Suchergebnisse

6 páginas, 4 figuras.-- El pdf del artículo es la versión pre-print. ; We study the optical excitation of high-order surface plasmon resonance modes in individual Ag nanorice particles using dark-field scattering spectroscopy. We analyze the results by model calculations using the boundary element method. Symmetry breaking caused by oblique illumination makes the even order resonance modes observable in the optical spectrum. All the resonance peaks are found to redshift with increasing length of the particle. ; This work is supported by NSFC Grant Nos. 10625418 and 10874233, and MOST Grant Nos. 2006DFB02020, 2007CB936800, and 2009CB930700, "Bairen Project" of CAS. P.N. acknowledges financial support from The Robert A Welch Foundation, grant C-1222. J.A. and A.R. acknowledge financial support from Etortek project inanoGUNE from the Basque Government and project FIS2007-66711-C01-01 from the Spanish Ministry of Science and Innovation. ; Peer reviewed

For more than 40 years, the industrial complex which developed near Huelva (in SW Spain) produced a huge amount of phosphogypsum as a waste product of manufacturing fertilizers. This waste was stockpiled in a stack 25 m high, covering 1200 ha of what was once a salt marsh. The weight of that enormous amount of waste produced active subsidence in the underlying sediment. Part of the sediment was injected into the marginal areas, where the load pressure is minor, causing significant vertical movement in the floor of the estuarine channel. This manuscript describes several surficial features using multibeam echosound. A crest formed by cones and a bulge area could be interpreted as injection structures. The evolution of the topographic position of the floor was also analyzed by comparing different records of the estuarine bed in the margins of the stockpile. The data in this work document the changes in the dynamics of the estuary in relation to these vertical movements. These changes in dynamicsled to erosion and deposition in various areas of the bed ; This research was funded by the project "Balsas de Fosfoyesos", Especial action 2017–2020 of the Junta de Andalucia (Regional government): General Direction of Universities and co-funded by the Ayuntamiento de Huelva (City Council of Huelva). We strongly acknowledge the technical support given by A. Palmeiro from Nautilus Oceanica S.L., who filtered and processed the multibeam records. We also acknowledge the comments of three anonymous reviewers who contributed to substantially improving this article. The help of Alastair Peacocke regarding the English language also improved the original manuscrip

This research is based on a descriptive methodology regarding the main urban-architectural typological characteristics of the historic cities of Puebla, Havana and Quito, emphasizing current legislation and conservation policies for their protection. This is due to its complex and diversified political-administrative, cultural, tourist, etc. functions, which continue to maintain a certain homogeneity. However, some interventions jeopardize the conservation and preservation of their tangible and intangible cultural heritage. Therefore, this research is focused on analyzing and comparing regulatory plans and planning tools aimed at both the commercialization and the rehabilitation of the cultural identity of these Novo-Hispanic cities that currently play a relevant role as cultural heritage cities of humanity references Worldwide.

This research is based on a descriptive methodology regarding the main urban-architectural typological characteristics of the historic cities of Puebla, Havana and Quito, emphasizing current legislation and conservation policies for their protection. This is due to its complex and diversified political-administrative, cultural, tourist, etc. functions, which continue to maintain a certain homogeneity. However, some interventions jeopardize the conservation and preservation of their tangible and intangible cultural heritage. Therefore, this research is focused on analyzing and comparing regulatory plans and planning tools aimed at both the commercialization and the rehabilitation of the cultural identity of these Novo-Hispanic cities that currently play a relevant role as cultural heritage cities of humanity references Worldwide. ; Esta investigación se sustenta en una metodología descriptiva respecto a las principales características tipológicas urbano-arquitectónicas de las ciudades históricas de Puebla, La Habana y Quito, haciendo énfasis en la legislación actual y políticas de conservación para su protección. Esto debido a sus complejas y diversificadas funciones político-administrativas, culturales, turísticas etc., que siguen manteniendo cierta homogeneidad. No obstante, algunas intervenciones ponen en riesgo la conservación y preservación de su patrimonio cultural material e inmaterial. Por lo tanto, esta investigación está enfocada a analizar y comparar los planes regulatorios y herramientas de planeación dirigidos tanto a la mercantilización como a la rehabilitación de la identidad cultural de estas ciudades novohispanas que cumplen actualmente un papel relevante como ciudades patrimonio cultural de la humanidad referentes a nivel mundial.

As cities expand, human mobility has become a central focus of urban planning and policy making to make cities more inclusive and sustainable. Initiatives such as the "15-minutes city" have been put in place to shift the attention from monocentric city configurations to polycentric structures, increasing the availability and diversity of local urban amenities. Ultimately they expect to increase local walkability and increase mobility within residential areas. While we know how urban amenities influence human mobility at the city level, little is known about spatial variations in this relationship. Here, we use mobile phone, census, and volunteered geographical data to measure geographic variations in the relationship between origin-destination flows and local urban accessibility in Barcelona. Using a Negative Binomial Geographically Weighted Regression model, we show that, globally, people tend to visit neighborhoods with better access to education and retail. Locally, these and other features change in sign and magnitude through the different neighborhoods of the city in ways that are not explained by administrative boundaries, and that provide deeper insights regarding urban characteristics such as rental prices. In conclusion, our work suggests that the qualities of a 15-minutes city can be measured at scale, delivering actionable insights on the polycentric structure of cities, and how people use and access this structure. ; E.G-G., F.S-B., F.M.C. and P.R. were partly supported by the H2020 IoTwins project (Distributed Digital Twins for industrial SMEs: a big-data platform) funded by the EU under the call ICT-11-2018-2019, Grant Agreement No 857191. E.G-G. was partly funded by ANID Fondecyt de Iniciación 11180913. ; Peer Reviewed ; Postprint (published version)

19 páginas, 12 figuras.-- PACS number(s): 73.20.Mf, 68.37.Ma, 42.50.Wk, 41.75.Fr ; The total momentum transfer from fast electron beams, like those employed in scanning transmission electron microscopy (STEM), to plasmonic nanoparticles is calculated. The momentum transfer is obtained by integrating the electromagnetic forces acting on the particles over time. Numerical results for single and dimer metallic nanoparticles are presented, for sizes ranging between 2 and 80 nm. We analyze the momentum transfer in the case of metallic dimers where the different relevant parameters such as particle size, interparticle distance, and electron beam impact parameter are modified. It is shown that depending on the specific values of the parameters, the total momentum transfer yields a force that can be either attractive or repulsive. The time-average forces calculated for electron beams commonly employed in STEM are on the order of piconewtons, comparable in magnitude to optical forces and are thus capable of producing movement in the nanoparticles. This effect can be exploited in mechanical control of nanoparticle induced motion. ; Financial support from the Department of Industry of the Basque Government through the ETORTEK project inano, from the Spanish Ministerio de Ciencia e Innovación through Project No. FIS207-066711-C02-00, from the Consejo Nacional de Ciencia y tecnología (Mexico) through Project No. 82073, and from the U.S. NSF under Grant No. 0959905 are acknowledged. ; Peer reviewed

Preliminares. Presentación, pág. 1; Introducción, pág.3; Capítulo 1. Conflicto armado y derecho humanitario en Colombia, pág. 11; Capítulo 2. Antecedentes y perspectivas de la política de paz, pág. 47; Capítulo 3. Colombia y América Latina en las relaciones internacionales contemporáneas, pág. 87; Capítulo 4. Colombia, América Latina y el Caribe: Una presencia precaria en el movimiento de países no alineados, pág. 109; Capítulo 5. Colombia, política exterior y no alineamiento: entre la expectativa y la disyuntiva, pág. 129; Capítulo 6. Colombia, las Naciones Unidas y el movimiento de países no alineados, pág. 159; Capítulo 7. Violencia y salud en Colombia, pág. 205; Capítulo 8. La lucha por las siete llaves: Minorías étnicas en Colombia, pág. 237; Capítulo 9. Mujer Siglo XXI: hacia la construcción de un nuevo paradigma de feminidad, pág. 267; Capítulo 10. Las mafias, la crisis política y las perspectivas de guerra civil, pág. 285; Capítulo 11. Origen, desarrollo y desenlace del Caligate, pág, 299

In this paper, the Camp Nou stadium is used as a testbed for City Physiology, a theoretical framework for urban digital twins. With this case study, the modularity and adaptability of the framework, originally intended for city-scale simulations, are tested on a large facility venue. As a proof of concept, several statistical techniques and an agent-based simulation platform are coupled to simulate a crowd in the stadium, and a process of four steps is followed to build the case study. Both the conceptual (interdomain) and technical (domain specific) layers of the digital twin are defined and connected in a nonlinear process so that they represent the complexity of the object to be simulated. &e result obtained is a strategy to build a digital twin from the domain point of view, paving the way for more complex, more ambitious simulators ; This project has received funding from the European Union's Horizon 2020 Research and Innovation Programme under the IoTwins Project (Grant agreement no. 857191). I. Meta was partially funded by the Agencia Estatal de Investigación-Ministerio de Ciencia Innovación (AEI MICINN) and the European Social Fund (ESF) under the FPI program (scholarship no. PRE2019-090239). ; Peer Reviewed ; Postprint (published version)