40,476 research outputs found
Consumers’ willingness to pay for biodiesel in Spain
Consumer/Household Economics, Resource /Energy Economics and Policy,
Majorana neutrino oscillations in vacuum
In the context of a type I seesaw scenario which leads to get light
left-handed and heavy right-handed Majorana neutrinos, we obtain expressions
for the transition probability densities between two flavor neutrinos in the
cases of left-handed and right-handed neutrinos. We obtain these expressions in
the context of an approach developed in the canonical formalism of Quantum
Field Theory for neutrinos which are considered as superpositions of
mass-eigenstate plane waves with specific momenta. The expressions obtained for
the left-handed neutrino case after the ultra-relativistic limit is taking lead
to the standard probability densities which describe light neutrino
oscillations. For the right-handed neutrino case, the expressions describing
heavy neutrino oscillations in the non-relativistic limit are different respect
to the ones of the standard neutrino oscillations. However, the right-handed
neutrino oscillations are phenomenologically restricted as is shown when the
propagation of heavy neutrinos is considered as superpositions of
mass-eigenstate wave packets.Comment: 25 pages, abstract changed, two sections added, some references adde
Incorporating Uncertainty and Cero Values into the Valuation of Protected Areas and Species
Under the Spanish conservation law, compensation is envisaged for the damage associated with all actions that reduce the quantity or quality of protected areas and species. This paper provides a tool to evaluate the monetary equivalent of this damage. We conduct a contingent valuation exercise to estimate the existence value related to protected areas and species in Aragon. This estimate is then reconsidered including the possibility of zero bids and also the possibility of uncertain preferences for non-familiar goods. Considering these two effects, mean values are reduced significantly giving support to previous recommendations of dividing by two contingent valuation estimates from dichotomous choice question formats.natural heritage, contingent valuation, Spike model, uncertainty, Land Economics/Use, B23, C24, C42, C52, D62, Q26,
Large-area thin-film modules
The low cost potential of thin film solar cells can only be fully realized if large area modules can be made economically with good production yields. This paper deals with two of the critical challenges. A scheme is presented which allows the simple, economical realization of the long recognized, preferred module structure of monolithic integration. Another scheme reduces the impact of shorting defects and, as a result, increases the production yields. Analytical results demonstrating the utilization and advantages of such schemes are discussed
Platica politico-cristiana
Copia digital. Valladolid : Junta de Castilla y León. Consejería de Cultura y Turismo, 201
Preferencias inciertas y modelo Spike en la valoración del patrimonio natural
Under the Spanish conservation law, compensation is envisaged for the damage associated with all actions that reduce the quantity or quality of protected areas and species. This paper provides a tool to evaluate the monetary equivalent of this damage. First, we conduct a contingent valuation exercise to estimate the existence value related to protected areas and species in Aragon. This first estimate is then reconsidered including in first place the possibility of zero bids and also the possibility of uncertain preferences for non familiar goods. Considering these two effects, mean values are reduced dramatically (more than halved) giving support to previous recommendations of dividing by two contingent valuation estimates from dichotomous choice question formats.Natural heritage; contingent valuation; Spike model; uncertainty
Computer simulation of the microstructure and rheology of semi-solid alloys under shear
The rheological behavior of metallic alloys containing both solid and liquid
phases is investigated in the low solid fraction range (<50%). This behavior
depends on both the solid fraction and the shear rate. The concept of Effective
Volume Fraction (EVF) is used to decorrelate the influence of these two
parameters. At high shear rate the slurry behaves like a suspension of hard
spheres, whereas at lower shear rate, particles tend to aggregate in clusters,
entrapping liquid and thus, increasing the EVF and the viscosity. A lattice
model is introduced to simulate the aggregation / break-up processes within a
slurry under shear. When the steady state is reached, the entrapped liquid
fraction is calculated, leading to a viscosity estimation. Simulation results
for the viscosity and 3D cluster structure are in good agreement with
experimental results.Comment: 30 pages, 17 figures, to be published in Acta Mate
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