Achieving excellent energy storage performance with thermal stability in lead-free AgNbO3 ceramics.

Large hysteresis and low energy density of pure AgNbO3 ceramics limit their further application in pulsed power techniques. Here, less-harmful Sm2O3-modified AgNbO3 antiferroelectric ceramics were synthesized by a rolling process, in order to improve the energy storage performance. All the Sm2O3-doped samples display reduced hysteresis due to disrupted long-range order, as certified by Raman spectra. As expected, due to the large dielectric breakdown strength and reduced hysteresis, an improved energy storage density, Wrec, of 5.85 J cm-3 and satisfactory energy efficiency, η, of 77% can be simultaneously achieved in the studied antiferroelectric ceramics, showing great superiority over other bulk electronic ceramics. Along with excellent temperature stability within the range of 20-150 °C at 320 kV cm-1 (Wrec > 4.3 J cm-3, with minimal variation of ≤4%) in the studied samples, this shows that AgNbO3-based environmentally friendly ceramics are promising materials for pulsed power techniques.

[EFFECTIVENESS EVALUATION OF FACIAL METICULOUS FAT GRAFTING BY FAT GRANULES INJECTION ASISTOR].

OBJECTIVE: To study the effectiveness of facial meticulous fat grafting by fat granules injection asistor. METHODS: Between January and August 2015, 46 patients received facial autologous fat grafting for rejuvenation. There were 7 males and 39 females, aged 21-65 years (mean, 34 years). Firstly, the faces were divided into 10 cosmetic zonations according to facial aesthetic criteria, then autologous fat grafting was carried out by fat granules injection asistor. The autologous fat was filled into 1, 2, 3, 4, 5, 6, 7, 8, and 9 cosmetic zonations in 3, 7, 5, 3, 8, 4, 2, 10, and 4 cases respectively; the injected fat amount was 2-110 mL (mean, 47 mL). RESULTS: The swelling period was from 5 to 15 days after operation (mean, 7 days), and there were no complications of infection, cyst, introvascular thrombogenesis, and so on. They were followed up 1-7 months (mean, 3 months). The effect of face rejuvenation was satisfactory. CONCLUSIONS: Cosmetic zonation of face is helpful for preoperative evaluation of autologous fat grafting, and the fat granules injection asistor is beneficial to reach better effect of face rejuvenation.