4,398 research outputs found
Education, risk perceptions, and health behaviors
It is acknowledged that there exists an association between education and health behaviors, but channels through which educational gradients resulted are not well investigated. We propose that personal risk perceptions of developing cancers in the future account for part of the gradients. To explore it, we merge two datasets to test causal effects at both individual and MSA levels. Endogeneity is considered and eased. We find that risk perceptions significantly enhance people’s smoking decisions, and prostate cancer and colorectal cancer screening. Educational gradients are robust perceived risks. It is suggested to improve health behaviors, health service providers and public health manager should take measures to enhance personal perceived risk toward diseases.Education; Risk Perceptions; and Health Behaviors
One-side Forward-backward Asymmetry in Top Quark Pair Production at CERN Large Hadron Collider
Both D0 and CDF at Tevatron reported the measurements of forward-backward
asymmetry in top pair production, which showed possible deviation from the
standard model QCD prediction. In this paper, we explore how to examine the
{\em same} higher-order QCD effects at the more powerful Large Hadron Collider.Comment: 4 pages, 6 figures, Refs added, published versio
A Data-Aided Channel Estimation Scheme for Decoupled Systems in Heterogeneous Networks
Uplink/downlink (UL/DL) decoupling promises more flexible cell association
and higher throughput in heterogeneous networks (HetNets), however, it hampers
the acquisition of DL channel state information (CSI) in time-division-duplex
(TDD) systems due to different base stations (BSs) connected in UL/DL. In this
paper, we propose a novel data-aided (DA) channel estimation scheme to address
this problem by utilizing decoded UL data to exploit CSI from received UL data
signal in decoupled HetNets where a massive multiple-input multiple-output BS
and dense small cell BSs are deployed. We analytically estimate BER performance
of UL decoded data, which are used to derive an approximated normalized mean
square error (NMSE) expression of the DA minimum mean square error (MMSE)
estimator. Compared with the conventional least square (LS) and MMSE, it is
shown that NMSE performances of all estimators are determined by their
signal-to-noise ratio (SNR)-like terms and there is an increment consisting of
UL data power, UL data length and BER values in the SNR-like term of DA method,
which suggests DA method outperforms the conventional ones in any scenarios.
Higher UL data power, longer UL data length and better BER performance lead to
more accurate estimated channels with DA method. Numerical results verify that
the analytical BER and NMSE results are close to the simulated ones and a
remarkable gain in both NMSE and DL rate can be achieved by DA method in
multiple scenarios with different modulations
Anisotropic distributions in a multi-phase transport model
With A Multi-Phase Transport (AMPT) model we investigate the relation between
the magnitude, fluctuations and correlations of the initial state spatial
anisotropy and the final state anisotropic flow coefficients
in Au+Au collisions at 200 GeV. It is found
that the relative eccentricity fluctuations in AMPT account for the observed
elliptic flow fluctuations, in agreement with measurements of the STAR
collaboration. In addition, the studies based on 2- and multi-particle
correlations and event-by-event distributions of the anisotropies suggest that
the Elliptic-Power function is a promising candidate of the underlying
probability density function of the event-by-event distributions of
as well as . Furthermore, the correlations between
different order symmetry planes and harmonics in the initial coordinate space
and final state momentum space are presented. Non-zero values of these
correlations have been observed. The comparison between our calculations and
data will, in the future, shed new insight into the nature of the fluctuations
of the Quark-Gluon Plasma produced in heavy ion collisions.Comment: 10 pages, 8 figures, accepted by PR
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