44 research outputs found
Some Key Problems Related to Radioactive Ion Beam Physics
No full textThe latest progress made in the field of radioactive ion beam physics is outlined and the key problems still under investigation are indicated. The focal points are the limit of nuclear existence, shell evolution and new magic numbers, halo and cluster structures, new excitation modes, and strong coupling between reaction channels. This field is still at a starting phase and much more new outcomes are foreseen.Physics, Fluids & PlasmasSCI(E)EI中国科学引文数据库(CSCD)0ARTICLE5360-3631
Quantum geometry of moduli spaces of local systems and representation theory
No full textLet G be a split semi-simple adjoint group, and S a colored decorated surface, given by an oriented surface with punctures, special boundary points, and a specified collection of boundary intervals.
We introduce a moduli space P(G,S) parametrizing G-local system on S with some boundary data, and prove that it carries a cluster Poisson structure, equivariant under the action of the cluster modular group M(G,S), containing the mapping class group of S, the group of outer automorphisms of G, and the product of Weyl / braid groups over punctures / boundary components. We prove that the dual moduli space A(G,S) carries a M(G,S)-equivariant cluster structure, and the pair (A(G,S), P(G,S)) is a cluster ensemble. These results generalize the works of V. Fock & the first author, and of I. Le.
We quantize cluster Poisson varieties X for any Planck constant h s.t. h>0 or |h|=1. First, we define a *-algebra structure on the Langlands modular double A(h; X) of the algebra of functions on X. We construct a principal series of representations of the *-algebra A(h; X), equivariant under a unitary projective representation of the cluster modular group M(X). This extends works of V. Fock and the first author when h>0.
Combining this, we get a M(G,S)-equivariant quantization of the moduli space P(G,S), given by the *-algebra A(h; P(G,S)) and its principal series representations. We construct realizations of the principal series *-representations. In particular, when S is punctured disc with two special points, we get a principal series *-representations of the Langlands modular double of the quantum group Uq(g).
We conjecture that there is a nondegenerate pairing between the local system of coinvariants of oscillatory representations of the W-algebra and the one provided by the projective representation of the mapping class group of S.234 pages. Updated following the referee report. Sections 2.4, 13.4, 17.8, 17.9 20.3, 20.4 ne
SPC decreases cardiac infarct size, increases LV contractile function and attenuates histopathologic organ damage following I/R.
No full text<p><b>(A)</b> Rats were sacrificed at the end of reperfusion and the hearts removed and stained with TTC for the measurement of myocardial infarct area. The infarct size was expressed as a percentage of area at risk. <i>n</i> = 6 /group. <b>(B)</b> Echocardiography was performed at the end of reperfusion and representative M-mode echocardiograms were recorded in all groups. Rats without LAD occlusion served as basal controls (SHAM group). <i>n</i> = 10 /group. <b>(C)</b> LV tissues were retrieved at the end of reperfusion, paraffin section was prepared and subjected to the H&E staining. Representative H&E staining images are shown (magnification, 200×). Scale bar: 50μm. <i>n</i> = 3 /group. The columns and errors bars represent means ± SD. * <i>P</i> < 0.05 vs. SHAM group; # <i>P</i> < 0.05 vs. I/R group.</p
Rover Attitude and Camera Parameter: Rock Measurements on Mars Surface Based on Rover Attitude and Camera Parameter for Tianwen-1 Mission
No full textRocks, prominent features on the surface of Mars, are a primary focus of Mars exploration missions. The accuracy of recognizing rock information, including size and position, deeply affects the path planning for rovers on Mars and the geological exploration of Mars. In this paper, we present a rock measurement method for the Mars surface based on a Rover Attitude and Camera Parameter (RACP). We analyze the imaging process of the Navigation and Terrain Camera (NaTeCam) on the Zhurong rover, which involves utilizing a semi-spherical model (SSM) to characterize the camera’s attitude, a projection model (PM) to connect the image data with the three-dimensional (3D) environment, and then estimating the distance and size of rocks. We conduct a test on NaTeCam images and find that the method is effective in measuring the distance and size to Martian rocks and identifying rocks at specific locations. Furthermore, an analysis of the impact of uncertain factors is conducted. The proposed RACP method offers a reliable solution for automatically analyzing the rocks on Mars, which provides a possible solution for the route planning in similar tasks
Calculation of Carrier Doping-Induced Half-Metallicity, and Transformation of Easy Axis in Two-Dimensional MSi2N4 (M = Cr, Mn, Fe, and Co) Monolayers
No full textWe study the stability, electrical properties, and magnetic properties of
MSi2N4 (M = Cr, Mn, Fe, and Co) monolayers based on the density functional
theory.Comment: 10 figure
Editorial: Novel Molecular Targets and Treatments for Gastroesophageal Cancer
No full textIn this Research Topic, we collected 20 papers under the title of “Novel Molecular Targets and Treatments for gastroesophageal Cancer” (Das et al., Power et al., Heng et al., Islam et al., Wang et al., Li et al., Zhang et al., Zhang et al., Deng et al., Bai et al., Lv et al., Guo et al., Chen et al., Luan et al., Jiang et al., Jafarzadeh and Soltani, Jin et al., Fang et al., Wang et al., Chen et al.). Cancers of the oesophagus and stomach account for 8.7% of new cases and 13.2% of new deaths of all sites worldwide (1). In the World Health Organization (WHO) classification of tumours, oesophageal cancer has two major histological types, namely squamous cell carcinoma (SCC) and adenocarcinoma (2).Full Tex
The Evolution of Price Dispersion in China's Passenger Car Markets
No full textThis research identified the rising price dispersion of passenger cars in Chinese cities during the period from 2004 to 2006. The sources of the price differentials were then further explored. The theoretical and empirical analyses suggest that the income effect (as reflected by income differentials across Chinese cities) and the competition effect (as reflected by car supply differentials across Chinese cities) largely account for regional automobile price differentials across China.Business, FinanceEconomicsInternational RelationsSSCI0ARTICLE7,SI947-9653
Tailing the Magnetoelectric Properties of Cr<sub>2</sub>Ge<sub>2</sub>Te<sub>6</sub> by Engineering Covalently Bonded Cr Self-Intercalation: Ferromagnetic Half-Metal
No full textTwo-dimensional intrinsic ferromagnetic half-metals (HMs)
are important
for spintronics. Based on a systematic research of CrGeTe3 (CGT) bilayers and multilayers with the self-intercalated (SI) Cr
(CrSI) atom, we find that self-intercalation can enhance
interlayer magnetic coupling, which results in a super-exchange interaction
between interlayers. The CGT bilayer keeps half-metallicity with the
interlayer ferromagnetic (FM) order after Cr’s self-intercalation,
independent of CrSI atoms’ concentration and stacking
orders. Moreover, SI-CGT multilayers with interlayer FM order transform
from HMs into normal spin-polarized metals, as the states at the Fermi
level increase. Moreover, the magnetic anisotropy energies (MAEs)
of SI-CGT-AA and SI-CGT-AB are −0.160 and −0.42 meV/f.u.,
respectively, which are modulated by the CrSI atoms. The
MAEs of SI-CGT-AA and SI-CGT-AB are different, as the hybridization
interactions between Cr’s d orbitals are different from each
other. SI-CGT bilayers’ magnetic easy axis (EA) switches from
the original [001] of CGT to the [100] direction, independent of the
stacking orders. It is inferred that the MAE is mainly contributed
by the hybridization between Te’s px and py, py and pz orbitals, and that this hybridization
interaction is obviously weakened as CrSI atom is inserted.
The SI-CGT bilayers and multilayers show good dynamic and thermal
stability at 300 and 500 K. These findings offer a promising way to
manipulate the interlayer exchange interaction and magnetoelectric
properties of CGT multilayers and other vdW magnets
SPC ameliorates mitochondrial disorder and dysfunction after I/R.
No full text<p><b>(A)</b> LV tissues were harvested for examination of myocardial ultrastructure by transmission electron microscopy (TEM). Typical TEM images obtained at a magnification (20000×) of cardiac ultrastructure in all groups. Note that myofilaments were absent (*) and damaged mitochondria (^) nearby the autophagosomes (→). Scale bar: 2μm. <i>n</i> = 3 /group. M: mitochondria; S: sarcomeres. <b>(B)</b> SPC prevents depletion of ATP stores in I/R hearts and the ATP content in all groups are shown. <i>n</i> = 6 /group. <b>(C)</b> After 2 h of reperfusion, LV tissues were obtained and analyzed by real-time PCR for the expression levels of Cycs, Cox4il, Ndufa2, Ndufa4, Ndufa8, Cox7a1, Cox7a2 and TFAM. <i>n</i> = 6 /group. <b>(D)</b> LV were collected and prepared for immunoblots. Representative immunoblots and semiquantitative analysis of Nrf1 and PGC-1 in each group of rats after reperfusion. The blots for Tubulin were served as loading controls. <i>n</i> = 4 /group. All data are presented as means ± SD. * <i>P</i> < 0.05 vs. SHAM group; # <i>P</i> < 0.05 vs. I/R group.</p
