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In this paper, we consider the delay tolerable data traffic transmission in Heterogeneous Networks (HetNet) and propose a flow-level-delay constraint small cell sleeping scheme to achieve energy saving gain. We use the flow-level model to capture the process of data transmission in micro base station (BS) which is the small cell we consider. Our scheme takes advantage of the feature of HetNet and...
In this paper, a similarity transformation is presented to reduce the generalized (3+1)-dimensional (D) nonlinear Schrödinger equation (NLSE) with distributed coefficients to the related constant-coefficients (3+1)D NLSE. Some Jacobi elliptic function solutions are given by a generalized subequation method for the constant-coefficients equation. Thus some general solutions for the generalized (3+1)D...
Diesel traction Locomotives are widely used in railway tunnels in the plateau of China. Harmful gases given out by internal combustion engines must be excluded from the tunnel for human safety on railway. In the present study, nitrogen dioxide (NO2) was taken into account as a representative harmful pollutant of the investigation object. Natural ventilation of diluting the concentration of NO2 pollutant...
Among the diesel traction railway tunnels on Lhasa-Rikaze line of China, some of two tunnels are adjacent. When a train gets across a given tunnel, air pollutants extruded from the exit of the tunnel may diffuse towards the entrance of its neighboring tunnel and thus it results in thereof air pollution. The so-called cross pollution can affect the established ventilation scheme of excluding pollutants...
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