957 resultados para echo chaining
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Soitinnus: orkesteri.
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Digitoitu 2. 7. 2008.
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Digitoitu 2. 7. 2008.
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Digitoitu 2. 7. 2008.
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Soitinnus: piano.
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Digitoitu 2. 7. 2008.
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Soitinnus: orkesteri.
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To choose among the variety of oleaginous plants for biodiesel production, the oil content of several matrices was determined through different low-field ¹H nuclear magnetic resonance (NMR) experiments with varied pulse sequences, namely single-pulse, spin-echo, CPMG, and CWFP. The experiments that involved the first three sequences showed high correlation with each other and with the solvent extraction method. The quality of the vegetable oils was also evaluated on the basis of the existing correlation between the T2 values of the oils and their properties, such as viscosity, iodine index, and cetane index. These analyses were performed using HCA and PCA chemometric tools. The results were sufficiently significant to allow separation of the oleaginous matrices according to their quality. Thus, the low-field ¹H NMR technique was confirmed as an important tool to aid in the selection of oleaginous matrices for biodiesel production.
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The aim of this paper was to present a simple and fast way of simulating Nuclear Magnetic Resonance signals using the Bloch equations. These phenomenological equations describe the classical behavior of macroscopic magnetization and are easily simulated using rotation matrices. Many NMR pulse sequences can be simulated with this formalism, allowing a quantitative description of the influence of many experimental parameters. Finally, the paper presents simulations of conventional sequences such as Single Pulse, Inversion Recovery, Spin Echo and CPMG.
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Soitinnus: orkesteri.
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Soitinnus: lauluäänet (sopraano, tenori), orkesteri.
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Soitinnus: lauluäänet (sopraano, tenori), orkesteri.
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Soitinnus: lauluääni (sopraano), orkesteri.
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Soitinnus: lauluääni (sopraano), orkesteri.
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Soitinnus: naiskuoro, jouset, piano.