Results 21 to 30 of about 150,499 (207)

Una primera evaluación del nuevo plan de estudios de ingeniería química de la UNAM, según los alumnos que lo cursan

open access: yesEducación Química, 2018
En noviembre de 1987, en la Facultad de Química de la UNAM se puso en marcha el nuevo plan de estudios de la licenciatura en Ingeniería Química. Entre los alumnos que ingresamos entonces a esta carrera, de la que somos la primera generación, existía ...
Ernesto Ríos Patrón
doaj   +1 more source

CVN impact energy and fracture characteristics correlations with different oxide nanoparticles improving submerged arc welds

open access: yesMaterials Research Express, 2021
The main aim of this research is to correlate the toughness improvement with fracture features of tested Charpy V-Notch impact specimens obtained from submerged arc welds enriched by different oxide nanoparticles (TiO _2 , SiO _2 , Al _2 O _3 and Mn _2 O
A Jiménez-Jiménez   +7 more
doaj   +1 more source

Mas allá de la resolución de problemas

open access: yesEducación Química, 2018
La resolución de problemas es una actividad existencial recurrente, que quizá, por lo mismo, se emprende de manera rutinaria, razón por la cual se ha trabajado explícita e intencionalmente muy poco en la educación, en donde reina desde hace décadas el ...
Armando Rugarcía Torres
doaj   +1 more source

Fractional Photoconduction and Nonlinear Optical Behavior in ZnO Micro and Nanostructures

open access: yesFractal and Fractional, 2023
A fractional description for the optically induced mechanisms responsible for conductivity and multiphotonic effects in ZnO nanomaterials is studied here.
Victor Manuel Garcia-de-los-Rios   +5 more
doaj   +1 more source

The Hot Ductility, Microstructures, Mechanical Properties and Corrosion Resistance in an Advanced Boron-Containing Complex Phase Steel Heat-Treated Using the Quenching and Partitioning (Q&P) Process

open access: yesMetals, 2023
The objective of this research work is to obtain the hot ductility behavior, and the structural, microstructural and mechanical characteristics of one of the latest generation of AHSS steels, a complex phase (CP) steel microalloyed with boron (0.006 wt.%)
Antonio Enrique Salas-Reyes   +7 more
doaj   +1 more source

Isótopos Estables de Carbono y Nitrógeno y Cromatografía gaseosa en cerámica arqueológica del Nordeste de la Provincia de Chubut (Patagonia Argentina) [PDF]

open access: yes, 2014
El registro arqueológico del nordeste de la provincia del Chubut (costa marina y valle inferior del río Chubut) señala que el área estuvo ocupada desde por lo menos siete mil años atrás por cazadores recolectores que explotaron la costa, el río y las ...
Constenla, Diana Teresita   +2 more
core   +2 more sources

Gallium Oxides Photocatalysts Doped With Fe Ions for Discoloration of Rhodamine Under UV and Visible Light

open access: yesFrontiers in Environmental Science, 2022
Heterogeneous photocatalysis is a highly efficient process for degrading recalcitrant and emerging pollutants. Rhodamine B (RhB) is a nonbiodegradable and highly refractory compound persistent in conventional processes.
S. Orozco   +3 more
doaj   +1 more source

Antioxidant and Fatty Acid Changes in Pomegranate Peel With Induced Chilling Injury and Browning by Ethylene During Long Storage Times

open access: yesFrontiers in Plant Science, 2022
Pomegranate (Punica granatum) is a non-climacteric fruit with a high antioxidant content in arils and peels, of which 92% are anthocyanins and tannins. However, it is susceptible to chilling injury (CI), a physiological disorder concentrated in the peel,
Mónika Valdenegro   +8 more
doaj   +1 more source

Diseño de estrategias conjuntas UA-centros de secundaria para el fomento del conocimiento de disciplinas científico-técnicas [PDF]

open access: yes, 2014
Continuando con la línea emprendida por el Instituto Universitario de Ingeniería de Procesos Químicos, para desarrollar actividades de fomento del conocimiento de disciplinas de ciencia y tecnología, se ha convocado el “VI Certamen de Proyectos ...
Benavent Calvo, Juana María   +12 more
core  

Dual process for improved recovery of essential oil and pectin from citrus waste

open access: yesJournal of Chemical Technology &Biotechnology, EarlyView.
Abstract BACKGROUND Citrus essential oils (EO), particularly orange essential oil (OEO) and pectin, are high‐value chemical products widely used across various industries, including pharmaceuticals, food and beverages, detergents, and cosmetics. These compounds are present in the residual by‐products generated by juice production industries, and their ...
Jorge Welti‐Chanes   +3 more
wiley   +1 more source

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