243,274 research outputs found
A compiled catalog of rotation measures of radio point sources
We compiled a catalog of Faraday rotation measures (RMs) for 4553
extragalactic radio point sources ublished in literature. These RMs were
derived from multi-frequency polarization observations. The RM data are
compared to those in the NRAO VLA Sky Survey (NVSS) RM catalog. We reveal a
systematic uncertainty of about \,rad~m in the NVSS RM
catalog. The Galactic foreground RM is calculated through a weighted averaging
method by using the compiled RM catalog together with the NVSS RM catalog, with
careful consideration of uncertainties in the RM data. The data from the
catalog and the interface for the Galactic foreground RM calculations are
publicly available on the webpage: http://zmtt.bao.ac.cn/RM/.Comment: 17 pages, 8 figures. Published already, at
http://www.raa-journal.org/raa/index.php/raa/article/view/171
Secure Communication for Spatially Sparse Millimeter-Wave Massive MIMO Channels via Hybrid Precoding
In this paper, we investigate secure communication over sparse millimeter-wave (mm-Wave) massive multiple-input multiple-output (MIMO) channels by exploiting the spatial sparsity of legitimate user's channel. We propose a secure communication scheme in which information data is precoded onto dominant angle components of the sparse channel through a limited number of radio-frequency (RF) chains, while artificial noise (AN) is broadcast over the remaining nondominant angles interfering only with the eavesdropper with a high probability. It is shown that the channel sparsity plays a fundamental role analogous to secret keys in achieving secure communication. Hence, by defining two statistical measures of the channel sparsity, we analytically characterize its impact on secrecy rate. In particular, a substantial improvement on secrecy rate can be obtained by the proposed scheme due to the uncertainty, i.e., 'entropy', introduced by the channel sparsity which is unknown to the eavesdropper. It is revealed that sparsity in the power domain can always contribute to the secrecy rate. In contrast, in the angle domain, there exists an optimal level of sparsity that maximizes the secrecy rate. The effectiveness of the proposed scheme and derived results are verified by numerical simulations
On the signature of certain intersection forms
We prove a conjecture of Zuber on the signature of intersection froms
associated with affine algebras of type A.Comment: 10 pages, Amste
Gluonic probe for the short range correlation in nucleus
We investigate the gluonic probe to the nucleon-nucleon short range correlation (SRC) in nucleus through heavy flavor production in deep inelastic scattering (DIS). The relevant EMC effects of [Formula presented] structure function will provide a universality test of the SRCs which have been extensively studied in the quark-channel. These SRCs can also be studied through the sub-threshold production of heavy flavor in eA collisions at the intermediate energy electron-ion collider, including open Charm and J/ψ (ϒ) production
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