Results 11 to 20 of about 150,499 (207)

Densities and excess molar volumes of the binary systems of the ionic liquid trihexyl(tetradecyl)phosphonium bromide mixed with acetonitrile or tetrahydrofuran at temperatures from 293.15 to 313.15 K

open access: yesFrontiers in Physics, 2023
Experimental densities and excess molar volumes of two binary mixtures composed of the ionic liquid trihexyl(tetradecyl)phosphonium bromide ([THTDP][Br]) mixed with acetonitrile (ACN) or tetrahydrofuran (THF) are reported in this work.
Octavio Elizalde-Solis   +5 more
doaj   +1 more source

Methane Hydrate Behavior for Water–Oil Systems Containing CTAB and Synperonic PE/F127 Surfactants

open access: yesEnergies, 2022
Methane hydrates were studied in systems containing aqueous dissolved surfactants in oil emulsions with a volume ratio of 40/60. Two commercial surfactants, named synperonic PE/F127 and cetyltrimethylammonium bromide, were evaluated at 0, 350, 700 and ...
Antonio Pavón-García   +4 more
doaj   +1 more source

Alternativas del uso de la cascarilla de arroz como fuente energética

open access: yesRevista Fuentes El Reventón Energético, 2021
Los combustibles fósiles son la mayor fuente energética en el mundo y Colombia no es la excepción a la regla, es por esta razón que el presente artículo plantea estudiar alternativas del uso de cascarilla de arroz como fuente energética en Colombia. Para
Angie Tatiana Ortega Ramírez   +1 more
doaj   +1 more source

Gasification of Psidium guajava L. Waste Using Supercritical Water: Evaluation of Feed Ratio and Moderate Temperatures

open access: yesEnergies, 2021
Biomass waste, as raw material for renewable energy, is an attractive alternative since it does not compete with human food supply. An emerging alternative for its treatment is supercritical water gasification (SCWG), due to the high moisture content of ...
Sandro González-Arias   +5 more
doaj   +1 more source

Estudio exploratorio sobre la comprensión de los conceptos de evaporación, condensación y presión de vapor en estudiantes universitarios

open access: yesEducación Química, 2011
La Ingeniería Química y la Química Industrial son profesiones en las cuales los fundamentos de ciencia son aplicados al diseño de procesos químicos.
Adolfo Obaya Valdivia   +2 more
doaj   +1 more source

Bacterial Modulation of the Plant Ethylene Signaling Pathway Improves Tolerance to Salt Stress in Lettuce (Lactuca sativa L.)

open access: yesFrontiers in Sustainable Food Systems, 2022
Salinity has extensive adverse effects on plant growth and the development of new agronomic strategies to improve crop salt tolerance is becoming necessary.
Jonathan Fortt   +12 more
doaj   +1 more source

Primera Parte: Las carreras y grados en las universidades estatales (1864-1989).

open access: yesIngeniería, 2011
En este artículo se presentan los hitos históricos de la enseñanza universitaria estatal de la ingeniería en Costa Rica. Se estudian las carreras y los grados ofrecidos. La Universidad de Santo Tomás aprueba en 1864 un plan de estudio en ingeniería, con
Wilbert Ezequiel Solano Rojas
doaj   +1 more source

La enseñanza remota ante el COVID-19: Experiencias de la docencia en cuatro asignaturas de la UAM-I

open access: yesEducación Química, 2020
En este trabajo presentamos algunas experiencias sobre la preparación y conducción de los cursos en el periodo previo, y durante el trimestre 20-I en un entorno completamente virtual debido a la contingencia sanitaria prevalente.
Jaqueline Padilla-Zúñiga   +3 more
doaj   +1 more source

Evaluation of Temperature on the Methane Hydrates Formation Process Using Sodium Surfactin and Rhamnolipids

open access: yesEnergies, 2023
The performance of chemical and biological additives in the methane hydrates formation and dissociation processes is of relevance for the development of gas-transport and gas-storage systems.
Antonio Pavón-García   +4 more
doaj   +1 more source

Pyrolysis Kinetics of Byrsonima crassifolia Stone as Agro-Industrial Waste through Isoconversional Models

open access: yesMolecules, 2023
This study is aimed at the analysis of the pyrolysis kinetics of Nanche stone BSC (Byrsonima crassifolia) as an agro-industrial waste using non-isothermal thermogravimetric experiments by determination of triplet kinetics; apparent activation energy, pre-
Jonathan M. Sanchez-Silva   +9 more
doaj   +1 more source

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