Bingyu Xu

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SrWO4:Ln3+ (Ln = Eu, Ce, and Tb) nanocrystals were successfully synthesized by a hydrothermal method, and were characterized by X-ray diffraction, transmission electron microscopy, and scanning electron microscopy. The results indicated that the crystalline size of nanocrystals decreases with increasing Eu3+ concentrations and increases with increasing(More)
This paper considers a hybrid heterogeneous network (HetNet), where macro cells adopt massive multiple-input multiple-output (MIMO), and small cells adopt millimeter wave (mmWave) transmissions. We assume that all base stations (BSs) are solely powered by the renewable energy. The implementation of these emerging techniques has a substantial effect on the(More)
This paper focuses on user association (UA) in energy- cooperation enabled heterogeneous networks (HetNets). Energy-cooperation enables energy to be transferred between base stations (BSs), which can reduce the unnecessary offloading and mitigate the signaling cost and the interference. However, some of the energy will be lost during the energy transfer(More)
In this paper, TiO2-Bi2S3 and TiO2-Bi2S3:Eu(3+) composite photoanodes were successfully designed, which can not only fully absorb visible light but also transfer the electron from Bi2S3 to TiO2 conduction band due to the narrow band gap and high conduction band of Bi2S3. Compared to pure TiO2 cell, the photoelectric conversion efficiencies of TiO2-Bi2S3 and(More)
MoO2/Mo4O11 and MoO2/MoS2 composite nanorods were successfully synthesized by reducing MoO3 nanorods. The adsorption performance of samples was evaluated by using Rhodamine B (RhB) and metal ions in aqueous solutions as the targets. The results indicated that the obtained MoO2/Mo4O11 and MoO2/MoS2 composite nanorods can present excellent adsorption(More)
In the conventional cellular network, each base station (BS) manages its own energy consumption. When a BS lacks sufficient energy, user equipments (UEs) have to be offloaded to the other BSs which leads to higher signaling cost and lower throughput. Energy cooperation schemes allow energy to be transferred among BSs through power grids which reducing the(More)
One-dimensional SrWO4:Eu(3+) nanostructures were prepared by a hydrothermal method. The structures and morphologies of the nanocrystals were characterized by X-ray diffraction, Raman spectroscopy, transmission electron microscopy, and scanning electron microscopy. The results indicated that the phase compositions, morphologies and sizes and luminescence(More)
In LTE cellular networks, the pathloss impacts the performance of the uplink channel power control. Therefore, power control algorithms can achieve good performance on the location where user equipment (UE) is not power limited. The baseline parameter setting of the fractional pathloss power control is valid for some scenarios, however, it is a challenging(More)
Y(OH)3:Eu(3+) nanotubes were synthesized by a facile hydrothermal method first, and then Au particles were grown on the surface of Y2O3:Eu(3+) nanotubes by combining the vacuum extraction method and the annealing process. The composite nanotubes were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray photoelectron(More)