167,365 research outputs found
Effects of Isotope Substitution on Local Heating and Inelastic current in Hydrogen Molecular Junctions
Using first principle approaches, we investigate the effects of isotope
substitution on the inelastic features in the hydrogen molecular junction. We
observe thatlocal heating and inelastic current have significant
isotope-substitution effects. Due to the contact characters, the energies of
excited molecular vibrationsare inverse proportional to the square root of the
mass. The heavier the molecule, the smaller the onset bias. In the and
junctions, the heavier molecule has a smaller magnitude of
electron-vibration interaction. Consequently, there is a crossing in the local
temperature around . In the HD junction, the electron-vibration
interaction is enhanced by asymmetric distribution in mass. It leads to the
largest discontinuity in the differential conductance and the most prominent
heating in the HD junction. We predict that the junction instability is
relevant to isotope substitution. The HD junction has the smallest breakdown
voltage compared with the and junction
The relationships between corruption and pollution on corruption regimes
Previous studies have focused mainly on the effect of corruption on pollution. The results of these studies show an inverted U-shaped relationship between economic growth and pollution. In addition, some researchers have suggested that corruption plays an important role in determining pollution. This study proposes the hypothesis of a nonlinear long-run relationship between pollution and corruption. The goal of the study is to investigate the threshold cointegration effect of pollution on corruption using panel data for 62 countries over the period from 1997 to 2004. The results show that the effect of the Corruption Perceptions Index (CPI) on pollution is insignificant in low-corruption regimes. This implies that corruption does not slow down environmental pollution in countries with low corruption. The impact of the CPI on environmental pollution is also insignificant in high-corruption regimes. This result implies that corruption has no adverse impact on environmental pollution in countries with high corruption.Corruption, Pollution, Threshold, Error-Correction Model
Nucleon partonic spin structure to be explored by the unpolarized Drell-Yan program of COMPASS experiment at CERN
The observation of the violation of Lam-Tung relation in the
Drell-Yan process triggered many theoretical speculations. The TMD Boer-Mulders
functions characterizing the correlation of transverse momentum and transverse
spin for partons in unpolarized hadrons could nicely account for the violation.
The COMPASS experiment at CERN will measure the angular distributions of
dimuons from the unpolarized Drell-Yan process over a wide kinematic region and
study the beam particle dependence. Significant statistics is expected from a
successful run in 2015 which will bring further understanding of the origin of
the violation of Lam-Tung relation and of the partonic transverse spin
structure of the nucleon.Comment: Proceedings of the 21st International Symposium on Spin Physics -
October 20-24, 2014, Beijing, China; 6 pages, 3 figures, 1 tabl
The effect of global-scale divergent circulation on the atmospheric water vapor transport and maintenance
The detection, distribution, and dynamics of atmospheric water on Earth was examined. How the high levels of water vapor and precipitation that occur over the tropics during the monsoon season result from the development of a strong divergent atmospheric circulation is discussed
On Hadronic Production of the Meson
Two of the approaches to the hadronic productions of the double heavy mesons
and are investigated. Comparison in various aspects on the
results obtained by the approaches is made and shown in figures and a table.
Some trial understanding of the approaches themselves and the achieved results
is presented. The results may be used as some references for discovering the
mesons at Tevatron and LHC.Comment: 18 pages, the revised version of hep-ph/940824
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