Xuzhou Institute of Technology

About: Xuzhou Institute of Technology is a education organization based out in Xuzhou, China. It is known for research contribution in the topics: Catalysis & Computer science. The organization has 1696 authors who have published 1521 publications receiving 13541 citations.

RBF neural network multi-step predictive control for nonlinear systems

Abstract: Aim at solving the strong nonlinear control problem,a multi-step predictive control method is proposed,which uses a RBF neural network as a model.A multi-step predictive model is constructed,a Jacobian matrix computing method for predictive error about control sequence is given,a receding horizon optimization policy is designed by using L-M algorithm,feedback correction is achieved by modifying reference input according the error,and the stability of the system is proved.Simulation results of the control method validate desirable performances.

Multiview Ghost-Free Image Enhancement for In-the-Wild Images With Unknown Exposure and Geometry

Abstract: The multiview low dynamic range images captured with sparse camera arrangement under ill-lighting conditions contain highlighted and shadow regions due to over-exposed and under-exposed regions The processing of these images produces contrast distortion, and it is challenging to maintain relative brightness with color consistency Moreover, the disparity map estimation faces the challenges of holes and artifacts due to a wide baseline and poor visibility, with a shared view of vision In this article, we propose a multiview ghost-free image enhancement strategy for in-the-wild images with unknown exposure and geometry We address the complex geometric alignment problem for a wide variational baseline among multiple sparsely arranged cameras The features among multiple viewpoints are detected and matched for the image restoration The restored image contains highlighted and shadow regions with a color imbalance problem We synthesize virtual images following the intensity mapping function, which compensates for the relative brightness and color distortions Finally, we fuse all the images to obtain high-quality images The proposed method is more frequent and feasible for future multiview systems with varying baselines without relying on disparity maps The experimental results demonstrate that the proposed method outperformed the state-of-the-art approaches

Wavelengths, transition probabilities, and oscillator strengths for M-shell transitions in tungsten ions with partially filled 3p subshell

Abstract: Wavelengths, transition probabilities, and oscillator strengths have been calculated for M-shell electric dipole (E1) transitions in Al-like W61+ through Cl-like W57+, with partially filled 3p subshell. The fully relativistic multiconfiguration Dirac–Fock (MCDF) method, taking quantum electrodynamical effect and Breit correction into account, was used in the calculations. Calculated energy levels of M-shell excited states in Al-like through Cl-like W ions from the method were compared with some available theoretical and experimental results, and good agreement with them was achieved.

Experimental Study on Water-Sand Seepage Characteristics in Fractured Rock Mass under Rheological Effect

Abstract: This study investigates water-sand bursting disasters associated with fractured rock that affect safe mining in the mining areas of Western China. A broken rock water-sand seepage rheological test device was developed, and rheological tests were conducted on multiple groups of broken rock samples with single-stage axial loading and different load levels. When the rheology of each group of broken rock samples was stable, water-sand mixed fluid was injected into the samples at a certain pressure gradient to conduct water-sand seepage tests on broken rock masses. It was found that when the porosity of a fractured rock mass is within a certain range, the water-sand mixed fluid does not completely pass through the fractured rock mass and some sand particles are filtered by the fractured rock sample. There is an exponential relationship between the sand breaking ability and the sand filtration ability of fractured rock and its initial porosity, and the permeability of fractured rock decreases by a certain extent after sand filtration. However, for different load levels, when the flow through a fractured rock mass tends to be stable, the final porosity of the fractured rock mass decreases exponentially with axial compression. Based on the classical Kelvin rheological model and the basic theory of fractional calculus, a new fractional rheological model has been proposed and the rheological parameters under different load levels were fitted to the model. The new fractional rheological model is better able to describe the rheological characteristics of broken mudstone.

Experimental Study of Thermal Expansion Characteristics of Coaly Mudstone at High Temperatures

Abstract: This study investigated the thermal expansion characteristics of coaly mudstone specimens at temperatures ranging from room temperature up to 800 °C. The experiments were performed by an MTS810 electro-hydraulic servo system and an MTS653.02 high-temperature furnace. Results revealed that mudstone experienced thermal expansion at high temperature, and that the relationship curve between thermal expansion strain and testing time could be divided into three stages. With increasing temperature, mudstone’s thermal strain and expansion coefficient exhibited an upward trend. With 400 °C as the critical temperature, the curve could be divided into (1) rapid increase stage, (2) flat stage, and (3) rapid increase stage. The major causes behind thermal expansion are changes in internal pores and fissure, as well as the thermochemistry effect of mineral components.