Results 21 to 30 of about 38,569 (201)

Irradiation‐Induced Spin Bath Evolution and as‐Grown Hydrogen Defects in CVD Diamond Revealed by NV‐Based DEER Spectroscopy

open access: yesAdvanced Functional Materials, EarlyView.
Here, we provide the reader with the current state of the art in the fabrication of high‐T2‐coherence diamond, optimized through the use of double electron–electron resonance (DEER) spectroscopy. We reveal the main as well as yet unidentified spin defects, the reduction of which is essential for reducing the spin bath and fabricating materials for ...
Olga Rubinas   +6 more
wiley   +1 more source

La soberanía en la provincia de Mariquita en el contexto de las primeras repúblicas latinoamericanas, 1808-1816

open access: yesHistoria y Memoria
La construcción de las repúblicas latinoamericanas en el siglo XIX demandó el replanteamiento de las nociones democráticas de representación, pueblo y soberanía.
Rodrigo Andrés Bocanegra Calderón
doaj   +1 more source

Hydrophobic MFI‐Type Zeolites via Alkali‐Cation‐Induced Defect Healing: Implications for Adsorbent and Catalyst Design

open access: yesAdvanced Materials, EarlyView.
Sub‐stoichiometric amounts of Na+ or K+ enhance defect healing during Silicalite‐1 (MFI) and TS‐1 calcination by promoting Si–O–Si annealing and healing framework vacancies. The resulting defect‐free zeolites are more hydrophobic and show improved butanol/water separation and improved activity and selectivity in the epoxidation of 1‐hexene, offering a ...
Christos Kanteler   +14 more
wiley   +1 more source

La república chilena ante la cuestión indígena (1810-1830)

open access: yesHispania Sacra, 2011
Este artículo analiza la forma en que los patriotas consideraron y resolvieron la inclusión de los indios en el nuevo sistema político a construir en Chile a partir de 1810 en base a tres aspectos interrelacionados.
Lucrecia Raquel Enríquez
doaj   +1 more source

Isomeric Ag14 Nanoclusters With Distinct Photophysical and Nanomechanical Properties

open access: yesAdvanced Science, EarlyView.
Ligand‐shell isomerism in atomically precise Ag14 nanoclusters is demonstrated to regulate core distortion, photoluminescence, and mechanical properties. Subtle changes in phosphine ligand arrangement drive a pronounced emission shift from green to red and alter crystal rigidity, revealing a direct structure‐property correlation that offers new design ...
Vivek Yadav   +14 more
wiley   +1 more source

Bypassing Heteronuclear MRI: Metal‐Free Organosilicon Nanotracers for Background‐Free Hotspot 1H Imaging on Clinical Hardware

open access: yesAdvanced Science, EarlyView.
Organosilicon micelles enable background‐free molecular magnetic resonance imaging (MRI) while remaining fully compatible with standard proton (1H) hardware. By exploiting a spectrally silent 1H window at ∼0 ppm, the silicone nanotracer allows hotspot detection by 1H chemical‐shift imaging (CSI) without metals or heteronuclei, enabling direct overlay ...
Martin Orsagh   +4 more
wiley   +1 more source

ACUERDO ARGENTINA CHILE

open access: yesAportes para la Integración Latinoamericana, 2017
Acuerdo Argentina -  Chile Tratado de maipú de integración y cooperación argentina - chile, Maipú, Chile, 30 de octubre 2009 Declaración presidencial  Conjunta argentina – chile, Santiago de Chile, Chile, 29 y 30 de octubre ...
Repüblica Argentina República de Chile
doaj  

Monarquismo y republicanismo : las primeras regencias de España y México

open access: yesEspacio, Tiempo y Forma. Serie V, Historia Contemporánea, 2010
El estudio analiza la construcción de los primeros poderes ejecutivos colegiados o regencias en España y México (1809- 1823). La perspectiva comparada, le permite al autor enfatizar las convergencias y divergencias de ambos tipos de regencias ...
Israel Arroyo
doaj   +1 more source

Os aniversários da abolição da escravatura e a imprensa ilustrada do Rio de Janeiro (1890-1902)

open access: yesTopoi
RESUMO A imprensa ilustrada do Rio de Janeiro celebrou em suas páginas os aniversários da Lei Áurea, que libertou os escravos em 1888. As celebrações da data ocorreram, sobretudo, nos anos 1890, os primeiros do novo regime político advindo com a ...
Aristeu Elisandro Machado Lopes
doaj   +1 more source

La Democracia en América Latina: la alternativa entre populismo y democracia deliberativa

open access: yesIsegoría, 2011
En Política VI 2, 1317b 1-17, Aristóteles define así la democracia: «el rasgo esencial de la democracia es el vivir como se quiere sin ninguna interferencia y de aquí vino el de no ser gobernado, si es posible por nadie, y si no, por turnos.
Osvaldo Guariglia
doaj   +1 more source

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