Refrigerants that are used in refrigeration systems, cause environmental difficulties such as depletion of ozone layer and greenhouse effect. Thus, we must find substitutes for such refrigerants, in this paper, the effect of refrigerant on the thermodynamics performance of refrigeration cycles are studied. To do this, a refrigerator that has designed for R12, is simulated. Results show that pur...

The present work introduces a new form of explicitly correlated factor in the context transcorrelated methods. correlation is obtained from r12 ? 0 mathematical analysis Hamiltonian, and its analytical such that leading order 1/r12 scalar part effective two-electron potential reproduces long-range interaction range-separated density functional theory. resulting exactly imposes cusp tuned by uni...

It is a central issue to elucidate the new type of molecular recognition accompanied by a global structural change of a molecule upon binding to its targets. Here we investigate the driving force for the binding of R12 (a ribonucleic acid aptamer) and P16 (a partial peptide of a prion protein) during which P16 exhibits the global structural change. We calculate changes in thermodynamic quantiti...

Articles you may be interested in Atomic Integrals Containing r23 λ r31 μ r12 v

Electron correlations in molecules can be divided in short range dynamical correlations, long range Van der Waals type interactions, and near degeneracy static correlations. In this work, we analyze for a one-dimensional model of a two-electron system how these three types of correlations can be incorporated in a simple wave function of restricted functional form consisting of an orbital produc...

Electron correlations in molecules can be divided in short range dynamical correlations, long range Van der Waals type interactions and near degeneracy static correlations. In this work we analyze how these three types of correlations can be incorporated in a simple wave function of restricted functional form consisting of an orbital product multiplied by a single correlation function f(r12) de...

AIMS Heart failure remains a leading cause of morbidity, hospitalizations, and deaths. We previously showed that overexpression of the enzyme ribonucleotide reductase (RNR) in cardiomyocytes increased levels of the myosin activator, 2-deoxy-ATP, catalysed enhanced contraction, and improved cardiac performance in rodent hearts. Here we used a swine model of myocardial infarction (MI) to test pre...

This study aimed to explore the dynamic variations of rumen fermentation characteristics and bacterial community composition during a 24 h in vitro fermentation. A total twenty-three samples were collected from original fluid (ORF, n = 3), at 12 (R12, 10), (R24, 10). Results showed that gas production, concentrations microbial crude protein, ammonia nitrogen, individual volatile fatty acids (VF...

Discharge gas temperature value is an indicator of compressor safe operating conditions, particularly on R12 and R502 commercial applications. These refrigerants will be replaced very soon by R134a and R22 respectively, also if R22 is not considered a final solution. High discharge temperatures are typical in LBP-R22 hermetic compressors operating at low evaporating temperature as low as -40"C;...

A quadratic polynomial differential system can be identified with a single point of R12 through the coefficients. Using the algebraic invariant theory we classify all the quadratic polynomial differential systems of R12 having an integrable saddle. We show that there are only 47 topologically different phase portraits in the Poincaré disc associated to this family of quadratic systems up to a r...