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RISS 인기검색어
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- 저자 : Yan Zhengguo (검색결과 2 건)
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Wen Tianpeng,Yuan Lei,Yan Zhengguo,Jin Yao,Liu Zhaoyang,Yu Jingkun 한국물리학회 2022 Current Applied Physics Vol.39 No.-
The present work looked at the co-doping effect of the typical trivalent metal oxides on the electrochemical performance of 8 mol% of MgO stabilized ZrO2 (Mg-PSZ) electrolyte ceramics used for oxygen sensors. An appreciable increase in the ionic conductivity occurred on substituting MgO with trivalent metal oxides except La2O3 in the Mg-PSZ electrolyte ceramics across the measured temperature range. The conductivity was related to the co-dopant ionic radius and the ionic conductivity increased with the co-dopant ionic radius of the trivalent metal oxides, reached a maximum at about 1.02 Å, and thereafter decreased. Through comparison and analysis, the Y2O3 exhibited excellent superiority than other trivalent metal oxides and the oxygen sensor assembled by 1Y7Mg-PSZ electrolyte possessed more excellent response speed and stability.
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Luo Huang,Zhicong Li,Jing Yan,Lunqiu Chen,Zhengguo Piao 대한악안면성형재건외과학회 2021 Maxillofacial Plastic Reconstructive Surgery Vol.43 No.-
Objectives: The purpose of this study was to compare differences in facial soft tissue thickness in three-dimensional(3D) images before and after orthognathic surgery in patients with skeletal Class III malocclusion and to obtain a betterunderstanding of the relationship between hard and soft tissue changes after surgery. Materials and method: The present retrospective study included 31 patients with skeletal Class III malocclusion withmandibular chin deviation greater than 4 mm who had undergone cone-beam computed tomography before and 6months after surgery. Seven bilateral points were established. Measurements were taken from software-generatedmultiplanar reconstructions. The predictor variables were timing (pre- and postoperatively) and side (deviated vs. nondedicated). A regression model and correlation analysis were conducted for statistical analysis. Results: The difference of bilateral facial soft tissue thickness was statistically significantly different between deviatedand nondeviated sides (P < 0.05), with lower values observed on the deviated side. The soft tissue thickness hasbecome nearly symmetric at local regions of the lower thirds of the face after orthognathic surgery. However, mostmeasurements showed a negative correlation between changes in soft tissue thickness and changes in bone tissues. Conclusions: Skeletal Class III malocclusion with facial asymmetry is accompanied by differences in soft tissuethickness when comparing Dev and N-Dev sides of the posterior region of the mandible, where soft tissues are thinneron the Dev side. Soft tissue thickness can compensate for or camouflage the underlying asymmetric mandible. Inaddition, the asymmetric soft tissue thickness on the lower third of the face can be partially improved by orthognathicsurgery, but the amount of soft tissue thickness change is not consistent with that of hard tissue positional change.
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