54 research outputs found
Coulomb interaction on pion production in Au+Au collisions at relativistic energies
Coulomb effects on charged pion transverse momentum spectra produced in Au+Au
collisions at RHIC-BES energies are investigated. From these spectra the
{\pi}-/{\pi}+ ratios as a function of transverse momentum are obtained and used
to extract the Coulomb kick (a momentum change due to Coulomb interaction) and
initial pion ratio for three different collision energies and various
centrality classes. The Coulomb kick shows a decrease with the increase of beam
energy and a clear centrality dependence, with larger values for the most
central collisions. The results are connected with the kinetic freeze-out
dynamics and discussed
A mobile detector for measurements of the atmospheric muon flux in underground sites
Muons comprise an important contribution of the natural radiation dose in air
(approx. 30 nSv/h of a total dose rate of 65-130 nSv/h), as well as in
underground sites even when the flux and relative contribution are
significantly reduced. The flux of the muons observed in underground can be
used as an estimator for the depth in mwe (meter water equivalent) of the
underground site. The water equivalent depth is an important information to
devise physics experiments feasible for a specific site. A mobile detector for
performing measurements of the muon's flux was developed in IFIN-HH, Bucharest.
Consisting of 2 scintillator plates (approx. 0.9 m2) which measure in
coincidence, the detector is installed on a van which facilitates measurements
at different locations at surface or underground. The detector was used to
determine muon fluxes at different sites in Romania. In particular, data were
taken and the values of meter water equivalents were assessed for several
locations from the salt mine from Slanic Prahova, Romania. The measurements
have been performed in 2 different galleries of the Slanic mine at different
depths. In order to test the stability of the method, also measure- ments of
the muon flux at surface at different elevations were performed. The results
were compared with predictions of Monte-Carlo simulations using the CORSIKA and
MUSIC codes
Interactive whiteboards in Romania
AbstractThe utilization of the interactive whiteboard is a challenge for Romanian teachers. The education methods involving this device can vary because they depend on the components involved in this process: the teacher, the students, the computer, as basic tool, and software, including applications developed for education in different programming languages. The results of a preliminary study involving 54 Romanian teachers about the experience referring to this subject are presented
Coulomb Interaction Effects on Pion Production in Au+Au Collisions at Relativistic Energies
Coulomb effects on charged pion transverse momentum spectra measured in Au+Au collisions at RHIC-BES energies are investigated. From these spectra the Ļ-/Ļ+ ratios as a function of transverse momentum are obtained and used to extract the āCoulomb kickā, pc (a momentum change due to the Coulomb interaction), and initial pion ratio for three different collision energies and various centrality classes. The Coulomb kick shows a decrease with the increase of beam energy and a clear centrality dependence, with larger values for the most central collisions. The results are connected with the kinetic freeze-out dynamics
Rapidity dependence of charged pion production at relativistic energies using Tsallis statistics
Transverse momentum distributions of charged pions produced in Au+Au collisions at 62.4GeV, 130GeV, 200GeV, Cu+Cu and d+Au collisions at 200GeV, p+p collisions at 62.4 and 200GeV and Pb+Pb collisions at 17.3GeV are studied using the Tsallis distribution as a parametrization. The non-extensivity parameter and Tsallis volume increase with energy, while the Tsallis temperature shows a decrease at higher energies. Using BRAHMS spectra obtained in Au+Au collisions at 62.4GeV and 200GeV, Tsallis fit parameters are obtained on a very wide rapidity range. Results are compared with p+p and Cu+Cu data and changes of Tsallis parameters with rapidity and energy are investigated. We found that non-extensivity parameter q shows a decrease from midrapidity to forward rapidities for all the studied systems. Tsallis volume, V , increases with the system size from p+p, Cu+Cu to Au+Au, both in central rapidity region and at forward rapidities. The values of temperatures increase with rapidity, but the ratio is constant as a function of rapidity
The benefits of using MOODLE in teacher training in Romania
AbstractThe utilization of the e-learning environments for teacher training programs is at the beginning in the Romanian system for teacher continuous formation. Also, the rules for approving this kind of formation program are not approved yet, due the ongoing modification to The Law of Romanian Education. There are a lot of e-learning environments in our academic institutions, but now the free resource Moodle for e-learning course management system gain new users every day. Some of the benefits which recommend Moodle for being implemented in the Romanian's programs for teacher training are the subject of our paper: different types of assignments, chats, forums, databases, glossaries, lessons, multiple types of tests with one or more items, quizzes, wikis, surveys and the SCORM/AICC module
Healthcare-associated Clostridioides difficile infection during the COVID-19 pandemic in a tertiary care hospital in Romania
Introduction. Information on healthcare-associated C.difficile infection (HA-CDI) in COVID-19 patients is limited. We aimed to assess the characteristics of HA-CDI acquired during and before the COVID-19 pandemic
THE URBAN BATTLEGROUND. SECURING OPEN CITIES FROM RANDOM VIOLENCE
Abstract:
European cities are facing an environment dominated by the presence of
threats and their unexpected transformation into episodes of violence.
Generating security and maintaining a level of trust in state institutions has
become a more challenging task. Security has grown more focused in
securing the domestic scene. Public safety is paramount for individuals and
when public safety is contested, individuals usually respond with fear and
mistrust.
Securing the city means securing a way of life as the city is the main
embodiment of modernity, the primary source of progress and the home of
most people in Western societies. Big cities like Paris, London or New York
require the permanent vigilance of a large security apparatus, focused on
prevention and the reduction of risks.
When citizens are forcibly turned into victims or powerless by-standers a
process of reflection emerges. How can security be enhanced to avoid the
modification of the lifestyle and to avoid curbing down appreciated freedoms
in the West
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