研究了由层状的离子导电固体磷酸氢双氧铀 HUO_2PO_4·4H_2O(HUP)作为发光介质的电致发光盒。在交流激发下,可以看到双氧铀和氮等离子体的发射,而前者发光是由后者激发的;双氧铀的 EL 光谱和它的光致发光光谱一致。类似的结果还可以...研究了由层状的离子导电固体磷酸氢双氧铀 HUO_2PO_4·4H_2O(HUP)作为发光介质的电致发光盒。在交流激发下,可以看到双氧铀和氮等离子体的发射,而前者发光是由后者激发的;双氧铀的 EL 光谱和它的光致发光光谱一致。类似的结果还可以从 HUP 被 Na,Mg 和吡啶完全取代 H 的衍生物 NaUP,Mg0.5UP 和 pyHUP 中看到。对所有这些固体,确定了它的 EL 发光强度对样品厚度,交流电频率和使用电压之间的依赖关系.典型的使用条件是1.5—3.0kV,0.2—4kHz.展开更多
A service life model of NAND flash and threshold voltage shift process is proposed to calculate the service life and endurance.The relationships among achievable program/erase(P/E) cycles,recovery time,bad block rate ...A service life model of NAND flash and threshold voltage shift process is proposed to calculate the service life and endurance.The relationships among achievable program/erase(P/E) cycles,recovery time,bad block rate and storage time are analyzed.The achievable endurance and service life of a NAND flash are evaluated based on a flash cell degradation and recovery model by varying recovery time,badblock rate,and storage time.It is proposed to improve the service lifetime of solid state disk by both relaxing the bad block rate limitation and retention time while extending the recovery time.The results indicate that endurance can be improved by 17 times if the storage time guarantee is reduced from 10 a to 1 a with 105 s recovery time inserted between cycles.展开更多
基金Project(61171017)supported by the National Natural Science Foundation of China
文摘A service life model of NAND flash and threshold voltage shift process is proposed to calculate the service life and endurance.The relationships among achievable program/erase(P/E) cycles,recovery time,bad block rate and storage time are analyzed.The achievable endurance and service life of a NAND flash are evaluated based on a flash cell degradation and recovery model by varying recovery time,badblock rate,and storage time.It is proposed to improve the service lifetime of solid state disk by both relaxing the bad block rate limitation and retention time while extending the recovery time.The results indicate that endurance can be improved by 17 times if the storage time guarantee is reduced from 10 a to 1 a with 105 s recovery time inserted between cycles.
