85 research outputs found
The chaotic effects in a nonlinear QCD evolution equation
The corrections of gluon fusion to the DGLAP and BFKL equations are discussed
in a united partonic framework. The resulting nonlinear evolution equations are
the well-known GLR-MQ-ZRS equation and a new evolution equation. Using the
available saturation models as input, we find that the new evolution equation
has the chaos solution with positive Lyaponov exponents in the perturbative
range. We predict a new kind of shadowing caused by chaos, which blocks the QCD
evolution in a critical small range. The blocking effect in the evolution
equation may explain the Abelian gluon assumption and even influence our
expectations to the projected Large Hadron Electron Collider (LHeC), Very Large
Hadron Collider (VLHC) and the upgrade (CppC) in a circular collider
(SppC).Comment: 58 pages, 23 figures,. Final version to appear in NP
Parton recombination effect in polarized parton distributions
Parton recombination corrections to the standard spin-dependent
Altarelli-Parisi evolution equation are considered in a nonlinear evolution
equation. The properties of this recombination equation and its relation with
the spin-averaged form are discussed.Comment: 25 pages, 1 figure, to be published in Nucl. Phys. B. Appendix is
correcte
Conflating point of interest (POI) data: A systematic review of matching methods
Point of interest (POI) data provide digital representations of places in the
real world, and have been increasingly used to understand human-place
interactions, support urban management, and build smart cities. Many POI
datasets have been developed, which often have different geographic coverages,
attribute focuses, and data quality. From time to time, researchers may need to
conflate two or more POI datasets in order to build a better representation of
the places in the study areas. While various POI conflation methods have been
developed, there lacks a systematic review, and consequently, it is difficult
for researchers new to POI conflation to quickly grasp and use these existing
methods. This paper fills such a gap. Following the protocol of Preferred
Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA), we conduct a
systematic review by searching through three bibliographic databases using
reproducible syntax to identify related studies. We then focus on a main step
of POI conflation, i.e., POI matching, and systematically summarize and
categorize the identified methods. Current limitations and future opportunities
are discussed afterwards. We hope that this review can provide some guidance
for researchers interested in conflating POI datasets for their research
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