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
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
目的:分析国际急性心肌梗死就医延迟的研究趋势和研究热点,为国内心肌梗死就医延迟研究提供参考。方法:借助CiteSpace 6.2.R4可视化分析软件对Web of Science(WoS)数据库中2002年1月1日—2022年12月31日急性心肌梗死就医延迟的相关研究...目的:分析国际急性心肌梗死就医延迟的研究趋势和研究热点,为国内心肌梗死就医延迟研究提供参考。方法:借助CiteSpace 6.2.R4可视化分析软件对Web of Science(WoS)数据库中2002年1月1日—2022年12月31日急性心肌梗死就医延迟的相关研究文献进行分析。结果:共纳入310篇文献,发文量总体呈上升趋势,发文量最多的国家是美国,主要研究机构为高等院校,各机构间合作紧密。结论:急性心肌梗死就医延迟研究领域主要集中于治疗方法和性别差异,未来研究热点可能是急性心肌梗死的质量管理。展开更多
AIM:To describe the design and clinical application of a corneal donor dehydrator which can quickly dehydrate corneas and keep its original shape.METHODS:The corneal donor material is placed on stainless steel beads w...AIM:To describe the design and clinical application of a corneal donor dehydrator which can quickly dehydrate corneas and keep its original shape.METHODS:The corneal donor material is placed on stainless steel beads with different diameters in the dehydrating box to make the cornea the same shape as the steel ball.Then,the cornea is placed inside the dehydrater for rapid dehydrating using the internal cleaning and ventilation system.Totally 83 eyes underwent deep anterior lamellar keratoplasty(DALK)using corneal donor tissue preserved with corneal dehydrater,and 60 patients(60 eyes)received DALK by the same surgeon using corneal donor tissue preserved with glycerol were included in the control group.The best corrected visual acuity(BCVA),the thickness and transparency of the corneal buttons were recorded.RESULTS:After the completion of dehydrating,all the donor corneas maintained a normal shape without any shrinkage or distortion,and the average intraoperative rehydration time was 43.3±12.1 s during operation.The mean BCVA of the dehydrater group was 0.30±0.18 at 1 wk and 0.32±0.16 at 1 mo,which were statistically better than that of the control group(P<0.001).The score of corneal buttons transparency were lower than that of the control group with statistical difference(P<0.001).The thickness of corneal buttons at 1 wk and at 1 mo in the dehydrater group was significantly better than that of the control group respectively(P<0.001).One week after operation,no corneal button turbidity or edema was observed in both groups.CONCLUSION:The dehydrater can quickly dehydrate the corneal material in a clean and airtight environment and maintain the original shape of the corneal donor during the dehydrating process.This dehydrater is recommended for long-term high-quality preservation in areas where corneal materials cannot be used within a reasonable time period.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。
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.
文摘目的:分析国际急性心肌梗死就医延迟的研究趋势和研究热点,为国内心肌梗死就医延迟研究提供参考。方法:借助CiteSpace 6.2.R4可视化分析软件对Web of Science(WoS)数据库中2002年1月1日—2022年12月31日急性心肌梗死就医延迟的相关研究文献进行分析。结果:共纳入310篇文献,发文量总体呈上升趋势,发文量最多的国家是美国,主要研究机构为高等院校,各机构间合作紧密。结论:急性心肌梗死就医延迟研究领域主要集中于治疗方法和性别差异,未来研究热点可能是急性心肌梗死的质量管理。
基金National Natural Science Foundation of China(No.81870639,No.82070923,No.81900907)Taishan Scholar Program(No.tspd20150215,No.tsqn201812150)the Academic Promotion Program of Shandong First Medical University(No.2019RC009)。
文摘AIM:To describe the design and clinical application of a corneal donor dehydrator which can quickly dehydrate corneas and keep its original shape.METHODS:The corneal donor material is placed on stainless steel beads with different diameters in the dehydrating box to make the cornea the same shape as the steel ball.Then,the cornea is placed inside the dehydrater for rapid dehydrating using the internal cleaning and ventilation system.Totally 83 eyes underwent deep anterior lamellar keratoplasty(DALK)using corneal donor tissue preserved with corneal dehydrater,and 60 patients(60 eyes)received DALK by the same surgeon using corneal donor tissue preserved with glycerol were included in the control group.The best corrected visual acuity(BCVA),the thickness and transparency of the corneal buttons were recorded.RESULTS:After the completion of dehydrating,all the donor corneas maintained a normal shape without any shrinkage or distortion,and the average intraoperative rehydration time was 43.3±12.1 s during operation.The mean BCVA of the dehydrater group was 0.30±0.18 at 1 wk and 0.32±0.16 at 1 mo,which were statistically better than that of the control group(P<0.001).The score of corneal buttons transparency were lower than that of the control group with statistical difference(P<0.001).The thickness of corneal buttons at 1 wk and at 1 mo in the dehydrater group was significantly better than that of the control group respectively(P<0.001).One week after operation,no corneal button turbidity or edema was observed in both groups.CONCLUSION:The dehydrater can quickly dehydrate the corneal material in a clean and airtight environment and maintain the original shape of the corneal donor during the dehydrating process.This dehydrater is recommended for long-term high-quality preservation in areas where corneal materials cannot be used within a reasonable time period.
