A new self-organizing neural gas model based on Bregman divergences

In this paper, a new self-organizing neural gas model that we call Growing Hierarchical Bregman Neural Gas (GHBNG) has been proposed. Our proposal is based on the Growing Hierarchical Neural Gas (GHNG) in which Bregman divergences are incorporated in order to compute the winning neuron. This model has been applied to anomaly detection in video sequences together with a Faster R-CNN as an object detector module. Experimental results not only confirm the effectiveness of the GHBNG for the detection of anomalous object in video sequences but also its selforganization capabilities.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tec

Effect of preparation conditions on the polymorphism and transport properties of lanthanum molybdates

In this work, La6MoO12-based compounds were investigated as part of a new family of materials very competitive as hydrogen separation membranes [1,2]. La5.4MoO11.1 was synthesized by the freeze-drying precursor method and the calcination conditions were optimized in order to obtain single phases. Several cooling rates were applied and different polymorphs were obtained: a simple cubic fluorite symmetry (Fm-3m) for the sample cooled by quenching, and two different rhombohedral (R-3) space groups for the samples cooled at 50 ºC•min-1 and 0.5 ºC•min-1 (see Figure below). For the quenched sample, the Rietveld refinement was satisfactory in a Fm-3m space group. For the other two compositions no structural model was available and were indexed in a R-3 space group, however some small reflections were not given any intensity by the model used. Transmission electron microscopy confirmed the presence of superstructures for those samples. All ceramic materials were obtained with relative densities close to 100% after sintering at 1500 ºC. Stability studies demonstrated that all three polymorphs were stable in oxidizing and reducing conditions at 800 ºC for 48 hours. The three samples present a significant proton contribution to the conductivity at temperatures lower than 800 ºC. These results were confirmed by thermogravimetric analysis. The highest conductivity values were observed for the samples prepared by quenching. The three polymorphs display a small p-type electronic contribution to the overall conductivity in oxidizing conditions and n-type electronic one in very reducing conditions, much more significant for the samples cooled by quenching and at 50 ºC•min-1.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

Tratamiento del Síndrome del Túnel Carpiano con la Técnica del Retinaculotomo de PAINE

Los autores han realizado un estudio con 36 casos intervenidos quirúrgicamente en el Servicio de Neurocirugía del Hospital General de Especialidades "Virgen de las Nieves" de Granada, tanto a corto como a largo plazo, empleando la técnica quirúrgica de PAINE, basada en el instrumento por él diseñado, el retinaculotomo. Realizan un estudio de los resultados obtenidos, siendo totalmente satisfactorios en el 74% de los casos. Finalmente exponen las ventajas de esta técnica quirúrgica, así como, la práctica ausencia de complicaciones.36 Patients with Carpal Tunnel Syndrome are colected. All of them -were operated on by PAINE's Technique and Procedur e (Retinaculotome). The authors made a study of the results obtained, 74% of good results. Finally, they explain the advantage s of this surgical procedure, as well as, absence of complications

Interaction of molecular and atomic hydrogen with (5,5) and (6,6) single-wall carbon nanotubes

Density functional theory has been used to study the interaction of molecular and atomic hydrogen with (5,5) and (6,6) single-wall carbon nanotubes. Static calculations allowing for different degrees of structural relaxation are performed, in addition to dynamical simulations. Molecular physisorption inside and outside the nanotube walls is predicted to be the most stable state of those systems. The binding energies for physisorption of the H2 molecule outside the nanotube are in the range 0.04–0.07 eV. This means that uptake and release of molecular hydrogen from nanotubes is a relatively easy process, as many experiments have proved. A chemisorption state, with the molecule dissociated and the two hydrogen atoms bonded to neighbor carbon atoms, has also been found. However, reaching this dissociative chemisorption state for an incoming molecule, or starting from the physisorbed molecule, is difficult because of the existence of a substantial activation barrier. The dissociative chemisorption deforms the tube and weakens the C-C bond. This effect can catalyze the shattering and scission of the tube by incoming hydrogen molecules with sufficient kinetic energy.This work was supported by DGESIC (Grant No. PB98-0345) and European Community (RTN-COMELCAN). We acknowledge the computational facilities provided by CESCA and CEPBA.Peer reviewe

Improving integrability via absolute summability: a general version of Diestel s Theorem

[EN] A classical result by J. Diestel establishes that the composition of a summing operator with a (strongly measurable) Pettis integrable function gives a Bochner integrable function. In this paper we show that a much more general result is possible regarding the improvement of the integrability of vector valued functions by the summability of the operator. After proving a general result, we center our attention in the particular case given by the -absolutely continuous operators, that allows to prove a lot of special results on integration improvement for selected cases of classical Banach spaces-including C(K), and Hilbert spaces-and operators-p-summing, (q, p)-summing and p-approximable operators.D. Pellegrino acknowledges with thanks the support of CNPq Grant 401735/2013-3 (Brazil). P. Rueda acknowledges with thanks the support of the Ministerio de Economia y Competitividad (Spain) MTM2011-22417. E.A. Sanchez Perez acknowledges with thanks the support of the Ministerio de Economia y Competitividad (Spain) MTM2012-36740-C02-02.Pellegrino, D.; Rueda, P.; Sánchez Pérez, EA. (2016). Improving integrability via absolute summability: a general version of Diestel s Theorem. Positivity. 20(2):369-383. https://doi.org/10.1007/s11117-015-0361-5S369383202Botelho, G., Pellegrino, D., Rueda, P.: A unified Pietsch domination theorem. J. Math. Anal. Appl. 365(1), 269–276 (2010)Defant, A., Floret, K.: Tensor norms and operator ideals. North-Holland, Amsterdam (1992)Diestel, J.: An elementary characterization of absolutely summing operators. Math. Ann. 196, 101–105 (1972)Diestel, J., Jarchow, H., Tonge, A.: Absolutely summing operators. Cambridge University Press, Cambridge (1995)Farmer, J., Johnson, W.B.: Lipschitz p-summing operators. Proc. Amer. Math. Soc. 137, 2989–2995 (2009)Jarchow, H.: Localy convex, spaces. Teubner, Stuttgart (1981)López Molina, J.A., Sánchez Pérez, E.A.: Ideales de operadores absolutamente continuos, Ciencias Exactas, Físicas y Naturales, Madrid. Rev. Real Acad. 87, 349–378 (1993)López Molina, J.A., Sánchez Pérez, E.A.: The associated tensor norm to $$(q, p)$$ ( q , p ) -absolutely summing operators on $$C(K)$$ C ( K ) -spaces. Czec. Math. J. 47(4), 627–631 (1997)López, J.A., Molina, Sánchez-Pérez, E.A.: On operator ideals related to $$(p,\sigma )$$ ( p , σ ) -absolutely continuous operator. Studia Math. 131(8), 25–40 (2000)Matter, U.: Absolute continuous operators and super-reflexivity. Math. Nachr. 130, 193–216 (1987)Pellegrino, D., Santos, J.: A general Pietsch domination theorem. J. Math. Anal. Appl. 375(1), 371–374 (2011)Pellegrino, D., Santos, J., Seoane-Sepúlveda, J.B.: Some techniques on nonlinear analysis and applications. Adv. Math. 229, 1235–1265 (2012)Pietsch, A.: Operator Ideals. Deutsch. Verlag Wiss., Berlin, 1978; North-Holland, Amsterdam-London-New York-Tokyo (1980)Pisier, G.: Factorization of operators through $$L_{p\infty }$$ L p ∞ or $$L_{p1}$$ L p 1 and noncommutative generalizations. Math. Ann. 276(1), 105–136 (1986)Rodríguez, J.: Absolutely summing operators and integration of vector-valued functions. J. Math. Anal. Appl. 316(2), 579–600 (2006

Microencapsulation of cerium and its application in sol-gel coatings for the corrosion protection of aluminum alloy AA2024

[EN] Cerium-containing microcapsules were obtained by means of water/oil (W/O) emulsion technology using tetraethyl orthosilicate (TEOS) as the precursor. Synthesis parameters as water/ethanol molar ratio, surfactant concentration, temperature, synthesis time, were optimized to obtain microcapsules with adequate form and size. Cerium salt is a corrosion inhibitor. Scanning electron microscopy (SEM) was employed to characterize the microcapsules and EDS and energy dispersive X-ray (EDX) microanalysis to assess encapsulation of cerium. The synthesized microcapsules were incorporated in the sol-gel coating that was sprayed on AA2024 aluminum alloy. The morphology of the sol-gel coating and the distribution of the microcapsules were investigated by SEM and EDX and the corrosion resistance of the coated samples was evaluated by electrochemical impedance spectroscopy (EIS) and open circuit potential measurements. Cerium microcapsules can act as Ce nanoreservoirs blocking defects produced in the organic-inorganic hybrid coating by precipitating Ce oxide/ hydroxide and nanoloads slowing the diffusion of redox species to the aluminum surface. Higher corrosion resistance was obtained with microencapsulation of cerium than with nonencapsulated cerium.Authors wish to thank to the Instituto Valenciano de Competitividad Empresarial (IVACE) (project reference IMAMCC/2016/1) for the financial support. Electron Microscopy Service of the UPV (Universitat Politecnica de Valencia) is gratefully acknowledged for help with FESEM and EDX characterization.Valero-Gómez, A.; Molina Puerto, J.; Pradas, S.; López-Tendero, MJ.; Bosch, F. (2020). Microencapsulation of cerium and its application in sol-gel coatings for the corrosion protection of aluminum alloy AA2024. Journal of Sol-Gel Science and Technology. 93(1):36-51. https://doi.org/10.1007/s10971-019-05151-8S3651931Nace International, International measures of prevention, application, and economics of corrosion technology study (2016). http://impact.nace.org/documents/Nace-International-Report.pdf . Accessed 12 Apr 2019.Yadla SV, Sridevi V, Lakshmi MVVC, Kumari SPK (2012) A review on corrosion of metals and protection. Int J Eng Sci Adv Technol 2:637–644Dariva CG, Galio AF (2014) Corrosion inhibitors – principles, mechanisms and applications. In: Aliofkhazraei M (ed), Developments in Corrosion Protection. InTech, London. https://www.intechopen.com/books/developments-in-corrosion-protection/corrosion-inhibitors-principles-mechanisms-and-applicationsRani BEA, Basu BBJ (2012) Green inhibitors for corrosion protection of metals and alloys: an overview. Int J Corros 2012:380217. https://www.hindawi.com/journals/ijc/2012/380217/Gece G (2012) Drugs: a review of promising novel corrosion inhibitors. Corros Sci 53:3873–3898Raja PB, Sethuraman MG (2008) Natural products as corrosion inhibitor for metals in corrosive media—a review. Mater Lett 62:113–116Umoren SA, Solomon MM (2017) Synergistic corrosion inhibition effect of metal cations and mixtures of organic compounds: a review. J. Environ Chem Eng 5:246–273Ivušić F, Lahodny-Šarc O, Curković HO, Alar V (2015) The synergistic inhibition of carbon steel corrosion in seawater by cerium chloride and sodium gluconate. Corros Sci 98:88–97Yasakau KA, Zheludkevich ML, Lamaka SV, Ferreira MGS (2006) Mechanism of corrosion inhibition of AA2024 by rare-earth compounds. J Phys Chem B 110:5515–5528Hughes AE, Mol JMC, Cole IS (2015) Coatings for corrosion prevention based on rare earths. In: M Forsyth, B Hinton (ed), Rare earth-based corrosion inhibitors. Woodhead Publishing, Sawston, Cambridge. https://www.elsevier.com/books/rare-earth-based-corrosion-inhibitors/forsyth/978-0-85709-347-9Figueira RB, Silva CJR, Pereira EV (2015) Organic–inorganic hybrid sol–gel coatings for metal corrosion protection: a review of recent progress. J Coat Technol Res 12:1–35Danks AE, Hall SR, Schnepp Z (2016) The evolution of ‘sol–gel’ chemistry as a technique for materials synthesis. Mater Horiz 3:91–112Kumar N, Subasri R (2012) Corrosion protection and self-healing by sol-gel process: a review of recent patent literature. Recent Pat Corros Sci 2:148–163Montemor MF (2014) Functional and smart coatings for corrosion protection: a review of recent advances. Surf Coat Technol 258:17–37Palomino LM, Suegama PH, Aoki IV, Montemor MF, De Melo HG (2009) Electrochemical study of modified cerium–silane bi-layer on Al alloy 2024-T3. Corros Sci 51:1238–1250Hammer P, Schiavetto MG, dos Santos FC, Benedetti AV, Pulcinelli SH, Santilli CV (2010) Improvement of the corrosion resistance of polysiloxane hybrid coatings by cerium doping. J Non-Cryst Solids 356:2606–2612Suegama PH, Sarmento VHV, Montemor MF, Benedetti AV, de Melo HG, Aoki IV, Santilli CV (2010) Effect of cerium (IV) ions on the anticorrosion properties of siloxane-poly(methyl methacrylate) based film applied on tin coated steel. Electrochim Acta 55:5100–5109Capelossi VR, Aoki IV (2013) Influence of sonication on anticorrosion properties of a sulfursilane film dopped with Ce (IV) on galvannealed steel. Prog Org Coat 76:812–820Paussa L, Rosero NC, Navarro NC, Bravin D, Andreatta F, Lanzutti A, Aparicio M, Durán A, Fedrizzi L (2012) ZrO2 sol–gel pre-treatments doped with cerium nitrate for the corrosion protection of AA6060. Prog Org Coat 74:311–319Silva FS, Suegama PH, Silva WP, Rinaldi AW, Domingues NLC, Matsumoto MY, Salazar LG (2015) Effect of different dopants in films TEOS/MPTS used to protect the carbon steel. Mater Sci Forum 805:167–171Rosero-Navarro NC, Pellice SA, Durán A, Aparicio M (2008) Effects of Ce-containing sol–gel coatings reinforced with SiO2 nanoparticles on the protection of AA2024. Corros Sci 50:1283–1291Naderi R, Fedel M, Deflorian F, Poelman M, Olivier M (2013) Synergistic effect of clay nanoparticles and cerium component on the corrosion behavior of eco-friendly silane sol–gel layer applied on pure aluminum. Surf Coat Technol 224:93–100Zadeh MA, Garcia SJ, van der Zwaag S (2013) Routes to extrinsic and intrinsic self-healing corrosion protective sol-gel coatings: a review. Self Heal Mater 1:1–18Matsuda T, Jadhav N, Kashi KB, Jensen M, Suryawanshi A, Gellinga VJ (2016) Self-healing ability and particle size effect of encapsulated cerium nitrate into pH sensitive microcapsules. Prog Org Coat 90:425–430Abourayana HM, Dowling DP (2015) Plasma processing for tailoring the surface properties of polymers. In: Aliofkhazraei M (ed), Surface energy. InTech, London. https://www.intechopen.com/books/surface-energyZille A, Oliveira FR, Souto AP (2015) Plasma treatment in textile industry. Plasma Process Polym 12:98–131Williams DF, Kellar EJC, Jesson DA, Watts JF (2017) Surface analysis of 316 stainless steel treated with cold atmospheric plasma. Appl Surf Sci 403:240–247Kim MC, Yang SH, Boo J-H, Han JG (2003) Surface treatment of metals using an atmospheric pressure plasma jet and their surface characteristics. Surf Coat Technol 174–175:839–844Ciriminna R, Sciortino M, Alonzo G, de Schrijver A, Pagliaro M (2011) From molecules to systems: sol-gel microencapsulation in silica-based materials. Chem Rev 111:765–789Ciriminna R, Fidalgo A, Pandarus V, Béland F, Ilharco LM, Pagliaro M (2013) The sol−gel route to advanced silica-based materials and recent applications. Chem Rev 113:6592–6620Kesmez Ö, Burunkaya E, Kiraz N, Çamurlu HE, Asiltürk M, Arpaç E (2011) Effect of acid, water and alcohol ratios on sol-gel preparation of antireflective amorphous SiO2 coatings. J Non-Cryst Solids 357:3130–3135Bruker, Periodic table of elements and X-ray energies. https://www.bruker.com/fileadmin/user_upload/8-PDF-Docs/X-rayDiffraction_ElementalAnalysis/HH-XRF/Misc/Periodic_Table_and_X-ray_Energies.pdf . Accessed 12 April 2019Suegama PH, de Melo HG, Benedetti AV, Aoki IV (2009) Influence of cerium (IV) ions on the mechanism of organosilane polymerization and on the improvement of its barrier properties. Electrochim Acta 54:2655–2662Fedel M, Callone E, Fabbiana M, Deflorian F, Dirè S (2017) Influence of Ce3+ doping on molecular organization of Si-based organic/inorganic sol-gel layers for corrosion protection. Appl Surf Sci 414:82–91National Institute of Advanced Industrial Science and Technology (AIST), Spectral database for organic compounds SDBS. http://sdbs.db.aist.go.jp/sdbs/cgi-bin/direct_frame_top.cgi . Accessed 12 April 2019Garcia-Heras M, Jiménez-Morales A, Casal B, Galvan JC, Radzki S, Villegas MA (2004) Preparation and electrochemical study of cerium–silica sol–gel thin films. J Alloy Compd 380:219–224Innocenzi P (2003) Infrared spectroscopy of sol–gel derived silica-based films: a spectra-microstructure overview. J Non-Cryst Solids 316:309–319Peng S, Zhao W, Zeng Z, Li H, Xue Q, Wu X (2013) Preparation of anticorrosion hybrid silica sol–gel coating using Ce(NO3)3 as catalyst. J Sol–Gel Sci Technol 66:133–138Kappert EJ, Pavlenko D, Malzbender J, Nijmeijer A, Benes NE, Tsai PA (2015) Formation and prevention of fractures in sol–gel-derived thin films. Soft Matter 11:882–888Chang B-Y, Park S-M (2010) Electrochemical impedance spectroscopy. Annu Rev Anal Chem 3:207–229Wang H, Akid R (2008) Encapsulated cerium nitrate inhibitors to provide high-performance anti-corrosion sol–gel coatings on mild steel. Corros Sci 50:1142–1148Ramezanzadeh B, Ahmadi A, Mahdavian M (2016) Enhancement of the corrosion protection performance and cathodic delamination resistance of epoxy coating through treatment of steel substrate by a novel nanometric sol-gel based silane composite film filled with functionalized graphene oxide nanosheets. Corros Sci 109:182–205Ahmadi A, Ramezanzadeh B, Mahdavian M (2016) Hybrid silane coating reinforced with silanized graphene oxide nanosheets with improved corrosion protective performance. RSC Adv 6:54102–54112Santana I, Pepe A, Schreiner W, Pellice S, Ceré S (2016) Hybrid sol-gel coatings containing clay nanoparticles for corrosion protection of mild steel. Electrochim Acta 203:396–40

Effects of web-based electrocardiography simulation on strategies and learning styles

Objective: To identify the association between the use of web simulation electrocardiography and the learning approaches, strategies and styles of nursing degree students. Method: A descriptive and correlational design with a one-group pretest– posttest measurement was used. The study sample included 246 students in a Basic and Advanced Cardiac Life Support nursing class of nursing degree. Results: No significant differences between genders were found in any dimension of learning styles and approaches to learning. After the introduction of web simulation electrocardiography, significant differences were found in some item scores of learning styles: theorist (p < 0.040), pragmatic (p < 0.010) and approaches to learning. Conclusion: The use of a web electrocardiogram (ECG) simulation is associated with the development of active and reflexive learning styles, improving motivation and a deep approach in nursing students

Longitudinal study of the learning styles evolution in Engineering degrees

A learning style describes what are the predominant skills for learning tasks. In the context of university education, knowing the learning styles of the students constitutes a great opportunity to improve both teaching and evaluation. By using the Honey-Alonso Learning Styles Questionnaire (CHAEA), in this work, we carried out a longitudinal study of the correlation between marks and the results of the survey. The 2018/2019, 2019/2020, and 2020/2021 academic years in two different courses from Computer Sciences engineering degrees were studied. The results were analyzed in order to evaluate the impact of the adaptation to digital lessons during the last year.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

Peer assessments in Engineering: A pilot project

The evaluation methods employed in a course are the most important point for the students, above any other learning aspect. For teachers, this task is arduous when the number of students is high. Traditional evaluation requires the teacher to grade all the assignments and exams, while peer assessments have become a valuable tool to involve students effectively in the correction of exercises. This paper applied and analyzes the evaluation through peer review in a course of Computer Sciences Engineering. A total of six assignments and a mid-term exam were evaluated by both teachers (individually) and students (cooperatively), and the differences were discussed to extract conclusions about the viability of this evaluation model.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech