Nonlinear fiber gyroscope for quantum metrology

We examine the performance of a nonlinear fiber gyroscope for improved signal detection beating the quantum limits of its linear counterparts. The performance is examined when the nonlinear gyroscope is illuminated by practical field states, such as coherent and quadrature squeezed states. This is compared with the case of more ideal probes such as photon-number states.Comment: 8 pages, 1 figur

Staurosira magallanesica, a replacement name for Staurosira patagonica

Staurosira patagonica M.L.Garcia, Maidana, Ector & E.Morales described a new species found in material of Maar Magallanes, Patagonia, Argentina and other lakes in southern Patagonia. This new species was analysed in detail by light and electron microscopy and a comprehensive description is given in Garcia et al. (2017: 107, 114, figs 2-45). However, this name is a later homonym of Staurosira patagonica Cleve, 1882. If we compare our species to Cleve’s illustration (Cleve 1882: pl. 16: fig. 13), we can easily differentiate the two by their general valve outline and morphometric data. As pointed out by Garcia et al. (2017), re-examination of the type material of members of the Fragilariaceae is needed to confirm identities, establish taxonomic boundaries and to facilitate identification, and this is also the case with Staurosira patagonica Cleve. A new name is, however, required for Staurosira patagonica M.L.Garcia, Maidana, Ector & E.Morales as it is an illegitimate name: Staurosira magallanesica M.L.Garcia, Maidana, Ector & E.Morales nom. nov. Replaced synonym: Staurosira patagonica M.L.Garcia, Maidana, Ector & E.Morales Nova Hedwigia, Beiheft 146: 107, 114, figs 2-45, 2017, nom illeg., non Staurosira patagonica Cleve 1882 Öfversigt af Kongliga Svenska Vetenskaps-Akademiens Förhandlingar 38(10): 13, pl. 16: fig. 13, 1882 ‘1881’. Etymology: we have derived the specific epithet from the name of the paleolake Maar Magallanes where this new species was found for the first time by N.I. Maidana (Maidana & Corbella 1997).Fil: García, María Luján. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Biodiversidad y Biología Experimental; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Biodiversidad y Biología Experimental y Aplicada. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Biodiversidad y Biología Experimental y Aplicada; ArgentinaFil: Maidana, Nora Irene. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Biodiversidad y Biología Experimental; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Biodiversidad y Biología Experimental y Aplicada. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Biodiversidad y Biología Experimental y Aplicada; ArgentinaFil: Ector, Luc. Luxembourg Institute of Science and Technology; LuxemburgoFil: Morales, E. A.. Universidade de Évora; Portuga

Guía de utilización de recursos TIC para el Bloque II: Números del Currículo de Matemáticas de Educación Primaria

Internet offers many lists of interactive resources; however, it is difficult to find analysis or guides for using interactive applications for teaching Mathematics. This Final Degree Project, framed in the modality of theoretical revision, has as its objective the analysis and selection of interactive materials for the teaching of Block II: Numbers of the curriculum of Mathematics in Primary Education. For this reason, the internet has been used for a systematic review of educational resources, paying attention to those in which the mathematical motive is enough solid to attract the attention of the students. The initial analysis concludes with the selection of six sources of interactive mathematical resources, from which eight classified applications are extracted as they are used to acquire or crystallize mathematical concepts related to Block II: Numbers. Each resource has examples of use within the classroom turning this work into a brief guide of Mathematical applications that saves time to those teachers who want to make use of these interactive Mathematical resources.En internet abundan las listas de recursos interactivos, sin embargo, resulta complicado encontrar análisis o guías de utilización de aplicaciones interactivas para la enseñanza de las Matemáticas. El presente Trabajo de Fin de Grado, enmarcado en la modalidad de revisión teórica, tiene como objetivo el análisis y la selección de materiales interactivos para la enseñanza del Bloque II: Números del currículum de las Matemáticas en Educación Primaria. Por ello, se ha realizado una revisión sistemática de recursos educativos a través de internet atendiendo a aquellos en los que el motivo matemático sea lo suficientemente sólido para poder captar la atención del alumnado. El análisis inicial concluye con la selección de seis fuentes de recursos matemáticos interactivos, de las cuales se extraen a su vez ocho aplicaciones clasificadas según se utilicen para adquirir o cristalizar conceptos matemáticos relacionados con el Bloque II: Números. Cada recurso cuenta con ejemplos de uso dentro del aula convirtiendo este trabajo en una breve guía de aplicaciones Matemáticas que ahorra tiempo a aquellos docentes que quieren hacer uso de estos recursos matemáticos interactivos

Boundary conditions effects by Discontinuous Galerkin solvers for Boltzmann-Poisson models of electron transport

In this paper we perform, by means of Discontinuous Galerkin (DG) Finite Element Method (FEM) based numerical solvers for Boltzmann-Poisson (BP) semiclassical models of hot electronic transport in semiconductors, a numerical study of reflective boundary conditions in the BP system, such as specular reflection, diffusive reflection, and a mixed convex combination of these reflections, and their effect on the behavior of the solution. A boundary layer effect is observed in our numerical simulations for the kinetic moments related to diffusive and mixed reflection.Comment: appears in Computational Electronics (IWCE), 2014 International Workshop on, Paris, France. (2014). IEEE Xplore Digital Library 6865873.pd

Entropy-stable positivity-preserving DG schemes for Boltzmann-Poisson models of collisional electronic transport along energy bands

This work develops entropy-stable positivity-preserving DG methods as a computational scheme for Boltzmann-Poisson systems modeling the pdf of electronic transport along energy bands in semiconductor crystal lattices. We pose, using spherical or energy-angular variables as momentum coordinates, the corresponding Vlasov Boltzmann eq. with a linear collision operator with a singular measure modeling the scattering as functions of the energy band. We show stability results of semi-discrete DG schemes under an entropy norm for 1D-position 2D-momentum, and 2D-position 3D-momentum, using the dissipative properties of the collisional operator given its entropy inequality, which depends on the whole Hamiltonian rather than only the kinetic energy. For the 1D problem, knowledge of the analytic solution to Poisson and of the convergence to a constant current is crucial to obtain full stability. For the 2D problem, specular reflection BC are considered in addition to periodicity in the estimate for stability under an entropy norm. Regarding positivity preservation (1D position), we treat the collision operator as a source term and find convex combinations of the transport and collision terms which guarantee the positivity of the cell average of our numerical pdf at the next time step. The positivity of the numerical pdf in the whole domain is guaranteed by applying the natural limiters that preserve the cell average but modify the slope of the piecewise linear solutions in order to make the function non-negative. The use of a spherical coordinate system $\vec{p}(|\vec{p}|,\mu=cos\theta,\varphi)$ is slightly different to the choice in previous DG solvers for BP, since the proposed DG formulation gives simpler integrals involving just piecewise polynomial functions for both transport and collision terms, which is more adequate for Gaussian quadrature than previous approaches.Comment: Preprint. The first author acknowledges discussions with Eirik Endeve and Cory Hauck during the time he spent visiting them at ORNL (restricted to positivity preservation, appearing on arXiv:1711.03949) on a trip paid by the kinet grant NSF-RNMS DMS-1107465. V2 is a replacement for V1. V2 has added some references and corrected typos (not affecting any of the calculations

Plasma cholesteryl ester fatty acids do not mediate the association of ethnicity with type 2 diabetes: results from the HELIUS study

Scope: Ethnic minority groups have a higher risk of type 2 diabetes (T2D) than the host population. Our aim was to identify whether plasma cholesteryl ester fatty acids (CEFA) mediate the ethnic differences in type 2 diabetes. Methods and results: We included 202 Dutch, 206 South-Asian Surinamese, 205 African Surinamese, 215 Turkish and 213 Moroccan origin participants of the HELIUS study (Amsterdam, the Netherlands). Logistic regression was used to determine the associations between plasma CEFA and T2D. Mediation analysis was used to identify whether CEFA contributed to the association between ethnicity and T2D. We adjusted for ethnicity, age, sex, smoking, physical activity and BMI. Associations between plasma CEFA and T2D were similar across all ethnic groups. Although differences in plasma CEFA across ethnic groups were observed, CEFA did not mediate the differences in T2D prevalence between ethnic groups. Conclusion: Although ethnic differences in plasma CEFA were found and CEFA were associated with T2D, CEFA did not contribute to the difference in T2D prevalence between ethnic groups. If confirmed, this implies that maintenance of the more beneficial CEFA profiles in the non-Dutch ethnic groups may be encouraged to prevent an even higher prevalence of T2D in these groups

Diatom record of the last 1400 years in Laguna Pululos Jujuy, Argentina

En este trabajo se presenta información paleoambiental de alta resolución cronológica (multi-decadal) de los últimos 1400 años para el sector noroeste de la Puna seca de la provincia de Jujuy (Argentina). Esta información fue obtenida a partir del análisis de la composición de los ensambles de diatomeas recuperados de un testigo del fondo de la Laguna Pululos (22º32’43’’ S; 66º48’25’’ O), un cuerpo de agua somero localizado a 4557 m.s.n.m. Se describen y discuten los resultados de este análisis y las tendencias paleoambientales observadas en relación a las características y cronologías de la anomalía climática medieval (ACM) y de la pequeña edad de hielo (PEH). Entre los años 800 y 1500 DC se habrían instalado marcadas condiciones de aridez, seguidas por lapsos más húmedos que se prolongaron hasta fines del siglo XIX. Se destacan dos períodos: entre 800 y 600 DC (la fase más húmeda de los últimos 1400 años) y entre 1366 y 1463 DC (especialmente árido). Si bien la Laguna Pululos habría atravesado etapas con características asimilables a las del ACM y a las de la PEH, diferiría con el hemisferio norte en cuanto a su cronología, presentando una duración mayor de las condiciones de aridez de la ACM respecto a otros sitios estudiados en los Andes.This paper presents high-resolution (multi-decadal) paleoenvironmental data of the last 1400 years in the northwestern sector of the dry Puna, Jujuy Province (Argentina). This information results from the analysis of the diatom assemblies recovered from sediment core samples collected at Laguna Pululos (22º32’43’’ S; 66º48’25’’ W), a shallow lake located at 4557 m.a.s.l. In this work we present and discuss the main results regarding the species composition of the diatom assemblages, and the observed paleoenvironmental trends related to the main characteristics and chronology of the medieval climatic anomaly (MCA) and little ice age (LIA). The results of the study indicate the onset of very arid conditions between ~800 and 1500 AD, and a sharp change to moister conditions from the latter period until the end of the XIX century. Noteworthy, two periods could be recognized, one between 600 and 800 AD (the moistest phase of the last 1400 years), and between 1366 and 1463 AD (a particularly arid phase). These periods recorded in Laguna Pululos apparently shared characteristics with the MCA and LIA, although, showing differences with chronologies found in the North Hemisphere, with an extended span of the arid conditions during the MCA in comparison with other paleoenvironmental records of the Andes.Fil: Morales, Marcelo Raul. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Biodiversidad y Biología Experimental y Aplicada. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Biodiversidad y Biología Experimental y Aplicada; ArgentinaFil: Bustos, Sabrina. Universidad de Buenos Aires. Facultad de Cs.exactas y Naturales. Departamento de Biodiversidad y Biología Experimental. Laboratorio de Diatomeas Continentales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Maidana, Nora Irene. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Biodiversidad y Biología Experimental y Aplicada. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Biodiversidad y Biología Experimental y Aplicada; Argentin