Results 21 to 30 of about 23,238 (164)
Academia XXII, 2019 En el presente artículo, se describen los resultados de un proyecto de investigación llevado acabo para caracterizar las propiedades fisicoquímicas de cinco tipos de roca volcánica (riodacita), comúnmente conocida como "cantera", tradicionalmente ...
Heidy Gómez Barranco +3 more
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Evolution of magnetic phases located in Boyacá clays subject to high temperatures
Ingeniería Investigación y Desarrollo, 2016 In this paper we analyze clay samples obtained from the region of Tunja Boyacá to study the effect of heating temperature in the color of these materials and at the same time as indicative of the nature and distribution of constituents iron oxide Fe2 O3 .
Oscar Orlando Ruge-Guerrero +2 more
doaj +1 more source
Geofísica Internacional, 2002 El basamento local del campo geotérmico Los Humeros está formado por un complejo metamórfico del Paleozoico y una secuencia sedimentaria, constituida por lutitas ricas en cloritas y muscovitas del Mesozoico, y una intrusión granítica del Terciario ...
E. Portugal +3 more
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Revista de Metalurgia, 2007 La investigación microscópica de menas metálicas ha sido, desde sus inicios, una importante herramienta para el control del proceso mineralúrgico. El volumen de las operaciones actuales es tal que este control es imposible por los métodos clásicos, pero ...
E. Berrezueta, R. Castroviejo
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Estudios Geologicos, 1993 El Cretácico inferior del Anticlinorio de Bilbao está constituido por un potente conjunto de materiales sedimentarios, que tradicionalmente se ha organizado mediante tres sistemas de referencia: Wealdense, Urgoniano y Supraurgoniano.
J. Arostegui +4 more
doaj +1 more source
Subsolidus processes in the Longonjo and Bailundo carbonatites (Angola) [PDF]
, 2012 Peer ReviewedPostprint (published ...
Alfonso Abella, María Pura +4 more
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Geostandards and Geoanalytical Research, EarlyView.Key Points Low‐Mg calcite RM developed for in situ microanalysis applications in palaeoclimatology (δ18O, δ13C; Mg, Sr m/m). New data for calcite CRM IAEA‐603 (δ18O, δ13C by SIMS and GS‐IRMS; Mg m/m). No detectable IMF effect of Mg on SIMS δ18O determinations for mass fractions < 3650 μg g‐1.
Andreas T. Hertwig +13 more
wiley +1 more source
Evaluation of bricks durability using destructive and nondestructive methods (DT and NDT)
Materiales de Construccion, 2003 We have studied the physical-mechanical behaviour of solid bricks treated with consolidants and/or water-repellents in accelerated aging tests to determine their durability.
G. Cultrone +3 more
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Ammonia effects on proton conductivity properties of coordination polymers [PDF]
, 2016 Crystalline metal phosphonates are referred to as a type of structurally versatile coordination polymers [1]. Many of them contain guest molecules (H2O, heterocyclics, etc.), acidic sites and, furthermore, their structure can be also amenable for post ...
Bazaga-García, Montse +6 more
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Beyond species means – the intraspecific contribution to global wood density variation
New Phytologist, Volume 249, Issue 6, Page 2630-2651, March 2026.Summary Wood density is central for estimating vegetation carbon storage and a plant functional trait of great ecological and evolutionary importance. However, the global extent of wood density variation is unclear, especially at the intraspecific level. We assembled the most comprehensive wood density collection to date, including 109 626 records from
Fabian Jörg Fischer +105 more
wiley +1 more source