Electrical Resistivity Method
Mostrando 13-24 de 32 artigos, teses e dissertações.
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13. Electrical Behavior of Carbon Fiber/Phenolic Composite during Pyrolysis
Carbon fiber reinforced carbon (CFRC) composites, also called carbon/carbon (C/C) composites are materials with superior characteristics such as low density, good thermal shock resistance, high strength and low ablation under severe environments. Due to their properties, CFRC composites are ideal candidate in the high temperature fields. By pyrolysis process
Mat. Res.. Publicado em: 03/11/2015
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14. Use of Direct Current Resistivity Measurements to Assess AISI 304 Austenitic Stainless Steel Sensitization
This paper describes the feasibility of using direct current electrical resistivity measurements to evaluate AISI 304 austenitic stainless steel sensitization. ASTM A262 – Practice A and double loop electrochemical potentiodynamic reactivation (DL-EPR) tests were performed to assess the degree of sensitization (DoS) qualitatively and quantitatively, and el
Mat. Res.. Publicado em: 2015-04
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15. Development of Electrical Conduction with Beryllium Doping of CdO Nanostructure thin Films
The objective of the present investigation is to study the effect of beryllium doping on the structural, optical, and electrical properties of CdO, focusing on the improvement of carrier mobility (μ) that accompanied with high electrical conductivity and good optical transparency in the near-infrared region. Thus, nanocrystallite Be-doped CdO films were pre
Mat. Res.. Publicado em: 2015-02
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16. Evaluation of piezoresistivity properties of sputtered ZnO thin films
Zinc oxide (ZnO) thin films were deposited by RF reactive magnetron sputtering on silicon (100) substrates under different experimental conditions. ZnO films were studied before and after annealing treatment at 600 °C. The crystallinity, electrical resistivity, stoichiometry, thickness, and elastic modulus of the films were investigated. ZnO piezoresistors
Mat. Res.. Publicado em: 03/06/2014
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17. Definition of management zones in coffee production fields based on apparent soil electrical conductivity
Fertilizer application at variable rates requires dense sampling to determine the resulting field spatial variability. Defining management zones is a technique that facilitates the variable-rate application of agricultural inputs. The apparent electrical conductivity of the soil is an important factor in explaining the variability of soil physical-chemical p
Scientia Agricola. Publicado em: 2012-06
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18. Magnetic and dielectric proprieties of multiferroic (1-x)Pb(Fe2/3W1/3)O3 -XPbTiO3 Ceramics prepared via a modified two-stage solid-state reaction
Multiferroic Pb(Fe2/3W1/3)O3-PbTiO3 (PFW-PT) ceramics were synthesized via a modified two-stage solid-state reaction. This method utilized Fe2WO6, prepared at a first-stage, which was subsequently reacted with a stoichiometric amount of PbO and TiO2 at the second stage. This procedure efficiently suppressed the formation of lead tungstates and leads to getti
Materials Research. Publicado em: 28/10/2011
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19. Study of optical and electro-optical properties of diamond-like carbon films - DLC. / Estudo das propriedades ópticas e eletro-ópticas de filmes de carbono amorfo tipo diamante - DLC.
In this work it was studied electrical and optical characteristics of diamond-like carbon (DLC) films deposited in a reactive RF magnetron sputtering system on silicon and glass substrates. Samples were deposited at different process conditions in each type of substrate at two pressure conditions (5 mTorr and 10 mTorr) and four conditions of RF power (100 W,
Publicado em: 2010
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20. Reconstrução tridimensional de meios porosos utilizando técnicas de simulated annealing
The characterization of porous materials constitutes a problem of scientific and technological interest. Determination of the macroscopic properties of the porous medias have application in many areas, such as production of petroleum, civil and mechanical engineering, for example. In the present work are presented computational methods to estimate the intrin
Publicado em: 2009
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21. RESISTIVIDADE ELÉTRICA DE CONCRETOS DE CIMENTO PORTLAND BRANCO E ELEVADOS TEORES DE ESCÓRIA DE ALTO FORNO / ELECTRICAL RESISTIVITY OF WHITE PORTLAND CEMENT CONCRETES AND HIGH BLAST FURNACE SLAG CONTENT
The electrical resistivity is an important concrete property that allows evaluating the access facility of aggressive agents before the corrosion process begins and estimates the velocity of the same process after it begun. The electrical resistivity and the oxygen availability are the characteristics that control the corrosion velocity. This work aimed to e
Publicado em: 2008
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22. Vinasse influence detection in soil electrical resistivity by geophysics data analysis : a case study at Sepe, Tiaraju, settlement of landless agricultural laborers, SP / Detecção da influencia da vinhaça na resistividade do solo atraves da analise de dados geofisicos : um estudo de caso no assentamento Sepe, Tiaraju, SP
The vinasse, a waste produced in the proportion of 13 liters for each liter of alcohol. It has a high potential of polluting groundwater and superficial water resources, changes the soil behaviour and can also develop sanilization problems. This work aims to evaluate the efficiency of the DC-resistivity method in detecting and mapping anomalies caused by, in
Publicado em: 2008
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23. Micro e nanofabricação (fabricação de contatos eletricos) por feixe de ions focalizados / Micro and nano (manufacture of electrical contacts) with focused ion beam
Nanoscale science and technology is a young and burgeoning field that encompasses nearly every discipline of science and engineering, the rapid growth of the field in the past decades has been enable by the sustained advances in the fabrication and characterization of materials. This work presents the hybrid process for fabrication of micro and nanocontacts,
Publicado em: 2007
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24. Um estudo do imageamento geoelétrico na investigação rasa / A study of the geoelectrical resistivity imaging for shallow investigations
Este trabalho trata do estudo detalhado e com profundidade das metodologias de aquisição, processamento e interpretação de dados de caminhamentos elétricos, sob o enfoque de investigações voltadas a objetivos rasos. Nas técnicas de aquisição 2D (caminhamentos) foram utilizados os arranjos dipolo-dipolo, pólo-dipolo, pólo-pólo e Wenner, permitind
Publicado em: 2007