11,134 research outputs found
Rapidity bin multiplicity correlations from a multi-phase transport model
The central-arbitrary bin and forward-backward bin multiplicity correlation
patterns for Au+Au collisions at = GeV are
investigated within a multi-phase transport (AMPT) model. An interesting
observation is that for GeV Au+Au collisions, these two
correlation patterns both have an increase with the pseudorapidity gap, while
for GeV Au+Au collisions, they decrease. We mainly
discuss the influence of different evolution stages of collision system on the
central-arbitrary bin correlations, such as the initial conditions, partonic
scatterings, hadronization scheme and hadronic scatterings. Our results show
that the central-arbitrary bin multiplicity correlations have different
responses to partonic phase and hadronic phase, which can be suggested as a
good probe to explore the dynamical evolution mechanism of the hot dense matter
in high-energy heavy-ion collisions.Comment: 7pages, 6 figures, accepted for publication in EPJ
Haplotype association analysis of North American Rheumatoid Arthritis Consortium data using a generalized linear model with regularization
The Genetic Analysis Workshop 16 rheumatoid arthritis data include a set of 868 cases and 1194 controls genotyped at 545,080 single-nucleotide polymorphisms (SNPs) from the Illumina 550 k chip. We focus on investigating chromosomes 6 and 18, which have 35,574 and 16,450 SNPs, respectively. Association studies, including single SNP and haplotype-based analyses, were applied to the data on those two chromosomes. Specifically, we conducted a generalized linear model with regularization (rGLM) approach for detecting disease-haplotype association using unphased SNP data. A total of 444 and 43 four-SNP tests were found to be significant at the Bonferroni corrected 5% significance level on chromosome 6 and 18, respectively
CP asymmetry from resonance effect of B meson decay process with and K final states
We introduce the new resonance of , which produces some new strong phase associated with vector meson
resonance and thus can cause relatively large CP asymmetry at the range of
interferences. There are the resonances of , and due to the mixing
of vector mesons , , . We calculate the CP asymmetry from
the decay modes of . Meanwhile, the localised CP
asymmetries are presented and some detailed analysis can be found. The CP
asymmetry from the decay mode of is also presented in our framework which is well consisted
with LHC experiment. The introduced CP asymmetry can provide a favorable
theoretical support for the experimental exploration in the future
Container vehicle-truss bridge coupled vibration analysis and structural safety assessment under stochastic excitation
The container vehicle-truss bridge coupled vibration greatly affects the automated container terminals’ (ACT) structural safety and handling efficiency. Using free-interface component mode synthesis (CMS) method, the coupled vibration time-domain responses, under self-excitation including track irregularity and hunting movement as well as environmental excitations such as wind and seismic load, were obtained. Stochastic simulation of track irregularity and fluctuating wind time-history was generated based on the numerical simulation method of multidimensional homogeneous process. A scale model test was introduced to validate the CMS method’s effectiveness and vehicle speed’s influence on coupled vibration response. In this case, the vehicle-bridge vertical vibration is caused mainly by the vehicle moving load, and self-excitation is a major factor. Wind, seismic load will greatly enhance the lateral vibration. And the sensitivity of the response to the seismic load is greater than operational wind load. As vehicle velocity, fluctuating wind mean velocity or ground motion intensity increase, the responses increase. Then, the structural safety, running safety and stability were assessed by the indicators such as deflection-span ratio, acceleration response etc., under wind load only and under operational wind and ground motion excited simultaneously. It is proved by both prototype simulation and model test results that, lead rubber bearing (LRB) can effectively reduce the acceleration response of both the vehicle and the bridge; therefore, can raise vehicle speed limits for structural and running safety
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