Peking University

Army Academy of Armored Forces of Pla

Shicheng Wei

Bo Wang

Lei Guo

Yifei Zhang

Xiaohong Zhang

Yongliang Li

Xiaochen Liu

Jie Wei

Yi Liang

Ping Zhou

Chengjie Wang

Yujiang Wang

Ye Zhu

Mengke Wang

The present invention discloses a visual ultrasonic nondestructive testing device and method for a deep/long-hole pipe. The device is composed of an ultrasonic measurement module, a mechanical motion module, a control module, and a coupling injection and assistance module. The ultrasonic measurement module includes an ultrasonic pulse transmitter/receiver, and the ultrasonic transmitter/receiver includes a high-speed analog/digital (A/D) converter; the mechanical motion module includes a scanning device, a probe and a holding device thereof, and a magnetic drive device. A scanning device can move in two directions, that is, an X-axis on which a magnetic driving wheel steps and a Y-axis on which a module body tests. During the scanning process, on the X-axis, a stepping motor drives a synchronous wheel-belt transmission, so that the magnetic driving wheel is rotated to achieve the purpose of stepping; on the Y-axis, a stepping motor on the module body drives the probe to reciprocate.

Visual ultrasonic nondestructive testing device and method for deep/long-hole pipe

The invention provides a device and the use thereof in a cell experiment in vitro. This device has a polydopamine layer-carboxymethyl chitosan layer-peptide layer structure, which is capable of regulating behaviors of human pluripotent stem cells and is useful in cell culture or a cell experiment in vitro.

Device and use thereof in cell experiments in vitro

This application provides a novel method for producing a tetracalcium phosphate-based fluorapatite. Also provided is a method of using the fluorapatite for repairing enamel defects.

Method for producing fluorapatite and its application

Growing community of inventors

Beijing, China

Shicheng Wei