Results 61 to 70 of about 26,634 (239)
Mineralogia, geoquímica e evolução da lateritização em Apuí, sudeste do Amazonas
, 2015 Chemical analysis, XRD and SEM carried out in bauxites, Fe-rich and siliceous Fe-Al duricrusts of southeast of Amazonas state, associated to relief study, aimed to discuss the process that led to the formation and preservation of crusts through the ...
M. Albuquerque +1 more
semanticscholar +1 more source
Angewandte Chemie, Volume 137, Issue 48, November 24, 2025.Chemische Gärten sind selbstorganisierte abiotische Strukturen mit „lebensähnlichen” Formen. Hier zeigen wir, dass solche Prozesse auch nach Zugabe konzentrierter Sulfatlösungen zu festen Calciumsalzen ablaufen und sogenannte Gipsgärten ergeben. Die dafür nötigen Bedingungen sind weitgehend kompatibel mit den geochemischen Verhältnissen auf dem frühen ...
Selina Reigl +5 more
wiley +1 more source
Minería y Geología, 2010 Este estudio presenta una evaluación mineralógica semi-cuantitativa de las cortezas de meteorización no niquelíferas en las áreas de Baconal, El Culebro, Caimanes y Farallones en la región nororiental de Cuba.
Gerardo Orozco-Melgar +3 more
doaj
Tunable crystal structure and proton conductivity of lanthanide nitrilotrismethylphosphonates [PDF]
, 2018 Metal phosphonates are multifunctional solids with remarkable stability and proton conducting properties owing to their structure is usually composed of extended hydrogen-bond networks that favor proton transfer pathways [1]. Moreover, these properties
Bazaga García, Montse +6 more
core
, 2014 Em solos acidos de ambiente mais tropical com esmectitas, assim como em solos altamente tamponados de ambiente subtropical, contendo esmectita com hidroxi-Al entrecamadas (EHE) e, ou, vermiculita com hidroxi-Al entrecamadas (VHE), os teores de Al-KCl ...
G. Cunha +2 more
semanticscholar +1 more source
Angewandte Chemie International Edition, Volume 64, Issue 48, November 24, 2025.Chemical gardens are self‐assembled architectures with “life‐like” morphologies that form in the absence of any biological activity. Here we show that such structures can also be obtained by contacting reservoirs of calcium and sulfate ions, under conditions that plausibly emulate those prevailing on early Mars.
Selina Reigl +5 more
wiley +1 more source
Geogaceta, 2022 El estuario del río Guadiana se encuadra en el Sur de la Península Ibérica, concretamente en la frontera entre España y Portugal; el río atraviesa en su último tramo la Faja Pirítica Ibérica, donde se localizan importantes yacimientos mineros que han ...
Angel Moreno-Moreno +3 more
doaj +1 more source
Quantitative phase Analisis: A comparative study of Mo and Cu strictly monochromatic radiations [PDF]
, 2016 A comparison of the Rietveld quantitative phase analyses (RQPA) obtained using Cu-Kα1, Mo-Kα1, and synchrotron strictly monochromatic radiations is presented.
Cuesta-Garcia, Ana Maria +7 more
core
Mineralogia da fração argila de solos localizados em ilhas no alto Rio Paraná, PR/MS
, 2014 The Mutum and Porto Rico islands are part of the archipelago Mutum-Porto Rico, located in the upper Parana River between the cities Porto Rico, PR and Taquarucu, MS. The soils are formed by constituents inherited from parent materials, organic compounds,
Paulo Henrique Marques de Castro +2 more
semanticscholar +1 more source
ChemCatChem, Volume 17, Issue 21, November 10, 2025.Desulfurization in the FCC riser is achieved by modifying zeolite catalysts with La3+ ions, promoting H2S formation from thiophenic compounds while suppressing secondary reactions. This approach enhances gasoline quality by increasing selectivity for H2S and enabling efficient condensation and alkylation, supporting cleaner fuel production and ...
Ronaldo C. Santos +8 more
wiley +1 more source