Gao Junxia

Design and Implementation of Portable NMR Probe Magnet

The NMR’s probe consists of the static magnetic field generator (magnetic source) and the RF coil. It is very strict for the homogeneity of the static magnetic field intensity of the magnetic source, so the cost of the magnetic source is more expensive in the entire nuclear magnetic resonance instrument. The magnetic source generally consists of electromagnet, permanent magnet and superconducting magnet. The permanent magnet basically needs not to spend on operation and maintenance and its cost of manufacture is much cheaper than the superconducting magnet. Therefore, the permanent magnet may be the only choice for the static magnetic field device if we want to use the magnetic resonance instrument as an analyzer for production by reducing price. A new probe magnet was developed on the basis of the permanent magnet ring in this paper to provide a technological way for reducing the manufacturing cost, weight and volume of the existing nuclear magnetic resonance instrument (including MRI) probe.

Research and simulation of an improved Halbach arrays

Halbach array is new permanent structure. It was proposed by physicist Dr. K. Halbach of the U.S. Lawrence Berkeley National Laboratory. This paper proposes an improved magnet structure of Halbach array. By simulation of finite element software-Ansofts Maxwell, the results show that improved magnet structure can effectively improve the uniformity of the magnetic field within the array comparing with one-on-pole Halbach magnet array Composed by fan-based units.

Control system for high temperature and high pressure fluid-solid action

A control system for a high temperature and high pressure fluid-solid action furnace based on the self-revise PID was introduced. The hardware system was composed by an industrial computer, a servo and PLC system. Based on this hardware system the algorithm of the PID tuning was improved. Finally, this system functions were fulfilled of the control, self-revise PID and automatic temperature and pressure distribution. This system is already applied and can achieve the technical requirement.