A thermodynamic approach is presented to classify geothermal reservoir as vapor or liquid dominated. According to it, the vapor dominated reservoir has specific volume of fluid (i.e. combined vapor and liquid) greater than the critical volume of water whereas the liquid dominated reservoir has lesser specific volume. Enthalpy is not a conservative entity in a geothermal system. Apart from it, t...

A B S X R A C T Unpoisoned sartorius muscles of Rana temporaria were stimulated tetanically in isometric contractions lasting up to 20 s at 0~ The observed enthalpy (heat + work) production and the chemical changes in these contractions were measured, and a comparison was made between the observed enthalpy and the enthalpy that could be explained by the chemical changes. Like earlier workers, w...

It is shown that accurate values of the rates of enthalpy generation in the electrolysis of light and heavy water can be obtained from measurements in simple, single compartment Dewar type calorimeter cells. This precise evaluation of the rate of enthalpy generation relies on the nonlinear regression fitting of the “black-box” model of the calorimeter to an extensive set of temperature time mea...

Rapidly quenched glass formers are amorphous and transformed into phases by relaxing enthalpy during the first heating. Two liquids give rise, at first, to an intermediate Phase 3 below T3 < Tg respecting entropy constraints then, increases towards that of phase up Tg. The negative activation energy shows is hidden behind glassy acting as invasive second cooling. carries a medium-range order ab...

Abstract The purpose of this study is to critically analyze different methods calculation activation energy relaxation in sucrose-water system from differential scanning calorimetry data. We consider the use thermal cycles for calculations together with Moynihan and Kissinger equations. effect two glass transition temperature determination (half-step inflection point) on values. Along experimen...

The ultrasonic velocity (U), density (ρ), viscosity (η) have been measured for Cholesteryl oleyl carbonate at different temperatures. From the experimental data, , Free Volume (VF)), Internal Pressure (πi), Relaxation time (τ), Gibbs Free Energy (ΔG), Absorption Coefficient () and Enthalpy (H), Entropy(S) have been calculated.Entropy is a thermodynamic state property, its value depends only on...

N-Isopropylpropionamide (NiPPA), which can self-associate via hydrogen bonds, was found to undergo a solid-solid transition as identified by DSC and X-ray diffraction. Below the melting temperature of 51 °C NIPPA adopts a plastic crystalline state with a tetragonal unit cell until it transforms into an ordered crystal with a monoclinic structure at temperatures ≤10 °C. Dielectric spectroscopy w...

The results of dielectric studies of 5-n-hexyl-2-(4'-isothiocyanato)-l,3-dioxane (6DBT) in the smectic A, phase at pressures up to 150 MPa and temperatures up to 340 K are presented. The low frequency relaxation time T\\ (/?, T) yields the activation volume AV|| = RT(d ln Tjj/9/>)rand activation enthalpy A//jj = R(d ln T | | / 3 7 ) p . The calculated values of these parameters are compared wit...

The effects of microcapsulated docosahexaenoic acid powder (hereinafter DHA powder) on some viscoelastic properties of wheat flour dough and loaf volume were studied. The addition of DHA powder in the range of 0.1 to 0.3% caused a significant increase in the loaf volume of bread after baking. Dough containing 0.2 or 0.3% DHA powder had greater modulus of elasticity, viscosity coefficient and re...