目的研究腹型肥胖对骨质量、骨量的影响。方法本研究纳入2013年7月至2016年4月在南京医科大学第一附属医院老年内分泌科检查的中老年男性及绝经后女性,共计466人,排除其他影响骨代谢的疾病及药物。将男性腰围≥90 cm、女性腰围≥85 cm,...目的研究腹型肥胖对骨质量、骨量的影响。方法本研究纳入2013年7月至2016年4月在南京医科大学第一附属医院老年内分泌科检查的中老年男性及绝经后女性,共计466人,排除其他影响骨代谢的疾病及药物。将男性腰围≥90 cm、女性腰围≥85 cm,入选为腹型肥胖组,其余为对照组。男性腹型肥胖组共136名,年龄相当的男性对照组129名;女性腹型肥胖组共95名,年龄、绝经年龄、绝经年限相当的对照组106人。运用双能X线吸收检测法(dual energy X-ray absorptiometry,DXA)测定其股骨颈、全髋、腰椎骨密度(bone mineral density,BMD),采用TBS Insight软件测定其腰椎骨小梁分数(trabecular bone score,TBS),并测量身高、体质量、腰围及臀围,计算腰臀比(waist-to-hip ratio,WHR)、体质量指数(body mass index,BMI)。分析腹型肥胖组和对照组TBS、BMD的差异。结果中老年男性腹型肥胖组的股骨颈及全髋BMD均高于对照组[(0.79±0.11)g/cm^2vs.(0.76±0.12)g/cm^2、(0.94±0.14)g/cm^2vs.(0.90±0.12)g/cm^2,t=-2.021、-2.087,P=0.004、0.038)],腰椎BMD无变化(t=-0.703,P=0.483),而腰椎TBS低于对照组(1.27±0.09 vs.1.33±0.07,t=5.675,P<0.001)。与对照组相比,绝经后女性腹型肥胖组的股骨颈、全髋部及腰椎BMD差异均无统计学意义(t=-1.209、-1.367、-0.550,P=0.228、0.173、0.583),而腰椎TBS下降(1.22±0.09 vs.1.27±0.09,t=4.154,P<0.001)。结论腹型肥胖对中老年男性及绝经后女性骨量的影响存在性别、部位的差异,但对骨质量均产生不利影响。展开更多
We performed angle-resolved photoemission spectroscopy studies on a series of FeTe_(1-x)Se_x monolayer films grown on Sr TiO_3.The superconductivity of the films is robust and rather insensitive to the variations of t...We performed angle-resolved photoemission spectroscopy studies on a series of FeTe_(1-x)Se_x monolayer films grown on Sr TiO_3.The superconductivity of the films is robust and rather insensitive to the variations of the band position and effective mass caused by the substitution of Se by Te.However,the band gap between the electron-and hole-like bands at the Brillouin zone center decreases towards band inversion and parity exchange,which drive the system to a nontrivial topological state predicted by theoretical calculations.Our results provide a clear experimental indication that the FeTe_(1-x)Se_x monolayer materials are high-temperature connate topological superconductors in which band topology and superconductivity are integrated intrinsically.展开更多
The Hefei Advanced Light Facility(HALF)proposed by the National Synchrotron Radiation Laboratory(NSRL)is a diffraction-limited storage ring(DLSR),which plans to use a full energy linac as the injector.To ensure inject...The Hefei Advanced Light Facility(HALF)proposed by the National Synchrotron Radiation Laboratory(NSRL)is a diffraction-limited storage ring(DLSR),which plans to use a full energy linac as the injector.To ensure injection efficiency,the injection beam needs to have low emittance.Therefore,a photocathode radio frequency(RF)gun was developed in the HALF R&D project.The gun is designed to deliver high-quality electron bunches with a typically 0.5 nC charge and~4.5 MeV energy with low emittance.The initial system commission with an electron beam was completed at the end of 2020,and a stable 1.2–1.4 mm.mrad emittance with a bunch charge of 500 pC was demonstrated.In this paper,we report the experimental results and experience obtained during the commission,including the RF gun,drive laser system,and beam diagnostics.展开更多
文摘目的研究腹型肥胖对骨质量、骨量的影响。方法本研究纳入2013年7月至2016年4月在南京医科大学第一附属医院老年内分泌科检查的中老年男性及绝经后女性,共计466人,排除其他影响骨代谢的疾病及药物。将男性腰围≥90 cm、女性腰围≥85 cm,入选为腹型肥胖组,其余为对照组。男性腹型肥胖组共136名,年龄相当的男性对照组129名;女性腹型肥胖组共95名,年龄、绝经年龄、绝经年限相当的对照组106人。运用双能X线吸收检测法(dual energy X-ray absorptiometry,DXA)测定其股骨颈、全髋、腰椎骨密度(bone mineral density,BMD),采用TBS Insight软件测定其腰椎骨小梁分数(trabecular bone score,TBS),并测量身高、体质量、腰围及臀围,计算腰臀比(waist-to-hip ratio,WHR)、体质量指数(body mass index,BMI)。分析腹型肥胖组和对照组TBS、BMD的差异。结果中老年男性腹型肥胖组的股骨颈及全髋BMD均高于对照组[(0.79±0.11)g/cm^2vs.(0.76±0.12)g/cm^2、(0.94±0.14)g/cm^2vs.(0.90±0.12)g/cm^2,t=-2.021、-2.087,P=0.004、0.038)],腰椎BMD无变化(t=-0.703,P=0.483),而腰椎TBS低于对照组(1.27±0.09 vs.1.33±0.07,t=5.675,P<0.001)。与对照组相比,绝经后女性腹型肥胖组的股骨颈、全髋部及腰椎BMD差异均无统计学意义(t=-1.209、-1.367、-0.550,P=0.228、0.173、0.583),而腰椎TBS下降(1.22±0.09 vs.1.27±0.09,t=4.154,P<0.001)。结论腹型肥胖对中老年男性及绝经后女性骨量的影响存在性别、部位的差异,但对骨质量均产生不利影响。
基金supported by grants from the Ministry of Science and Technology of China(2015CB921000,2016YFA0401000,2015CB921301,2016YFA0300300)the National Natural Science Foundation of China(11574371,11274362,1190020,11334012,11274381,11674371)
文摘We performed angle-resolved photoemission spectroscopy studies on a series of FeTe_(1-x)Se_x monolayer films grown on Sr TiO_3.The superconductivity of the films is robust and rather insensitive to the variations of the band position and effective mass caused by the substitution of Se by Te.However,the band gap between the electron-and hole-like bands at the Brillouin zone center decreases towards band inversion and parity exchange,which drive the system to a nontrivial topological state predicted by theoretical calculations.Our results provide a clear experimental indication that the FeTe_(1-x)Se_x monolayer materials are high-temperature connate topological superconductors in which band topology and superconductivity are integrated intrinsically.
基金supported by Hefei Advanced Light Facility R&D project and the National Natural Science Foundation of China (No.11775216)
文摘The Hefei Advanced Light Facility(HALF)proposed by the National Synchrotron Radiation Laboratory(NSRL)is a diffraction-limited storage ring(DLSR),which plans to use a full energy linac as the injector.To ensure injection efficiency,the injection beam needs to have low emittance.Therefore,a photocathode radio frequency(RF)gun was developed in the HALF R&D project.The gun is designed to deliver high-quality electron bunches with a typically 0.5 nC charge and~4.5 MeV energy with low emittance.The initial system commission with an electron beam was completed at the end of 2020,and a stable 1.2–1.4 mm.mrad emittance with a bunch charge of 500 pC was demonstrated.In this paper,we report the experimental results and experience obtained during the commission,including the RF gun,drive laser system,and beam diagnostics.
