Constraint algorithm for k-presymplectic Hamiltonian systems. Application to singular field theories

The k-symplectic formulation of field theories is especially simple, since only tangent and cotangent bundles are needed in its description. Its defining elements show a close relationship with those in the symplectic formulation of mechanics. It will be shown that this relationship also stands in the presymplectic case. In a natural way, one can mimick the presymplectic constraint algorithm to obtain a constraint algorithm that can be applied to k-presymplectic field theory, and more particularly to the Lagrangian and Hamiltonian formulations of field theories defined by a singular Lagrangian, as well as to the unified Lagrangian-Hamiltonian formalism (Skinner--Rusk formalism) for k-presymplectic field theory. Two examples of application of the algorithm are also analyzed

Draft genome of Haloarcula rubripromontorii strain SL3, a novel halophilic archaeon isolated from the solar salterns of Cabo Rojo, Puerto Rico.

The genus Haloarcula belongs to the family Halobacteriaceae which currently has 10 valid species. Here we report the draft genome sequence of strain SL3, a new species within this genus, isolated from the Solar Salterns of Cabo Rojo, Puerto Rico. Genome assembly performed using NGEN Assembler resulted in 18 contigs (N50 = 601,911 bp), the largest of which contains 1,023,775 bp. The genome consists of 3.97 MB and has a GC content of 61.97%. Like all species of Haloarcula, the genome encodes heterogeneous copies of the small subunit ribosomal RNA. In addition, the genome includes 6 rRNAs, 48 tRNAs, and 3797 protein coding sequences. Several carbohydrate-active enzymes genes were found, as well as enzymes involved in the dihydroxyacetone processing pathway which are not found in other Haloarcula species. The NCBI accession number for this genome is LIUF00000000 and the strain deposit number is CECT9001

Audio-Visual Automatic Speech Recognition Towards Education for Disabilities

Education is a fundamental right that enriches everyone’s life. However, physically challenged people often debar from the general and advanced education system. Audio-Visual Automatic Speech Recognition (AV-ASR) based system is useful to improve the education of physically challenged people by providing hands-free computing. They can communicate to the learning system through AV-ASR. However, it is challenging to trace the lip correctly for visual modality. Thus, this paper addresses the appearance-based visual feature along with the co-occurrence statistical measure for visual speech recognition. Local Binary Pattern-Three Orthogonal Planes (LBP-TOP) and Grey-Level Co-occurrence Matrix (GLCM) is proposed for visual speech information. The experimental results show that the proposed system achieves 76.60 % accuracy for visual speech and 96.00 % accuracy for audio speech recognition

Constraint algorithm for k-presymplectic hamiltonian systems: application to singular field theories

The k-symplectic formulation of field theories is specially simple, since only tangent and cotangent bundles are needed in its description. Its defining elements show a close relationship with those in the symplectic formulation of mechanics. It will be shown that this relationship also stands in the presymplectic case. In a natural way, one can mimick the presymplectic constraint algorithm to obtain a constraint algorithm that can be applied to k-presymplectic field theory, and more particularly to the Lagrangian and Hamiltonian formulations of field theories defined by a singular Lagrangian, as well as to the unified Lagrangian–Hamiltonian formalism (Skinner–Rusk formalism) for k-presymplectic field theory. Two examples of application of the algorithm are also analyzed

Terroir and vintage discrimination of Malbec wines based on phenolic composition across multiple sites in Mendoza, Argentina

ARTÍCULO PUBLICADO EN REVISTA EXTERNA. This study evaluated the phenolic profiles of Malbec wines made from grapes of 23 parcels distributed in 12 geographical indications (GIs) from Mendoza, Argentina. Wines were elaborated under standardized winemaking conditions over three consecutive vintages (2016–2018). Data discriminated wines from different GIs and parcels, based on an integrative data analysis by chemometric tools. Vintage effect and specific phenolic compounds were associated with some GIs or parcels. As well, regional climate conditions allowed partial discrimination of the GIs (and also some parcels). A random forest analysis correctly identified 11 out of 23 individual parcels across the different vintages. The most notorious compounds associated with such classification were p-coumaric acid, delphinidin-3-O-glucoside, caffeic acid, quercetin and peonidin-3-O-glucoside. The presented research allows to individualize, through phenolic profiles, parcels with unique characteristics over years. This is the first report characterizing Malbec wines coming from several GIs (and individual parcels) in different vintages. These results are strongly related to terroir features of wines, contributing to a better communication to consumers and to position Argentinean wines

Walker-like domain wall breakdown in layered antiferromagnets driven by staggered spin–orbit fields

Funder: STSM grant: COST Action CA17123AbstractWithin linear continuum theory, no magnetic texture can propagate faster than the maximum group velocity of the spin waves. Here, by atomistic spin dynamics simulations and supported by analytical theory, we report that a strongly non-linear transient regime due to the appearance of additional magnetic textures results in the breaking of the Lorentz translational invariance. This dynamical regime is akin to domain wall Walker-breakdown in ferromagnets and involves the nucleation of an antiferromagnetic domain wall pair. While one of the nucleated domain walls is accelerated beyond the magnonic limit, the remaining pair remains static. Under large spin–orbit fields, a cascade of multiple generation and recombination of domain walls are obtained. This result may clarify recent experiments on current pulse induced shattering of large domain structures into small fragmented domains and the subsequent slow recreation of large-scale domains.</jats:p

Apps móviles como herramientas de apoyo al aprendizaje matemático informal en Educación Superior

La tecnología móvil, hoy emergente en espacios educativos, comienza a utilizarse como herramienta didáctica para los procesos formativos de los estudiantes. Es por ello que requiere de manera impostergable la renovación de los paradigmas educativos predominantes. Apuntalar la construcción de conocimientos matemáticos de los alumnos mediante herramientas de su uso cotidiano, puede considerarse una metodología de autorregulación de su propio proceso de aprendizaje. En este artículo se presenta una experiencia educativa piloto de desarrollo, contextualizada en el ámbito de Educación Superior, de aplicaciones matemáticas sobre dispositivos móviles, que promueve estrategias de formación, evaluación y control de resultados de problemas matemáticos, fomentando la comprensión de procedimientos y la integración de la resolución analítica manual con la tecnología m-learning.Red de Universidades con Carreras en Informática (RedUNCI

Estudio del comportamiento físico y mecánico del diseño de mezcla asfáltica en caliente adicionando cal hidratada, Av. San Diego, 2021

El presente trabajo de investigación tuvo como objetivo, determinar el comportamiento físico y mecánico en el diseño de la mezcla asfáltica en caliente adicionando cal hidratada – Av. San Diego, 2021, la cual busca promover nuevas alternativas para mejorar su desempeño de las mezclas asfálticas en caliente, la investigación se realizó en la ciudad de lima en el distrito de San Martín de Porres en la Av. San Diego, el diseño de investigación es experimental, de tipo aplicada, nivel explicativa y con enfoque cuantitativa. La cal hidratada añadida se emplea para mejorar sus propiedades físicas y mecánicas; se empleó un cemento asfáltico 60/70 para para la fabricación de cada briqueta con los porcentajes de 0%,1%,1.5% y 3% de cal hidratada; mediante el ensayo de Marshall que es el más conocido y representativo, la proporción de mezcla es de 40% de agregado grueso, fino 60% con una gradación MAC-2, el contenido de vacíos decrece con el porcentaje óptimo de cal hidratada al 1% en 7.50%, la densidad de la mezcla se incrementa en 0.62%, para la propiedad mecánica; la estabilidad se incrementa en 4.6%, flujo 2.33%; más que el patrón 0%, para la prueba de inmersión – compresion, se determinó que el índice de resistencia retenida entre el diseño patrón y modificado presenta un incremento del 10.43%, concluyendo que mejora el contenido de vacíos, densidad, deformación y se incrementa los esfuerzos máximos, resultando ser menos susceptible a perder resistencia por efecto del agua, los valores van acorde a los parámetros establecidos por el manual de E.G -2013 MTC