Point Cloud
Mostrando 13-24 de 81 artigos, teses e dissertações.
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13. A Comparative Study of Cartesian and Delta 3D Printers on Producing PLA Parts
The additive manufacturing processes emerged at the end of the last century and became popular by low-cost 3D printers. The most used printers work on a cartesian configuration, but recently were launched delta machines. These 3D printers use a more complex control system due to their trajectories generation but may present some advantages over the cartesian
Mat. Res.. Publicado em: 05/02/2018
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14. Application of a Novel Micro-Cloud Point Extraction for Preconcentration and Spectrophotometric Determination of Azo Dyes
A novel room temperature micro-cloud point extraction procedure using triton X-114 surfactant as extracting phase was developed for preconcentration and extraction of three azo dyes (orange G, methyl orange, and acid red 18) from aqueous samples using molecular absorption spectrophotometry in the visible region. The effects of different parameters such as co
J. Braz. Chem. Soc.. Publicado em: 2016-09
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15. Multivariate Optimization of a Simultaneous Cloud Point Extraction Procedure of Cd, Cu and Ni from Sediments Samples and Determination by ICP OES
A simultaneous preconcentration method for cadmium, copper and nickel in samples of sediments and determination by inductively coupled plasma optical emission spectrometry was developed. The method is based on the extraction of the metals as complexes formed with 2-(5-bromo-2-pyridylazo)-5-(diethylamino)-phenol (5-Br-PADAP) at cloud point of the nonionic sur
J. Braz. Chem. Soc.. Publicado em: 2016-04
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16. Assessing biomass based on canopy height profiles using airborne laser scanning data in eucalypt plantations
This study aimed to map the stem biomass of an even-aged eucalyptus plantation in southeastern Brazil based on canopy height profile (CHPs) statistics using wall-to-wall discrete return airborne laser scanning (ALS), and compare the results with alternative maps generated by ordinary kriging interpolation from field-derived measurements. The assessment of st
Sci. agric. (Piracicaba, Braz.). Publicado em: 2015-12
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17. Determination of Polycyclic Aromatic Hydrocarbons in Groundwater Samples by Gas Chromatography-Mass Spectrometry After Pre-Concentration Using Cloud‑Point Extraction with Surfactant Derivatization
A cloud-point extraction (CPE) method using the surfactant (30)p-tert-octylphenol polyoxyethylene (OPEO30) was proposed as the preceding step for the determination of polycyclic aromatic hydrocarbons (PAHs) by gas chromatography-mass spectrometry (GC-MS). Given the need for surfactant derivatization before the chromatographic analysis, the reaction condition
J. Braz. Chem. Soc.. Publicado em: 2015-05
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18. Cadmium and Lead Determination in Freshwater and Hemodialysis Solutions by Thermospray Flame Furnace Atomic Absorption Spectrometry Following Cloud Point Extraction
Cloud point extraction was employed for the separation and preconcentration of cadmium and lead prior to the determination by thermospray flame atomic absorption spectrometry. Di-2- pyridyl ketone salicyloylhydrazone (DPKSH) was used as complexing agent and the cadmium and lead complexes were extracted from the aqueous phase by the Triton X-114 surfactant. T
J. Braz. Chem. Soc.. Publicado em: 2015-03
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19. Influence of salts on the coexistence curve and protein partitioning in nonionic aqueous two-phase micellar systems
Aqueous two-phase micellar systems (ATPMS) can be exploited in separation science for the extraction/purification of desired biomolecules. Prior to phase separation the surfactant solution reaches a cloud point temperature, which is influenced by the presence of electrolytes. In this work, we provide an investigation on the cloud point behavior of the nonion
Braz. J. Chem. Eng.. Publicado em: 2014-12
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20. Avaliação da combinação da nebulização discreta e processos de microextração aplicados à determinação de molibdênio por espectrometria de absorção atômica com chama (FAAS)
Simple and sensitive procedures for the extraction/preconcentration of molybdenum based on vortex-assisted solidified floating organic drop microextraction (VA-SFODME) and cloud point combined with flame absorption atomic spectrometry (FAAS) and discrete nebulization were developed. The influence of the discrete nebulization on the sensitivity of the molybde
Quím. Nova. Publicado em: 2014-04
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21. Ligand-less rapidly synergistic cloud point extraction as an efficient method for the separation and preconcentration of trace amounts of lead from food and water samples
Um procedimento de extração no ponto nuvem de sinergia rápida foi desenvolvido para a separação e determinação de traços de chumbo em amostras de água e de alimentos antes da determinação por espectrometria de absorção atômica com chama (FAAS). A extração no ponto nuvem de sinergia rápida (RS-CPE) simplifica e acelera de forma eficiente o pr
J. Braz. Chem. Soc.. Publicado em: 2014-04
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22. Determination of triamterene in human plasma and urine after its cloud point extraction
A new analytical approach was developed involving cloud point extraction (CPE) and spectrofluorimetric determination of triamterene (TM) in biological fluids. A urine or plasma sample was prepared and adjusted to pH 7, then TM was quickly extracted using CPE, using 0.05% (w/v) of Triton X-114 as the extractant. The main factors that affected the extraction e
Quím. Nova. Publicado em: 2014
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23. Ligandless cloud point extraction of trace amounts of palladium and rhodium in road dust samples using Span 80 prior to their determination by flame atomic absorption spectrometry
In this study, a procedure is developed for cloud point extraction of Pd(II) and Rh(III) ions in aqueous solution using Span 80 (non-ionic surfactant) prior to their determination by flame atomic absorption spectroscopy. This method is based on the extraction of Pd(II) and Rh(III) ions at a pH of 10 using Span 80 with no chelating agent. We investigated the
Quím. Nova. Publicado em: 2014
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24. Tecnologías emergentes en la educación: una experiencia de formación de docentes que fomenta el diseño de ambientes de aprendizaje
This paper describes the results of a teacher training experience with a group of students taking the elective Emerging Technologies in Education (in the Maestría en Informática Educativa course at Universidad de La Sabana), whose aim is to "offer students a space for reflection and conceptualization on main emerging technologies (ET) and their uses in edu
Educ. Soc.. Publicado em: 2013-06