Browsing by Author "Roque, A."
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- Fast-Field Cycling Nuclear Magnetic Resonance relaxometer's electromagnet with optimized homogeneity and reduced volumePublication . Videira, P.; Sebastião, P.; Roque, A.; Sousa, D. M.; Margato, ElmanoIn this article a Fast Field Cycling (FFC) Nuclear Magnetic Resonance (NMR) electromagnet with low power consumption (less than 200 W), high field homogeneity and reduced volume is projected and described. The electromagnet is iron and copper based, possessing a high permeability and allowing for good magnetic field homogeneity in the operating range of 0 to 0.33 T. With this solution, it is possible to increase 65% the maximum magnetic field keeping the magnetic field homogeneity in comparison with former similar FFC relaxometers. Electromagnet's experimental and simulation results evaluating the generated magnetic field, field homogeneity, heating effects and cooling requirements are also presented. In addition, some technical aspects of the required coupled systems such as the cooling, sample heating are assessed.
- Measuring the efficiency of an industrial condition monitoring servicePublication . Sobral, José; Roque, A.The mode how industrial physical assets are maintained is very importante to assure high equipment availability. I tis importante to find a metric or a key indicator that will point out the effectiveness of such function. Once condition based maintenance is widely assumed to be one of the most importante maintenance strategies, it is fundamental to observe how assets are being monitored. The purpose of this pape is to observe the performance of the condition monitoring service within all maintenance activities. With this goal it is possible to determine the efficiency of this service and identify the gaps regarding the maximum achievable efficiency. The methodology or approach used called Overall Service Efficiency (OSE) refers to the Organization of the condition monitoring service, the Competencies and abilities of human resources affected to the service and the Interface between condition monitoring and other services inside the organization.
- Temperature distribution of a Fast-Field Cycling Nuclear Magnetic Resonance relaxometer's electromagnet with reduced volumePublication . Videira, P.; Sebastião, P.; Roque, A.; Sousa, D. M.; Fernandes, A.; Margato, ElmanoThe temperature distribution of a Fast Field Cycling (FFC) Nuclear Magnetic Resonance (NMR) electromagnet plays an important role in the operation of this type of apparatus. The designed electromagnet presents a reduced volume and is iron and copper based, fulfilling the technical requirements for the magnetic field. With this solution, it is possible to increase the overall performance in comparison with former similar FFC relaxometers. Electromagnet's simulation results evaluating the temperature distribution, heating effects and cooling requirements are presented.