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Mostrando ítems 431-440 de 527
Artículo
Palladium(II) carboxylates and palladium(I) carbonyl carboxylate complexes as catalysts for olefin cyclopropanation with ethyl diazoacetate
(Royal Society of Chemistry (Great Britain), 2009)
Palladium(I) carbonyl carboxylate complexes [Pd(μ-CO)(μ-RCO2)]n (R = Me, n = 4; R = CMe3, n = 6) and the corresponding palladium(II) carboxylates (acetate and pivalate) catalyze the cyclopropanation of olefins with ethyl ...
Capítulo de Libro
El periodismo profesional y el desafío de las weblogs
(Sociedad Española de Periodística, 2005)
Ponencia
Overdamped deterministic ratchets driven by multifrequency forces
(Jagellonian University, Cracow, 2006)
We investigate a dissipative, deterministic ratchet model in the overdamped regime driven by a rectangular force. Extensive numerical calculations are presented in a diagram depicting the drift velocity as a function of a ...
Ponencia
Análisis numérico de pandeo de paneles rigidizados de material compuesto
(AEMAC (asociación española de materiales compuestos), 2009)
Uno de los elementos estructurales que mayor interés ha despertado en las últimas décadas para su fabricación con materiales compuestos han sido los paneles rigidizados empleados en los recubrimientos de los fuselajes, ...
Artículo
Organic and conventional dairy goat production systems in Andalusian mountainous areas
(CIHEAM / DRAP-Norte / FAO, 2009)
Organic goat production is poorly developed in Spain. Conventional dairy goat production systems located in Andalusian mountainous areas greatly depend on pasturing which implies that its transformation to organic model ...
Artículo
Improved di-neutron cluster model for 6 He scattering
(American Physical Society, 2007)
The structure of the three-body Borromean nucleus He6 is approximated by a two-body di-neutron cluster model. The binding energy of the 2n-α system is determined to obtain a correct description of the 2n-α coordinate, as ...
Ponencia
A computational approach to free divisors and logarithmic D-modules
(Universidad de La Rioja, Departamento de Matemáticas y Computación, 2001)
We apply algorithmic techniques for comparing some D-modules associated to a kind of divisors in Cn.
Artículo
Correct denition of the Poynting vector in electrically and magnetically polarizable medium reveals that negative refraction is impossible: comment
(Optical Society of America, 2009)
It is shown that, when all macroscopic currents associated with the electric and magnetic polarizability are properly accounted for, the standard expression for the Poynting vector and the average work exerted by the ...
Artículo
Development of a recording water flow meter using ultrasonic measurement of water levels in a slotted U-pipe
(Elsevier, 2007)
The accurate measurement and recording of water flow rates is necessary in the perfor-mance of field experiments in irrigation, overland flow or drainage studies. There is a lack of reliable, low-cost commercial flow ...
Ponencia
A novel low-voltage reconfigurable ΣΔ modulator for 4G wireless receivers
(2008)
This paper presents a new adaptable cascade ΣΔ modulator architecture fo r low-voltage multi-stan- dard applications. It uses two reconfiguration strategies: a programmable global resonation and a variable loop-filter ...