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A kind of non-invasive impedance cerebral blood monitor is designed on the basis of virtual instrument technology. The system realized the real-time collection and disposal of two-channel cerebral blood signals. Admittance encephaloloop (AEL) was composed of admittance encephalogram (AEG) and admittance differential encephaloloop (ADEG), and the parameters which reflected cirrhosis of cerebral arteries included drag index, elastic index, pouring index, fast inflow phase index and so on, which were calculated by AEL. The instrument can detect dual cerebral blood wave of the patients with real-time and dynamic stabilization. Non-invasive impedance cerebral blood monitor can detect difference between cerebrovascular patients and normal persons. It provides a convenient method for researching, preventing and epidemiological studies of cerebrovascular diseases in our country.

The present paper summarizes the technology and basic process for fabricating transparent ceramic MgAl2O4 spinel and introduces a scalable production technique. Fully transparent polycrystalline spinel has been prepared by combined vacuum sintering, hot-pressing, sintering in H2 atmosphere and hot isostatic pressing(HIP). The optical transmittance of the specimen sintered at 1500°C following HIP at 1800°C was nearly the same as that of single crystal spinel. When radiated by γ-ray and X- ray, colorless spinel became brown due to V-type color centers, which decreased its transmittance. On the other hand, the spinel ceramics’ resistance to radiation improved by doping CeO2.