The Experts below are selected from a list of 315 Experts worldwide ranked by ideXlab platform
Lyndon Emsley - One of the best experts on this subject based on the ideXlab platform.
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spectral editing in solid state nmr using Scalar Multiple quantum filters
Journal of Magnetic Resonance, 2001Co-Authors: Dimitris Sakellariou, Anne Lesage, Lyndon EmsleyAbstract:In this paper we describe the use of heteronuclear Scalar couplings in solid-state NMR in order to generate Multiple-quantum filtering (MQF) pulse sequences. These sequences can be used to edit CP/MAS spectra according to carbon multiplicity. Analytic expressions for the intensity of the MQF signals are obtained using the standard product operator formalism. Experiments that demonstrate the technique are shown in powder samples of camphor and a tripeptide.
P Leelapornchai - One of the best experts on this subject based on the ideXlab platform.
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optimization of the index assignments for Multiple description vector quantizers
IEEE Transactions on Communications, 2003Co-Authors: N Gortz, P LeelapornchaiAbstract:The optimization criterion and a practically feasible new algorithm is stated for the optimization of the index assignments of a Multiple-description unconstrained vector quantizer with an arbitrary number of descriptions. In the simulations, the index-optimized Multiple-description vector quantizer achieves significant gains in source signal-to-noise ratio over Scalar Multiple description schemes.
Willem Bastiaan Kleijn - One of the best experts on this subject based on the ideXlab platform.
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ICASSP - Adaptive resolution-constrained Scalar Multiple-description coding
2008 IEEE International Conference on Acoustics Speech and Signal Processing, 2008Co-Authors: Janusz Klejsa, Marcin Kuropatwinski, Willem Bastiaan KleijnAbstract:We consider adaptive two-channel Multiple-description coding. We provide an analytical method for designing a resolution- constrained symmetrical Multiple-description coder that uses an index assignment matrix. We use existing index assignment algorithms that are known for their good properties within our adaptive Multiple-description coding architecture. These existing index assignment algorithms are parameterized and the coefficient of quantization of the side coders is described by a rational function. This leads to an analytical solution for the design problem, facilitating real-time adaptation based on information provided by feedback channels or rate conditions imposed by network management. Our experimental results show that the practical performance closely approximates theoretically obtained optimal behavior.
Dominique Massiot - One of the best experts on this subject based on the ideXlab platform.
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Accurate Heteronuclear J-Coupling Measurements in Dilute Spin Systems using the Multiple-quantum filtered J-resolved experiment
Chemical Communications, 2007Co-Authors: Charlotte Martineau, Jean-yves Buzaré, Gilles Silly, Franck Fayon, Christophe Legein, Dominique MassiotAbstract:19F-207Pb J-coupling constants, 10 even though these couplings are not visible on high speed 19F 1D MAS spectra. In particular, we demonstrate that the J-resolved experiment combined with Scalar Multiple-quantum filtering considerably improves the resolution of J-Multiplet patterns for dilute spin systems.
Dimitris Sakellariou - One of the best experts on this subject based on the ideXlab platform.
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spectral editing in solid state nmr using Scalar Multiple quantum filters
Journal of Magnetic Resonance, 2001Co-Authors: Dimitris Sakellariou, Anne Lesage, Lyndon EmsleyAbstract:In this paper we describe the use of heteronuclear Scalar couplings in solid-state NMR in order to generate Multiple-quantum filtering (MQF) pulse sequences. These sequences can be used to edit CP/MAS spectra according to carbon multiplicity. Analytic expressions for the intensity of the MQF signals are obtained using the standard product operator formalism. Experiments that demonstrate the technique are shown in powder samples of camphor and a tripeptide.
