Nucleation Processes
Mostrando 1-12 de 67 artigos, teses e dissertações.
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1. Ediacaran emerald mineralization in Northeastern Brazil: the case of the Fazenda Bonfim Deposit
Abstract The Fazenda Bonfim emerald deposit lies within the Seridó Belt. It is a classic example of deposit formed through metasomatic interactions between Be-rich granite intrusions and Cr(± V)-rich mafic-ultramafic rocks. The setting of the emerald mineralization was built under strong strike-slip dynamics, which produced serpentinization and talcificati
Braz. J. Geol.. Publicado em: 13/01/2020
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2. Restauração passiva em pastagens abandonadas a partir de núcleos de vegetação na Mata Atlântica, Brasil
Resumo Os núcleos de vegetação são estruturas formadas espontaneamente por pequenos agrupamentos de indivíduos arbustivos e arbóreos, que, ao evoluírem em pastagens perturbadas, podem contribuir na sucessão ecológica. Para compreender a evolução dos processos de restauração florestal passiva em ecossistemas tropicais, depois de paralisada a pecu
Ciênc. Florest.. Publicado em: 02/12/2019
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3. Fatigue failure analysis of HSLA steel sheets holed by conventional and flow drilling processes
RESUMO O processo de furação por escoamento produz buchas para uniões removíveis que podem ser roscadas pelo processo de rosqueamento por conformação, reduzindo etapas da produção de componentes da indústria automobilística e em galpões da construção civil. Aços de alta resistência e baixa liga (ARBL) são empregados em variadas aplicações n
Matéria (Rio J.). Publicado em: 16/09/2019
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4. Fatigue failure analysis of HSLA steel sheets holed by conventional and flow drilling processes
ABSTRACT Flow drilling process produces bushes for removable joints that can be threaded by forming tapping process, reducing stages in production of components of automobile industry and in construction sheds. High strength and low alloy steels (HSLA) are employed on several applications in the processing industry. Benefits provided by these materials make
Matéria (Rio J.). Publicado em: 10/06/2019
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5. Caracterización de compositos biocerámicos en esponjas de titanio mediante interpenetración por corriente pulsada asistida
ABSTRACT Recently, it has been directing some special attention to the development of new manufacturing processes, with engineering applications in human tissues [1]. 3D printing applied to tissue engineering requires pulse computational techniques such as stereolithographic modeling, and special manufacturing processes, to name a few; Laser Sintering or Ext
Matéria (Rio J.). Publicado em: 19/07/2018
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6. Comportamiento reológico del aluminio AA6061 por efecto de las transformaciones de fase activadas térmicamente
ABSTRACT Aluminum alloys at room temperature not experience significant rheological behavior due to its coherent microstructural order, and its high compactness. However, the increase of the temperature generates stress fields, and thereby deformations, that alter the microstructural equilibrium, manifesting the rheological behavior as consequence of the int
Matéria (Rio J.). Publicado em: 22/06/2017
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7. MODELING PARTICLE SIZE DISTRIBUTION IN HETEROGENEOUS POLYMERIZATION SYSTEMS USING MULTIMODAL LOGNORMAL FUNCTION
Abstract This work evaluates the usage of the multimodal lognormal function to describe Particle Size Distributions (PSD) of emulsion and suspension polymerization processes, including continuous reactions with particle re-nucleation leading to complex multimodal PSDs. A global optimization algorithm, namely Particle Swarm Optimization (PSO), was used for pa
Braz. J. Chem. Eng.. Publicado em: 2016-09
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8. EVALUATION OF SODIUM CHLORIDE CRYSTALLIZATION IN MEMBRANE DISTILLATION CRYSTALLIZATION APPLIED TO WATER DESALINATION
Abstract Crystallization in a Direct Contact Membrane Distillation (DCMD) process was studied both theoretically and experimentally. A mathematical model was proposed in order to predict the transmembrane flux in DCMD. The model fitted well experimental data for the system NaCl-H2O from undersaturated to supersaturated conditions in a specially designed crys
Braz. J. Chem. Eng.. Publicado em: 2016-09
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9. EFEITO DA ESTRUTURA MOLECULAR DE LIGANTES DE SUPERFÍCIE EM PONTOS QUÂNTICOS DE CdTe DISPERSOS EM ÁGUA
Water-soluble CdTe quantum dots are synthesized to investigate how short-chain surface ligands bearing -SH, -COOH, and -NH2 groups interact with CdTe during nucleation/growth processes. Their optical properties and colloidal stability after the ligand exchange are also investigated. We then characterize the resulting CdTe by fluorescence, UV–Vis absorption
Quím. Nova. Publicado em: 2015-01
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10. Nucleation and growth process of sodalite and cancrinite from kaolinite-rich clay under low-temperature hydrothermal conditions
The synthesis of low-silica zeotypes by hydrothermal transformation of kaolinite-rich clay and the nucleation and growth processes of sodalite and cancrinite in the system Na2O-Al2O3-SiO2-H2O at 100 °C were investigated. The synthesis products were characterized by X-ray powder diffraction (XRPD), scanning electron microscopy (SEM), Fourier transform infr
Mat. Res.. Publicado em: 01/02/2013
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11. Crystallization of II-VI semiconductor compounds forming long microcrystalline linear assemblies
In this work we report the formation of long microcrystalline linear self-assemblies observed during the thin film growth of several II-VI compounds. Polycrystalline CdTe, CdS, CdCO3, and nanocrystalline CdTe:Al thin films were prepared on glass substrates by different deposition techniques. In order to observe these crystalline formations in the polycrystal
Mat. Res.. Publicado em: 01/02/2013
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12. Kinetical study about the cobalt electrodeposition onto polycrystalline platinum
An electrochemical study of Co electrodeposition onto polycrystalline Pt from an aqueous solution containing 10-2 M CoCl2 + 1 M NH4CI (pH = 9.3) was conducted at overpotential conditions. The current density transients showed two maxima that corresponded to two nucleation and growth processes. The entire transient behavior was adequately predicted considerin
Quím. Nova. Publicado em: 2013