Element Determinations
Mostrando 1-12 de 26 artigos, teses e dissertações.
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1. Educação pública como direito social: desafios para a construção de um sistema articulado no Brasil
Resumo Este artigo analisa, por meio de revisão de literatura, referenciada teoricamente na pedagogia histórico-crítica, determinações fundamentais da educação pública no Brasil, buscando compreender os desafios colocados para a efetivação de uma práxis educativa radicalmente voltada à emancipação humana. São tratadas três questões intimamen
Rev. katálysis. Publicado em: 14/11/2019
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2. The performance of the (U+Th)/He thermochronology laboratory at UNESP Rio Claro, Brazil
We have developed the first laboratory for (U-Th-Sm)/He thermochronology measurements in South America. Helium is measured using a high-sensitivity magnetic sector mass spectrometer (GVI-Helix-SFT) and a double focusing single collector inductively coupled plasma mass spectrometer (Thermo Scientific ELEMENT2) is used for U, Th and Sm determinations. Repeated
An. Acad. Bras. Ciênc.. Publicado em: 21/03/2019
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3. Interlaboratory Comparison of Quantifying Hydrocarbons and Trace Elements in Sediment Samples from a Tropical Estuary
The Marine and Environmental Studies Laboratory at PUC-Rio, in partnership with the PETROBRAS R&D Center (Brazil), conducted an interlaboratory comparison of aliphatic and aromatic hydrocarbons and trace element determinations. The goal of this study was to produce a homogeneous and stable material and obtain consensus concentration values for its use as a r
J. Braz. Chem. Soc.. Publicado em: 2015-02
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4. Estudo sobre determinação de elementos químicos em unhas humanas pelo método de análise por ativação com nêutrons / A study on chemical element determinations in human nails by neutron activation analysis
As análises de unhas têm sido objeto de estudo para avaliar os níveis de elementos acumulados no organismo humano e com aplicações deste tecido na monitoração da exposição ocupacional ou ambiental, na avaliação do estado nutricional, na identificação da intoxicação por metais tóxicos e na diagnose ou prevenção de doenças. As análises de u
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/08/2012
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5. Especiação redox de crômio em amostras de solos contaminados / Redox especiation of chromium in contaminated soil samples
Chromium and its compounds are employed in various industrial processes, and these activities are responsible for the disposal of significant amounts of materials containing this element in the environment. Due to the known toxic feature of Cr(VI) in biological systems, the determination of chromium species has acquired great importance in environmental chem
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/03/2012
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6. Desenvolvimento de um equipamento portátil e de sistema de análises em fluxo empregando multicomutação. Determinação fotométrica de ferro em águas de rios / Development of a portable equipment and a flow analysis system employing multicommutation. Photometric determination of iron in river waters
Iron is the most abundant element on Earth and plays an important role in biogeochemical cycles. In this work, an automatic analytical procedure was developed for the photometric determination of iron in river waters, employing a LED-based photometer and solenoid mini-pumps for solution handling. The proposed procedure was based on the reaction between iron
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/07/2011
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7. Multivariate Analysis of ICP OES Calibration Conditions for Sequential Extraction of Metals Ions.
Sequential extraction procedures are normally applied to evaluate sediments, soils and plants. The reagents are often selected with the intention that they should target well-defined minerals phases although specíficity cannot be guaranteed. Inductively coupled plasma aptical emission spectrometry (ICP OES) is an instrumental technique that can be used for
EURO ANALYSIS. Publicado em: 2011
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8. O realismo nos escritos de Georg Lukács dos anos trinta: a centralidade da ação / Realism on Georg Lukácswritings from the thirties: the centrality of action
This research aims to analyze and discuss Georg Lukács account on artistic realism as presented in selected aesthetical-literary writings from the thirties. It pursues the course of his acquisition of theory of realism during the decade focusing on the process of appropriation of action as a chief literary element, in its organic relation to the typical. On
Publicado em: 2010
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9. Trabalho médico e alienação: as transformações das práticas médicas e suas implicações para os processos de humanização/desumanização do trabalho em saúde / Medical work and alienation: the transformations in medical practice and their implications on the humanization/dehumanization processes in health practice
The subject of humanization of health services and health practices has been the object of several researches in the field of collective health due to its importance for the constitution of practices and services focused on the care and completeness of attention. The present study aimed to analyse the contemporary changes in medical work and their inplicatio
Publicado em: 2010
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10. Teatro Idealizado, teatro Possível: uma estratégia educativa em Ouro Preto (1850-1860)
This masters dissertation investigates the educative role of the theatre in Ouro Preto, as space and text, in the decade of 1850. In order to execute the research we used as data the Empire Eaws which ruled the theatre in that period; some newspapers published in Ouro Preto during the decade of 1850 O Conciliador, O Bom Senso, O Fiscal, Correiro Official de
Publicado em: 2009
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11. Desenvolvimento de métodos para determinações elementares em cimentos por espectrometria de absorção atômica com forno de grafite e amostragem direta de sólidos / Development of methods for elemental determination in cements by atomic absorption spectrometry with graphite furnace and direct solid sampling
The objective of this work was the development of analytical methods for the determination of Cd, Pb, Cu, Ni, Co, Cr e Mn in Portland cement by solid sampling graphite furnace atomic absorption spectrometry. It was not necessary any pretreatment of the samples, because the particles size (12 µm) were apropriated for direct solid analysis. The heating pr
Publicado em: 2008
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12. Otimização da metodologia de determinação de molibdênio em solos e plantas por voltametria de onda quadrada com redissolução catódica adsortiva / Optimization of the molybdenum determination in soils and plant methodology by cathodic adsorptive stripping square- wave voltammetry
Molybdenum is an element essential to life that can be found practically in the whole biosphere. It is present in the nitrase enzyme cofactor and is responsible for the reduction of the N2 molecule and its fixation in the terrestrial crust. In other enzymes, molybdenum acts in reactions of transference of atoms of oxygen to a lot of sub-stratums. Molybdenum
Publicado em: 2008