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From the experimental dataset on the superconducting transition temperatures Tc for 31 different superconductors of the doping iron-based oxy-arsenide systems, rough set theory data preprocessing methods and back propagation neural network(BPNN) combined with genetic algorithm(GA) for its parameter optimization were proposed in this paper. A model for estimating the Tc's of the superconductors of...
Antenna selection provides a practical way to decrease system complexity and the hardware cost of radio frequency (RF) chains in MIMO system. In this paper, We propose an antenna selection scheme in the regenerative MIMO relaying scenario,which can achieve full diversity order of MIMO single relay network, and derive the diversity-multiplexing tradeoff(DMT) performance of the scheme. The algorithm...
The magnetic and specific-heat properties of the multiferroic YCrO3 chromites have been investigated in a temperature range of 2–300K. The results show that spin canted antiferromagnetic ordering of Cr3+ (S=3/2) around 140K. At elevated temperature all susceptibility follow the Curie-Weiss law and the corresponding effective magnetic moment µeff=3.99µB, which is closed to the theoretical value for...
Nontoxic lead-free magnetoelectric ceramics were successfully prepared by incorporating the dispersed ferromagnetic Ni-ferrite particles into (K0.5Na0.5)NbO3-based ferroelectric matrix. The multiferroicity of the ceramics were verified by P-E loops and magnetic hysteresis loops. Dielectric properties and magnetoelectric coefficients as a function of frequency were measured in the range of 100 Hz to...
The ytterbium orthochromate YbCrO3 has a strong anisotropic exchange interaction between Cr3+ and Yb3+ ions which makes the compound exhibits negative magnetization when magnetization-temperature curves are measured in a field-cooled mode with low applied field (100 Oe). YbCrO3 is a canted antiferromagnet (CAFM) below Néel temperature TN=118 K. To investigate the interaction between Cr3+ and Yb3+,...
We present a novel cooperative amplify-and-forward (AF) scheme for multi-access channel with two sources. The scheme achieves the maximum diversity order while keeping the loss of spectral efficiency as minimal as possible by allowing each source to transmit and relay simultaneously. It turns out that the diversity multiplexing tradeoff (DMT) achieved by the proposed protocol is very close to the...
In this paper, a dual-hop wireless cooperative network with opportunistic amplify-and-forward (AF) relaying is investigated over independent and non-identically distributed Nakagami-m fading channels. Due to the complicated form of the probability density function of the instantaneous dual-hop link signal-to-noise ratio (SNR), the symbol error rate and outage probability expressions are difficult...
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