2,968 research outputs found
Holiday Destination Choice Behavior Analysis Based on AFC Data of Urban Rail Transit
For urban rail transit, the spatial distribution of passenger flow in holiday usually differs from weekdays. Holiday destination choice behavior analysis is the key to analyze passengers’ destination choice preference and then obtain the OD (origin-destination) distribution of passenger flow. This paper aims to propose a holiday destination choice model based on AFC (automatic fare collection) data of urban rail transit system, which is highly expected to provide theoretic support to holiday travel demand analysis for urban rail transit. First, based on Guangzhou Metro AFC data collected on New Year’s day, the characteristics of holiday destination choice behavior for urban rail transit passengers is analyzed. Second, holiday destination choice models based on MNL (Multinomial Logit) structure are established for each New Year’s days respectively, which takes into account some novel explanatory variables (such as attractiveness of destination). Then, the proposed models are calibrated with AFC data from Guangzhou Metro using WESML (weighted exogenous sample maximum likelihood) estimation and compared with the base models in which attractiveness of destination is not considered. The results show that the ρ2 values are improved by 0.060, 0.045, and 0.040 for January 1, January 2, and January 3, respectively, with the consideration of destination attractiveness
Alpha-Naphthylisothiocyanate triggering G2/M phase arrest and apoptosis in human brain malignant glioma U87MG cells via mitochondrial pathway
Anisotropic RKKY interaction in semi-Dirac semimetals
In -dimensional systems with purely linear dispersion, the
Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction typically follows an isotropic
decaying law ()
in doped (undoped) case, where denotes the density of states
(DOS). However, this law is not valid in semi-Dirac semimetal (S-DSM), which is
noted for its anisotropic dispersion, i.e., linear in certain axes but
parabolic in the orthogonal axes. By exploring the magnetic interaction in
-dimensional (2D) S-DSM and two types of 3D S-DSMs, new laws are derived for
the direction-dependent RKKY interaction. Compared to , the
interaction here decays much more slowly with the impurity distance as
impurities are deposited on the relativistic axis, while a faster decaying law
is exhibited with impurities deposited on the non-relativistic axis. The former
is induced by the prolonged decaying rate of the carrier propagator and the
modified DOS with smaller power , while the latter is caused by the
modification to the energy of the carrier propagator. The both are attributed
to the anisotropy of the semi-Dirac dispersion. We have further discussed the
case with spin-momentum locking. Some phenomena (not exist in DSMs) are
highlighted, including the strong magnetic anisotropy with spin model,
and the creation (annihilation) of Dzyaloshinskii-Moriya (DM) terms with
impurities deposited on the relativistic (non-relativistic) axis. Our work
provides an alternative option to identify the anisotropic nature of semi-Dirac
dispersion by measuring the RKKY interaction
Ethyl ent-15α-[(2-methoxybenzyloxy)methyl]-16-oxobeyeran-20-oate
The title compound, C31H44O5, was synthesized from isosteviol (systematic name: ent-16-ketobeyeran-19-oic acid). In the molecule, the three six-membered rings adopt chair conformations and the stereochemistry of the A/B and B/C ring junctions are trans. The five-membered ring D adopts an envelope conformation with the methylene C atom as the flap
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