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Aproximadamente 33 registro(s) hasta el momento: (journal)

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Recurso libre

Spectroelectrochemical study of the oxidation of aminophenols on platinum electrode in acid medium
Salavagione, Horacio Javier - Arias Pardilla, Joaquín - Garcés Terradillos, Pedro - Morallón Núñez, Emilia - Barbero, César Alfredo - Vázquez Picó, José Luis

Formato:	info:eu-repo/semantics/article
Enlaces:	The electrochemical oxidation of para-, meta- and ortho-aminophenols was carried out using a platinum electrode in aqueous acid medium. The spectroscopic results indicate that p-aminophenol suﬀers hydrolysis giving the formation of hydroquinone/p-benzoquinone. CO2 has been detected by in situ FTIR…
Fecha:	2008-09-25
Recurso:	RUA Docencia

Recurso libre

An analysis of the classical Doppler effect
Neipp López, Cristian - Hernández Prados, Antonio - Rodes Roca, José Joaquín - Márquez Ruiz, Andrés - Beléndez Vázquez, Tarsicio - Beléndez Vázquez, Augusto

Formato:	info:eu-repo/semantics/article
Enlaces:	The Doppler effect is a phenomenon which relates the frequency of the harmonic waves generated by a moving source with the frequency measured by an observer moving with a different velocity from that of the source. The classical Doppler effect…
Fecha:	2009-01-30
Recurso:	RUA Docencia

Recurso libre

Alpha-dense curves in infinite dimensional spaces
Mora Martínez, Gaspar - Mira López, Juan Antonio

Formato:	info:eu-repo/semantics/article
Enlaces:	The theory of α−dense curves in the euclidean space Rn , n ≥ 2, was developed for finding algorithms for Global Optimization of multivariable functions ([1], [6]). The α-dense curves, considered as a generalization of Peano curves or space-filling curves,…
Fecha:	2011-01-12
Recurso:	RUA Docencia

Recurso libre

Surface modifications of EVA copolymers induced by low pressure RF plasmas from different gases and their relation to adhesion properties
Cepeda Jiménez, Carmen María - Torregrosa Maciá, Rosa - Martín Martínez, José Miguel

Formato:	info:eu-repo/semantics/article
Enlaces:	Two ethylene vinyl acetate (EVA) copolymers (12 and 20 wt% of vinyl acetate,VA, content) have been treated with low pressure RF plasmas from non-oxidizing gases (Ar, N2) and oxidizing gases (air, a mixture of 4N2: 6O2 (v/v), O2 and CO2).…
Fecha:	2007-10-31
Recurso:	RUA Docencia

Recurso libre

Chemical modification of styrene –butadiene –styrene (SBS) rubber by reactive grafting with maleic anhydride
Lasalle, Verónica Leticia - Failla, Marcelo Daniel - Vallés, Enrique Marcelo - Cepeda Jiménez, Carmen María - Torregrosa Maciá, Rosa - Martín Martínez, José Miguel

Formato:	info:eu-repo/semantics/article
Enlaces:	A procedure to increase the adhesion of block styrene–butadiene–styrene (SBS) rubber consisting of the reactive grafting with maleic anhydride (MA) in the presence of an organic peroxide radical initiator is proposed. The influence of the reactive grafting on the surface…
Fecha:	2007-10-31
Recurso:	RUA Docencia

Recurso libre

Genetic relationships among some species groups within the genus Lutzomyia (Diptera: Psychodidae)
Torgerson, Dara G. - Lampo, Margarita - Velásquez Zambrano, Yelitza - Woo, Patrick T.K.

Formato:	info:eu-repo/semantics/article
Enlaces:	Molecular data on Lutzomyia are very scarce, despite the fact that this genus includes all the species involved in the transmission of leishmaniasis in America. We examine the genetic relationships among eight morphologic groups within the Lutzomyia genus and two…
Fecha:	2007-11-05
Recurso:	RUA Docencia

Recurso libre

Near-field light distributions propagated from human corneas: determination of relevant patterns
Mas Candela, David - Pérez Rodríguez, Jorge - Vázquez Ferri, Carmen - Hernández Poveda, Consuelo - Illueca Contri, Carlos

Formato:	info:eu-repo/semantics/article
Enlaces:	A procedure to determine the best image range of distances that can be obtained from an aphakic eye is presented. Corneal surfaces are calculated from videokeratographic data. Light distributions at different distances inside the eye are calculated with a near-field…
Fecha:	2007-10-16
Recurso:	RUA Docencia

Recurso libre

Stabilization of volume gratings recorded in polyvinyl alcohol-acrylamide photopolymers with diffraction efficiencies higher than 90%
Gallego Rico, Sergi - Neipp López, Cristian - Ortuño Sánchez, Manuel - Beléndez Vázquez, Augusto - Pascual Villalobos, Inmaculada

Formato:	info:eu-repo/semantics/article
Enlaces:	Obtaining holographic volume gratings with high diffraction efficiencies that can be used under white light has been a serious problem for the polyvinyl alcohol-acrylamide-based photopolymers developed by other researchers. In this paper we propose to eliminate the residual monomer in…
Fecha:	2009-02-03
Recurso:	RUA Docencia

Recurso libre

The influence of the procedure on the dynamic range of bleached silver halide emulsions
Neipp López, Cristian - Beléndez Vázquez, Augusto - Pascual Villalobos, Inmaculada

Formato:	info:eu-repo/semantics/article
Enlaces:	Bleached holograms are one of the most interesting techniques used to produce phase holograms of high quality on photographic emulsions. Of particular interest is the method of fixation-free rehalogenating bleaching. Using Kogelnik's coupled-wave theory we shall obtain information about the…
Fecha:	2009-02-03
Recurso:	RUA Docencia

Recurso libre

10.

Angular responses of the first diffracted order in over-modulated volume diffraction gratings
Neipp López, Cristian - Álvarez López, Mariela Lázara - Gallego Rico, Sergi - Ortuño Sánchez, Manuel - Sheridan, John T. - Pascual Villalobos, Inmaculada - Beléndez Vázquez, Augusto

Formato:	info:eu-repo/semantics/article
Enlaces:	Kogelnik's coupled-wave (CW) theory has been used for decades to predict the diffraction efficiency of volume diffraction gratings. Although this theory has been applied with success to volume diffraction gratings recorded under a great variety of experimental conditions, its predictions…
Fecha:	2009-02-03
Recurso:	RUA Docencia

Recurso libre

11.

Measuring sustainability in a mass tourist destination: pressures, perceptions and policy responses in Torrevieja, Spain
Vera Rebollo, José Fernando - Ivars Baidal, Josep Antoni

Formato:	info:eu-repo/semantics/article
Enlaces:	El debate sobre el desarrollo del turismo sostenible por lo general se centra en las prácticas turísticas a pequeña escala, como el turismo rural o el ecoturismo, inadecuadamente llamadas turismo "alternativo”, a juzgar por los problemas que empiezan a crear.…
Fecha:	2009-11-12
Recurso:	RUA Docencia

Recurso libre

12.

Characterization of a digital camera as an absolute tristimulus colorimeter
Martínez Verdú, Francisco Miguel - Pujol Ramo, Jaume - Capilla Perea, Pascual

Formato:	info:eu-repo/semantics/article
Enlaces:	An algorithm is proposed for the spectral and colorimetric characterization of digital still cameras (DSC) which allows them to be used as tele-colorimeters with CIE–XYZ color output, in cd/m2. The spectral characterization consists in the calculation of the color-matching functions…
Fecha:	2007-09-11
Recurso:	RUA Docencia

Recurso libre

13.

The importance of internal aspects in quality improvement
Llopis Taverner, Juan - Tarí Guilló, Juan José

Formato:	info:eu-repo/semantics/article
Enlaces:	The adoption of ISO 9000 has been justified in terms of the many benefits it generate, although problems may also arise. Such advantages and disadvantages lead to different reasons for seeking certification. Based on these reasons, this paper analyzed the…
Fecha:	2007-09-12
Recurso:	RUA Docencia

Recurso libre

14.

A virtual laboratory for teaching robotics
Candelas Herías, Francisco Andrés - Puente Méndez, Santiago Timoteo - Torres Medina, Fernando - Ortiz Zamora, Francisco Gabriel - Gil Vázquez, Pablo - Pomares Baeza, Jorge

Formato:	info:eu-repo/semantics/article
Enlaces:	Technical teaching often requires the use of expensive laboratory materials which are frequently beyond the reach of many students. Students are also required to go to laboratories, which offer the appropriate facilities, according to a strict timetable. For these reasons,…
Fecha:	2008-06-09
Recurso:	RUA Docencia

Recurso libre

15.

Disassembly planning based on precedence relations among assemblies
Torres Medina, Fernando - Puente Méndez, Santiago Timoteo - Aracil Santonja, Rafael

Formato:	info:eu-repo/semantics/article
Enlaces:	An algorithm is presented that is based on a representation method for products, which lets us show, intuitively, the hierarchical relationships among components and/or assemblies of the product. This paper presents an algorithm for establishing a partial non-destructive disassembly sequence…
Fecha:	2008-08-01
Recurso:	RUA Docencia

Recurso libre

16.

Saturation in linear optimization
Goberna Torrent, Miguel Ángel - Jornet Pla, Valentín - Molina Vila, María Dolores

Formato:	info:eu-repo/semantics/article
Enlaces:	In a solvable linear optimization problem, a constraint is saturated if it is binding at a certain optimal solution and it is weakly saturated if it is binding at a proper subset of the optimal set. Nonsaturation and weak saturation…
Fecha:	2008-11-06
Recurso:	RUA Docencia

Recurso libre

17.

Three approaches to calculating the velocity profile of a laminar incompressible fluid flow in a hollow tube
Neipp López, Cristian - Hernández Prados, Antonio - Beléndez Vázquez, Tarsicio - Rodes Roca, José Joaquín - Beléndez Vázquez, Augusto

Formato:	info:eu-repo/semantics/article
Enlaces:	We present three ways of treating the problem of fluid flow in a hollow cylinder. One method involves a differential equation, and the other two involve more physical insight. We discuss the relative advantages of each method., The following article…
Fecha:	2009-01-26
Recurso:	RUA Docencia

Recurso libre

18.

Cables under concentrated loads: a laboratory project for an engineering mechanics course
Beléndez Vázquez, Tarsicio - Neipp López, Cristian - Beléndez Vázquez, Augusto

Formato:	info:eu-repo/semantics/article
Enlaces:	Cables are one of the common structures studied in a first-year engineering mechanics course (statics), since the flexible cable is one of the usual methods of supporting loads. For example, the suspension bridge has been used for many centuries and…
Fecha:	2009-01-27
Recurso:	RUA Docencia

Recurso libre

19.

Quality tools and techniques: are they necessary for quality management?
Tarí Guilló, Juan José - Sabater Sempere, Vicente

Formato:	info:eu-repo/semantics/article
Enlaces:	Total quality management (TQM) has been developed around a number of critical factors. However, TQM is much more than a number of critical factors; it also includes other components, such as tools and techniques for quality improvement. In this paper,…
Fecha:	2009-11-11
Recurso:	RUA Docencia

Recurso libre

20.

Translation of pronominal anaphora between English and Spanish: discrepancies and evaluation
Peral Cortés, Jesús - Ferrández Rodríguez, Antonio

Formato:	info:eu-repo/semantics/article
Enlaces:	This paper evaluates the different tasks carried out in the translation of pronominal anaphora in a machine translation (MT) system. The MT interlingua approach named AGIR (Anaphora Generation with an Interlingua Representation) improves upon other proposals presented to date because…
Fecha:	2008-03-13
Recurso:	RUA Docencia

Recurso libre

21.

Treatment of EVA with corona discharge to improve its adhesion to polychloroprene adhesive
Martínez García, Asunción - Sánchez Reche, Ana - Gisbert Soler, Santiago - Cepeda Jiménez, Carmen María - Torregrosa Maciá, Rosa - Martín Martínez, José Miguel

Formato:	info:eu-repo/semantics/article
Enlaces:	Ethylene vinyl acetate (EVA) material containing 20 wt% vinyl acetate (EVA20) was treated with corona discharge to improve its adhesion to polychloroprene adhesive. Several experimental variables in the corona discharge treatment of EVA20 were considered: corona energy, type of electrode,…
Fecha:	2007-10-31
Recurso:	RUA Docencia

Recurso libre

22.

Automatic PC disassembly for component recovery
Torres Medina, Fernando - Gil Vázquez, Pablo - Puente Méndez, Santiago Timoteo - Pomares Baeza, Jorge - Aracil Santonja, Rafael

Formato:	info:eu-repo/semantics/article
Enlaces:	In this article, a personal computer disassembly cell is presented. With this cell, a certain degree of automatism is afforded for the non-destructive disassembly process and for the recycling of these kinds of mass-produced electronic products. Each component of the…
Fecha:	2008-08-01
Recurso:	RUA Docencia

Recurso libre

23.

Reconfigurable computing for tool-path computation
Jimeno Morenilla, Antonio - Cuenca Asensi, Sergio

Formato:	info:eu-repo/semantics/article
Enlaces:	Tool path generation is one of the most complex problems in Computer Aided Manufacturing. Although some efficient strategies have been developed to solve it, most of them are only useful for 3 and 5 axis standard machining. The algorithm called…
Fecha:	2008-10-15
Recurso:	RUA Docencia

Recurso libre

24.

Description of two new species of Enclisis (Hymenoptera: Ichneumonidae) and support for the secretory role of tyloids in ichneumonid males
Bordera Sanjuán, Santiago - Hernández Rodríguez, Estefanía

Formato:	info:eu-repo/semantics/article
Enlaces:	Two new species of Enclisis Townes, 1970 from Spain are described and illustrated: E. dichroma sp. n. and E. schwarzi sp. n. The new species are distinguished from the closest species E. infernator and E. ornaticeps by head and leg…
Fecha:	2009-02-13
Recurso:	RUA Docencia

Recurso libre

25.

Numerical and experimental analysis of a cantilever beam: a laboratory project to introduce geometric nonlinearity in mechanics of materials
Beléndez Vázquez, Tarsicio - Neipp López, Cristian - Beléndez Vázquez, Augusto

Formato:	info:eu-repo/semantics/article
Enlaces:	The classical problem of deflection of a cantilever beam of linear elastic material, under the action of an uniformly distributed load along its length (its own weight) and an external vertical concentrated load at the free end, is experimentally and…
Fecha:	2009-01-23
Recurso:	RUA Docencia

Recurso libre

26.

Thick phase holographic gratings recorded on BB-640 and PFG-01 silver halide materials
Neipp López, Cristian - Márquez Ruiz, Andrés - Pascual Villalobos, Inmaculada - Beléndez Vázquez, Augusto

Formato:	info:eu-repo/semantics/article
Enlaces:	Photographic emulsions are still widely used to record holographic optical elements. In particular, if high diffraction efficiencies are needed, phase volume holograms are preferably recorded on these emulsions. Two particular techniques producing high-quality volume phase holograms are fixation-free rehalogenating bleaching…
Fecha:	2009-01-30
Recurso:	RUA Docencia

Recurso libre

27.

Susceptibility of multidrug resistance tumor cells to apoptosis induction by histone deacetylase inhibitors
Castro-Galache, María D. - Ferragut, José A. - Barberá, Víctor Manuel - Martín-Orozco, Elena - González-Ros, José M. - García-Morales, Pilar - Saceda, Miguel

Formato:	info:eu-repo/semantics/article
Enlaces:	The main goal of our study has been to analyze the efficiency of new anticancer drugs, specifically histone deacetylase inhibitors, in tumor cells bearing a multidrug resistance phenotype. We report that the histone deacetylase inhibitors, Trichostatin A and Suberoylanilide Hydroxamic…
Fecha:	2012-01-10
Recurso:	RUA Docencia

Recurso libre

28.

Taxonomy of European Eristalinus (Diptera: Syrphidae) based on larval morphology and molecular data
Pérez Bañón, Celeste - Rojo Velasco, Santos - Ståhls, Gunilla - Marcos García, María Ángeles

Formato:	info:eu-repo/semantics/article
Enlaces:	The taxonomy of European Eristalinus syrphid flies is reviewed. New data on their life histories, biological notes and a key to species using pupal characters are provided. The larvae and puparia of Eristalinus taeniops (Wiedemann, 1818) and Eristalinus megacephalus (Rossi,…
Fecha:	2009-02-13
Recurso:	RUA Docencia

Recurso libre

29.

First-harmonic diffusion-based model applied to a polyvinyl-alcohol–acrylamide-based photopolymer
Neipp López, Cristian - Gallego Rico, Sergi - Ortuño Sánchez, Manuel - Márquez Ruiz, Andrés - Álvarez López, Mariela Lázara - Beléndez Vázquez, Augusto - Pascual Villalobos, Inmaculada

Formato:	info:eu-repo/semantics/article
Enlaces:	The photopolymerization diffusion models give accurate comprehension of the mechanism of hologram formation inside photopolymer materials. Although several models have been proposed, these models share the common assumption that there is an interplay between the processes of monomer polymerization and…
Fecha:	2009-01-22
Recurso:	RUA Docencia

Recurso libre

30.

Comparative study of bleaches applied to BB-640 plates
Neipp López, Cristian - Condeza, Shirley - Campos, Ana María - Pascual Villalobos, Inmaculada - Beléndez Vázquez, Augusto

Formato:	info:eu-repo/semantics/article
Enlaces:	The use of bleaching techniques is perhaps one of the most popular methods of creating phase holograms from holographic emulsions. In this paper we will study the influence of the different experimental conditions on the refractive index modulation created inside…
Fecha:	2009-01-30
Recurso:	RUA Docencia

Recurso libre

31.

Low spatial frequency characterization of holographic recording materials applied to correlation
Márquez Ruiz, Andrés - Neipp López, Cristian - Beléndez Vázquez, Augusto - Campos Coloma, Juan - Yzuel Giménez, María Josefa - Fimia Gil, Antonio

Formato:	info:eu-repo/semantics/article
Enlaces:	Accurate recording of computer-generated holograms (CGH) on a phase material is not a trivial task. The range of available phase materials is large, and their suitability depends on the fabrication technique chosen to produce the hologram. We are particularly interested…
Fecha:	2009-01-30
Recurso:	RUA Docencia

Recurso libre

32.

Olivocochlear efferent innervation of the organ of Corti in hypothyroid rats
Cantos Coll, Raquel - López García, Dolores Estilita - Merchán Cifuentes, Jaime - Rueda Puente, Joaquín

Formato:	info:eu-repo/semantics/article
Enlaces:	Congenital hypothyroidism induces developmental abnormalities in the auditory receptor, causing deafness due to a poor development of the outer hair cells (OHCs) and a lack of synaptogenesis between these cells and the olivocochlear axons. This efferent innervation is formed by…
Fecha:	2009-03-26
Recurso:	RUA Docencia

Recurso libre

33.

Pyrolysis and combustion kinetics and emissions of waste lube oils
Gómez-Rico Núñez de Arenas, María Francisca - Martín Gullón, Ignacio - Fullana Font, Andrés - Conesa Ferrer, Juan Antonio - Font Montesinos, Rafael

Formato:	info:eu-repo/semantics/article
Enlaces:	The present work studies first the kinetics of the global primary thermal decomposition of raw waste lubricant oils in helium atmosphere conditions and with different proportions of helium:oxygen by TGA. In addition, pyrolysis and partial oxidation runs were carried out…
Fecha:	2010-11-11
Recurso:	RUA Docencia