La anarquista Voltairine de Cleyre y su visión del derecho a la resistencia a través de la violencia

[ES] La violencia ha sido considerada uno de los grandes ejes que explican el devenir de la humanidad desde los comienzos de la ciencia historiográfica. Nos repele y nos atrae, deseamos olvidarla pero no debemos dejar que caiga en el olvido, aparenta estar ligada a momentos históricos concretos pero atraviesa nuestro día a día… Quizás por estas razones la violencia, en todas sus posibles manifestaciones, lejos de ser un tema obsoleto, continúa teniendo un gran potencial como cuestión historiográfica, tal y como muestran las investigaciones que conforman este libro. De la mano de diferentes especialistas, y en un recorrido que va desde la Prehistoria hasta la Edad Contemporánea, este volumen colectivo analiza las violencias históricas desde la antropología física, la historia militar, la iconografía, o la historia de la infancia entre otros puntos de vista. Guerras, conflictos políticos y religiosos y sus significados simbólicos, o la violencia como espectáculo son algunas de las cuestiones que abordan sus páginas. Si bien existen pocos temas que hayan sido más estudiados por la historiografía que la violencia, este libro, fruto del Congreso Internacional La Violencia en la Historia, celebrado en la Universidad de Salamanca en octubre de 2019, es una muestra de que las preguntas históricas nunca se agotan y de que las violencias pasadas deben seguir siendo revisitadas desde nuevos enfoques

Nonlinear quantum optics in the (ultra)strong light-matter coupling

The propagation of $N$ photons in one dimensional waveguides coupled to $M$ qubits is discussed, both in the strong and ultrastrong qubit-waveguide coupling. Special emphasis is placed on the characterisation of the nonlinear response and its linear limit for the scattered photons as a function of $N$, $M$, qubit inter distance and light-matter coupling. The quantum evolution is numerically solved via the Matrix Product States technique. Both the time evolution for the field and qubits is computed. The nonlinear character (as a function of $N/M$) depends on the computed observable. While perfect reflection is obtained for $N/M \cong 1$, photon-photon correlations are still resolved for ratios $N/M= 2/20$. Inter-qubit distance enhances the nonlinear response. Moving to the ultrastrong coupling regime, we observe that inelastic processes are \emph{robust} against the number of qubits and that the qubit-qubit interaction mediated by the photons is qualitatively modified. The theory developed in this work modelises experiments in circuit QED, photonic crystals and dielectric waveguides.Comment: Comments are wellcom

Scattering in the ultrastrong regime: nonlinear optics with one photon

The scattering of a flying photon by a two-level system ultrastrongly coupled to a one-dimensional photonic waveguide is studied numerically. The photonic medium is modeled as an array of coupled cavities and the whole system is analyzed beyond the rotating wave approximation using Matrix Product States. It is found that the scattering is strongly influenced by the single- and multi-photon dressed bound states present in the system. In the ultrastrong coupling regime a new channel for inelastic scattering appears, where an incident photon deposits energy into the qubit, exciting a photon-bound state, and escaping with a lower frequency. This single-photon nonlinear frequency conversion process can reach up to 50\% efficiency. Other remarkable features in the scattering induced by counter-rotating terms are a blueshift of the reflection resonance and a Fano resonance due to long-lived excited statesComment: 5+4 page

One- and two-photon scattering from generalized V-type atoms

The one- and two-photon scattering matrix S is obtained analytically for a one-dimensional waveguide and a point-like scatterer with N excited levels (generalized V -type atom). We argue that the two-photon scattering matrix contains sufficient information to distinguish between different level structures which are equivalent for single-photon scattering, such as a V -atom with N = 2 excited levels and two two-level systems. In particular, we show that the scattering with the V -type atom exhibits a destructive interference effect leading to two-photon Coupled-Resonator-Induced Transparency, where the nonlinear part of the two-photon scattering matrix vanishes when each incident photon fulfills a single-photon condition for transparency

Single photons by quenching the vacuum

Heisenberg's uncertainty principle implies that the quantum vacuum is not empty but fluctuates. These fluctuations can be converted into radiation through nonadiabatic changes in the Hamiltonian. Here, we discuss how to control this vacuum radiation, engineering a single-photon emitter out of a two-level system (2LS) ultrastrongly coupled to a finite-band waveguide in a vacuum state. More precisely, we show the 2LS nonlinearity shapes the vacuum radiation into a nonGaussian superposition of even and odd cat states. When the 2LS bare frequency lays within the band gaps, this emission can be well approximated by individual photons. This picture is confirmed by a characterization of the ground and bound states, and a study of the dynamics with matrix product states and polaron Hamiltonian methods.Comment: 9 pages, 10 figure

Teenage visions of gender violence and couple relations

A través del presente trabajo pretendemos reflejar algunas de las creencias que los/las jóvenes y adolescentes encuestados/as tienen en torno a la violencia y a las relaciones de pareja, poniéndose de manifiesto las distorsiones de las mismas, lo cuál les puede llevar a configurar una relación de pareja no igualitaria, reproducir roles estereotipados legitimados socialmente como masculinos o femeninos y tolerar situaciones de abuso, puesto que no reconocen o minimizan determinadas señales de violencia.Trough this work we want to put forward some of the beliefs that the youngsters and teenagers surveyed share in relation to gender violence and couple relations. Such beliefs show certain distortions that may drive to the configuration of gender discriminatory relationships, the reproduction of socially legitimated male/female stereotypes, and tolerance of abusive situations that make youngsters either minimize or be unable to recognize certain signs of violenc

Phenomenological based model of hydrogen production using an alkaline self-pressurized electrolyzer

© 2019 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.The aim of this work is to develop the phenomenological based modeling of a self-pressurized alkaline electrolyser with the objective of predicting the cross-contamination of the gases produced. A proposed model, built in Matlab®, represents the dynamical evolution in real electrolysers, and anticipates operational variables: level, pressure and all concentrations. Dynamic responses in the concentrations of the electrolytic cell, and variations in both level and pressure at the chamber due to the change in current and diffusivity, are reported. The equations by which the variables can be computed are also presented. The proposed model is ready for the corresponding adjustment of parameters based on experimental measurements taken from an available prototype and through a suitable identification process.Peer ReviewedPostprint (author's final draft

Emergent Causality and the N-photon Scattering Matrix in Waveguide QED

In this work we discuss the emergence of approximate causality in a general setup from waveguide QED -i.e. a one-dimensional propagating field interacting with a scatterer. We prove that this emergent causality translates into a structure for the N-photon scattering matrix. Our work builds on the derivation of a Lieb-Robinson-type bound for continuous models and for all coupling strengths, as well as on several intermediate results, of which we highlight (i) the asymptotic independence of space-like separated wave packets, (ii) the proper definition of input and output scattering states, and (iii) the characterization of the ground state and correlations in the model. We illustrate our formal results by analyzing the two-photon scattering from a quantum impurity in the ultrastrong coupling regime, verifying the cluster decomposition and ground-state nature. Besides, we generalize the cluster decomposition if inelastic or Raman scattering occurs, finding the structure of the S-matrix in momentum space for linear dispersion relations. In this case, we compute the decay of the fluorescence (photon-photon correlations) caused by this S-matrix

Clustering, dispersion and sociodemographics characteristics in the spatial incorporation of Peruvians migrants in Córdoba, Argentina

Analizar los patrones espaciales de la migración peruana en la Ciudad de Córdoba, Argentina y comparar la población nacida en Perú que se encuentra agrupada en clústers con aquella dispersa en la ciudad. Se utilizaron técnicas de estadística espacial y análisis sociodemográfico. En la primera fase se usaron medidas globales de autocorrelación espacial (índice global de Moran) y medidas locales de agrupación espacial para representar clústers de población (Gi* de Getis Ord). En la segunda fase se realiza un análisis sociodemográfico de los clústers de población agrupada y dispersa. Resultados:se sugiere la interacción de dos procesos. En primer lugar, la concentración en zonas específicas de la ciudad de migrantes peruanos en patrones que no son aleatorios. Migrantes más antiguos se encuentran principalmente dispersos en la ciudad mientras migrantes más recientes se encuentran concentrados. En segundo lugar, los migrantes peruanos hombres dispersos tienen una mayor diversificación en cuanto a la estructura ocupacional y una mejor posición socioeconómica que los agrupados. Los patrones observados sugieren que existen diferenciales de género en estos procesos. Las mujeres, tanto las que se encuentran dispersas como las agrupadas, presentan una situación socioeconómica más precaria que los hombres. Esa situación es transversal a la dispersión/concentración en el espacio urbano. Conclusiones:se sugiere que las composiciones de clase, género y la temporalidad de los flujos migratorios articulan las modalidades de incorporación a la sociedad de destino.To analyze the spatial patterns of Peruvian migration in the city of Cordoba, Argentina and to compare the Peruvian migrants in clusters with Peruvian migrants scattered in the city. Spatial statistical techniques and socio-demographic analysis are used for this analysis. In the first phase, global measures of spatial autocorrelation (Global Moran Index) and local measures of spatial clustering represent clusters of population (Getis-Ord Gi*). In the second phase, a sociodemographic analysis of population in clusters and population dispersed is carried out. Results:we suggest there are two entangled processes. First, the concentration in specific areas of the city of Peruvian migrants in patterns that are not random. Older migrants are mainly dispersed in the city while more recent migrants are concentrated. Second, dispersed Peruvian men have greater diversification in terms of occupational structure and better socioeconomic status than Peruvian migrants dispersed. Women both dispersed and in clusters have a more precarious economic situation than men. This situation is transversal to the dispersion / concentration in urban space. It is suggested that the composition of class, gender and temporality of migration flows articulate the modalities of incorporation in the society of destination.Fil: Gómez, Pablo Martín Sebastian. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones y Estudios sobre Cultura y Sociedad. Universidad Nacional de Córdoba. Centro de Investigaciones y Estudios sobre Cultura y Sociedad; ArgentinaFil: Sánchez Soria, David. Asociación Ecuatoriana de Estudios de Población; Ecuado