The Kinematics of HH 34 from HST Images with a Nine-year Time Baseline

We study archival HST [S II] 6716+30 and Hα images of the HH 34 outflow, taken in 1998.71 and in 2007.83. The ~9 yr time baseline and the high angular resolution of these observations allow us to carry out a detailed proper-motion study. We determine the proper motions of the substructure of the HH 34S bow shock (from the [S II] and Hα frames) and of the aligned knots within ~30'' from the outflow source (only from the [S II] frames). We find that the present-day motions of the knots along the HH 34 jet are approximately ballistic, and that these motions directly imply the formation of a major mass concentration in ~900 yr, at a position similar to the one of the present-day HH 34S bow shock. In other words, we find that the knots along the HH 34 jet will merge to form a more massive structure, possibly resembling HH 34S

Coeficientes de rozamiento estático y dinámico en la madera de pino silvestre (Pinus sylvestris L.), según las direcciones paralela y perpendicular a la fibra

In this study the static (µe) and kinetic (µd) coefficients of friction were obtained for Pinus sylvestis L. sawn timber of Spanish origin. Friction between transverse surfaces sliding perpendicular to the grain (tangential direction) and radial surfaces sliding parallel to the grain was analyzed. A specifically designed device was used for tests, which makes it possible to apply contact pressure and measure displacements and applied loads simultaneously. Coefficients of friction between transverse surfaces (µe = 0,24; µd = 0,17) were about twice of the coefficients of friction between radial surfaces (µe = 0,12; µd = 0,08). Furthermore, these values are located within normal values of those commonly reported for softwood. The results are considered preliminary due to the small number of specimens.En este estudio se determinaron los coeficientes de rozamiento, estático (µe) y dinámico (µd), en madera aserrada de Pinus sylvestris L. de procedencia española, diferenciando si se produce el contacto entre secciones de corte transversal con deslizamiento en dirección perpendicular a la fibra (en dirección tangencial), o entre secciones de corte radial con deslizamiento paralelo a la fibra. Para la realización de los ensayos se ha utilizado un dispositivo, diseñado específicamente, que posibilita la aplicación de una presión de contacto y la medición del desplazamiento y de la fuerza aplicada de manera simultánea, permitiendo la obtención de los coeficientes de rozamiento estático y dinámico. Los coeficientes de rozamiento obtenidos entre secciones transversales (µe = 0.24; µd = 0.17) fueron del orden del doble de los coeficientes de rozamiento entre secciones radiales (µe = 0.12; µd = 0.08). Además, estos valores se encuentran dentro de los valores que aparecen habitualmente en la bibliografía para madera de coníferas. Debido al escaso tamaño de la muestra los resultados se consideran preliminares

Enhancing Big Data Feature Selection Using a Hybrid Correlation-Based Feature Selection

This study proposes an alternate data extraction method that combines three well-known feature selection methods for handling large and problematic datasets: the correlation-based feature selection (CFS), best first search (BFS), and dominance-based rough set approach (DRSA) methods. This study aims to enhance the classifier’s performance in decision analysis by eliminating uncorrelated and inconsistent data values. The proposed method, named CFS-DRSA, comprises several phases executed in sequence, with the main phases incorporating two crucial feature extraction tasks. Data reduction is first, which implements a CFS method with a BFS algorithm. Secondly, a data selection process applies a DRSA to generate the optimized dataset. Therefore, this study aims to solve the computational time complexity and increase the classification accuracy. Several datasets with various characteristics and volumes were used in the experimental process to evaluate the proposed method’s credibility. The method’s performance was validated using standard evaluation measures and benchmarked with other established methods such as deep learning (DL). Overall, the proposed work proved that it could assist the classifier in returning a significant result, with an accuracy rate of 82.1% for the neural network (NN) classifier, compared to the support vector machine (SVM), which returned 66.5% and 49.96% for DL. The one-way analysis of variance (ANOVA) statistical result indicates that the proposed method is an alternative extraction tool for those with difficulties acquiring expensive big data analysis tools and those who are new to the data analysis field.Ministry of Higher Education under the Fundamental Research Grant Scheme (FRGS/1/2018/ICT04/UTM/01/1)Universiti Teknologi Malaysia (UTM) under Research University Grant Vot-20H04, Malaysia Research University Network (MRUN) Vot 4L876SPEV project, University of Hradec Kralove, Faculty of Informatics and Management, Czech Republic (ID: 2102–2021), “Smart Solutions in Ubiquitous Computing Environments

Effect of optimization framework on rigid and non-rigid multimodal image registration

The process of transforming or aligning two images is known as image registration. In the present era, image registration is one of the most popular transformation tools in case of, for example, satellite as well as medical imaging analysis. Images captured by difference devices that can be processed under same registration model are called multimodal images. In this work, we present a multimodal image registration framework, upon which ant colony optimization (ACO) and flower pollination algorithms (FPA), which are two meta heuristics algorithms, are applied in order to improve the performance of a proposed rigid and non-rigid multimodal registration framework and decrease its processing time. The results of the ACO and FPA based framework were compared against particle swarm optimization and Genetic algorithm-based framework's results and seem to be promising

Investigating the effects of lightning on cultural heritage: Characterization of the resulting fulgurite

On average, about 100 lightning discharges occur every second on the Earth. When lightning strikes soil, sand or rock, the high temperatures reached (about 30.000 ºK) promote the formation of melted glass tubular structures known as fulgurites. In the case referred here, lightning stroked a soil (granitic sand plus angular stones of thick-grained two-mica granite) and allochthonous materials supporting the platform of an electric tower. The intense melting produced a cylindrical rod, from which, as if they were roots of a tree, several bifurcating horizontal and subhorizontal branches of decreasing thickness were attached (see figure below).Peer reviewe

Using clustering methods to deal with high number of alternatives on Group Decision Making

Novel Group Decision Making methods and Web 2.0 have augmented the quantity of data that experts have to discuss about. Nevertheless, experts are only capable of dealing with a reduced set of information. In this paper, a novel method for dealing with decision environments that include a large set of alternatives is presented. By the use of clustering methods, the available alternatives are combined into clusters according to their similarity. Afterwards, one Group Decision Making process is employed for choosing a cluster and another one for selecting the final alternative.The authors would like to thank the FEDER financial support for the Project TIN2016-75850-P by the Spanish Ministry of Science, Innovation and Universities

uDDS: A Middleware for Real-time Wireless Embedded Systems

[EN] A Real-Time Wireless Distributed Embedded System (RTWDES) is formed by a large quantity of small devices with certain computing power, wireless communication and sensing/actuators capabilities. These types of networks have become popular as they have been developed for applications which can carry out a vast quantity of tasks, including home and building monitoring, object tracking, precision agriculture, military applications, disaster recovery, industry applications, among others. For this type of applications a middleware is used in software systems to bridge the gap between the application and the underlying operating system and networks. As a result, a middleware system can facilitate the development of applications and is designed to provide common services to the applications. The development of a middleware for sensor networks presents several challenges due to the limited computational resources and energy of the different nodes. This work is related with the design, implementation and test of a micro middleware for RTWDES; the proposal incorporates characteristics of a message oriented middleware thus allowing the applications to communicate by employing the publish/subscribe model. Experimental evaluation shows that the proposed middleware provides a stable and timely service to support different Quality of Service (QoS) levels. © 2011 Springer Science+Business Media B.V.This work was developed as a part of the D2ARS Project supported by CYTED. UNESCO code 120325;330417;120314;120305.González, A.; Mata, W.; Villaseñor, L.; Aquino, R.; Simó Ten, JE.; Chávez, M.; Crespo Lorente, A. (2011). uDDS: A Middleware for Real-time Wireless Embedded Systems. Journal of Intelligent and Robotic Systems. 64(3-4):489-503. https://doi.org/10.1007/s10846-011-9550-zS489503643-4Akyildiz, I.F., Su, W., Sankarasubramaniam, Y., Cayirci, E.: A survey on sensor networks. IEEE Commun. Mag. 40, 102–114 (2002)Aquino, R., González, A., Rangel, V., García, M. Villaseñor, L.A., Edwards-Block, A.: Wireless communication protocol based on EDF for wireless body sensor networks, k. Journal of Applied Sciences and Technology 6(2), 104–114 (2008)Bonnet, P., Gehrke, J.E., Seshadri, P.: Querying the physical world. IEEE Pers. Commun. 7(5), 10–15 (2000)Boonma, P., Suzuki, J.: TinyDDS: an interoperable and configurable publish/subscribe middleware for wireless sensor networks. In: Hinze, A., Buchmann, A. (eds.) Handbook of Research on Advanced Distributed Event-based Systems. Publish/Subscribe and Message Filtering Technologies, IGI Global (2009)Cerpa, A., Elson, J., Hamilton, M., Zhao, J.: Habitat monitoring: application driver for wireless communications technology. ACM SIGCOMM Workshop on Data Communications in Latin America and the Caribbean, Costa Rica (2002)Corsaro, A., Schmidt, D.C.: The design and performace of real-time java middleware. IEEE Trans. Parallel Distrib. Syst. 14(11), issn 1045–9219, 1155–1167 (2003)Culler, D.E., Hong, W.: Wireless sensor networks introduction. Commun. ACM 47(6), 30–33 (2004)Estrin, D., Govindan, R., Heidemann, J.S., Kumar, S.: Next century challenges: scalable coordination in sensor networks. In: Mobile Computing and Networking, pp. 263–270 (1999)Heinzelman, W.B., Murphy, A.L., Carvalho, H.S.: Middleware to support sensor network applications. IEEE Netw. 18, 6–14 (2004)Hill, J., Szewczyk, R., Woo, A., Hollar, S., Culler, D., Pister, K.: System architecture directions for networked sensors. ACM SIGOPS Oper. Syst. Rev. 34(5), 93–104 (2000)Levis, P., Culler, D.: Mate: a tiny virtual machine for sensor networks. In: Proceedings of the 10th International Conference on Achitectural Support for Programming Languages and Operating Systems. San Jose, CA (2002)Liu, T., Martonosi, M.: Impala: a middleware system for managing autonomic, parallel sensor systems. In: Proceedings of the Ninth ACM SIGPLAN Symposium on Principles and Practice of Parallel Programming. San Diego, CA (2003)Mata, W., González, A., Aquino, R., Crespo, A., Ripoll, I., Capel, M.: A wireless networked embedded sistem with a new real-time Kernel PaRTiKle. Electronics, Robotics and Automotive Mechanics Conference, CERMA 2007. ISBN 0-7695-2974-7. Cuernavaca, México (2007)Mata, W., González, A., Crespo, A.: A proposal for real-time middleware for wireless sensor networks. Workshop on Sensor Networks and Applications (WseNA’08). Gramado, Brasil (2008)Mata, W., González, A., Fuentes, G., Fuentes, R., Crespo, A., Carr, D.: Porting jRate(RT-Java) to a POSIX real-time Linux Kernel. Tenth Real-Time Linux Workshop. Colotlán, Jalisco México (2008)MiLAN Project: Available: http://www.futurehealth.rochester.edu/milan (2008)OMG, Data Distribution Service for Real-Time Systems Version 1.2. OMG Technical Document (2007)OMG, Model Driven Architecture (MDA), Document Number ormsc/2001-07-01. Technical report, OMG (2001)OMG, Overview and guide to OMGs architecture, OMG Technical Document formal/03-06-01 (2003)Pardo-Castellote, G., Farabaugh, B., Warren, R.: An Introduction to DDS and Data-centric Communications. Available: http://www.omg.org/news/whitepapers/Intro_To_DDS.pdf (2005)Peiro, S., Masmano, M., Ripoll, I., Crespo, A.: PaRTiKle OS, a replacement of the core of RTLinux. In: 9th Real-Time Linux Workshop (2007)Peiro, S., Masmano, M., Ripoll, I., Crespo, A.: PaRTiKle LPC, port to the LPC2000. Tehth Real-Time Linux Workshop. Colotlán, Jalisco M’exico (2008)Pottie, G.J., Kaiser, W.J.: Wireless integrated networks sensors. Commun. ACM 43(5), 52–58 (2000)Souto, E., Guimaraes, G., Vasconcelos, G., Vieira, M., Rosa, N., Ferraz, C., Kelner, J.: Mires: a publish/subscribe middleware for sensor networks. Pers Ubiquit Comput 10(1), 37–44 (2006)St Ville, L., Dickman, P.: Garnet: a middleware architecture for distributing data streams originating in wireless sensor networks. In: Proceedings. 23rd International Conference on Distributed Computing Systems Workshops (2003

La metodología de aprendizaje basado en proyectos (ABP) aplicada a asignaturas de ciencia de los materiales en ingeniería en la red IdM@ti

En este trabajo se va a presentar una experiencia docente llevada a cabo de forma coordinada entre profesorado de la red de innovación docente en ciencia de materiales IdM@ti. Se trata por tanto de una experiencia interuniversitaria que se ha desarrollado entre cuatro universidades públicas españolas de manera simultánea. Concretamente, el presente trabajo muestra la implementación y el desarrollo de la aplicación de la metodología de aprendizaje basado en proyectos en asignaturas de grados de ingeniería en el ámbito de ciencia de los materiales e ingeniería metalúrgica. Se presentan las experiencias llevadas a cabo durante los últimos cuatro años, mostrando los puntos fuertes y débiles de esta metodología, así como la problemática asociada a la implementación de la misma en asignaturas de curso general de grado. Se presentarán también los resultados obtenidos, así como las principales conclusiones a las que ha llegado el equipo de trabajo de la red IdM@ti

Factors modulating herbivory patterns in Cymodocea nodosa meadows

In coastal marine food webs, seagrass-grazer interactions play a fundamental role in ecological processes by regulating the structure and functioning of plant communities. Therefore, assessing the strength of these seagrass-grazer links and identifying the mechanisms that regulate these relationships are crucial to increasing our understanding of community and ecosystem structure and dynamics. Herbivory on the temperate seagrass Cymodocea nodosa was evaluated in four locations with contrasting abiotic and biotic factors (i.e., depth; meadow size; seagrass shoot density, productivity, and leaf traits; and herbivore presence) using cross-transplantation experiments carried out once per season to account for seasonal variation. Patterns of feeding rates on C. nodosa meadows showed high temporal variability, with peaks occurring in spring and summer. Results indicate that between 46.59% and 74.08% of the annual leaf production is lost to herbivory at the locations sampled in this study. Herbivory rates increased with higher nitrogen content and shoot density for all types of consumers (mesograzers, fishes, and sea urchins). This work highlights the need to integrate the abiotic and biotic factors modulating herbivory patterns, particularly in a foundation species like C. nodosa, for which changes in plant traits and grazer abundance may trigger trophic cascades with far-reaching consequences for associated species.This study was funded by the Spanish national project CTM2011-24482 (SEA-LIVE), by the Junta de Andalucia Excelence Project PRODESCA (P12-RNM-3020)) and by Ser-Cady project (FEDER-UCA18-107451) cofinanced by the 2014–2020 ERDF Operational Programme and by the Department of Economy, Knowledge, Business and University of the Regional Government of Andalusia. We thank Carmen Henares for field assistance

Use of refractory chromites for obtaining fluxes amassed employed in submerged arc welding (SAW)

11 páginas, 2 figuras, 8 tablal.[ES] En el presente trabajo se obtienen ferrocromo de alto carbono (ferrocromo de carga) y escorias a partir del proceso de reducción de cromitas refractarias. Mediante la utilización de un diseño de experimento de relaciones entre componentes, se estudia la obtención de aleaciones y escorias. La composición química de ambas garantiza su aplicación para la conformación de cargas aleantes y matrices de fundentes aglomerados, para el relleno superficial mediante soldadura automática por arco sumergido (SAW). El proceso de fusión-reducción se realiza en un horno eléctrico de arco.[EN] In the present work high carbon ferrochrome (load ferrochrome) and slags are obtained, starting frora the métallurgie reductive processing of refractory chromites. The obtaining of alloys and slags is studied using an experiment design based in the relationships among components. The chemical compositions of alloys and slags guarantee their application for the conformation of alloys loads and matrix fluxes amassed for the superficial filling by means of submerged arc welding (SAW). The melting-reduction process is carried out in an electric arc furnace.Peer reviewe