Stretchable alternating-current electroluminescent (ACEL) devices are required due to their potential in wearable, biomedical, e-skin, robotic, lighting, and display applications; however, one of the main hurdles is to achieve uniform electroluminescence with an optimal combination of transparency, conductivity, and stretchability in electrodes. We therefore propose a fabrication scheme involving strategically combining two-dimensional graphene layers with a silver nanowire (Ag NW)-embedded PEDOT:PSS film. The developed hybrid electrode overcomes the limitations of commonly known metallic NWs and ionic conductorbased electrodes for ACEL applications. Furthermore, the potential of the hybrid electrode is realized in demonstrating large-area stretchable ACEL devices composed of an 8 × 8 passive array. The prototype ACEL passive array demonstrates efficient and uniform electroluminescence under high levels of mechanical deformation such as bending, rolling, twisting, and stretching.
(18)F-FDG uptake of gastric cancer is an independent and significant prognostic factor for tumour recurrence. (18)F-FDG PET/CT could provide effective information on the prognosis after surgical resection of gastric cancer, especially in tubular adenocarcinoma and poorly differentiated adenocarcinoma.
The reverse transformation mechanism of martensite to austenite and the volume fraction of retained austenite have been studied in an Fe ± 3Si ± 13Cr ± 7Ni (wt-%) martensitic stainless steel by means of dilatometry, transmission electron microscopy and X-ray diffraction. Below a heating rate of 10 K s 1 , the reverse transformation of a' to c occurs by diffusion, whereas it occurs by a diffusionless shear mechanism above 10 K s 1 . After reversion treatment at low temperatures, ® lmlike retained austenite is observed along a' lath boundaries, while reversion treatment at high temperatures produces granular retained austenite inside the a' laths in addition to ® lmlike retained austenite. The volume fraction of retained austenite at room temperature increases with increasing reversion treatment temperature, exhibiting a maximum at~625°C, above which it decreases with increasing reversion temperature.
MST/5353Professor Lee (yklee@yonsei.ac.kr) is in the
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