Small Fields
Mostrando 1-12 de 301 artigos, teses e dissertações.
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1. Radiation Efficiency of an Electrically Small Dual-band UHF Microstrip Patch Antenna Using Wheeler Cap Method
Abstract Determining the radiation efficiency of an antenna is a difficult task that becomes challenging when it is about electrically small antennas. This work investigates the applicability of the Wheeler cap method to measure the radiation efficiency of a UHF dual-band compact microstrip patch antenna. An overview of Wheeler method is presented. An adapta
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2022
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2. The Research on Porphyrins and Analogues in Brazil: A Small Review Covering Catalytic and other Applications since the Beginning at Universidade de São Paulo in Ribeirão Preto until the Joint Venture between Brazilian Researchers and Colleagues from Universidade de Aveiro, Portugal
The synthetic versatility and the potential applications of porphyrins and analogues in different fields have aroused special interest in their study, especially to mimic biological systems, such as cytochrome P-450. The ability of the porphyrin tetrapyrrolic core to accommodate metal ions of varying charges can modulate the type of application of these comp
J. Braz. Chem. Soc.. Publicado em: 24/10/2019
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3. The adoption of Article Processing Charges as a business model by Brazilian Open Access journals
Resumo Diferentes alternativas de financiamento e de modelos de negócio para o acesso aberto às publicações científicas vêm sendo discutidas e testadas, tanto por periódicos da chamada via dourada, quanto por periódicos híbridos. Um crescente número dessas duas modalidades de periódicos tem adotado uma taxa de publicação – mais especificamente
Transinformação. Publicado em: 04/04/2019
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4. Adaptation patterns of winter wheat cultivars in agro-ecological regions
ABSTRACT: Multi-environment trials are commonly used to assess cultivar adaptation patterns under different environmental conditions and to help make effective cultivar recommendations for growers. An example of a multi-environment trial system used for cultivar recommendations is the Polish Post-registration Variety Testing System. A common approach in cult
Sci. agric. (Piracicaba, Braz.). Publicado em: 2019-04
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5. Chemical diversity of the volatiles of Lippia rotundifolia Cham. (Verbenaceae) in Minas Gerais, Brazil
Lippia rotundifolia is an aromatic species, native and endemic to rocky fields, which are isolated by small mountains. It is little known about their chemical composition. Because of that we aimed to study the chemical diversity of volatiles released from rosemary leaves (Lippia rotundifolia Cham.) coming from 11 populations of the Minas Gerais, Brazil. The
An. Acad. Bras. Ciênc.. Publicado em: 21/03/2019
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6. Atrazine degradation patterns: the role of straw cover and herbicide application history
ABSTRACT: In Brazil, atrazine (ATZ) is widely applied to maize (Zea mays L.) fields for weed control. The presence of ATZ and its metabolites in soil and water matrices has become a matter of some concern for governmental authorities as well as for society at large. This study evaluated the patterns of ATZ degradation (mineralization, extractable and non-ext
Sci. agric. (Piracicaba, Braz.). Publicado em: 2019-02
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7. Pipeline Stress Analysis Through Stress Function Fittings
Abstract This work presents a hybrid experimental technique for stress analysis in pipes due to soil-pipe interaction. It was used a variation of Digital Speckle Pattern Interferometry (DSPI) combined with a small indentation setup for acquiring radial displacement points. Data collected are fitted under the Airy stress functions method for the determination
Lat. Am. j. solids struct.. Publicado em: 17/09/2018
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8. Study of friction stir spot welding on AA6063 aluminium alloy used in the ship building industry
ABSTRACT Friction stir spot welding (FSSW) is a novel process of metal joining. In the present work, the authors analysed the possibility of using this process to solve current problems in shipbuilding industry regarding small vessels by replacing the current arc welding techniques with the aforementioned process. Numerical simulation was carried out by the
Matéria (Rio J.). Publicado em: 19/07/2018
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9. Ruido magnético Barkhausen para el estudio de la anisotropía magnética en aceros inoxidables
ABSTRACT The magnetic Barkhausen noise (MBN) is a phenomenon that occurs in ferromagnetic materials when they are exposed to slowly varying magnetic fields, generating discrete jumps in their magnetization. These jumps are produced by the movement of the magnetic domain walls. They can be detected by a small coil allocated on the sample surface. The movement
Matéria (Rio J.). Publicado em: 19/07/2018
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10. Topographic modelling using UAVs compared with traditional survey methods in mining
Abstract The current developments with unmanned aerial vehicles (‘UAVs’) are revolutionizing many fields in civil applications, such as agriculture, environmental and visual inspections. The mining industry can also benefit from UAVs in many aspects, and the reconciliation through topographic control is an example. In comparison with traditional topograp
REM, Int. Eng. J.. Publicado em: 2018-07
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11. Karyotypes of Brazilian non-volant small mammals (Didelphidae and Rodentia): An online tool for accessing the chromosomal diversity
Abstract We have created a database system named CIPEMAB (CItogenética dos PEquenos MAmíferos Brasileiros) to assemble images of the chromosomes of Brazilian small mammals (Rodents and Marsupials). It includes karyotype information, such as diploid number, karyotype features, idiograms, and sexual chromosomes characteristics. CIPEMAB facilitates quick shar
Genet. Mol. Biol.. Publicado em: 28/06/2018
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12. The relative age effect on Brazilian Elite Futsal: Men and Women Scenarios
Abstract AIMS The relative age effect (RAE) has been a research subject in several fields of society. RAE is present in different sports, influencing the young athlete’s opportunities of participation. The aim of this study was to analyze the occurrence of RAE in Brazilian elite men and women futsal. METHODS Birthdate of 376 athletes from Brazilian Men N
Motriz: rev. educ. fis.. Publicado em: 01/02/2018