The Experts below are selected from a list of 20214 Experts worldwide ranked by ideXlab platform
Julia Prince - One of the best experts on this subject based on the ideXlab platform.
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comprehending the thermal decomposition and Reconstruction Process of sol gel mgal layered double hydroxides
Journal of Physical Chemistry C, 2010Co-Authors: Jaime S Valente, Enrique Lima, J A Toledoantonio, M A Cortesjacome, L Lartundorojas, Ramon Montiel, Julia PrinceAbstract:The evolution of MgAl layered double hydroxides (LDHs), prepared by the sol−gel method, throughout the synthesis−crystallization−calcination−Reconstruction Process is thoroughly studied and compared to a coprecipitated analogue. X-ray diffraction and transmission electron microscopy provide useful information about crystallinity and morphology of the samples. It was found that crystal sizes do not necessarily decrease after calcination−Reconstruction. Furthermore, aluminum coordination is studied by 27Al MAS nuclear magnetic resonance and by X-ray photoelectron spectroscopy (XPS), revealing significant differences in the relative populations of tetrahedral aluminum in the surface and the bulk of the calcined sol−gel LDHs. Magnesium and oxygen structural environments are also studied by XPS. A possible correlation between crystal sizes of calcined LDHs and the amount of O2− surface species is discussed. Differences in the structural environment of magnesium in the as-synthesized and the reconstructed LDH a...
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Comprehending the Thermal Decomposition and Reconstruction Process of Sol−Gel MgAl Layered Double Hydroxides
Journal of Physical Chemistry C, 2010Co-Authors: Jaime S Valente, Enrique Lima, Ramon Montiel, J.a. Toledo-antonio, M.a. Cortés-jácome, Luis Lartundo-rojas, Julia PrinceAbstract:The evolution of MgAl layered double hydroxides (LDHs), prepared by the sol−gel method, throughout the synthesis−crystallization−calcination−Reconstruction Process is thoroughly studied and compared to a coprecipitated analogue. X-ray diffraction and transmission electron microscopy provide useful information about crystallinity and morphology of the samples. It was found that crystal sizes do not necessarily decrease after calcination−Reconstruction. Furthermore, aluminum coordination is studied by 27Al MAS nuclear magnetic resonance and by X-ray photoelectron spectroscopy (XPS), revealing significant differences in the relative populations of tetrahedral aluminum in the surface and the bulk of the calcined sol−gel LDHs. Magnesium and oxygen structural environments are also studied by XPS. A possible correlation between crystal sizes of calcined LDHs and the amount of O2− surface species is discussed. Differences in the structural environment of magnesium in the as-synthesized and the reconstructed LDH a...
Jaime S Valente - One of the best experts on this subject based on the ideXlab platform.
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comprehending the thermal decomposition and Reconstruction Process of sol gel mgal layered double hydroxides
Journal of Physical Chemistry C, 2010Co-Authors: Jaime S Valente, Enrique Lima, J A Toledoantonio, M A Cortesjacome, L Lartundorojas, Ramon Montiel, Julia PrinceAbstract:The evolution of MgAl layered double hydroxides (LDHs), prepared by the sol−gel method, throughout the synthesis−crystallization−calcination−Reconstruction Process is thoroughly studied and compared to a coprecipitated analogue. X-ray diffraction and transmission electron microscopy provide useful information about crystallinity and morphology of the samples. It was found that crystal sizes do not necessarily decrease after calcination−Reconstruction. Furthermore, aluminum coordination is studied by 27Al MAS nuclear magnetic resonance and by X-ray photoelectron spectroscopy (XPS), revealing significant differences in the relative populations of tetrahedral aluminum in the surface and the bulk of the calcined sol−gel LDHs. Magnesium and oxygen structural environments are also studied by XPS. A possible correlation between crystal sizes of calcined LDHs and the amount of O2− surface species is discussed. Differences in the structural environment of magnesium in the as-synthesized and the reconstructed LDH a...
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Comprehending the Thermal Decomposition and Reconstruction Process of Sol−Gel MgAl Layered Double Hydroxides
Journal of Physical Chemistry C, 2010Co-Authors: Jaime S Valente, Enrique Lima, Ramon Montiel, J.a. Toledo-antonio, M.a. Cortés-jácome, Luis Lartundo-rojas, Julia PrinceAbstract:The evolution of MgAl layered double hydroxides (LDHs), prepared by the sol−gel method, throughout the synthesis−crystallization−calcination−Reconstruction Process is thoroughly studied and compared to a coprecipitated analogue. X-ray diffraction and transmission electron microscopy provide useful information about crystallinity and morphology of the samples. It was found that crystal sizes do not necessarily decrease after calcination−Reconstruction. Furthermore, aluminum coordination is studied by 27Al MAS nuclear magnetic resonance and by X-ray photoelectron spectroscopy (XPS), revealing significant differences in the relative populations of tetrahedral aluminum in the surface and the bulk of the calcined sol−gel LDHs. Magnesium and oxygen structural environments are also studied by XPS. A possible correlation between crystal sizes of calcined LDHs and the amount of O2− surface species is discussed. Differences in the structural environment of magnesium in the as-synthesized and the reconstructed LDH a...
J Ruiz - One of the best experts on this subject based on the ideXlab platform.
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ICASSP - Connected operators based on Reconstruction Process for size and motion simplification
IEEE International Conference on Acoustics Speech and Signal Processing, 2002Co-Authors: Philippe Salembier, J RuizAbstract:This paper deals with connected operators based on Reconstruction Process. Connected operators are filtering tools that act on the connected components of the space where the image is constant, the so-called “flat zones”. Intuitively, connected operators can remove boundaries between flat zones but cannot add new boundaries nor shift existing contours. After reviewing the filtering strategy, new operators are proposed to perform size and motion simplification. In the case of size simplification, the proposed approach allows a better preservation the contrast of maxima or minima that have not been totally simplified by the filtering Process. In the case of motion simplification, two applications are presented: motion detection for maxima/minima and sequence simplification to improve the coding efficiency of standard encoders.
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Connected operators based on Reconstruction Process for size and motion simplification
ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings, 2002Co-Authors: Philippe Salembier, J RuizAbstract:This paper deals with connected operators based on Reconstruction Process. Connected operators are filtering tools that act on the connected components of the space where the image is constant, the so-called "flat zones". Intuitively, connected operators can remove boundaries between flat zones but cannot add new boundaries nor shift existing contours. After reviewing the filtering strategy, new operators are proposed to perform size and motion simplification. In the case of size simplification, the proposed approach allows a better preservation the contrast of maxima or minima that have not been totally simplified by the filtering Process. In the case of motion simplification, two applications are presented: motion detection for maxima/minima and sequence simplification to improve the coding efficiency of standard encoders.
Enrique Lima - One of the best experts on this subject based on the ideXlab platform.
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comprehending the thermal decomposition and Reconstruction Process of sol gel mgal layered double hydroxides
Journal of Physical Chemistry C, 2010Co-Authors: Jaime S Valente, Enrique Lima, J A Toledoantonio, M A Cortesjacome, L Lartundorojas, Ramon Montiel, Julia PrinceAbstract:The evolution of MgAl layered double hydroxides (LDHs), prepared by the sol−gel method, throughout the synthesis−crystallization−calcination−Reconstruction Process is thoroughly studied and compared to a coprecipitated analogue. X-ray diffraction and transmission electron microscopy provide useful information about crystallinity and morphology of the samples. It was found that crystal sizes do not necessarily decrease after calcination−Reconstruction. Furthermore, aluminum coordination is studied by 27Al MAS nuclear magnetic resonance and by X-ray photoelectron spectroscopy (XPS), revealing significant differences in the relative populations of tetrahedral aluminum in the surface and the bulk of the calcined sol−gel LDHs. Magnesium and oxygen structural environments are also studied by XPS. A possible correlation between crystal sizes of calcined LDHs and the amount of O2− surface species is discussed. Differences in the structural environment of magnesium in the as-synthesized and the reconstructed LDH a...
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Comprehending the Thermal Decomposition and Reconstruction Process of Sol−Gel MgAl Layered Double Hydroxides
Journal of Physical Chemistry C, 2010Co-Authors: Jaime S Valente, Enrique Lima, Ramon Montiel, J.a. Toledo-antonio, M.a. Cortés-jácome, Luis Lartundo-rojas, Julia PrinceAbstract:The evolution of MgAl layered double hydroxides (LDHs), prepared by the sol−gel method, throughout the synthesis−crystallization−calcination−Reconstruction Process is thoroughly studied and compared to a coprecipitated analogue. X-ray diffraction and transmission electron microscopy provide useful information about crystallinity and morphology of the samples. It was found that crystal sizes do not necessarily decrease after calcination−Reconstruction. Furthermore, aluminum coordination is studied by 27Al MAS nuclear magnetic resonance and by X-ray photoelectron spectroscopy (XPS), revealing significant differences in the relative populations of tetrahedral aluminum in the surface and the bulk of the calcined sol−gel LDHs. Magnesium and oxygen structural environments are also studied by XPS. A possible correlation between crystal sizes of calcined LDHs and the amount of O2− surface species is discussed. Differences in the structural environment of magnesium in the as-synthesized and the reconstructed LDH a...
Ramon Montiel - One of the best experts on this subject based on the ideXlab platform.
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comprehending the thermal decomposition and Reconstruction Process of sol gel mgal layered double hydroxides
Journal of Physical Chemistry C, 2010Co-Authors: Jaime S Valente, Enrique Lima, J A Toledoantonio, M A Cortesjacome, L Lartundorojas, Ramon Montiel, Julia PrinceAbstract:The evolution of MgAl layered double hydroxides (LDHs), prepared by the sol−gel method, throughout the synthesis−crystallization−calcination−Reconstruction Process is thoroughly studied and compared to a coprecipitated analogue. X-ray diffraction and transmission electron microscopy provide useful information about crystallinity and morphology of the samples. It was found that crystal sizes do not necessarily decrease after calcination−Reconstruction. Furthermore, aluminum coordination is studied by 27Al MAS nuclear magnetic resonance and by X-ray photoelectron spectroscopy (XPS), revealing significant differences in the relative populations of tetrahedral aluminum in the surface and the bulk of the calcined sol−gel LDHs. Magnesium and oxygen structural environments are also studied by XPS. A possible correlation between crystal sizes of calcined LDHs and the amount of O2− surface species is discussed. Differences in the structural environment of magnesium in the as-synthesized and the reconstructed LDH a...
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Comprehending the Thermal Decomposition and Reconstruction Process of Sol−Gel MgAl Layered Double Hydroxides
Journal of Physical Chemistry C, 2010Co-Authors: Jaime S Valente, Enrique Lima, Ramon Montiel, J.a. Toledo-antonio, M.a. Cortés-jácome, Luis Lartundo-rojas, Julia PrinceAbstract:The evolution of MgAl layered double hydroxides (LDHs), prepared by the sol−gel method, throughout the synthesis−crystallization−calcination−Reconstruction Process is thoroughly studied and compared to a coprecipitated analogue. X-ray diffraction and transmission electron microscopy provide useful information about crystallinity and morphology of the samples. It was found that crystal sizes do not necessarily decrease after calcination−Reconstruction. Furthermore, aluminum coordination is studied by 27Al MAS nuclear magnetic resonance and by X-ray photoelectron spectroscopy (XPS), revealing significant differences in the relative populations of tetrahedral aluminum in the surface and the bulk of the calcined sol−gel LDHs. Magnesium and oxygen structural environments are also studied by XPS. A possible correlation between crystal sizes of calcined LDHs and the amount of O2− surface species is discussed. Differences in the structural environment of magnesium in the as-synthesized and the reconstructed LDH a...
