586 research outputs found
Quark-Gluon Plasma: Present and Future
We review a sample of the experimental results from AGS to SPS and RHIC and
their interpretations towards understanding of the Quark-Gluon Plasma. We
discuss extrapolations of these results to the upcoming LHC experiments.
Finally, we present the plans to probe the QCD critical point with an energy
scan at RHIC and FAIR facilities.Comment: Invited talk at the DAE Symposium on Nuclear Physics (December 2007)
at Sambalpur University, India. 9 page
Event-by-event fluctuations and the QGP phase transition
Fluctuations of thermodynamic quantities are fundamental to the study of QGP phase transition. Event-by-event fluctuations of many quantities have been studied by dedicated heavy-ion experiments. A brief review of recent experimental results is presented. The prospect for future study of fluctuations is discussed
Probing the QCD phase structure using event-by-event fluctuations
Heavy-ion collisions at relativistic energies probe matter at extreme
conditions of temperatures and energy densities. The study of event-by-event
fluctuations of experimental observables is crucial to probe the QCD phase
transition, locate the critical point, and learn about the associated critical
phenomena. At the critical point, all thermodynamic quantities behave
anomalously. Fluctuation measurements provide access to thermodynamic response
functions. We discuss the methods for obtaining the isothermal compressibility
using particle multiplicity fluctuation, and specific heat using fluctuations
in mean transverse momentum, temperature, and energy. Lattice QCD calculations
have predicted non-monotonic behavior in the higher-order cumulants of
conserved quantities at the critical point. Fluctuations in the multiplicity of
charged to neutral particles have been measured to understand the formation of
domains of disoriented chiral condensates. We review the recent fluctuation
results as a function of collision centrality and energy from experiments at
SPS, RHIC, and LHC. In addition, we propose to map the temperature fluctuations
in eta-phi plane to probe local fluctuations of temperature and energy density.Comment: To appear in the proceedings of WWND 2020 conference, 12 pages, 14
figure
Reverse Engineering: Methodologies for Web Applications
The Reverse Engineering of Web Applications is a complex problem, due to the variety of languages and technologies that are contemporary used to realize them. Indeed, the benefits that can be obtained are remarkable: the presence of documentation at different abstraction levels will help the execution of maintenance interventions, migration and reengineering processes, reducing their costs and risks and improving their effectiveness. Moreover, the assessment of the maintainability factor of a Web Application is an important support to decision making processes. Business processes are often implemented by mean of software systems which expose them to the user as an externally accessible Web application. This paper describes a methodologies for recovering business processes by dynamic analysis of the Web applications which ex-pose them
Study of dynamical charge fluctuations in the hadronic medium
The dynamical charge fluctuations have been studied in ultra-relativistic
heavy-ion collisions by using hadronic model simulations, such as UrQMD and
HIJING. The evolution of fluctuations has been calculated at different time
steps during the collision as well as different observation window in
pseudorapidity (\DelEta). The final state effects on the fluctuations have been
investigated by varying ~ and the time steps with the aim
of obtaining an optimum observation window for capturing maximum fluctuations.
It is found that ~ between 2.0 and 3.5 gives the best
coverage for the fluctuations studies. The results of these model calculations
for Au+Au collisions at ~=~7.7 to 200~GeV and for Pb+Pb
collisions at 2.76 TeV are presented and compared with available experimental
data from the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron
Collider (LHC).Comment: 6 pages, 4 Figure
Optimization of multi-gigabit transceivers for high speed data communication links in HEP Experiments
The scheme of the data acquisition (DAQ) architecture in High Energy Physics
(HEP) experiments consist of data transport from the front-end electronics
(FEE) of the online detectors to the readout units (RU), which perform online
processing of the data, and then to the data storage for offline analysis. With
major upgrades of the Large Hadron Collider (LHC) experiments at CERN, the data
transmission rates in the DAQ systems are expected to reach a few TB/sec within
the next few years. These high rates are normally associated with the increase
in the high-frequency losses, which lead to distortion in the detected signal
and degradation of signal integrity. To address this, we have developed an
optimization technique of the multi-gigabit transceiver (MGT) and implemented
it on the state-of-the-art 20nm Arria-10 FPGA manufactured by Intel Inc. The
setup has been validated for three available high-speed data transmission
protocols, namely, GBT, TTC-PON and 10 Gbps Ethernet. The improvement in the
signal integrity is gauged by two metrics, the Bit Error Rate (BER) and the Eye
Diagram. It is observed that the technique improves the signal integrity and
reduces BER. The test results and the improvements in the metrics of signal
integrity for different link speeds are presented and discussed
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