Bubble
Mostrando 1-12 de 329 artigos, teses e dissertações.
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1. Characterization of a complex carbonate-silicate apatite ore and its concentration by a two-stage anionic flotation method
Abstract A carbonate-silicate low weathering phosphate ore from an igneous origin deposit in Southeastern Brazil presents a challenge mainly for apatite flotation from its gangue minerals, calcite and dolomite, plus the presence of phlogopite, diopside, magnetite, richterite, ilmenite, vermiculite, quartz and many other minor impurities. Recently, selectivit
REM - International Engineering Journal. Publicado em: 2022
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2. DETERMINATION OF TOTAL AND BIOACCESSIBLE ELEMENTS IN TEMPORARY ADHESIVE TATTOOS USED BY CHILDREN AND ADULTS
The presence of bioaccessible potentially-toxic elements in five different brands of temporary tattoos (packaged with bubble gums) aimed at children and three product brands used by young and adult audiences were analyzed in accordance with the Brazilian Organization of Technical Standards (ABNT) and International Organization for Standardization (ISO) for t
Química Nova. Publicado em: 2022
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3. Endourology and Benign Prostatic Hyperplasia in COVID-19 Pandemic
ABSTRACT The new disease COVID-19 pandemic has completely modified our lifestyle, changing our personal habits and daily activities and strongly our professional activity. Following World Health Organization (WHO) and health care authorities around the World recommendations, all elective surgeries from benign diagnose procedures must be postponed and imperat
Int. braz j urol.. Publicado em: 2020-07
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4. Effect of calcium concentration on calcite flotation from apatite using carbonic gas
Abstract The flotation process currently considered for apatite concentration from the Santa Quitéria phosphate deposit (Brazil), involves bulk flotation of apatite and calcite with anionic collector at pH=10 followed by calcite flotation at pH=5.5, adjusted with H3PO4. Although this concept is efficient from the point of view of separation between apatite
REM, Int. Eng. J.. Publicado em: 2020-06
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5. GUILHERME, Alexandre Anselmo; MORGAN, W. John. Philosophy, dialogue, and education. Nine Modern European Philosophers [Filosofia, diálogo e educação: nove filósofos europeus modernos]. London: Routledge, 2018. 190 p.
Abstract The flotation process currently considered for apatite concentration from the Santa Quitéria phosphate deposit (Brazil), involves bulk flotation of apatite and calcite with anionic collector at pH=10 followed by calcite flotation at pH=5.5, adjusted with H3PO4. Although this concept is efficient from the point of view of separation between apatite
Bakhtiniana, Rev. Estud. Discurso. Publicado em: 2020-06
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6. NUMERICAL AND EXPERIMENTAL INVESTIGATION OF AIR-WATER SYSTEM TO SIMULATE BUBBLE DYNAMICS IN LIQUID SODIUM POOL
Abstract The dynamics of rising bubbles in a liquid sodium pool plays a significant role in the estimation of the radiological source term during anticipated transients and normal operation of a fast reactor. Sodium is chemically reactive with air and water. Therefore, carrying out experiments using sodium on a reactor scale level requires extra precautions.
Braz. J. Chem. Eng.. Publicado em: 13/01/2020
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7. SIMULATION AND EXPERIMENTAL INVESTIGATION OF POWER CONSUMPTION, GAS DISPERSION AND MASS TRANSFER COEFFICIENT IN A MULTI-PHASE STIRRED BIOREACTOR
Abstract Bio-oxidation leaching of refractory gold concentrate was carried out in a typical gas-liquid-solid three-phase stirred bioreactor. The bacteria, which adhered to solid particle surfaces and spread over the liquid phase, require sufficient oxygen and nutrient of carbon and nitrogen, and then the mass transfer rate should be considered. However, the
Braz. J. Chem. Eng.. Publicado em: 13/01/2020
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8. Differences in Pain Threshold Values of Masseter and Temporalis Muscles Before and After Mastication
Abstract Objective: To analyze the differences in the pain thresholds of the masseter and temporalis muscles before and after chewing at the 5th and 10th minutes. Material and Methods: In this cross-sectional study, the pain thresholds of the muscles in both sides of 43 non-TMD subjects were measured using a digital algometer before and after chewing the b
Pesqui. Bras. Odontopediatria Clín. Integr.. Publicado em: 13/01/2020
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9. Forças no sistema de referência acelerado de um pêndulo: estudo teórico e resultados experimentais
Resumo Neste trabalho realizamos, inicialmente, uma discussão teórica sobre as forças no sistema de referência acelerado de um pêndulo que oscila livre de resistência. Tal discussão propicia a afirmação de que, se um acelerômetro for fixado no centro de oscilação de um pêndulo, ele deverá registrar um valor variável sobre o eixo orientado radi
Rev. Bras. Ensino Fís.. Publicado em: 25/11/2019
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10. Recessions and a changing theoretical basis of the recoveries: a view from the state-corporation hegemonic stability theory
RESUMO Este artigo analisa as razões das recessões mundiais em 1974-1975, 1980-1982 e 2008-2009 e métodos para melhorar a economia baseando-se em várias teorias da macroeconomia e de acordo com a visão da teoria da estabilidade hegemônica da corporação estatal. Várias razões práticas das três recessões modernas (isto é, os choques do petróleo
Brazil. J. Polit. Econ.. Publicado em: 17/10/2019
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11. CARBON DIOXIDE BIOFIXATION BY Chlorella sp. IN A BUBBLE COLUMN REACTOR AT DIFFERENT FLOW RATES AND CO2 CONCENTRATIONS
Abstract CO2 biofixation of the microalgae Chlorella sp. for different CO2 concentrations and gas flow rates in a bubble column reactor has been investigated in this study. Microalgae were cultivated under different CO2 concentrations (at 1.75% and 9.45% v/v) and gas flow rates (at 30, 50 and 70 ml/min). The maximum specific growth rate of Chlorella sp. was
Braz. J. Chem. Eng.. Publicado em: 30/09/2019
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12. Impact of artificial destratification on water availability of reservoirs in the Brazilian semiarid
Abstract: Field surveys and integral modelling were carried out to study the effect of bubble plumes on the flow hydrodynamics and the time-evolution of water temperature profiles in a shallow lake with maximum depth of about 4 m. Then, model simulations were performed to verify the feasibility of destratification of ten water-supply reservoirs with capaciti
An. Acad. Bras. Ciênc.. Publicado em: 30/09/2019