Fixed points of nonexpansive mappings in spaces of continuous functions

Let K be a compact metrizable space and C(K) the Banach space of all real continuous functions defined on K with the maximum norm. It is known that C(K) fails to have the weak fixed point property for nonexpansive mappings (w-FPP) when K contains a perfect set. However the space C(ω n + 1), where n ∈ N and ω is the first infinite ordinal number, enjoys the w-FPP and so C(K) also satisfies this property if K(ω) = ∅. It is unknown if C(K) has the w-FPP when K is a scattered set such that K(ω) 6= ∅. In this paper we prove that certain subspaces of C(K), with K(ω) 6= ∅, satisfy the w-FPP. To prove this result we introduce the notion of ω-almost weak orthogonality and we prove that an ω-almost weakly orthogonal closed subspace of C(K) enjoys the w-FPP. We show an example of an ω-almost weakly orthogonal subspace of C(ω ω + 1) which is not contained in C(ω n + 1) for any n ∈ N.Dirección General de Enseñanza SuperiorJunta de Andalucí

Non-expansive mappings in spaces of continuous functions

Let K be a compact metrizable space and C(K) the Banach space of all real continuous functions defined on K with the maximum norm. It is known that C(K) fails to have the weak fixed point property for nonexpansive mappings (w-FPP) when K contains a perfect set. However the space C(ω n + 1), where n ∈ N and ω is the first infinite ordinal number, enjoys the w-FPP and so C(K) also satisfies this property if K(ω) = ∅. It is unknown if C(K) has the w-FPP when K is a scattered set such that K(ω) 6= ∅. In this paper we prove that certain subspaces of C(K), with K(ω) 6= ∅, satisfy the w-FPP. To prove this result we introduce the notion of ω-almost weak orthogonality and we prove that an ω-almost weakly orthogonal closed subspace of C(K) enjoys the w-FPP. We show an example of an ω-almost weakly orthogonal subspace of C(ω ω + 1) which is not contained in C(ω n + 1) for any n ∈ N.Dirección General de Enseñanza SuperiorJunta de Andalucí

Validación de la versión mexicana del CSAI-2R en sus escalas de intensidad y dirección

Dentro de la teoría multidimensional de la ansiedad se ha desarrollado el Inventario de Ansiedad Estado Competitiva-2Revisado (csai-2r) para evaluar la ansiedad somática, ansiedad cognitiva y autoconfi anza en el deporte. El propósito del presente estudio fue evaluar el modelo de medida trifactorial del csai-2r en sus escalas de intensidad y de dirección adaptadas al contexto mexicano, examinando su fi abilidad e invarianza factorial a través del género. Respondieron dichos instrumentos 454 deportistas universitarios (m = 21.15 años de edad; de = 2.02). Los resultados ofrecieron apoyo al modelo de tres factores para la escala de intensidad, y confi rmaron su invarianza total en función del género. Para la escala de dirección resultó más adecuado un modelo de dos factores, y se confi rmó su invarianza parcial en función del género. En conclusión, el csai-2r con ambas escalas de intensidad y dirección adaptadas al contexto mexicano puede ser utilizado para evaluar la ansiedad precompetitiva

Stochastic Cooperative Decision Approach for Studying the Symmetric Behavior of People in Wireless Indoor Location Systems

[EN] Nowadays, several wireless location systems have been developed in the research world. The goal of these systems has always been to find the greatest accuracy as possible. However, if every node takes data from the environment, we can gather a lot of information, which may help us understand what is happening around our network in a cooperative way. In order to develop this cooperative location and tracking system, we have implemented a sensor network to capture data from user devices. From this captured data we have observed a symmetry behavior in people's movements at a specific site. By using these data and the symmetry feature, we have developed a statistical cooperative approach to predict the new user's location. The system has been tested in a real environment, evaluating the next location predicted by the system and comparing it with the next location in the real track, thus getting satisfactory results. Better results have been obtained when the stochastic cooperative approach uses the transition matrix with symmetry.This work is supported by the "Universitat Politecnica de Valencia" through "PAID-05-12".Tomás Gironés, J.; García Pineda, M.; Canovas Solbes, A.; Lloret, J. (2016). Stochastic Cooperative Decision Approach for Studying the Symmetric Behavior of People in Wireless Indoor Location Systems. Symmetry (Basel). 8(7):1-13. https://doi.org/10.3390/sym8070061S11387Gu, Y., Lo, A., & Niemegeers, I. (2009). A survey of indoor positioning systems for wireless personal networks. IEEE Communications Surveys & Tutorials, 11(1), 13-32. doi:10.1109/surv.2009.090103Maghdid, H. S., Lami, I. A., Ghafoor, K. Z., & Lloret, J. (2016). Seamless Outdoors-Indoors Localization Solutions on Smartphones. ACM Computing Surveys, 48(4), 1-34. doi:10.1145/2871166Li, F., Zhao, C., Ding, G., Gong, J., Liu, C., & Zhao, F. (2012). A reliable and accurate indoor localization method using phone inertial sensors. Proceedings of the 2012 ACM Conference on Ubiquitous Computing - UbiComp ’12. doi:10.1145/2370216.2370280Zheng, Y., Shen, G., Li, L., Zhao, C., Li, M., & Zhao, F. (2014). Travi-Navi. Proceedings of the 20th annual international conference on Mobile computing and networking - MobiCom ’14. doi:10.1145/2639108.2639124Sendra, S., Lloret, J., Turró, C., & Aguiar, J. M. (2014). IEEE 802.11a/b/g/n short-scale indoor wireless sensor placement. International Journal of Ad Hoc and Ubiquitous Computing, 15(1/2/3), 68. doi:10.1504/ijahuc.2014.059901Farid, Z., Nordin, R., & Ismail, M. (2013). Recent Advances in Wireless Indoor Localization Techniques and System. Journal of Computer Networks and Communications, 2013, 1-12. doi:10.1155/2013/185138Jain, A. K., Duin, P. W., & Jianchang Mao. (2000). Statistical pattern recognition: a review. IEEE Transactions on Pattern Analysis and Machine Intelligence, 22(1), 4-37. doi:10.1109/34.824819Fitzek, F. H. P., & Katz, M. D. (Eds.). (2006). Cooperation in Wireless Networks: Principles and Applications. doi:10.1007/1-4020-4711-8Nosratinia, A., Hunter, T. E., & Hedayat, A. (2004). Cooperative communication in wireless networks. IEEE Communications Magazine, 42(10), 74-80. doi:10.1109/mcom.2004.1341264Ammari, H. M. (2010). Coverage in Wireless Sensor Networks: A Survey. Network Protocols and Algorithms, 2(2). doi:10.5296/npa.v2i2.276Hsiao-Wecksler, E. T., Polk, J. D., Rosengren, K. S., Sosnoff, J. J., & Hong, S. (2010). A Review of New Analytic Techniques for Quantifying Symmetry in Locomotion. Symmetry, 2(2), 1135-1155. doi:10.3390/sym2021135Nunes, B. A. A., & Obraczka, K. (2011). On the symmetry of user mobility in wireless networks. 2011 IEEE International Symposium on a World of Wireless, Mobile and Multimedia Networks. doi:10.1109/wowmom.2011.5986146Deng, Z., Yu, Y., Yuan, X., Wan, N., & Yang, L. (2013). Situation and development tendency of indoor positioning. China Communications, 10(3), 42-55. doi:10.1109/cc.2013.6488829Lloret, J., Tomas, J., Garcia, M., & Canovas, A. (2009). A Hybrid Stochastic Approach for Self-Location of Wireless Sensors in Indoor Environments. Sensors, 9(5), 3695-3712. doi:10.3390/s90503695Feng, C., Au, W. S. A., Valaee, S., & Tan, Z. (2012). Received-Signal-Strength-Based Indoor Positioning Using Compressive Sensing. IEEE Transactions on Mobile Computing, 11(12), 1983-1993. doi:10.1109/tmc.2011.216Wang, J., Hu, A., Liu, C., & Li, X. (2015). A Floor-Map-Aided WiFi/Pseudo-Odometry Integration Algorithm for an Indoor Positioning System. Sensors, 15(4), 7096-7124. doi:10.3390/s150407096Dhruv Pandya, Ravi Jain, & Lupu, E. (s. f.). Indoor location estimation using multiple wireless technologies. 14th IEEE Proceedings on Personal, Indoor and Mobile Radio Communications, 2003. PIMRC 2003. doi:10.1109/pimrc.2003.1259108Garcia, M., Sendra, S., Lloret, J., & Canovas, A. (2011). Saving energy and improving communications using cooperative group-based Wireless Sensor Networks. Telecommunication Systems, 52(4), 2489-2502. doi:10.1007/s11235-011-9568-3Garcia, M., & Lloret, J. (2009). A Cooperative Group-Based Sensor Network for Environmental Monitoring. Cooperative Design, Visualization, and Engineering, 276-279. doi:10.1007/978-3-642-04265-2_41Patwari, N., Ash, J. N., Kyperountas, S., Hero, A. O., Moses, R. L., & Correal, N. S. (2005). Locating the nodes: cooperative localization in wireless sensor networks. IEEE Signal Processing Magazine, 22(4), 54-69. doi:10.1109/msp.2005.1458287Conti, A., Guerra, M., Dardari, D., Decarli, N., & Win, M. Z. (2012). Network Experimentation for Cooperative Localization. IEEE Journal on Selected Areas in Communications, 30(2), 467-475. doi:10.1109/jsac.2012.120227Xuyu Wang, Hui Zhou, Shiwen Mao, Pandey, S., Agrawal, P., & Bevly, D. M. (2015). Mobility improves LMI-based cooperative indoor localization. 2015 IEEE Wireless Communications and Networking Conference (WCNC). doi:10.1109/wcnc.2015.7127811Cooperative Decision Making in a Stochastic Environment (No. urn: nbn: nl: ui: 12-76799)http://EconPapers.repec.org/RePEc:tiu:tiutis:a84d779a-d5a9-48e9-bfe7-46dea6f1de69Krishnan, P., Krishnakumar, A. S., Ju, W.-H., Mallows, C., & Gamt, S. (2004). A system for LEASE: Location estimation assisted by stationary emitters for indoor RF wireless networks. IEEE INFOCOM 2004. doi:10.1109/infcom.2004.1356987WANG, H., & Jia, F. (2007). A Hybrid Modeling for WLAN Positioning System. 2007 International Conference on Wireless Communications, Networking and Mobile Computing. doi:10.1109/wicom.2007.537Roos, T., Myllymäki, P., Tirri, H., Misikangas, P., & Sievänen, J. (2002). International Journal of Wireless Information Networks, 9(3), 155-164. doi:10.1023/a:1016003126882Xie, H., Tanin, E., & Kulik, L. (2007). Distributed Histograms for Processing Aggregate Data from Moving Objects. 2007 International Conference on Mobile Data Management. doi:10.1109/mdm.2007.30Krishnamachari, B., & Iyengar, S. (2004). Distributed Bayesian algorithms for fault-tolerant event region detection in wireless sensor networks. IEEE Transactions on Computers, 53(3), 241-250. doi:10.1109/tc.2004.1261832Nguyen, X., Jordan, M. I., & Sinopoli, B. (2005). A kernel-based learning approach to ad hoc sensor network localization. ACM Transactions on Sensor Networks, 1(1), 134-152. doi:10.1145/1077391.107739

Situational and Dispositional Factors that Predict Motivation: a Multilevel Study

Abstract. This study aimed to test a multilevel mediation model which examined the relationship between the perceived motivational climate created by coaches at team level and motivational regulations towards sport at individual level, as mediated by individual goal orientations. 211 university athletes from 20 teams training in different types of sport completed a battery of instruments that measured the variables included in the model. The statistics significance level was .05. Results of the multilevel mediation model revealed that the task-involving climate at team level positively predicted individual task orientation (γ01 = .77, p .05). The results are in line with previous research that have focused in the study of motivational climate at individual level, but the present study make a novel contribution by providing the perspective of a multilevel mediation model and thereby clarifying the phenomenon at team level

Weak compactness and fixed point property for affine mappings

It is shown that a closed convex bounded subset of a Banach space is weakly compact if and only if it has the generic fixed point property for continuous affine mappings. The class of continuous affine mappings can be replaced by the class of affine mappings which are uniformly Lipschitzian with some constant M > 1 in the case of c0, the class of affine mappings which are uniformly Lipschitzian with some constant M > √6 in the case of quasi-reflexive James’ space J and the class of nonexpansive affine mappings in the case of L-embedded spaces.Dirección General de Enseñanza SuperiorJunta de AndalucíaState Committee for Scientific Research (Poland

From freeze-dried precursors to microwave sintered Al2O3-ZrO2 composites

[EN] Homogeneous Al2O3-Zr0.91Y0.09O1.955 (65-35 mol%) nanopowders have been prepared in a wide temperature range (from 1073 to 1573 K) by thermal decomposition of amorphous precursors, made previously by freeze-drying of appropriate solutions in air Electron microscopy images show that, whereas at low temperatures (973 K) pseudo-spherical particles constituted of Al2O3 and Zr0.91Y0.09O1.955 grains are observed (similar to 38nm), at high temperatures (1573 K) a homogeneous dispersion of nanocrystalline ZrO2-based grains (similar to 186 nm) is dispersed in the sintered Al2O3 matrix. The comparison between phase and microstructure evolution in these samples clearly indicates that the disorder at the atomic scale in the precursor makes the attainment of higher temperatures necessary for nucleation and growth of both phases. Finally, a selected material was sintered in a mono-mode microwave device at 2.45 GHz in air at 1573 and 1673 K. This fast-microwave technology allows fabrication of composites with high densities (similar to 99% TD) and excellent mechanical properties, such as hardness and Young's modulus reaching 25.6 GPa and 358 GPa, respectively.The authors would like to thank to the Generalitat Valenciana for financial support received for the project PROMETEO/2016/040 and Santiago Grisolia program scholarship (GRISOLIAP/2018/168). A. Borrell acknowledges the Spanish Ministry of Economy and Competitiveness for her RyC contract (RYC-2016-20915).Borrell Tomás, MA.; Gil-Flores, L.; Guillén-Pineda, RM.; Salvador Moya, MD. (2019). From freeze-dried precursors to microwave sintered Al2O3-ZrO2 composites. Processing and Application of Ceramics. 13(2):157-163. https://doi.org/10.2298/PAC1902157BS15716313

Factores situacionales y disposicionales como predictores de la ansiedad y autoconfianza precompetitiva en deportistas universitarios

Apoyados en la teoría de la autodeterminación y la teoría de lasmetas de logro, el objetivo del presente estudio fue poner a prueba dos modelosque examinan secuencialmente las relaciones entre factores situacionales(clima motivacional creado por el entrenador), factores disposicionales(orientaciones de meta y regulaciones motivacionales), y consecuenciasde ansiedad y autoconfianza precompetitivas (considerando sus dimensionesde intensidad y dirección). También se analizó el papel mediador de lasorientaciones de meta y de las regulaciones motivacionales, en la relaciónentre el clima motivacional y la ansiedad y autoconfianza precompetitivas.Se utilizó un diseño transversal de recogida de datos; y para probar los modeloshipotetizados se utilizaron modelos de ecuaciones estructurales. 211deportistas universitarios de ambos géneros (M = 19.97 años de edad; DT =2.01) respondieron al PMCSQ-2, al TEOSQ, a la SMS y al CSAI-2R conescala de dirección. Los resultados apoyaron parcialmente los modelos propuestos.También constataron el papel mediador de la orientación a la tareay de la no motivación con respecto a la relación entre el clima de implicaciónen la tarea y la ansiedad somática; mientras que la orientación a la tareay la motivación autónoma mediaron parcialmente la relación entre el climade implicación en la tarea y dirección de autoconfianza. Los resultados sonanalizados y discutidos en línea con los marcos teóricos de referencia

Fabrication and characterization of Nb2O5-doped 3Y-TZP materials sintered by microwave technology

[EN] The purpose of this research is focused on the manufacture and characterization of a partially stabilized zirconia ceramic with 3 mol% of Yttria and doped with .5 and 1.5 mol% of Nb2O5 to analyze the influence of doping, with the purpose of improving the properties before hydrothermal degradation. In the first instance, the microwave sintering process was used for the consolidation of this material, then the physical and mechanical properties were characterized. Together, the results obtained by the conventional sintering process were compared. A low hydrothermal degradation study (LTD) is presented at low temperatures in which possible changes in the mechanical properties of the ceramic materials are analyzed and its influence on the phase transformation that zirconia may present is observed. The mechanical properties were evaluated through hardness, fracture toughness, and Young's modulus tests. Likewise, their density was analyzed, and microstructure was characterized by FESEM. It was found that the microwave-sintered samples at 1200 degrees C exhibited superior properties of toughness than even samples sintered by conventional methods at higher temperatures (1400 degrees C). The sample of 3Y-TZP with 1.5 mol% Nb2O5 sintered by microwave with <.2% of porosity achieved a maximum fracture toughness value around 40% higher than the dense monolithic 3Y-TZP material.Santiago Grisolia program, Grant/Award Number: GRISOLIAP/2018/168; Ministry of Science, Innovation and Universities (Spain), Grant/Award Numbers: RTI2018-099033-B-C32, RYC-2016-20915Guillén-Pineda, RM.; Salvador Moya, MD.; Gutiérrez-González, CF.; Catalá Civera, JM.; Borrell Tomás, MA. (2021). Fabrication and characterization of Nb2O5-doped 3Y-TZP materials sintered by microwave technology. International Journal of Applied Ceramic Technology. 18(6):2033-2044. https://doi.org/10.1111/ijac.138572033204418

Speech Translation Statistical System for Teaching Environments and Conference Speeches

The synergic combination of different sources of knowledge is a key aspect in the development of modern statistical translators. The effect and implications of adding additional other-than-voice information in a voice translation system for teaching environments and conference speakers is described in this work. The additional information serves as the bases for the log-linear combination of several statistical models. A prototype that implements a real-time speech translation system from Spanish to English is presented. In the scenario of analysis a teacher, or presenter, as speaker giving its presentation could use a real time translation system for foreign students or participants. The speaker could add slides or class notes as additional reference to the voice translation system. Should notes be already translated into the destination language the system could have even more accuracy. In this paper, first, we present the theoretical framework of the problem, then, we summarize the overall architecture of the system, next, we specify the speech recognition module and the machine translation module, then, we show how the system is enhanced with capabilities related to capturing the additional information, and, finally, we present the performance results of the developed system.Tomás Gironés, J.; Canovas Solbes, A.; Lloret, J.; García Pineda, M. (2011). Speech Translation Statistical System for Teaching Environments and Conference Speeches. International Journal on Advances in Intelligent Systems. 4(1):20-30. http://hdl.handle.net/10251/46962S20304