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| Author(s): |
Antonio Marchi Netto
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | São Carlos. |
| Institution: | Universidade de São Paulo (USP). Instituto de Física de São Carlos (IFSC/BT) |
| Defense date: | 2009-09-17 |
| Examining board members: |
Luiz Alberto Colnago;
Tito Jose Bonagamba;
Jose Daniel Figueroa Villar
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| Advisor: | Luiz Alberto Colnago |
| Abstract | |
The NMR-CWFP pulse sequence (Nuclear Magnetic Resonance - Continuous Wave Free Precession) has met several applications in the science. The present work analyses the high sensibility of this sequence to its spectral parameters variation, exclusively in a theoretical and experimental characterization of the flow NMR-CWFP of the kind plug-flow, exemplified by online measures by seeds transport through a mat under a magnetic field constant in time. Simulations and measurements were made on several conditions, varying the factors that have measurement influence, like flip angle (??, offset angle (??, time between pulses (Tp), gradient (G), velocity (v) and longitudinal and transversal relaxation times (T1 and T2). Under certain conditions of flip angle, precession, time between pulses, gradient and velocity, it was noticed that there might be a null point with T1 and T2 dependence. This phenomenon was studied and some applications have been suggested. The work has also validated the CWFP pulse sequence as a quantitative tool to quantitative analysis of seeds oil mass. (AU) | |
| FAPESP's process: | 07/06119-9 - Analysis of the influence of CWFP-NMR spectral parameter in quantitative measurements |
| Grantee: | Antonio Marchi Netto |
| Support Opportunities: | Scholarships in Brazil - Master |