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Mostrando 1-12 de 3022 artigos, teses e dissertações.
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1. Analysis of Al2O3-ZrO2 ceramic insert in turning process of Ti-6Al-4V alloy using grey Taguchi-based response surface methodology (GT-RSM)
Abstract The present investigation aimed at a sustainable green turning operation of Ti-6Al-4V alloy using multi-objective optimization of surface roughness, tool flank wear, material removal rate, and tool wear loss with cutting speed, feed rate, and depth of cut as input parameters. The experiments were performed on a CNC lathe machine using an alumina-zir
Cerâmica. Publicado em: 2022
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2. Magnetic concentration route for recovering pellet feed fines stored in a mining dam
Abstract The greatest and noblest challenge of mining engineering for the present and the future of iron ore treatment could be considered as the pursuit of optimizing the use of mineral resources. The use of mining tailings, in the mineral sector itself, or in another industrial branch, meets the needs of circular economy as it increases the useful service
REM - International Engineering Journal. Publicado em: 2022
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3. A Compact Dual-Band Self-Diplexing MIMO Patch Antenna for ISM and X-Band Communications
Abstract A compact, dual-band, and self-diplexing MIMO patch antenna with a shared aperture is presented for Industrial scientific medical (ISM) band and X-band communications. The structure consists of two orthogonal feed lines and a rectangular slot in a square patch. The size of the FR4 substrate is 50 × 50 × 1.6 mm3. The designed structure operates at
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2022
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4. Comparative evaluation of three classical sizing methods of vibrating screens
Abstract The sizing of vibrating screen machines can be done by various methods, most of them based on the classic method of Allis Chalmers (ACM). Due to the wide diffusion and applicability, the Peter King (PKM) and Karra (KM) methods present great technical relevance as well. The objective of this study was to evaluate and compare the results of the screen
REM - International Engineering Journal. Publicado em: 2022
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5. Effects of ZooBioR2 product as feed supplement in laying hens on the morphofunctional state of intestinal mucosa
RESUMO Spirulina platensis é uma microalga com atividade biológica utilizada para produzir suplementos nutricionais ricos em proteínas, ácidos graxos essenciais, vitaminas e minerais. O estudo atual visa provar o impacto do produto ZooBioR2 (obtido da Spirulina platensis) na saúde e na histologia do duodeno, jejuno, íleo e ceco em galinhas poedeiras. O
Arquivo Brasileiro de Medicina Veterinária e Zootecnia. Publicado em: 2022
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6. The BigFLUX Magnetic Matrix Technology
Abstract The Magnetic separation of ultra-fine ore particles has always posed a challenge to the JONES/WHIMS process. Despite many advances in this technology, no effective improvement has been made to its core component: The Magnetic Matrix. The current approach to separate ultra-fine particles teaches that the gap of the matrix and its teeth size must be s
REM - International Engineering Journal. Publicado em: 2022
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7. A Design of a Compact Microwave Diplexer in Microstrip Technology Based on Bandpass Filters Using Stepped Impedance Resonator
Abstract This paper describes the design of a compact microstrip microwave diplexer based on bandpass filters and a stepped impedance resonator for 4G applications. The diplexer is composed of two band-pass filters (BPF) that operate at 1.8 and 2.5 GHz. Both bandpass filters for the receiver at 1.705-1.895 GHZ and the transmitter at 2.41-2.6 GHZ have a -3dB
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2022
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8. Series Fed Designs of Planar Circular and Hexagonal Microstrip Antenna Arrays for High Gain and Reduced First Side Lobe Level Radiation
Abstract To achieve a high gain and low first side-lobe level, variants of linear and planar series fed circular and hexagonal microstrip antenna arrays using the binomial distribution, are proposed around 3000 MHz frequency band, on thinner Arlon substrate (h ~ 0.027λg). The linear 7 × 1 array of circular patches, yields first side-lobe level of −25 dB
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2022
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9. Classificação da capacidade produtiva com alturas de árvores dominantes estimadas por RNA
Resumo A construção de curvas de sítio a partir da modelagem da altura de árvores dominantes medidas em parcelas permanentes em diferentes idades, considerando uma idade de referência, se constitui no método mais prático e difundido no meio florestal para classificar a capacidade produtiva local. Dentro de um processo de Planejamento Florestal, o grau
Ciência Florestal. Publicado em: 2022
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10. Sweet potato (Ipomea batatas) feed affects intake, digestibility and nitrogen retention of ovine fed with ryegrass hay (Lolium multiflorum Lam)
RESUMO O presente estudo teve como objetivo determinar a viabilidade da inclusão da farinha de batata-doce na ração de ovinos, como estratégia alimentar alternativa ao uso de outras culturas, tradicionalmente utilizadas como suplemento energético. Para isso, foi realizado delineamento em quadrado latino para avaliar os efeitos da suplementação de 0, 0
Arquivo Brasileiro de Medicina Veterinária e Zootecnia. Publicado em: 2022
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11. Breastfeeding in infants seen in private pediatric practices and its relation with type of delivery and history of prematurity
Abstract Objective: To describe the type of milk used to feed infants seen in private pediatric practices in Brazil. To evaluate the relationship between breastfeeding, type of delivery, and history of prematurity. Methods: This is a cross-sectional and observational study that included 4929 infants in the first year of life seen in private pediatric pract
Jornal de Pediatria. Publicado em: 2022
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12. Effect of Lippia grata essential oil as a feed additive on the performance of tambatinga juveniles
RESUMO Lippia grata (previamente conhecida como Lippia gracillis) é uma planta aromática nativa do Brasil, com folhas ricas em óleos essenciais que possuem atividades biológicas significativas. Avaliamos o efeito do óleo essencial de L. grata (OELG) como aditivo alimentar sobre o crescimento, índices somáticos e parâmetros bioquímicos de juvenis (5,
Acta Amazonica. Publicado em: 2022