103,219 research outputs found
No álbum do Sr. F. G. Braga
No full textTexto do poema "No álbum do Sr. F. G. Braga", de Machado de Assis, editado por José Américo Miranda e Alex Sander Luiz Campos. 
No álbum do Sr. F. G. Braga
No full textTexto do poema "No álbum do Sr. F. G. Braga", de Machado de Assis, editado por José Américo Miranda e Alex Sander Luiz Campos.  
Measurements of pCO2 and turbulence from an autonomous drifting buoy in 2019 during FALKOR cruise FK191120
No full textData from autonomous, drifting buoy with a floating chamber to measure insitu air-sea carbon dioxide (CO2) fluxes during RV Falkor cruise FK191120 in the southern Pacific during November-December 2019. The technique is described in detail in Ribas-Ribas et al. (2018) (https://doi.org/10.1525/elementa.275). The buoy is equipped with a sensor to measure aqueous and atmospheric partial pressure of CO2 (pCO2), and to monitor the increase or loss of CO2 inside the chamber. One complete cycle including two chamber measurements last 70 minutes. The buoy can be deployed for more than 15 hours, and at wind speeds of up to 10 m/s. Floating chambers are known to overestimate fluxes due to the creation of additional turbulence at the water surface. We check that by measuring turbulence with two Acoustic Doppler Velocimeter (ADV), one directly underneath the center of the floating chamber (equipped with an inertial motion unit) and the other one positioned sideways to measure turbulence outside the perimeter of the buoy
Stellar Occultations by Large TNOs on 2012: The February 3rd by (208996) 2003 AZ84, and the February 17th by (50000) Quaoar
No full textOn February 2012, two stellar occultation's by large Trans-neptunian Objects (TNO's) were observed by our group. On the 3rd, an event by (208996) 2003 AZ84 was recorded from Mont Abu Observatory and IUCAA Girawali Observatory in India and from Weizmann Observatory in Israel. On the 17th, a stellar occultation by (50000) Quaoar was observed from south France and Switzerland. Both occultations are the second observed by our group for each object, and will be used to improve the results obtained on the previous events. The occultation by 2003 AZ84 is the first multi-chord event recorded for this object. From the single chord event on January 8th 2011, Braga-Ribas et al. 2011 obtained a lower limit of 573 +/- 21 km. From the 2012 occultation the longest chord has a size of 662 +/- 50 km. The other chords will permit to determine the size and shape of the TNO, and derive other physical parameters, such as the geometric albedo. The Quaoar occultation was observed from south of France (Observatoire de la Côte d'Azur, TAROT telescope and Valensole) and from Gnosca, Switzerland. Unfortunately, all three sites in France are almost at the same Quaoar's latitude, so in practice, we have two chords that can be used to fit Quaoar's limb. The resulting fit will be compared with the results obtained by Braga-Ribas et al. 2011. Braga-Ribas F., Sicardy B., et al. 2011, EPSC-DPS2011, 1060.Ribas F., Sicardy B., et al. 2011, EPSC-DPS2011, 1060
Energia, forma e significato: rappresentazione e comunicazione linguistica nell'opera di Giorgio Braga
No full textTra le funzioni della comunicazione quella mediatrice è la principale, in particolare modo per la comunicazione linguistica. Lo studioso suppone che analizzando tale funzione si possa arrivare alla scoperta delle caratteristiche fondamentali del meccanismo che collega i paradigmi e i sintagmi. La semantica vista come "operare dei segni" è quindi lo studio del processo semiotico assicurato dalla funzione mediatrice e serve in modo specifico a mediare gli spazi vitali e il campo sociale. Braga è interessato solo indirettamente ai vincoli che sorgono dal costituirsi in sistemi di segni. L'inserimento della comunicazione all'interno del sistema delle azioni, ha portato Braga a individuare che cosa distingue la comunicazione da tutte le altre azioni che non rientrano nella categoria delle comunicazioni.
Ogni uomo ha una diretta esperienza del processo del significare e degli altri processi collegati ai segni. Braga sottolinea spesso che solo l'introspezione offre una conoscenza, adeguata dei processi sociali, mediante le conoscenze parallele fornite dalla stessa procedura introspettiva, ma vi concorrono anche le osservazioni intersoggettive, convergenti su di uno stesso soggetto. La psicologia dell'età evolutiva ha rilevato la complessità dei processi attraverso cui il bambino impara a separare l'oggettivo dal soggettivo
Utilizzando la teoria del campo, Braga ha proposto al di fuori della prospettiva semiologica e linguistica un "rapporto di significanza". La strutturazione dello spazio vitale è un processo psicologico mentre la ricostruzione simbolica del campo sociale è un processo sociologico
Schlag-Rey (M.), Ribas (F.), Chaperon du Larret (L.) - Communications dans la mine et sécurité.
No full textMeynaud Jean. Schlag-Rey (M.), Ribas (F.), Chaperon du Larret (L.) - Communications dans la mine et sécurité.. In: Revue économique, volume 14, n°2, 1963. p. 313
Measurements of turbulence from an autonomous drifting buoy in 2019 during FALKOR cruise FK191120
No full textData from autonomous, drifting buoy with a floating chamber to measure insitu air-sea carbon dioxide (CO2) fluxes during RV Falkor cruise FK191120 in the southern Pacific during November-December 2019. The technique is described in detail in Ribas-Ribas et al. (2018) (https://doi.org/10.1525/elementa.275). The buoy is equipped with a sensor to measure aqueous and atmospheric partial pressure of CO2 (pCO2), and to monitor the increase or loss of CO2 inside the chamber. One complete cycle including two chamber measurements last 70 minutes. The buoy can be deployed for more than 15 hours, and at wind speeds of up to 10 m/s. Floating chambers are known to overestimate fluxes due to the creation of additional turbulence at the water surface. We check that by measuring turbulence with two Acoustic Doppler Velocimeter (ADV), one directly underneath the center of the floating chamber (equipped with an inertial motion unit) and the other one positioned sideways to measure turbulence outside the perimeter of the buoy
Measurements of pCO2 from an autonomous drifting buoy in 2019 during FALKOR cruise FK191120, station 2
No full textData from autonomous, drifting buoy with a floating chamber to measure insitu air-sea carbon dioxide (CO2) fluxes during RV Falkor cruise FK191120 in the southern Pacific during November-December 2019. The technique is described in detail in Ribas-Ribas et al. (2018) (https://doi.org/10.1525/elementa.275). The buoy is equipped with a sensor to measure aqueous and atmospheric partial pressure of CO2 (pCO2), and to monitor the increase or loss of CO2 inside the chamber. One complete cycle including two chamber measurements last 70 minutes. The buoy can be deployed for more than 15 hours, and at wind speeds of up to 10 m/s. Floating chambers are known to overestimate fluxes due to the creation of additional turbulence at the water surface. We check that by measuring turbulence with two Acoustic Doppler Velocimeter (ADV), one directly underneath the center of the floating chamber (equipped with an inertial motion unit) and the other one positioned sideways to measure turbulence outside the perimeter of the buoy
New Φ method in EN1996 for the verification of second-order effects in load-bearing masonry walls
No full textThe Eurocode 6 (EC6) revision work carried out in recent years within the “CEN/TC 250/SC 6 – Masonry Structure” was an opportunity to reconsider verification methods for unreinforced masonry (URM) walls when subjected to combined vertical and out-of-plane loading and with significant second-order effects. The method proposed in the previous version of EC6 was based on an axial load capacity reduction factor (φm), the values of which were derived from an approximate model, fairly conservative for a wide range of wall stiffnesses. In addition, the previous version of EC6 did not require explicit verification in terms of lateral flexural capacity for URM walls subjected to significant lateral loads (e.g., seismic actions), when it would be appropriate and rational. For the latter verification, which should also take into account second-order effects, a reduction factor similar to φm can be defined for bending capacity reduction (φM). Therefore, this paper aims to show the scientific derivation of the new criteria adopted in the current version of EC6 (EN1996-1-1:2022) for the verification of second-order effects in URM walls. In particular, the numerical procedure for quantifying the φ factors is presented, which has improved the estimates previously available in the literature. Based on these numerical results, prediction models of these φ factors are proposed, which are also used to demonstrate the one-to-one correspondence between φm and φM. Then, validation comparisons are shown between the predicted values of the reduction factors and the relevant experimental and numerical values previously available in the literature. Finally, the calibration of the models proposed in the new version of EC6 is shown for both φm and φM
Seismic risk assessment using machine learning for the automatic identification of building features
No full textIn nations with a high seismic hazard and a significantly vulnerable built heritage, seismic risk assessment represents a serious challenge. In particular, when seismic risk needs to be analyzed on large scales, vulnerability and exposure evaluations can lead to time-consuming and expensive investigations. In this work, artificial intelligence techniques are leveraged to address this issue. Specifically, Convolutional Neural Networks (CNNs) are trained to automatically collect data about buildings from satellite imagery and street views. In this work, three CNNs are trained to recognize the following features: building height, material, and construction period, deemed to be the essential parameters for associating a specific seismic vulnerability level to a building. The following step of this study involves the combination of vulnerability and exposure with seismic hazard to evaluate seismic damage and risk. The latter is represented by potential losses in terms of reconstruction costs, number of unusable buildings, and displaced people. Emergency management organizations may find the results of this work useful for setting priority standards for seismic retrofit operations, as well as for allocating rescue resources after an earthquake
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