Vibration
Mostrando 1-12 de 897 artigos, teses e dissertações.
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1. VIBRATION CHARACTERISTICS, CHEMICAL BONDS AND WEAK INTERACTIONS OF 4- AND 5-HYDROXYSALICYLIC ACID INVESTIGATED BY TERAHERTZ SPECTROSCOPY AND DENSITY FUNCTIONAL THEORY
The terahertz (THz) absorption spectra of 4- and 5-hydroxysalicylic acid were measured by terahertz time-domain spectroscopy (THz-TDS) in the range of 0.4-2.8 THz. The unit cells of both were calculated by density functional theory (DFT), and the theoretical simulation and experimental data were basically in agreement. To further interpret the origin of the
Química Nova. Publicado em: 2022
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2. Design, development, and implementation of 3D-printed polylactic acid centrifuge rotors for laboratory-scale applications
In this work, self-made laboratory centrifuge equipment was developed for the separation of suspensions and immiscible liquids. This centrifuge was based on the Arduino microcontroller and fabricated from simple and recycled mechanical and electronic parts, spending an inexpensive budget suitably. The centrifuge frame and rotors were manufactured of Polylact
Química Nova. Publicado em: 2022
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3. Designing and fabrication of a low-cost dip-coater for rapid production of uniform thin films
In this work, a self-made dip-coater equipment was developed for the fabrication of thin films. The assembly of the apparatus was carried out using simple mechanical and electronic pieces, recycle parts, and spending an inexpensive budget suitably. The production, software design, and features of the device were focused on the sol-gel dip-coating method, whi
Química Nova. Publicado em: 2022
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4. K2O SUPORTADO EM ZEÓLITA NATURAL: SÍNTESE, CARACTERIZAÇÃO E APLICAÇÃO PRODUÇÃO DE BIODIESEL A PARTIR DO ÓLEO DE GIRASSOL
Biodiesel is a renewable fuel, a substitute for fossil diesel, which is important for reducing GHG in Brazil. Therefore, this work aims to synthesize and characterize the catalyst using the support of natural zeolite impregnated with K2O and apply it in the production of biodiesel through the transesterification reaction. Through the analysis of characteriza
Química Nova. Publicado em: 2022
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5. Short-term effects of Whole-Body Vibration on clinical, cardiac, and ambulatory electrocardiographic (Holter) parameters of healthy younger and older adult male non-athletic crossbreed dogs
RESUMO O estudo teve como objetivo avaliar os efeitos agudos da vibração de corpo inteiro (VCI) nos parâmetros clínicos, cardíacos e eletrocardiográficos ambulatoriais (Holter) de cães jovens e adultos hígidos sem raça definida e não atletas. Quatorze cães foram divididos em dois grupos de sete cães, de acordo com a idade: Grupo I (GI) - entre 12
Arquivo Brasileiro de Medicina Veterinária e Zootecnia. Publicado em: 2022
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6. Efeitos da vibração do tendão muscular no equilíbrio após acidente vascular cerebral: revisão sistemática
RESUMO Após o acidente vascular cerebral (AVC), as pessoas apresentam combinações complexas de déficits sensoriais, motores, cognitivos e emocionais que podem afetar o equilíbrio estático e dinâmico. O objetivo do estudo foi compilar e resumir as principais características e achados de protocolos utilizados em pesquisas que investigaram os efeitos da
Fisioterapia e Pesquisa. Publicado em: 2022
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7. Osmotic dehydration kinetics of fresh and frozen blueberries considering volume shrinkage in a novel ternary solution
Abstract Osmotic dehydration is a nonthermal processing technology, that is limited in blueberries because of the osmotic agent, temperature and efficiency. This study was to prepare a novel ternary solution considering low-sugar, low-salt and low-viscosity requirements and to dehydrate blueberries at 20 °C. The mass transfer kinetics of fresh and frozen bl
Food Sci. Technol. Publicado em: 2021-09
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8. Analysis of the Dynamic Stability of Ball-End Milling of AISI D6 Hardened Steel
AISI D6 hardened steel is a difficult to cut material that it is employed in mould and die manufacturing where long ball-end mills are frequently required to machine deep cavities. This condition can lead to excessive vibration between tool and workpiece resulting in a poor surface finishing and reduced tool life. This work analyses the dynamic stability of
Mat. Res.. Publicado em: 02/12/2019
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9. Glottal Closure inWomen with No Voice Complaints or Laryngeal Disorders
Abstract Introduction The understanding of normal vocal production is essential to guide any voice professional as it is fundamental to understand the effects of the posterior glottal gap on the vocal quality. Objective The aim of the present study was to verify the association between glottic closure, acoustic parameters, and some characteristics of the
Int. Arch. Otorhinolaryngol.. Publicado em: 25/11/2019
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10. Effects of Mechanical Vibration in Neuromuscular Junctions and Fiber Type of the Soleus Muscle of Oophorectomized Wistar Rats
Resumo Objetivo Avaliar as junções neuromusculares (JNMs) e o tipo de fibras musculares do músculo sóleo de ratas Wistar ooforectomizadas e submetidas a um protocolo de vibração mecânica. Métodos Foram utilizadas 36 ratas randomizadas nos grupos pseudo-ooforectomia sem e com tratamento e ooforectomia sem e com tratamento. O tratamento foi realizado
Rev. bras. ortop.. Publicado em: 14/11/2019
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11. Análise do desempenho de adensamento da massa refratária de sílica usada em fornos de indução
Resumo As indústrias de fundição de ferro fundido usam em seu processo grande quantidade de sucata zincada, o que tem contribuído para a redução da campanha do revestimento refratário de fornos de indução a cadinho já que o vapor de zinco formado no aquecimento migra para o centro do refratário, condensando em regiões externas do forno, próximo
Cerâmica. Publicado em: 14/11/2019
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12. Continuously monitored lactose crystallization in a vibrated bed
Resumo O estudo visa avaliar a distribuição de tamanho cristalino e a microscopia da fase cristalina na cristalização isotérmica de lactose, usando alta concentração de sementes (fase densa). O monitoramento in-line foi realizado utilizando as sondas de medição de reflexão de feixe focalizado (FBRM) e de medição de visão de partículas (PVM), um
Braz. J. Food Technol.. Publicado em: 14/11/2019