Onset Precipitation
Mostrando 1-12 de 31 artigos, teses e dissertações.
-
1. Effect of meteorological factors on first episode and recurrence of primary spontaneous pneumothorax
SUMMARY OBJECTIVE: In this study, we evaluated the clinical characteristics and seasonal distribution of patients with primary spontaneous pneumothorax and examined the relationships between meteorological factors and pneumothorax development overall and in terms of first episode and recurrence. METHODS: The hospital records of 168 pneumothorax patients tr
Revista da Associação Médica Brasileira. Publicado em: 2022
-
2. The Stabilization of Asphaltenes in Different Crude Fractions: A Molecular Approach
The conditions of petroleum extraction may allow asphaltenes to precipitate, causing deposition that clogs wells, pipes and equipment, consequently reducing productivity. In this work, the solubility parameters and precipitation onset of polar fractions of heavy crudes from Brazilian fields were estimated using a simplified system of n-heptane/toluene mixtur
J. Braz. Chem. Soc.. Publicado em: 2021-04
-
3. Caracterização dos Diferentes Tipos de El Niño e seus Impactos na América do Sul a Partir de Dados Observados e Modelados
Resumo Estudos recentes têm apontado para a existência de dois tipos de eventos de El Niño (EN): EN do Pacífico oriental ou Canônico (EP, sigla em inglês) e EN do Pacífico Central ou Modoki (CP, sigla em inglês). Neste estudo, foram utilizados dados observados e de três modelos do Coupled Model Intercomparison Project phase 5 (CMIP5) para avaliar o
Rev. bras. meteorol.. Publicado em: 30/05/2019
-
4. Model Molecules for Evaluating Asphaltene Precipitation Onset of Crude Oils
Predicting the compatibility of crude oils from different streams can be done by applying models that use the solubility parameter of the oils. The approximate solubility parameter value of a given crude oil can be calculated by observing the asphaltene precipitation onset caused by titration with n-heptane. For oils whose precipitation onset is not well def
J. Braz. Chem. Soc.. Publicado em: 23/05/2019
-
5. Relative growth and population dynamics of Macrobrachium iheringi (Decapoda, Palaemonidae)
Abstract During the ontogenetic development of crustaceans, the relative growth of some structures may change, especially during the transition from juvenile to adult. This study describes the relative growth of body structures of Macrobrachium iheringi, and provides information on its population dynamics, such as structure, fecundity, and morphological sexu
Pap. Avulsos Zool.. Publicado em: 20/05/2019
-
6. Population biology of Macrobrachium jelskii (Miers, 1877) (Decapoda, Palaemonidae) from an artificial pond in Bahia, Brazil
Abstract The freshwater prawn Macrobrachium jelskii (Miers, 1877) is widely distributed in South America’s lentic and lotic habitats. We studied the population structure and reproductive biology of the species in the municipality of Cruz das Almas, state of Bahia, Brazil, to supply information on this ecologically and economically relevant species. Samples
Nauplius. Publicado em: 04/09/2017
-
7. COMPARISON BETWEEN ASPHALTENES (SUB)FRACTIONS EXTRACTED FROM TWO DIFFERENT ASPHALTIC RESIDUES: CHEMICAL CHARACTERIZATION AND PHASE BEHAVIOR
Asphaltenes are blamed for various problems in the petroleum industry, especially formation of solid deposits and stabilization of water-in-oil emulsions. Many studies have been conducted to characterize chemical structures of asphaltenes and assess their phase behavior in crude oil or in model-systems of asphaltenes extracted from oil or asphaltic residues
Quím. Nova. Publicado em: 2016-01
-
8. Rainy Season Features for the Alcântara Launch Center
ABSTRACT: The rainy season features for the Alcântara Launch Center region (2°S-3°S; 44°W-45°W), located at the northern coast of Brazil, were obtained by using the Climate Prediction Center/National Oceanic and Atmospheric Administration daily precipitation data from 1979 to 2012 accumulated to pentads. The rainy season onset (demise) was defined as th
J. Aerosp. Technol. Manag.. Publicado em: 2013-12
-
9. Chemical modification of cobalt ferrite nanoparticles with possible application as asphaltene flocculant agent
Asphaltenes can cause enormous losses in the oil industry, because they are soluble only in aromatic solvents. Therefore, they must be removed from the petroleum before it is refined, using flocculant agents. Aiming to find new materials that can work as flocculant agents to asphaltenes, cobalt ferrite nanoparticles were chemically modified through acid-base
Mat. Res.. Publicado em: 02/04/2013
-
10. HILDEBRAND SOLUBILITY PARAMETERS OF THE OIL AND MIXING OIL-HEPTANE ON THE THRESHOLD OF THE PRECIPITATION EMPLOYEE ASPHALTENES MICROSCOPY OPTICS AND SPECTROSCOPY A NEAR-INFRARED (NIR) / PARÂMETROS DE SOLUBILIDADE DE HILDEBRAND DOS PETRÓLEOS E DA MISTURA PETRÓLEO-HEPTANO NO LIMIAR DA PRECIPITAÇÃO DOS ASFALTENOS EMPREGANDO MICROSCOPIA ÓPTICA E ESPECTROSCOPIA DE INFRAVERMELHO-PRÓXIMO (NIR)
The Hildebrand solubility parameter is used to express the compatibility of petroleum in mixtures, starting from the principle that, independently from the system composition, the asphaltenes always precipitate in a certain solubility parameter, known as the flocculation parameter, which estimated value is 16,35 (MPa)1/2. In this paper, it was tried to exper
Publicado em: 2009
-
11. Avaliação do impacto das condições hídricas do solo no início da estação chuvosa de 2004/2005 / Evaluation of the hydric soil conditions role on the 2004/2005 rainy season onset
Some studies have been showed that the surface heat fluxes are important to the monsoon system around the world. The importance of the soil moisture on seasonal forecasts has also been pointed out. Therefore, the influence of the soil moisture on the early stages of the South America (SA) monsoon system was the aim of this study. Moreover, it is aimed to kno
Publicado em: 2009
-
12. EVALUATION OF MODELS APPLIED TO THE PREDICTION OF THE STABILITY AND COMPATIBILITY OF OILS / AVALIAÇÃO DE MODELOS APLICADOS À PREDIÇÃO DA ESTABILIDADE E COMPATIBILIDADE DE PETRÓLEOS
In this work, among the main models developed and applied for pure crude oils stability prediction and for the compatibility between crude oils/fractions; the Toluene Equivalence (TE) performance, the Heithaus parameter (Parameter P) of the crude compatibility model, the Crude Compatibility Model, the Colloidal Instability Index (CII) and the one of the Bure
Publicado em: 2007