Results 31 to 40 of about 44,846 (219)

Synthesis and characterization of amphiphilic nitroxide 1,1,3,3–tetraethylisoindoline–2–oxyl–5–sodium sulfonate (TEIOSNa)

open access: yesThe Canadian Journal of Chemical Engineering, EarlyView.
Abstract The synthesis and characterization of an amphiphilic nitroxide to be used as a controlling agent in a nitroxide‐mediated living radical polymerization in aqueous dispersion media is presented. In the first stage of nitroxide synthesis (phthalimide protection), two reaction methods were employed: traditional and microwave.
Enrique García‐Leal   +3 more
wiley   +1 more source

De graduados a doctorandos: un ejemplo mexicano y una ranchera norteña

open access: yesInvestigaciones y Ensayos, 2016
El artículo plantea algunas reflexiones acerca de la situación de los posgrados en Historia en Argentina a partir de mi experiencia en El Colegio de México y en un doctorado argentino.
Gabriela Tío Vallejo
doaj   +2 more sources

Design and implementation of a 3D‐printed modular distillation tower for experimental teaching in chemical engineering

open access: yesThe Canadian Journal of Chemical Engineering, EarlyView.
Abstract Several authors have reported the disconnection between the skills, abilities, and attitudes of graduates from STEM careers with the current needs of the labour market. In science and engineering fields, research has found the need for interdisciplinary approaches that encourage meaningful learning.
Úrsula Manríquez‐Tolsá   +7 more
wiley   +1 more source

LAS POLÍTICAS DE EVALUACIÓN Y ACREDITACIÓN UNIVERSITARIA EN LA ARGENTINA [PDF]

open access: yes, 2013
En la Argentina la evaluación universitaria comienza en la década del noventa acompañando una serie de cambios en la educación superior que, entre otros aspectos, involucran la aprobación de la Ley de Educación Superior, a cargo de la regulación del ...
Dávila, Mabel, Guaglianone, Ariadna
core  

Healthy Snacks Elaborated With Decoction Residues of Hibiscus sabdariffa L: Physical and Sensory Characteristics

open access: yesFood Chemistry International, EarlyView.
Healthy snacks formulated with food by‐products are gaining interest within the food industry. Decoction residues of Hibiscus sabdariffa (roselle) retain thermostable polyphenols. Extruded snacks enriched with roselle showed a reduction in the expansion index as the roselle concentration increased.
Monserrat Hernández‐Bautista   +3 more
wiley   +1 more source

Multitemporal study to determining changes in landcovers in a defined polygon of 50 route in section 5 “El Rosal – El Vino” of Cundinamarca for the period of 2007 – 2014 [PDF]

open access: yes, 2015
En el año de 1994, el Instituto Nacional de Vías, hoy INVIAS, contrató la Concesión 447 con la Concesión Sabana Occidente, para la realización de las actividades de elaboración de estudios, diseños definitivos, obras de rehabilitación, construcción ...
Ríos Olaya, Sandra Marcela
core  

A Comprehensive Multistage Average Controller for Trajectory Tracking in Solar‐Powered Mobile Robots: Analysis of Actuator‐Driver and Power Stage Integration

open access: yesInternational Journal of Mechanical System Dynamics, EarlyView.
ABSTRACT This work addresses the challenge of bidirectional trajectory tracking in solar‐powered wheeled mobile robots (WMRs), considering the mechanical structure, actuator‐driver, and power stage subsystems. Notably, this is the first study to explicitly model and control the actuator‐driver subsystem within this context. The proposed solution relies
Benjamin Natanael Santiago‐Nogales   +8 more
wiley   +1 more source

Itineraries for the training of educational researchers in Mexico [PDF]

open access: yes, 2019
El objetivo del artículo es conocer los itinerarios que sigue la Formación de Investigadores Educativos (FIE) en México, así como los sentidos que se dan a esta formación en el escenario actual marcado por la mercantilización de la educación.
Acuña Gamboa, Luis Alan   +1 more
core   +2 more sources

Management and incipient domestication of Chamaedorea tepejilote in agroforestry systems in Mexico

open access: yesPLANTS, PEOPLE, PLANET, EarlyView.
Native wild plants are key elements in addressing global biodiversity loss and supporting sustainable food systems. We investigated how rural communities in Mexico manage Chamaedorea tepejilote, a wild palm with edible male inflorescences, by combining ethnobotanical, genetic, morphological and ecological approaches.
Viviana Andrade   +7 more
wiley   +1 more source

La calidad en los programas de posgrados en educación en el Estado de Chiapas. Un estudio descriptivo y exploratorio

open access: yesRECUS, 2018
El siguiente artículo presenta los resultados de una investigación que tuvo como objetivo analizar el sistema de posgrados en educación, en el Estado de Chiapas, para identificar los criterios de calidad en la formación; puesto que se privilegia poco la
José Bastiani Gómez   +3 more
doaj   +1 more source

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