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Search Results: 1 - 10 of 121576 matches for " álvaro Rogelio T. "
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Obtención de máxima transferencia de potencia a una carga eléctrica por métodos de optimización
Fery P. Rodríguez M.,álvaro Rogelio T.,Harold Vacca G.
Visión Electrónica , 2012,
Abstract: El presente artículo presenta el análisis de datos en una carga eléctrica para obtener la optimización del valor de la carga eléctrica que permita la máxima transferencia de potencia de un circuito a la carga, modelado mediante un equivalente de thévenin. Para el estudio se tomaron datos experimentales en un circuito para el cual la carga varía mediante un potenciómetro que se instala a un circuito considerado como caja negra, con lo que se encontraron unos datos experimentales de potencia en la carga en función de la resistencia de carga. Al tomar datos experimentales se tiene presente ubicar una condición de optimización de tres puntos, es decir, una concavidad encerrada por tres datos experimentales, para empezar un método de optimización por sección dorada o por método polinomial de Powell.
Paul Dirac y la religión
Rogelio T. Pontón
Invenio , 2006,
Abstract:
Praxeología y Ley de Rendimientos Decrecientes
Rogelio T. Pontón
Invenio , 2010,
Abstract:
Recordando a un economista cristiano: Wilhelm R pke
Rogelio T. Pontón
Invenio , 2000,
Abstract:
Azar y finalidad
Rogelio T. Pontón
Invenio , 2001,
Abstract:
Nonunion of the humeral shaft successfully treated with teriparatide [rh (1-34) PTH]  [PDF]
ángel Oteo-álvaro, María T. Marín
Case Reports in Clinical Medicine (CRCM) , 2013, DOI: 10.4236/crcm.2013.21004
Abstract:

We reported a case of atrophic nonunion after humeral shaft fracture in a patient with severe psychiatric disorders that advised against hospital admission and surgery. He was treated with teriparatide (recombinant human 1-34 parathyroid hormon) [rh (1-34) PTH] in daily subcutaneous injections. After 4 months of treatment, healing of nonunion, associated to clinical improvement and functional recovery of the patient, was observed. No other intervention was required, and no side effects attributable to the drug occurred.

Abundance, distribution and feeding patterns of a temperate reef fish in subtidal environments of the Chilean coast: the importance of understory algal turf
PALMA,áLVARO T.; OJEDA,F. PATRICIO;
Revista chilena de historia natural , 2002, DOI: 10.4067/S0716-078X2002000100018
Abstract: cheilodactylus variegatus is an abundant carnivorous demersal reef fish that lives in the shallow subtidal of the north-central chilean coast. characteristically, these environments are dominated by kelp forests of lessonia trabeculata. this species preys on a great variety of benthic invertebrates, and shows particularly high consumption rates on amphipod crustaceans. in our study, two widely separated populations of c. variegatus were considered (central and northern chile). individuals that form part of these populations show considerable differences in their distribution, abundance and trophic behavior. in the northern zone, the species is abundant and both juveniles and adults are distributed along the whole bathymetric gradient. this contrasts with populations found in central chile, which are more sparse and lack juveniles. the distribution and abundance patterns appear to be influenced mainly by the great abundance of diverse understory macroalgae in the northern subtidal, which harbors a large number of invertebrates, especially amphipods. in contrast, the understory algal abundance of the central zone is much lower, and does not show a direct relationship with the lesser abundance of amphipods. in general, c. variegatus maintains a high consumption rate on amphipods throughout its ontogeny but it includes several other prey items in later ontogenetic stages. the different understory algal assemblages, and their associated fauna, are likely to be the main factors influencing the patterns of abundance and distribution observed between these two geographically distinct fish populations
Crypsis in early benthic phases of Brachyuran Decapod Crustaceans in central Chile
PALMA,áLVARO T.; ORREGO,CAEL; ARRIAGADA,MAURICIO;
Revista chilena de historia natural , 2003, DOI: 10.4067/S0716-078X2003000200002
Abstract: although common and in some cases of commercial value, little is known about the mechanisms and processes that affect the distribution and abundance of many species of decapod crustaceans, particularly in chile. all of these species have planktonic larvae that must settle and recruit before becoming part of the adult segments of their populations. for several of these species we have detected the presence of a variety of color morphs in newly settled individuals. the existence of these morphs in chilean species is comparable with those observed in other latitudes (e.g., coast of the gulf of maine). on the other hand, it is characteristic that the occurrence of these patterns only appears during the early juvenile stages and that after reaching a certain size it disappears, with adults being typically monochromatic. the expression of this pattern in the chilean subtidal seems to be more pronounced in detritivorous species than in carnivorous ones. we propose that the existence of these kind of phenotypic attributes, apparently generalized in brachyuran decapods, could play an important role both from an ecological as well as evolutionary point of view
Abundance, distribution and feeding patterns of a temperate reef fish in subtidal environments of the Chilean coast: the importance of understory algal turf Abundancia, distribución y patrones alimentarios de un pez de arrecifes templados en ambientes submareales de la costa de Chile: la importancia de la capa de algas del subdosel
áLVARO T. PALMA,F. PATRICIO OJEDA
Revista chilena de historia natural , 2002,
Abstract: Cheilodactylus variegatus is an abundant carnivorous demersal reef fish that lives in the shallow subtidal of the north-central Chilean coast. Characteristically, these environments are dominated by kelp forests of Lessonia trabeculata. This species preys on a great variety of benthic invertebrates, and shows particularly high consumption rates on amphipod crustaceans. In our study, two widely separated populations of C. variegatus were considered (central and northern Chile). Individuals that form part of these populations show considerable differences in their distribution, abundance and trophic behavior. In the northern zone, the species is abundant and both juveniles and adults are distributed along the whole bathymetric gradient. This contrasts with populations found in central Chile, which are more sparse and lack juveniles. The distribution and abundance patterns appear to be influenced mainly by the great abundance of diverse understory macroalgae in the northern subtidal, which harbors a large number of invertebrates, especially amphipods. In contrast, the understory algal abundance of the central zone is much lower, and does not show a direct relationship with the lesser abundance of amphipods. In general, C. variegatus maintains a high consumption rate on amphipods throughout its ontogeny but it includes several other prey items in later ontogenetic stages. The different understory algal assemblages, and their associated fauna, are likely to be the main factors influencing the patterns of abundance and distribution observed between these two geographically distinct fish populations Cheilodactylus variegatus es un pez demersal abundante que habita el submareal somero de la costa norte y central de Chile. Es característico de estos ambientes el estar dominados por praderas del alga Lessonia trabeculata. Esta especie incorpora en su dieta una variada gama de invertebrados bentónicos, mostrando una tasa particularmente alta de consumo de crustáceos anfípodos. En nuestro estudio, se consideró dos poblaciones ampliamente separadas de C. variegatus (centro y norte de Chile). Los individuos que integran estas poblaciones exhiben claras diferencias en su distribución, abundancia y comportamiento trófico. En la zona norte, la especie es abundante y tanto juveniles como adultos se distribuyen a lo largo de todo el gradiente batimétrico. Esto contrasta con las poblaciones de la zona central de Chile, las que están más dispersas y desprovistas de juveniles. El patrón de distribución y abundancia parece estar principalmente influenciado por la gran abundan
Crypsis in early benthic phases of Brachyuran Decapod Crustaceans in central Chile Cripsis en fases bentónicas tempranas de crustáceos decápodos braquiuros en Chile central
áLVARO T. PALMA,CAEL ORREGO,MAURICIO ARRIAGADA
Revista chilena de historia natural , 2003,
Abstract: Although common and in some cases of commercial value, little is known about the mechanisms and processes that affect the distribution and abundance of many species of decapod crustaceans, particularly in Chile. All of these species have planktonic larvae that must settle and recruit before becoming part of the adult segments of their populations. For several of these species we have detected the presence of a variety of color morphs in newly settled individuals. The existence of these morphs in Chilean species is comparable with those observed in other latitudes (e.g., coast of the Gulf of Maine). On the other hand, it is characteristic that the occurrence of these patterns only appears during the early juvenile stages and that after reaching a certain size it disappears, with adults being typically monochromatic. The expression of this pattern in the Chilean subtidal seems to be more pronounced in detritivorous species than in carnivorous ones. We propose that the existence of these kind of phenotypic attributes, apparently generalized in brachyuran decapods, could play an important role both from an ecological as well as evolutionary point of view Aunque comunes, y en algunos casos de valor comercial, poco es lo que se conoce acerca de los mecanismos y procesos que afectan la distribución y abundancia de muchas especies de crustáceos decápodos, particularmente en Chile. Todas estas especies poseen larvas planctónicas que deben asentarse y reclutar antes de pasar a formar parte de los segmentos adultos de sus poblaciones. En varias de estas especies hemos detectado la presencia de una variedad de morfos de coloración en individuos recién asentados. La existencia de dichos morfos en especies chilenas es comparable con aquellos observados en otras latitudes (e.g., costa del Golfo de Maine). Por otro lado, es característica la aparición de estos patrones solo durante los estadíos juveniles tempranos y, al alcanzar cierto tama o, estos desaparecen, siendo los adultos típicamente monocromáticos. La expresión de este patrón en el submareal chileno parece ser más pronunciada en las especies detritívoras que en las carnívoras. Proponemos que la existencia de este tipo de atributos fenotípicos, aparentemente generalizado en decápodos braquiuros, podría jugar un rol importante, tanto desde un punto de vista ecológico como evolutivo
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