1,355,053 research outputs found
Juventude e controle social: a Operação Verão no Rio de Janeiro através do olhar de agentes de segurança
No full textAs praias do Rio de Janeiro são consideradas um dos espaços mais democráticos da cidade, porque são frequentadas por banhistas de diferentes bairros e camadas sociais. Contudo, a Operação Verão (OV), uma política de segurança realizada nas praias pela Polícia Militar e pela Guarda Municipal, pode limitar esta democracia. A OV tem entre seus objetivos a prevenção dos chamados arrastões, supostamente cometidos por grupos de jovens provenientes dos subúrbios. O propósito deste artigo é analisar a fiscalização à qual está sujeita esta juventude nas praias, através do olhar dos/das agentes de segurança que realizam o policiamento. Para alcançar o objetivo, será apresentado um estudo etnográfico sobre a OV, no qual se divulgam os resultados de entrevistas e observações realizadas junto dos/das agentes nas praias. A análise dos dados demonstrará como a estratégia que visa controlar o espaço público limita e dificulta o acesso à praia para um determinado segmento da população já historicamente criminalizado no Rio de Janeiro: a juventude suburbana.The beaches of Rio de Janeiro are considered to be amongst the city’s most democratic areas, as they are frequented by people who represent a wide range of economic and social classes. Despite this fact, Rio’s Guarda Municipal and the Brazilian Military Police put in place the beach security policy entitled Operação Verão (Operation Summer), which serves to limit this democracy. Amongst the operation’s aims is the prevention of the so-called arrastões, aggressive acts supposedly committed by groups of young people from the suburbs. The purpose of the article is to analyze how these disadvantaged youths were monitored during the beach patrols, as seen through the eyes of the law enforcement officers who implemented this policy. To achieve this goal, an ethnographic study of Operação Verão will be presented, examining the observations of the law enforcement officers’ work on the beaches and the interviews conducted. The analysis of the data shows how this strategy, which aims to control public space, both limits and hinders access to the beach for a certain segment of the population already historically criminalized in Rio de Janeiro: the youth from the suburs.Les plages de Rio de Janeiro sont considérées comme l’un des espaces les plus démocratiques de la ville parce qu’elles sont fréquentées par les baigneurs/baigneuses de différents quartiers et couches sociales. Cependant, l’Operação Verão (Opération Été), une politique de sécurité menée sur les plages par la Police militaire et la Garde municipale, peut limiter cette démocratie. Cette opération a parmi ses objectifs la prévention des dénommés arrastões, vols en bande organisée supposément perpétrés par des jeunes de banlieues. Le but de cet article est d’analyser la surveillance à laquelle ces jeunes sont soumis sur les plages, à travers le regard des agents de sécurité qui effectuent des opérations policières. Pour atteindre cet objectif, une étude ethnographique sur l’Operação Verão sera présentée, à travers de laquelle les résultats des entretiens et des observations effectuées avec les agents sur les plages seront exposés. L’analyse des données montrera comment la stratégie qui vise à contrôler l’espace public limite et gêne l’accès à la plage pour un certain segment de la population déjà historiquement criminalisé à Rio de Janeiro: les jeunes des banlieues
High Temperature Deformation of Friction Stir Processed 7075 Aluminium alloy
No full textThe mechanical and microstructural properties of 7075 aluminium alloy resulting from Friction Stir Processing (FSP), into
sheets of 7 mm thickness, were analysed in the present study. The sheets were processed perpendicularly to the rolling direction;
the tensile mechanical properties were evaluated at room temperature in the transverse and longitudinal directions with respect
to the processing one. Tensile tests were also performed at higher temperatures and different strain rates in the nugget zone, in
order to analyse the superplastic properties of the recrystallized material and to observe the differences from the parent material
as a function of the strong grain refinement due to the Friction Stir Process. The high temperature behaviour of the material was
studied, in the parallel direction, by means of tensile tests in the temperature and strain rate ranges of 150–500 8C and 102–
104 s1 respectively, electron microscopy (FEGSEM) observations were carried out to investigate more closely the fracture
surfaces of the specimens tested at different temperatures and strain rates
Neogene to Quaternary tectonics and mud diapirism in the Gulf of Squillace (Crotone-Spartivento Basin, Calabrian Arc, Italy)
No full textThe Calabrian Arc is an arcuate tectonic feature, formed during the Neogene and Pleistocene, as a consequence of the progressive retreat of the Ionian subduction system. It is a key area for understanding the geodynamic evolution of the Mediterranean Sea. The aim of this paper is to investigate the sedimentary dynamics and the possibly active deformation in the Gulf of Squillace and to highlight their relationships with the fluid escape pathways and mud mobilization. The Squillace embayment is a marine area belonging to the forearc basin of the Calabrian Arc, at the seaward prosecution of the Catanzaro depression. By interpreting public seismic profiles, at different resolutions, calibrated by well logs for hydrocarbon exploration, it was possible to define the structural setting and the Neogene and Quaternary stratigraphic architecture. The geologic setting of the Gulf of Squillace shows the occurrence of normal fault systems cutting through both Neogene and Quaternary deposits. During the Messinian, trans-tensional tectonics led to the formation of a basin whose sediments reached the major thickness in the central portion of the embayment. Since the Early Pliocene extensional tectonics was dominant and the basin depocenter progressively changed its orientation, creating a narrow basin roughly oriented NW-SE. Similar tectonic setting was also present during the Pleistocene extension. A Middle to Late Pliocene contractional event led to development of a thrust zone in the northern Crotone swell. Mud diapirs that occur in the external area of the Gulf of Squillace, are located close to the Pliocene and Pleistocene depocenter. The overpressure provided by the Pliocene and Pleistocene sediment accumulation on Messinian and pre-Messinian sediments and the evolution of normal fault systems, triggered the mud diapirs formation that progressively developed toward the upper slope. Extensional deformation and mud diapirism influence the morphologic evolution of the slope and the basin, resulting in the retrogressive erosion of canyon heads and gravity-driven slope failures
Effect of anisotropy on fatigue properties of 2198 Al–Li plates joined by friction stir welding
No full textAl-Li alloys are characterized by a strong anisotropy in mechanical and microstructural properties with respect to the rolling direction. In the present paper, 4 mm sheets of 2198 Al-Li alloy were joined via friction stir welding (FSW) by employing a rotating speed of 1000 mm/min and a welding speed of 80 mm/min in parallel and orthogonal direction with respect to the rolling one. The joints mechanical properties were evaluated by means of tensile tests at room temperature. In addition, fatigue tests were performed by using a resonant electro-mechanical testing machine under constant amplitude control up to 250 Hz sinusoidal loading. The fatigue tests were conducted in axial control mode with R = σmin/σmax = 0.33, for all the welding and rotating speeds used in the present study
PROPRIETA’ MECCANICHE E MICROSTRUTTURALI DI GIUNTI IN LEGA Al-Li 2198 SALDATI PER FRICTION STIR WELDING
No full textText of Solicitor Opinions and a Presidential Letter Regarding National Monuments and the Antiquities Act of 1906
No full textThese five full-text documents are cited in Mark Squillace, The Monumental Legacy of the Antiquities Act of 1906, 37 Ga. L. Rev. 473 (2003), available at http://scholar.law.colorado.edu/articles/508; and/or Mark Squillace, Eric Biber, Nicholas S. Bryner & Sean B. Hecht, Presidents Lack the Authority to Abolish or Diminish National Monuments, 103 Va. L. Rev. Online 55 (2017), http://www.virginialawreview.org/sites/virginialawreview.org/files/Hecht%20PDF.pdf: U.S. Department of the Interior, Office of the Solicitor, Opinion of Apr. 20, 1915 (cited in Opinion of January 30, 1935, M-27657). U.S. Department of the Interior, Office of the Solicitor, Opinion of June 3, 1924, M-12501, M-12529 (cited in Opinion of January 30, 1935, M-27657). U.S. Department of the Interior, Office of the Solicitor, Opinion of May 16, 1932, M-27025 (cited in Opinion of January 30, 1935, M-27657). U.S. Department of the Interior, Office of the Solicitor, Opinion of Jan. 30, 1935, M-27657. Letter from President Bill Clinton to Secretary of the Interior Bruce Babbitt (Nov. 10, 1998).
“Babbitt\u27s ability to successfully promote protection of areas under the Antiquities Act depended on cooperation from the White House, and President Clinton obligingly sent Babbitt a letter requesting Babbitt\u27s recommendations for areas deemed worthy of national monument status. In accordance with Alaska v. Carter, this insured that Babbitt\u27s recommendations would not be subject to the NEPA process.” – Mark Squillace, The Monumental Legacy of the Antiquities Act of 1906, 37 Ga. L. Rev. 473, 540 (2003)
Laser-Directed Energy Deposition of H13: processing window and improved characterization procedures
No full textAdditive manufacturing has the potential to create, repair, or enhance customized tools, but reliable processing guidelines for tool steels are necessary. This study focuses on printing H13 tool steel on a 316 L substrate using Laser-Directed Energy Deposition technology. A comprehensive study on the most influential process parameters was carried out, i.e. laser power (1400, 1600, 1800, 2000 W), powder feed rate (9, 12, 15 g/min) and scanning speed (1000, 1200 mm/min), for the production of single tracks. Cladding angle, aspect ratio, dilution, shift, microhardness, microstructures were selected as measured output. Manufacturing guidelines were established for a complete characterization of individual tracks, with a new approach for properly calculating the dilution. The tracks exhibited different properties and the influence of process parameters on the measured output was evaluated. The outcomes determine a technological window where it is possible to select the most sensible process parameters depending on the desired applicatio
Effect of welding parameters on mechanical and microstructural properties of dissimilar AA6082-AA2024 joints produced by Friction Stir Welding
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