Hongzhen Cheng

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Soils at depths of 0 cm to 10 cm, 10 cm to 20 cm, and 20 cm to 40 cm from 37 vegetable greenhouses in Shandong Peninsula, East China, were collected, and 16 phthalic acid esters (PAEs) were detected using gas chromatography-mass spectrometry (GC-MS). All 16 PAEs could be detected in soils from vegetable greenhouses. The total of 16 PAEs (Σ16PAEs) ranged(More)
In this paper, we proposed a utility-based energy-efficient (UEE) resource allocation algorithm in downlink OFDMA heterogeneous networks (HetNets) with mixed traffic. The resource allocation problem is formulated as a mixed integer nonlinear programming (MINLP) problem first. Then an iterative algorithm is proposed to optimize the resource block (RB)(More)
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