5,261 research outputs found
Transverse Momentum Dependent Parton Distributions at Small-x
We study the transverse momentum dependent (TMD) parton distributions at
small-x in a consistent framework that takes into account the TMD evolution and
small-x evolution simultaneously. The small-x evolution effects are included by
computing the TMDs at appropriate scales in terms of the dipole scattering
amplitudes, which obey the relevant Balitsky-Kovchegov equation. Meanwhile, the
TMD evolution is obtained by resumming the Collins-Soper type large logarithms
emerged from the calculations in small-x formalism into Sudakov factors.Comment: 23 pages, 9 figure
The consistency of estimator under fixed design regression model with NQD errors
In this article, basing on NQD samples, we investigate the fixed design
nonparametric regression model, where the errors are pairwise NQD random
errors, with fixed design points, and an unknown function. Nonparametric
weighted estimator will be introduced and its consistency is studied. As
special case, the consistency result for weighted kernel estimators of the
model is obtained. This extends the earlier work on independent random and
dependent random errors to NQD case
Ferroelectricity of Ice Nanotubes inside Carbon Nanotubes
We report that ice nanotubes with odd number of side faces inside carbon
nanotubes exhibit spontaneous electric polarization along its axes direction by
using molecular dynamics simulations. The mechanism of this nanoscale
quasi-one-dimensional ferroelectricity is due to low dimensional confinement
and the orientational order of hydrogen bonds. These ferroelectric fiber
structural materials are different from traditional perovskite structural bulk
materials.Comment: 4 pages and 4 figure
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