Cycles Formation
Mostrando 1-12 de 254 artigos, teses e dissertações.
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1. PHOTODEGRADATION OF RhB UNDER VISIBLE LIGHT BY PT/TIO2 NANOPARTICLES PREPARED THROUGH PHOTOREDUCTIVE DEPOSITION PROCESS
Pt/TiO2 nanoparticles were prepared by a simple two-step aqueous solution method, which consists of a low temperature hydrothermal step and a photoreduction deposition step. The as-prepared samples were characterized by XRD, TEM, XPS, UV-vis, and BET techniques. The as-prepared samples exhibited enhanced photocatalytic activity towards the degradation of rho
Quím. Nova. Publicado em: 2021-03
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2. SYNTHESIS, CHARACTERIZATION, ADSORPTION AND THERMODYNAMIC STUDIES OF PURE AND BINARY CO2-N2 MIXTURES ON OXYGEN ENRICHED NANOSTRUCTURED CARBON ADSORBENTS
Abstract Oxygen enriched porous carbons have been synthesized by a nanocasting technique using mesoporous zeolite as template and epoxy resin as precursor. Characterization results show the effect of the nanocasting technique on the development of heterogeneous surface, high basicity, and high surface area of 686.37 m2g-1, beneficial for CO2 adsorption. Pure
Braz. J. Chem. Eng.. Publicado em: 09/12/2019
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3. International VaR approach: Backtesting for different capital markets
RESUMO O objetivo deste artigo é comparar diferentes métricas de valor em risco (VaR), distinguindo-se de estudos anteriores na medida em que compara três categorias de ativos pertencentes a sete países. Desde a concepção do VaR, foram desenvolvidas várias abordagens para melhorar a precisão da estimativa de perdas. Entretanto, praticamente inexiste
Rev. contab. finanç.. Publicado em: 09/12/2019
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4. The use of a liner under different bulk-fill resin composites: 3D GAP formation analysis by x-ray microcomputed tomography
Abstract Gap formation of composite resin restorations is a serious shortcoming in clinical practice. Polymerization shrinkage stress exceeds the tooth-restoration bond strength, and it causes bacterial infiltration within gaps between cavity walls and the restorative material. Thus, an intermediate liner application with a low elastic modulus has been advis
J. Appl. Oral Sci.. Publicado em: 25/11/2019
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5. Influence of doping with Sm3+ on photocatalytic reuse of ZnO thin films obtained by spin coating
ABSTRACT The difficulty in the powder reuse favors the study of materials in the form of thin films. ZnO based films have high photocatalytic potential. In this work, ZnO:xSm3+ (x = 0, 1, 2 and 4 %mol) thin films were prepared by spin coating method. The resins obtained to manufacture the thin films were prepared by complex polymerization method. The samples
Matéria (Rio J.). Publicado em: 25/11/2019
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6. Study of obtaining thin films of CeO2 doped with 2 and 4 mol% of europium, terbium and thulium by spin coating: photocatalytic properties
Resumo Neste estudo, filmes finos de CeO2 dopados com Eu3+, Tb3+ e Tm3+ nas proporções de 2 e 4 %mol foram obtidos por spin coating e calcinados em 700 °C. Os filmes foram caracterizados pelas técnicas de DRX, MEV, MFA e UV-vis. As propriedades fotocatalíticas dos filmes finos foram determinadas pela degradação do corante azul de metileno (AM). Os fil
Cerâmica. Publicado em: 14/11/2019
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7. Aspectos da Formação Econômica de Mato Grosso do Sul
Resumo O objetivo deste artigo é analisar aspectos da formação econômica de Mato Grosso do Sul (MS). Em termos teóricos, admite-se que o desenvolvimento do estado de MS é historicamente dependente dos ciclos externos (nacionais e internacionais) e que, por isso, a sua trajetória de desenvolvimento tem traços marcantes de uma inserção periférica. P
Estud. Econ.. Publicado em: 10/10/2019
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8. Development and selection of super-sweet corn genotypes (sh2) through multivariate approaches
ABSTRACT The aim of the present study was to investigate relations among ten traits in super-sweet corn genotypes assessed by means of simple correlation, path and canonical variable analyses, as well as to investigate the relative importance of such traits to the super-sweet corn breeding program developed at Darcy Ribeiro Northern Fluminense State Universi
Bragantia. Publicado em: 25/10/2018
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9. Active compounds and derivatives of camellia sinensis responding to erosive attacks on dentin
Abstract This research explored the potential of Camellia sinensis-derived teas and active compounds to be used as treatments to prevent dentin wear. Human root dentin slabs were randomly assigned to 5 groups (n = 10) as follows: distilled water (DW, control), epigallocatechin-3-gallate (EGCG), theaflavin gallate derivatives (TF), commercial green tea (GT),
Braz. oral res.. Publicado em: 24/05/2018
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10. BIOGENIC SYNTHESIS OF IMPORTANT ENVIRONMENTAL MINERALS: MAGNESIUM PHOSPHATE COMPOUNDS AND PERSPECTIVES
The ecological processes in which metabolites with industrial or medical applications are produced are of great importance. Magnesium plays many important roles in environmental and medical applications. Phosphorus is obtained by mining. It is estimated to have a very limited half-life and expected to be depleted as a resource in 100 years. Its recovery by m
Quím. Nova. Publicado em: 2018-05
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11. Kinetics Oxidation and Characterization of Cyclically Oxidized Layers at High Temperatures for FeMnSiCrNiCe and FeSiCrNi Alloys
Conventional stainless steels are used in cyclic oxidation, but the high amount of Cr and mainly Ni increase the price of these alloys. The objective of the present study was to assess the cyclic oxidation resistance of FeSiCrNi and FeMnSiCrNiCe alloys in comparison to AISI 304 and AISI 310 stainless steels by evaluating the oxidation kinetics and using char
Mat. Res.. Publicado em: 18/09/2017
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12. Investigation of Electrocatalysts for Selective Reduction of CO2 to CO: Monitoring the Reaction Products by on line Mass Spectrometry and Gas Chromatography
The carbon dioxide electrocatalytic reduction is central for the development of regenerative cycles of electrochemical energy conversion and storage. Herein, the gaseous products of the CO2 electroreduction were monitored by using an electrochemical cell on line coupled to a differential electrochemical mass spectrometer (DEMS), aiming at searching for elect
J. Braz. Chem. Soc.. Publicado em: 2017-09