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Mostrando 13-24 de 476 artigos, teses e dissertações.
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13. Tribology of natural Poly-Ether-Ether-Ketone (PEEK) under transmission oil lubrication
Abstract High performance polymeric materials such as poly-ether-ether-ketone (PEEK) are increasingly being used for challenging tribological applications in order to replace metal parts in vehicle engines and transmissions. The tribology of natural PEEK, under oil-lubricated conditions, was studied for different metal counterbody finishes. Two different fin
Polímeros. Publicado em: 04/07/2019
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14. Investigation on the Wear Properties of Ti/TiC/TiN Composite Coatings Prepared by Powder Cored Wires Through TIG Method at Nitrogen Atmosphere on Titanium Substrate
In this present study, Tungsten Inert Gas (TIG) welding and powder filled cored wires with nitrogen shielding gas were utilized to produce TiC and TiN surface composite coatings on the titanium (Ti) sheet substrate. The TIG procedure was done at same welding parameters for all of prepared samples. Phase analysis and microstructures were done by X-ray Diffrac
Mat. Res.. Publicado em: 15/04/2019
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15. Inspiratory loading exercises on respiratory muscle function in post-operative gastroplasty patients: a randomized clinical trial
Resumo Introdução: O pós-operatório de gastroplastia pode alterar a mecânica respiratória e predispor a complicações respiratórias. Objetivo: Avaliar os efeitos de exercícios com carga inspiratória na função muscular respiratória e na prevalência de atelectasias após gastroplastia. Método: 40 voluntárias foram alocadas randomicamente em:
Fisioter. mov.. Publicado em: 04/04/2019
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16. Evaluation of Alternative Halo Ring Positions in Children Using Tomography
OBJECTIVES: The halo ring can be applied in children, through skeletal traction or a halo vest device, to treat many cervical spine pathologies, including traumatic injuries and pathologies related to deformities. However, the procedure is associated with various complications, such as infection, pin loosening, and respiratory and neurological problems. Alt
Clinics. Publicado em: 14/03/2019
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17. Mechanical Properties and Abrasive Wear of Different Weight Percentage of TiC Filled Basalt Fabric Reinforced Epoxy Composites
Fiber reinforced polymers are very rarely applied as wear-resistant materials because of the lack of good mechanical strength, which adversely affects the properties of the composites. To improve the mechanical and abrasive wear resistant of the composites, fillers are incorporated into the polymers. Hence in this work composites are produced by adding funct
Mat. Res.. Publicado em: 14/01/2019
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18. Optimization of Multiple Performance Characteristics of Friction Stir Welded Joint with Grey Relational Analysis
In the present work, multi-objective optimization of the input welding parameters influencing the quality of weld joint of AA 5052 H32 aluminium alloy by FSW process is investigated using response surface methodology and grey relational analysis. The quality of the welded joint is measured based on the higher value of tensile strength and hardness of the joi
Mat. Res.. Publicado em: 08/11/2018
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19. Protección de acero para instrumentos quirúrgicos con recubrimientos duros en base carbono tipo DLC
ABSTRACT Martensitic stainless steels can be used in different applications such as surgical instruments where a good wear and corrosion resistance are required. Surface modification treatments such as nitriding improve the mechanical properties of these steels, however; they affect the corrosion resistance. For this reason, the DLC (Diamond Like Carbon) coa
Matéria (Rio J.). Publicado em: 19/07/2018
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20. Study of Mechanical and Wear Behaviour of Hyper-Eutectic Al-Si Automotive Alloy Through Fe, Ni and Cr Addition
Effect of Fe, Ni and Cr addition on the wear behavior of hyper-eutectic Al-Si automotive alloy has been studied. Dry sliding wear tests have been conducted using pin-on-disc wear testing machine under normal loads of 20N and constant sliding speed of 0.64 ms-1. Influence of Fe addition to the base alloy increases the wear rate due to the formation of needle
Mat. Res.. Publicado em: 11/06/2018
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21. Paternidade em Diferentes Configurações Familiares e o Desenvolvimento Emocional da Filha
Resumo Diante das alterações rápidas e constantes da sociedade contemporânea, observa-se um processo de redefinição/indefinição do papel paterno. Nesse sentido, objetivou-se compreender como pais inseridos em diferentes configurações familiares experimentam a função paterna, associando suas vivências ao desenvolvimento do self de suas filhas. Pa
Psico-USF. Publicado em: 2018-06
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22. HVOF-sprayed Coating Over AISI 4140 Steel for Hard Chromium Replacement
The replacement of electrolytic hard chrome (EHC) by high velocity oxy-fuel (HVOF) sprayed coatings is investigated due to the toxicity of EHC process. The wear behavior of AISI 4140 steel coated by HVOF-, EHC-process was compared to quenched and tempered (Q&T) steel using a pin-on-disc apparatus. The wear tests were conducted at room temperature, 10 N appli
Mat. Res.. Publicado em: 28/05/2018
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23. Effect of Scroll Pin Profile and Tool Rotational Speed on Mechanical Properties of Submerged Friction Stir Processed AZ31B Magnesium Alloy
In this study, an effort has been made to choose an appropriate tool pin profile and rotational speed for a tool using a submerged friction stir processed hot rolled AZ31B magnesium alloy. A defect free process region was obtained using a novel tool shoulder, which consisted of a scroll. Three tool pin profiles, namely, simple cylindrical, stepped cylindrica
Mat. Res.. Publicado em: 19/04/2018
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24. Lubricated Conditions Imposed on Coating Multi-layer on Wear Resistance Under Cr2O3 Effect
Lubricated pin-on-disk sliding wear tests were performed on applied to Al-0.1Mg-0.35Ni-Si Alloy by using the spray coating method has been investigated. Different loads were 5, 10, and 15 N at a sliding velocity, 1.32 m/s at room temperature and 60% relative humidity. The surfaces were analyzed by using X-ray diffraction the residual (XRD), energy dispersive
Mat. Res.. Publicado em: 16/04/2018