3,708 research outputs found
Cross listing and firm value - corporate governance or market segmentation? An empirical study of the stock market
This study investigates the economic consequences of cross-listing on the Chinese stock market. We argue that by adopting a higher disclosure standard through cross- listing firms voluntarily commit themselves to reducing information asymmetry. As a result, cross-listed firms are able to benefit from growth opportunities with less appropriated cash flow and lower cost of capital. The empirical evidence shows that cross-listed firms indeed command higher valuations than their non-cross-listed counterparts, after controlling for certain firm-specific attributes. This lends support to the corporate governance hypothesis of cross-listing on the Chinese stock market. The study also argues that an overall upgrad-ing of accounting standards cannot substitute for the cross-listing mechanism.corporate governance; listing; China
A mechanism of conductance plateau without 1D chiral Majorana fermions
We address the question about the origin of the
conductance plateau observed in a recent experiment on an integer quantum Hall
(IQH) film covered by a superconducting (SC) film. Since 1-dimensional (1D)
chiral Majorana fermions on the edge of the above device can give rise to the
half quantized plateau, such a plateau was regarded as a smoking-gun evidence
for the chiral Majorana fermions. However, in this paper we give another
mechanism for the conductance plateau. We find the
conductance plateau to be a general feature of a good
electric contact between the IQH film and SC film, and cannot distinguish the
existence or the non-existence of 1D chiral Majorana fermions. We also find
that the contact conductance between SC and an IQH edge channel has a non-Ohmic
form in limit, if the SC and
IQH bulks are fully gapped.Comment: 6 pages, 4 figures. The T=0 calculation is updated for a more general
situation (k_F=/=0). The results are not affecte
Competition between the inter-valley scattering and the intra-valley scattering on magnetoconductivity induced by screened Coulomb disorder in Weyl semimetals
Recent experiments on Weyl semimetals reveal that charged impurities may play
an important role. We use a screened Coulomb disorder to model the charged
impurities, and study the magneto-transport in a two-node Weyl semimetal. It is
found that when the external magnetic field is applied parallel to the electric
field, the calculated longitudinal magnetoconductivity shows positive in the
magnetic field, which is just the negative longitudinal magnetoresistivity
(LMR) observed in experiments. When the two fields are perpendicular to each
other, the transverse magnetoconductivities are measured. It is found that the
longitudinal (transverse) magnetoconductivity is suppressed (enhanced)
sensitively with increasing the screening length. This feature makes it hardly
to observe the negative LMR in Weyl semimetals experimentally owing to a small
screening length. Our findings gain insight into further understanding on
recently actively debated magneto-transport behaviors in Weyl semimetals.
Furthermore we studied the relative weight of the inter-valley scattering and
the intra-valley scattering. It shows that the former is as important as the
latter and even dominates in the case of strong magnetic fields and small
screening length. We emphasize that the discussions on inter-valley scattering
is out of the realm of one-node model which has been studied.Comment: 14 pages, 5 figure
Research on the method of selecting Point elements of electronic map based on Voronoi diagram
In this paper, a method of selecting point elements in electronic map based on Voronoi diagram is proposed. The retained
point elements can better refl ect the weight of their spatial distribution. The POI is gridded in advance, the grid index is established, and the
speed of Voronoi graph is improved. The distance limit between adjacent POI is added to ensure that the adjacent POI does not confl ict with
each other when displaying name notes, thus improving the display performance of terminal map
Is China’s financing for climate change prevention ensure green environment? Evaluating the role of higher education
Over the last few years, China has maintained rapid economic
growth globally. China has initiated various investments and
improved higher education to tackle climate change issues and
ensure a green environment. This study examines the influence of
economic growth, higher education graduates, household consumption
expenditures, industrial pollution prevention investment,
and energy industry investment. Covering the period from
2000 to 2017, this study investigated a panel of 30 Chinese provinces.
The data under study follows an irregular pattern, and all
the variables are cointegrated; therefore, this study employed the
novel method of moment quantile regression. Empirical findings
suggest that economic growth and investment in the energy
industry are the significant contributors to carbon emission in all
the quantiles Q0.25, Q0.50, and Q0.75. However, higher education
graduates, household consumption expenditures, and investment
in industrial pollution prevention negatively and significantly
affect carbon emissions and promote environmental sustainability.
The Granger causality test reveals a bidirectional causal association
between carbon emissions and the explanatory variables.
Based on the empirical findings, this study suggests investment in
environmental recovery plans, adopting renewable energy sources,
improving the level of higher education by more investments
for higher education graduates, environmental education, and
increased investment in pollution prevention industries
Unification of Flavor SU(3) Analyses of Heavy Hadron Weak Decays
Analyses of heavy mesons and baryons hadronic charmless decays using the
flavor SU(3) symemtry can be formulated in two different forms. One is to
construct the SU(3) irreducible representation amplitude (IRA) by decomposing
effective Hamiltonian, and the other is to draw the topological diagrams (TDA).
In the flavor SU(3) limit, we study various ,
decays, and two-body nonleptonic decays of beauty/charm baryons, and
demonstrate that when all terms are included these two ways of analyzing the
decay amplitudes are completely equivalent. Furthermore we clarify some
confusions in drawing topological diagrams using different ways of describing
beauty/charm baryons.Comment: 36 pages, 6 figures, 16 table
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