Recent experiment shows that scandium （Sc） can make a good performance contact with carbon nanotubes （CNTs） to fabricate n-type field effect transistor （n-FET）. We study the Schottky barrier （SB） of scandium ...Recent experiment shows that scandium （Sc） can make a good performance contact with carbon nanotubes （CNTs） to fabricate n-type field effect transistor （n-FET）. We study the Schottky barrier （SB） of scandium （Sc） and palladium （Pd） with a （8,0） single-wall CNT （SWCNT） using first-principles calculation. It is found that the p-type SB height （SBH） of the Pd-CNT contact is about 0.34 eV, which is in good agreement with the experimental data. For the Sc-CNT contact, an n-type contact is formed and the SBH is about O.08eV in agreement with the experimental observations. Our calculation demonstrates that by contacting CNT with Pd and Sc, p-FET and n-FET can be fabricated, respectively. The dipole effect at the interface is used to explain our result.展开更多
目的:探讨21例性发育异常(disorders of sex development,DSD)患者临床特点,进一步提高对该病的认识与诊治水平。方法:回顾性分析2013年1月至2019年8月在广东省妇幼保健院妇科、小儿外科住院收治21例DSD患者临床资料。结果:XO/XY性腺发...目的:探讨21例性发育异常(disorders of sex development,DSD)患者临床特点,进一步提高对该病的认识与诊治水平。方法:回顾性分析2013年1月至2019年8月在广东省妇幼保健院妇科、小儿外科住院收治21例DSD患者临床资料。结果:XO/XY性腺发育不全2例,真两性畸形2例,克氏综合征1例,XY单纯性腺发育不全3例,先天性肾上腺皮质增生症6例,完全型雄激素不敏感综合征7例。主要以青春期后无月经来潮或外生殖器发育异常就诊。体查可见女性第二性征或者男性外生殖器发育不良。13例患者行腹腔镜检查术,其中11例行双侧性腺切除术,2例性腺活检。1例进行乙状结肠代阴道成形术,5例阴蒂矫形术。部分患者术后病理提示性腺肿瘤。大部分患者术后予激素治疗。结论:DSD患者临床表型具有高度异质性,需多学科临床医生团队协助诊治。DSD早发现早诊断对于决定性别后外生殖器整形及性腺处理有重要意义。展开更多
The non-equilibrium Green＇s function （NEGF） technique provides a solid foundation for the development of quantum mechanical simulators. However, the convergence is always of great concern. We present a general anal...The non-equilibrium Green＇s function （NEGF） technique provides a solid foundation for the development of quantum mechanical simulators. However, the convergence is always of great concern. We present a general analytical formalism to acquire the accurate derivative of electron density with respect to electrical potential in the framework of NEGF. This formalism not only provides physical insight on non-local quantum phenomena in device simulation, but also can be used to set up a new scheme in solving the Poisson equation to boost the performance of convergence when the NEGF and Poisson equations are solved self-consistently. This method is illustrated by a simple one-dimensional example of an N＋＋ N＋ N＋＋ resistor. The total simulation time and iteration number are largely reduced.展开更多
文摘Recent experiment shows that scandium （Sc） can make a good performance contact with carbon nanotubes （CNTs） to fabricate n-type field effect transistor （n-FET）. We study the Schottky barrier （SB） of scandium （Sc） and palladium （Pd） with a （8,0） single-wall CNT （SWCNT） using first-principles calculation. It is found that the p-type SB height （SBH） of the Pd-CNT contact is about 0.34 eV, which is in good agreement with the experimental data. For the Sc-CNT contact, an n-type contact is formed and the SBH is about O.08eV in agreement with the experimental observations. Our calculation demonstrates that by contacting CNT with Pd and Sc, p-FET and n-FET can be fabricated, respectively. The dipole effect at the interface is used to explain our result.
文摘目的:探讨21例性发育异常(disorders of sex development,DSD)患者临床特点,进一步提高对该病的认识与诊治水平。方法:回顾性分析2013年1月至2019年8月在广东省妇幼保健院妇科、小儿外科住院收治21例DSD患者临床资料。结果:XO/XY性腺发育不全2例,真两性畸形2例,克氏综合征1例,XY单纯性腺发育不全3例,先天性肾上腺皮质增生症6例,完全型雄激素不敏感综合征7例。主要以青春期后无月经来潮或外生殖器发育异常就诊。体查可见女性第二性征或者男性外生殖器发育不良。13例患者行腹腔镜检查术,其中11例行双侧性腺切除术,2例性腺活检。1例进行乙状结肠代阴道成形术,5例阴蒂矫形术。部分患者术后病理提示性腺肿瘤。大部分患者术后予激素治疗。结论:DSD患者临床表型具有高度异质性,需多学科临床医生团队协助诊治。DSD早发现早诊断对于决定性别后外生殖器整形及性腺处理有重要意义。
文摘The non-equilibrium Green＇s function （NEGF） technique provides a solid foundation for the development of quantum mechanical simulators. However, the convergence is always of great concern. We present a general analytical formalism to acquire the accurate derivative of electron density with respect to electrical potential in the framework of NEGF. This formalism not only provides physical insight on non-local quantum phenomena in device simulation, but also can be used to set up a new scheme in solving the Poisson equation to boost the performance of convergence when the NEGF and Poisson equations are solved self-consistently. This method is illustrated by a simple one-dimensional example of an N＋＋ N＋ N＋＋ resistor. The total simulation time and iteration number are largely reduced.
