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SciELO - Scientific Electronic Library Online (52.285 recursos)
SciELO (Scientific Electronic Library Online) is an electronic library covering a selected collection of Brazilian scientific journals. The objective of the site is to implement an electronic virtual library, providing full access to a collection of serial titles, a collection of issues from individual serial titles, as well as to the full text of articles. The project envisages the development of a common methodology for the preparation, storage, dissemination and evaluation of scientific literature in electronic format.

Mostrando recursos 1 - 20 de 1.436

1. Defeitos superficiais em 2H-WS2 observados por microscopia de tunelamento - Wypych,F.; Weber,Th.; Prins,R.
Although no impurity or stacking faults could be detected by X-ray diffraction, STM images obtained with negative bias voltage showed two kinds of defects.

2. Efeito do campo magnético na precipitação de parafinas - Rocha,Nelson de Oliveira; González,Gaspar; Vaitsman,Delmo Santiago
To minimize paraffin precipitation, the application of magnetic field in the petroleum path has been suggested based on empiric studies.

3. Modificação por via enzimática da composição triglicerídica do óleo de piqui (Caryocar brasiliense Camb) - Facioli,Nara Lúcia; Gonçalves,Lireny A.G.
Piqui (Caryocar brasiliense Camb) oil was transformed into a cocoa butter-like fat through an enzymatic interesterification reaction using Lipozyme in the presence of stearic acid that was incorporated in the sn 1,3-3,1 position into triglyceride.

4. Eletrólise de resíduos poluidores: I - Efluente de uma indústria liofilizadora de condimentos - Angelis,Dejanira F. de; Corso,Carlos R.; Bidoia,Ederio D.; Moraes,Peterson B.; Domingos,Roberto N.; Rocha-Filho,Romeu C.
Wastewater from a seasoning freeze-drying industry was electrolysed to increase its biodegradability.

5. Modelagem dos processos químicos em plasmas de misturas gasosas usadas na corrosão de silício. Parte 1: CF4 / O2 - Bauerfeldt,G. F.; Arbilla,G.
The plasma etching of semiconductor surfaces with fluorine-containing compounds has technological interest.

6. Modelagem dos processos químicos em plasmas de misturas gasosas usadas na corrosão de silício. Parte 2: SF6 / O2 - Bauerfeldt,G. F.; Arbilla,G.
The model was compared with experimental data for the plasma etching of silicon and with the calculated results for the CF4 / O2 system.

7. Excitação eletrônica das moléculas de metacrilato de metila e estireno na região do ultravioleta de vácuo - Rocco,M. L. M.; Souza,G. G. B. de; Lopes,M. C. A.; Lucas,C. A.
Angle-resolved electron energy-loss spectra have been measured for the methyl methacrylate (MMA) and styrene molecules in the 0 - 50 eV energy range.

8. Determinação espectrofotométrica de ácido ascórbico em fármacos empregando amostragem binária em fluxo - Paim,Ana Paula S.; Kronka,Eloisa Ap. M.; Reis,Boaventura F.; Korn,Mauro
A flow system procedure for spectrophotometric determination of ascorbic acid in drugs based on [Fe3+(SCN-)n]+3-n complex decomposition by reduction is described.

9. Uma metodologia para o projeto teórico de conversores moleculares de luz - Andrade,Antônio V. M. de; Costa Jr.,Nivan B. da; Simas,Alfredo M.; Longo,Ricardo L.; Malta,Oscar L.; Sá,Gilberto F. de
A technique is introduced for the theoretical prediction of eletronic spectra of the organic part of lanthanide complexes by replacing the metal ion by a point charge with the ligands held in their positions as determined by the SMLC/AM1, and by computing the theoretical spectra via the intermediate neglect of differential overlap/spectroscopic-configuration interaction (INDO/S-CI).

10. Extração líquido-líquido em sistemas de fluxo - Facchin,Ileana; Pasquini,Celio
The advances in this area are reported, including the use of monosegmented flow systems to perform metal extraction through both two-phase and single phase processes.

11. A fotocatálise heterogênea e sua aplicação ambiental - Nogueira,Raquel F. P.; Jardim,Wilson F.
This article gives some basic principles of heterogeneous photocatalysis using titanium dioxide as photocatalyst and the state of art of its applications to the abatement of aqueous and atmospheric pollutants.

12. A contaminação dos oceanos por radionuclídeos antropogênicos - Figueira,Rubens C. L.; Cunha,Ieda I. L.
Several hundreds of artificial radionuclides are produced as the result of human activities, such as the applications of nuclear reactors and particle accelerators, testing of nuclear weapons and nuclear accidents.

13. Ultramicroeletrodos. Parte II: construção e aplicações - Silva,S. M.; Alves,C. R.; Correia,A. N.; Martins,R. M.; Nobre,A. L. R.; Machado,S. A. S.; Mazo,L. H.; Avaca,L. A.
Disc shaped UME are produced by embedding metal wires on insulating materials such as glass or epoxy resin.

14. Anticorpos catalíticos: expandindo o alcance da catálise enzimática - Justo,Giselle Zenker
The vast binding repertoire of the immune system has been exploited for the generation of tailor-made selective catalysts.

15. Estratégias para a obtenção de compostos farmacologicamente ativos a partir de plantas medicinais: conceitos sobre modificação estrutural para otimização da atividade - Cechinel Filho,Valdir; Yunes,Rosendo A.
In the present paper we discuss, based in our experience, some experimental procedures which may be employed for isolation of active compounds from medicinal plants.

16. Porta-amostras polimérico para espectroscopia infravermelha de sistemas líquidos aquosos ou orgânicos - Wassermann,Adriana I.; Gorga,Carlos J. P.; Baumhardt-Neto,Ricardo
Infrared spectroscopy laboratories works under permanent care with respect to water contamination, mainly in liquid samples.

17. Modificação de um micro-extrator de vidro para pré-enriquecimento de traços de pesticidas organoclorados de água para análise por cromatografia gasosa - Rocha,Eduardo Carasek da; Pini,Glaucia Falleiros; Augusto,Fabio; Valente,Antonio Luiz Pires
Two models of a glass micro-extractor were constructed after modification of a model proposed in the literature.

18. Simulação do processo Solvay no laboratório didático - Araújo,Adriano L. de; Neves,Carlos A.; Ferreira,Ana Maria C.; Koiti,Araki
The Solvay Process is an important route for the industrial preparation of sodium carbonate from brine and CO2.

19. Editorial

20. Troca iônica no estado sólido de európio3+ em zeólita Y: influência do tempo de reação - Nassar,Eduardo J.; Serra,Osvaldo A.; Souza-Aguiar,Eduardo F.
Rare earth elements supported in zeolites are the most important catalysts in the fluid cracking of petroleum.

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