Two new species of Antarctic gorgonians (Octocorallia: Primnoidae) with a redescription of Thouarella laxa Versluys, 1906

Two new species of the genus Thouarella from Antarctic waters are described and illustrated from material collected on the Polarstern cruises ANT XVII/3 (EASIZ III), ANT XIX/5 (LAMPOS) and ANT XXI/2 (BENDEX). On the one hand, Thouarella viridis sp. nov. is placed in the subgenus Epithouarella due to the characteristic ornamentation of its marginal scales (the previously most recent species in this group was included by Ku¨kenthal in Zool Anz 33(1): 9–20, 1908). On the other hand, Thouarella minuta sp. nov. is included in subgenus Thouarella among the 14 species currently recognised, the main distinct feature being tiny polyps. Furthermore, a complete redescription is given of Thouarella laxa Versluys, 1906. Using the new technology available nowadays, such as images obtained with SEM, we provide accurate images of the polyps and sclerites. In addition, as a result of this study, T. laxa and its closest congener T. tydemani Versluys, 1906 are maintained as separate species, mainly due to their internal sculpture of body and coenenchymal scales

Electron-phonon vertex and its influence on the superconductivity of two-dimensional metals on a piezoelectric substrate

We investigate the interaction between the electrons of a two-dimensional metal and the acoustic phonons of an underlying piezoelectric substrate. Fundamental inequalities can be obtained from general energy arguments. As a result, phonon mediated attraction can be proven to never overcome electron Coulomb repulsion, at least for long phonon wavelengths. We study the influence of these phonons on the possible pairing instabilities of a two-dimensional electron gas such as graphene.Comment: 10 pages, 3 figure

Proposal of a dynamic performance index to analyze driving pattern effect on car emissions

The contributions of driver behaviour as well as surrounding infrastructure are decisive on pollutant emissions from vehicles in real traffic situations. This article deals with the preliminary study of the interaction between the dynamic variables recorded in a vehicle (driving pattern) and pollutant emissions produced over a given urban route. It has been established a “dynamic performance index”-DPI, which is calculated from some driving pattern parameters, which in turn depends on traffic congestion level and route characteristics, in order to determine whether the driving has been aggressive, normal or calm. Two passenger cars instrumented with a portable activity measurement system -to record dynamic variables- and on-board emission measurement equipment have been used. This study has shown that smooth driving patterns can reduce up to 80% NOX emissions and up to 20% of fuel in the same rout

Many-body effects in doped graphene on a piezoelectric substrate

We investigate the many-body properties of graphene on top of a piezoelectric substrate, focusing on the interaction between the graphene electrons and the piezoelectric acoustic phonons. We calculate the electron and phonon self-energies as well as the electron mobility limited by the substrate phonons. We emphasize the importance of the proper screening of the electron-phonon vertex and discuss the various limiting behaviors as a function of electron energy, temperature, and doping level. The effect on the graphene electrons of the piezoelectric acoustic phonons is compared with that of the intrinsic deformation acoustic phonons of graphene. Substrate phonons tend to dominate over intrinsic ones for low doping levels at high and low temperatures.Comment: 13 pages, 8 figure

Advertising of ultra-processed foods and beverages : children as a vulnerable population

Q4Q2Paciente infantilThe rapid nutrition transition occurring in Latin America has resulted in a sharp increase of childhood overweight and obesity. Recent evidence has shown that food and beverage advertising has a great influence on children’s eating behavior. This population has become a key target market for the ultra-processed foods and beverages industry, which is marketing products in an aggressive way. Evidence shows that Latin American countries have poor regulation of ultra-processed foods and beverages advertising, where the discourse of self-regulation still prevails over statutory regulations. The following commentary explores how advertising might play an important role in developing unhealthy dietary patterns and obesity in Latin American children, as well as the urgent need for government action and the involvement of civil society to tackle this public health issue.https://scienti.minciencias.gov.co/cvlac/visualizador/generarCurriculoCv.do?cod_rh=0001444978https://scienti.minciencias.gov.co/cvlac/visualizador/generarCurriculoCv.do?cod_rh=0000154547https://scienti.minciencias.gov.co/cvlac/visualizador/generarCurriculoCv.do?cod_rh=0001363227Revista Nacional - Indexad

Especificación formal en OCL de reglas de consistencia entre los diagramas de clases y casos de uso de UML y el modelo de interfaces

En el ciclo de vida del software, durante las fases de definición y análisis, se realiza una especificación de los requisitos. Para ello, es necesario realizar un proceso de captura de las necesidades y expectativas de los interesados, que se traduce posteriormente en un conjunto de modelos que representan tanto el problema como su solución. Por lo general, la mayoría de esos modelos se expresan en el lenguaje de modelado unificado –UML-, que define un conjunto de artefactos que permiten especificar los requisitos del software, los cuales deberían guardar consistencia, cuando se trate del mismo modelo. Sin embargo, la consistencia entre diferentes artefactos no se encuentra definida en la especificación de UML y poco se ha trabajado con este tipo de consistencia. En este artículo se propone un método para verificar la consistencia entre el diagrama de clases y el diagrama de casos de uso de UML de una manera formal. Dicho proceso se lleva a cabo evaluando una serie de reglas definidas en el lenguaje de restricciones de objetos –OCL- que se deben cumplir para garantizar que la información brindada por dichos modelos sea consistente. Como se reconoce la participación de los dos diagramas en la elaboración de las interfaces gráficas de usuario –GUI–, se define adicionalmente la consistencia con este artefacto

Desarrollo de un proceso a escala de laboratorio para la obtención de harina y un producto alimenticio a base de ocara de soya

La producción de leche de soya genera como subproducto la ocara, un material insoluble compuesto básicamente de proteína, fibra y carbohidratos. Este producto es utilizado en la industria de alimentos para animales por su valor proteínico.91 p.Contenido parcial: La soya -- Harina de ocara -- Productos de panificación -- Proceso de obtención de harina a partir de ocara de soya -- Obtención de harina de ocara de soya -- Selección del producto a desarrollar a partir de la harina de ocara de soya

Sectional category and The Fixed Point Property

For a Hausdorff space $X$, we exhibit an unexpected connection between the sectional number of the Fadell-Neuwirth fibration $\pi_{2,1}^X:F(X,2)\to X$, and the fixed point property (FPP) for self-maps on $X$. Explicitly, we demonstrate that a space $X$ has the FPP if and only if 2 is the minimal cardinality of open covers $\{U_i\}$ of $X$ such that each $U_i$ admits a continuous local section for $\pi_{2,1}^X$. This characterization connects a standard problem in fixed point theory to current research trends in topological robotics.Comment: 16 page

Aportes de una secuencia didáctica mediada por las tecnologías de la información y la comunicación-TIC- al desarrollo de la habilidad del pensamiento crítico evaluación de la información en los estudiantes de grado noveno de la Institución Educativa Leningrado Cuba

El presenta trabajo de investigación consiste en la aplicación de una secuencia de aprendizaje colaborativo para el desarrollo y la transformación del pensamiento crítico, fundamentalmente en la competencia evaluación de la información, mediada por TIC. Es una investigación de tipo cuantitativa que busca evidenciar a partir de procesos estadísticos que el problema del No desarrollo de esta competencia fundamental en el paradigma actual radica en las didácticas a emplear, utilizando en la secuencia un pre-test y un post-test para la recolección de los datos, la secuencia didáctica fue basada en los modelos de Zabala, con un corpus teórico desde autores como López Aymes Gabriela y el proyecto Delphi con respecto al pensamiento crítico, y los postulados de Cesar Coll acerca de entender las TIC como una nueva cultura del aprendizaje