. © 2005 CEPI Srl