Rifting evolution and paleogeography of the Brazilian Equatorial Atlantic Margin: From Triassic to Holocene [Evolução do rifteamento e paleogeografia da margem Atlântica Equatorial do Brasil: Triássico ao Holoceno]
Soares Junior A.V.,Federal University of São Paulo |
Hasui Y.,Paulista University |
Costa J.B.S.,Institute Estudos Superiores da Amazonia |
Machado F.B.,Federal University of São Paulo
Geociencias | Year: 2011
The Equatorial Atlantic Margin evolved from three rift systems recorded by a complex set of sedimentary basins developed since Upper Triassic to the Lower Cretaceous (Albian). The first rift system formed Foz do Amazonas Basin in Upper Triassic; the second phase formed Marajó Basin in Berriasian, a new rift in Foz do Amazonas Basin in Valanginian and Bragança-Viseu, Ilha Nova, São Luís e Barreirinhas basins in Aptian; the third phase formed Barreirinhas and Pará- Maranhão basins and a new rifting in the Foz do Amazonas Basin between the Aptian and Albian and evolved to continental break up. The main paleostress field during rift evolution was NE-SW and after the continental break up took the E-W direction, from the development of transform zones in the oceanic crust. From Miocene, South America was subjected to intraplate tectonics, which resulted in formation of E-W transcurrent faults that generated transtensive and transpressive segments that formed sedimentary basins and hills, resulting in changes in the drainage network. In Quaternary the landscape was modified by the last ice age that changed the sea level; the coastal drainage network was drowning resulting in the formation of the current line coast.
Study of geometric and economic characteristcs of overlay welds for processes MIG and MIG-CW [Estudo das características geométricas e econômicas das soldas de revestimento para os processos MIG e MIG-CW]
Garcia D.N.,Federal University of Pará |
Da Mota C.A.M.,Federal University of Pará |
Mendes C.P.N.,Federal University of Pará |
Assuncao P.D.,Institute Estudos Superiores da Amazonia |
And 2 more authors.
65th ABM International Congress, 18th IFHTSE Congress and 1st TMS/ABM International Materials Congress 2010 | Year: 2010
This paper aims to compare the geometric and economic characteristics for MIG and MIG-CW processes, aiming to analyze the productivity gain with the addition of cold wire. The welding of stainless steel were deposited by the MIG and MIG with addition of cold wire, MIG-CW, processes in the flat position and drawing direction of welding, automated. The base metal used was 1020 steel in plates with a thickness of 6.3 mm. The protection gas used was Ar-2%O 2 at 15 L/min. After performed the welding, the samples were selected and properly prepared by sanding and were attacked for macrographs analysis, for the measuring of penetration and reinforcement values were used an aid of software for the calculation of dilution. The results showed an increase in the amount of mass deposited in function of the time for the MIG-CW without affecting the surface quality of the weld, and reduced penetration which is good for overlaying welds in dissimilar materials, because it will decrease the dilution.
Agroforestry systems in Eastern Amazonia: The case of smallholders of Santa Maria do Pará, Brazil [Sistemas Agroflorestais na Amazônia Oriental: O caso dos agricultores familiares de Santa Maria do Pará, Brasil]
Raiol C.S.,Institute Estudos Superiores da Amazonia |
Dos Rosa L.S.,University of Amazon
Revista Brasileirade Ciencias Agrarias | Year: 2013
The research aimed to identify and evaluate the commercial multistrata Agroforestry Systems (AFSs) established in Santa Maria do Pará, with an emphasis on floristic composition, the nature of the components, the management, the preferred species for farmers and the main barriers related to the adoption of the AFSs. Data were collected with the aid of structured interviews, direct observation and agricultural calendar, and were analyzed using descriptive statistics and Pearson's correlation. The floristic composition of AFSs was studied by the diversity index of Shannon-Wiener. The AFSs showed low floristic diversity and consist primarily of fruit species and agricultural short cycle, for marketing and consumption, emphasizing the species Cocos nucifera L., Piper nigrum L., Anacardium occidentale L., Theobroma grandiflorum Willd. and Maninhot esculenta Crantz. The AFSs are managed, generally, with low technological level. The species of interest of farmers are Maninhot esculenta, Passiflora edulis Sims . Anacardium occidentale, Theobroma grandiflorum Willd. and Piper nigrum L.
Barbosa A.L.N.,Institute Estudos Superiores da Amazonia |
Vieira L.P.O.,Institute Estudos Superiores da Amazonia |
de Oliveira Y.J.,Institute Estudos Superiores da Amazonia |
de Loureiro J.P.B.,Federal Rural University of Amazonia |
Borges F.Q.,University of Amazon
Custos e Agronegocio | Year: 2015
The producers of the municipality of Thailand, in Pará, can operate the production of palm oil through autonomous systems and integrated systems to agribusiness. This study aims to comparatively analyze these forms of production economically in order to verify the preferred option for the development of this crop in Thailand, Pará The methodology used in this research, in part economic viability indicators NPV (Present Value net), IRR (Internal Rate of Return) and IBC (Benefit Cost Ratio), calculated from cash flows in production scenarios in autonomous systems and integrated. On the strategic fron, applied the SWOT. The study concluded that the return on investment in autonomous production is faster than the integrated production. The autonomous production reaches submit a return of R$ 8.33 for every $ 1.00 invested in R activity while integrated production has at most 5.22. The IRR shows that autonomous production has returned 13.41 %, while the integrated production returns to the initial investment 11.47 % over the life of the activity. © 2015, Universidade Federal Rural de Pernambuco. All rights reserved.