2,908 research outputs found
Linguistic Map of "Breast" in Zhuang and Its Interpretations
The term âbreastâ is one of the basic words in a language. It has numerous lexical forms in Zhuang dialects, which can be divided into 13 groups. The lexical forms of the term âbreastâ can also be divided into five types, including n-, m-, p-, tÉ-, and Ê-, based on initials. Geographical distribution and etymological research showed that different forms emerged because of influences such as internal innovation, borrowing, and tonal derivation. Additionally, the word âbreastâ is intimate to women and is inappropriate for direct address. Therefore, people frequently use borrowed or invented forms to avoid this taboo, which contributes to the overlap of many forms
Secondary-electron radiation accompanying hadronic GeV-TeV gamma-rays from supernova remnants
The synchrotron radiation from secondary electrons and positrons (SEPs)
generated by hadronic interactions in the shock of supernova remnant (SNR)
could be a distinct evidence of cosmic ray (CR) production in SNR shocks. Here
we provide a method where the observed gamma-ray flux from SNRs, created by
pion decays, is directly used to derive the SEP distribution and hence the
synchrotron spectrum. We apply the method to three gamma-ray bright SNRs. In
the young SNR RX J1713.7-3946, if the observed GeV-TeV gamma-rays are of
hadronic origin and the magnetic field in the SNR shock is mG,
the SEPs may produce a spectral bump at eV, exceeding the
predicted synchrotron component of the leptonic model, and a soft spectral tail
at keV, distinct from the hard spectral slope in the leptonic
model. In the middle-aged SNRs IC443 and W44, if the observed gamma-rays are of
hadronic origin, the SEP synchrotron radiation with G can
well account for the observed radio flux and spectral slopes, supporting the
hadronic origin of gamma-rays. Future microwave to far-infrared and hard X-ray
(>100keV) observations are encouraged to constraining the SEP radiation and the
gamma-ray origin in SNRs.Comment: 9 pages, 5 figures and 1 table, MNRAS accepte
Entanglement concentration for unknown atomic entangled states via entanglement swapping
An entanglement concentration scheme for unknown atomic entanglement states
is proposed via entanglement swapping in cavity QED. Because the interaction
used here is a large-detuned one between two driven atoms and a quantized
cavity mode, the effects of the cavity decay and thermal field have been
eliminated. These advantages can warrant the experimental feasibility of the
current scheme.Comment: 4 page
Half-Metallic Silicon Nanowires: Multiple Surface Dangling Bonds and Nonmagnetic Doping
By means of first-principles density functional theory calculations, we find
that hydrogen-passivated ultrathin silicon nanowires (SiNWs) along [100]
direction with symmetrical multiple surface dangling bonds (SDBs) and boron
doping can have a half-metallic ground state with 100% spin polarization, where
the half-metallicity is shown quite robust against external electric fields.
Under the circumstances with various SDBs, the H-passivated SiNWs can also be
ferromagnetic or antiferromagnetic semiconductors. The present study not only
offers a possible route to engineer half-metallic SiNWs without containing
magnetic atoms but also sheds light on manipulating spin-dependent properties
of nanowires through surface passivation.Comment: 4 pages, 5 figure
Poly[[diaquabis(2,2âČ-bipyridine-Îș2 N,NâČ)(ÎŒ3-5-hydroxyisophthalato-Îș5 O 1,O 1âČ:O 3,O 3âČ:O 3âČ)(ÎŒ3-5-hydroxyÂisophthalato-Îș4 O 1,O 1âČ:O 3:O 3âČ)(ÎŒ2-5-hydroxyisophthalato-Îș3 O 1,O 1âČ:O 3)didysprosium(III)] dihydrate]
The polymeric title compound, {[Dy2(C8H4O5)3(C10H8N2)2(H2O)2]·2H2O}n, contains two independent DyIII ions, both of which are nine-coordinated in a distorted tricapped trigonalâprismatic geometry. One DyIII ion is coordinated by five 5-hyÂdroxyÂisophthalate (hip) ligands and one 2,2âČ-bipyridine (bpy) ligand and the other by three hip ligands, one bpy ligand and two water molÂecules. The DyIII ions are bridged by the carboxylÂate groups of the hip ligands, forming a three-dimensional framework. OâHâŻO hydrogen bonds are present in the crystal structure
Numerical study of synchrotron and inverse-Compton radiation from gamma-ray burst afterglows with decaying microturbulence
The multiwavelength observations of GRB afterglows, together with some
high-performance particle-in-cell simulations, hint that the magnetic field may
decay behind the shock front. In this work, we develop a numerical code to
calculate the evolution of the accelerated electron distribution, their
synchrotron and inverse-Compton (IC) spectra and accordingly the light curves
(LCs) under the assumption of decaying microturbulence (DM) downstream of the
shock, with the fluid proper
time since injection. We find: (1) The synchrotron spectrum in the DM model is
similar to that in the homogeneous turbulence (HT) model with very low magnetic
field strength. However, the difference in the IC spectral component is
relatively more obvious between them, due to the significant change of the
postshock electron energy distribution with DM. (2) If the magnetic field decay
faster, there are less electrons cool fast, and the IC spectral component
becomes weaker. (3) The LCs in the DM model decay steeper than in the HT model,
and the spectral evolution and the LCs in the DM model is similar to the HT
model where the magnetic field energy fraction decreases with observer time,
. (4) The DM model can naturally
produce a significant IC spectral component in TeV energy range, but due to the
Klein-Nishina suppression the IC power cannot be far larger than the
synchrotron power. We apply the DM model to describe the afterglow data of GRB
190114C and find the magnetic field decay exponent and the
electron spectral index . Future TeV observations of the IC emission
from GRB afterglows will further help to probe the poorly known microphysics of
relativistic shocks.Comment: 14 pages, 9 figures, 3 tables, submitted to MNRAS, comments welcom
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