Results 21 to 30 of about 85 (76)
Thermodynamics of perfect fluids from scalar field theory [PDF]
Physical Review D, 2016 The low-energy dynamics of relativistic continuous media is given by a shift-symmetric effective theory of four scalar fields. These scalars describe the embedding in spacetime of the medium and play the role of Stückelberg fields for spontaneously broken spatial and time translations.
Ballesteros, G. +2 more
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Zhileng xuebaoIn the operational diagnosis of air-source heat pumps, the conventional coefficient of performance faces limitations in distinguishing environmental effects from equipment performance degradation due to its dependency on operating conditions.
Yang Qiang +7 more
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Thermodynamical instabilities of perfect fluid spheres in General Relativity [PDF]
Classical and Quantum Gravity, 2013 For a static, perfect fluid sphere with a general equation of state, we obtain the relativistic equation of hydrostatic equilibrium, namely the Tolman-Oppenheimer-Volkov equation, as the thermodynamical equilibrium in the microcanonical, as well as the canonical, ensemble.
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Structure of curved crystals in the thermodynamic limit and the perfect screening condition
Physical Review E, 2016 The dislocation and disclination density defining the structure of a crystal constrained on a general curved background is computed analytically in the thermodynamic limit, when the number of particles is arbitrarily large. It is shown that the minimum of the elastic energy, where strains are optimally close to zero, can be formulated in terms of a ...
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Probing Dark Energy through Perfect Fluid Thermodynamics
, 2019 We demonstrate that the thermodynamics of a perfect fluid describing baryonic matter can, in certain limits, lead to an equation of state similar to that of dark energy. We keep the cosmic fluid equation of state quite general by just demanding that the speed of sound is positive and less than the speed of light.
Lukes-Gerakopoulos, Georgios +2 more
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Thermodynamic properties of “near-perfect” gas
Physics of PlasmasWhen applied thermodynamics requires simple representations of thermodynamic quantities, one often finds quantities such as pressure and the thermal energy density expressed as a monomial linear product of density and temperature power laws. This is a simple generalization of the product of density and temperature used for the perfect gas that admits a
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Comment to the reply to "On the thermodynamics of inhomogeneous perfect fluid mixtures"
, 2004 2 ...
Coll, Bartolomé, Ferrando, Joan Josep
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The status and development trend of the water chiller energy efficiency standard in China
The study we present here analyzes the status of the water chiller energy efficiency standard in China. The national standard, GB19577-2004, which sets the grade and scale of water chiller energy efficiency, has been implemented for five years and has ...
Minxia, Li +4 more
core
Assessment of thermodynamic perfection of working substancesin cascade refrigerators
Eastern-European Journal of Enterprise Technologies, 2015 Каскадные холодильные машины представляют последовательно совмещенные одноступенчатые циклы-каскады с разными рабочими веществами и массовыми расходами. Приведен способ выбора пары рабочих веществ для машины с учетом температурного режима работы. На примере веществ R744, R717, R290 при различных сочетаниях в каскадах установлено взаимное влияние ...
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