7,735 research outputs found

    π\pi-J/ψJ/\psi Correlation and Elliptic Flow Parameter v2v_2 of Charmed Mesons at RHIC Energy

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    We study the correlation between the trigger π\pi and the associated J/ψJ/\psi on near and away sides in Au+Au collisions at sNN=200\sqrt{s_{NN}}=200 GeV. In the region of trigger momentum pt>4p_t>4 GeV/cc, the π\pi spectrum is composed of thermal-shower and shower-shower recombinations in the frame work of the recombination model. We consider the azimuthal anisotropy in the quenched hard parton distribution and then calculate the elliptic flow parameter v2v_2 of charmed mesons (J/ψJ/\psi, D0D^0 and DsD_s) for different centralities.Comment: 17 pages, 6 figure

    A Novel Three-Point Modulation Technique for Fractional-N Frequency Synthesizer Applications

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    This paper presents a novel three-point modulation technique for fractional-N frequency synthesizer applications. Convention modulated fractional-N frequency synthesizers suffer from quantization noise, which degrades not only the phase noise performance but also the modulation quality. To solve this problem, this work proposes a three-point modulation technique, which not only cancels the quantization noise, but also markedly boosts the channel switching speed. Measurements reveal that the implemented 2.4 GHz fractional-N frequency synthesizer using three-point modulation can achieve a 2.5 Mbps GFSK data rate with an FSK error rate of only 1.4 %. The phase noise is approximately -98 dBc/Hz at a frequency offset of 100 kHz. The channel switching time is only 1.1 μs with a frequency step of 80 MHz. Comparing with conventional two-point modulation, the proposed three-point modulation greatly improves the FSK error rate, phase noise and channel switching time by about 10 %, 30 dB and 126 μs, respectively

    Education and Scientific Research.

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    The New Drama and the Old Theater.

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