Results 41 to 50 of about 2,713 (108)

Análisis espectroscópico de billetes poliméricos de la segunda serie de Costa Rica

Tecnología en Marcha
La falsificación de billetes es un problema persistente en Costa Rica, por lo que garantizar su autenticidad es esencial para la seguridad económica y la confianza en el sistema financiero. Para ello, los billetes incorporan diversas medidas de seguridad,
James Andrés Ruiz-Vásquez, Ernesto Montero-Zeledón   +1 more
doaj   +1 more source

Mecano Síntesis

Revista de Investigación de Física, 1998
La mecano-síntesis es una técnica de producción de nuevos materiales metálicos en fases fuera del equilibrio termodinámicos, tales como soluciones sólidas extendidas, solcuiones sólidas amorfas, fases nanocristalinas, fases nanovítreas, cuasicristales ...
Víctor Antonio Peña Rodríguez
doaj   +1 more source

Resonancia Magnética Nuclear en Costa Rica: una perspectiva histórica

Tecnología en Marcha
La Resonancia Magnética Nuclear (RMN) es una técnica ampliamente utilizada para la elucidación y caracterización estructural de moléculas orgánicas gracias a la interacción de la materia con un campo magnético.
José Andrés Borloz-Chinchilla, Isaac Fabián Céspedes-Camacho   +1 more
doaj   +1 more source

Tree and mycorrhizal fungal diversity drive intraspecific and intraindividual trait variation in temperate forests: Evidence from a tree diversity experiment

Functional Ecology, Volume 38, Issue 5, Page 1089-1103, May 2024.
Read the free Plain Language Summary for this article on the Journal blog. Abstract The study of tree species coexistence is crucial to understand the assembly of forest communities. In this context, trees adjust their traits in response to the interactions with other trees and, specifically, as a result of the competition for resources.
Pablo Castro Sánchez‐Bermejo, Tilo Monjau, Kezia Goldmann, Olga Ferlian, Nico Eisenhauer, Helge Bruelheide, Zeqing Ma, Sylvia Haider   +7 more
wiley   +1 more source

Radiation-driven stellar winds at the fast–slow transition: New hydrodynamic solutions

Astronomy & Astrophysics
Context. Radiation-driven winds of massive stars can be described within the modified Castor-Abbott-Klein theory, which parametrises the radiation force through three key quantities: α, δ, and k.
Fernandez M. C., Venero R. O. J., Cidale L. S., Araya I., Curé M.   +4 more
doaj   +1 more source

T = 0 and T = 1 states in the N = Z nucleus 64Ge and the M1 transition “quasi-rule” [PDF]

EPJ Web of Conferences
The decay scheme of 64As into 64Ge is revisited in this paper, together with the discussion of the isospin assignment to the excited states based on the M1 transition “quasi-rule”.
Rubio Berta, Aguilera Pablo, Gelletly William   +2 more
doaj   +1 more source

Simultaneous Photocatalytic CO₂ Reduction and Methylene Blue Degradation over TiO₂@(Pt, Au, or Pd)

Photochem
In this work, the photocatalytic reduction of CO2 was innovatively tested with the simultaneous removal and mineralization of a textile contaminant, methylene blue (MB), which acts as a sacrificial agent.
Elisenda Pulido-Melián, Cristina Valeria Santana-Fleitas, Javier Araña, Óscar Manuel González-Díaz   +3 more
doaj   +1 more source

Espectroscopia Móssbauer

Revista de Ciencias, 1989
En los núcleos, como en los átomos, existen niveles de energía y cuando el núcleo pasa de un estado a otro de más baja energía ocurre la emisión de rayos y.
Germán A. Pérez
doaj   +1 more source

Rotational Spectrum and Search for Lactonitrile toward Sgr B2(N)

The Astrophysical Journal
Laboratory experiments on interstellar ice analogs have demonstrated that ice mixtures containing acetaldehyde (CH _3 CHO) and hydrogen cyanide (HCN) in the presence of ammonia (NH _3 ), water (H _2 O), or an NH _3 /H _2 O mixture allow the formation of ...
A. Insausti, E. R. Alonso, L. Kolesniková, A. Belloche, I. León, S. Mato   +5 more
doaj   +1 more source

Análise arqueométrica de pintura rupestre do sítio Poções, Bahia, Brasil

Revista de Arqueologia, 2009
O sítio de arte rupestre Poções está localizado na área rural da cidade de Gentio do Ouro, Bahia, Brasil. As paredes de arenito estão cobertas de grafismos geométricos, havendo poucos motivos antropomórficos, zoomórficos muito esquematizados e escassos ...
Luis Carlos Duarte Cavalcante, Maria Conceição Soares Meneses Lage, José Domingos Fabris, Carlos Alberto Etchevarne   +3 more
doaj   +1 more source