The Experts below are selected from a list of 55968 Experts worldwide ranked by ideXlab platform
Nagi N Mansour - One of the best experts on this subject based on the ideXlab platform.
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mechanism of Spontaneous Formation of stable magnetic structures on the sun
The Astrophysical Journal, 2010Co-Authors: I N Kitiashvili, Albert A WRAY, Alexander G. Kosovichev, Nagi N MansourAbstract:One of the puzzling features of solar magnetism is Formation of long-living compact magnetic structures, such as sunspots and pores, in the highly turbulent upper layer of the solar convective zone. We use realistic radiative three-dimensional MHD simulations to investigate the interaction between magnetic field and turbulent convection. In the simulations, a weak vertical uniform magnetic field is imposed in a region of fully developed granular convection, and the total magnetic flux through the top and bottom boundaries is kept constant. The simulation results reveal a process of Spontaneous Formation of stable magnetic structures, which may be a key to understanding the magnetic self-organization on the Sun and Formation of pores and sunspots. This process consists of two basic steps: (1) Formation of small-scale filamentary magnetic structures associated with concentrations of vorticity and whirlpool-type motions, and (2) merging of these structures due to the vortex attraction, caused by converging downdrafts around magnetic concentration below the surface. In the resulting large-scale structure maintained by the converging plasma motions, the magnetic field strength reaches ~1.5 kG at the surface and ~6 kG in the interior, and the surface structure resembles solar pores. The magnetic structure remains stable for the whole simulation run of several hours with no sign of decay.
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Mechanism of Spontaneous Formation of stable magnetic structures on the Sun
The Astrophysical Journal, 2010Co-Authors: I N Kitiashvili, Albert A WRAY, Alexander G. Kosovichev, Nagi N MansourAbstract:One of the puzzling features of solar magnetism is Formation of long-living compact magnetic structures; such as sunspots and pores, in the highly turbulent upper layer of the solar convective zone. We use realistic radiative 3D MHD simulations to investigate the interaction between magnetic field and turbulent convection. In the simulations, a weak vertical uniform magnetic field is imposed in a region of fully developed granular convection; and the total magnetic flux through the top and bottom boundaries is kept constant. The simulation results reveal a process of Spontaneous Formation of stable magnetic structures, which may be a key to understanding of the magnetic self-organization on the Sun and Formation of pores and sunspots. This process consists of two basic steps: 1) Formation of small-scale filamentary magnetic structures associated with concentrations of vorticity and whirlpool-type motions, and 2) merging of these structures due to the vortex attraction, caused by converging downdrafts around magnetic concentration below the surface. In the resulting large-scale structure maintained by the converging plasma motions, the magnetic field strength reaches ~1.5 kG at the surface and ~6 kG in the interior; and the surface structure resembles solar pores. The magnetic structure remains stable for the whole simulation run of several hours with no sign of decay.
Yuji Tokunaga - One of the best experts on this subject based on the ideXlab platform.
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Spontaneous Formation and amplification of an enantioenriched α amino nitrile a chiral precursor for strecker amino acid synthesis
ChemInform, 2015Co-Authors: Tsuneomi Kawasaki, Naoya Takamatsu, Shohei Aiba, Yuji TokunagaAbstract:Without the addition of any chiral substances, the Spontaneous Formation of an enantioenriched α-amino nitrile (up to 96% ee), which is a chiral precursor for Strecker amino acid synthesis, is achieved in combination with conglomerate Formation.
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Spontaneous Formation and amplification of an enantioenriched α amino nitrile a chiral precursor for strecker amino acid synthesis
Chemical Communications, 2015Co-Authors: Tsuneomi Kawasaki, Naoya Takamatsu, Shohei Aiba, Yuji TokunagaAbstract:Without the addition of any chiral substances, the Spontaneous Formation of an enantioenriched α-amino nitrile (up to 96% ee), which is a chiral precursor for Strecker amino acid synthesis, has been achieved in combination with conglomerate Formation. The frequency of the Formation of enantiomorphs exhibits an approximate stochastic distribution, i.e., L-form occurred 21 times and D-form occurred 22 times, which fulfils the conditions necessary for Spontaneous absolute asymmetric synthesis.
I N Kitiashvili - One of the best experts on this subject based on the ideXlab platform.
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mechanism of Spontaneous Formation of stable magnetic structures on the sun
The Astrophysical Journal, 2010Co-Authors: I N Kitiashvili, Albert A WRAY, Alexander G. Kosovichev, Nagi N MansourAbstract:One of the puzzling features of solar magnetism is Formation of long-living compact magnetic structures, such as sunspots and pores, in the highly turbulent upper layer of the solar convective zone. We use realistic radiative three-dimensional MHD simulations to investigate the interaction between magnetic field and turbulent convection. In the simulations, a weak vertical uniform magnetic field is imposed in a region of fully developed granular convection, and the total magnetic flux through the top and bottom boundaries is kept constant. The simulation results reveal a process of Spontaneous Formation of stable magnetic structures, which may be a key to understanding the magnetic self-organization on the Sun and Formation of pores and sunspots. This process consists of two basic steps: (1) Formation of small-scale filamentary magnetic structures associated with concentrations of vorticity and whirlpool-type motions, and (2) merging of these structures due to the vortex attraction, caused by converging downdrafts around magnetic concentration below the surface. In the resulting large-scale structure maintained by the converging plasma motions, the magnetic field strength reaches ~1.5 kG at the surface and ~6 kG in the interior, and the surface structure resembles solar pores. The magnetic structure remains stable for the whole simulation run of several hours with no sign of decay.
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Mechanism of Spontaneous Formation of stable magnetic structures on the Sun
The Astrophysical Journal, 2010Co-Authors: I N Kitiashvili, Albert A WRAY, Alexander G. Kosovichev, Nagi N MansourAbstract:One of the puzzling features of solar magnetism is Formation of long-living compact magnetic structures; such as sunspots and pores, in the highly turbulent upper layer of the solar convective zone. We use realistic radiative 3D MHD simulations to investigate the interaction between magnetic field and turbulent convection. In the simulations, a weak vertical uniform magnetic field is imposed in a region of fully developed granular convection; and the total magnetic flux through the top and bottom boundaries is kept constant. The simulation results reveal a process of Spontaneous Formation of stable magnetic structures, which may be a key to understanding of the magnetic self-organization on the Sun and Formation of pores and sunspots. This process consists of two basic steps: 1) Formation of small-scale filamentary magnetic structures associated with concentrations of vorticity and whirlpool-type motions, and 2) merging of these structures due to the vortex attraction, caused by converging downdrafts around magnetic concentration below the surface. In the resulting large-scale structure maintained by the converging plasma motions, the magnetic field strength reaches ~1.5 kG at the surface and ~6 kG in the interior; and the surface structure resembles solar pores. The magnetic structure remains stable for the whole simulation run of several hours with no sign of decay.
Tsuneomi Kawasaki - One of the best experts on this subject based on the ideXlab platform.
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Spontaneous Formation and amplification of an enantioenriched α amino nitrile a chiral precursor for strecker amino acid synthesis
ChemInform, 2015Co-Authors: Tsuneomi Kawasaki, Naoya Takamatsu, Shohei Aiba, Yuji TokunagaAbstract:Without the addition of any chiral substances, the Spontaneous Formation of an enantioenriched α-amino nitrile (up to 96% ee), which is a chiral precursor for Strecker amino acid synthesis, is achieved in combination with conglomerate Formation.
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Spontaneous Formation and amplification of an enantioenriched α amino nitrile a chiral precursor for strecker amino acid synthesis
Chemical Communications, 2015Co-Authors: Tsuneomi Kawasaki, Naoya Takamatsu, Shohei Aiba, Yuji TokunagaAbstract:Without the addition of any chiral substances, the Spontaneous Formation of an enantioenriched α-amino nitrile (up to 96% ee), which is a chiral precursor for Strecker amino acid synthesis, has been achieved in combination with conglomerate Formation. The frequency of the Formation of enantiomorphs exhibits an approximate stochastic distribution, i.e., L-form occurred 21 times and D-form occurred 22 times, which fulfils the conditions necessary for Spontaneous absolute asymmetric synthesis.
Albert A WRAY - One of the best experts on this subject based on the ideXlab platform.
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mechanism of Spontaneous Formation of stable magnetic structures on the sun
The Astrophysical Journal, 2010Co-Authors: I N Kitiashvili, Albert A WRAY, Alexander G. Kosovichev, Nagi N MansourAbstract:One of the puzzling features of solar magnetism is Formation of long-living compact magnetic structures, such as sunspots and pores, in the highly turbulent upper layer of the solar convective zone. We use realistic radiative three-dimensional MHD simulations to investigate the interaction between magnetic field and turbulent convection. In the simulations, a weak vertical uniform magnetic field is imposed in a region of fully developed granular convection, and the total magnetic flux through the top and bottom boundaries is kept constant. The simulation results reveal a process of Spontaneous Formation of stable magnetic structures, which may be a key to understanding the magnetic self-organization on the Sun and Formation of pores and sunspots. This process consists of two basic steps: (1) Formation of small-scale filamentary magnetic structures associated with concentrations of vorticity and whirlpool-type motions, and (2) merging of these structures due to the vortex attraction, caused by converging downdrafts around magnetic concentration below the surface. In the resulting large-scale structure maintained by the converging plasma motions, the magnetic field strength reaches ~1.5 kG at the surface and ~6 kG in the interior, and the surface structure resembles solar pores. The magnetic structure remains stable for the whole simulation run of several hours with no sign of decay.
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Mechanism of Spontaneous Formation of stable magnetic structures on the Sun
The Astrophysical Journal, 2010Co-Authors: I N Kitiashvili, Albert A WRAY, Alexander G. Kosovichev, Nagi N MansourAbstract:One of the puzzling features of solar magnetism is Formation of long-living compact magnetic structures; such as sunspots and pores, in the highly turbulent upper layer of the solar convective zone. We use realistic radiative 3D MHD simulations to investigate the interaction between magnetic field and turbulent convection. In the simulations, a weak vertical uniform magnetic field is imposed in a region of fully developed granular convection; and the total magnetic flux through the top and bottom boundaries is kept constant. The simulation results reveal a process of Spontaneous Formation of stable magnetic structures, which may be a key to understanding of the magnetic self-organization on the Sun and Formation of pores and sunspots. This process consists of two basic steps: 1) Formation of small-scale filamentary magnetic structures associated with concentrations of vorticity and whirlpool-type motions, and 2) merging of these structures due to the vortex attraction, caused by converging downdrafts around magnetic concentration below the surface. In the resulting large-scale structure maintained by the converging plasma motions, the magnetic field strength reaches ~1.5 kG at the surface and ~6 kG in the interior; and the surface structure resembles solar pores. The magnetic structure remains stable for the whole simulation run of several hours with no sign of decay.
