Sample records for FORMAS DE ONDAS (wave forms)
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1

EFECTO DE LAS FORMAS DE ONDAS DE CORRIENTE PULSANTE EN LA ELECTRODEPOSITACIÓN DE NANOCRISTALES/ EFFECT OF PULSE CURRENT WAVEFORMS IN NANOCRYSTALLYNE ELECTRODEPOSITION

MOLINA, JAROL; HOYOS, BIBIAN
2009-06-01

Resumen en español Se desarrolló un modelo matemático para establecer el efecto que tiene la forma de las ondas de corriente pulsante en el tamaño y dureza de nanocristales electrodepositados. El modelo relaciona de forma directa las variables típicas de las ondas (frecuencia, ciclo de trabajo y corriente pico) con la dureza de los depósitos generados mediante corriente continua y con cuatro tipos de ondas de corriente pulsante: rectangular, rampa ascendente, rampa descendente y triang (mas) ular. Se evaluaron los resultados del modelo para ciclos de trabajo de 20 y 80%, con frecuencias de 50 y 150 Hz y corrientes pico de 4 y 8 kA/m². El modelo predice que pequeños aumentos en el sobrepotencial de concentración incrementan significativamente la velocidad de nucleación, disminuyen el crecimiento de los nanocristales y generan un aumento en la dureza. El aumento del ciclo de trabajo y la frecuencia de las ondas produce un comportamiento cada vez más cercano al producido por la corriente continua, con una disminución en la dureza de los nanocristales. Cualquier modificación en las variables de las ondas, que tenga como consecuencia el incremento de la corriente pico, produce valores de dureza más altos. Resumen en inglés A mathematical model has been developed for describing the effect of pulse current wave forms on size and hardness of electroplated nanocrystals. The model relates in a direct form the typical wave variables (frequency, duty cycle and peak current) with harness of generated deposits by means of direct current and by four pulse current wave forms: rectangular, ramp up, ramp down and triangular. The results of the model were evaluated for duty cycles of 20 and 80%, with fre (mas) quencies of 50 and 150 Hz and peak currents of 4 and 8 kA/m².The model predicts that small increases in the concentration overpotential drives to increase the nucleation rate significantly, diminishing the growth of the nanocrystals and generating a hardness increase. The increase of the duty cycle and the wave’s frequency produces a behavior increasingly close to that produced by direct current, with a diminution in the nanocrystals hardness. Any modification in the waveform variables that increases the peak current produces higher hardness values.

Scientific Electronic Library Online (Spanish)

2

Doppler de arteria umbilical con flujo reverso intermitente en embarazo gemelar monocorial biamniótico con RCIU selectivo: reporte de un caso y revisión de la literatura/ A case report and review of the literature regarding umbilical artery Doppler with intermittent reversed flow in monochorionic biamniotic twin pregnancy with selective IUGR

Gálvez, María L; Rodríguez, Nadiezdha; Gómez, Iván; Puccini, Giuliana; Sarmiento, Andrés; Quijano, Fabio
2008-06-01

Resumen en español Objetivo: revisar la literatura existente acerca del retardo de crecimiento intrauterino discordante en el embarazo gemelar, en cuanto a las características de doppler de la arteria umbilical, la fisiopatología del patrón que representan sus ondas y las implicaciones como factor pronóstico de bienestar fetal y manejo. Se presenta un caso clínico de paciente con estudio de doppler reverso intermitente de arteria umbilical en feto con restricción de crecimiento intrau (mas) terino (RCIU) discordante de gestación gemelar monocorial biamniótico. Discusión: la literatura revisada mostró que el embarazo gemelar monocorial tiene formas únicas de relaciones vasculares entre sus fetos, que hacen que se dibujen ondas doppler específicas para la arteria umbilical que tienen al parecer una correlación clínica directa con el desenlace de estos embarazos; sin embargo, falta evidencia suficiente que soporte estos hallazgos para poder, de manera concreta, definir patrones de doppler de la arteria umbilical y dar un pronóstico certero de cada uno. Resumen en inglés Objective: this article presents a review of the existing literature on selective intrauterine growth restriction (sIUGR) in monochorionic biamniotic twin pregnancies, umbilical artery Doppler’s characteristics, the pathophysiology of its typical wave forms and its implications as a prognostic factor of foetal well-being and management. A case of intermittently reversed Doppler of the umbilical artery is presented in a monochorionic biamniotic twin pregnancy discordant g (mas) rowth restricted foetus. Discussion: the literature review revealed that monochorionic pregnancies have different vascular connections between the foetuses, thereby making umbilical artery Doppler waves reveal a clear representation of communication patterns. There is an important correlation between Doppler wave type, clinical evolution and pregnancy outcome; however, insufficient evidence was produced here to support such findings and establish definitive umbilical artery Doppler patterns as a prognostic factor.

Scientific Electronic Library Online (Spanish)

3

Terapia fotodinámica: aplicación en dos pacientes con metástasis endobronquiales de adenocarcinoma extrapulmonar/ PHOTODYNAMIC THERAPY: APPLICATION IN TWO PATIENTS WITH EXTRAPULMONARY ADENOCARCINOMA AND ENDOBRONCHIAL METASTASES

CAVIEDES S, IVÁN; BADÍNEZ V, LEONARDO; CÓRDOVA B, ANDRÉS; GOSET P, KAREN; ZELADA S, GABRIEL
2003-01-01

Resumen en español La terapia fotodinámica consiste en la administración de un fármaco fotosensibilizante (generalmente derivado de la hematoporfirina), que es ávida y especialmente captado por las células tumorales. Posteriormente se aplica una fotoestimulación con láser con una potencia y una longitud de onda previamente establecidas por medio de una broncoscopía flexible. Con este método se generan moléculas con oxígeno en estado excitado de singlete, produciendo una serie de (mas) cambios estructurales que llevan a la destrucción celular²,³. Basándose en este principio se ha utilizado esta terapia en múltiples parénquimas: piel, esófago, vejiga, retina y árbol bronquial entre otros. En relación a este último, la evidencia publicada favorece a esta técnica por inducir períodos prolongados de permeabilizacion de tumores bronquiales obstructivos, en cánceres no de células pequeñas y metástasis endobronquiales de cánceres primarios de otro origen4. En esta primera experiencia nacional presentamos dos pacientes en etapas avanzadas de adenocarcinoma extrapulmonar con metastasis endobronquial. En ambas pacientes (la primera con un cáncer de colon y la segunda con un cáncer de mama), hemos conseguido permeabilización bronquial satisfactoria y prolongada del árbol bronquial derecho, por períodos de 5 y 3 meses respectivamente. El inicio de esta terapia en nuestro país ha continuado con otras aplicaciones exitosas realizadas por nuestro grupo en esófago y en piel, creando un área de trabajo y estudio en este campo. Revisamos además su fundamento teórico y su forma de aplicación Resumen en inglés Photodynamic therapy is based on the iv administration of a photosensibilizant drug (usually an hematoporphyrin derivative). This complex is intensively uptaken by the tumoral cells. Later, a laser photostimulation whose potency and wave length has been pre established, is applied through a flexible bronchoscopy. Using this method, singlet state excited oxygen molecules are generated, producing a series of structural changes that lead to cell destruction. Based on this pr (mas) inciple, this therapy has been used in multiple parenchymas: skin, esophagus, bladder, retina, bronchial tree and so on. In relation to this last parenchyma, the published evidence supports this technique because it induces long permeabilization periods of obstructive bronchial tumours in non-small cells cancers and in endobronchial metastases of non-pulmonary primary cancer. In this first national experience, we present two pacients with an advanced extrapulmonary adenocarcinoma with endobronchial metastases. In both (the first one with colon cancer and the second with breast cancer), we have achieved a satisfactory and continued bronchial permeabilization of the right bronchial tree for 5 and 3 months respectively. The beginning of this therapy in our country has continued with other successful applications done by our team in esophagus and skin, creating a working and studying area on this field. In this paper we also reviewed its theorical base and application forms

Scientific Electronic Library Online (Spanish)

4

p53-Independent checkpoint controls in a plant cell model

Pelayo, Helvia R.; Pincheira, Juana; Giménez-Abián, Juan F.; Clarke, Duncan J.; Torre, Consuelo de la
2004-09-01

Digital.CSIC (Spain)

5

Water Vapor around Sgr B2

Cernicharo, José; Goicoechea, Javier R.; Pardo Carrión, Juan Ramón; Asensio Ramos, Andrés
2006-01-10

Digital.CSIC (Spain)

6

Warm Water Vapor around Sagittarius B2

Cernicharo, José; Goicoechea, Javier R.; Pardo Carrión, Juan Ramón; Asensio Ramos, Andrés
2006-05-10

Digital.CSIC (Spain)

7

Vortex Rossby waves in mesoscale dipoles

Rodríguez-Marroyo, Rocío; Viúdez, Álvaro
2009-10-01

Digital.CSIC (Spain)

8

Tsunami deposits related to flank collapse in oceanic volcanoes: The Agaete Valley evidence, Gran Canaria, Canary Islands

Pérez Torrado, F. J.; Paris, R.; Cabrera, María C.; Schneider, Jean-Luc; Wassmer, Patrick; Carracedo, Juan Carlos; Rodríguez Santana, Ángel; Santana, Francisco
2006-02-03

Digital.CSIC (Spain)

10

Thin film bulk acoustic wave resonator and method for performing heterogeneous integration of the same with complementary -metal-oxide- semiconductor integrated circuit

Campanella Pineda, Humberto; Esteve i Tintó, Jaume; Cabruja Casas, Enric; Montserrat Martí, José; Teres Teres, Lluis; Carmona Flores, Manuel
2008-08-28

Digital.CSIC (Spain)

12

The slowly expanding envelope of CRL618 probed with HC3N rotational ladders

Pardo Carrión, Juan Ramón; Cernicharo, José; Goicoechea, Javier R.; Phillips, Thomas G.
2004-07-09

Digital.CSIC (Spain)

14
15

Study of the pd -> pdη reaction

Upadhyay, N. J.; Khemchandani, Kanchan P.; Jain, B. K.; Kelkar, N. G.
2007-05-14

Digital.CSIC (Spain)

16

Strangeness-changing scalar form factors

Jamin, Matthias; Oller, José Antonio; Pich, Antonio
2002-02-04

Digital.CSIC (Spain)

17

Spectroscopy of self-assembled quantum rings

Warburton, Richard J.; Urbaszek, B.; McGhee, E. J.; Schulhauser, C.; Högele, A.; Karrai, Khaled; Govorov, Alexander O.; Barker, J. A.; Gerardot, B. D.; Petroff, Pierre M.; García, Jorge M.
2002-01-01

Digital.CSIC (Spain)

18

Spectral distribution for the decay tau -> neutrino_tau K pion

Jamin, Matthias; Pich, Antonio; Portolés, Jorge
2006-01-01

Digital.CSIC (Spain)

19

Spectral analysis of earth tides

Sukhwani, P. K.; Vieira, Ricardo
1978-01-01

Digital.CSIC (Spain)

20

Sedimentary processes in the Wilkes Land margin: a record of the Cenozoic East Antarctic Ice Sheet evolution

Donda, F.; Brancolini, G.; O'Brien, P.E.; De Santis, L.; Escutia, Carlota
2007-01-01

Digital.CSIC (Spain)

21

Second- and higher-order perturbations of a spherical spacetime

Brizuela, David; Martín-García, José María; Mena Marugán, Guillermo A.
2006-08-30

Digital.CSIC (Spain)

22

Search for anions in molecular sources: C4H- detection in L1527

Agúndez, Marcelino; Cernicharo, José; Guélin, Michel; Gerin, M.; McCarthy, M. C.; Thaddeus, P.
2007-12-07

Digital.CSIC (Spain)

23

Quantum correlations close to a square pattern forming instability

Hoyuelos, Miguel; Oppo, Gian-Luca; Colet, Pere; San Miguel, Maxi
2003-03-01

Digital.CSIC (Spain)

24

Polarization patterns and vectorial defects in type-II optical parametric oscillators

Santagiustina, Marco; Hernández-García, Emilio; San Miguel, Maxi; Scroggie, Andrew J.; Oppo, Gian-Luca
2003-02-13

Digital.CSIC (Spain)

25

Physical oceanography of the Western Iberia ecosystem: Latest views and challenges

Relvas, Paulo; Barton, Eric D.; Dubert, Jesús; Oliveira, Paulo B.; Peliz, Álvaro; Da Silva, J. C. B.; Santos, A. Miguel P.
2007-05-17

Digital.CSIC (Spain)

26

Photodetachment spectrum of OHF-: Three-dimensional study of the heavy–light–heavy resonances

González-Sánchez, Lola; Gómez Carrasco, Susana; Aguado, Alfredo; Paniagua, Miguel; Hernández, M. Luz; Alvariño, José M.; Roncero, Octavio
2004-07-01

Digital.CSIC (Spain)

27

Patrones multimodales estables con simetría pentámera: el caso de los Crinoideos Rhodocrinítidos

Torres Herranz, Manuel; Gil Cid, Dolores; Domínguez Alonso, Patricio
1999-01-01

Digital.CSIC (Spain)

28

Parity-violating elastic electron scattering and nuclear structure

Moreno, Óscar; Moya de Guerra, Elvira; Sarriguren, Pedro; Udias, J.M.
2010-04-08

Digital.CSIC (Spain)

30

On the geometrical design of segmented annular arrays

Martínez Graullera, Óscar; Godoy, Gregorio; Parrilla Romero, Montserrat; Ibáñez Rodríguez, Alberto; Gómez-Ullate Alvear, Luis
2008-01-01

Digital.CSIC (Spain)

32

Nuclear isospin mixing and elastic parity-violating electron scattering

Moreno, Oscar; Sarriguren, Pedro; Moya de Guerra, Elvira; Udias, J.M.; Donnelly, T.W.; Sick, I.
2009-09-15

Digital.CSIC (Spain)

33

New results on the halo structure of B-8

Smedberg, M. H.; Baumann, T.; Aumann, T.; Axelsson, L.; Bergmann, U.; García Borge, María José; Cortina-Gil, D.; Fraile, Luis M.; Geissel, H.; Grigorenko, L.; Hellström, M.; Ivanov, M.; Iwasa, N.; Janik, R.; Jonson, B.; Lenske, H.; Markenroth, K.; Münzenberg, G.; Nilsson, T.; Richter, A.; Riisager, K.; Scheidenberger, C.; Schrieder, G.; Schwab, W.; Simon, H.; Sitar, B.; Strmen, P.; Sümmerer, K.; Winkler, M.; Zhukov, M. V.
1999-04-15

Digital.CSIC (Spain)

34

Morphometric analysis and genetic implications of pro-deltaic sea-floor undulations in the northern Alboran Sea margin, western Mediterranean Basin

Fernández-Salas, L. M.; Lobo, F. J.; Sanz, J. L.; Díaz del Río, V.; García, M. C.; Moreno, I.
2007-09-06

Digital.CSIC (Spain)

35

Molecular survey of CRL618

Pardo Carrión, Juan Ramón; Cernicharo, José; Goicoechea, Javier R.; Guélin, Michel; Asensio Ramos, Andrés
2007-03-01

Digital.CSIC (Spain)

36

Molecular Line Survey of CRL 618 from 80 to 276 GHz and Complete Model

Pardo Carrión, Juan Ramón; Cernicharo, José; Goicoechea, Javier R.; Guélin, Michel; Asensio Ramos, Andrés
2007-05-20

Digital.CSIC (Spain)

37

Modelo Matemático de la Nucleación Electroquímica con Ondas de Corriente Pulsante/ Mathematical Model for the Electrochemical Nucleation with Pulse Current Waveforms

Molina, Jarol E; Hoyos, Bibian A
2007-01-01

Resumen en español Se presenta un modelo matemático para describir el sobrepotencial de concentración, la velocidad de nucleación y el tamaño de núcleos formados sobre sustratos metálicos, cuando se emplean cuatro tipos de ondas de corriente pulsante: rectangular, rampa ascendente, rampa descendente y triangular. Para el desarrollo del modelo, se considera que la etapa que controla el proceso es la difusión de especies en la capa limite. El modelo predice que, cuando se emplean ondas (mas) con igual corriente promedio e igual tiempo de aplicación, la rampa descendente produce tiempos de transición más cortos, con mayor aumento en el sobrepotencial de concentración, lo que lleva a mayores velocidades de nucleación con tamaños de núcleos más pequeños. Para el caso de ondas con igual corriente pico y promedio, las ondas rectangular y descendente presentan prácticamente el mismo tiempo de transición, con velocidades de nucleación y tamaño de los depósitos equivalentes. El modelo desarrollado, constituye una herramienta ágil y flexible para la determinación del tamaño y la velocidad de formación de núcleos de electrodepositos y, puede ser extendida para estudiar otro tipo de ondas de corriente Resumen en inglés A mathematical model has been established for the description of concentration overpotential, nucleation rate and nucleus size formed on metallic substrates when four types of pulse current waveforms are used: rectangular, ramp-down, ramp-up and triangular. The mathematical model was developed considering that the species diffusion in the limit layer is the rate determining step of the process. The model predicts that when using wave current with the same current average (mas) and the same time of application, the ramp-down current produces the shortest transition time, with the highest rise of overpotential concentration, this drives to high nucleation rates with small nucleus size. For the case of current wave forms with the same pick and average current, the rectangular and ramp-down waves show practically the same transition time, with equivalent nucleation rate and deposit size

Scientific Electronic Library Online (Spanish)

38

Localized structures in nonlinear optical cavities

Gomila, Damià; Colet, Pere; Matías, Manuel A.; San Miguel, Maxi; Oppo, Gian-Luca
2006-02-09

Digital.CSIC (Spain)

40

Lee region of Gran Canaria

Barton, Eric D.; Basterretxea, Gotzon; Flament, Pierre; Gay Mitchelson-Jacob, E.; Jones, Bethan; Arístegui, Javier; Herrera, Félix
2000-07-01

Digital.CSIC (Spain)

41

Laser ray-tracing method for optical testing

Navarro, Rafael; Moreno Barriuso, Esther
1999-07-01

Digital.CSIC (Spain)

43

Inflation, quantum fields, and CMB anisotropies

Agulló, Iván; Navarro-Salas, José; Olmo, Gonzalo J.; Parker, Leonard
2009-07-15

Digital.CSIC (Spain)

45

Geomorphology of the Galicia Bank Region (NW Iberian Peninsula)

Ercilla, Gemma; Somoza, Luis; Vázquez, Juan T.; Estrada, Ferrán; Casas, David; [ERGAP Project and Cruise Team]
2008-01-01

Digital.CSIC (Spain)

46

Geomorfología de la región del volcán Copahue y sus adyacencias (centro-oeste del Neuquén)/ Geomorphology of the Copahue Volcano region and vicinities (Central-western Neuquén)

González Díaz, E.F.
2005-03-01

Resumen en español Se expone un mapa temático y conclusiones estratigráficas sobre el Cuaternario tardío. Distintos procesos geomórficos confieren el carácter de compuesto a su paisaje. Predominan los exógenos (fluvial, glaciario y remoción en masa); uno es endógeno (volcanismo). Su historia comenzaría en el Plioceno con el volcán Hualcupén, siendo su remanente la Planicie Estructural y la Caldera homónimas. Una intervención climática en el Cuaternario reemplazó un previo cic (mas) lo fluvial por un subsecuente englazamiento del tipo alpino, cuyas características locales se diferenciaron de ese modelo, por la generación de una masa de hielo (ice-blister), de gran espesor (500-800 m) en el interior de la caldera, intermedia entre el centro de alimentación (volcán Copahue) y la zona de descarga. Esto influyó en el movimiento del hielo de sus glaciares de descarga y en aquellos vecinos y exteriores a la caldera, no sustentados por ese centro intermedio, los que a favor de difluencias glaciarias tuvieron aportes extras de hielo (glaciares de Hualcupén y Trocomán). Localmente, el englazamiento es un hito temporal para el análisis de su evolución geomórfica y la cronología relativa local del Cenozoico superior, al permitir diferenciar episodios volcánicos pre- y post-glaciarios. La distinción de importantes depósitos de deslizamientos y su reinterpretación geomórfica, descartó una propuesta previa de dos glaciaciones en el área. La profunda disección del tramo este del río Agrio resulta del ajuste de su perfil longitudinal a su nivel de base previo, cuya modificación aconteció luego de su endicamiento por la colada del Agrio y la consiguiente instalación de un nuevo nivel de base. La posterior superación del efímero obstáculo por erosión y consecuente profundización, dio lugar a la cascada del Agrio, un resalto estructural (knickpoint) que señala el límite aguas arriba alcanzado por la natural onda de rejuvenecimiento. Constituye un nivel de base temporario, que determina el límite de los contrastantes paisajes y perfiles transversales del valle de Trolope, aguas arriba y abajo del resalto. Resumen en inglés This thematic map describes the principal features of the landscape, a relative sequence of its geomorphic evolution, and arrives to important conclusions about its regional stratigraphy. The regional landscape is composed and polycyclic. The geoforms are related to different exogenous processes (glacial, fluvial and mass-wasting). An endogenous process (volcanism) formed the more distinctive features; a great tectonic-volcanic caldera and the preglacial Copahue stratovol (mas) cano. Some minor and youngest volcanic forms were formed during postglacial times. A previous fluvial cycle was replaced by glacial morphogenesis (valley glaciation) during the Quaternary, due a climatic intervention. A huge and very thick (500-800 m) ice-blister was lodged into the caldera. The ice-blister exceded the caldera´s edges forming several glacial diffluences and giving an important and additional supply to neighbouring glacial valleys (Hualcupén and Trocoman), out of to the depression. The Pleistocene glaciation shows two local cycles of volcanic eruptions: pre- and post-glacial. The origin of many local lakes was related to glacial exharation. Other lakes have different genesis: by blocking slide, crater-lake and glacial exharation associated with important structural weakness (Caviahue Lake related to the Trapa-Trapa lineament or Caviahue graben). During postglacial times important rock-avalanches occurred in the Hualcupén valley: the Cajón Chico and Compul rock-avalanches were related to seismic shocks. Previously, their accumulations were interpreted as terminal moraines of a second glaciation. A fluvial rejuvenation phase was the consequence of a blocking of Agrio River by the Agrio volcanic flows, during the Holocene. After that, the river eroded this obstacle restablishing its previous base level. The Agrio cascade represents the upstream present position of the consequent rejuvenation wave.

Scientific Electronic Library Online (Spanish)

48

Family of modified-contracted Schrödinger equations

Alcoba, Diego Ricardo; Valdemoro, Carmela
2001-11-13

Digital.CSIC (Spain)

51

Estructuras de deformación (¿sismitas?) en la Formación Río Negro, provincia de Río Negro, Argentina

Schillizzi, Roberto; Luna, Liliana; Falco, Juan Ignacio
2010-07-01

Resumen en español A Las estructuras de deformación (ED) en sedimentos blandos comprenden las alteraciones que se producen casi simultáneamente con la sedimentación. Estos procesos se hallan en relación directa con las características internas de los materiales sedimentarios y de los factores externos que actúan sobre ellos. Sus resultados incluyen deformaciones como inyecciones, fracturas, volcanes y laminaciones convolutas que afectan total o parcialmente la estratificación. Los se (mas) dimentos blandos deformados por sismos se incluyen bajo la denominación general de sismitas (seismites). Como objetivo de esta investigación se plantea reconocer, por primera vez, estructuras de deformación ubicadas en la Formación Río Negro presentes en el sector norte del Golfo San Matías, en inmediaciones del Faro Río Negro. La metodología empleada consistió en el reconocimiento y descripción de las estructuras, para lo cual se extrajeron muestras para determinar granulometría, mineralogía y contenido de materia orgánica. Se fotografiaron los distintos sectores con deformaciones con el fin de establecer modelos comparativos. El sector estudiado, de 4 km de extensión, se ubica entre el faro de Río Negro y el inicio del Banco Verde y morfológicamente corresponde a un frente acantilado con orientación ENE-OSO. En él se determinaron las siguientes ED: a- de carga simple, pseudonódulos contiguos y aislados, y estructuras complejas; b- de escape de fluidos y c- estructuras de deslizamiento basal y por presión dirigida. El origen de las deformaciones se debe a las características de las sedimentitas y a los procesos que las afectan tales como los efectos por carga, escapes de fluidos y las presiones dirigidas. Como origen de estos procesos se señalan: la presión de la columna litológica, las olas de tormentas y los terremotos. Por los rasgos hallados las deformaciones del litoral rionegrino tendrían un origen sísmico, proceso ocurrido en un único evento durante el ciclo Andino cuyos inicios se fijan hace aproximadamente 45 Ma. Por otra parte sus techos y bases no se hallan asociados a otros procesos de deformación y sus espesores no exceden el metro de potencia. Además se hallan acotadas a la zona de transición entre los miembros medio y superior de la Formación Río Negro descansando en algunos casos sobre arcilitas y en otros sobre limolitas, originadas en un paleorelieve de interdunas. Resumen en inglés Soft-sediment deformation structures (SSD) are alterations produced almost simultaneously with sedimentation. They are directly related to internal characteristics of sedimentary materials as well as to external factors acting on them. Results derived from such alterations are evidenced as injections, fractures, volcanoes and convolute laminations, among other forms, affecting stratification either totally or partially. Soft-sediment deformation structures resulting from (mas) seisms are known as seismites. The present study aims at determining for the first time the presence of SSD structures in the Río Negro Formation, located in the northern area of San Matías Gulf, near Río Negro Lighthouse, Argentina (Fig. 1). To this end, structures were firstly identified and further described. Samples were subsequently collected for the determination of grain-size, mineralogy and organic matter content. Photographs of the different sectors evidencing deformations were taken in order to determine further comparative models. Morphology in the study area is associated to cliffs with vertical, fractured fronts and with an average height of 70 m in whose base torn-down blocks are accumulated. The geological structure of the study area is related to the Cuenca del Colorado and the Comarca Nordpatagónica, whose basement is mainly composed of Paleozoic and Mesozoic crystalline rocks. The sedimentary tertiary cover from the Miocene-Pliocene is represented by light-blue sandstones of the Río Negro Formation (Andreis, 1965). This unit was formed in an aeolian environment with intercalations of clay-silt shallow lagoons and a marine episode located in the mid area of the Río Negro Formation. At the top of the Río Negro Formation there are Pleistocene-Holocene sedimentites having a thickness of up to 5 m. Within the local structural framework of our study area there are fractures with a NE-SW and a NW-SE direction, which are related with fractures N55º, N90º and N350º azimuth located in the abrasion platform. According to Dzulinsky and Walton (1965), Lowe (1975), Brencley and Newall (1977), Clauss (1993), van Loon (2002), Owen (2003), Neuwerth et al. (2006), Alfaro et al. (2006), Montenat et al. (2007), among others (Table 1), and, taking into account the geometry of deformations, laboratory reconstructions and field observations from our study area, it can be concluded that the classifications of SSD structures tend to establish morphologic and genetic systematizations. The following characteristics were identified in our study area: limited deformations among stratigraphic horizons; a lateral continuity of SSD structures at considerable distances; and a confinement between non-deformed strata and its lithological association with psamitic-pelitic sediments. The study area, which is 4 km long and is located between Río Negro Lighthouse and the beginning of Banco Verde, is from the morphological point of view, a cliffed front with an ENE-WSW orientation. Different types of SSD structures were identified in this area. For example, from the morphological point of view and according to the loading mechanisms observed, simple-load structures (Fig. 2), attached and detached pseudonodules (Figs. 3, 4 and 5) and complex structures (Fig. 6) were identified. Furthermore, from the genetic point of view and according to the intrusion processes observed in soft sediments, water-scape structures (Fig. 7) and plate- or fountain-like deformations (Fig. 8) were found. From the genetic point of view, and based on the collapse and pressure mechanisms observed, basal slumping (Fig. 9) and directed-pressure structures (Fig. 11) were also found. The above-mentioned SSD structures were analyzed and interpreted following Strachan´s model (2002) (Fig. 10) and Laird´s model (1968) (Fig. 12). The origin of SSD structures depends on the characteristics of sedimentites and on the mechanisms that produce them. In the study area, the materials susceptible to deformation come from an interdune environment that is characterized by granulometric variations derived from the fluctuating and restrictive climatic conditions (Cojan and Thiry, 1992) that typify the Río Negro Formation. Fine-grained materials having low cohesion and poor sorting such as the sediments of deformed strata (Fig. 13) produced SSD structures as a result of high pore pressure and liquefaction effects (Tsuchida and Hayashi, 1971; Obermeier, 1996). Grain packing with a porous value as that allows intercommunication among grains and saturated material, is also crucial to the formation of SSD structures. The mineralogic content of deformed levels is composed of i) quartz, chalcedony, orthose, plagioclase, pyroxenes and biotite, opaques (magnetite and ilmenite, autigenic pyrite) in crystalline aggregates; ii) undetermined Fe oxides; and iii) colorless and light-brown unaltered volcanic glass shards, clays identified as smectite-illite interstratified and scarce kaolinite. Grains are mainly subangular and, to a lesser extent, sub-round and round. The surface of the majority of grains in the study area was found clean and with some marks. The percentage of CaCO3 was found to vary from 0.5 to 3% and that of total organic carbon (TOC) was found to reach 1.5%. Deformations may be produced as a result of load deformation mechanisms, fluid escape, basal slumping or pressure-directed displacements. Due to load deformation mechanisms, structures are linked to gravity-related movements occurring during the initial stages of deposition. For these deformations to occur, grain-size at the overlaying levels should be thicker than at the underlying levels, for example, sandstones rather than silstones or claystones. These deformations are related to water saturation at the deformed level (fluidization-liquefaction). Therefore, deformation mechanisms, which involve both expulsion and rotation of fragments as well as fluid escape, are characterized by the action of lithostatic pressure which produces movement (deformation) and by the action of the underlying sedimentary levels. Deformations may also result from a fluid escape mechanism, i.e., from a mechanism associated to i) the spatial arrangement of grains (packing), ii) their shape, iii) their tendency to inequigranularity, and iv) the communication among macro- and micro- pores as well as the high or low sinuosity connection among themselves (Net and Limarino, 2000). Further requirements for deformations to occur include particular thixotrophic conditions, especially the presence of colloids among grains. The rupture of unions of particles either by hitting or by shearing is, among others, a cause which produces an unbalance between hydrostatic pressure and lithostatic pressure. If the latter is altered, the energetic unbalance makes fine sediments flow among the weakly lithified sandstones whose extrusion will occur via both vertical and horizontal pore ducts (Lopez Gamundi, 1986; Clauss, 1993). Basal slumping produces deformations that are associated not only to soft sediments deposited in natural slopes but also to interbedded sand- and mud-levels. Layers tend to have a prismatic-shaped geometry whose materials are under ductile-to-fragile conditions, in which antique layers support younger ones. Once horizontality is affected, movement, which is marked by a rupture of the original slope, begins. The lower levels are expected to transport the upper ones without affecting the original succession of layers. At the delay of movement derived from the compressive effect of the displacement front, fluids extrude forming cones or cut dikes (Fig. 10). Several deformations of this type initiate movement as result of differences in the hydrostatic gradient (Strachan, 2002). Deformations may be also produced as a result of pressure-directed displacements which are conditioned by the compaction level, thickness and ability of materials to deform. Thus, deformations occur because the original level is saturated in water as a result of the ductile behavior of materials (Bracco et al., 2005). Laird (1968) claims that SSD structures should meet some of the following requirements to be considered of seismic origin: slightly curved strata walls and floors to follow the original stratification and interruption of continuity of the stratum that is marked by a scar in which the sedimentary fillings keep their characteristics both above and below stratification. There could be rotated sediment clasts below the discontinuity as a result of a thrust-induced drag of the upper sedimentary packing. These processes could be, in turn, triggered either by the charge or pressure of the lithologic column, storm waves and seismicity. Storm-wave impact may also produce deformation in soft sediments. Nonetheless, no high energy structures such as cross-beddings or tsunami-type chaotic sedimentation were observed in our study area. Noteworthingly, for stormwave-derived liquefaction to occur, waves should reach magnitudes higher than 6 m (Alfaro et al., 2002), this being a phenomenon that was not recorded in our study area. Taken together, findings from the present study indicate that SSD structures in our study area are seismic alterations that occurred in an event during the Andean cycle whose beginnings are traced approximately 45 My ago. The fact that i) both the roofs and bottoms of these structures are not associated to other processes of deformation, ii) their thickness does not exceed one meter, and iii) they are confined to a transitional area between the middle and top members of the Río Negro Formation, lying in some cases on claystones and in some other cases, on siltstones, originated in an interdune paleorelief, confirms their seismic origin.

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55

Electron-positron annihilation into Φf(0)(980) and clues for a new 1(--) resonance

Napsuciale, Mauro; Oset, Eulogi; Sasaki, Kenji; Vaquera-Araujo, Carlos A.
2007-10-15

Digital.CSIC (Spain)

56

Electromagnetic form-factors of odd-A rotational nuclei

Sarriguren, Pedro; Graca, E.; Sprung, D.W.L.; Moya de Guerra, Elvira; Berdichevsky, D.
1989-09-01

Digital.CSIC (Spain)

57
58

EL SURGIMIENTO DE LO TRÁGICO Y NUEVAS FORMAS DE INSURRECCIÓN SOCIAL/ TRAGIC UPRISING AND NEW FORMS OF SOCIAL INSURRECTION/ SURGIMENTO DA COISA TRÁGICA: AS NOVOS FORMAS DA EXPRESSÃO SOCIAL

Maffesoli, Michel; Agar Corbinos, Lorenzo
2002-01-01

Resumen en portugués No meio urbano manifesta-se uma insurreição latente com expressões múltiplas de formas cada vez mais variadas e imaginativas. A violência urbana apresenta-se como expressão física, ódio contra o instituído e contra o modelo de relações sociais e interpessoais vigentes. É necessário refletir sobre o impensável, sobre aquilo que julgávamos indecifrável desde o não-racional. Pensar o não-racional está muito distante de ser irracional. O grande fantasma da (mas) assepsia social pretendeu expulsar a sombra que corroe o corpo individual e coletivo. A análise, em termos de contrato social,cidadania e ideal democrático foi incapaz de explicar as explosões de paixão e emoções tribais. A pergunta que se apresenta é de como enfrentar esta realidade social em ebulição com as limitações normativas e morais Resumen en español En el medio urbano se manifiesta una insurrección latente y manifiesta, con expresiones múltiples y cada vez más variadas e imaginativas. La violencia se muestra con su expresión física y también con una expresión de odiosidad contra lo instituido y contra el tipo de relaciones sociales e interpersonales vigentes. Es necesario reflexionar sobre lo impensable, sobre aquello que creíamos impenetrable desde lo no-racional. Pensar el no-racional está muy lejos de ser (mas) irracional. El gran fantasma de la asepsia social ha pretendido expulsar la sombra que roe el cuerpo individual y colectivo. El análisis, en términos de contrato social, de ciudadanía, de ideal democrático, ha sido incapaz de explicar los estallidos de pasión y emociones tribales. La pregunta es cómo enfrentar esta realidad social en ebullición, con las limitaciones normativas y morales Resumen en inglés Urban areas are experiencing a latent rebellion, which is manifesting itself in numerous forms; each wave the culmination of increasing variety and imagination. Violence, a physical expression of this rebellion captures the hatred felt towards the establishment, in particular towards the prevailing social networks and societal relationships currently in force. It is therefore necessary to reflect upon the unthinkable, over that which we have considered unthinkable since t (mas) he non-rational: to think that the non-rational is far from being irrational. The spirit of this great social asepsis has sought to expel the darkness, which corrodes both the body of the individual and society as a whole. Analysis, in terms of social contract, citizenship, and a democratic ideal has been incapable of explaining the aforementioned detonation of tribal passion and emotion. The question that we now face is how must we confront this flammable reality within the bounds of normative ethics and morality

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59

Drifting instabilities of cavity solitons in vertical-cavity surface-emitting lasers with frequency-selective feedback

Paulau, P. V.; Gomila, D.; Colet, Pere; Matías, Manuel A.; Loiko, N. A.; Firth, W. J.
2009-08-12

Digital.CSIC (Spain)

60

Direct and inverse discrete Zernike transform

Navarro, Rafael; Arines Piferrer, Justo; Rivera, Ricardo
2009-12-01

Digital.CSIC (Spain)

62

Differential cross sections and product rotational polarization in A + BC reactions using wave packet methods: H+ D2 and Li + HF examples

Zanchet, Alexander; Roncero, Octavio; González Lezana, Tomás; Rodríguez-López, A.; Aguado, Alfredo; Sanz, Cristina; Gómez Carrasco, Susana
2009-08-01

Digital.CSIC (Spain)

63

Couplings in coupled channels versus wave functions: Application to the X(3872) resonance

Gamermann, Daniel; Nieves, Juan Miguel; Oset, Eulogi; Ruiz Arriola, E.
2010-01-28

Digital.CSIC (Spain)

64

Contourites in the Galicia bank (NW Iberian Atlantic)

Casas, David; Iglesias, Jorge; Vázquez, Juan T.; Somoza, Luis; León, Ricardo; Medialdea, Teresa; Juan, Carmen; García, Marga
2011-01-18

Digital.CSIC (Spain)

65

Collective rotational transverse current multipoles: even-even nuclei

Berdichevsky, D.; Sarriguren, Pedro; Moya de Guerra, Elvira; Nishimura, M.; Sprung, D.W.L.
1988-07-01

Digital.CSIC (Spain)

66

Charge and matter distributions and form factors of light, medium, and heavy neutron-rich nuclei

Antonov, A. N.; Kadrev, D. N.; Gaidarov, M. K.; Moya de Guerra, Elvira; Sarriguren, Pedro; Udias, J. M.; Lukyanov, V. K.; Zemlyanaya, E. V.; Krumova, G. Z.
2005-10-20

Digital.CSIC (Spain)

67

Cartografiando la dinámica sedimentaria de la región del Banco de Galicia

Ercilla, Gemma; Casas, David; Somoza, Luis; Vázquez, Juan T.; Iglesias, Jorge; García-Gil, Soledad; Medialdea, Teresa; León, Ricardo; Estrada, Ferrán; ERGAP, Project; Cruise, Teams
2010-01-01

Digital.CSIC (Spain)

68

CW-EPR and ENDOR study of cytochrome c(6) from Anabaena PCC 7119

García-Rubio, Inés; Medina, Milagros; Cammack, Richard; Alonso Gascón, Pablo J.; Martínez, Jesús I.
2006-09-15

Digital.CSIC (Spain)

72

Alteration of bottom roughness by benthic organisms in a sandy coastal environment.

Guillén, Jorge; Soriano, J. S.; Demestre, Montserrat; Falqués, Albert; Palanques, Albert; Puig, Pere
2008-10-15

Digital.CSIC (Spain)

73

Alteraciones de la motricidad del cuerpo del esófago en pacientes con enfermedad por reflujo gastroesofágico sin reflujo patológico en la monitorización de pH de 24 h/ Esophageal motility disorders in subjects with esophageal reflux disease but without abnormal reflux, measured by 24h Esophageal pH monitoring

Acevedo F, Alberto; Espinoza, Jorge
2000-11-01

Resumen en inglés Background: In a high proportion of patients with symptomatic gastroesophageal reflux disease, 24 h esophageal pH monitoring is normal. Aim: To study esophageal motility in patients with symptomatic gastroesophageal reflux disease and normal 24 h esophageal pH monitoring. Patients and methods: Fourteen patients (12 women, aged 28 to 74 years old) with esophageal reflux disease and normal 24 pH monitoring and 14 asymptomatic controls (8 women, aged 19 to 69 years old), wer (mas) e studied. Symptoms were evaluated using an analog scale and all subjects underwent a barium meal, upper gastrointestinal endoscopy and a standard esophageal manometry. Results: Lower esophageal sphincter was normal in 11 patients, hypotonic in one and displaced to the thorax in two. Esophageal wave amplitude was lower in patients than in asymptomatic controls (10 to 50 and 13 to 70 mm Hg respectively). The proportion of hypotonic waves was Grade I and II in seven patients, Grade III in three and grade IV in four cases. Four patients had localized aperistalsis (that can be considered normal) and four had more severe forms of aperistalsis, along with severe hypotonia. Conclusions: Patients with gastroesophageal reflux disease without alterations in 24 h pH monitoring, have alterations in esophageal motility (Rev Méd Chile 2000; 128: 1237-44)

Scientific Electronic Library Online (Spanish)

74

A stochastic background of gravitational waves from hybrid preheating

García-Bellido, Juan; García Figueroa, Daniel
2006-12-31

Digital.CSIC (Spain)

75

A new gravitational wave background from the Big Bang

García-Bellido, Juan; García Figueroa, Daniel
2008-01-27

Digital.CSIC (Spain)

76

A Gravitational Wave Background from Reheating after Hybrid Inflation

García-Bellido, Juan; García Figueroa, Daniel; Sastre, Alfonso
2007-11-27

Digital.CSIC (Spain)