Results 31 to 40 of about 23,238 (164)

Synthesis of type A zeolites from natural kaolinite for their application in CO2 capture processes [PDF]

open access: yes, 2017
Climate change is the greatest environmental threat of the 21st century, with major economic, social and environmental consequences. The level of carbon dioxide (CO2) emissions has increased by 31%, therefore, both governments and the scientific ...
Azevedo, Diana C.S.   +5 more
core  

Microscopy and rock magnetism of fine grain-size titanomagnetite from the Jacupiranga Alkaline Complex, Brazil: unearthing Ti-magnesioferrite nanoparticles

open access: yesGeofísica Internacional, 2013
Se seleccionaron muestras muy finas de zonas mineralizadas del complejo Jacupiranga de la mina Cajatí para efectuar la identificación cristalográfica de nanoestructuras de titano-magnesioferrita (TMf) embebidas en titanomagnetita (TM) usando microscopía ...
Luis M. Alva-Valdivia   +4 more
doaj   +1 more source

Water-to-cement ratio influence on low-carbon cements performances [PDF]

open access: yes, 2019
Portland Cement (PC) is the most important active ingredient in most of the construction concrete. However, the PC production is associated with a high carbon dioxide release (around 1 ton of CO2 per ton of PC).
Cuesta-Garcia, Ana Maria   +5 more
core  

Evaluation of Ceramic Properties of Bauxitic Materials from SE of Iberian Range

open access: yesChemEngineering
The use of aluminum-rich clays and bauxites as refractory materials is common. Upon firing, these materials form mullite crystals in the shape of needles embedded in a siliceous and vitreous matrix, with mullite being responsible for the refractory ...
Domingo Martín   +7 more
doaj   +1 more source

El cuarzo como material votivo y arquitectónico en el complejo funerario megalítico de Palacio III (Almadén de la Plata, Sevilla): Análisis contextual y mineralógico

open access: yesTrabajos de Prehistoria, 2008
Este trabajo examina un conjunto de objetos de cuarzo, tales como monocristales (variedades cristal de roca y prasio) y cantos rodados, encontrados en dos contextos arqueológicos espacial y cronológicamente distintos del complejo megalítico de Palacio ...
Matilde Forteza González   +4 more
doaj   +1 more source

Influence of Nb-doping on the structural and electrical properties of lanthanum molybdates, La5.4MoO11.1 [PDF]

open access: yes, 2018
Nowadays, hydrogen is receiving a great deal of attention as an energy carrier. Commonly, it is obtained by hydrocarbons reforming, such as natural gas, coal and biomass.
Canales-Vázquez, J.   +5 more
core  

Co‐Impregnated MgAl Layered Double Hydroxide as an Efficient Catalyst for Glycerol Oligomerization

open access: yesApplied Organometallic Chemistry, Volume 40, Issue 1, January 2026.
A cobalt(II) acetylacetonate–impregnated MgAl LDH catalyst was developed, showing enhanced basicity and superior activity in glycerol oligomerization, achieving 68% conversion and 27% diglycerol selectivity. The catalyst maintained high performance over three recycling cycles, with structural and surface modifications confirmed by comprehensive ...
Fernando José Soares Barros   +5 more
wiley   +1 more source

Mineralogía y génesis de los pisolitos manganesíferos de la mina Do Azul (Carajás, Brasil)

open access: yesRevista del Instituto de Investigación de la Facultad de Minas, Metalurgia y Ciencias Geográficas, 2016
En la mina Do Azul, los pisolitos de manganeso se encuentran diseminados en capas irregulares de rocas lateríticas, que forman pequeñas colinas, recubriendo las laderas y superficies con materiales coluviales de la meseta de Igarapé Do Azul.
Maritza Mercedes Cantorín Vílchez
doaj   +1 more source

PXRD and PDF analysis of multifunctional lanthanide nitrilotris-methylphosphonate-based proton conductors [PDF]

open access: yes, 2017
Metal phosphonates are multifunctional solids which possess tunable properties, such as H-bond networks, while exhibiting high chemical and thermal stability.
Bazaga-García, Montse   +4 more
core  

Filones de cuarzo del Sistema Central: Distribución y caracterización de los fluidos asociados. [PDF]

open access: yes, 1999
Depto. de Mineralogía y PetrologíaFac.
López García, José Ángel   +2 more
core   +1 more source

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