Near-Field Directionality Beyond the Dipole Approximation: Electric Quadrupole and Higher-Order Multipole Angular Spectra

Within the context of spin-related optical phenomena, the near-field directionality is generally understood from the quantum spin Hall effect of light, according to which the transverse spin of surface or guided modes is locked to the propagation direction. So far, most previous works have been focused on the spin properties of circularly polarized dipolar sources. However, in near-field optics, higher-order multipole sources (e.g., quadrupole, octupole, and so on) might become relevant, so a more in-depth formulation would be highly valuable. Building on the angular spectrum representation, we provide a general, analytical, and ready-to-use treatment in order to address the near-field directionality of any multipole field, particularizing to the electric quadrupole case. Besides underpinning and upgrading the current framework on spin-dependent directionality, our results may open up new perspectives for engineering light-matter coupling at the nanoscale.Comment: 7 pages, 2 figures. Supplemental Material (19 pages). Supplemental tools (calculator of angular spectra and animation) available at https://doi.org/10.5281/zenodo.267790

El proceso de inserción laboral: Implicaciones educativas para la mejora de la empleabilidad

This research revises all the explanatory efforts produced around the labour insertion process. First, we have gone through the different theories that analyse job paths and achievements. Later we have emphasized, considering the integral models, the importance of “personal” and educative factors in labour insertion. Finally, we can conclude that this process is influenced by different variables such as educational, psychological, social, contextual, etc. However, we consider the main role of personal values and aspects; consequently, the design, development and planning of those educational actions addressed to improve labour insertion, must consider this group of qualities found in people’s personality.En este trabajo se revisan todos los esfuerzos explicativos que se han producido en torno al proceso de inserción laboral. Realizamos un recorrido por las diferentes teorías que analizan las trayectorias y logros laborales. Posteriormente, destacamos, sobre la base de los modelos integrales, la importancia de los “factores personales” y educativos en la inserción laboral. Por último, llegamos a la conclusión de que este proceso está condicionado por múltiples variables de tipo formativo, psicológico, social, contextual, etc. Sin embargo, reflexionamos sobre el papel central que juegan los aspectos y valores personales; por lo que el diseño, desarrollo y planificación de acciones educativas orientadas a mejorar la inserción laboral deben tener en cuenta este conjunto de cualidades radicadas en lo personal

Replacing pooling functions in Convolutional Neural Networks by linear combinations of increasing functions

Traditionally, Convolutional Neural Networks make use of the maximum or arithmetic mean in order to reduce the features extracted by convolutional layers in a downsampling process known as pooling. However, there is no strong argument to settle upon one of the two functions and, in practice, this selection turns to be problem dependent. Further, both of these options ignore possible dependencies among the data. We believe that a combination of both of these functions, as well as of additional ones which may retain different information, can benefit the feature extraction process. In this work, we replace traditional pooling by several alternative functions. In particular, we consider linear combinations of order statistics and generalizations of the Sugeno integral, extending the latter’s domain to the whole real line and setting the theoretical base for their application. We present an alternative pooling layer based on this strategy which we name ‘‘CombPool’’ layer. We replace the pooling layers of three different architectures of increasing complexity by CombPool layers, and empirically prove over multiple datasets that linear combinations outperform traditional pooling functions in most cases. Further, combinations with either the Sugeno integral or one of its generalizations usually yield the best results, proving a strong candidate to apply in most architectures.Tracasa Instrumental (iTRACASA), SpainGobierno de Navarra-Departamento de Universidad, Innovacion y Transformacion Digital, SpainSpanish Ministry of Science, Spain PID2019-108392GB-I00Andalusian Excellence project, Spain PID2019-108392GB-I00Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPQ) PC095-096Fundacao de Amparo a Ciencia e Tecnologia do Estado do Rio Grande do Sul (FAPERGS) P18-FR-4961 301618/2019-4 19/2551-000 1279-

Longitudinal control for a laboratoty helicopter via constructive approximate backstepping

16th IFAC World Congress, Praga 2005This article presents a controller design based on Lyapunov functions, which can be applied to a class of underactuated systems that cannot be feedback linearized in a specific set point. Particularly, this design will be applied in order to control the longitudinal dynamics of a laboratory helicopter. The longitudinal system is an electro-mechanical, non-linear and underactuated system. The proposed methodology consists of modifying the model of the system using an overparametrization in such a way that the backstepping theory can be applied to the approximate system. The methodology has been tested by simulated and experimental results and it has been proved for the closed-loop system that the origin is LES

Multi-homing tunnel broker

A proper support for communications has to provide fault tolerance capabilities such as the preservation of established connections in case of failures. Multihoming addresses this issue, but the currently available solution based in massive BGP route injection presents serious scalability limitations, since it contributes to the exponential growth of the BGP table size. An alternative solution based on the configuration of tunnels between the multihomed site exit routers and the ISP border routers has been proposed for IPv6 in RFC 3178. However, the amount of manual configuration imposed by this solution on the ISP side prevents its wide adoption. In particular, this solution requires at the ISP the manual configuration of a tunnel endpoint per each multihomed client that it serves. We present a multihoming tunnel broker (MHTB) that provides automatic creation of the tunnel endpoint at the ISP side.This work was supported by the SAM (Advanced Servers with Mobility)project, funded by the Spanish National research and Development Programme as TIC2002-04531-C04-03.Publicad

"Judio vesino en el Alcaçar del Castillo de la Dicha çibdad de Lorca": Judería, poder económico y entorno social en una ciudad de la frontera de Granada

The presence of the Jewish community in the border town of Lorca has been little known to historians who study this minority group in the Late Middle Ages. Recent archaeological studies have brought to light the community, which had settled in Lorca during the Repopulation by Alfonso X in the 13th century. This paper studies the life of the Jewish community in the historical and geographical context of the Border with the Kingdom of Granada

Information science research via graduate education in Cuba up to the year 2010

Los estudios de posgraduación en cualquier campo del conocimiento suponen un elevado nivel de especialización en los resultados de investigación. Conocer la evolución de la producción investigadora a través de parámetros empleados en la evaluación de la ciencia, como los indicadores bibliométricos, adquiere, por tanto, relevancia cuando los datos que se analizan provienen de estudios de este tipo. En este artículo se analiza el caso de la investigación posgraduada en el campo de la información en Cuba y se ofrecen resultados a través del análisis de indicadores, como la cantidad de tesis defendidas por año y grado, los tutores más productivos, la colaboración en la tutoría, el comportamiento de estas investigaciones por línea de investigación, así como los tópicos más estudiados y los tipos de investigación predominantes en el campo. También se analiza la filiación institucional y geográfica de los graduados. Del total de 156 tesis, 35 son de doctorado y 121 de maestría. Los tutores más representados son figuras prestigiosas de la especialidad; la línea de investigación más tratada es la relacionada con la gestión documental, de información y del conocimiento y la mayor parte de las investigaciones (71 %) son de carácter empírico. La mayor parte de los egresados de programas de posgrado en la especialidad pertenecen al Ministerio de Educación Superior y se concentran mayoritariamente en la capital del país.Graduate studies in any area of knowledge presuppose a high level of specialization in research results. Understanding the evolution of research production usingscience evaluation parameters such as bibliometric indicators, is even more relevant when the data under analysis come from this type of study. The paper examines the status of graduate research in the field of information science in Cuba. The results provided are based on the analysis of indicators such as the number of theses submitted per year and degree, the most productive supervisors, the number of joint supervisions, the behavior of research tasks per research line, the topics most frequently dealt with, and the predominant research types in the field. An analysis is also conducted of the institutional affiliation and geographic location of graduates. Of the total 156 theses, 35 are doctoral and 121 correspond to the master's degree. The most represented supervisors are prestigious professionals from the specialty. The most common research line was document, information and knowledge management, and most studies (71%) were empirical. Most participants in graduate programs from the specialty belong to the Ministry of Higher Education and most of them live in the country's capital

Nanostructures with Group IV nanocrystals obtained by LPCVD and thermal annealing of SiGeO layers

Nanocrystals embedded in an oxide matrix have been fabricated by annealing SiGeO films deposited by LPCVD. The composition of the oxide layers and its evolution after annealing as well as the presence and nature of nanocrystals in the films have been studied by several experimental techniques. The results are analyzed and discussed in terms of the main deposition parameters and the annealing temperature

Consumo y decisiones de portafolio en ambientes estocásticos: un marco teórico unificador.

This paper is aimed to provide a consistent theoretical framework for the decision making process of a consumer-investor in an environment of risk and uncertainty with constant volatility. In this research, the Wiener and Poisson processes play an essential role in modeling market risk and uncertainty in economic policy. In this context different models of partial equilibrium that characterize consumption and proportions of wealth that a rational consumer allocates to the distinct assets available in the financial markets (domestic and foreign) are systematically examined.Market risk, fiscal policy, stochastic modeling and consumer's inter-temporal decisions

The commoditization of the publication culture in Spain: a cost- and time-effective model to systematize Communication Sciences

This paper explores the current paradigm of the publication culture in Spain, examining the negative and positive forces that shape the dominant dynamics in the production, dissemination and evaluation of scholars' works. Following the intentional sampling of maximum variety, we planned a set of interviews with scholars in the area of communication that represented the heterogeneity of academic ranks, gender, and territories of Spain. The final output consisted of thirty-five semi-structured interviews that took place between May 2018 and May 2019. Scholarship on how researchers and university professors experience publication cultures is abundant, however the national and international studies that address this phenomenon from a holistic approach are practically non-existent. Comprising three actions or systems -production, dissemination and evaluation-, the current publishing culture is depicted as a structure tuned to a set of global-accepted requirements that seem easy to understand and replicate. Under such model, most of the scholars ex-perience discomfort because overproduction is widespread, social transference is rare, and the production and diffusion of scientific works frequently occur at the expense of scholars themselves. The goal seems to be inspired by the cost- and time-effective system of evaluation processes that, despite academics' general opposition, official bodies and university departments have adopted to circumvent the costly task of assessing scientists' outcomes on an individual basis