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Name
arXiv.org e-Print Archive
Type
Thematic Repository
Items
1393925 Publications
Compatibility
OpenAIRE Basic (DRIVER OA)
OAI-PMH
http://export.arxiv.org/oai2
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  • Energy-Efficient NOMA Enabled Heterogeneous Cloud Radio Access Networks

    Zhou, Fuhui; Wu, Yongpeng; Hu, Rose Qingyang; Wang, Yuhao; Wong, Kai-Kit (2018)
    Heterogeneous cloud radio access networks (H-CRANs) are envisioned to be promising in the fifth generation (5G) wireless networks. H-CRANs enable users to enjoy diverse services with high energy efficiency, high spectral efficiency, and low-cost operation, which are achieved by using cloud computing and virtualization techniques. However, H-CRANs face many technical challenges due to massive user connectivity, increasingly severe spectrum scarcity and energy-constrained devices. These challen...

    Time in quantum gravity

    Huggett, Nick; Vistarini, Tiziana; Wuthrich, Christian (2012)
    The Wheeler-DeWitt equation in quantum gravity is timeless in character. In order to discuss quantum to classical transition of the universe, one uses a time prescription in quantum gravity to obtain a time contained description starting from Wheeler-DeWitt equation and WKB ansatz for the WD wavefunction. The approach has some drawbacks. In this work, we obtain the time-contained Schroedinger-Wheeler-DeWitt equation without using the WD equation and the WKB ansatz for the wavefunction. We fur...

    Scattering of charge carriers in graphene induced by topological defects

    Fonseca, J. M.; Moura-Melo, W. A.; Pereira, A. R. (2009)
    We study the scattering of graphene quasiparticles by topological defects, represented by holes, pentagons and heptagons. For the case of holes, we obtain the phase shift and found that at low concentration they appear to be irrelevant for the electron transport, giving a negligible contribution to the resistivity. Whenever pentagons are introduced into the lattice and the fermionic current is constrained to move near one of them we realize that such a current is scattered with an angle that ...

    Particle production in proton-proton collisions

    Ghoneim, M. T.; Hussein, M. T.; Sawy, F. H. (2014)
    In this work, we present a study of particle production in proton-proton collisions using data that are collected from many experiments of relative wide range of reaction energies. These data include production of pions and heavier particles; like keons and lambda hyperons. Proton-proton collision is a simple system to investigate and to be considered a starting point that guides to more complicated processes of production in the proton-nucleus and the nucleus-nucleus collisions. In this pape...

    Quantum tele-amplification with a continuous variable superposition state

    Neergaard-Nielsen, Jonas S.; Eto, Yujiro; Lee, Chang-Woo; Jeong, Hyunseok; Sasaki, Masahide (2012)
    Optical coherent states are classical light fields with high purity, and are essential carriers of information in optical networks. If these states could be controlled in the quantum regime, allowing for their quantum superposition (referred to as a Schr\"odinger cat state), then novel quantum-enhanced functions such as coherent-state quantum computing (CSQC), quantum metrology, and a quantum repeater could be realized in the networks. Optical cat states are now routinely generated in the lab...
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