Measurements Experiments
Mostrando 25-36 de 935 artigos, teses e dissertações.
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25. Using Severe Plastic Deformation to Fabricate Strong Metal Matrix Composites
The processing of bulk metals through the application of severe plastic deformation leads to significant grain refinement and a consequent strengthening of the material. High-pressure torsion (HPT) generally refers to the processing of disk samples and this technique is especially effective in producing extremely small grains. Recently, new experiments were
Mat. Res.. Publicado em: 23/10/2017
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26. Yeast fermentation of sugarcane for ethanol production: Can it be monitored by using in situ microscopy?
ABSTRACT This paper addresses some key issues related to the automation of fermentation process analysis in the context of industrial-scale ethanol production from sugarcane substrates. As the current methods for the determination of cell density and viability are time consuming and laborious, high resolution in situ microscopy (0.5µm) is proposed as a prom
Braz. J. Chem. Eng.. Publicado em: 2017-10
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27. Investigation of Electrocatalysts for Selective Reduction of CO2 to CO: Monitoring the Reaction Products by on line Mass Spectrometry and Gas Chromatography
The carbon dioxide electrocatalytic reduction is central for the development of regenerative cycles of electrochemical energy conversion and storage. Herein, the gaseous products of the CO2 electroreduction were monitored by using an electrochemical cell on line coupled to a differential electrochemical mass spectrometer (DEMS), aiming at searching for elect
J. Braz. Chem. Soc.. Publicado em: 2017-09
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28. Leaf area estimation from linear measurements in different ages of Crotalaria juncea plants
ABSTRACT The goal of this study was to estimate the leaf area of Crotalaria juncea according to the linear dimensions of leaves from different ages. Two experiments were conducted with C. juncea cultivar IAC-KR1, in the 2014/2015 sowing seasons. At 59, 82, 102, 129 days after sowing (DAS) of the first and 61, 80, 92, 104 DAS of the second experiment, 500 lea
An. Acad. Bras. Ciênc.. Publicado em: 31/08/2017
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29. Evaluation of the anticorrosion performance of peel garlic extract as corrosion inhibitor for ASTM 1020 carbon steel in acidic solution
ABSTRACT Metallic corrosion can be delayed using corrosion inhibitors. However, several industrial corrosion inhibitors are toxic and harmful to the environment and to the human health. In this context, in the last decades, research has been developed to investigate the performance of low toxicity corrosion inhibitors as green inhibitors obtained from vegeta
Matéria (Rio J.). Publicado em: 10/08/2017
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30. Longitudinal model for categorical data applied in an agriculture experiment about elephant grass
ABSTRACT Experiments where the response is a categorical variable are usually carried out in many fields such as agriculture. In addition, in some situations this response has three or more levels without an order between them characterizing a multinomial (nominal) response. Statistical models for scenarios where the observations of a nominal response can be
Sci. agric. (Piracicaba, Braz.). Publicado em: 2017-08
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31. Model-assisted phenotyping by digital images in papaya breeding program
ABSTRACT Manual phenotyping for papaya Carica papaya (L) breeding purposes limits the evaluation of a great number of plants and hampers selection of superior genotypes. This study aimed to validate two methodologies for the phenotyping of morpho-agronomic plant traits using image analysis and fruit traits through image processing. In plants of the ‘THB’
Sci. agric. (Piracicaba, Braz.). Publicado em: 2017-08
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32. Mechanisms of Ion Detection for FET-Sensors Using FTO: Role of Cleaning Process, pH Sequence and Electrical Resistivity
The use of FTO samples as an extended gate field effect transistor biosensor is presented. The FTO samples were produced by spray pyrolysis technique. The cleaning process is shown to have a fundamental importance for the final sensitivity of the samples when multiple re-usage is adopted. The role of electrical resistivity and morphology of the films are inv
Mat. Res.. Publicado em: 31/07/2017
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33. Modeling Root Growth, Crop Growth and N Uptake of Winter Wheat Based on SWMS_2D: Model and Validation
ABSTRACT Simulations for root growth, crop growth, and N uptake in agro-hydrological models are of significant concern to researchers. SWMS_2D is one of the most widely used physical hydrologically related models. This model solves equations that govern soil-water movement by the finite element method, and has a public access source code. Incorporating key a
Rev. Bras. Ciênc. Solo. Publicado em: 22/06/2017
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34. SÍNTESE E CARACTERIZAÇÃO DE SURFACTANTES ALQUILFENIL POLIGLICOSÍDICOS A PARTIR DA AMILOSE E ALQUIL FENÓIS EXTRAÍDOS DO LCC NATURAL
The surfactants were synthesized by condensing the obtained oligosaccharides of amylose and alkyl phenols extracted from the natural cashew nut shell liquid (nCNSL). The Nuclear Magnetic Resonance (NMR) and Fourier Transform Infrared Spectroscopy (FTIR) data showed aromatic ring bands, glycosidic rings, olefins and paraffins. The Nuclear Overhauser Effect Sp
Quím. Nova. Publicado em: 2016-08
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35. Effects of Measurements Conditions on an Extended-Gate FET used as pH sensor
Fluorine-doped tin oxide (SnO2:F) was investigate as the sensitive part of a pH sensor in the extended-gate field effect transistors (EGFET) device, which provided a linear response for pH range from 2 to 12; the sensitivity was 37 mV.pH-1 for experiments performed in absence of light. Neutral pH, leads to a transistor’s electric current remained practical
Mat. Res.. Publicado em: 05/02/2016
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36. Cellulose Nanocrystals Assembled on the Fe3O4Surface as Precursor to Prepare Interfaced C/Fe3O4Composites for the Oxidation of Aqueous Sulfide
In this work, composites based on carbon (1, 10 and 20 wt.%) interfaced with Fe3O4 (magnetite) have been studied as catalysts for the oxidation of aqueous sulfide. The composites were prepared by assembling cellulose nanocrystals surrounding Fe3O4 followed by a controlled thermal decomposition at 400, 600 and 800 ºC. Mössbauer, X-ray diffractometry (XRD),
J. Braz. Chem. Soc.. Publicado em: 2016-02