Constant Current
Mostrando 25-36 de 1145 artigos, teses e dissertações.
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25. Cursos Preparatórios para os Exames de Residência e a Evasão dos Cenários de Prática: Cadê o Interno que Estava Aqui?
RESUMO Embora não seja obrigatória, a residência médica faz parte do processo de ensino e da formação dos médicos e é considerada padrão ouro na modalidade de ensino de pós-graduação lato sensu. Entretanto, o número de vagas para residência médica não acompanhou a expansão dos cursos de graduação em Medicina, gerando uma intensa disputa po
Rev. bras. educ. med.. Publicado em: 2019-03
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26. Physical methods for topical skin drug delivery: concepts and applications
Topical drug delivery is an interesting approach to treat skin diseases and to avoid pain and low patient compliance in cases where a systemic delivery is required. However, the stratum corneum, which is the outermost skin layer, strongly protects the body from the entrance of substances, especially those hydrophilic. In this context, different physical meth
Braz. J. Pharm. Sci.. Publicado em: 08/11/2018
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27. Comprobación de la uniformidad de resultados de un equipo de ensayos simultáneos de termofluencia
ABSTRACT The phenomenon of creep occurs in materials that operate under high temperatures and mechanical stresses, causing changes in their structures; such changes are evidenced by a progressive loss of mechanical strength. The characterization of this phenomenon should be performed with appropriate test machines, which are usually dependent on expensive te
Matéria (Rio J.). Publicado em: 19/07/2018
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28. Caracterización de compositos biocerámicos en esponjas de titanio mediante interpenetración por corriente pulsada asistida
ABSTRACT Recently, it has been directing some special attention to the development of new manufacturing processes, with engineering applications in human tissues [1]. 3D printing applied to tissue engineering requires pulse computational techniques such as stereolithographic modeling, and special manufacturing processes, to name a few; Laser Sintering or Ext
Matéria (Rio J.). Publicado em: 19/07/2018
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29. Influencia de los tratamientos térmicos en recubrimientos anódicos nanotubulares de TiO2
ABSTRACT TiO2 is a semiconductor widely used in heterogeneous photocatalysis processes for water decontamination. Several studies indicate that ordered nanostructures in anatase phase improve the photocatalytic properties with respect to other morphologies and crystal structures of TiO2. The aim of the present work is to evaluate the influence of different t
Matéria (Rio J.). Publicado em: 19/07/2018
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30. Selective Surfaces of Black Chromium for Use in Solar Absorbers
One of the applications of selective surfaces is to improve performance of solar absorbers. The purpose of this work is to produces selective coatings with high absorption of solar radiation in the range of UV/Vis/NIR. It was prepared a selective surface composed of black chromium (Cr/Cr2O3) deposited on substrates of AISI 304 stainless steel using the techn
Mat. Res.. Publicado em: 09/11/2017
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31. ANAEROBIC DIGESTION STABILITY TEST BY SHEWHART CONTROL CHART
ABSTRACT The anaerobic digestion (AD) operation complexity raise the importance of stability testing to verify whether the operating conditions are under control and whether the process is working as required. The current method of verifying process stability is by a range of the ratio between volatile fatty acidity and total alkalinity (VFA/ TA) within whic
Eng. Agríc.. Publicado em: 2017-06
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32. Investigation of Wedge Water-Entry Under Symmetric Impact Loads by Experimental Tests
Abstract One of the main challenges for engineers in designing high-speed crafts is the evaluation of hydrodynamic loads during the impact of hull to wave’s surface. This paper presents an experimental investigation on the pressure distribution on three wedge-sections with 15°, 20° and 30° deadrise during water-entry. Assessment of pressure distribution
Lat. Am. j. solids struct.. Publicado em: 2017-06
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33. Low Potential and Non-Enzymatic Hydrogen Peroxide Sensor Based on Copper Oxide Nanoparticle on Activated Pencil Graphite Electrode
An electrochemical sensor for H2O2 determination was prepared by electrodepositing copper oxide nanoparticles on the activated pencil graphite electrodes. At first, a study has been made of the optimum conditions for chemical activation of the pencil graphite electrodes (APGE) and then the activated pencil graphite electrode was modified with copper oxide na
J. Braz. Chem. Soc.. Publicado em: 2017-05
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34. Biological X-ray irradiator characterization for use with small animals and cells
This study presents the characterization of an X-ray irradiator through dosimetric tests, which confirms the actual dose rate that small animals and cells will be exposed to during radiobiological experiments. We evaluated the linearity, consistency, repeatability, and dose distribution in the positions in which the animals or cells are placed during irradia
Braz J Med Biol Res. Publicado em: 02/03/2017
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35. A New Configuration of Circular Stepped Tubes Reinforced with External Stiffeners to Improve Energy Absorption Characteristics Under Axial Impact
Abstract State-of-the art studies of impact crushing circular stepped tube (inversion tube) introduce various approaches to improve the energy absorption capacities. Adding external longitudinal stiffeners on the circular stepped tubes is a new approach that have a great effect and interest. In the current study, finite element analysis using (LS-DYNA/WORKBE
Lat. Am. j. solids struct.. Publicado em: 2017-02
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36. A Comparative Study on Ag-Doped and Surfactant Assisted MnO2 Prepared by Direct and Pulse Current Electrodeposition on Surgical Grade Stainless Steel as High-Performance Supercapacitor
Direct and pulse current electrodeposition techniques were applied for preparation of novel electro-active manganese oxides. The influences of Ag doping and addition of cetyltrimethylammonium bromide (CTAB) on electrochemical properties were discussed. The morphology and structure of the electrodes are studied by different techniques including field emission
J. Braz. Chem. Soc.. Publicado em: 2017-01