On Automorphisms and Focal Subgroups of Blocks

Given a p-block B of a finite group with defect group P and fusion system on P, we show that the rank of the group is invariant under stable equivalences of Morita type. The main ingredients are the construction, due to Broué and Puig, a theorem of Weiss on linear source modules, arguments of Hertweck and Kimmerle applying Weiss’ theorem to blocks, and connections with integrable derivations in the Hochschild cohomology of block algebras

Electromagnetic Calorimeter Calibration with π0\pi^{0}

Several methods can be used in order to achieve precise calibration of the LHCb Electromagnetic Calorimeter (ECAL) once reasonable cell equalization has been reached. At low transverse energy, the standard calibration procedure is an iterative method based on the fit of the $\gamma\gamma$ invariant mass distribution for each cell of the decay $\pi^{0}\to\gamma\gamma$ with resolved photons. A new technique for generating the combinatorial background of such decays directly from data has been developed. Knowledge of the background could allow an alternative calibration method based on a event by event fit of the same $\gamma\gamma$ invariant mass distribution where contributions from groups of cells are considered in a single fit. The background generation procedure and this possible new calibration method are presented in this poster, in addition to an overview of the LHCb Calorimetry system and ECAL calibration techniques

Temporal variability and composition of settling particle fluxes on the Barcelona continental margin (Northwestern Mediterranean)

The results of a year-long sediment-trap experiment provide the first direct observations of sediment fluxes to the seafloor on the Barcelona continental margin. Time-series of vertical particle fluxes and major constituents (organic carbon, biogenic silica, calcium carbonate and aluminosilicates) were determined inside and in the vicinity of the Foix submarine canyon from May 1993 to April 1994. The spatial and temporal variability of bi-weekly total mass fluxes indicate significant high frequency variability related to physical and biological processes at this site. The Foix submarine canyon acts as an actual conduit for transport of sediment from the shelf to the slope, and as a mid-slope sedimentary depocenter. The shelf-slope sediment transfer through this canyon is sporadic and takes place during and immediately after an important storm event or a river discharge increase. During periods of low cross-margin sediment transfer injected through the canyon, the vertical flux of particles is controlled by the along-slope geostrophic circulation. Breaking of the summer water stratification and vertical mixing also appears to be a major process which contributes to increasing the vertical flux of particles. Particle composition inside the Foix submarine canyon does not reflect any significant seasonal variations, but in the adjacent open slope, summer water stratification controls the composition of settling particulate matter. Retention of shelf-derived suspended particles along isopycnals in summer results in a decrease in total mass fluxes and an enrichment of organic carbon and clay mineral content in the settling particulate matter outside the canyon. During the spring biological bloom, the opal content increases particularly on the open slope, but the calcium carbonate does not because the high input of terrigeneous carbonate dominates that from biogenic carbonate production. The aluminosilicates fraction is the largest constituent of the vertical particle fluxes on the Barcelona continental margin, reaching higher percentages inside the Foix submarine canyon

Can You See It?: Providing Visual Arts Access to Audiences with Visual Impairment and Blindness

Senior Project submitted to The Division of Arts of Bard College

Goodness of fit tests for the skew-Laplace distribution

The skew-Laplace distribution is frequently used to fit the logarithm of particle sizes and it is also used in Economics, Engineering, Finance and Biology. We show the Anderson-Darling and Cramér-von Mises goodness of fit tests for this distribution

El actor sindical en la transformación del sistema financiero

El artículo de Julio Puig, investigador de la Escuela Nacional Sindical, El actor sindical en la transformación del sistema financiero, es resultado de una investigación enfocada a demostrar cómo las transformaciones empresariales en el país se han llevado a cabo en detrimento de las organizaciones de los trabajadores.Introducción Las transformaciones del sector financiero y de su mercado de trabajo. Líneas de la transformación de la industria. Líneas de transformación del mercado laboral. El debilitamiento del actor sindical en el sector financiero. La reducción dramática de la afiliación. Cuadro 1: Evolución del empleo y la afiliación sindical. Cambios estructurales contradictorios. Cuadro 2: Evolución de la división/dispersión del sindicalismo. Las prioridades. Los logros y cartas del actor sindical del sector financiero. Intervención en los escenarios nacionales. El impacto de los sindicatos en las remuneraciones Cuadro 3: Gastos de personal por unidad, según presencia o ausencia de sindicatos. Cuadro 4: Reconocimiento de un impacto del sindicalismo (Dos variables dependientes de percepción y tres independientes). Cuadro 5: Influencia de la afiliación sindical, el sexo, la cobertura de las convenciones colectivas y la edad en el reconocimiento del impacto de los sindicatos en las remuneraciones. Cuadro 6: Influencia del sexo y la afiliación sindical en la importancia actual de los sindicatos. Conclusiones Bibliografí

Can we always get the entanglement entropy from the Kadanoff-Baym equations? The case of the T-matrix approximation

We study the time-dependent transmission of entanglement entropy through an out-of-equilibrium model interacting device in a quantum transport set-up. The dynamics is performed via the Kadanoff-Baym equations within many-body perturbation theory. The double occupancy $< \hat{n}_{R \uparrow} \hat{n}_{R \downarrow} >$, needed to determine the entanglement entropy, is obtained from the equations of motion of the single-particle Green's function. A remarkable result of our calculations is that $< \hat{n}_{R \uparrow} \hat{n}_{R \downarrow} >$ can become negative, thus not permitting to evaluate the entanglement entropy. This is a shortcoming of approximate, and yet conserving, many-body self-energies. Among the tested perturbation schemes, the $T$-matrix approximation stands out for two reasons: it compares well to exact results in the low density regime and it always provides a non-negative $< \hat{n}_{R \uparrow} \hat{n}_{R \downarrow} >$. For the second part of this statement, we give an analytical proof. Finally, the transmission of entanglement across the device is diminished by interactions but can be amplified by a current flowing through the system.Comment: 6 pages, 6 figure