Papers by Author: Ge Qin

Abstract: In heterogeneous turbine blades, multiple materials can be synthesized to provide better properties than any single material. In this paper, a new method for turbine blade modeling toward reverse engineering, termed as multi-color distance field, is presented. In this method, the material field describing the material composition continuous or discontinuous variation is associated with the signed distance field describing the geometry model. The method allows the designers to design and optimize no only the geometry but also the material composition of an object. Moreover, both the geometry model and the material information can be easily sliced to manufacture for the object represented using the associated multi-color distance field.

Abstract: In the treatment of nerve disorders, bio-electrodes are used to be implanted into the patients’ deep brain to provide electrical stimulation to improve the symptom and deep brain stimulation has been regarded as the most effective method to treat nerve disorders in clinic medicine. This paper presented a simple structure of bio-electrode implanted in deep brain for long term stimulation. Based on a 3D finite element modeling of electrostatics for the electrode, the influence of the electrode dimensions on the electric field distribution was discussed. The dimension and structure of the electrode was determined on the volume of tissue activated by deep brain stimulation.

Abstract: With the development of MEMS technology and its increasing applications in many engineering fields, the experimental research on micro-scale fluidic theory has become a spotlight topic in the past decade. In this paper, numerical and experimental investigations on the effects of roughness, compressibility and gas rarefaction on the nitrogen flow in rough microchannels had been investigated. Microchannels based on silicon substrates were fabricated by the MEMS process. Roughness surfaces of the microchannels had been obtained by KOH and TMAH solutions with different solubility etching on (100) silicon wafer. The quality of the microchannels was performed with a SEM and the measurements and the overall size of the microchannels were carried out with a step profiler. The Pyrex® 7740 and silicon wafers were packaged using the anodic bonding method. The testing platform was designed and fabricated, and checked for the gas sealing. Finally, the experimental device was constructed, and the results of gas flow in rough microchannels were measured.