Sample records for states energy
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1

Variaciones en el contenido de energía en músculos de Salminus brasiliensis en diferentes estados de desenvolvimiento gonadal en el área de influencia del reservatório de Manso, Mato Grosso, Brasil/ Variations in the content of energy in muscle of Salminus brasiliensis in differents states of the gonadal development in the area of influence of the Manso reservoir Mato Grosso

Espínola, Luis A.; Domingues, Wladimir M.; Benedito, Evanilde
2008-03-01

Resumen en español Para que las medidas de conservación y manejo sean efectivas es necesario el entendimiento del origen y destino de la energía por las cuales compiten los organismos en los diferentes ambientes. Con la hipótesis de que existen diferencias en la energía contenida en los músculos durante el desenvolvimiento gonadal de Salminus brasiliensis (Cuvier, 1816), fueron realizadas colectas entre octubre de 2002 a septiembre de 2003, en el reservatório del río Manso. Después (mas) de la obtención de los datos biométricos, de cada individuo se tomaron muestras de la musculatura, las cuales fueron secadas a 60ºC y el contenido calórico (cal/g de peso seco) determinado en una bomba calorimétrica. Los valores del factor de condición y de la Relación Gónada Somática (RGS) fueron comparados con los contenidos calóricos. No fueron identificadas diferencias significativas entre los valores calóricos de machos y hembras de S. brasiliensis. Sin embargo, se pudo constatar diferencias calóricas significativas en los diferentes estados de maduración gonadal tanto en machos como en hembras. Se observaron tendencias diferentes entre los sexos cuando las gónadas de los individuos se encontraban en maduración: para las hembras, la energía aumentó, mientras que para los machos ésta se mantuvo, indicando una mayor variación energética relacionada mas con la maduración gonadal que con el proceso de migración. En ambos sexos, el estado maduro mostró mayor contenido energético en relación con los demás estados. Los valores del factor de condición, para las hembras, fueron mayores que para los machos, siendo que los mayores valores fueron constatados para hembras maduras y para machos esgotados. La RGS fue más elevado para las hembras, que para los machos en los estados maduración y maduro. Se concluye que debido a las variaciones intraespecíficas asociadas a la maduración gonadal, es importante que se tenga información sobre todos los estados del desenvolvimiento gonadal, para ambos sexos. Las condiciones abióticas en que se encuentran los principales cuerpos de agua brasileños también pueden conducir a alteraciones en las concentraciones de energía presentes en los tejidos de los peces. Estudios sobre el uso de la energía pueden ser útiles a las evaluaciones de impacto, sobre todo en lo que respecta a las interferencias antrópicas en el medio acuático, así como a las medidas de administración racional de los recursos a ser explotados. Resumen en inglés In order to achieve effectiveness in conservation and management measures it is necessary to understand the origin and destiny of energy by which organisms compete in different environments. This study tested the hypothesis that there are differences in muscle energy content during the gonadal development of Salminus brasiliensis (Cuvier, 1816) in Manso Reservoir. Fish collections were carried out from October 2002 to September 2003. After biometry, muscle samples of all (mas) individuals were dried at 60ºC and dry weight calorie/gram was determined by acalorimetric pump. Condition factor and Gonad Somatic Relationship (RGS) were compared to caloric values. Significant differences were not detected for caloric values between males and females. However, caloric values of each sex were significantly different among stages of gonadal development. There are different tendencies between sexes for ripening individuals: energy content increases in females, while it remains the same in males. For both sexes, higher levels of energy occurred at the mature stage in relation to the other stages. Females presented better condition factor than males, with higher values for mature females and spent males. Females presented higher RGS than males in ripening and mature stages. Intraspecific differences in muscle energy content suggest that similar studies should take all stages of gonadal development into account for both sexes. Abiotic conditions of Brazilian water bodies can also conduct to alterations in fish issue energy concentrations. Studies of energy content should contribute especially to assess anthropogenic impact in aquatic environments, as well rational measures of resource exploitation.

Scientific Electronic Library Online (Spanish)

2

Condiciones Extremas de Operación en Unidades de Desintegración Catalítica y Multiplicidad de Estados Estacionarios/ Severe Operating Conditions in Catalytic Cracking Units and Multiplicity of Steady-States

Hernández-Barajas, José R; Vázquez-Román, Richart
2007-01-01

Resumen en español Se ha estudiado y analizado las condiciones extremas de operación en unidades de desintegración catalítica y su efecto en la multiplicidad de estados estacionarios. El modelo propuesto está basado en ecuaciones de conservación de materia y energía y ha permitido demostrar que, para ambos modos de combustión, parcial y total, existen entre uno y cinco estados estacionarios. La multiplicidad más común ocurre cuando existen tres estados estacionarios que se presenta (mas) n a condiciones típicas de operación. La existencia de un solo estado estacionario es producida por una disminución abrupta en la eficiencia de la fluidización y distribución del aire en el regenerador. Se han determinado los dominios de atracción y las trayectorias dinámicas de cada estado estacionario en ese escenario y se sugiere que se debe tomar en consideración este fenómeno en el diseño de una estrategia de control robusto. Finalmente, se muestra que la existencia de cinco estados estacionarios está relacionada con una disminución de la velocidad de oxidación heterogénea del monóxido de carbono Resumen en inglés This paper studies an analyzes the effect of severe operating conditions in catalytic cracking units on multiplicity of steady-states. The model proposed here is based on mass and energy conservative equations and has been able to demonstrate the existence of one to five steady states for both partial and complete combustion regimes. The most common multiplicity is the existence of three steady states that occurs at typical operating conditions. The existence of a unique (mas) steady state is produced by an abrupt decrease in both fluidization effectiveness and air distribution inside the regenerator. Attraction domains and dynamic trajectories of each steady state have been determined for this scenario and is suggested that this phenomenon must be taken into account in the design of a robust control strategy. Finally, it is shown that the existence of five steady states is related to a decreasing of the heterogeneous oxidation rate of carbon monoxide

Scientific Electronic Library Online (Spanish)

3

El oscilador repulsivo

Wolf, Kurt Bernardo
2010-06-01

Resumen en español El oscilador repulsivo se caracteriza por tener un potencial que actúa como barrera; es de los pocos sistemas cuánticos cuya solución es explícita. Muestra varios aspectos interesantes debido a que la barrera de potencial separa sus estados en aquellos que clásicamente libran la barrera por tener energía positiva, de aquellos con energía negativa, los cuales parcialmente se reflejan y parcialmente se trasm (mas) iten a través de ella. El espectro de energías es doble, pues los estados se pueden mover a la derecha o la izquierda. Aquí analizamos este sistema en su espacio fase cuántico mediante la función de Wigner y con la estrategia de usar matrices de 2 × 2 para encontrar su evolución en el tiempo, factorizándola en una transformación geométrica y una dinámica. Resumen en inglés The repulsive oscillator is characterized for having a potential that acts as a barrier; it is one of the few quantum systems whose solution is explicit. It shows several interesting aspects due to the potential barrier which separates its states into those that classically surmounts the barrier for having positive energy, from those with negative energy, which partially reflect and partially transmit through it. (mas) The energy spectrum is double, since the states can move to the right or to the left. Here we analyze this system in quantum phase space through the Wigner function, with the strategy of using 2 × 2 matrices to find the time evolution, factorizing it into a geometric and a dynamical transformation.

Scientific Electronic Library Online (Spanish)

4

Perspectivas de la situacion energética mundial. Las oportunidades para Colombia/ Outlook of World Energy Status. Opportunities for Colombia

Infante Villarreal, Arturo
2007-05-01

Resumen en español Casi la cuarta parte de la energía que consume Estados Unidos proviene de petróleo importado y sólo el 6% se origina en fuentes renovables, aunque el país produce 20% de la polución ambiental mundial y tiene sólo 4% de la población total. Los biocombustibles son una fuente potencial de energía renovable para Estados Unidos, y el resto del mundo, porque tienen un balance energético y ambiental bastante favorable. Si las condiciones de precios son adecuadas para lo (mas) s productores de las materias primas, los biocombustibles también tienen un impacto social importante. Colombia tiene posibilidades de participar en los mercados nacionales e internacionales de los biocombustibles sustitutos, tanto de la gasolina como del diesel con etanol y biodiesel, respectivamente. La palma de aceite, la caña de azúcar y la yuca constituyen las materias primas con mayor potencial. Resumen en inglés Almost one fourth of the energy consumed in the U.S. comes from imported oil and only 6% is produced from renewable sources despite the fact that the U.S. is responsible for 20% of the global pollution with barely 4% of the world population. Biofuels are a promising source of renewable energy for the United States and the rest of the world, with favorable energy and environmental balances. If price conditions are adequate for the basic input producers, biofuels will have (mas) an important social impact, as well. Colombia has the possibility to participate in the national and international biofuel substitution markets for gasoline and diesel with ethanol and biodiesel, respectively. Oil Palm, Sugar Cane and Yuca, are the raw materials with the best potential.

Scientific Electronic Library Online (Spanish)

5

Potencial de aprovechamiento de la energía eólica para la generación de energía eléctrica en zonas rurales de México/ WIND ENERGY POTENTIAL FOR ELECTRICITY GENERATION IN RURAL ZONES OF MEXICO/ POTENCIAL DE APROVEITAMENTO DA ENERGIA EÓLICA PARA A GERAÇÃO DE ENERGIA ELÉTRICA EM ZONAS RURAIS DO MEXICO

González-Ávila, María Eugenia; BeltrÁn-Morales, Luis F; Troyo-Diéguez, Enrique; Ortega-Rubio, Alfredo
2006-04-01

Resumen en portugués Resumo México conta com um enorme potencial eólico. Entre os lugares identificados com vento de alta qualidade se encontram suas zonas costeiras, especialmente nos estados da Baixa California, Baixa California do Sul, Sonora, Oaxaca e Yucatán. Desafortunadamente, este potencial tem sido pouco explorado. O presente trabalho analisou zonas rurais com potencial para a geração de energia apartir dos ventos no México, considerando os aspectos sociais e econômicos que fa (mas) zem parte do desenvolvimento de projetos de energia eólica. Os resultados indicam que além do desenvolvimento tecnológico requerido, devem ser fortalecidos os aspectos legais que fomentam e incentivam a produção de energia eólica, e estabelecer regulamentos e normas ambientais que protejam ao ambiente e às populaçðes silvestres. Resumen en español Resumen México cuenta con un enorme potencial eólico. Entre los sitios identificados con viento de alta calidad se encuentran sus zonas costeras, especialmente en los estados de Baja California, Baja California Sur, Sonora, Oaxaca y Yucatán. Desafortunadamente, dicho potencial se ha explotado poco. El presente trabajo analizó zonas rurales con potencial para la generación de energía a partir de los vientos en México, considerando los aspectos sociales y económicos (mas) involucrados en el desarrollo de proyectos de energía eólica. Los resultados indican que además del desarrollo tecnológico requerido, se deben fortalecer los aspectos legales que fomenten e incentiven la producción de energía eólica, y establecer regulaciones y normas ambientales que protejan al ambiente y a las poblaciones silvestres. Resumen en inglés Summary Mexico counts with a great wind potential. Among the sites identified with high quality wind are coastal zones, especially in the Baja California, Baja California Sur, Sonora Oaxaca and Yucatan States. Unfortunately, very little of this potential has been exploited. The present study analyzes rural areas with wind potential for energy generation from in Mexico, considering the social and economic aspects involved in the development of eolic energy projects. The re (mas) sults indicate that besides the technological development required, the legal aspects should be strengthened to enhance the production of electricity from wind. Regulations and environmental norms for protection of the environment and wildlife populations must be developed.

Scientific Electronic Library Online (Spanish)

6

Algoritmos y Métodos para el Reconocimiento de Voz en Español Mediante Sílabas/ Algorithms and Methods for the Automatic Speech Recognition in Spanish Language using Syllables

Oropeza Rodríguez, José Luis; Suárez Guerra, Sergio
2006-03-01

Resumen en español Actualmente el uso de los fonemas tiene implícita varias dificultades debido a que la identificación de las fronteras entre ellos por lo regular es difícil de encontrar en representaciones acústicas de voz. El presente trabajo plantea una alternativa a la forma en la que el reconocimiento de voz se ha estado implementando desde hace ya bastante tiempo, analizando la forma en la cual el paradigma de la sílaba responde a tal labor dentro del español. Durante los exper (mas) imentos realizados fueron examinados para la tarea de segmentación tres elementos esenciales: a) la Función de Energía Total en Corto Tiempo, b) la Función de Energía de altas frecuencias Cepstrales (conocida como Energía del parámetro RO), y c) un Sistema Basado en Conocimiento. Tanto el Sistema Basado en Conocimiento y la Función de Energía Total en Corto Tiempo fueron usados en un corpus de dígitos en donde los resultados alcanzados usando sólo la Función de Energía Total en Corto Tiempo, fueron de 90.58%. Cuando se utilizaron los parámetros Función de Energía Total en Corto Tiempo y la Energía del parámetro RO se obtuvo un 94.70% de razón de reconocimiento. Lo cual causa un incremento del 5% con relación al uso de palabras completas en un corpus de voz dependiente de contexto. Por otro lado, cuando se utilizó un corpus de laboratorio del habla continua al usar la Función de Energía Total en Corto Tiempo y el Sistema Basado en Conocimiento, se alcanzó un 78.5% de razón de reconocimiento y un 80.5% de reconocimiento al usar los tres parámetros anteriores. El modelo del lenguaje utilizado para este caso fue el bigram y se utilizaron Cadenas Ocultas de Markov de densidad continua con tres y cinco estados, con 3 mixturas Gaussianas por estado. Resumen en inglés This work examines the results of incorporating into Automatic Speech Recognition the syllable units for the Spanish language. Because of the boundaries between phonemes-like units its often difficult to elicit them; the use of these has not reached a good performance in Automatic Speech Recognition. In the course of the developing the experiments three approaches for the segmentation task were examined: a) the using of the Short Term Total Energy Function, b) the Energy (mas) Function of the Cepstral High Frequency (named ERO parameter), and c) a Knowledge Based System. They represent the most important contributions of this work; they showed good results for the Continuous and Discontinuous speech corpus developed in laboratory. The Knowledge Based System and Short Term Total Energy Function were used in a digit corpus where the results achieved using Short Term Total Energy Function alone reached 90.58% recognition rate. When Short Term Total Energy Function and RO parameters were used a 94.70% recognition rate was achieved. Otherwise, in the continuous speech corpus created in the laboratory the results achieved a 78.5% recognition rate using Short Term Total Energy Function and Knowledge Based System, and 80.5% recognition rate using the three approaches mentioned above. The bigram model language and Continuous Density Hidden Markov Models with three and five states incorporating three Gaussian Mixtures for state were implemented. By further including a major number of digital filters and Artificial Intelligent techniques in the training and recognition stages respectively the results can be improved even more. This research showed the potential of the syllabic unit paradigm for the Automatic Speech Recognition for the Spanish language. Finally, the inference rules in the Knowledge Based System associated with rules for splitting words in syllables in the cited language were created.

Scientific Electronic Library Online (Spanish)

7

Receptividad ganadera: marco teórico y aplicaciones prácticas/ Carrying capacity of animal production systems: theoretical framework and practical applications

Golluscio, Rodolfo
2009-12-01

Resumen en español Esta ayuda didáctica pretende ilustrar acerca del concepto de receptividad ganadera y las dificultades que presenta su cálculo. En el marco del modelo logístico de crecimiento poblacional, la receptividad es la densidad máxima de individuos de una población que puede vivir en un hábitat determinado. Sin embargo, ese modelo supone que (1) el ambiente es invariable en el tiempo y en el espacio, (2) todos los individuos de la población usan los recursos con la misma e (mas) ficiencia, y (3) la población no tiene competidores, parásitos o depredadores. Dado que esos supuestos no se cumplen en los sistemas ganaderos, y que la intervención del hombre en los ecosistemas modifica su receptividad, el concepto de receptividad ganadera difiere del concepto original de receptividad. Así, en términos agronómicos, la receptividad ganadera ha sido definida como "la densidad máxima de animales que puede mantenerse en un área determinada, en un cierto nivel de producción, sin deteriorar el recurso." El marco conceptual más adecuado para entender los determinantes de la receptividad ganadera es el modelo del flujo de energía. De él se desprende que, para lograr un uso sustentable de los ecosistemas pastoriles, los herbívoros deberían consumir sólo una proporción de la Productividad Primaria Neta Aérea (PPNA), conocida como Índice de Cosecha. Hasta el momento no se ha acuñado una metodología de cálculo de aceptación universal para estimar la receptividad debido a: (1) la ausencia de modelos confiables que permitan predecir el Índice de Cosecha en sitios con distintas condiciones ambientales y tipos de vegetación, en distintos años y en distintos momentos del año, (2) la multiplicidad de factores que determinan la receptividad, incluyendo tanto los factores ambientales vinculados a la disponibilidad de forraje como los factores ambientales extraforrajeros (e.g., depredadores) y los factores de manejo (e.g, método de pastoreo) y (3) las interacciones entre esos factores y las decisiones del productor, que reflejan sus objetivos empresariales y los niveles de riesgo que asume. En consecuencia, al definir la receptividad ganadera de un ecosistema dado se deben observar varias precauciones: una selección cuidadosa de los mejores métodos para cada objetivo particular y región, una actitud conservadora, un monitoreo continuo del estado de la vegetación y de la producción individual de los animales en relación a los objetivos productivos (ningún cálculo que afecte negativamente alguna de esas variables puede considerarse sustentable), y una actitud flexible para modificar la densidad ganadera bajo condiciones climáticas particulares, de manera de promover los procesos regenerativos o prevenir transiciones a estados más degradados. Resumen en inglés This article is conceived as a didactic aid to use in graduate and post-graduate courses of Ecology and Grassland Science. It aims to illustrate the concept of carrying capacity when applied to animal production systems, and also the difficulties involved in its calculus. The concept of carrying capacity derives from the classical logistic model of population growth, and is defined as the maximum density a population can attain in one habitat. However, that model assumes (mas) that (1) the environment is invariable in time and space, (2) all the individuals of the depredators or parasites. Taking into account that these three assumptions are not fulfilled in animal production systems, and that human intervention alters ecosystem carrying capacity, the concept of carrying capacity of animal production systems differs from that of the logistic model. The carrying capacity of animal production systems has been defined as "the maximum animal density that can be maintained in one area under a certain production level without deteriorate the resource". The most adequate conceptual framework to understand the factors determining the carrying capacity of animal production systems is the model of energy flux. It suggests that domestic herbivores may consume only a proportion of Aboveground Net Primary Production, known as Harvest Index, to make a sustainable use of rangeland ecosystems. There not exist, until now, an universally accepted methodology to estimate the carrying capacity of animal production systems because of: (1) the lack of reliable models to predict Harvest Index in sites differing in environmental conditions or vegetation structure, or in different years or seasons, (2) the vast array of factors determining carrying capacity, including those directly linked to forage availability (as precipitation, fertility, soil texture, etc.) as good as those environmental factors unlinked to forage availability (as water availability, climatic risks, predators, etc.) and those factors linked to range management (as grazing system), and (3) the interactions among these factors and the producer decisions, which reflect the objectives the producer fix to its business and the levels of economic risk he assumes. As a consequence, when defining the carrying capacity of an animal production system, several precautions must be taken: a careful selection of the best method for each objective and region, a conservative attitude, a continuous monitoring of the status of vegetation and individual animal production parameters (no calculus negatively affecting any of those parameters can be considered as sustainable), and a flexible attitude allowing to modify the stocking density in order to promote regenerative processes or prevent transitions to more degraded states.

Scientific Electronic Library Online (Spanish)

8

Estudio de las propiedades electrónicas de cúmulos de Pd: un estudio comparativo usando distintas técnicas y aproximaciones

Aguilera-Granja, F; Montejano-Carrizales, J.M; Vega, A; Ferrer, J; Rogan, J; García, G
2008-04-01

Resumen en español Realizamos un estudio sistemático de las propiedades magnéticas colineales y no-colineales, así como de la metalicidad en cúmulos libres de PdN (2(mas) e fuerte (TB), que son dos de las técnicas más utilizadas en el campo cuando se trata de estudiar propiedades electrónicas de cúmulos. Encontramos que el magnetismo colineal presenta un comportamiento decreciente no-monotono como función del tamaño del cúmulo. Observamos también que la gemelación de los cúmulos puede, en algunos casos, aumentar el momento magnético en cúmulos de tamaño relativamente grande. En el caso de magnetismo no-colineal, encontramos que corresponde siempre a un estado excitado de baja energía, presentando el estado base siempre un orden magnético colineal. En cuanto a los métodos usados encontramos, en general, que las propiedades electrónicas, como el magnetismo, que se obtienen de la diferencia entre poblaciones electrónicas, están en general bien descritas por modelos semi-empíricos, aunque otras propiedades como el carácter metálico, cuya descripción requiere de la determinación exacta de la posición de los estados electrónicos, son también razonablemente descritas si el tamaño de los cúmulos es suficientemente grande. Comparamos nuestros resultados con cálculos previos reportados en la literatura así como con los resultados experimentales disponibles. Resumen en inglés A systematic study of the colineal and no-colineal magnetic properties and the metallic behavior in free standing clusters of PdN (2(mas) used techniques to study the electronic properties of clusters. We found that the colineal magnetism has a no-monotonic decreasing behavior as a function of the cluster size. We observe that the twinning of clusters in some cases can increase the magnetic moment of relatively large size clusters. We found that the no-colineal magnetism always corresponds to a low energy excited state, and that the ground state always presents a colineal magnetic order. Respect to the methods, in general we found that the semi-empirical ones describe very well the electronic properties, as the magnetism; that are obtained from the difference between electronic populations. Although the metallicity requires of the exact determination of the position of the electronic states, it is razonably described by the semi-empirical method if the clusters size is big enough. We compare our results with previous calculations as well as with some experiments reported in the literature.

Scientific Electronic Library Online (Spanish)

9

El ión molecular exótico H4(3+) en un campo magnético intenso

Olivares Pilón, H.
2006-04-01

Resumen en español Utilizando el método variacional se realiza un estudio detallado de los estados electrónicos mas bajos con m = 0, -1 del ión molecular exótico H4(3+) en campos magnéticos intensos B 10(13) G, en la configuración lineal y simétrica, paralela a la dirección del campo magnético. Se hace una extensión del primer estudio del estado base 1σg (J.C. López y A. Turbiner, Phys. Rev (mas) . A 62, 022510, 2000), obteniendo que la curva de energía potencial desarrolla un mínimo suficientemente profundo para distancias internucleares finitas, indicando la posible existencia del ion molecular H4(3+), para campos magneticos B 3 x 10(13)G. Se demuestra por primera vez que el estado excitado 1πu puede existir para un campo magnetico B = 4.414 x 10(13) G correspondiente al límite de aplicabilidad de la teoría no-relativista. Resumen en inglés Using the variational method, a detailed study of the lowest m = 0,-1 electronic states of the exotic molecular ion H4(3+) in a strong magnetic field, in the linear symmetric configuration parallel to the direction of the magnetic field is carried out. A extended study of the 1σg ground state (J.C. Lopez and A.Turbiner, Phys. Rev. A 62, 022510, 2000) was performed obtaining that the potential energy curve displays a sufficiently deep minimum for finite internuclear d (mas) istances, indicating the possible existence of the molecular ion H4(3+), for magnetic fields of strength B 3 x 10(13) G. It is demonstrated that the excited state 1πu can exist for a magnetic field B = 4.414 x 10(13) G corresponding to the limit of applicability of the non-relativistic theory.

Scientific Electronic Library Online (Spanish)

10

Interacción de un láser con un ion atrapado incluyendo dependencia temporal

Vargas-Martínez, J.M.; Martí-Panameño, E. A.; Moya-Cessa, H.
2009-12-01

Resumen en español En la actualidad es posible atrapar iones individuales en trampas de Paul o de Penning, las partículas cargadas son confinadas en el espacio mediante campos electromagnéticos. Un ion atrapado puede contener mucha energía vibracional, lo cual es indeseable en ciertas aplicaciones. En este artículo, partiendo del hamiltoniano de un ion atrapado en un potencial armónico, se demuestra que es posible encontrar transiciones tipo Jaynes-Cummings y anti-Jaynes-Cummings en el (mas) régimen de intensidad intermedia, es decir, ajustando la intensidad del láser que induce el acoplamiento entre los estados internos y vibracionales del ion proporcionalmente a la frecuencia de vibración del ion; estas transiciones son de utilidad porque hacen posible extraer dicha energía vibracional. En nuestro tratamiento consideramos que el ion y el láser están en resonancia, lo que elimina la necesidad de usar láseres sintonizables. También analizamos el problema de un ion atrapado en una trampa dependiente del tiempo interactuando con un haz láser. Mediante un conjunto de transformaciones unitarias con parámetros dependientes del tiempo mostramos que este sistema es equivalente a la interacción entre un haz cuantizado y un sistema de dos niveles con parámetros dependientes del tiempo. El hamiltoniano es linealizado de tal forma que puede ser resuelto mediante métodos que se encuentran en la literatura y que involucran parámetros dependientes del tiempo. La linealización está libre de aproximaciones y de consideraciones sobre los parámetros del sistema, como son, por ejemplo, el parámetro de Lamb- Dicke, la dependencia temporal de la frecuencia de la trampa y la desintonía, con lo que se logra obtener la mejor solución para este tipo de sistemas. También mostramos un caso particular de dependencia temporal de la trampa. Resumen en inglés Nowadays it is possible to trap single ions in Paul or Penning traps, charged particles are confined in space via electromagnetic fields. A trapped ion can have a lot vibrational energy which is undesirable in some applications. In this paper, starting from the Hamiltonian of a trapped ion in a harmonic potential, we show that it is possible to get Jaynes-Cummings and anti- Jaynes- Cummings- like transitions in the intermediate intensity regime, that is, adjusting the int (mas) ensity of the laser that induce the coupling between the internal and vibrational states of the ion proportionally to the vibrational frequency of the ion; these transitions are useful because make it possible to extract the vibrational energy. In our treatment we consider that the ion and the laser are in resonance what eliminate the need of using tuned lasers. Also, the problem of a trapped ion in a trap with time-dependent parameters interacting with a laser field is analyzed. By using a set of time-dependent unitary transformations is shown that this system is equivalent to the interaction between a quantized field and a two level system with time dependent parameters. The Hamiltonian is linearized in such a way that can be solved with methods that are found in some papers and that involve time-dependent parameters. The linearization is free of approximations and assumptions on the parameters of the system as are, for instance, the Lamb-Dicke parameter, the time-dependency of the frequency trap and the detuning, with what we can obtain the best solution for this kind of system. Also, we show a particular case of time-dependency of the trap.

Scientific Electronic Library Online (Spanish)

11

Análisis de exergía en estado permanente de un destilador solar simple/ Steady-State Exergy Analysis of a Simple Solar Still

Torchia-Núñez, J.C.; Porta-Gándara, M.A.; Cervantes-de Gortari, J.G.
2010-03-01

Resumen en español En este trabajo se presenta un análisis teórico de exergía de un destilador solar simple en estado permanente. Mediante un balance de energía sobre los tres componentes principales de un destilador solar -colector, salmuera y cubierta de vidrio- para un conjunto de valores de parámetros -irradiancia solar, temperatura ambiente y espesor de aislamiento-, se obtienen las temperaturas de los componentes para distintas condiciones. Con estas temperaturas se pueden encont (mas) rar los flujos de exergía y eficiencias de segunda ley en un destilador solar. Los resultados muestran que la irradiancia solar es el parámetro más influyente en los procesos de transporte dentro del destilador, seguido por el espesor del aislamiento térmico. Para una irradiancia solar de 1,000 W/m², el colector cede 13% del total de exergía que llega al agua salada. El agua salada utiliza más del 6% de este total para la evaporación. Las irreversibilidades alcanzan 86% de la exergía total. La relación energía/exergía muestra que el componente más eficiente en el destilador solar es la masa de agua salada con más de 90% para cualquier valor de los parámetros estudiados mientras que el colector alcanza el 23% para un valor de 1,000 W/m² de irradiancia solar. El destilador solar es un dispositivo que aprovecha el calentamiento de un colector con alta eficiencia y la discusión sobre su uso, como todos los sistemas solares, no debe ser por sus limitaciones termodinámicas. Resumen en inglés This paper presents a steady-state, theoretical exergy analysis of a solar still, focused on the exergy flows in the components of the still: collector plate, brine and glass cover. The analytical approach states an energy balance for each component resulting in three coupled equations where three parameters -solar irradiance, ambient temperature and insulation thickness- are studied. The energy balances are solved to find temperatures of each component; these temperature (mas) s are used to compute energy and exergy flows. Results in the steady-state regime show that the collector transports 13% of incident radiation exergy to the heat the brine, while in the brine the evaporation exergy accounts for the 6% of total exergy. Exergy/energy ratio shows that the most efficient component is the brine reaching more than 90% for almost any value of the parameters under study, while the collector has a 23% exergy/energy ratio for a 1,000 W/m² solar energy input. The solar still is a device that uses efficiently the heating of a collector and the general discussion about its promotion should not, as it must be with almost every other solar device, be about thermodynamic limitations.

Scientific Electronic Library Online (Spanish)

12

β-carotene to bacteriochlorophyll c energy transfer in self-assembled aggregates

Alster, Jan; Polívka, Tomás; Arellano, Juan B.; Chábera, Pavel; Vácha, Frantisek; Psencik, Jakub
2010-08-01

Digital.CSIC (Spain)

13

Zeeman energy and anomalous spin splitting in lateral GaAs quantum dots

Valín-Rodríguez, Manuel; Puente, Antonio; Serra, Llorenç

5 pages (final publisher version).-- 6 pages, 6 figures (attached post-print version).-- PACS nrs.: 73.21.La, 73.21.-b.-- Pre-print version available at ArXiv: http://arxiv.org/abs/cond-mat/0403202v1. | The level splittings induced by a horizontal magnetic field in a parabolic two-dimensional quantu...

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14

Yrast studies of Se-80,Se-82 using deep-inelastic reactions

Jones, G. A.; Regan, P. H.; Podolyak, Zs.; Yoshinaga, N.; Higashiyama, K.; De Angelis, G.; Zhang, Y. H.

5 pages, 5 figures.-- PACS nrs.: 21.10.-k; 21.60.Cs; 25.70.Hi; 27.50.+e.-- ISI Article Identifier: 000251327000034. | We report the results of an experiment in which we studied the near-yrast states in selenium isotopes approaching N=50 following their population in multinucleon transfer reactions b...

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16

Vibrational quenching of CO2(010) by collisions with O(3P) at thermal energies: A quantum-mechanical study

Lara Castells, M. Pilar de; Hernández, Marta I.; Delgado Barrio, Gerardo; Villarreal, Pablo; López-Puertas, Manuel

10 pages, 6 figures, 1 table, 1 appendix.-- PACS nrs.: 34.50.Ez; 33.20.Tp; 33.15.Mt; 31.15.Ar. | The CO2(010)–O(3P) vibrational energy transfer (VET) efficiency is a key input to aeronomical models of the energy budget of the upper atmospheres of Earth, Venus, and Mars. This work addresses the physi...

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17

Vibrational quenching of CO2(010) by collisions with O(3P) at thermal energies: A quantum-mechanical study

Lara Castells, M. Pilar de; Hernández, Marta I.; Delgado Barrio, Gerardo; Villarreal, Pablo; López-Puertas, Manuel
2006-04-24

Digital.CSIC (Spain)

18

Transition-state spectroscopy of the photoinduced Ca + CH3F reaction. 3. Reaction following the local excitation to Ca(4s3d 1D)

Gloaguen, Eric; Sanz, Cristina; Collier, M.; Gaveau, M.-A.; Soep, B.; Roncero, Octavio; Mestdagh, J.-M.
2008-01-31

Digital.CSIC (Spain)

19

Transition state spectroscopy of the excited electronic states of Li–HF

Aguado, Alfredo; Paniagua, Miguel; Sanz, Cristina; Roncero, Octavio

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20

Transition state spectroscopy of the excited electronic states of Li–HF

Aguado, Alfredo; Paniagua, Miguel; Sanz, Cristina; Roncero, Octavio
2003-11-15

Digital.CSIC (Spain)

21

Transition state spectroscopy of open shell systems: Angle-resolved photodetachment spectra for the adiabatic singlet states of OHF

Gómez Carrasco, Susana; Aguado, Alfredo; Paniagua, Miguel; Roncero, Octavio

16 pages, 13 figures, 2 tables.-- Printed version published Aug 15, 2007.-- Issue title: "Theoretical Aspects of Photoinduced Processes in Complex Systems". | In this work three-dimensional potential energy surfaces of the first five singlet states of OHF are developed based on fits of more than 10,...

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23

Transition state dynamics of OHF on several electronic states: Photodetachment spectrum of OHF- and conical intersections

González-Sánchez, Lola; Gómez Carrasco, Susana; Aguado, Alfredo; Paniagua, Miguel; Hernández, M. Luz

11 pages, 12 figures, 1 table.-- PACS nrs.: 33.80.Eh; 33.70.Ca; 31.50.Df; 31.50.Bc; 31.15.Ar; 82.20.Db; 33.20.Wr; 33.15.Bh. | Wave packet simulations of the photodetachment spectrum of OHF– are performed on several electronic adiabatic states, two triplets and four singlets of neutral OHF. The trans...

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24

Transition state dynamics of OHF on several electronic states: Photodetachment spectrum of OHF- and conical intersections

González-Sánchez, Lola; Gómez Carrasco, Susana; Aguado, Alfredo; Paniagua, Miguel; Hernández, M. Luz; Alvariño, José M.; Roncero, Octavio
2004-11-22

Digital.CSIC (Spain)

25

Time-dependent wave packet and quasiclassical trajectory study of the C(3P)+OH(X 2)CO(X 1+)+H(2S) reaction at the state-to-state level

Bulut, Niyazi; Zanchet, Alexander; Honvault, Pascal; Bussery-Honvault, Béatrice; Bañares, Luis
2009-05-19

Digital.CSIC (Spain)

27

The van der Waals potential energy surfaces and structures of He–ICl and Ne–ICl clusters

Prosmiti, Rita; Cunha, Carlos; Villarreal, Pablo; Delgado Barrio, Gerardo
2002-10-15

Digital.CSIC (Spain)

28

The high-energy emission of GRO J1655-40 as revealed with INTEGRAL spectroscopy of the 2005 outburst

Caballero García, María Dolores; Miller, J. M.; Kuulkers, E.; Trigo, M. D.; Homan, J.; Lewin, W. H. G.; Kretschmar, P.; Domingo, A.; Mas-Hesse, J. Miguel; Wijnands, R.; Fabian, A. C.; Fender, R. P.; Van der Klis, M.
2007-11-01

Digital.CSIC (Spain)

29

The doubly closed shell nucleus Sn-132(50)82

Björnstad, T.; García Borge, María José; Blomqvist, J.; Von Dincklage, R. D.; Ewan, G. T.; Hoff, P.

23 pages, 4 tables, 10 figures. | The structure of excited states in Sn-132, fed in the β-decay of In-132, has been investigated. Absolute intensities were deduced from γ-singles measurements. From multi-spectrum analysis of γ-lines the half-life of In-132 was determined to be 186 ± 22 ms. A level s...

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30

The beta 2p decay mechanism of Ar-31

Fynbo, H. O. U.; García Borge, María José; Axelsson, L.; Äystö, J.; Bergmann, U. C.; Fraile, Luis M.; Honkanen, A.; Hornshøj, P.; Jading, Y.; Jokinen, A.; Jonson, B.; Martel, Ismael; Mukha, I.; Nilsson, T.; Nyman, G.; Oinonen, M.; Piqueras, Inmaculada; Riisager, K.; Siiskonen, T.; Smedberg, M. H.; Tengblad, Olof; Thaysen, J.; Wenander, F.
2000-08-15

Digital.CSIC (Spain)

31

The Standard Model prediction for eps'/eps

Pallante, Elisabetta; Pich, Antonio; Scimemi, Ignazio
2001-06-01

Digital.CSIC (Spain)

32

The CP43 Proximal Antenna Complex of Higher Plant Photosystem II Revisited: Modeling and Hole Burning Study. I

Dang, Nhan C.; Zazubovich, Valter; Reppert, Mike; Neupane, Bhanu; Picorel Castaño, Rafael; Seibert, Michael; Jankowiak, Ryszard
2008-08-01

Digital.CSIC (Spain)

33

Temperature-dependent linewidth of charged excitons in semiconductor quantum dots: Strongly broadened ground state transitions due to acoustic phonon scattering

Urbaszek, B.; McGhee, E. J.; Krüger, M.; Warburton, Richard J.; Karrai, Khaled; Amand, T.; Gerardot, B. D.; Petroff, Pierre M.; García, Jorge M.
2004-01-08

Digital.CSIC (Spain)

34

Systematic investigation of the drip-line nuclei Li-11 and Be-14 and their unbound subsystems Li-10 and Be-13

Simon, H.; Meister, M.; Aumann, T.; García Borge, María José; Chulkov, L. V.; Pramanik, U. Datta; Elze, Th. W.

36 pages, 10 figures, 8 tables, 3 appendices.-- PACS nrs.: 27.20.+n; 24.70.+s.-- Printed version published Jul 15, 2007. | Fragmentation reactions in a carbon target with beams of Li-11 and Be-14 at relativistic energies have been studied in a kinematically complete experiment at the ALADIN-LAND set...

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35

Systematic investigation of the drip-line nuclei Li-11 and Be-14 and their unbound subsystems Li-10 and Be-13

Simon, H.; Meister, M.; Aumann, T.; García Borge, María José; Chulkov, L. V.; Pramanik, U. Datta; Elze, Th. W.; Emling, H.; Forssen, C.; Geissel, H.; Hellstroem, M.; Jonson, B.; Kratz, Jx.; Kulessa, R.; Nilsson, T.; Nyman, G.; Richter, A.; Riisager, K.; Scheidenberger, C.; Schrieder, G.; Tengblad, Olof; Zhukov, M. V.
2007-05-13

Digital.CSIC (Spain)

36

Symmetry patterns in the (N, Δ) spectrum

González Marhuenda, Pedro; Vijande, Javier; Valcarce, A.; Garcilazo, H.

4 pages, 2 figures.-- ISI Article Identifier: 000248297600105.-- ArXiv pre-print available at: http://arxiv.org/abs/hep-ph/0610288 | Talk given at the 18th International Conference on Few-Body Problems in Physics, August 21-26 2006, Santos, Sao Paulo, Brazil. | We revise the role played by symmetry ...

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37

Study of the unbound nucleus N-11 by elastic resonance scattering

Axelsson, L.; García Borge, María José; Fayans, S.; Goldberg, V. Z.; Grévy, S.; Guillemaud-Mueller, D.; Jonson, B.; Kälman, K. M.; Lönnroth, T.; Lewitowicz, M.; Manngård, P.; Markenroth, K.; Martel, Ismael; Mueller, A. C.; Mukha, I.; Mukha, I.; Nilsson, T.; Nyman, G.; Orr, N. A.; Riisager, K.; Rogatchev, G. V.; Saint-Laurent, M. G.; Serikov, I. N.; Sorlin, O.; Tengblad, Olof; Wenander, F.; Winfield, J. S.; Wolski, R.
1996-10-01

Digital.CSIC (Spain)

38

Single- and low-lying-states dominance in two-neutrino double-beta decay

Moreno, Oscar; Álvarez-Rodríguez, Raquel; Sarriguren, Pedro; Moya de Guerra, Elvira; Šimkovic, F.; Faessler, A.
2009-01-01

Digital.CSIC (Spain)

39

Sensibilidad tisular a la insulina antes, durante y después de un ayuno en ovejas prepúberes/ Insulin sensitivity before, during and after fasting in ewe lambs

RECABARREN, S. E.; LOBOS, A.; SCHNEIDER, C.; COX, J.; PARILO, J. A.
2000-01-01

Resumen en español Con el fin de explicar las modificaciones en la secreción de LH que se observan durante el ayuno en animales, se ha postulado que señales metabólicas de origen sanguíneo serían captadas por sensores a nivel central o periférico, los cuales transmitirían la información sobre el estatus metabólico hacia las neuronas GnRH para producir ajustes en su secreción y consecuentemente en la de LH. Entre estas señales se ha postulado a la insulina. Es poco conocido el pos (mas) ible rol de la insulina como señal metabólica en ovejas prepúberes en estados de balance energético negativo experimental como por ejemplo el ayuno. La acción de la insulina en estas condiciones experimentales podría estar asociada a la sensibilidad tisular a la insulina. El objetivo del presente trabajo fue establecer la sensibilidad a la insulina en ovejas prepúberes de 16 semanas antes, durante y después de un ayuno corto de 8 días. Para ello, 6 ovejas Suffolk Down prepúberes recibieron un bolo de insulina (0,1 UI/kg PV) endovenosa el día anterior (día 0), el día 1 y el día 8 de ayuno y 24 horas después de finalizado el ayuno (día 9). Se midió glucosa plasmática a los 0,3,5,7,10, y 15 min después de la administración de insulina para calcular el índice de sensibilidad a la insulina (ISI= glucosa al tiempo 3 min (G0) menos la glucosa al tiempo 15 min, obtenida mediante el análisis de regresión de los valores de glucosa, dividido por G0). Se midió la concentración plasmática de insulina a los ­5, 0,3,5,7,10,15,20, y 60 min después de la administración de insulina. Se midió también la LH plasmática a los 0,10,20,40 y 60 min después de la administración de insulina en cada uno de los días del ensayo para determinar el efecto de la insulina sobre la secreción aguda de LH. Las concentraciones basales de cortisol se midieron los días 0, 1, 8 y 9 del ensayo para reconocer el posible estrés inducido por el ayuno. EL ISI no cambió entre el día 0 y 1, pero disminuyó del día 1 al día 8 de ayuno con un rango de 0,21 a 0,28 y de -0,36 a 0,22 respectivamente, con una mediana de 0,23 y 0,02 respectivamente (P Resumen en inglés It has been proposed that blood-borne metabolic signals are captured by central or peripheral sensors to inform to the GnRH pulse generator about the metabolic status of the growing animal to make proper adjustments in the GnRH pulsatile secretion. During states of food restriction or fasting, the GnRH, and consequently, the LH secretion are reduced, probably due to inhibitory influences exerted by metabolic signals. Insulin has been suggested as a potential metabolic sig (mas) nal. However, little is known about the insulin sensitivity in prepubertal ewes, during experimental induction of negative energy balance, such as fasting, which may explain in part the effect of insulin as a metabolic signal. The purpose of this study was to establish the insulin sensitivity during fasting in ewe lambs. Six ewe lambs were given a bolus of insulin (0.1 IU/kg BW), one day before (day 0), on day 1, on day 8 of fasting and 24 hours (day 9) after the end of the 8-days fast. Plasma glucose concentrations were measured at 0,3,5,7,10, and 15 min after the insulin administrations to calculate the insulin sensitivity index (ISI= glucose at time 0 (G0) minus glucose at time 15, obtained from a regression curve, divided by G0). Plasma insulin concentrations were measured at-5, 0,3,5,7,10,15,20, and 60 min after insulin administration. On the other hand, plasma LH concentrations were measured at 0,10,20,40 and 60 min after insulin administrations in each day of the study to determine the effect of insulin on the acute LH secretion. Basal plasma concentrations of cortisol on day 0, day 1, 8 and 9 were also determined. The ISI did not change from day 0 to day 1, but decreased from day 1 to day 8 of fasting, range: 0.21 to 0.28 and -0.36 to 0.22 respectively with a median of 0.23 and 0.02 respectively (P

Scientific Electronic Library Online (Spanish)

40

Search for pentaquarks in the hadronic decays of the Z boson with the DELPHI detector at LEP

Abdallah, J.; Abreu, P.; Adam, W.; Adzic, P.; Albrecht, T.; Alemany-Fernández, R.; Allmendinger, T.

10 pages, 5 figures.-- ISI Article Identifier: 000250074000007.-- ArXiv pre-print available at: http://arxiv.org/abs/0708.0415.-- Printed version published on Sep 20, 2008. | The quark model does not exclude states composed of more than three quarks, like pentaquark systems. Controversial evidence f...

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42

Search for new particles leading to Z plus jets final states in p(p)over-bar collisions at sqrt{s}=1.96 TeV | Search for new particles leading to Z + jets final states in p(p)over-bar collisions at sqrt{s}=1.96 TeV

Aaltonen, T.; Abulencia, A.; Adelman, J.; Affolder, T.; Akimoto, T.; Albrow, M. G.; Amerio, S.; Amidei, D.

24 pages, 38 figures.-- PACS nrs.: 13.85.Rm; 13.85.Qk; 14.70.Hp; 14.80.-j.-- ISI Article Identifier: 000250621200011.-- ArXiv pre-print available at: http://arxiv.org/abs/0706.3264 | We present the results of a search for new particles that lead to a Z boson plus jets in p(p)over-bar collisions at s...

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43

Search for high-mass diphoton states and limits on Randall-Sundrum gravitons at CDF

Aaltonen, T.; Abulencia, A.; Adelman, J.; Affolder, T.; Akimoto, T.; Albrow, M. G.; Amerio, S.; Amidei, D.

7 pages, 4 figures.-- PACS nrs.: 13.85.Rm, 11.25.Wx, 13.85.Qk, 14.80.-j.-- ISI Article Identifier: 000250506000016.-- ArXiv pre-print available at: http://arxiv.org/abs/0707.2294 | We have performed a search for new particles which decay to two photons using 1.2 fb(-1) of integrated luminosity from ...

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44

Rotranslational state-to-state rates and spectral representation of inelastic collisions in low-temperature molecular hydrogen

Montero, Salvador; Thibault, Franck; Tejeda, Guzmán; Fernández Sánchez, José María
2006-09-22

Digital.CSIC (Spain)

45

Reply to Comment on 'Question of low-lying intruder states in Be-8 and neighboring nuclei'

Fayache, M.S.; Moya de Guerra, Elvira; Sarriguren, Pedro; Sharon, Y.Y.; Zamick, L.
1999-05-01

Digital.CSIC (Spain)

46

Question of low-lying intruder states in Be-8 and neighboring nuclei

Fayache, M.S.; Moya de Guerra, Elvira; Sarriguren, Pedro; Sharon, Y.Y.; Zamick, L.
1998-05-01

Digital.CSIC (Spain)

47

Quadrupole deformed and octupole collective bands in Ra-228

Gulda, K.; Mach, H.; Aas, A. J.; García Borge, María José; Burke, D. G.; Fogelberg, B.; Gietz, H.; Grant, I. S.

19 pages, 4 tables, 4 figures.-- PACS nrs.: 21.10.-k; 23.20.-g; 23.20.Lv; 23.20.Nx. | Spins and parities for collective states in Ra-228 have been determined from conversion electron measurements with a mini-orange β spectrometer. The fast-timing βγγ(t) method has been used to measure lifetimes of T...

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48

Proton-proton correlations observed in two-proton decay of 19Mg and 16Ne

Mukha, I.; Grigorenko, L.; Summerer, K.; Acosta, L.; Álvarez, M. A. G.; Casarejos, E.; Chatillon, A.

5 pages, 6 figures.-- PACS nrs.: 21.10.-k; 21.45.+v; 23.50.+z. | Proton-proton correlations were observed for the two-proton decays of the ground states of $^{19}$Mg and $^{16}$Ne. The trajectories of the respective decay products, $^{17}$Ne+p+p and $^{14}$O+p+p, were measured by using a tracking te...

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49

Protein folding kinetics: barrier effects in chemical and thermal denaturation experiments

Naganathan, Athi N.; Doshi, Urmi; Muñoz van den Eynde, Víctor
2007-04-10

Digital.CSIC (Spain)

50

Potential energy surface and reactive collisions for the Au+H2 system

Zanchet, Alexander; Roncero, Octavio; Omar, Salama; Paniagua, Miguel; Aguado, Alfredo
2010-01-15

Digital.CSIC (Spain)

51

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

12 pages, 14 figures, 1 table.-- PACS nrs.: 82.30.Cf; 82.20.Kh; 31.15.Ar; 33.15.Mt; 33.80.Gj; 31.25.Eb; 31.50.Bc. | In this work a simulation of the OHF- photodetachment spectrum is performed in a three-dimensional potential energy surface recently developed for OHF(3A''). The ground 2A' state poten...

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52

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)

54

On the β-decay of C-9

Bergmann, U. C.; García Borge, María José; Boutami, Rafik; Fraile, Luis M.; Fynbo, H. O. U.; Hornshøj, P.; Jonson, B.; Markenroth, K.; Martel, Ismael; Mukha, I.; Nilsson, T.; Nyman, G.; Oberstedt, A.; Prezado Alonso, Yolanda; Riisager, K.; Simon, H.; Tengblad, Olof; Wenander, F.; Wilhelmsen Rolander, K.
2001-09-24

Digital.CSIC (Spain)

55

New high-spin isomer and quasiparticle-vibration coupling in Ir-187

Algora, Alejandro; Modamio, V.; Jungclaus, A.; Bazzacco, D.; Escrig, D.; Fraile, L. M.; Lenzi, S.; Marginean, N.; Martinez, T.; Napoli, D. R.; Schwengner, R.; Ur, C. A.
2010-05-12

Digital.CSIC (Spain)

56

Nanocomposite hybrid molecular materials for application in solid-state electrochemical supercapacitors

Cuentas Gallegos, A. K.; Lira-Cantú, Monica; Casañ Pastor, Nieves; Gómez-Romero, P.
2005-01-01

Digital.CSIC (Spain)

57

México 2008: el año en que se vivió en peligro/ Mexico 2008: The Year of Living Dangerously

LANGSTON, JOY; PÉREZ, BERNARDO
2009-01-01

Resumen en español El trabajo muestra los obstáculos que tendrá que librar la administración si acaso quiere seguir contando con el apoyo de los votantes, como el combate al narcotráfico y los efectos de la crisis financiera de EUA en la economía nacional. También analiza el paquete de reformas con las que el Presidente Calderón pretende darle continuidad a sus políticas en el 2008: la judicial, que modernizaría el sistema de impartición de justicia; la energética, que modificar� (mas) �a el régimen de la empresa más importante del Estado, y la educativa, que reduciría los rezagos educativos mediante maestros mejor capacitados. También discute las características del Congreso que las aprueba, entre ellas un PRD dividido, un PRI cada vez más fuerte en los estados y unas elecciones intermedias cada vez más cercanas Resumen en inglés This article explains how the fight against narco-trafficking and the economic crisis has affected the PAN's popularity at the polls, and the voters' image of the president's leadership ability. It also reviews the central reforms undertaken by president Calderón in 2008, including the overhaul of the judicial system, a minor reform of the public energy sector, and a new set of rules to modernize public education. It then examines internal dynamics of the divided PRD and resurging electoral fortunes of the PRI in many states

Scientific Electronic Library Online (Spanish)

58

Multiple particle break-up study of low excited states in Be-9: The ghost peak in the Be-8 excitation energy spectrum visited

Madurga, Miguel; García Borge, María José; Fynbo, H. O. U.; Jonson, B.; Nyman, G.; Prezado, Yolanda

2 pages, 2 figures.-- PACS nrs.: 23.40.-s; 23.40.Hc; 27.20.+n. | The aim of this work is to find out the origin of the anomalous resonance in Be-8 seen in the reactions through excited states in Be-9. We have populated the Be-9 excited states by beta-decay of Li-9. Energy and direction of the two al...

DRIVER (Spanish)

60

Molecular and compact four-quark states

Vijande, Javier; Valcarce, A.
2010-09-01

Digital.CSIC (Spain)

61

Mapping of the C-12* states via the B-10(He-3,pααα) reaction

García Borge, María José; Alcorta, Martín; Fynbo, H. O. U.; García, G.; Jeppesen, H. B.; Kirsebom, O.

4 pages, 4 figures.-- PACS nrs.: 21.10.-k, 21.10.Hw, 25.55.-e, 27.20.+n. | We have studied C-12 in full kinematics via the B-10(He-3,pααα) reaction at an energy of 2.45 MeV. In our data we have identified states in C-12 from the ground state up to about 18 MeV, with spins ranging from 0 to 4. Due to...

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62

Mapping of the C-12* states via the B-10(He-3,pααα) reaction

García Borge, María José; Alcorta, Martín; Fynbo, H. O. U.; García, G.; Jeppesen, Henrik B.; Kirsebom, O.; Madurga, Miguel; Nyman, G.; Obradors, Diego; Tengblad, Olof
2007-11-01

Digital.CSIC (Spain)

63

Low-temperature inelastic collisions between hydrogen molecules and helium atoms

Tejeda, Guzmán; Thibault, Franck; Fernández Sánchez, José María; Montero, Salvador

11 pages, 12 figures.-- PACS nrs.: 34.50.Ez, 34.20.-b, 33.15.Mt.-- PMID: 18554014 [PubMed]. | Inelastic H(2):He collisions are studied from the experimental and theoretical points of view between 22 and 180 K. State-to-state cross sections and rates are calculated at the converged close-coupling lev...

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64

Long-term simulations of the rotational state of small irregular cometary nuclei

Gutiérrez, Pedro J.; Jorda, L.; Ortiz, J. L.; Rodrigo Montero, Rafael
2003-05-01

Digital.CSIC (Spain)

65

Lateral confinement of surface states on stepped Cu(111)

Sánchez, O.; García, Jorge M.; Segovia, P.; Álvarez, J.; Vázquez de Parga, A. L.; Ortega, J. E.; Prietsch, M.; Miranda, Rodolfo
1995-09-15

Digital.CSIC (Spain)

66

Las golosinas en la alimentación infantil: Análisis antropológico nutricional/ Junk food consumption and child nutrition in Chile

Jackson, Portia; Romo M, Marcela; Castillo A, Marcela; Castillo-Durán, Carlos
2004-10-01

Resumen en inglés The increasing consumption of junk food and snacks in Chile in recent years and its association with marketing strategies and prevalent diseases, is reviewed. In the context of world economy, junk food is a global phenomenon. The availability of junk food and snacks at low prices and marketing has triggered an evolution of consumption of foods that require neither the structure nor the preparation of a formal meal. Many studies have suggested that the increase in snack co (mas) nsumption is associated with an increase in obesity, tooth decay and other chronic diseases among children and adolescents. The hypothesis suggests a link between the pattern of snack consumption and an increase in the energy density of food consumed, a decrease in satiety, passive over consumption, and an increase in obesity. Between 1977 and 1996, the contribution of snacks to daily energy intake among children between 2 and 5 years increased by 30% in the United States. In each age group in Chile, the frequency of non-transmissible chronic diseases is increasing due primarily to a westernized diet that is high in fat, cholesterol, sodium, and sugar and a sedentary lifestyle. Education about junk food consumption and healthy eating habits in the family, starting since childbirth and public policies about healthy lifestyles should be strengthened (Rev Méd Chile 2004; 132: 1235-42)

Scientific Electronic Library Online (Spanish)

67

Kondo Effect in Single Atom Contacts: The Importance of the Atomic Geometry

Vitali, Lucia; Ohmann, Robin; Stepanow, Sebastian; Gambardella, Pietro; Tao, Kun; Huang, Renzhong; Stepanyuk, Valeri S.

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68

Klein tunneling and Dirac potentials in trapped ions

Casanova, Jorge; García-Ripoll, Juan José; Gerritsma, Rene; Roos, Christian F.; Solano, Enrique
2010-08-27

Digital.CSIC (Spain)

70
71

Influence of excitation energy on charged exciton formation in self-assembled InAs single quantum dots

Moskalenko, E. S.; Karlsson, K. F.; Holtz, P. O.; Monemar, B.; Schoenfeld, W. V.; García, Jorge M.; Petroff, P. M.
2001-07-11

Digital.CSIC (Spain)

72

Inelastic collisions in para-H2: Translation-rotation state-to-state rate coefficients and cross sections at low temperature and energy

Maté, Belén; Thibault, Franck; Tejeda, Guzmán; Fernández Sánchez, José María; Montero, Salvador

8 pages, 5 figures.-- PACS nrs.: 34.50 Ez. | We report an experimental determination of the k(00-->02) rate coefficient for inelastic H2:H2 collisions in the temperature range from 2 to 110 K based on Raman spectroscopy data in supersonic expansions of para-H2. For this purpose a more accurate metho...

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73

Inelastic collisions in para-H2: Translation-rotation state-to-state rate coefficients and cross sections at low temperature and energy

Maté, Belén; Thibault, Franck; Tejeda, Guzmán; Fernández Sánchez, José María; Montero, Salvador
2005-02-03

Digital.CSIC (Spain)

75

Identification of yrast high-K intrinsic states in Os-188

Modamio, V.; Jungclaus, A.; Podolyak, Z.; Shi, Y.; Xu, F.R.; Algora, Alejandro; Bazzacco, D.; Escrig, D.; Fraile, L.M.; Lenzi, S.; Marginean, N.; Martinez, T.; Napoli, D. R.; Schwengner, R.; Ur, C. A.
2009-02-17

Digital.CSIC (Spain)

77

Hybridization of electronic states in quantum dots through photon emission

Karrai, Khaled; Warburton, Richard J.; Schulhauser, C.; Högele, A.; Urbaszek, B.; McGhee, E. J.; Govorov, Alexander O.; García, Jorge M.; Gerardot, B. D.; Petroff, Pierre M.
2004-01-08

Digital.CSIC (Spain)

78

Highly excited vibrational states of HCN around 30 000 cm−1

Martínez, R. Z.; Lehmann, Kevin K.; Carter, Stuart
2006-11-06

Digital.CSIC (Spain)

79

Half-metallic finite zigzag single-walled carbon nanotubes from first principles

Mañanes, A.; Duque, F.; Ayuela, Andrés; López, M. J.; Alonso, J. A.

10 pages, 15 figures.-- PACS nrs.: 73.22.-f, 75.75.+a, 72.80.Rj, 85.75.-d. | Density-functional calculations predict half-metallicity in zigzag single-walled carbon nanotubes of finite length with the two ends saturated with hydrogen. We have analyzed the change of the α- and β-spin electronic gaps ...

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80

Fine structure of highly charged quantum dot excitons: turning dark into bright states

Urbaszek, B.; Warburton, Richard J.; Karrai, Khaled; Gerardot, B. D.; Petroff, Pierre M.; García, Jorge M.
2004-02-01

Digital.CSIC (Spain)

81

Fine structure in the beta-delayed proton decay of Ar-33

Honkanen, A.; Axelsson, L.; Äystö, J.; García Borge, María José; Jonson, B.; Jokinen, A.; Martel, Ismael

9 pages, 2 figures, 2 tables.-- PACS nrs.: 21.60.Cs; 23.40.−s; 27.30.+t; 29.30.Ep. | Low-energy beta-delayed protons from Ar-33 have been measured for the first time. The data reveal states, which, despite unfavourable barrier penetrability values, strongly decay to the first excited 2+ state in S-3...

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82

F+OH reactive collisions on new excited 3A'' and 3A' potential-energy surfaces

Gómez Carrasco, Susana; Roncero, Octavio; González-Sánchez, Lola; Hernández, M. Luz; Alvariño, José M.

13 pages, 10 figures, 5 tables.-- PACS nrs.: 82.30.Cf; 82.20.Kh; 82.20.Db; 82.20.Pm. | Global three-dimensional adiabatic potential-energy surfaces for the excited 2(3)A'' and 1(3)A' triplet states of OHF are obtained to study the F(2P)+OH(2Π)O(3P)+HF(1Σ+) reaction. Highly accurate ab initio calcula...

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83

F+OH reactive collisions on new excited 3A'' and 3A' potential-energy surfaces

Gómez Carrasco, Susana; Roncero, Octavio; González-Sánchez, Lola; Hernández, M. Luz; Alvariño, José M.; Paniagua, Miguel; Aguado, Alfredo
2005-09-22

Digital.CSIC (Spain)

84

Exploring the dipole polarizability of Li-11 at REX-ISOLDE

García Borge, María José; Gómez Camacho, Joaquín; Martel, Ismael; Tengblad, Olof
2001-07-16

Digital.CSIC (Spain)

86

Excitons in coupled InAs/InP self-assembled quantum wires

Sidor, Y.; Partoens, B.; Peeters, F. M.; Ben, Teresa; Ponce, Arturo; Molina, Sergio I.; Sales, D. L.; Fuster, David; González, Luisa; González, Yolanda
2007-03-29

Digital.CSIC (Spain)

87

Excitation energy transfer in chlorosomes of Chlorobium phaeobacteroides strain CL1401: the role of carotenoids

Psencik, Jakub; Ma, Ying-Zhong; Arellano, Juan B.; García-Gil, L. Jesús; Holzwarth, Alfred R.; Gillbro, Tomas
2002-11-01

Digital.CSIC (Spain)

88

Exchange-correlation effects on quantum wires with spin-orbit interactions under the influence of in-plane magnetic fields

Malet, Francesc; Pi, Martí; Barranco, Manuel; Serra, Llorenç; Lipparini, Enrico
2007-09-01

Digital.CSIC (Spain)

89

Exactly solvable pairing model for superconductors with px+ipy wave symmetry

Ibáñez, Miguel; Links, Jon; Sierra, Germán; Zhao, Shao-You
2009-05-01

Digital.CSIC (Spain)

90

Exact, Born–Oppenheimer, and quantum-chemistry-like calculations in helium clusters doped with light molecules: The He2N2(X) system

Roncero, Octavio; Lara Castells, M. Pilar de; Delgado Barrio, Gerardo; Villarreal, Pablo; Stoecklin, T.

9 pages, 2 figures, 4 tables.-- PACS nrs.: 34.20.-b; 31.50.-x; 31.15.A-; 33.15.Mt; 33.20.Vq; 36.40.-c. | Helium clusters doped with diatomic molecules, He(N)–BC, have been recently studied by means of a quantum-chemistry-like approach. The model treats He atoms as “electrons” and dopants as “nuclei”...

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91

Estudio teórico de la isomerización del ácido maleico en ácido fumárico: un enfoque basado en el concepto de superficie de energía potencial/ Theoretical study of the isomerization of maleic acid into fumaric acid: an approach based on the concept of potential energy surface

Ugarte, Ricardo; Salgado, Guillermo; Martinez, Rolando; Navarrete, José
2010-01-01

Resumen en inglés A comparative study based on potential energy surfaces (PES) of 2-butanedioic and hypothetic 2-butanedioic/HCl acids is useful for understanding the maleic acid isomerization. The PES enables locating conformers of minimum energy, intermediates of reactions and transition states. From contour diagrams, a set of possible reaction paths are depicted interconnecting the proposed structures. The study was carried out in absentia and in the presence of the catalyst (HCl), usin (mas) g an solvatation model provided by the Gaussian software package. Clearly, the effect of HCl is given by new reaction paths with lower energetic barriers in relation to the reaction without catalyzing.

Scientific Electronic Library Online (Spanish)

92

Energy distributions from three-body decaying many-body Resonances

Álvarez-Rodríguez, Raquel; Jensen, A. S.; Fedorov, D. V.; Fynbo, H. O. U.
2007-08-17

Digital.CSIC (Spain)

93

Electronic potential of a chemisorption interface

Zhao, Jin; Pontius, Niko; Winkelmann, Aimo; Sametoglu, Vahit; Kubo, Atsushi; Borisov, Andrei G.; Sánchez-Portal, Daniel

7 pages, 4 figures.-- PACS nrs.: 73.20.-r. | Chemisorption of atoms and molecules controls many interfacial phenomena such as charge transport and catalysis. The question of how the intrinsic properties of the interacting materials define the electronic structure of their interface remains one of th...

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94

Efficient Energy Transfer from the Carotenoid S2 State in a Photosynthetic Light-Harvesting Complex

Macpherson, Alisdair N.; Arellano, Juan B.; Fraser, Niall J.; Cogdell, Richard J.; Gillbro, Tomas
2001-02-01

Digital.CSIC (Spain)

95

Effective tuning of the charge-state of single In(Ga)As/GaAs quantum dots by below barrier band gap excitation

Karlsson, K. F.; Moskalenko, E. S.; Holtz, P. O.; Monemar, B.; Schoenfeld, W. V.; García, Jorge M.; Petroff, Pierre M.
2003-06-10

Digital.CSIC (Spain)

96

Ecología política de suburbia: límites y retos del ordenamiento territorial estadounidense/ Political ecology of suburbia: limits and challenges of the American land use planning

Delgado-Ramos, Gian Carlo
2008-01-01

Resumen en español La concepción del espacio territorial y su ordenamiento definen en buena medida el funcionamiento de una sociedad, sobre todo, en términos de flujos de materiales y energía. En momentos en que el acceso a combustibles fósiles baratos se deteriora y ante la agudización del calentamiento global, se considera útil la reflexión de cómo se han construido territorialmente las sociedades modernas; en particular la de Estados Unidos (EUA), ciertamente la más despilfarrad (mas) ora del planeta. El presente texto parte, por tanto, de revisar la situación energética-ambiental contemporánea, para luego revisar históricamente el caso de Suburbia, un esquema contemporáneo de construcción espacial-territorial de Estados Unidos que ha tenido como punta de lanza la creciente asfaltización y automovilización del país. Sus consecuencias sociales y ecológicas, entre otras, son analizadas. Se concluye con una valorización de alternativas y retos Resumen en inglés The land use planning conception, defines pretty much a society's performance, above all in terms of energy and material flow. In a time when access to cheap fossil fuels deteriorates and when the phenomena of global warming is becoming deeper, an assessment on how modern societies have been territorially designed and built, is considered useful. This is particularly true for the case of United States, certainly the most wasteful society of the planet. Thus, this paper be (mas) gins with an evaluation of the current energy-environmental condition in order to proceed to historically review the case of Suburbia; the contemporary spatial-territorial construction scheme of United States that has had its foundations on an increasing advancement of the car culture and the building of streets and highways. Suburbia's social and environmental implications, among others, are reviewed. The paper concludes with an appraisal of alternatives and challenges

Scientific Electronic Library Online (Spanish)

97

Direct versus resonances mediated F+OH collisions on a new 3A'' potential energy surface

Gómez Carrasco, Susana; González-Sánchez, Lola; Aguado, Alfredo; Roncero, Octavio; Alvariño, José M.

14 pages, 13 figures, 4 tables.-- PACS nrs.: 82.30.Cf; 82.20.Kh; 31.15.Ar; 82.20.Fd; 33.80.Eh; 31.50.Df. | A theoretical study of the F(2P) + OH(2Π)HF(1Σ+) + O(3P) reactive collisions is carried out on a new global potential energy surface (PES) of the ground 3A'' adiabatic electronic state. The ab ...

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98

Direct versus resonances mediated F+OH collisions on a new 3A'' potential energy surface

Gómez Carrasco, Susana; González-Sánchez, Lola; Aguado, Alfredo; Roncero, Octavio; Alvariño, José M.; Hernández, M. Luz; Paniagua, Miguel
2004-09-08

Digital.CSIC (Spain)

100

Description of single and double analog states in the f7/2 shell: The Ti isotopes

Raduta, A. A.; Zamick, L.; Moya de Guerra, Elvira; Faessler, Amand; Sarriguren, Pedro
2003-10-29

Digital.CSIC (Spain)

103

Competition between adiabatic and nonadiabatic fragmentation pathways in the unimolecular decay of the ArI2(B) van der Waals complex

Roncero, Octavio; Buchachenko, Alexei A.; Lepetit, Bruno

12 pages, 6 figures, 3 tables, 1 appendix.-- PACS nrs.: 34.50.Ez; 33.80.Gj; 33.70.Ca; 33.15.Mt; 31.15.Md; 33.20.Tp. | The competition between vibrational and electronic predissociations of the ArI2(B) van der Waals complex has been studied using several dynamical computational methods: exact quantum...

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104

Communications: a model study on the electronic predissociation of the NeBr2 van der Waals complex

Sanz-Sanz, Cristina; Roncero, Octavio; Hernández-Lamoneda, Ramón; M. Pio, Jordan; A. Taylor, Molly; C. Janda, Kenneth
2010-06-10

Digital.CSIC (Spain)

105

Collisional and photoinitiated reaction dynamics in the ground electronic state of Ca–HCl

Sanz, Cristina; Avoird, Ad van der; Roncero, Octavio

11 pages, 14 figures, 1 table.-- PACS nrs.: 82.30.Cf; 82.50.-m; 82.20.Kh; 82.30.Fi; 82.20.Rp; 82.20.Fd; 33.20.Ea; 33.15.Ry; 33.15.Dj; 82.30.Hk. | Ca+HCl(ν,j) reactive collisions were studied for different rovibrational states of the HCl reactant using wave-packet calculations in reactant Jacobi coor...

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107

Biología molecular de los transportadores de glucosa: clasificación, estructura y distribución

Bermúdez, Valmore; Bermúdez, Fernando; Arraiz, Nailet; Leal, Elliuz; Linares, Sergia; Mengual, Edgardo; Valdelamar, Lisney; Rodríguez, Moisés; Seyfi, Hamid; Amell, Anilsa; Carrillo, Marisol; Silva, Carlos; Acosta, Alejandro; Añez, Johnny; Andara, Carla; Angulo, Verónica; Martins, Gabriela
2007-01-01

Resumen en español Hexosas como la glucosa, galactosa y fructosa cumplen funciones importantes en las células eucarióticas. Estas moléculas son incapaces de difundir directamente a través de las membranas celulares por lo que requieren proteínas transportadoras especializadas para entrar al interior celular. Dichas biomoléculas pertenecen a un grupo de transportadores constituida por 2 familias de proteínas: la familia de los Glut´s (del inglés Glucose Transporters) y la familia de (mas) los co-transportadores de sodio y glucosa. Según la información obtenida de la secuencia de aminoácidos por medio de librerías de cADN todos poseen una estructura básica similar: 12 (Gluts) o 14 (SGLT) dominios trasmembrana. Igualmente todos parecen estar glicosilados en alguna de sus asas extracelulares. En los últimos siete años ha habido un explosivo incremento en la información sobre estos transportadores, de hecho, hasta hace diez años solo se conocían 6 transportadores pero esta familia ha crecido rápidamente hasta llegar a 14 miembros para los Gluts y 6 miembros para los SGLT´s. El impacto de estos descubrimientos se hace notar cuando se analizan los procesos en los que se involucran estas proteínas: Control de la glicemia basal y post-prandial; mecanismos de absorción de la glucosa y fructosa en el intestino delgado; absorción de fructosa en los espermatozoides; reabsorción de glucosa a nivel tubular renal y yeyuno; maduración de la expresión de Glut´s en la mama en lactación; incorporación de glucosa al músculo durante el ejercicio; mecanismo sensor en la secreción de insulina y respuestas adaptativa del metabolismo energético durante estados de estrés, etc. Resumen en inglés Hexoses like glucose, galactose and fructose serve as basic fuel molecules for eucaryotic cells. These molecules are unable to diffuse across cellular membranes, and require transporter proteins for entry into and exit from cells. Three distinct groups of hexose transporters have been identified and classified based on their dependence on cellular energy and its chemistry structure. Each of the transporters has different affinities for glucose and the other hexoses, which (mas) largely dictates their function. The hexose transporters are large integral membrane proteins. Based on the deduced amino acid sequences of their cloned cDNAs, they have similar structures, consisting of 12 or 14 membrane-spanning regions with cytoplasmic C-terminal and N-terminal tails. Also, they all appear to be glycosylated on one of the extracellular loops. Transport of sugars across membranes appears to result from a series of conformational changes which "flips" the transporter between alternate states with the substrate binding site either facing the extracellular or cytoplasmic side of the membrane. Transport in either direction is thus possible, depending on relative substrate concentrations on either side of the membrane. The original protein, GLUT1, was identified in molecular term’s 12 years ago. In the subsequent 15 years, a family of related transporters was identified (GLUTs 1-14). The impact of these discoveries is better realized when we list a sample of the processes that utilize different members of the GLUT family: control of glycemia; insulin dependent glucose utilization; transport pathways in brain neurons and glia; mechanisms of glucose and fructose uptake in the intestinal track; reabsorption of glucose in kidney tubules and jejunum; maturation of transporters during lactation and weaning; sensing of glucose levels by the pancreas and the liver; control of glucose uptake in high fat feeding; glucose uptake in response to exercise, adaptive response of energy metabolism to cellular stress.

Scientific Electronic Library Online (Spanish)

108

Band structure effects on the Be(0001) acoustic surface plasmon energy dispersion

Silkin, Viatcheslav M.; Pitarke, José María; Chulkov, Eugene V.; Diaconescu, B.; Pohl, K.; Vattuone, L.

22 pp.-- PACS nrs.: 71.15.Mb, 71.45.Gm, 73.20.At, 73.20.Mf.-- Pre-print version available at: http://arxiv.org/abs/0806.2364. | We report first-principles calculations of acoustic surface plasmons on the (0001) surface of Be, as obtained in the random-phase approximation of many-body theory. The ene...

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110

An overview on potential energy surfaces of rare-gas dihalogen van der Waals clusters

Delgado Barrio, Gerardo; Prosmiti, Rita; Valdés, Álvaro; Villarreal, Pablo

7 pages, 3 figures, 1 table.-- PACS nrs.: 31.15.A-, 31.50.Bc, 31.50.Df, 33.15.Fm, 33.20.Vq, 36.40.Mr.-- Available online Dec 21, 2005. | In this review we report on interaction potential surface calculations of Rg–XY (Rg = rare gas and X, Y = halogens) van der Waals (vdW) complexes. Experimental dat...

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111

An overview on potential energy surfaces of rare-gas dihalogen van der Waals clusters

Delgado Barrio, Gerardo; Prosmiti, Rita; Valdés, Álvaro; Villarreal, Pablo
2006-01-01

Digital.CSIC (Spain)

112

An inversion technique for the calculation of embedding potentials

Roncero, Octavio; Lara Castells, M. Pilar de; Villarreal, Pablo; Flores, F.; Ortega, J.; Paniagua, Miguel

12 pages, 9 figures.-- PACS nrs.: 31.15.eg; 33.15.Bh; 31.15.xr; 31.15.vn; 31.50.Df; 34.20.Cf. | A new embedding method to include local correlation in large systems is proposed. In this method the density of the whole system, calculated via density functional theory approaches, is partitioned in two...

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113

Adhesión bacteriana a biomateriales/ Bacterial adhesion to biomaterials

Ábalos, C
2005-02-01

Resumen en español En términos generales, para la adhesión bacteriana, influyen cuatro elementos: Material, Microorganismos, antimicrobianos y mecanismos de defensa. La influencia del material es más importante en los estadios iniciales de la adhesión, pudiendo influir el mismo material, su rugosidad o su energía superficial., si es que existe una influencia del material en la adhesión bacteriana, esta reside en las caracteristicas de la película adquirida y en la especificidad de la (mas) s proteinas adsorbidas salivares (receptores), que puedan ser condicionadas por la composición del material o por las características de superficie de este. Resumen en inglés In general terms, there are four elements which influence on bacterial adhesion: the material, the micro organisms, antimicrobials and defence mechanisms. The influence of the material is more relevant at the initial states of adhesion where the proper material, its roughness or its superficial energy can have some influence. If there is some influence of the material in the bacterial adhesion, it relies on the features of the acquired film and on the specificity of the a (mas) dsorved salivary proteins (receptors), which can be influenced by the composition of the material or the characteristics of its surface.

Scientific Electronic Library Online (Spanish)

114

Acceptor-induced threshold energy for the optical charging of InAs single quantum dots

Moskalenko, E. S.; Karlsson, K. F.; Holtz, P. O.; Monemar, B.; Schoenfeld, W. V.; García, Jorge M.; Petroff, P. M.
2002-11-01

Digital.CSIC (Spain)

115

Ab initio vibrational predissociation dynamics of He-I2(B) complex

Valdés, Álvaro; Prosmiti, Rita; Villarreal, Pablo; Delgado Barrio, Gerardo; Lemoine, Didier; Lepetit, Bruno

7 pages, 5 figures, 5 tables.-- PACS nrs.: 31.15.Ar; 31.15.Dv; 33.80.Gj; 33.20.Tp; 33.70.Ca. | Three-dimensional quantum mechanical calculations on the vibrational predissociation dynamics of HeI2 B state complex are performed using a potential energy surface accurately fitted to unrestricted open-s...

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116

Ab initio vibrational predissociation dynamics of He-I2(B) complex

Valdés, Álvaro; Prosmiti, Rita; Villarreal, Pablo; Delgado Barrio, Gerardo; Lemoine, Didier; Lepetit, Bruno
2007-06-29

Digital.CSIC (Spain)

117

Ab initio potential-energy surface for the reaction Ca+HCl --> CaCl+H

Verbockhaven, Gilles; Sanz, Cristina; Groenenboom, Gerrit C.; Roncero, Octavio; Avoird, Ad van der

12 pages, 9 figures, 7 tables.-- PACS nrs.: 31.15.Ar; 82.20.Kh; 33.15.Bh; 34.20.Gj; 31.15.Dv; 33.20.Ea; 33.20.Vq. | The potential-energy surface of the ground electronic state of CaHCl has been obtained from 6400 ab initio points calculated at the multireference configuration-interaction level and r...

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118

Ab initio potential energy surface and spectrum of the B(3Π) state of the HeI2 complex

Valdés, Álvaro; Prosmiti, Rita; Villarreal, Pablo; Delgado Barrio, Gerardo; Werner, Hans-Joachim

9 pages, 6 figures, 4 tables.-- PACS nrs.: 31.15.Ar; 31.50.-x; 33.50.Dq; 33.15.Bh; 31.15.Dv; 33.70.Jg. | The three-dimensional interaction potential for I2(B 3Π0(u)+)+He is computed using accurate ab initio methods and a large basis set. Scalar relativistic effects are accounted for by large-core re...

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119

Ab initio potential energy surface and spectrum of the B(3Π) state of the HeI2 complex

Valdés, Álvaro; Prosmiti, Rita; Villarreal, Pablo; Delgado Barrio, Gerardo; Werner, Hans-Joachim
2007-05-22

Digital.CSIC (Spain)

120

Ab initio calculations, potential representation and vibrational dynamics of He2Br2 van der Waals complex

Valdés, Álvaro; Prosmiti, Rita; Villarreal, Pablo; Delgado Barrio, Gerardo
2005-01-05

Digital.CSIC (Spain)

121

ANÁLISIS DEL CASO DE CHILE EN EL INFORME FAO: ESTADO SOBRE LA INSEGURIDAD ALIMENTARIA EN EL MUNDO, 2004/ ANALYSIS OF THE CHILEAN CASE IN THE FAO REPORT: STATE OF FOOD INSECURITY IN THE WORLD, 2004

Uauy D, Ricardo; Oyarzún M, Maria-Teresa
2005-12-01

Resumen en español En la Cumbre Mundial sobre la Alimentación (CMA) del año 1996, los jefes de estado de 186 países acordaron para el año 2015, reducir al 50% la cantidad de personas que padecen subnutrición en el mundo. Con el propósito de monitorear el avance hacia el cumplimiento de esta meta, la FAO publica desde 1999 «El estado de la inseguridad alimentaria en el mundo», informe que estima año a año la cifra de personas subnutridas, en base a una metodología aplica (mas) da con propósitos comparativos a todos los países sin excepción. La cifra resultante es una estimación y no pretende reemplazar la medición directa del consumo de alimentos provenientes de encuestas poblacionales, o la medición del estado nutricional de los habitantes de un país a partir de medidas antropométricas. En el caso de Chile, al usar esta metodología, el informe SOFI 2004 indica que la proporción de personas subnutridas alcanza un 4% de la población total, es decir, 600.000 personas. Esta cifra amerita un análisis complementario en virtud de que en este país existe información actualizada y representativa de su población, basada en indicadores socioeconómicos, de salud y de estado nutricional. En consecuencia el análisis de esta información nacional, muestra que la cifra de personas subnutridas es comparable al número de personas indigentes, las que evidentemente se encuentran en riesgo de inseguridad alimentaria. Sin embargo, resultados del estado nutricional de la población demuestran elevados índices de sobrepeso y obesidad en los diferentes grupos etéreos, estando la subnutrición más asociada a una dieta inadecuada desde el punto de vista de calidad (adecuación de micronutrientes) y no de cantidad (aporte energético). La primera Encuesta Nacional en Salud (ENS 2003) indica que Chile tiene como mayor manifestación, la carga de enfermedades crónicas relacionadas con la nutrición derivadas del sobrepeso y obesidad, en una población adulta que ha estado sometida a desnutrición temprana, evidenciada por la baja talla. Sugerimos que las políticas alimentario-nutricionales revisen constantemente los programas de alimentación y nutrición dirigidos a la población más vulnerable, para asegurar que ellos respondan a la realidad actual y contribuyan a resolver los problemas nutricionales pendientes de esta población Resumen en inglés At the World Food Conference (WFC) in 1996, 186 chief of states made the compromise to reduce by 50% the amount of people that suffer undernourishment in the world by the year 2015. In order to monitor the accomplishment of this goal, FAO published since 1999 «The State of Food Insecurity in the World», a Report that estimates yearly the amount of undernourished people, based on a methodology applied with comparative purposes to all countries without exception (mas) . The value obtained is an estimation and does not pretend to replace the direct measurement of food consumption obtained from population surveys or analysis of nutritional status of the country population based on anthropometrical measurements. In the case of Chile, using this methodology, SOFI 2004 Report states that the proportion of undernourished population amounts to 4% of the total population or 600.000 people. This figure requires complementary analysis since the country has current information representative from its population, based on socio-economical, health and nutritional status indicators. As a consequence the analysis of these national data indicates that de estimation of undernourished people is comparable with the number of indigent population, who evidently are at risk of food insecurity. However, nutritional status of the population indicates high prevalence of overweight and obesity in all age groups. Undernourishment in Chile is more related to an unhealthy diet from the stand point of quality (nutrient adequacy) and not quantity (energy intake). The first Chilean National Health Survey (NHS 2003) showed that Chile presents mainly a nutrition related burden of chronic diseases. The prevalence of overweight and obesity in the adult population is highest in the groups that experienced early undernutrition, as evidenced by their low height. We suggest that food and nutrition policies be re-examined, in order to better respond to present challenges and to contribute to the solution of pending nutritional problems

Scientific Electronic Library Online (Spanish)

122

A theory of nonvertical triplet energy transfer in terms of accurate potential energy surfaces: The transfer reaction from π,π* triplet donors to 1,3,5,7 -cyclooctatetraene

Andrés, José Luis; Merchán, Manuela; Acuña Fernandez, Alberto Ulises; Frutos, L. M.; Castaño, O.

Triplet energy transfer (TET) from aromatic donors to 1,3,5,7-cyclooctatetraene (COT) is an extreme case of "nonvertical" behavior, where the transfer rate for low-energy donors is considerably faster than that predicted for a thermally activated (Arrhenius) process. To explain the anomalous TET of ...

DRIVER (Spanish)

124

A theoretical study of He2ICl van der Waals cluster

Valdés, Álvaro; Prosmiti, Rita; Villarreal, Pablo; Delgado Barrio, Gerardo

10 pages, 7 figures, 4 tables.-- PACS nrs.: 31.15.Dv; 33.15.Bh; 31.15.Ar; 33.15.Mt. | The structure, energetics, and dynamics of He2ICl complex in its ground state are studied by means of ab initio electronic structure and quantum-mechanical calculations. Interaction energies for selected He2ICl con...

DRIVER (Spanish)

125

A theoretical study of He2ICl van der Waals cluster

Valdés, Álvaro; Prosmiti, Rita; Villarreal, Pablo; Delgado Barrio, Gerardo
2006-07-06

Digital.CSIC (Spain)

126

A theoretical investigation on the spectrum of the Ar trimer for high rotational excitations

Márquez-Mijares, Maykel; Pérez de Tudela, Ricardo; González Lezana, Tomás; Roncero, Octavio; Miret-Artés, Salvador; Delgado Barrio, Gerardo; Villarreal, Pablo; Baccarelli, Isabella; Gianturco, Franco Antonio; Rubayo-Soneira, Jesús
2009-04-15

Digital.CSIC (Spain)

127

A full-configuration interaction "nuclear orbital'' method to study doped 3He(N) clusters (N<=4)

Lara Castells, M. Pilar de; Delgado Barrio, Gerardo; Villarreal, Pablo; Mitrushchenkov, A. O.
2006-12-08

Digital.CSIC (Spain)

128


2003-10-01

Resumen en inglés A recent report that bears the title Physical Activity Among Adults: United States, 2000 describes one of the few studies in the world that quantify total daily energy expenditure among adults in a given population. Most studies that attempt to assess the level of physical activity performed by a country's inhabitants look at leisure-time physical activity or energy expenditures while on the job. By looking at just one of those two areas, such studies provide only a parti (mas) al view of the overall physical activity levels within a population. The report on the adult population of the United States of America, which is based on the National Center for Health Statistic's National Health Interview Survey for the year 2000, draws on data obtained through approximately 39 000 household interviews, covering a total of more than 100 000 individuals from all 50 states. In essence, indicators were developed, based on frequency and duration, for regular leisure-time physical activity (exercise, sports, or active hobbies) as well as for the amount of "usual daily activity" (i.e., commuting, performing household chores, running errands, and engaging in other activities not performed during leisure time). Regular leisure-time physical activity was thus defined as light or moderate activity for a minimum of 30 minutes per session at least five times a week, or intense activity for a minimum of 20 minutes per session at least three times a week. Light or moderate activity was defined as activity lasting at least 10 minutes that caused light sweating and a slight to moderate increase in breathing or heart rate. Vigorous activity was defined as activity lasting at least 10 minutes that caused heavy sweating or large increases in breathing or heart rate. In the case of "usual daily activity," its magnitude was determined by the number of times a day an individual had to walk or to lift or carry light, moderate, or heavy loads. These two indicators-regular leisure-time physical activity and usual daily activity-were combined to obtain an indicator for "overall physical activity level." According to results, 19% of U.S. adults engage in a high level of physical activity, with men being more likely than women to engage in such activity. In both sexes, however, the level of physical activity declines with age, so that adults in the oldest age group (65 or older) were about five times as likely as adults in the youngest age group (18­24 years) to never be physically active. Women were also more likely than men to never engage in physical activity. One in every 4 adults in the United States engages in little physical activity or none. Those who are more active in their usual daily activities are also more likely to engage in regular physical activity during leisure time. Almost three fourths of adults lift or carry light to heavy loads during their usual activities. The report also examines the association between various socioeconomic and demographic variables and physical activity. Adults with incomes below the poverty level are three times more likely to be physically inactive than adults in the highest income group (4 times the poverty level or more). Around 15% of Hispanics, 14% of blacks, and 20% of whites engage in a high level of physical activity. In terms of education, individuals having an advanced degree are almost twice as likely as individuals without a high school diploma to have a high level of physical activity. In short, the report described herein provides an accurate assessment of overall physical activity among U.S. adults and identifies high-risk population subgroups that should be the target of health promotion activities geared toward increasing physical activity levels. The data it includes will be the basis for monitoring progress toward achieving the 2010 national health objectives for physical activity among adults in the United States.

Scientific Electronic Library Online (Spanish)

129

Lara Castells, M. Pilar de; Delgado Barrio, Gerardo; Villarreal, Pablo; Mitrushchenkov, A. O.

4 pages, 1 figure, 2 tables.-- PACS nrs.: 36.40.Cg; 31.25.-v; 33.15.Ry. | An efficient full configuration interaction (FCI) treatment, based on the Jacobi-Davidson algorithm, is developed in order to study small doped 3He(N) clusters. The state of each He atom in a given cluster is described by a se...

DRIVER (Spanish)

130

Estados unidos frente al mundo: entre paradojas y desafíos

GONZÁLEZ DELUCA, MARÍA ELENA
2002-09-01

Resumen en español Resumen La política exterior de Estados Unidos en el siglo XX es analizada en una perspectiva histórica que destaca las tensiones entre los intereses unilaterales de los actores internos y aquellos ligados a los compromisos adquiridos en su carácter de potencia mundial. Hasta el ataque de Pearl Harbor, Estados Unidos no tenía un papel decisivo en la escena mundial y, pese a su gran poder económico y político internacional, la política exterior recibió una atenció (mas) n oportunista, todavía bajo la influencia del aislacionismo. Durante la Guerra Fría, las tensiones se minimizaron, gracias a la política de alianzas contra el comunismo. Esto, sin embargo, no evitó la confrontación en Vietnam y sus consecuencias en la política interna. El cese de la confrontación bipolar dio mayor presión a la agenda interna que se proyectó en los asuntos exteriores sin más obstáculos que los surgidos en las mesas de negociaciones. Así es que en medio de las exigencias del mundo globalizado y pese a los destellos de la diplomacia presidencial de fines del siglo, la visión desde adentro se fortaleció. La focalización de la política exterior alrededor de la lucha contra el terrorismo desde el pasado 11 de septiembre, dio nuevo vigor a las alianzas internacionales, pero hay signos de un rápido desgaste. Resumen en inglés Abstract United States foreign policy in the 20th Century is here analyzed in a historical perspective that highlights the tensions between her unilateral domestic interests and those arising from her external commitments as a superpower. Up until the Pearl Harbor attack, the United States did not have a leading role on the world stage and despite the significance of her economic and political international power, her foreign policy received only opportunistic considerati (mas) on, still shaped by isolationism. During the Cold War those tensions were minimized thanks to the system of alliances in which anti-communism was the common strategy of the western powers. This system did not, however, avert the Vietnam conflict and its consequences on domestic affairs. As the Cold War came to a close the interests of the domestic agenda projected themselves over the global one, even if they had to be negotiated with international partners in the context of globalization. After the events of last September 11th, the focus on antiterrorist actions gave new strength to international alliances, but there are signs that its energy is fast depleting.

Scientific Electronic Library Online (Spanish)