2,749 research outputs found
Improving QCD with fermions: the 2 dimensional case of QCD with Sea Quarks
We study QCD in 2 dimensions using the improved lattice fermionic Hamiltonian
proposed by Luo, Chen, Xu and Jiang. The vector mass and the chiral condensate
are computed for various gauge groups. We do observe considerable
improvement in comparison with the Wilson quark case.Comment: LATTICE98(improvement
Evaluation of Transportation Network Reliability under Emergency Based on Reserve Capacity
There are differences between the requirements for traffic network for traffic demand in daily and emergency situations. In order to evaluate how the network designed for daily needs can meet the surging demand for emergency evacuation, the concept of emergency reliability and corresponding evaluation method is proposed. This paper constructs a bilevel programming model to describe the proposed problem. The upper level problem takes the maximum reserve capacity multiplier as the optimization objective and considers the influence of reversible lane measures taken under emergency conditions. The lower level model adopts the combined traffic distribution/assignment model with capacity limits, to describe evacuees’ path and shelter choice behavior under emergency conditions and take into account the traits of crowded traffic. An iterative optimization method is proposed to solve the upper level model, and the lower level model is transformed into a UE assignment problem with capacity limits over a network of multiple origins and single destination, by adding a dummy node and several dummy links in the network. Then a dynamic penalty function algorithm is used to solve the problem. In the end, numerical studies and results are provided to demonstrate the rationality of the proposed model and feasibility of the proposed solution algorithms.
Document type: Articl
Enhancement of baryon-to-meson ratios around jets as a signature of medium response
We present a unique signal of jet-induced medium excitations: the enhancement
of baryon-to-meson ratios around the quenched jets. To illustrate this, we
study jet-particle correlations and the distributions of jet-induced identified
particles with respect to the jet direction in Pb+Pb collisions at the LHC via
a multi-phase transport model. We find a strong enhancement of baryon-to-meson
ratios for associated particles at intermediate transverse momentum around the
triggered jets in Pb+Pb collisions relative to p+p collisions, due to the
coalescence of jet-excited medium partons. Since the lost energy from jets can
diffuse to large angles, such baryon-to-meson-ratio enhancement is more
pronounced for larger relative distance from the jet axis. We argue that the
experimental confirmation of the enhancement of jet-induced baryon-to-meson
ratios around the jets will provide an unambiguous evidence for the medium
response to jet quenching in heavy-ion collisions.Comment: 6 pages, 3 figure
Pseudo-Parity-Time Symmetry in Optical Systems
We introduce a novel concept of the pseudo-parity-time (pseudo-PT) symmetry in periodically modulated optical systems with balanced gain and loss. We demonstrate that whether or not the original system is PT symmetric, we can manipulate the property of t
An amine-reactive tetraphenylethylene derivative for protein detection in SDS-PAGE
A new aggregation-induced emission (AIE) compound 1,2-bis[4-(isothiocyanatomethyl)phenyl]-1,2-diphenylethene (2) was synthesized for use in SDS-PAGE. The molecule is practically nonemissive in solution but becomes highly emissive after reacting with the amine groups of the proteins by either the prestaining or poststaining method. The sensitivity of 2 achieved in the prestaining method is the same as that of Coomassie brilliant blue (CBB), while that observed in the poststaining method is higher than that of CBB. Excellent linear responses with the amount of protein were obtained in both cases. The detection of a mixture of proteins with different molecular weights was successfully achieved
1,4-Dibromo-2,5-dimethoxybenzene
The asymmetric unit of the title compound, C8H8Br2O2, contains one half-molecule, the complete molecule being generated by inversion symmetry
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