Modal Zone
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Tri-modal Microstructure in Different Loading Zones Under TA15 Ti-alloy Isothermal Local Conventional Forging and Given Subsequent Heat Treatment
For TA15 Ti-alloy large-scale component, isothermal local conventional forging (ILCF) combined with subsequent heat treatment provides a feasible approach to obtain a tri-modal microstructure with attractive comprehensive performance. However the tri-modal microstructure characteristics and evolution laws in the first and second loading zones are lack of und
Mat. Res.. Publicado em: 10/06/2019
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2. The Cristalino IOCG deposit: an example of multi-stage events of hydrothermal alteration and copper mineralization
Abstract The Cristalino deposit is located 40 km east of Sossego mine, Carajás. The orebody lies along a NW-SE-striking shear zone and is mainly hosted by the Neoarchean bi-modal volcanics of the Grão Pará Group. Field work and petrographic data seconded by SEM-EDS analysis allowed recognizing an early sodic metasomatism that was followed by calcic-ferric
Braz. J. Geol.. Publicado em: 15/04/2019
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3. Short-term Creep Properties and Fracture Surface of 18 Ni (300) Maraging Steel Plasma Nitrided
Plasma nitriding of a solution annealed and aged 300 grade maraging steel was studied aiming to increase the creep resistance. The surface microhardness reached 1,140 HV, producing 50 µm layer composed of ε-Fe3N and γ'-Fe4N nitrides at the uppermost sample layer. The inner core remained unaltered presenting typical plate-like martensite microstructure of
Mat. Res.. Publicado em: 13/03/2017
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4. Mineralogia e petrologia de xenólitos mantélicos das regiões de Ubatuba (SP) e Monte Carmelo (MG): evidências de fusão parcial e metassomatismo no manto superior do sudeste do Brasil / Mineralogy and petrology of mantle xenoliths from Ubatuba (SP) and Monte Carmelo (MG): melting and metasomatism evidences in the upper mantle from southeast Brazil
Mineralogical and petrological studies were conducted in mantle xenoliths included in a kaersutite lamprophyre dyke from Ubatuba (SP) (Serra do Mar Igneous Province), and in the Limeira 1 Kimberlite (Monte Carmelo, MG; Alto Paranaíba Alkalic Province), using petrography and major and trace element geochemistry in minerals by electron microprobe and LA-ICPMS
Publicado em: 2009
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5. Region, regionalização and net politics: a study of the association of the cities of Araguai-Tocantins (AMAT) / Região, regionalização e rede política: um estudo o da associação dos municípios do Araguai-Tocantins (AMAT)
A discussão sobre região pretende dar subsídios para compreender as dinâmicas territoriais no Brasil e suas implicações a nível regional tendo como seu principal agente de uma nova proposta de regionalização para o Pará a Associação dos Municípios do Araguaia-Tocantins (AMAT). Cuja implicação resulta em novas formas de conceber a região e sua
Publicado em: 2006
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6. Analise dinamica, numerica e experimental de uma viga trincada / Experimental and numeric dynamic analysis of cracked beam
This investigation describes a beam finite element with crack in central region, for the numerical analysis of the dynamic behavior for any crack length. The element simulates the dynamic behavior of a rectangular section beam with three degree of freedom per node and includes the shear effects and plastic zone at crack tip. The model was implemented in MATL
Publicado em: 2005
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7. Evaluation of cutting forces and prediction of chatter vibrations in milling
The prediction of chatter vibrations between the cutter and workpiece is important as a guidance to the machine tool user for an optimal selection of depth of cut and spindle rotation, resulting in maximum chip removal rate without this undesirable vibration. This can be done by some approaches. In this work, an analytical method is applied in which the time
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2004-03
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8. SANDY BEACH MORPHODYNAMICS AND MACROBENTHIC COMMUNITIES IN TEMPERATE, SUBTROPICAL AND TROPICAL REGIONS - A MACROECOLOGICAL APPROACH
A comprehensive study involving 52 microtidal beaches spanning from reflective to dissipative states and located in tropical, subtropical and temperate regions in the Atlantic, Pacific and Indian oceans was carried out to unravel the relative roles of latitude and beach morphodynamics in determining beach macrobenthic species richness, abundance, biomass and
Publicado em: 2003
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9. Petrogenese das intrusões graniticas compostas de Teofilandia e Barrocas, Greenstone Belt do Rio Itapicuru, Bahia, Brasil
The Rio Itapicuru Greenstone Belt (RIGB) is a Paleoproteozoic sequence situated in the northern portion of the São Francisco Craton, Bahia state, Brazil. Overlying a basement consisting of gnaisse and migmatites, this volcanic-sedimentary belt is intruded by several granitoid intrusions of different chemical compositions. Two of the most important intrusive
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/08/2002
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10. Mapping the actin filament with myosin
Structural studies have shown that the heads of the myosin motor molecule bind preferentially to “target zones” of favorably oriented sites on the helices of the actin filament. We present direct evidence for target zones from the interactions of a single myosin head with an actin filament held between two optically trapped beads. With compliant tra
The National Academy of Sciences.
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11. In vitro activities of aztreonam, imipenem, and amoxycillin-clavulanate against ampicillin-resistant Haemophilus influenzae.
Two hundred and fifty-seven ampicillin-resistant clinical isolates of Haemophilus influenzae were tested by disk diffusion and MIC determination for susceptibility to aztreonam, imipenem, and amoxycillin combined with clavulanate. The modal MICs and MICs for 50 and 90% of isolates of all three antimicrobial agents for the 157 beta-lactamase-positive strains