2,309 research outputs found
Triminimal Parametrization of Quark Mixing Matrix
Starting from a new zeroth order basis for quark mixing (CKM) matrix based on
the quark-lepton complementarity and the tri-bimaximal pattern of lepton
mixing, we derive a triminimal parametrization of CKM matrix with three small
angles and a CP-violating phase as its parameters. This new triminimal
parametrization has the merits of fast convergence and simplicity in
application. With the quark-lepton complementary relations, we derive relations
between the two unified triminimal parametrizations for quark mixing obtained
in this work and for lepton mixing obtained by Pakvasa-Rodejohann-Weiler.
Parametrization deviating from quark-lepton complementarity is also discussed.Comment: 9 pages, no figur
Quantitative Characterization of Magnetic Flux Rope Properties for Two Solar Eruption Events
In order to bridge the gap between heliospheric and solar observations of
coronal mass ejections (CMEs), one of the key steps is to improve the
understanding of their corresponding magnetic structures like the magnetic flux
ropes (MFRs). But it remains a challenge to confirm the existence of a coherent
MFR before or upon the CME eruption on the Sun and to quantitatively
characterize the CME-MFR due to the lack of direct magnetic field measurement
in the corona. In this study, we investigate the MFR structures, originating
from two active regions (ARs), AR 11719 and AR 12158, and estimate their
magnetic properties quantitatively. We perform the nonlinear force-free field
extrapolations with preprocessed photospheric vector magnetograms. In addition,
remote-sensing observations are employed to find indirect evidence of MFRs on
the Sun and to analyze the time evolution of magnetic reconnection flux
associated with the flare ribbons during the eruption. A coherent
"pre-existing" MFR structure prior to the flare eruption is identified
quantitatively for one event from the combined analysis of the extrapolation
and observation. Then the characteristics of MFRs for two events on the Sun
before and during the eruption, forming the CME-MFR, including the axial
magnetic flux, field-line twist, and reconnection flux, are estimated and
compared with the corresponding in situ modeling results. We find that the
magnetic reconnection associated with the accompanying flares for both events
injects significant amount of flux into the erupted CME-MFRs.Comment: 28 pages, 10 figures, 3 tables, submitted to Ap
1-(2-Methylbenzyl)-1H-indole-3-carbaldehyde
In the title compound, C17H15NO, the benzene ring and the indole system are almost perpendicular, making a dihedral angle of 87.82 (6)°. The crystal packing is stabilized by C—H⋯O and π–π stacking interactions with centroid–centroid distances of 3.592 (4) Å between the pyrrole and the benzene rings in the indole systems of neighboring molecules
Diniconazole
The asymmetric unit of the title compound [systematic name: (E)-1-(2,4-dichlorophenyl)-4,4-dimethyl-2-(1H-1,2,4-triazol-1-yl)pent-1-en-3-ol], C15H17Cl2N3O, contains two molecules in which the dihedral angles between the triazole and benzene rings are 9.4 (2) and 35.0 (2)°. In the crystal, the molecules are linked by O—H⋯N hydrogen bonds, forming C(7) chains propagating in [010]
High-Speed Railway Tunnel Hood: Seismic Dynamic Characteristic Analysis
When a high‐speed train is passing through a tunnel, micro‐compression wave may be created at the tunnel exit, which will affect the environment around the railway line. Setting hood at tunnel entrance is one of the efficacious ways for solving this problem. While in an earthquake region, in addition to consideration of controlling micro‐compression wave, the seismic safety of hood structure must not overlook the factor. In this chapter, using finite difference method, several types of hood seismic dynamic characteristic were analyzed, and their seismic dynamic respond stress curves were drawn out. As a result, the recommended hood type was determined, which is helpful for hood design in high intensity earthquake zone
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