870 research outputs found
Superluminal Localized Solutions To Maxwell Equations Propagating Along A Waveguide: The Finite-energy Case.
In a previous paper we have shown localized (nonevanescent) solutions to Maxwell equations to exist, which propagate without distortion with superluminal speed along normal-sized waveguides, and consist in trains of X-shaped beams. Those solutions possessed infinite energy. In this paper we show how to obtain, by contrast, finite-energy solutions, with the same localization and superluminality properties.6703662
Simultaneous state initialization and gyroscope bias calibration in visual inertial aided navigation
State of the art approaches for visual-inertial sensor fusion use filter-based or optimization-based algorithms. Due to the nonlinearity of the system, a poor initialization can have a dramatic impact on the performance of these estimation methods. Recently, a closed-form solution providing such an initialization was derived in [1]. That solution determines the velocity (angular and linear) of a monocular camera in metric units by only using inertial measurements and image features acquired in a short time interval. In this letter, we study the impact of noisy sensors on the performance of this closed-form solution. We show that the gyroscope bias, not accounted for in [1], significantly affects the performance of the method. Therefore, we introduce a new method to automatically estimate this bias. Compared to the original method, the new approach now models the gyroscope bias and is robust to it. The performance of the proposed approach is successfully demonstrated on real data from a quadrotor MAV
Jamming Signal Immunity Tests on GSM-R Communications Compared to EMC Basic Standards
This paper presents the work being done in SECRET
project (European Program FP7/2007-2013 under grant agreement
number “285136”) to strengthen the European rail network against
the potential jamming of the railway communications.
Standardized immunity tests, currently conducted on
communication equipment in the presence of electromagnetic (EM)
interferences are presented. It then presents the tests carried out in
SECRET to assess the resistance of railway communication systems
face the signals generated by telecommunication jammers.SECRE
Imagens no presídio e as poses de “joinha” – Estamos todos bem
O trabalho apresenta uma análise das imagens produzidas a partir de oficinas defotografia realizadas em dois presídios localizados em Porto Alegre. A partir denoções trazidas por Catherine Tambrun sobre a impossibilidade do agente externo fotografar nesses ambientes, pretende discutir que especificidades apresentam as Imagens feitas pelos próprios presos, contrapondo noções de imagens da prisão e aprisionamentos da imagem e, ao mesmo tempo, as aproximando de discussões sobre as vidas precárias trazidas por Judtih Butler.AbstractThis article discusses the reconstruction of memory through two photographic This study analyzes images produced during photography workshops that took place in two prisons, located in Porto Alegre/Brazil; the attendees were comprised of groups of inmates. For Catherine Tambrun, it is impossible for an external agent to photograph these places. Her concepts were used to highlight what specifics were present in the images approximating them to discussions brought forth by Judith Butler with respect to precarious lives, in opposition to general notions of prison images and the imprisonment of images
About Superluminal motions and Special Relativity: A Discussion of some recent Experiments, and the solution of the Causal Paradoxes
Some experiments, performed at Berkeley, Cologne, Florence, Vienna, Orsay,
Rennes, etc., led to the claim that something seems to travel with a group
velocity larger than the speed c of light in vacuum. Various other experimental
results seem to point in the same direction: For instance, localized wavelet-
type solutions to Maxwell equations have been found, both theoretically and
experimentally, that travel with superluminal speed. [Even muonic and
electronic neutrinos [it has been proposed] might be "tachyons", since their
square mass appears to be negative]. With regard to the first-mentioned
experiments, it was recently claimed by Guenter Nimtz that those results with
evanescent waves (or tunneling photons) imply superluminal signal and impulse
transmission, and therefore violate Einstein causality. In this note we want to
stress that, on the contrary, all such results do not place relativistic
causality in jeopardy, even if they referred to actual tachyonic motions: In
fact, Special Relativity can cope even with superluminal objects and waves. For
instance, it is possible (at least in microphysics) to solve also the known
causal paradoxes, devised for faster than light motion, although this is not
widely recognized yet. Here we show, in detail and rigorously, how to solve the
oldest causal paradox, originally proposed by Tolman, which is the kernel of
many further tachyon paradoxes (like J.Bell's, F.A.E.Pirani's, J.D.Edmonds' and
others'). The key to the solution is a careful application of tachyon
mechanics, as it unambiguously follows from special relativity. At Last, in one
of the two Appendices, we propose how to evaluate the group-velocity in the
case of evanescent waves. [PACS nos.: 03.30.+p; 03.50.De; 41.20.Jb; 73.40.Gk;
84.40.Az; 42.82.Et ]Comment: LaTeX file: 26 pages, with 5 Figures (and two Appendices). The
original version of this paper appeared in the Journal below
ENEA PAES: A Web Platform for Supporting Italian Municipalities in Sustainable Energy Action Plan
The Covenant of Mayors promotes the Sustainable Energy Action Plan (SEAP), aiming to mitigate greenhouse gas (GHG) emissions in line with the European Union’s 2030 and 2050 targets. The Covenant signatories could take enormous advantage from a digital platform that allows SEAP drafting also to no technically skilled users, like majority of them are. The Italian National Agency for New Technologies, Energy and Sustainable Economic Development (ENEA) has developed the PAES platform in order to provide digital support to public administrations (PA) adhering to the Covenant of Mayors. The platform exploits open data and it is fed by energetic data aggregated on a municipal level. The platform offers appropriate functionalities for baseline CO2 emissions inventory (BEI) filling out and a best practice (BP) simulation tool. The latter allows to contextualize each BP and to estimate its effects in terms of the main GHG emission. The BP showing the best estimation results can then be converted into concrete adaptation actions. So, this digital system facilitates local Italian municipalities in the strategic planning and monitoring of adaptation actions taken over time
Phenolic Characterization of Cabernet Sauvignon Wines From Different Geographical Indications of Mendoza, Argentina: Effects of Plant Material and Environment
The chemical and sensory characteristics of the wines are related to the geographical origin of the grape, as a result of the interplay between the plant material (G), its acclimatization to the environment (E) and the human factor that influences both the vineyard and the winery. The range of phenotypes that a single genotype can express depending on its environment is known as phenotypic plasticity and is the result of G × E interaction. The present study evaluated the independent and interactive effects of Cabernet Sauvignon plant materials (G: Clone 7 and Mount Eden) implanted in different geographical indications of Mendoza, Argentina (E: Agrelo, Pampa El Cepillo, Altamira and Gualtallary) according to fruit yield and phenolic profiles of wines. The experiment was carried out during 2018 and 2019 vintages using a multifactorial design. When berries reached 24 °Brix, the clusters were harvested, analyzed and wines elaborated by a standardized procedure. Then, the anthocyanin and non-anthocyanin phenolic profiles of wines were determined by high-performance liquid chromatography with diode array and fluorescence detection (HPLC-DAD–FLD). The results revealed significant G × E interactions for yield traits, including the number of clusters per plant. Differential chemical composition and quality parameters of the resulting wines, markedly affected by E, were observed; that is the geographical location of the vineyards. There were similarities in the phenolic composition between Pampa El Cepillo and Altamira, while larger differences between Agrelo and Gualtallary were observed. Gualtallary presented the highest levels of anthocyanins, quercetin and trans-resveratrol. The increased amount of these compounds in Gualtallary was associated with an increased UV-B exposure of plants at this high altitude environment. This is the first report that characterizes the effects of plant material and environment for Cabernet Sauvignon. These results are of oenological and viticulture interest for the wine industry demonstrating that the selection of the plant material and the vineyard location for Cabernet Sauvignon can considerably affect the quality attributes of wines.Fil: Muñoz, Flavio Andres. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto de Biología Agrícola de Mendoza. Universidad Nacional de Cuyo. Facultad de Ciencias Agrarias. Instituto de Biología Agrícola de Mendoza; ArgentinaFil: Urvieta, Roy Alexander. Catena Institute Of Wine.; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto de Biología Agrícola de Mendoza. Universidad Nacional de Cuyo. Facultad de Ciencias Agrarias. Instituto de Biología Agrícola de Mendoza; ArgentinaFil: Buscema, Fernando. Catena Institute Of Wine.; ArgentinaFil: Rasse, Manuel. School of Agriculture Ingenieers; FranciaFil: Fontana, Ariel Ramón. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto de Biología Agrícola de Mendoza. Universidad Nacional de Cuyo. Facultad de Ciencias Agrarias. Instituto de Biología Agrícola de Mendoza; ArgentinaFil: Berli, Federico Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto de Biología Agrícola de Mendoza. Universidad Nacional de Cuyo. Facultad de Ciencias Agrarias. Instituto de Biología Agrícola de Mendoza; Argentin
Caracterización fenólica de bayas y vinos Cabernet Franc de distintos terroir de Mendoza
Los viñedos de Mendoza se encuentran en cinco zonas que corresponden a los distintos oasis productivos y en ellas existen Indicaciones Geográficas (IG), para identificar los productos originarios de cada localidad, con diferente reputación, calidad, y características.El Cabernet Franc es un cultivar que en Argentina se encuentra presente en todas las provincias vitivinícolas con 929 ha, representando el 0,4% del total de superficie con vid del país. Dentro de la provincia los viñedos de Cabernet Franc se concentran en el Valle de Uco (45%) y en el departamento de Luján de Cuyo (33%). Cabernet Franc viene creciendo, pasó de ser una variedad utilizada para vinos de corte a vinificarse como varietal de gama media alta, principalmente por su potencialidad para producir vinos con alto valor agregado y a las características distintivas del producto. Las particularidades de la vid y de los vinos dependen del terroir, concepto que en el sentido más simple se refiere a los efectos del material vegetativo (genotipo), combinado con los factores ambientales y con las condiciones del manejo del cultivo. Asimismo, la significación de la calidad integra varios aspectos, pero para la elaboración de vinos tintos, tienen correlación con altos contenidos de compuestos fenólicos. El presente estudio tuvo por objetivo caracterizar los perfiles y concentración de compuestos fenólicos de uvas y vinos cv. Cabernet Franc provenientes de viñedos ubicados en distintas IG del Valle de Uco (Gualtallary, El Cepillo, Altamira) y Luján de Cuyo (Agrelo). En cada IG se cosecharon uvas con una madurez comercial (24Brix) y los vinos se elaboraron por triplicado bajo condiciones estandarizadas en vasijas. Se determinaron los compuestos fenólicos de bayas y vinos por cromatografía líquida con detector de arreglo de diodos (HPLC-DAD).Los resultados revelan que las muestras de distintas IG tienen una composición química diferente, y que muchos compuestos se correlacionan con variables como la altitud en la que se ubican los viñedos. La concentración de antocianos y de polifenoles totales aumenta con la altura. Existen similitudes con respecto a la composición polifenólica entre las IG El Cepillo y Altamira, ya que se encuentran cercanas entre sí, mientras que las diferencias son mayores si comparamos las IG Agrelo con Gualtallary.Fil: Muñoz, Flavio Andres. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto de Biología Agrícola de Mendoza. Universidad Nacional de Cuyo. Facultad de Ciencias Agrarias. Instituto de Biología Agrícola de Mendoza; ArgentinaFil: Rasse, Manuel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto de Biología Agrícola de Mendoza. Universidad Nacional de Cuyo. Facultad de Ciencias Agrarias. Instituto de Biología Agrícola de Mendoza; ArgentinaFil: Fontana, Ariel Ramón. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto de Biología Agrícola de Mendoza. Universidad Nacional de Cuyo. Facultad de Ciencias Agrarias. Instituto de Biología Agrícola de Mendoza; ArgentinaFil: Urvieta, Roy Alexander. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto de Biología Agrícola de Mendoza. Universidad Nacional de Cuyo. Facultad de Ciencias Agrarias. Instituto de Biología Agrícola de Mendoza; ArgentinaFil: Buscema, Fernando. No especifíca;Fil: Berli, Federico Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto de Biología Agrícola de Mendoza. Universidad Nacional de Cuyo. Facultad de Ciencias Agrarias. Instituto de Biología Agrícola de Mendoza; ArgentinaXXVII Jornadas de Jovens PesquisadoresSão CarlosBrasilAsociación Universidades Grupo MontevideanoUniversidade Federal de São Carlo
Things come in threes: A new complex allele and a novel deletion within the CFTR gene complicate an accurate diagnosis of cystic fibrosis
Background: Despite consolidated guidelines, the clinical diagnosis and prognosis of cystic fibrosis (CF) is still challenging mainly because of the extensive phenotypic heterogeneity and the high number of CFTR variants, including their combinations as complex alleles. Results: We report a family with a complicated syndromic phenotype, which led to the suspicion not only of CF, but of a dominantly inherited skeletal dysplasia (SD). Whereas the molecular basis of the SD was not clarified, segregation analysis was central to make a correct molecular diagnosis of CF, as it allowed to identify three CFTR variants encompassing two known maternal mutations and a novel paternal microdeletion. Conclusion: This case well illustrates possible pitfalls in the clinical and molecular diagnosis of CF; presence of complex phenotypes deflecting clinicians from appropriate CF recognition, and/or identification of two mutations assumed to be in trans but with an unconfirmed status, which underline the importance of an in-depth molecular CFTR analysis
Superluminal Localized Solutions to Maxwell Equations propagating along a waveguide: The finite-energy case
In a previous paper of ours [Phys. Rev. E64 (2001) 066603, e-print
physics/0001039] we have shown localized (non-evanescent) solutions to Maxwell
equations to exist, which propagate without distortion with Superluminal speed
along normal-sized waveguides, and consist in trains of "X-shaped" beams. Those
solutions possessed therefore infinite energy. In this note we show how to
obtain, by contrast, finite-energy solutions, with the same localization and
Superluminality properties. [PACS nos.: 41.20.Jb; 03.50.De; 03.30.+p; 84.40.Az;
42.82.Et. Keywords: Wave-guides; Localized solutions to Maxwell equations;
Superluminal waves; Bessel beams; Limited-dispersion beams; Finite-energy
waves; Electromagnetic wavelets; X-shaped waves; Evanescent waves;
Electromagnetism; Microwaves; Optics; Special relativity; Localized acoustic
waves; Seismic waves; Mechanical waves; Elastic waves; Guided gravitational
waves.]Comment: plain LaTeX file (12 pages), plus 10 figure
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