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BackgroundThe quality of neutron radiographic images is mainly evaluated by human visual system (HVS), but HVS cannot be used as a real-time auxiliary for optimization parameters of neutron imaging systems.PurposeThis study aims to evaluate the quality of neutron radiographic images by no-reference image quality assessment (NR-IQA) and provide an effective approach for the parameters optimization of neutron imaging systems.MethodsFirstly, the plain natural images distorted with different distortion levels and types were labelled with quality scores to construct an experimental dataset by the gradient magnitude similarity deviation (GMSD) method. Then, the residual network (ResNet) model was employed to evaluate the quality of neutron radiographic images without reference images. Finally, the goal of extracting features and assessing the quality of neutron radiographic images was achieved by training the ResNet.ResultsThe model performs well in the test set of the experimental dataset and the quality prediction of the two group authentic neutron radiographic images.ConclusionsThe proposed quality assessment method could be used for the quality prediction of neutron radiographic images.

This paper investigated the influence of water-borne epoxy resin emulsion (WER) dosage on the properties of modified emulsified asphalt and analyzed the modification mechanism of WER on emulsified asphalt. Water-borne epoxy modified emulsified asphalt was used to prepare MS-2 micro-surfacing mixture, and dispersed demulsifier was introduced to improve the construction performance of the mixture. The best content of each component and the best asphalt -aggregate ratio were obtained through orthogonal test. The results show that 6% water-borne epoxy emulsion asphalt has the best compatibility and storage stability. With the increase of water-borne epoxy content, the low-temperature performance of water-borne epoxy emulsion asphalt becomes worse and the anti-aging performance increases. The optimum asphalt-aggregate ratio of MS-2 micro-surfacing is 7.5%. When the added water is 3%, the cement content is 1%, and the dispersed demulsifier content is 0.25%, the prepared micro-surfacing has good water damage resistance, rutting resistance, tensile strength and cohesiveness, which can meet the normal use requirements of pavement. [ABSTRACT FROM AUTHOR]