The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform
J J Morcette - One of the best experts on this subject based on the ideXlab platform.
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second simulation of the Satellite Signal in the solar spectrum 6s an overview
IEEE Transactions on Geoscience and Remote Sensing, 1997Co-Authors: Eric F Vermote, D Tanre, M Herman, J L Deuze, J J MorcetteAbstract:Remote sensing from Satellite or airborne platforms of land or sea surfaces in the visible and near infrared is strongly affected by the presence of the atmosphere along the path from Sun to target (surface) to sensor. This paper presents 6S (Second Simulation of the Satellite Signal in the Solar Spectrum), a computer code which can accurately simulate the above problems. The 6S code is an improved version of 5S (Simulation of the Satellite Signal in the Solar Spectrum), developed by the Laboratoire d'Optique Atmospherique ten years ago. The new version now permits calculations of near-nadir (down-looking) aircraft observations, accounting for target elevation, non lambertian surface conditions, and new absorbing species (CH/sub 4/, N/sub 2/O, CO). The computational accuracy for Rayleigh and aerosol scattering effects has been improved by the use of state-of-the-art approximations and implementation of the successive order of scattering (SOS) algorithm. The step size (resolution) used for spectral integration has been improved to 2.5 nm. The goal of this paper is not to provide a complete description of the methods used as that information is detailed in the 6S manual, but rather to illustrate the impact of the improvements between 5S and 6S by examining some typical remote sensing situations. Nevertheless, the 6S code has still limitations. It cannot handle spherical atmosphere and as a result, it cannot be used for limb observations. In addition, the decoupling the authors are using for absorption and scattering effects does not allow to use the code in presence of strong absorption bands.
Takao Mizusaki - One of the best experts on this subject based on the ideXlab platform.
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Texture and Vortex of Rotating Superfluid 3He-A in Parallel-plate Geometry
Journal of Low Temperature Physics, 2010Co-Authors: Minoru Yamashita, Akira Matsubara, K. Izumina, Minoru Kubota, Osamu Ishikawa, Yutaka Sasaki, T. Takagi, Takao MizusakiAbstract:Unique types of textures and vortices of superfluid 3He in restricted geometries have been discussed. We investigated cw-NMR in rotating 3He A-phase in parallel plate geometries with gaps of 12.5 μm at 3.05 MPa. We observed a very sharp spectrum at rest which had shifted negatively as f=fL−0.93fA(T), where fA(T) is the full transverse dipole shift in A-phase. The large negative shift of 0.93fA(T) indicates that l⊥d. When we rotated the sample with rotation speed Ω faster than the critical ΩFr, a new Satellite Signal appeared nearly at fL. The Satellite Signal intensity increased with increasing Ω, reached a maximum at Ωc and slowly decreased up to the maximum Ω of 2π rad/s. When Ω decreased from the maximum speed, the Satellite Signal rapidly decreased and disappeared at 5.5 rad/s down to zero rad/s. We measured the temperature dependence of the Satellite Signal intensity, ΩFr and Ωc. We propose a model for the Satellite Signal, which is attributed to spin wave in Freedericksz transition region induced by the counter flow. We also compare the Satellite Signal with Kee and Maki’s bound pair of HQV.
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Texture and Vortex of Rotating Superfluid ^3He-A in Parallel-plate Geometry
Journal of Low Temperature Physics, 2009Co-Authors: Minoru Yamashita, Akira Matsubara, K. Izumina, Minoru Kubota, Osamu Ishikawa, Yutaka Sasaki, T. Takagi, Takao MizusakiAbstract:Unique types of textures and vortices of superfluid ^3He in restricted geometries have been discussed. We investigated cw-NMR in rotating ^3He A-phase in parallel plate geometries with gaps of 12.5 μm at 3.05 MPa. We observed a very sharp spectrum at rest which had shifted negatively as f = f _L−0.93 f _A( T ), where f _A( T ) is the full transverse dipole shift in A-phase. The large negative shift of 0.93 f _A( T ) indicates that l ⊥ d . When we rotated the sample with rotation speed Ω faster than the critical Ω _Fr, a new Satellite Signal appeared nearly at f _L. The Satellite Signal intensity increased with increasing Ω , reached a maximum at Ω _c and slowly decreased up to the maximum Ω of 2 π rad/s. When Ω decreased from the maximum speed, the Satellite Signal rapidly decreased and disappeared at 5.5 rad/s down to zero rad/s. We measured the temperature dependence of the Satellite Signal intensity, Ω _Fr and Ω _c. We propose a model for the Satellite Signal, which is attributed to spin wave in Fréedericksz transition region induced by the counter flow. We also compare the Satellite Signal with Kee and Maki’s bound pair of HQV.
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spin wave and vortex excitations of superfluid 3he a in parallel plate geometry
Physical Review Letters, 2008Co-Authors: Minoru Yamashita, Akira Matsubara, K. Izumina, O Ishikawa, Minoru Kubota, T. Takagi, Y Sasaki, Takao MizusakiAbstract:Quantized vortices with half-integer circulation, which are forbidden from existing in a conventional superfluid because of the single valueness of the wave function, are theoretically predicted to exist in superfluid $^{3}\mathrm{He}\mathrm{\text{\ensuremath{-}}}A$ if the order parameters $\stackrel{^}{\ensuremath{\ell}}$ and $\stackrel{^}{\mathbf{d}}$ form $\stackrel{^}{\ensuremath{\ell}}\ensuremath{\perp}\stackrel{^}{\mathbf{d}}$ texture. To form the $\stackrel{^}{\ensuremath{\ell}}\ensuremath{\perp}\stackrel{^}{\mathbf{d}}$ texture, we confined the superfluid between parallel plates with a $12.5\text{ }\text{ }\ensuremath{\mu}\mathrm{m}$ gap and applied a magnetic field of $H=26.7\text{ }\text{ }\mathrm{mT}$ perpendicular to the plates to take NMR and orient $\stackrel{^}{\mathbf{d}}$ perpendicular to $\stackrel{^}{\ensuremath{\ell}}$. NMR spectra exhibit a negative-shift peak which probes that the uniform $\stackrel{^}{\ensuremath{\ell}}\ensuremath{\perp}\stackrel{^}{\mathbf{d}}$ texture is realized in our cell and show a new Satellite Signal under rotation. The rotation dependence of the Satellite Signal is interpreted that a Fr\'eedericksz transition of $\stackrel{^}{\ensuremath{\ell}}$ texture is induced by rotation above $1.0\text{ }\text{ }\mathrm{rad}/\mathrm{s}$ and vortices start to appear above $1.8\text{ }\text{ }\mathrm{rad}/\mathrm{s}$.
Eric F Vermote - One of the best experts on this subject based on the ideXlab platform.
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second simulation of the Satellite Signal in the solar spectrum 6s an overview
IEEE Transactions on Geoscience and Remote Sensing, 1997Co-Authors: Eric F Vermote, D Tanre, M Herman, J L Deuze, J J MorcetteAbstract:Remote sensing from Satellite or airborne platforms of land or sea surfaces in the visible and near infrared is strongly affected by the presence of the atmosphere along the path from Sun to target (surface) to sensor. This paper presents 6S (Second Simulation of the Satellite Signal in the Solar Spectrum), a computer code which can accurately simulate the above problems. The 6S code is an improved version of 5S (Simulation of the Satellite Signal in the Solar Spectrum), developed by the Laboratoire d'Optique Atmospherique ten years ago. The new version now permits calculations of near-nadir (down-looking) aircraft observations, accounting for target elevation, non lambertian surface conditions, and new absorbing species (CH/sub 4/, N/sub 2/O, CO). The computational accuracy for Rayleigh and aerosol scattering effects has been improved by the use of state-of-the-art approximations and implementation of the successive order of scattering (SOS) algorithm. The step size (resolution) used for spectral integration has been improved to 2.5 nm. The goal of this paper is not to provide a complete description of the methods used as that information is detailed in the 6S manual, but rather to illustrate the impact of the improvements between 5S and 6S by examining some typical remote sensing situations. Nevertheless, the 6S code has still limitations. It cannot handle spherical atmosphere and as a result, it cannot be used for limb observations. In addition, the decoupling the authors are using for absorption and scattering effects does not allow to use the code in presence of strong absorption bands.
Yu Bao-guo - One of the best experts on this subject based on the ideXlab platform.
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Satellite Navigation Signal Simulation and Validation Platform Based on MATLAB Software
Computer Simulation, 2009Co-Authors: Yu Bao-guoAbstract:A software-based implementation approach for GPS/Galileo Satellite navigation Signal simulation and validation platform was proposed.The testbed's architecture was introduced.Main models and their functions of this platform were described detailedly.Their implementation methods were proposed,either.Simulation results and receiver position results show the availability of this GPS/Galileo Satellite Signal simulation and validation platform which is based on MATLAB software.
Minoru Yamashita - One of the best experts on this subject based on the ideXlab platform.
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Texture and Vortex of Rotating Superfluid 3He-A in Parallel-plate Geometry
Journal of Low Temperature Physics, 2010Co-Authors: Minoru Yamashita, Akira Matsubara, K. Izumina, Minoru Kubota, Osamu Ishikawa, Yutaka Sasaki, T. Takagi, Takao MizusakiAbstract:Unique types of textures and vortices of superfluid 3He in restricted geometries have been discussed. We investigated cw-NMR in rotating 3He A-phase in parallel plate geometries with gaps of 12.5 μm at 3.05 MPa. We observed a very sharp spectrum at rest which had shifted negatively as f=fL−0.93fA(T), where fA(T) is the full transverse dipole shift in A-phase. The large negative shift of 0.93fA(T) indicates that l⊥d. When we rotated the sample with rotation speed Ω faster than the critical ΩFr, a new Satellite Signal appeared nearly at fL. The Satellite Signal intensity increased with increasing Ω, reached a maximum at Ωc and slowly decreased up to the maximum Ω of 2π rad/s. When Ω decreased from the maximum speed, the Satellite Signal rapidly decreased and disappeared at 5.5 rad/s down to zero rad/s. We measured the temperature dependence of the Satellite Signal intensity, ΩFr and Ωc. We propose a model for the Satellite Signal, which is attributed to spin wave in Freedericksz transition region induced by the counter flow. We also compare the Satellite Signal with Kee and Maki’s bound pair of HQV.
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Texture and Vortex of Rotating Superfluid ^3He-A in Parallel-plate Geometry
Journal of Low Temperature Physics, 2009Co-Authors: Minoru Yamashita, Akira Matsubara, K. Izumina, Minoru Kubota, Osamu Ishikawa, Yutaka Sasaki, T. Takagi, Takao MizusakiAbstract:Unique types of textures and vortices of superfluid ^3He in restricted geometries have been discussed. We investigated cw-NMR in rotating ^3He A-phase in parallel plate geometries with gaps of 12.5 μm at 3.05 MPa. We observed a very sharp spectrum at rest which had shifted negatively as f = f _L−0.93 f _A( T ), where f _A( T ) is the full transverse dipole shift in A-phase. The large negative shift of 0.93 f _A( T ) indicates that l ⊥ d . When we rotated the sample with rotation speed Ω faster than the critical Ω _Fr, a new Satellite Signal appeared nearly at f _L. The Satellite Signal intensity increased with increasing Ω , reached a maximum at Ω _c and slowly decreased up to the maximum Ω of 2 π rad/s. When Ω decreased from the maximum speed, the Satellite Signal rapidly decreased and disappeared at 5.5 rad/s down to zero rad/s. We measured the temperature dependence of the Satellite Signal intensity, Ω _Fr and Ω _c. We propose a model for the Satellite Signal, which is attributed to spin wave in Fréedericksz transition region induced by the counter flow. We also compare the Satellite Signal with Kee and Maki’s bound pair of HQV.
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spin wave and vortex excitations of superfluid 3he a in parallel plate geometry
Physical Review Letters, 2008Co-Authors: Minoru Yamashita, Akira Matsubara, K. Izumina, O Ishikawa, Minoru Kubota, T. Takagi, Y Sasaki, Takao MizusakiAbstract:Quantized vortices with half-integer circulation, which are forbidden from existing in a conventional superfluid because of the single valueness of the wave function, are theoretically predicted to exist in superfluid $^{3}\mathrm{He}\mathrm{\text{\ensuremath{-}}}A$ if the order parameters $\stackrel{^}{\ensuremath{\ell}}$ and $\stackrel{^}{\mathbf{d}}$ form $\stackrel{^}{\ensuremath{\ell}}\ensuremath{\perp}\stackrel{^}{\mathbf{d}}$ texture. To form the $\stackrel{^}{\ensuremath{\ell}}\ensuremath{\perp}\stackrel{^}{\mathbf{d}}$ texture, we confined the superfluid between parallel plates with a $12.5\text{ }\text{ }\ensuremath{\mu}\mathrm{m}$ gap and applied a magnetic field of $H=26.7\text{ }\text{ }\mathrm{mT}$ perpendicular to the plates to take NMR and orient $\stackrel{^}{\mathbf{d}}$ perpendicular to $\stackrel{^}{\ensuremath{\ell}}$. NMR spectra exhibit a negative-shift peak which probes that the uniform $\stackrel{^}{\ensuremath{\ell}}\ensuremath{\perp}\stackrel{^}{\mathbf{d}}$ texture is realized in our cell and show a new Satellite Signal under rotation. The rotation dependence of the Satellite Signal is interpreted that a Fr\'eedericksz transition of $\stackrel{^}{\ensuremath{\ell}}$ texture is induced by rotation above $1.0\text{ }\text{ }\mathrm{rad}/\mathrm{s}$ and vortices start to appear above $1.8\text{ }\text{ }\mathrm{rad}/\mathrm{s}$.
