2,724 research outputs found
Double -rescaling model and the nuclear effect of the parton distribution functions
In order to overcome the shortcoming of nonconservation of nuclear momentum
existing in the original -rescaling model(ORM) and avoid introducing
nuclear shadowing factor, we proposed a double -rescaling model(DRM)
for the parton distributions of the bound nucleon. Using the experimental data
of lepton-nucleus deep inelastic scattering(DIS) and the condition of the
nuclear momentum conservation, the -rescaling parameters of various
partons for Sn, Fe, Ca and C nuclei are determined. The rescaling parameters of
valence quark distributions are larger than unity and graduauly increases with
atomic number A, on the contrary, the rescaling parameters of sea quark
distributions and gluon distributions are smaller than unity, and slowly
decreases with A. By using this model, the experimental data of the DIS
process, the nuclear Drell-Yan process and photoproduction process are
consistently and quite satisfactorily explained. Key words --- parton
distribution functions, Nuclear effect, Double -rescaling model.Comment: 15 pages, 4 figures (to be published in Z. Phys. C
A new completely integrable Liouville\u27s system produced by the Kaup-Newell elgenvalue problem
Under the constraint between the potentials and eigenfunctions, the KaupâNewell eigenvalue problem is nonlinearized as a new completely integrable Hamiltonian system (R2N,dpÎdq,H): H=iăÎ2p,qă+1/2ăÎq,qăăÎp,pă. Furthermore, the involutive solution of the highâorder KaupâNewell equation is obtained. Specifically, the involutive solution of the wellâknown derivative Schrödinger equation ut=1/2iuxx+1/2(uâuâ2)x is developed
Current stage of the ATCA follow-up for SPLASH
Four ground-state OH transitions were detected in emission, absorption and
maser emission in the Southern Parkes Large-Area Survey in Hydroxyl (SPLASH).
We re-observed these OH masers with the Australia Telescope Compact Array to
obtain positions with high accuracy (~1 arcsec). According to the positions, we
categorised these OH masers into different classes, i.e. star formation,
evolved stars, supernova remnants and unknown origin. We found one interesting
OH maser source (G336.644-0.695) in the pilot region, which has been studied in
detail in Qiao et al. (2016a). In this paper, we present the current stage of
the ATCA follow-up for SPLASH and discuss the potential future researches
derived from the ATCA data.Comment: 2 pages, conference, IAU symposium 33
Air-Water Gas Transfer at Hydraulic Jump with Partially Developed Inflow
In open channels, the transition from a rapid to fluvial flow is called a hydraulic jump. It is characterised by large scale turbulence, air bubble entrainment and energy dissipation. The author has investigated the air bubble entrainment at hydraulic jumps with partially developed inflow conditions. The air-water flow is characterised by a turbulent shear region with a large air content which contributes to the enhancement of the air-water interface area and air-water gas transfer in the hydraulic jump. A new gas transfer model is presented. Based upon physical evidence, the model enables to predict the dissolved gas contents and water quality downstream of hydraulic jumps with partially developed inflows
Labor Law Reform in China: Opportunities and Challenges for Improving Workers\u27 Lives (Fair Labor Association Stakeholder Forum Meeting Summary)
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