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Search Results: 1 - 10 of 148020 matches for " August Vidal B "
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Amadeo Muntané S,August Vidal B,Carlos Valencia C,Rosa Cambra M
Revista Chilena de Radiología , 2009,
Representations of Spacetime Alternatives and Their Classical Limits
August W. Bosse,James B. Hartle
Physics , 2005, DOI: 10.1103/PhysRevA.72.022105
Abstract: Different quantum mechanical operators can correspond to the same classical quantity. Hermitian operators differing only by operator ordering of the canonical coordinates and momenta at one moment of time are the most familiar example. Classical spacetime alternatives that extend over time can also be represented by different quantum operators. For example, operators representing a particular value of the time average of a dynamical variable can be constructed in two ways: First, as the projection onto the value of the time averaged Heisenberg picture operator for the dynamical variable. Second, as the class operator defined by a sum over those histories of the dynamical variable that have the specified time-averaged value. We show both by explicit example and general argument that the predictions of these different representations agree in the classical limit and that sets of histories represented by them decohere in that limit.
The Effects of Food Neophobia and Food Neophilia on Diet and Metabolic Processing  [PDF]
August Capiola, Bryan Raudenbush
Food and Nutrition Sciences (FNS) , 2012, DOI: 10.4236/fns.2012.310183
Abstract: Past research shows that food neophobics (those individuals reluctant to try novel foods) and food neophilics (those individuals overtly willing to try novel foods) differ in terms of sensory evaluations, psychophysical ratings, stimulus sampling, physiological responses, and genetic predispositions. The present study assessed whether such factors had an effect on participants’ dietary consumption and subsequent nutritional adequacy. One hundred and sixteen participants, aged 18 - 76 years, completed a food diary for three days as well as several eating-related questionnaires. Nutritional summaries and questionnaire scores were subjected to a multivariate analysis of covariance (MANCOVA) with participants being sorted into three groups depending on their Food Neophobia Score. These three groups consisted of food neophobics, average individuals, and food neophilics. Groups were found to differ significantly on dietary intake of 20 specific nutritional and caloric items, with food-neophobics typically having the lowest intake. Implications support the initial hypothesis of food neophobics having less nutritionally plentiful diets than food neophilics, thus leading food neophobics to have a nutritionally deficient diet. This finding is important since decrease in nutritional intake can result in health related deficiencies.
Providing Biodiversity and Ecosystem Services through Common Pool Resource Management as Hybrid Institution: On Eco-Net Advances and Payments for ESS in Cultural Landscapes  [PDF]
Ernst-August Nuppenau
Natural Resources (NR) , 2017, DOI: 10.4236/nr.2017.87031
Abstract: In many rural areas the management of natural resources is confronted with the tragedy of the common problem; not only historically but also in modern times. Especially where biodiversity loss appears and ecosystem services (ESS) decline, the lack of public management might be related to inappropriate institutional setups. Two distinct directions of thought prevail on the subject. On one hand, proponents of property rights and minimal state intervention eagerly analyse the feat of modern institutions and view private property and payments for ecosystem services (PES) as solution. On the other hand, common pool resource management (CPM) has regained interest because nature is not a straight commodity and cooperation in ESS provision is needed (partly also to facilitate PES). In this paper, the two aspects are combined in a hybrid institution. We suggest a new way of approaching institutional questions in ESS provision as synthesis of private and publically controlled ESS provision. It is contemplated as ESS governance of local eco-nets given the potential for inclusion of public management. In principle, the result is a controlled framework of land sharing between farm land (private ownership) and communally managedland (public ownership). Some land is devoted to hedges, wetlands, etc. Land is an immobile resource and can be used for EESs based on planned species prevalence, whereas communities compete also for labour which can move (or not). Governance is acting in competing constituencies and is a mean to control the regulating entities (public ESS management). At a meta-level we combine the need for public management with advantages of a competitive neo-classical framework. This contribution to CPM investigates a model of a group whose well-being is based on ESS provision in a cultural landscape. By statutory regulations, land (field margins), is ex-tracted from farms for ESS; in particular a leader (called reeve) guides farmers. Two institutions are compared: (1) labour in public land for ESS based farming (i.e.?it is controlled by public authority), or (2) it can migrate seeking higher rents in neighbouring communities.
Study of the dynamic behaviour of the Sancti Petri Channel, southwest coast of Spain
Vidal J.,Tejedor B.
Ciencias marinas , 2005,
Abstract: The dynamic behaviour of the Sancti Petri tidal channel (southwest coast of Spain), which is open at both ends and connected to water bodies with different dynamic characteristics (Atlantic Ocean and Cádiz Bay), is studied herein. This singular estuary is characterized by double inflow-outflow extremes, the tide penetrating almost simultaneously through both ends with a small difference of amplitude. For this study, sea level recordings were obtained from different points throughout the channel and the corresponding harmonic constituents were determined. The results show that the phases of the semidiurnal tides increase from the mouths to a zone located in the vicinity of the channel’s halfway point, while their amplitudes increase from the Atlantic Ocean to Cádiz Bay along the channel. A one-dimensional numerical model with geometry that is representative of the channel was used to reproduce the features observed for the semidiurnal and diurnal tidal constituents. The data supplied by the model were verified with values obtained at strategically chosen sites of the inner domain. The model developed may be used for operational predictions of tides in the study area, especially for the ports of Gallineras and Sancti Petri.
Strongly correlated hopping and many-body bound states
J. Vidal,B. Doucot
Physics , 2001, DOI: 10.1103/PhysRevB.65.045102
Abstract: We study a system in which the quantum dynamics of electrons depend on the particle density in their neighborhood. For any on-site repulsive interaction, we show that the exact two-body and three-body ground states are bound states. We also discuss the finite density case in a mean-field framework and we show that the system can undergo an unusual transition from an effective attractive interaction to a repulsive one, when varying the electron density.
Pairing of Cooper Pairs in a Fully Frustrated Josephson Junction Chain
B. Doucot,J. Vidal
Physics , 2002, DOI: 10.1103/PhysRevLett.88.227005
Abstract: We study a one-dimensional Josephson junction chain embedded in a magnetic field. We show that when the magnetic flux per elementary loop equals half the superconducting flux quantum $\phi_0=h/2e$, a local $\nbZ_2$ symmetry arises. This symmetry is responsible for a nematic Luttinger liquid state associated to bound states of Cooper pairs. We analyze the phase diagram and we discuss some experimental possibilities to observe this exotic phase.
Cosmological Parameters from Observations of Galaxy Clusters
Steven W. Allen,August E. Evrard,Adam B. Mantz
Physics , 2011, DOI: 10.1146/annurev-astro-081710-102514
Abstract: Studies of galaxy clusters have proved crucial in helping to establish the standard model of cosmology, with a universe dominated by dark matter and dark energy. A theoretical basis that describes clusters as massive, multi-component, quasi-equilibrium systems is growing in its capability to interpret multi-wavelength observations of expanding scope and sensitivity. We review current cosmological results, including contributions to fundamental physics, obtained from observations of galaxy clusters. These results are consistent with and complementary to those from other methods. We highlight several areas of opportunity for the next few years, and emphasize the need for accurate modeling of survey selection and sources of systematic error. Capitalizing on these opportunities will require a multi-wavelength approach and the application of rigorous statistical frameworks, utilizing the combined strengths of observers, simulators and theorists.
Tumor de Abrikossoff Abrikossoff tumor
Mireia Melero Luque,Carlos D. Arranz-Obispo,Antonio Monner-Diéguez,August Vidal-Bel
Revista Espa?ola de Cirugía Oral y Maxilofacial , 2011,
Cuál sería su diagnóstico? What would your diagnosis be?
Mireia Melero-Luque,Carlos D. Arranz-Obispo,Antonio Monner-Diéguez,August Vidal-Bel
Revista Espa?ola de Cirugía Oral y Maxilofacial , 2011,
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