Conventional theories expect that materials under pressure exhibit expanded valence and conduction bands,leading to increased electrical conductivity.Here,we report the electrical properties of the doped 1T-TiS_(2) un...Conventional theories expect that materials under pressure exhibit expanded valence and conduction bands,leading to increased electrical conductivity.Here,we report the electrical properties of the doped 1T-TiS_(2) under high pressure by electrical resistance investigations,synchrotron x-ray diffraction,Raman scattering and theoretical calculations.Up to 70 GPa,an unusual metal-semiconductor-metal transition occurs.Our first-principles calculations suggest that the observed anti-Wilson transition from metal to semiconductor at 17 GPa is due to the electron localization induced by the intercalated Ti atoms.This electron localization is attributed to the strengthened coupling between the doped Ti atoms and S atoms,and the Anderson localization arising from the disordered intercalation.At pressures exceeding 30.5 GPa,the doped TiS_(2) undergoes a re-metallization transition initiated by a crystal structure phase transition.We assign the most probable space group as P2_(1)2_(1)2_(1).Our findings suggest that materials probably will eventually undergo the Wilson transition when subjected to sufficient pressure.展开更多
目的对比腹腔镜开窗引流术与B超引导下穿刺硬化术治疗肝囊肿的临床疗效。方法回顾性分析上海中医药大学附属曙光医院2013年1月至2018年1月收治的肝囊肿患者168例,按治疗方式分为腹腔镜开窗引流组(n=82)和B超引导下穿刺硬化组(n=86)。比...目的对比腹腔镜开窗引流术与B超引导下穿刺硬化术治疗肝囊肿的临床疗效。方法回顾性分析上海中医药大学附属曙光医院2013年1月至2018年1月收治的肝囊肿患者168例,按治疗方式分为腹腔镜开窗引流组(n=82)和B超引导下穿刺硬化组(n=86)。比较两组患者手术时间、出血量、术后下床活动时间、住院时间和治疗效果。结果 B超引导下穿刺硬化组患者术后下床活动时间更早[(3.12±0.26)d vs(4.2±1.2)d,P<0.05]。术后12个月腹腔镜开窗引流组患者治愈率(囊肿完全消失)明显高于B超引导下穿刺硬化组[79.27%(65/82) vs 65.12%(56/86),P<0.05],两组患者手术时间、出血量、住院时间、总治疗有效率无统计学差异(P>0.05)。结论腹腔镜开窗引流术和B超引导下穿刺硬化术对肝囊肿均安全有效;腹腔镜开窗术患者治愈率更高,而B超穿刺硬化术患者术后能更早下床活动。展开更多
基金supported by the National Natural Science Foundation of China (Grant No. 12304072)Program for Science and Technology Innovation Team in Zhejiang (Grant No. 2021R01004)+1 种基金Natural Science Foundation of Ningbo(Grant No. 2021J121)supported by the User Experiment Assist System of Shanghai Synchrotron Radiation Facility (SSRF)。
文摘Conventional theories expect that materials under pressure exhibit expanded valence and conduction bands,leading to increased electrical conductivity.Here,we report the electrical properties of the doped 1T-TiS_(2) under high pressure by electrical resistance investigations,synchrotron x-ray diffraction,Raman scattering and theoretical calculations.Up to 70 GPa,an unusual metal-semiconductor-metal transition occurs.Our first-principles calculations suggest that the observed anti-Wilson transition from metal to semiconductor at 17 GPa is due to the electron localization induced by the intercalated Ti atoms.This electron localization is attributed to the strengthened coupling between the doped Ti atoms and S atoms,and the Anderson localization arising from the disordered intercalation.At pressures exceeding 30.5 GPa,the doped TiS_(2) undergoes a re-metallization transition initiated by a crystal structure phase transition.We assign the most probable space group as P2_(1)2_(1)2_(1).Our findings suggest that materials probably will eventually undergo the Wilson transition when subjected to sufficient pressure.
文摘目的对比腹腔镜开窗引流术与B超引导下穿刺硬化术治疗肝囊肿的临床疗效。方法回顾性分析上海中医药大学附属曙光医院2013年1月至2018年1月收治的肝囊肿患者168例,按治疗方式分为腹腔镜开窗引流组(n=82)和B超引导下穿刺硬化组(n=86)。比较两组患者手术时间、出血量、术后下床活动时间、住院时间和治疗效果。结果 B超引导下穿刺硬化组患者术后下床活动时间更早[(3.12±0.26)d vs(4.2±1.2)d,P<0.05]。术后12个月腹腔镜开窗引流组患者治愈率(囊肿完全消失)明显高于B超引导下穿刺硬化组[79.27%(65/82) vs 65.12%(56/86),P<0.05],两组患者手术时间、出血量、住院时间、总治疗有效率无统计学差异(P>0.05)。结论腹腔镜开窗引流术和B超引导下穿刺硬化术对肝囊肿均安全有效;腹腔镜开窗术患者治愈率更高,而B超穿刺硬化术患者术后能更早下床活动。
