Abstract: A material layered conveying device based on a disassembly line, including a front section conveyor belt, a rear section conveyor belt, and a lower conveyor belt. An interval between the front and rear section conveyor belts is provided with two sets of movable conveyor belts arranged in side by side parallel, a lifting conveyor belt is provided below the interval and adjacent to and horizontal with the lower conveyor belt, and a lifting conveyor belt elevator is provided under the lifting conveyor belt. The lifting conveyor belt is driven vertically up, and the lifting conveyor belt is horizontal with the front and rear section conveyor belts when the lifting conveyor belt is moved to a maximum distance. The device adopts the movable dual conveyor belts of the respective levels of the upper and lower conveyor belts, and can achieve synchronous high-low transferring of the material when the material is conveyed.

Abstract: A spiral ultrasonic tomography imaging method and system are provided. The method is to use synchronous rotation of an ultrasonic probe or cyclic switching of emission array elements in the ultrasonic probe under the premise of a uniform displacement of the ultrasonic probe along the Z axis, so that the change trajectory of the positions of emission array elements over time in a three-dimensional space at each ultrasonic emission time is distributed along a spiral line or a curve. During the process of the uniform displacement of the ultrasonic probe along the Z axis, the ultrasonic probe emits ultrasonic waves and receives and collects echo data. The collected echo data is stored and post-processed to realize ultrasonic tomography imaging of an object. The spiral ultrasonic tomography three-dimensional scanning method and the corresponding system realize rapid continuous uninterrupted data acquisition to ensure that higher spatial resolution in the Z-axis direction.

Abstract: A two-stage method for a double-row intelligent layout of a workshop based on multiple constraints. The minimum logistics cost function of the double-row intelligent layout is established as the objective function, and the constraints of the function model are established at the same time, to generate the LP model. The initial population of facilities is generated, and the fitness value of each individual in the initial population is calculated according to the LP model, so that the fitness value is used as the current optimal solution. The individual in the initial population is continuously optimized by using the VNS and PMX technologies, and the value of the objective function and optimal sequence of the optimal solution are updated by using the elite retention strategy.

Abstract: The disclosure is related to the technical field of functional imaging, and discloses an ultrasound CT image reconstruction method and system based on ray theory, wherein the method includes an ultrasound CT sound speed reconstruction method and an ultrasound CT attenuation coefficient reconstruction method based on ray theory; the ultrasound CT sound speed reconstruction method based on ray theory includes: (1) extraction of the difference in travel time; (2) calculate the ray path that the acoustic wave passes from the transmitting array element to the receiving array element; (3) solution for inverse problem: by using the quasi-Newton method to solve the path-slowness-time equation system, the speed reconstruction value vector of the object to be measured can be obtained.