The Experts below are selected from a list of 222 Experts worldwide ranked by ideXlab platform
M Tagviashvili - One of the best experts on this subject based on the ideXlab platform.
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e 0 limits in the mie Scattering theory
Physical Review A, 2010Co-Authors: M TagviashviliAbstract:The classical Mie theory for electromagnetic Radiation Scattering by homogeneous spherical particles is considered in the dielectric constant ($\ensuremath{\epsilon}$) $\ensuremath{\rightarrow}0$ limit separately for the materials of the particles and the surrounding medium. The maxima of a scattered transverse electrical (TE) field for the surrounding medium materials with $\ensuremath{\epsilon}\ensuremath{\rightarrow}0$ limits are investigated. The effective multipole polarizabilities of the corresponding Scattering particles are investigated. The possibility of achieving magnetic dipole resonance and accordingly of constructing metamaterials with negative refractive index for aggregates of spherical particles in the surrounding medium with the dielectric constant near zero is demonstrated.
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e 0 limits in the mie Scattering theory
Physical Review A, 2010Co-Authors: M TagviashviliAbstract:The classical Mie theory for electromagnetic Radiation Scattering by homogeneous spherical particles is considered in the dielectric constant ($\ensuremath{\epsilon}$) $\ensuremath{\rightarrow}0$ limit separately for the materials of the particles and the surrounding medium. The maxima of a scattered transverse electrical (TE) field for the surrounding medium materials with $\ensuremath{\epsilon}\ensuremath{\rightarrow}0$ limits are investigated. The effective multipole polarizabilities of the corresponding Scattering particles are investigated. The possibility of achieving magnetic dipole resonance and accordingly of constructing metamaterials with negative refractive index for aggregates of spherical particles in the surrounding medium with the dielectric constant near zero is demonstrated.
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epsilon yields 0 limits in the mie Scattering theory
Physical Review A, 2010Co-Authors: M TagviashviliAbstract:The classical Mie theory for electromagnetic Radiation Scattering by homogeneous spherical particles is considered in the dielectric constant ({epsilon}) {yields}0 limit separately for the materials of the particles and the surrounding medium. The maxima of a scattered transverse electrical (TE) field for the surrounding medium materials with {epsilon}{yields}0 limits are investigated. The effective multipole polarizabilities of the corresponding Scattering particles are investigated. The possibility of achieving magnetic dipole resonance and accordingly of constructing metamaterials with negative refractive index for aggregates of spherical particles in the surrounding medium with the dielectric constant near zero is demonstrated.
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epsilons near zero limits in the mie Scattering theory
Physical Review A, 2009Co-Authors: M TagviashviliAbstract:The classical Mie theory - electromagnetic Radiation Scattering by the homogeneous spherical particles - is considered in the epsilon near zero limits separately for the materials of the particles and the surrounding medium. The maxima of a scattered transverse electrical (TE) field for the surrounding medium materials with the epsilon near zero limits are revealed. The effective multipole polarizabilities of the corresponding Scattering particles are investigated. The possibility to achieve magnetic dipole resonance and accordingly to construct metamaterials with negative refractive index for the aggregates spherical particles in surrounding medium with the epsilon near zero limits is considered.
Hsitseng Chou - One of the best experts on this subject based on the ideXlab platform.
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efficient analysis of phased arrays of microstrip patches using a hybrid generalized forward backward method green s function technique with a dft based acceleration algorithm
IEEE Transactions on Antennas and Propagation, 2008Co-Authors: O Bakir, V B Erturk, Ozlem Aydin Civi, Hsitseng ChouAbstract:A hybrid method based on the combination of generalized forward backward method (GFBM) and Green's function for the grounded dielectric slab together with the acceleration of the combination via a discrete Fourier transform (DFT) based algorithm is developed for the efficient and accurate analysis of electromagnetic Radiation/Scattering from electrically large, irregularly contoured two-dimensional arrays consisting of finite number of probe-fed microstrip patches. In this method, unknown current coefficients corresponding to a single patch are first solved by a conventional Galerkin type hybrid method of moments (MoM)/Green's function technique that uses the grounded dielectric slab's Green's function. Because the current distribution on the microstrip patch can be expanded using an arbitrary number of subsectional basis functions, the patch can have any shape. The solution for the array currents is then found through GFBM, where it sweeps the current computation element by element. The computational complexity of this method, which is originally ( being the total number of unknowns) for each iteration, is reduced to using a DFT based acceleration algorithm making use of the fact that array elements are identical and the array is periodic. Numerical results in the form of array current distribution are given for various sized arrays of probe-fed microstrip patches with elliptical and/or circular boundaries, and are compared with the conventional MoM results to illustrate the efficiency and accuracy of the method.
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extension of forward backward method with dft based acceleration algorithm for the efficient analysis of large periodic arrays with arbitrary boundaries
Microwave and Optical Technology Letters, 2005Co-Authors: Ozlem Aydin Civi, V B Erturk, Hsitseng ChouAbstract:An extension of the discrete Fourier transform (DFT)-based forward-backward algorithm is developed using the virtual-element approach to provide a fast and accurate analysis of electromagnetic Radiation/Scattering from electrically large, planar, periodic, finite (phased) arrays with arbitrary boundaries. Both the computational complexity and storage requirements of this approach are O(Ntot) (Ntot is the total number of unknowns). The numerical results for both printed and freestanding dipole arrays with circular and/or elliptical boundaries are presented to validate the efficiency and accuracy of this approach. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 47: 293–298, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21150
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extension of forward backward method with dft based acceleration algorithm for the efficient analysis of large periodic arrays with arbitrary boundaries
IEEE Antennas and Propagation Society International Symposium, 2003Co-Authors: Ozlem Aydin Civi, Hsitseng Chou, V B ErturkAbstract:In this paper, an extension of forward-backward with DFT based acceleration approach is presented to provide a relatively efficient analysis of EM Radiation/Scattering from an electrically large, planar, periodic, finite arrays with arbitrary boundaries, such as arrays with circular or elliptical boundaries.
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a hybrid uniform geometrical theory of diffraction moment method for efficient analysis of electromagnetic Radiation Scattering from large finite planar arrays
Radio Science, 2000Co-Authors: Aydin O Civi, P H Pathak, Hsitseng Chou, P NepaAbstract:A hybrid uniform geometrical theory of diffraction (UTD)-moment method (MOM) approach is introduced to provide an efficient analysis of the electromagnetic Radiation/Scattering from electrically large, finite, planar periodic arrays. This study is motivated by the fact that conventional numerical methods become rapidly inefficient and even intractable for the analysis of electrically large arrays containing many antenna or frequency-selective surface (FSS) elements. In the present hybrid UTD-MOM approach, the number of unknowns to be solved is drastically reduced as compared to that which is required in the conventional MOM approach. This substantial reduction in the MOM unknowns is essentially made possible by introducing relatively few, special ray-type (or UTD) basis functions to efficiently describe the unknown array currents. The utility of the present hybrid approach is demonstrated here for the simple case of a large rectangular phased array of short and thin metallic dipoles in air, which are excited with a uniform amplitude and linear phase distribution. Some numerical results are presented to illustrate the efficiency and accuracy of this hybrid method.
François Boué - One of the best experts on this subject based on the ideXlab platform.
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Monitoring food structure during digestion using small-angle Scattering and imaging techniques
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2019Co-Authors: Jade Pasquier, Annie Brûlet, Adeline Boire, Frédéric Jamme, Javier Pérez, Thomas Bizien, Evelyne Lutton, François BouéAbstract:Various studies have shown that food structure has an impact on digestion kinetics. We focus here on the effects of gastric and intestinal enzymes (in-vitro digestion) on two canola seed storage proteins, napin and cruciferin. To monitor structure effect we conducted experiments on gels of these proteins at different pHs, yielding different structures and elastic modulus. What is new is to get information on the mechanisms at the lowest scales, using imaging and Radiation Scattering at large facilities: Synchrotron fluorescence microscopy, X-Ray Scattering, at SOLEIL synchrotron, and Small-Angle Neutron Scattering, at Laboratoire Léon Brillouin reactor. We can identify the mechanisms at each step and in two distinct scale ranges, observed simultaneously, the one of the individual protein scale and the one of the structure connectivity:-during gelation individual canola proteins are not deeply modified in comparison with their state in solution ; larger scale gel heterogeneity appears due to connectivity or aggregation-in the gastric step (up to 40 min): o at short scale (large q) we see that the proteins disintegration is much slowed down in gels than in solutions, particularly in the gastric phase; o at larger scales (low q), we see that the gel structure is also self-resistant to the action of the enzyme (pepsin).-in the intestinal step, such kinetics differences hold until major disintegration after no more than 15 min.
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Monitoring food structure during digestion using small-angle Scattering and imaging techniques
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2019Co-Authors: Jade Pasquier, Annie Brûlet, Adeline Boire, Frédéric Jamme, Javier Pérez, Thomas Bizien, Evelyne Lutton, François BouéAbstract:Abstract Various studies have shown that food structure has an impact on digestion kinetics. We focus here on the effects of gastric and intestinal enzymes (in-vitro digestion) on two canola seed storage proteins, napin and cruciferin. To monitor structure effect we conducted experiments on gels of these proteins at different pHs, yielding different structures and elastic modulus. What is new is to get information on the mechanisms at the lowest scales, using imaging and Radiation Scattering at large facilities: Synchrotron fluorescence microscopy, X-Ray Scattering, at SOLEIL synchrotron, and Small-Angle Neutron Scattering, at Laboratoire Leon Brillouin reactor. We can identify the mechanisms at each step and in two distinct scale ranges, observed simultaneously, the one of the individual protein scale and the one of the structure connectivity: • during gelation individual canola proteins are not deeply modified in comparison with their state in solution ; larger scale gel heterogeneity appears due to connectivity or aggregation • in the gastric step (up to 40 min): ○ at short scale (large q) we see that the proteins disintegration is much slowed down in gels than in solutions, particularly in the gastric phase; ○ at larger scales (low q), we see that the gel structure is also self-resistant to the action of the enzyme (pepsin). • in the intestinal step, such kinetics differences hold until major disintegration after no more than 15 min.
V B Erturk - One of the best experts on this subject based on the ideXlab platform.
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efficient analysis of phased arrays of microstrip patches using a hybrid generalized forward backward method green s function technique with a dft based acceleration algorithm
IEEE Transactions on Antennas and Propagation, 2008Co-Authors: O Bakir, V B Erturk, Ozlem Aydin Civi, Hsitseng ChouAbstract:A hybrid method based on the combination of generalized forward backward method (GFBM) and Green's function for the grounded dielectric slab together with the acceleration of the combination via a discrete Fourier transform (DFT) based algorithm is developed for the efficient and accurate analysis of electromagnetic Radiation/Scattering from electrically large, irregularly contoured two-dimensional arrays consisting of finite number of probe-fed microstrip patches. In this method, unknown current coefficients corresponding to a single patch are first solved by a conventional Galerkin type hybrid method of moments (MoM)/Green's function technique that uses the grounded dielectric slab's Green's function. Because the current distribution on the microstrip patch can be expanded using an arbitrary number of subsectional basis functions, the patch can have any shape. The solution for the array currents is then found through GFBM, where it sweeps the current computation element by element. The computational complexity of this method, which is originally ( being the total number of unknowns) for each iteration, is reduced to using a DFT based acceleration algorithm making use of the fact that array elements are identical and the array is periodic. Numerical results in the form of array current distribution are given for various sized arrays of probe-fed microstrip patches with elliptical and/or circular boundaries, and are compared with the conventional MoM results to illustrate the efficiency and accuracy of the method.
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extension of forward backward method with dft based acceleration algorithm for the efficient analysis of large periodic arrays with arbitrary boundaries
Microwave and Optical Technology Letters, 2005Co-Authors: Ozlem Aydin Civi, V B Erturk, Hsitseng ChouAbstract:An extension of the discrete Fourier transform (DFT)-based forward-backward algorithm is developed using the virtual-element approach to provide a fast and accurate analysis of electromagnetic Radiation/Scattering from electrically large, planar, periodic, finite (phased) arrays with arbitrary boundaries. Both the computational complexity and storage requirements of this approach are O(Ntot) (Ntot is the total number of unknowns). The numerical results for both printed and freestanding dipole arrays with circular and/or elliptical boundaries are presented to validate the efficiency and accuracy of this approach. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 47: 293–298, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21150
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extension of forward backward method with dft based acceleration algorithm for the efficient analysis of large periodic arrays with arbitrary boundaries
IEEE Antennas and Propagation Society International Symposium, 2003Co-Authors: Ozlem Aydin Civi, Hsitseng Chou, V B ErturkAbstract:In this paper, an extension of forward-backward with DFT based acceleration approach is presented to provide a relatively efficient analysis of EM Radiation/Scattering from an electrically large, planar, periodic, finite arrays with arbitrary boundaries, such as arrays with circular or elliptical boundaries.
Jade Pasquier - One of the best experts on this subject based on the ideXlab platform.
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Monitoring food structure during digestion using small-angle Scattering and imaging techniques
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2019Co-Authors: Jade Pasquier, Annie Brûlet, Adeline Boire, Frédéric Jamme, Javier Pérez, Thomas Bizien, Evelyne Lutton, François BouéAbstract:Various studies have shown that food structure has an impact on digestion kinetics. We focus here on the effects of gastric and intestinal enzymes (in-vitro digestion) on two canola seed storage proteins, napin and cruciferin. To monitor structure effect we conducted experiments on gels of these proteins at different pHs, yielding different structures and elastic modulus. What is new is to get information on the mechanisms at the lowest scales, using imaging and Radiation Scattering at large facilities: Synchrotron fluorescence microscopy, X-Ray Scattering, at SOLEIL synchrotron, and Small-Angle Neutron Scattering, at Laboratoire Léon Brillouin reactor. We can identify the mechanisms at each step and in two distinct scale ranges, observed simultaneously, the one of the individual protein scale and the one of the structure connectivity:-during gelation individual canola proteins are not deeply modified in comparison with their state in solution ; larger scale gel heterogeneity appears due to connectivity or aggregation-in the gastric step (up to 40 min): o at short scale (large q) we see that the proteins disintegration is much slowed down in gels than in solutions, particularly in the gastric phase; o at larger scales (low q), we see that the gel structure is also self-resistant to the action of the enzyme (pepsin).-in the intestinal step, such kinetics differences hold until major disintegration after no more than 15 min.
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Monitoring food structure during digestion using small-angle Scattering and imaging techniques
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2019Co-Authors: Jade Pasquier, Annie Brûlet, Adeline Boire, Frédéric Jamme, Javier Pérez, Thomas Bizien, Evelyne Lutton, François BouéAbstract:Abstract Various studies have shown that food structure has an impact on digestion kinetics. We focus here on the effects of gastric and intestinal enzymes (in-vitro digestion) on two canola seed storage proteins, napin and cruciferin. To monitor structure effect we conducted experiments on gels of these proteins at different pHs, yielding different structures and elastic modulus. What is new is to get information on the mechanisms at the lowest scales, using imaging and Radiation Scattering at large facilities: Synchrotron fluorescence microscopy, X-Ray Scattering, at SOLEIL synchrotron, and Small-Angle Neutron Scattering, at Laboratoire Leon Brillouin reactor. We can identify the mechanisms at each step and in two distinct scale ranges, observed simultaneously, the one of the individual protein scale and the one of the structure connectivity: • during gelation individual canola proteins are not deeply modified in comparison with their state in solution ; larger scale gel heterogeneity appears due to connectivity or aggregation • in the gastric step (up to 40 min): ○ at short scale (large q) we see that the proteins disintegration is much slowed down in gels than in solutions, particularly in the gastric phase; ○ at larger scales (low q), we see that the gel structure is also self-resistant to the action of the enzyme (pepsin). • in the intestinal step, such kinetics differences hold until major disintegration after no more than 15 min.
