The Experts below are selected from a list of 3588 Experts worldwide ranked by ideXlab platform
Muhtar Qong - One of the best experts on this subject based on the ideXlab platform.
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A new scattering mechanism enhancement scheme for polarimetric SAR images
IEEE Transactions on Geoscience and Remote Sensing, 2002Co-Authors: Muhtar QongAbstract:A new scattering mechanism enhancement scheme has been developed for natural (distributed) targets based on the eigenvalues and corresponding eigenvectors of the covariance matrix in order to identify different scattering events. First, three new vectors (v/sub 1/, v/sub 2/, and v/sub 3/) were constructed from the eigenvectors of the covariance matrix with some modifications. Then, those modified vectors were weighted by the eigenvalues of the covariance matrix as a weighting function. Thus, three vertices (A, B, and C) could be obtained in the three-dimensional space. In order to utilize them equally, a triAngle (/spl Delta/ABC) was constructed by connecting these three vertices. The shape of the triAngle may be changed due to the different scattering mechanisms because the vertices are obtained from the combination of eigenvalues and eigenvectors. The result indicated that different scattering mechanisms can be represented by using an Exterior Angle derived from the interior Angles of the triAngle. Results obtained from the newly developed scattering enhancement scheme, when compared with the results derived from existing schemes, were in agreement in terms of the dominant scattering mechanisms, including surface scattering, double-bounce scattering, and volume scattering. The experimental results with the Spaceborne Imaging Radar version C (SIR-C) L-band full polarimetric data demonstrate the effectiveness of the new scattering enhancement scheme.
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IGARSS - A new scattering enhancement scheme for polarimetric SAR images based on covariance matrix
IEEE International Geoscience and Remote Sensing Symposium, 1Co-Authors: Muhtar QongAbstract:A new scattering mechanism enhancement scheme has been developed for natural targets based on the eigenvalues and eigenvectors of the covariance matrix in order to identify different scattering events. First, three new vectors were constructed by the eigenvectors of the covariance matrix with some modifications. Then, these modified vectors were weighted by the normalized eigenvalues of the covariance matrix as a weighting function. Thus, three vertices could be obtained in the three-dimensional space. In order to utilize them equally, a triAngle was constructed by connecting these three vertices. The shape of the triAngle may be changed due to the different scattering mechanisms because the vertices are obtained from the combination of eigenvalues and eigenvectors. The result indicated that different scattering mechanisms can be represented by using an Exterior Angle which derived from the interior Angles of the triAngle.
Jin Chen - One of the best experts on this subject based on the ideXlab platform.
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Research on the natural meshing mechanism and testing analysis of scroll profiles for refrigeration scroll compressor
Science China Technological Sciences, 2010Co-Authors: Licun Wang, Jin Chen, Yuanyang Zhao, Sinan H. HussainAbstract:In the design theory of scroll profiles for refrigeration scroll compressor, a mechanism principle of scroll profiles based on the center of natural temporal involutes and meshing region is presented, by which the performance characteristics of the various involutes are studied. Profiles type selection is very important for scroll compressor. Through analyzing the characteristic geometry, natural meshing mechanism is discovered in the study of scrolls. And a novel method for scroll profiles based on natural meshing mechanism is proposed. The result shows that the meshing region Angle of odd regular polygon involutes is half of the characteristic-geometry Exterior Angle, and that of even regular polygon involutes is equal to the Exterior Angle to the moment. The corresponding meshing region Angle is reduced increasingly with the increase of the edge number of characteristic geometry. The performance characteristics of scroll compressor tend towards the best correspondingly. Aiming at the existing problems of profile design for scrolls, we developed a novel methodology to study scroll profile. Originality research was done for the further study of scroll profile. It is the fundamentality factor representing essence character of scroll profiles function itself.
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Inherent engagement mechanism study of profile of scrolls
ICMIT 2005: Mechatronics MEMS and Smart Materials, 2005Co-Authors: Licun Wang, Jin ChenAbstract:Profiles type selection is very important for scroll compressor. Inherent engagement mechanism was discovered in the study of scrolls. And a novel method for scroll profiles based on inherent engagement mechanism is proposed. The result shows that the engagement region Angle (ERA) of odd regular polygon involutes is half of the characteristic-geometry Exterior Angle, and that of even regular polygon involutes is equal to the Exterior Angle to the moment. The corresponding ERA is reducing increasingly with the edge number increasing of characteristic geometry. The performance characteristics of scroll compressor tend towards the best correspondingly. Aiming at existed problems of profile design for scrolls, it developed a novel methodology to study scroll profile. Originality research was done for the further study of scroll profile. It is the fundamentality factor representing essence character of scroll profiles function itself.
Werner Rodejohann - One of the best experts on this subject based on the ideXlab platform.
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golden ratio prediction for solar neutrino mixing
New Journal of Physics, 2009Co-Authors: Adisorn Adulpravitchai, Alexander S Blum, Werner RodejohannAbstract:It has recently been speculated that the solar neutrino mixing Angle is connected to the golden ratio . Two such proposals have been made, cot θ12= and cos θ12=/2. We compare these ansatze and discuss a model leading to cos θ12=/2 based on the dihedral group D10. This symmetry is a natural candidate because the Angle in the expression cos θ12=/2 is simply π/5, or 36°. This is the Exterior Angle of a decagon and D10 is its rotational symmetry group. We also estimate radiative corrections to the golden ratio predictions.
Wang Hou - One of the best experts on this subject based on the ideXlab platform.
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Study of parameters in stability analysis of rock slope
Journal of Xi'an University of Architecture & Technology, 2010Co-Authors: Wang HouAbstract:In this paper,the relation between rock constitutive models is investigated.With the conversion of material parameters,the application of Equivalent Mohr-Coulomb Yield Criterion in Ansys is accomplished.By analyzing the example of rock slope with obvious slide surface,the viewpoint that using Equivalent Mohr-Coulomb Yield Criterion to replace Mohr-Coulomb Yield Criterion turns out to be feasible.Also,using Exterior Angle Point Circumscribed Cone Drucker-Prager Yield Criterion,Equivalent Mohr-Coulomb Yield Criterion and Limit Equilibrium Method in calculation,some instructive conclusions that have certain referential value to supporting structure designing and stability analysis of rock slope with obvious slide surface,are arrived at by the comparison of results,analysis of the parameter sensitivity to the changes of structure interface and rock slope stability.
Licun Wang - One of the best experts on this subject based on the ideXlab platform.
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Research on the natural meshing mechanism and testing analysis of scroll profiles for refrigeration scroll compressor
Science China Technological Sciences, 2010Co-Authors: Licun Wang, Jin Chen, Yuanyang Zhao, Sinan H. HussainAbstract:In the design theory of scroll profiles for refrigeration scroll compressor, a mechanism principle of scroll profiles based on the center of natural temporal involutes and meshing region is presented, by which the performance characteristics of the various involutes are studied. Profiles type selection is very important for scroll compressor. Through analyzing the characteristic geometry, natural meshing mechanism is discovered in the study of scrolls. And a novel method for scroll profiles based on natural meshing mechanism is proposed. The result shows that the meshing region Angle of odd regular polygon involutes is half of the characteristic-geometry Exterior Angle, and that of even regular polygon involutes is equal to the Exterior Angle to the moment. The corresponding meshing region Angle is reduced increasingly with the increase of the edge number of characteristic geometry. The performance characteristics of scroll compressor tend towards the best correspondingly. Aiming at the existing problems of profile design for scrolls, we developed a novel methodology to study scroll profile. Originality research was done for the further study of scroll profile. It is the fundamentality factor representing essence character of scroll profiles function itself.
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Inherent engagement mechanism study of profile of scrolls
ICMIT 2005: Mechatronics MEMS and Smart Materials, 2005Co-Authors: Licun Wang, Jin ChenAbstract:Profiles type selection is very important for scroll compressor. Inherent engagement mechanism was discovered in the study of scrolls. And a novel method for scroll profiles based on inherent engagement mechanism is proposed. The result shows that the engagement region Angle (ERA) of odd regular polygon involutes is half of the characteristic-geometry Exterior Angle, and that of even regular polygon involutes is equal to the Exterior Angle to the moment. The corresponding ERA is reducing increasingly with the edge number increasing of characteristic geometry. The performance characteristics of scroll compressor tend towards the best correspondingly. Aiming at existed problems of profile design for scrolls, it developed a novel methodology to study scroll profile. Originality research was done for the further study of scroll profile. It is the fundamentality factor representing essence character of scroll profiles function itself.
