Parameter optimization method for light field 3D display.

A parameter optimization method for light field three-dimensional (3D) display is proposed to improve the performance of integral imaging (InI) and super multi-view (SMV) display. The parameters of light field display are divided into system parameters and display parameters. The multi-objective genetic algorithm is used to optimize the system parameters so that the display parameters can reach the target values. The influence of all display parameters on the imaging quality of light field 3D display are comprehensively considered. When the weight of the depth of field (DOF) and field of view (FOV) are set to the maximum, the DOF and FOV are respectively improved compared with the original display parameters. By setting the weight of resolution to the maximum, the image quality of InI and SMV is improved by 32% and 21%, respectively.

Effect of moisture on microwave ignition of bituminous coal.

The interaction between water and microwave is of vital importance to reveal the microwave ignition mechanism of water-bearing coal. This study used two group of bituminous coal after drying and water saturation treatment, for experimental testing and contrastive analysis. During the experiment, permeability of coal samples was obtained based on nuclear magnetic resonance(NMR) test, then different power of microwaves were applied to coal samples, and the occurrence of hot spots within coal samples was regarded as a sign of microwave ignition. Microwave ignition of water-saturated coal is mainly affected by microwave power and coal permeability. The pore water in low permeability coal is conducive to microwave ignition, while the pore water in high permeability coal will prolong the ignition time. There is a permeability threshold, above which the average ignition time of water-saturated coal samples is longer than that of dry coal samples, but below which the opposite is true. These insights can be used to evaluate the safety of microwave technology when applied to coal engineering.

Molecular understanding of charge effect on desalination performance in lamellar MoS2 membranes.

Due to its advantages of superior oxidation resistance, excellent chemical stability and non-toxicity, molybdenum disulfide (MoS2) has shown prospects in seawater desalination applications. In this manuscript, molecular dynamics (MD) simulation has been employed to explore the effect of charge distribution in MoS2 nanosheets on the desalination performance of the lamellar MoS2 membrane. It is found that the model considering the atomic charge better describes the transport behavior of salt solution in the membranes. The water flux passing through the lamellar MoS2 membrane would be influenced little by the atomic charges in the MoS2 nanosheet. The lamellar MoS2 membrane considering the atomic charge distribution shows a screening effect between Na+ and Cl- ions.

Effects of Microwave Heating Paths on Pores and Cracks in Bituminous Coal.

To follow the effect of the microwave heating path on the structure of coal, eight 50 mm diameter, 30 mm long dry coal cores from the same coal seam with similar pore structure characteristics were microwave-treated using 4 pathways. The T 2 spectrum, pore-volume, temperature, mass, and visual changes of coal samples were analyzed before and after microwave heating. The microwave heating path affected the macropores and microcracks and the crack development mode. When the same microwave energy was applied, microwave heating on the coal was mainly manifested by the opening of closed pores, before the pyrolysis temperature of the coal was reached. Increasing the energy density caused the water vapor to move from constant pressure expansion to constant volume expansion. This resulted in an exponential growth of the mesopore and macropore volumes. Meanwhile, the micropore volume increased due to the collapse of pore structures. As a result, high-power microwave heating could accelerate the vaporization rate of water. The rapid expansion of water vapor volume brought about a microwave heating effect similar to the "steam explosion". The resulting local tensile stress enabled the cracks to develop, expand, and connect to others continuously. Thus, it formed a complex crack network leading to the outside of the coal sample.