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The behavior of Baserca and Llauset dams in the new energetic scenarios

The growing energetic demands are promoting new business strategies in the operating of hydroelectric power plants. These are materialized by increasing the role of the reversible plants to produce high quality energy. This fact becomes in an abrupt and quick variation of the water level of the reservoirs. This influences at the temperature levels in the dams. Furthermore, since the dams have been working for years, temperature registers from them are available. This enlarges the initial hypotheses considered in the project calculation. This paper summarizes the results obtained in the enlargement of the operating system involving the Baserca and Llauset dams. The initial experimental data come from the measurements which have been taken in those dams after 30 years of operation.Postprint (published version

El comportamiento de las presas de Baserca y Llauset en los nuevos escenarios energéticos

Las crecientes demandas energéticas están promoviendo nuevas estrategias comerciales en la explotación de las infraestructuras hidráulicas que se materializan aumentando el protagonismo de los saltos reversibles en la producción de energía. Estos nuevos escenarios dan lugar a operaciones, de embalse y desembalse, más bruscas y frecuentes que pueden alterar, entre otros, los efectos que ocasionan en las estructuras las acciones térmicas durante la explotación. Adicional mente al actuar sobre estructuras con un largo recorrido funcional, se dispone de una información muy completa sobre su comportamiento que complementa y enriquece las hipótesis consideradas en el cálculo durante la fase de proyecto. En esta comunicación se presentan los resultados obtenidos en los análisis realizados en este contexto en las presas bóveda de Baserca y Llauset, el tratamiento de los datos experimentales disponibles después de más de 25 años de funcionamiento satisfactorio y como se han incorporado a los cálculos realizados buscando un equilibrio y una coherencia con las hipótesis utilizadas durante su diseño y construcción.Postprint (published version

Theoretical approach based on Monte-Carlo simulations to predict the cell survival following BNCT

International audienceWe present here a very preliminary work on BNCT Dosimetry. The approach is as follows:A full Monte Carlo calculation is used to separate all dose components and determine the corresponding physical dose fractions with a realistic clinical model.These dose fractions are then used as mixed fields to predict cell-survivals and RBE values for a specific cell-line, thanks to the radiobiological model NanOxTM

Search for supersymmetry with a dominant R-parity violating LQDbar couplings in e+e- collisions at centre-of-mass energies of 130GeV to 172 GeV

A search for pair-production of supersymmetric particles under the assumption that R-parity is violated via a dominant LQDbar coupling has been performed using the data collected by ALEPH at centre-of-mass energies of 130-172 GeV. The observed candidate events in the data are in agreement with the Standard Model expectation. This result is translated into lower limits on the masses of charginos, neutralinos, sleptons, sneutrinos and squarks. For instance, for m_0=500 GeV/c^2 and tan(beta)=sqrt(2) charginos with masses smaller than 81 GeV/c^2 and neutralinos with masses smaller than 29 GeV/c^2 are excluded at the 95% confidence level for any generation structure of the LQDbar coupling.Comment: 32 pages, 30 figure

The Drosophila melanogaster Genetic Reference Panel

A major challenge of biology is understanding the relationship between molecular genetic variation and variation in quantitative traits, including fitness. This relationship determines our ability to predict phenotypes from genotypes and to understand how evolutionary forces shape variation within and between species. Previous efforts to dissect the genotype-phenotype map were based on incomplete genotypic information. Here, we describe the Drosophila melanogaster Genetic Reference Panel (DGRP), a community resource for analysis of population genomics and quantitative traits. The DGRP consists of fully sequenced inbred lines derived from a natural population. Population genomic analyses reveal reduced polymorphism in centromeric autosomal regions and the X chromosome, evidence for positive and negative selection, and rapid evolution of the X chromosome. Many variants in novel genes, most at low frequency, are associated with quantitative traits and explain a large fraction of the phenotypic variance. The DGRP facilitates genotype-phenotype mapping using the power of Drosophila genetics

Limit on Bs0B^0_s oscillation using a jet charge method

A lower limit is set on the B_{s}^{0} meson oscillation parameter \Delta m_{s} using data collected from 1991 to 1994 by the ALEPH detector. Events with a high transverse momentum lepton and a reconstructed secondary vertex are used. The high transverse momentum leptons are produced mainly by b hadron decays, and the sign of the lepton indicates the particle/antiparticle final state in decays of neutral B mesons. The initial state is determined by a jet charge technique using both sides of the event. A maximum likelihood method is used to set a lower limit of \, \Delta m_{s}. The 95\% confidence level lower limit on \Delta m_s ranges between 5.2 and 6.5(\hbar/c^{2})~ps^{-1} when the fraction of b quarks from Z^0 decays that form B_{s}^{0} mesons is varied from 8\% to 16\%. Assuming that the B_{s}^{0} fraction is 12\%, the lower limit would be \Delta m_{s} 6.1(\hbar/c^{2})~ps^{-1} at 95\% confidence level. For x_s = \Delta m_s \, \tau_{B_s}, this limit also gives x_s 8.8 using the B_{s}^{0} lifetime of \tau_{B_s} = 1.55 \pm 0.11~ps and shifting the central value of \tau_{B_s} down by 1\sigma

Measurement of the Bs0^0_s lifetime and production rate with Ds−l+^-_s l^+ combinations in Z decays

The lifetime of the \bs meson is measured in approximately 3 million hadronic Z decays accumulated using the ALEPH detector at LEP from 1991 to 1994. Seven different \ds decay modes were reconstructed and combined with an opposite sign lepton as evidence of semileptonic \bs decays. Two hundred and eight \dsl candidates satisfy selection criteria designed to ensure precise proper time reconstruction and yield a measured \bs lifetime of \mbox{\result .} Using a larger, less constrained sample of events, the product branching ratio is measured to be \mbox{\pbrresult