Wavelength
Mostrando 13-24 de 974 artigos, teses e dissertações.
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13. A Novel Tri-bandpass Filter Side-coupled Square Ring Based
Abstract This work presents the design of a tri-bandpass filter based on the side-coupled square ring structure. The modeling is conceived from the classic approach of coupled transmission lines. The geometry consists of a square structure of electrical length equal to twice the wavelength of the main operating frequency, and the laterally coupled lines thro
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2020-06
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14. An Alternative Spectrophotometric Determination of Carbaryl Insecticide Residues in Water Samples Using the Cerium-Catalyzed Belousov-Zhabotinsky Oscillating Reaction
An alternative approach for carbaryl determination based on the change in the oscillation period of the Belousov-Zhabotinsky (BZ) reaction under the addition of carbaryl is demonstrated. The oscillations were observed by spectrophotometric measurement at 320 nm, corresponding to the maximum absorption wavelength of cerium(IV) catalyst. The oscillation period
J. Braz. Chem. Soc.. Publicado em: 2020-05
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15. Methodology Development and Validation of Amphotericin B Stability by HPLC-DAD
The high worldwide consumption of antibiotics and their complex impurity profiles has drawn the attention of the scientific community to the development and validation of stability methods for these drugs. Amphotericin B is an antibiotic that is a natural fermentation product of bacterium Streptomyces nodosus, used as a broad-spectrum antifungal agent, and i
J. Braz. Chem. Soc.. Publicado em: 2020-05
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16. Louis de Broglie's wave-particle duality: from textbooks’ blackboxes to a chain of reference presentation
Abstract We discuss the proposition of wave-particle duality made by Louis de Broglie in the period of 1922-1924 as well as the narratives of undergraduate Physics textbooks that introduce this topic. After a brief discussion on the nature of scientific reality, we point out the main theories, assumptions and techniques adopted by de Broglie to achieve the r
Rev. Bras. Ensino Fís.. Publicado em: 13/01/2020
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17. Direct Analysis of Human Hair Before and After Cosmetic Modification Using a Recent Data Fusion Method
The cosmetic modification of hair is a very common procedure used to mask or cover evidence at a crime scene. Deoxyribonucleic acid (DNA) tests are expensive and require good-quality collection of samples and a database profile. To overcome these challenges, direct analysis was performed on a large set of hair strands collected from individuals, denoted orig
J. Braz. Chem. Soc.. Publicado em: 2020-01
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18. Development and characterization of photoprotective formulations containing keratin particles
This work deals with development and evaluation of MFQ protective formulation, which contains two organic filters, namely: octyl-p-methoxycinnamate (OMC) and benzophenone-3 (BP-3); a photostabilizing agent called ethylhexylmethoxycrylene (EHMCR) and keratin particles. The MFQ formulation was evaluated in order to measure its pH, spin-spin lattice relaxation
Braz. J. Pharm. Sci.. Publicado em: 20/12/2019
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19. Simultaneous determination of anti-diabetic drugs
A novel reverse phase, isocratic HPLC method is described to separate five anti-diabetic drugs i.e., glimepiride, metformin, sitagliptin, rosiglitazone and pioglitazone. Nucleosil C18 analytical column was used as stationary phase, while mobile phase consisted of acetonitrile:phosphate buffer: methanol (40/40/20, v/v) pH 2.0. Effluent was monitored at a flow
Braz. J. Pharm. Sci.. Publicado em: 20/12/2019
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20. Immediate effects of photobiomodulation with low-level laser therapy on muscle performance: an integrative literature review
RESUMO Objetivo: analisar a influência do laser de baixa intensidade no desempenho muscular e identificar os parâmetros dosimétricos mais utilizados. Métodos: a busca de artigos foi realizada nas plataformas PubMed, BVS, Web of Science e SciELO. Foram selecionados artigos originais, com resumo disponível e que avaliaram o uso da fotobiomodulação sob
Rev. CEFAC. Publicado em: 28/10/2019
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21. Effect of Pressure Gradient on the Development of Görtler Vortices
ABSTRACT: Boundary layers over concave surfaces may become unstable due to centrifugal instability that manifests itself as stationary streamwise counter rotating vortices. The centrifugal instability mechanism in boundary layers has been extensively studied and there is a large number of publications addressing different aspects of this problem. The results
J. Aerosp. Technol. Manag.. Publicado em: 24/10/2019
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22. Application of the fundamental parameter method to the assessment of major and trace elements in soil and sediments from Osamu Utsumi uranium mine by WDXRF
Abstract Wavelength dispersive X-ray fluorescence spectrometry (WDXRF) is a suitable technique for the characterization of contaminated mining sites, providing a quick and reliable screening for areas of significant contamination. This study established and validated a non-destructive methodology for quantitative simultaneous determination of major and minor
REM, Int. Eng. J.. Publicado em: 16/09/2019
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23. Frequency Domain Interleaving for Dense WDM Passive Optical Network
Abstract In this work, we introduce a new concept of frequency interleaving applied to passive optical networks based in Dense Wavelength Division Multiplexing (DWDM). In order to explore colorless ONUs approach, a single and centralized optical source is used to create the interleaved wavelengths for the downstream and upstream path. In this case, frequency
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 19/06/2019
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24. Study and Optimization of Raman Amplifiers in Tellurite-Based Optical Fibers for Wide-Band Telecommunication Systems
Abstract Here we present a numerical analysis and the optimization of a multi-pump discrete Raman amplification system based on the use of a Tellurite optical fiber as the gain media. By using previously reported optimization techniques we were able to exploit the high Raman gain of Tellurite optical fibers and its multipeak spectrum to achieve amplification
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 19/06/2019