The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform
Bin Wang - One of the best experts on this subject based on the ideXlab platform.
-
Thermodynamics of 2 1 dimensional coulomb like black holes from nonlinear electrodynamics with a traceless energy momentum tensor
Physical Review D, 2021Co-Authors: Mauricio Cataldo, P A Gonzalez, Joel Saavedra, Yerko Vasquez, Bin WangAbstract:In this work we study the Thermodynamics of a ($2+1$)-dimensional static black hole under a nonlinear electric field. In addition to standard approaches, we investigate black hole Thermodynamic geometry. We compute Weinhold and Ruppeiner metrics and compare the Thermodynamic geometries with the standard description for black hole Thermodynamics. We further consider the cosmological constant as an additional extensive Thermodynamic Variable. For Thermodynamic equilibrium in three-dimensional space, we compute heat engine efficiency and show that it may be constructed with this black hole.
Punyabrata Pradhan - One of the best experts on this subject based on the ideXlab platform.
-
zeroth law and nonequilibrium Thermodynamics for steady states in contact
Physical Review E, 2015Co-Authors: Sayani Chatterjee, Punyabrata Pradhan, P K MohantyAbstract:We ask what happens when two nonequilibrium systems in steady state are kept in contact and allowed to exchange a quantity, say mass, which is conserved in the combined system. Will the systems eventually evolve to a new stationary state where a certain intensive Thermodynamic Variable, like equilibrium chemical potential, equalizes following the zeroth law of Thermodynamics and, if so, under what conditions is it possible? We argue that an equilibriumlike Thermodynamic structure can be extended to nonequilibrium steady states having short-ranged spatial correlations, provided that the systems interact weakly to exchange mass with rates satisfying a balance condition-reminiscent of a detailed balance condition in equilibrium. The short-ranged correlations would lead to subsystem factorization on a coarse-grained level and the balance condition ensures both equalization of an intensive Thermodynamic Variable as well as ensemble equivalence, which are crucial for construction of a well-defined nonequilibrium Thermodynamics. This proposition is proved and demonstrated in various conserved-mass transport processes having nonzero spatial correlations.
-
nonequilibrium steady states in contact approximate Thermodynamic structure and zeroth law for driven lattice gases
Physical Review Letters, 2010Co-Authors: Punyabrata Pradhan, Christian Amann, Udo SeifertAbstract:: We explore driven lattice gases for the existence of an intensive Thermodynamic Variable which could determine "equilibration" between two nonequilibrium steady-state systems kept in weak contact. In simulations, we find that these systems satisfy surprisingly simple Thermodynamic laws, such as the zeroth law and the fluctuation-response relation between the particle-number fluctuation and the corresponding susceptibility remarkably well. However, at higher densities, small but observable deviations from these laws occur due to nontrivial contact dynamics and the presence of long-range spatial correlations.
P K Mohanty - One of the best experts on this subject based on the ideXlab platform.
-
zeroth law and nonequilibrium Thermodynamics for steady states in contact
Physical Review E, 2015Co-Authors: Sayani Chatterjee, Punyabrata Pradhan, P K MohantyAbstract:We ask what happens when two nonequilibrium systems in steady state are kept in contact and allowed to exchange a quantity, say mass, which is conserved in the combined system. Will the systems eventually evolve to a new stationary state where a certain intensive Thermodynamic Variable, like equilibrium chemical potential, equalizes following the zeroth law of Thermodynamics and, if so, under what conditions is it possible? We argue that an equilibriumlike Thermodynamic structure can be extended to nonequilibrium steady states having short-ranged spatial correlations, provided that the systems interact weakly to exchange mass with rates satisfying a balance condition-reminiscent of a detailed balance condition in equilibrium. The short-ranged correlations would lead to subsystem factorization on a coarse-grained level and the balance condition ensures both equalization of an intensive Thermodynamic Variable as well as ensemble equivalence, which are crucial for construction of a well-defined nonequilibrium Thermodynamics. This proposition is proved and demonstrated in various conserved-mass transport processes having nonzero spatial correlations.
J C Tutor - One of the best experts on this subject based on the ideXlab platform.
-
Thermodynamic Determination of Plasma and Leukocyte beta-Hexosaminidase Isoenzymes in Homozygote and Heterozygote Carriers for the GM2 Gangliosidosis B1 Variant
American journal of clinical pathology, 2003Co-Authors: J Antonio Casal, L F Pérez, J C TutorAbstract:In the GM2 gangliosidosis B1 variant, the mutated isoenzyme A of beta-hexosaminidase (Hex) is incapable of hydrolyzing ganglioside GM2 and negatively charged substrates. Biochemical characterization of this lysosomal disease is carried out using synthetic alpha-subunit-specific sulfated substrates, as heat-inactivation assays are not applicable. The apparent enzyme activation energy of Hex using the chromogenic substrate 3,3'-dichlorophenolsulfonphthaleinyl N-acetyl-beta-D-glucosaminide is related directly to the relative proportions of Hex A and Hex B isoenzymes. This Thermodynamic Variable was used for the study of Hex enzyme heterogeneity in 3 patients with the GM2 gangliosidosis B1 variant and 6 heterozygote carriers. Hex activity was determined at 25 degrees C, 30 degrees C, 35 degrees C, and 37 degrees C in a Cobas Bio analyzer (Roche Diagnostics, Basel, Switzerland), and Arrhenius plot slopes and apparent activation energies were calculated in plasma samples and mononuclear and polymorphonuclear leukocyte lysates. The determination of the Hex isoenzymes in plasma presented a high discrimination power for B1 variant patients but not for heterozygote carriers, in whom false-negative results may be obtained. However, Thermodynamic evaluation of the isoenzyme composition of Hex in leukocyte lysates permits the biochemical identification of patients with the GM2 gangliosidosis B1 variant and of heterozygote carriers.
-
Effect of partial proteolysis on the activation energy of β-N-acetylhexosaminidase precursor and mature forms
Clinical Chemistry and Laboratory Medicine, 2003Co-Authors: Jesús Hermida, J Antonio Casal, J C TutorAbstract:Using 3,3'-diclorophenolsulfoftaleinil N-acetyl-beta-D-glucosaminide as a substrate, the apparent activation energy of beta-N-acetylhexosaminidase (Hex) was determined in samples of plasma and urine, as well as in leukocyte and platelet lysates. Incubation with papain produced an increase in this Thermodynamic Variable for plasma Hex (precursor forms with high molecular mass) that would be caused by the proteolytic action of papain on the Hex A isoenzyme. However, digestion with papain did not significantly modify the activation energy of Hex in leukocyte and platelet lysates (mature enzymatic forms). In 11 healthy subjects and 28 patients with different renal diseases, no statistically significant differences were found with regard to the values obtained in cellular lysates for variations in the activation energy of urinary Hex, regardless of whether they presented normoalbuminuria, microalbuminuria or macroalbuminuria. These results support the hypothesis that even in patients with proteinuria, no significant amounts of plasma Hex precursor forms are found in urine samples, and the source of the enzyme activity is the kidney itself.
-
Thermodynamic characterisation of the mutated isoenzyme A of beta-N-acetylhexosaminidase in GM2-gangliosidosis B1 variant.
Clinica Chimica Acta, 1999Co-Authors: L F Pérez, H M Ribeiro, J A Casal, R A Pinto, M C Sá Miranda, J C TutorAbstract:Here we report the determination of the activation energies of the plasma isoenzymes of beta-N-acetylhexosaminidase (Hex, EC 3.2.1.52), isolated by chromatography in DEAE-cellulose, using the neutral chromogenic substrate 3,3'dichlorophenylsulfonphthaleinyl-N-acetyl-beta-D-glucosaminide. The activation energy of mutated Hex A isoenzyme (Ea approximately 71.5 kJ/mol) from a patient with GM2-gangliosidosis B1 variant, homozygote for the G533-->A (Arg178His) mutation, was significantly higher than that of normal Hex A (Ea approximately 41.8 kJ/mol) and analogous to that of Hex B isoenzyme (Ea approximately 75.1 kJ/mol). The determination of this Thermodynamic Variable of Hex in different biological specimens could allow for a straightforward biochemical characterisation of the GM2-gangliosidosis B1 variant.
Vanderlei Salvador Bagnato - One of the best experts on this subject based on the ideXlab platform.
-
Thermal Global Expansion Coefficient Measurement for a Harmonic Trapped Gas Across Bose-Einstein Condensation
Brazilian Journal of Physics, 2018Co-Authors: E. D. Mercado-gutierrez, F. J. Poveda-cuevas, Vanderlei Salvador BagnatoAbstract:We report the measurement of the global thermal expansion coefficient of a confined Bose gas of ^87Rb in a harmonic potential around the Bose-Einstein condensation transition temperature. We use the concept of global Thermodynamic Variable, previously introduced and appropriated for a non-homogeneous system. We observe the behavior of the thermal expansion coefficient above and below the critical temperature showing the lambda-like shape present in superfluid helium. The study demonstrates the potentiality of global Thermodynamic Variables for the investigation of properties across the critical temperature, and a new way to study the Thermodynamic properties of the quantum systems.
-
scaling properties for a harmonic trapped gas near bose einstein condensation using thermal global expansion coefficient measurement
arXiv: Quantum Gases, 2016Co-Authors: E D Mercadogutierrez, F J Povedacuevas, Vanderlei Salvador BagnatoAbstract:We report the measurement of the global thermal expansion coefficient of a confined Bose gas of $^{87}\rm Rb$ in a harmonic potential around the Bose-Einstein condensation transition temperature. We use the concept of global Thermodynamic Variable, previously introduced and appropriated for a non homogeneous system. The data show divergence on the thermal expansion coefficient near the transition temperature and analyses of the universality behavior shows a critical exponent $\alpha = 0.15\pm 0.09$. With this obtained value and the critical exponent for the correlation length recently presented in the literature we analyse the scaling law combining dimension and critical exponents.
-
Thermodynamics of an ideal gas of bosons harmonically trapped equation of state and susceptibilities
Brazilian Journal of Physics, 2005Co-Authors: Victor Romerorochin, Vanderlei Salvador BagnatoAbstract:We present theoretical aspects concerning the Thermodynamics of an ideal bosonic gas trapped by a harmonic potential. Working in the Grand Canonical ensemble we are able to properly identify the extensive Thermodynamic Variable equivalent to the volume and the intensive Thermodynamic Variable equivalent to the pressure. These are called the "harmonic volume" and the "harmonic pressure" and their physical meaning is discussed. With these Variables, the problem of Bose-Einstein condensation is studied in terms of the behavior of the corresponding equation of state and in terms of measurable susceptibilities such as the heat capacities, the isothermal compressibility and the coefficient of thermal expansion. From the analysis, an interesting analogy with Black-Body radiation emerges, showing that at and below the critical temperature, the non-condensate fraction of atoms behaves Thermodynamically like a gas of massless particles.
-
Thermodynamic Analogies Between Bose-Einstein Condensation and Black-Body Radiation
Developments in Mathematical and Experimental Physics, 2003Co-Authors: Víctor Romero-rochín, Vanderlei Salvador BagnatoAbstract:We discuss the Thermodynamic properties of a bosonic gas trapped in a harmonic potential. We identify properly the extensive Thermodynamic Variable equivalent to the volume and the intensive Thermodynamic Variable equivalent to the pressure. With these Variables one is able to deduce all the Thermodynamics of the system. From this point of view, an interesting analogy with Black-Body radiation emerges, showing that at and below the critical temperature, the non-condensate fraction of atoms behaves Thermodynamically like a gas of massless particles.
