1,043 research outputs found
Customer Service--A Need for Survival
Customers are the ones who make or break a firm. It has become of utmost importance for todayâs organizations to understand the true value of customers.Customer Service
Spectral Red-Shift Versus Broadening from Photon and Dilepton Spectra
We estimate the photon and dilepton emission rates from hot hadronic matter
with in-medium spectral shift and broadening of vector mesons. It is observed
that both the WA98 photon data and CERES/NA45 dilepton data can be well
reproduced with similar initial conditions. The freeze-out condition has been
constrained by the transverse mass spectra of pions and protons measured by the
NA49 collaboration. We argue that simultaneous measurement of the spectra
of single photons as well as invariant mass distribution of dileptons is
crucial to understand the in-medium spectral function of the vector mesons.Comment: Title and contents change
Thermal Photons and Lepton Pairs from Quark Gluon Plasma and Hot Hadronic Matter
The formulation of the real and virtual photon production rate from strongly
interacting matter is presented in the framework of finite temperature field
theory. The changes in the hadronic spectral function induced by temperature
are discussed within the ambit of the Walecka type model, gauged linear and
non-linear sigma models, hidden local symmetry approach and QCD sum rule
approach. Possibility of observing the direct thermal photon and lepton pair
from quark gluon plasma has been contrasted with those from hot hadronic matter
with and without medium effects for various mass variation scenarios. At SPS
energies, in-medium effects of different magnitude on the hadronic properties
for the Walecka model, Brown-Rho scaling and Nambu scaling scenarios are
conspicuously visible through the low invariant mass distribution of dilepton
and transverse momentum spectra of photon. However, at RHIC energies the
thermal photon (dilepton) spectra originating from Quark Gluon Plasma
overshines those from hadronic matter for large transverse momentum (invariant
mass) irrespective of the models used for evaluating the finite temperature
effects on the hadronic properties. It is thus expected that both at RHIC and
LHC energies the formation of Quark Gluon Plasma in the initial stages may
indeed turn out to be a realistic scenario.Comment: Text revised, 3 figures adde
Choice of Decorative Paints: Recommendation of Interior Designer and Dealers, an Opinion Survey of Berger Paints Limited, Kolkata
Present study is an opinion survey of the Dealers of Berger Paints Pvt. Ltd., India and Interior designer of Kolkata, India that reveals the factors affecting the choice of paints of the said respondents of Kolkata. The objective of the study was to understand the factors affecting the recommendation of domestic paints with respect to the dealer and interior designer of BERGER Paints Ltd., Kolkata (India). The result denotes some important auxiliary and ancillary factors having an impact on the choice process of the respondents
Epidemiological study of dilated cardiomyopathy from eastern India with special reference to left atrial size
Dilated cardiomyopathy (DCM) is a common cause of emergency visit in our country. The disease is often misdiagnosed and mistreated. There are very few studies on DCM from India. We undertook a small study on DCM patients from Eastern India to find the demographic and echocardiographic characteristics. Patients and methods: We under took this study in a tertiary care Medical College of Eastern India. All patients coming to the emergency with dyspnea were evaluated for cardiac dysfunction. Emergency echocardiography was done to diagnose dilated cardiomyopathy. Patients with DCM were then evaluated as per protocol. After stabilization, echocardiography was repeated to note the study parameters like left atrial diameter. Standard statistical tests were used. Results: we had a total of 70 patients in our study with a male: female ratio of 43:27. Most patients were aged over 40 years. Patients with COPD, history of radiation, malignancy or drug abuse were excluded. Most patients (47%) were on NYHA stage 3 at the time of presentation. In our patient cohort, 24% were alcoholic and 46% were smokers. Atrial fibrillation was present in 15.7% of the patients and right and left bundle branch block had been present in 8 and 15 patients respectively. In echocardiography, increased left atrial (LA) size (>40 mm) was found in 45 patients. Many patients had valvular regurgitation, mitral, aortic or tricuspid. LA size was positively correlated with left ventricular systolic diameter (r=0.403) and negatively correlated with ejection fraction (r= -0.23). Analysis and conclusion: different ECG abnormalities like bundle branch block and arrhythmias like atrial fibrillation are quite common in DCM. In echocardiography, left atrial size is an important prognostic marker and correlates with left ventricular function
Photons from Nucleus-Nucleus Collisions at Ultra-Relativistic Energies
We compare the photon emission rates from hot hadronic matter with in-medium
mass shift and Quark Gluon Plasma (QGP). It is observed that the WA98 data can
be well reproduced by hadronic initial state with initial temperature MeV if the universal scaling of temperature dependent hadronic masses are
assumed and the evolution of temperature with time is taken from transport
model or (3+1) dimensional hydrodynamics. The data can also be reproduced by
QGP initial state with similar initial temperature and non-zero initial radial
velocity.Comment: Talk given in the International Nuclear Physics Conference, at the
University of California, Berkeley, USA, during July 30 - August 3, 200
Photons from Pb + Pb and S + Au Collisions at CERN SPS Energies
The effects of the variation of vector meson masses and decay widths on photon production from hot strongly interacting matter formed after Pb + Pb and S + Au collisions at CERN SPS energies are considered. It has been shown that the present photon spectra measured by WA80 and WA98 Collaborations can not distinguish between the formation of quark matter and hadronic matter in the initial state.The effects of the variation of vector meson masses and decay widths on photon production from hot strongly interacting matter formed after Pb + Pb and S + Au collisions at CERN SPS energies are considered. It has been shown that the present photon spectra measured by WA80 and WA98 Collaborations can not distinguish between the formation of quark matter and hadronic matter in the initial state
Cosmological QCD Phase Transition and Dark Matter
We calculate the size distribution of quark nuggets, which could be formed
due to first order QCD phase transition in the early universe. We find that
there are a large number of stable Quark Nuggets which could be a viable
candidate for cosmological dark matter.Comment: To appear in Quark Matter 99 proceeding
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