Two-dimensional honeycomb lattices show great potential in the realization of Dirac nodal line fermions(DNLFs).Here,we successfully synthesized a gold telluride(AuTe)monolayer by direct tellurizing an Au(111)substrate...Two-dimensional honeycomb lattices show great potential in the realization of Dirac nodal line fermions(DNLFs).Here,we successfully synthesized a gold telluride(AuTe)monolayer by direct tellurizing an Au(111)substrate.Low energy electron diffraction measurements reveal that it is(2×2)AuTe layer stacked onto(3×3)Au(111)substrate.Moreover,scanning tunneling microscopy images show that the AuTe layer has a honeycomb structure.Scanning transmission electron microscopy reveals that it is a single-atom layer.In addition,first-principles calculations demonstrate that the honeycomb AuTe monolayer exhibits Dirac nodal line features protected by mirror symmetry,which is validated by angle-resolved photoemission spectra.Our results establish that monolayer AuTe can be a good candidate to investigate 2D DNLFs and provides opportunities to realize high-speed low-dissipation devices.展开更多
目的检索、评价和整合肝癌患者围术期运动干预的最佳证据,为临床医护人员提供循证依据。方法按照“6S”证据资源金字塔模型,自上而下进行证据检索。数据库包括:BMJ Best Practice,UpToDate,国际指南协作网,美国国立指南网,英国国家卫生...目的检索、评价和整合肝癌患者围术期运动干预的最佳证据,为临床医护人员提供循证依据。方法按照“6S”证据资源金字塔模型,自上而下进行证据检索。数据库包括:BMJ Best Practice,UpToDate,国际指南协作网,美国国立指南网,英国国家卫生与临床优化研究所,苏格兰院际指南网,医脉通,Cochrane library,JBI循证卫生保健数据库,Web of Science,PubMed,Embase,CINAHL,SinoMed,中国知网,万方数据库,美国癌症协会,美国运动医学会,国际肝癌协会。时间为2010年1月至2022年6月。由2名研究者对纳入文献质量进行评价,并提取符合标准的文献证据。结果共纳入22篇文献,从运动的重要性、运动前评估、术前运动方案、术后运动方案、运动监测、健康教育、效果评价7个方面共总结出26条证据。结论本研究总结了肝癌患者围术期运动干预的最佳证据,可为临床医护人员循证护理实践提供证据。展开更多
贵州遵义铜锣井大型锰矿床位于鄂渝湘黔前陆褶皱冲断带西部,遵义次级成矿亚带的深溪-八里锰矿矿带。矿区主要出露地层为寒武系第三统-芙蓉统、奥陶系下统娄山关组,奥陶系下统桐梓组、红花园组、中-下统湄潭组,二叠系阳新统梁山组、栖霞...贵州遵义铜锣井大型锰矿床位于鄂渝湘黔前陆褶皱冲断带西部,遵义次级成矿亚带的深溪-八里锰矿矿带。矿区主要出露地层为寒武系第三统-芙蓉统、奥陶系下统娄山关组,奥陶系下统桐梓组、红花园组、中-下统湄潭组,二叠系阳新统梁山组、栖霞组、茅口组,乐平统龙潭组、长兴组地层,三叠系下统夜郎组、中-下统嘉陵江组、中统关岭组地层,第四系。锰矿体产于二叠系阳新统茅口组第三段含锰岩系下部,呈层状、似层状产出,矿石结构主要为内碎屑结构,纹层状、斑杂状、块状构造,矿体厚度与含锰岩系厚度呈正相关,矿体厚度为0.3~3.5 m, Mn品位为12%~31%,平均为19.27%。展开更多
Two-dimensional(2D)magnet/superconductor heterostructures can promote the design of artificial materials for exploring 2D physics and device applications by exotic proximity effects.However,plagued by the low Curie te...Two-dimensional(2D)magnet/superconductor heterostructures can promote the design of artificial materials for exploring 2D physics and device applications by exotic proximity effects.However,plagued by the low Curie temperature and instability in air,it is hard to realize practical applications for the reported layered magnetic materials at present.In this paper,we developed a space-confined chemical vapor deposition method to synthesize ultrathin air-stable ε-Fe_(2)O_(3) nanosheets with Curie temperature above 350 K.The ε-Fe_(2)O_(3)/NbSe_(2) heterojunction was constructed to study the magnetic proximity effect on the superconductivity of the NbSe_(2) multilayer.The electrical transport results show that the subtle proximity effect can modulate the interfacial spin–orbit interaction while undegrading the superconducting critical parameters.Our work paves the way to construct 2D heterojunctions with ultrathin nonlayered materials and layered van der Waals(vdW)materials for exploring new physical phenomena.展开更多
基金Project supported by the National Key R&D Program of China (Grant No.2018YFA0305800)the National Natural Science Foundation of China (Grant Nos.61925111,61888102,and 52102193)+2 种基金the Strategic Priority Research Program of Chinese Academy of Sciences (Grant Nos.XDB28000000 and XDB30000000)CAS Project for Young Scientists in Basic Research (Grant No.YSBR-003)the Fundamental Research Funds for the Central Universities。
文摘Two-dimensional honeycomb lattices show great potential in the realization of Dirac nodal line fermions(DNLFs).Here,we successfully synthesized a gold telluride(AuTe)monolayer by direct tellurizing an Au(111)substrate.Low energy electron diffraction measurements reveal that it is(2×2)AuTe layer stacked onto(3×3)Au(111)substrate.Moreover,scanning tunneling microscopy images show that the AuTe layer has a honeycomb structure.Scanning transmission electron microscopy reveals that it is a single-atom layer.In addition,first-principles calculations demonstrate that the honeycomb AuTe monolayer exhibits Dirac nodal line features protected by mirror symmetry,which is validated by angle-resolved photoemission spectra.Our results establish that monolayer AuTe can be a good candidate to investigate 2D DNLFs and provides opportunities to realize high-speed low-dissipation devices.
文摘目的检索、评价和整合肝癌患者围术期运动干预的最佳证据,为临床医护人员提供循证依据。方法按照“6S”证据资源金字塔模型,自上而下进行证据检索。数据库包括:BMJ Best Practice,UpToDate,国际指南协作网,美国国立指南网,英国国家卫生与临床优化研究所,苏格兰院际指南网,医脉通,Cochrane library,JBI循证卫生保健数据库,Web of Science,PubMed,Embase,CINAHL,SinoMed,中国知网,万方数据库,美国癌症协会,美国运动医学会,国际肝癌协会。时间为2010年1月至2022年6月。由2名研究者对纳入文献质量进行评价,并提取符合标准的文献证据。结果共纳入22篇文献,从运动的重要性、运动前评估、术前运动方案、术后运动方案、运动监测、健康教育、效果评价7个方面共总结出26条证据。结论本研究总结了肝癌患者围术期运动干预的最佳证据,可为临床医护人员循证护理实践提供证据。
文摘贵州遵义铜锣井大型锰矿床位于鄂渝湘黔前陆褶皱冲断带西部,遵义次级成矿亚带的深溪-八里锰矿矿带。矿区主要出露地层为寒武系第三统-芙蓉统、奥陶系下统娄山关组,奥陶系下统桐梓组、红花园组、中-下统湄潭组,二叠系阳新统梁山组、栖霞组、茅口组,乐平统龙潭组、长兴组地层,三叠系下统夜郎组、中-下统嘉陵江组、中统关岭组地层,第四系。锰矿体产于二叠系阳新统茅口组第三段含锰岩系下部,呈层状、似层状产出,矿石结构主要为内碎屑结构,纹层状、斑杂状、块状构造,矿体厚度与含锰岩系厚度呈正相关,矿体厚度为0.3~3.5 m, Mn品位为12%~31%,平均为19.27%。
基金The work is supported by the National Key Research and Development Program of China(Grant No.2022YFA1204104)the National Natural Science Foundation of China(Grant No.61888102)the Chinese Academy of Sciences(Grant Nos.ZDBS-SSW-WHC001 and XDB33030100).
文摘Two-dimensional(2D)magnet/superconductor heterostructures can promote the design of artificial materials for exploring 2D physics and device applications by exotic proximity effects.However,plagued by the low Curie temperature and instability in air,it is hard to realize practical applications for the reported layered magnetic materials at present.In this paper,we developed a space-confined chemical vapor deposition method to synthesize ultrathin air-stable ε-Fe_(2)O_(3) nanosheets with Curie temperature above 350 K.The ε-Fe_(2)O_(3)/NbSe_(2) heterojunction was constructed to study the magnetic proximity effect on the superconductivity of the NbSe_(2) multilayer.The electrical transport results show that the subtle proximity effect can modulate the interfacial spin–orbit interaction while undegrading the superconducting critical parameters.Our work paves the way to construct 2D heterojunctions with ultrathin nonlayered materials and layered van der Waals(vdW)materials for exploring new physical phenomena.
