5,851 research outputs found
Particle Production at CBM in a Thermal Model Approach
The Compressed Baryonic Matter (CBM) experiment planned at Facility for
Antiproton and Ion Research (FAIR) will provide a major scientific effort for
exploring the properties of strongly interacting matter in the high baryon
density regime. One of the important goal behind such experiment is to
precisely determine the equation of state (EOS) for the strongly interacting
matter at extreme baryon density. In this paper, we have used a thermal model
EOS incorporating excluded volume description for the hot and dense hadron gas
(HG). We then predict different particle ratios and the total multiplicity of
various hadrons in the CBM energy range i.e. from A GeV to A GeV lab
energies, which corresponds to A GeV and A GeV center-of-mass
energies. Our main emphasis is to estimate the strange particles enhancement as
well as increase in the net baryon density in CBM experiment. We have also
compared our results with the results obtained from various other theoretical
approaches existing in the literature such as hadron string dynamics (HSD)
model and ultra-relativistic quantum molecular dynamics (UrQMD) etc.Comment: 16 pages, 8 figure
Thermal effects on nuclear symmetry energy with a momentum-dependent effective interaction
The knowledge of the nuclear symmetry energy of hot neutron-rich matter is
important for understanding the dynamical evolution of massive stars and the
supernova explosion mechanisms. In particular, the electron capture rate on
nuclei and/or free protons in presupernova explosions is especially sensitive
to the symmetry energy at finite temperature. In view of the above, in the
present work we calculate the symmetry energy as a function of the temperature
for various values of the baryon density, by applying a momentum-dependent
effective interaction. In addition to a previous work, the thermal effects are
studied separately both in the kinetic part and the interaction part of the
symmetry energy. We focus also on the calculations of the mean field potential,
employed extensively in heavy ion reaction research, both for nuclear and pure
neutron matter. The proton fraction and the electron chemical potential, which
are crucial quantities for representing the thermal evolution of supernova and
neutron stars, are calculated for various values of the temperature. Finally,
we construct a temperature dependent equation of state of -stable
nuclear matter, the basic ingredient for the evaluation of the neutron star
properties.Comment: 18 pages, 10 figures, 1 table, accepted for publication in Physical
Review
Proton-nucleus total reaction cross sections in the optical limit Glauber theory: Subtle dependence on the equation of state of nuclear matter
We calculate the proton-nucleus total reaction cross sections at different
energies of incident protons within the optical limit approximation of the
Glauber theory. The isospin effect has been taken into account. The nucleon
distribution is obtained in the framework of macroscopic nuclear models in a
way depending on the equation of state of uniform nuclear matter near the
saturation density. We find that at an energy of order 40 MeV, the reaction
cross section calculated for neutron- rich isotopes significantly increases as
the parameter L characterizing the density dependence of the symmetry energy
increases, while at energies of order 300 and 800 MeV, it is almost independent
of L. This is a feature of the optical limit Glauber theory in which an
exponential dependence of the reaction cross section on the neutron skin
thickness remains when the total proton-neutron cross section is small enough.Comment: 5 pages, 4 figure
Method for Generating Long-Range Correlations for Large Systems
We propose a new method to generate a sequence of random numbers with
long-range power-law correlations that overcomes known difficulties associated
with large systems. The new method presents an improvement on the commonly-used
methods. We apply the algorithm to generate enhanced diffusion, isotropic and
anisotropic self-affine surfaces, and isotropic and anisotropic correlated
percolation.Comment: 4 pages, REVTEX, figures available upon request from
[email protected]
Influence of fatigue on superconducting REBCO tapes under repeated cyclic tensile, bending and twisting loads:A simulation-based investigation
The effect of repeated cyclic loading on the superconducting REBCO tape under tensile, bending, and torsional loadings is investigated. The Fatigue Usage Factor (FUS) is calculated for each cyclic loading condition to identify degradation using the Matake criterion. The thicknesses of the tapes' constituent layers are also varied to identify the relative influence of each layer on overall fatigue performance. When the tape was subjected to fatigue-type loading, the thickness of the copper and Hastelloy layers was found to play a significant role. This holds true under tensile, bending, and twisting loading conditions. However, out of the three loading conditions, bending exhibits the greatest variation in FUS value with changes in Hastelloy and copper layer thickness. The maximum value of the fatigue usage factor is observed in the edges of the Hastelloy layer in all three loading cases. It has been found that the properties of the layer material, as well as the adjacent layer, play an important role in determining the fatigue strength of the tape.</p
Bacillus cereus KLUVAA Mediated Biocement Production Using Hard Water and Urea
In the present study, a potential bacterial strain with maximum urease activity was isolated from urea-rich paddy field soil for biocement production. The bacterial isolate was screened using Christensen selective agar media and named as KLUVAA. This isolate was found to be tolerant up to 10 % urea. 16S rRNA sequencing analysis identified
the isolate KLUVAA as Bacillus cereus. Biocement production was carried out using tap water with 431.7 mg L–1 of hardness as a natural source of calcium. Functional groups present in biocement were analysed using FT-IR spectrum. The morphology and elemental composition of the biocement was studied using SEM with EDS mapping and XRD analyses. Thermogravimetric analysis was used to study the thermal stability of the microbial biocement. Further, process parameters were optimized for enhancing the yield of biocement.
This work is licensed under a Creative Commons Attribution 4.0 International License
Ensuring the Data Integrity and Confidentiality in Cloud Storage Using Hash Function and TPA
Main call for Cloud computing is that users only utilize what they required and only pay for whatever they are using. Mobile Cloud Computing refers to an infrastructure where data processing and storage can happen away from mobile device. Research estimates that mobile subscribers worldwide will reach 15 billion by the end of 2014 and 18 billion by at the ending of 2016. Due to increasing use of mobile devices the requirement of cloud computing in mobile devices arise, which evolves Mobile Cloud Computing. Mobile devices require large storage capacity and maximum CPU speed. As we are storing data on cloud there is an issue of data security. As there is risk associated with data storage many IT professionals are not showing their interest towards Mobile Cloud Computing. To ensure the users' data correctness in the cloud, here we are proposing an effective mechanism with salient feature of data integrity and confidentiality. This paper proposed a solution which uses the RSA algorithm and mechanism of hash function along with various cryptography tools to provide better security to the data stored on the cloud. This model can not only solve the problem of storage of massive data, but also make sure that it will give data access control mechanisms and ensure sharing data files with confidentiality and integrity.
DOI: 10.17762/ijritcc2321-8169.15055
Land deformation due to underground coal mining – A case study
Ground movement, a foregone conclusion of underground mining. Will show up in the form of land deformation at the surface. Subsidence studies were conducted by mind tank, Central Institute of Mining and Fuel (Dhanbad), over and around the bord and pillar panel of Jharia Coalfield, Jharkhand to probe into the impacts on land environment. The extraction area has been correlated with the size of the planar and surface subsidence area. The affected area was larger than the extraction area. The change in surface topography will also affect the surface drainage pattern as dealt in this paper
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