Now showing items 1-10 of 91
A model of chemical association in binary mixtures
A general model of chemical association is presented for the correlation of activities of components of a binary mixture A + B with negative deviation from Raoult's law. The model takes into account the coexistence in ...
Lignanos de Zanthoxylum acuminatum
From the aerial parts of Zanthoxylum acuminatum (Rutaceae) collected in Upala, Alajuela, Costa Rica were isolated the known lignans hinokinin, (+)-asarinin, (+)- piperitol, (+)-kobusin, and epi-kobusin. In addition to the ...
VISCOUS-FLOW MECHANISM OF #6 FUEL OIL – PALM OLEIN MIXTURES
Viscous-flow mechanism of #6 fuel oilpalm olein mixtures
The viscosities of mixtures of #6 fuel oil and palm olein at 60 °C do not obey Kendall-‐‐Monroe equation. Molecular considerations predict deviation from ideal-‐‐mixture ...
La lógica difusa en ingeniería: principios, aplicaciones y futuro
Fuzzy logic is a mathematical tool that mimics the way humans manage and process information. It is a method of great simplicity for processing of information, decision making and process control. This article discusses ...
SYNTHESIS, CHARACTERIZATION AND REDOX BEHAVIOUR OF MIXED LIGAND COPPER(II) SACCHARINATE COMPLEXES
Synthesis, characterization and redox behaviour of mixed ligand copper(II) saccharinate complexes
Three mixed-ligand complexes of Cu(II) with saccharin (sac), pyrazole, (Hpz), imidazole, (Himid) were synthesized and characterized on the basis of elemental analysis, FT-IR spectroscopy, magnetic susceptibility, EPR ...
SOLUCIÓN DE UNA ECUACIÓN DIFERENCIAL PARCIAL DE DIFUSIÓN
Solución de una ecuación diferencial parcial de difusión
Utilizing the Laplace transform, an algorithm is shown that solves the partial differential equation, product from the application of the Fick ́s second law of diffusion. ...
Caracterización del producto del proceso de viscoreducción, para la conversión de aceite vegetal, aceite de alga y búnker
Through the use of a high pressure and high temperature reactor conditions a visbreaking is simulated, with the purpose of producing green fuels, replacing a fraction fuel oil #6 with vegetable oils. A 25% (m/m) of palm ...
THE LEGACY OF VAN DER WAALS
The legacy of van der Waals
The physical implications of the form and nature of the van der Waals equation of state are explained. The relation of this equation to so-‐‐called van der Waals ...
Evaluación de las aguas de drenaje del sector de riego de Tamarindo y su influencia sobre el Parque Nacional Palo Verde
The following physicochemical parameters were measured to determine the quality of the drainage water of Tamarindo Irrigation Sector, at the Arenal-Tempisque Irrigation District: temperature, pH, dissolved oxygen saturation ...
Graph Theory and simple Hueckel Theory applied to benzene
We compare the results of application of graph theory and of simple Hueckel theory in its traditional form to benzene, as an instance of a conjugated molecular system. The ...