Results 21 to 30 of about 605 (176)
AulaEsta investigación presenta un acercamiento a las características del talento en la escritura académica de estudiantes universitarios de las licenciaturas en Educación y en Enseñanza del Inglés, situado en los catalizadores ambientales e intrapersonales ...
Diana Irasema Cervantes Arreola +2 more
doaj +1 more source
HIDROGENACIÓN DE CROTONALDEHÍDO SOBRE CATALIZADORES Ir/TiO2-SiO2
Dyna, 2009 Se estudió la hidrogenación de crotonaldehído en fase líquida, sobre catalizadores Ir/TiO2-SiO2; este aldehído es altamente contaminante y proviene de fuentes tan diversas como humo de tabaco, gases de escape de motores de gasolina o diesel y humo de combustión de madera [1].
ROJAS, HUGO +4 more
openaire +4 more sources
Facets of Crises: How Problem Indicators and Public Perceptions Affect Policy Change
Policy Studies Journal, EarlyView.ABSTRACT Crises are widely acknowledged as catalysts for policy change. Yet, our understanding of the policy effects of crises remains limited. Why do only some crises lead to major changes, while significant policy changes also occur during seemingly non‐crisis periods?
Constantin Kaplaner +6 more
wiley +1 more source
Changes in the transformative potential of action proposals in Finnish Red Lists from 1986 to 2019
Conservation Biology, Volume 40, Issue 4, August 2026.Abstract Red lists provide critical knowledge regarding biodiversity decline, especially in Finland, where broad assessments have been made regularly since the 1980s. They deliver information on the threat status of species and ecosystems, propose actions to guide conservation policy, and have the potential to spur transformative change.
Anni Arponen +4 more
wiley +1 more source
The frequency and importance of polyploidy in tropical rainforest tree radiations
New Phytologist, Volume 249, Issue 4, Page 2103-2114, February 2026.Summary The presence of more than two copies of the genome in an organism, termed ‘polyploidy’, is a crucial force in plant evolution, generating genetic, phenotypic and ecological diversity. [Correction added on 22 January 2026, after first online publication: the preceding sentence has been corrected.] The Amazonian tree flora is the most species ...
Rowan J. Schley +9 more
wiley +1 more source
Risk, Hazards &Crisis in Public Policy, Volume 16, Issue 3, September 2025.ABSTRACT This article explores the sociohistorical construction of civilian unpreparedness as a public policy issue in Los Angeles, arguing that it emerged not as a neutral response to escalating urban risks, but as a mechanism through which actors negotiated power dynamics amid urban transformations between 1940 and 1980.
Piero Tellerías Melgarejo
wiley +1 more source
Obtención de catalizadores ácidos a partir de la cascarilla de arroz
Mutis, 2017 En este artículo se presenta la obtención de sílice a partir de la cascarilla de arroz, y su aplicación en la síntesis de catalizadores ácidos sólidos.
Jeisson Javier Loaiza Malaver +1 more
doaj +1 more source
Development of Copper Catalysts Supported on Graphite to Produce Butenes by Acetylene Dimerization
ChemCatChem, Volume 17, Issue 16, August 18, 2025.The incorporation of copper nanoparticles on the graphite surface leads to the development of catalytic materials capable of selectively hydrogenating acetylene into ethylene and promoting the dimerization reaction to produce butenes. The catalytic properties can be modulated depending on the metal precursor employed. Based on our experimental data, it
Eduardo Campos‐Castellanos +3 more
wiley +1 more source
Revista Facultad de Ingeniería Universidad de Antioquia, 2006 La gran dificultad que se presenta en la disolución del oro por cianuración, cuando se encuentra en minerales sulfurados, es un hecho ampliamente conocido en la metalurgia extractiva.
Olger Giovani Mendoza Villabona +1 more
doaj
Green Processing and Synthesis, 2017 The preparation of MoxSy nanoparticles with different morphologies via a surfactant-assisted one-pot solvothermal route was reported. The concentration of surfactant was studied to evaluate its effects on the morphology and the size of the as obtained ...
Akram Hanane +5 more
doaj +1 more source