Aerator is an important device for release works of hydraulic structures with high-speed flow in order to protect them from cavitation damage. This kind of protecting effect is related closely to cavity length below t...Aerator is an important device for release works of hydraulic structures with high-speed flow in order to protect them from cavitation damage. This kind of protecting effect is related closely to cavity length below the aerator, while the cavity length is dominated by the emergence angle over the aerator. Therefore it is crucial to determine this angle accurately. In the present paper the affecting intensities of flow depth and the fluctuating velocity on this angle were analyzed through two introduced parameters. Furthermore, the improved expressions of emergence angle estimation, for both ramp-type and step-type aerators, were presented by means of 68 sets of experimental data from 6 projects based on error theory. The results showed that the present method has higher accuracy than the previously reported methods.展开更多
The Trendelenburg position and reverse Trendelenburg position are frequently employed during lower abdominal surgery to achieve optimal surgical field visualization and complete exposure of the operative site, particu...The Trendelenburg position and reverse Trendelenburg position are frequently employed during lower abdominal surgery to achieve optimal surgical field visualization and complete exposure of the operative site, particularly under pneumoperitoneum conditions. However, these positions can have significant impacts on the patient’s physiological functions. This article overviews the historical background of Trendelenburg position and reverse Trendelenbury position, their effects on various physiological functions, recent advancements in their clinical applications, and strategies for preventing and managing associated complications.展开更多
Synthetic silicides with good properties were prepared,as Y ions were implanted into silicon using metal vapor vacuum arc (MEVVA) ion implantor and annealed by Rapid Thermal Annealing (RTA).The structure of synthetic ...Synthetic silicides with good properties were prepared,as Y ions were implanted into silicon using metal vapor vacuum arc (MEVVA) ion implantor and annealed by Rapid Thermal Annealing (RTA).The structure of synthetic silicides has been investigated with the analysis of channeled low angle emergence and TEM.Three layers could be observed in the implanted region as the implanting ion flux is selected as 25μA/cm\+2.The thickness of the silicide layer is about 60—80nm.The defect density N \-d and sheet resistance R \-s decrease with the increase of the ion flux.After RTA annealing of the implanted sample,the N\-d and R\-s decreased obviously.R\-s decreased from 54Ω/□ to 14Ω/□.The minimum of resistivity is 84μΩ·cm.It is evident that electrical properties of the Y silicides can be improved by RTA.The formation of the silicides with YSi and YSi\-2 are confirmed by X\|ray diffraction (XRD) analysis.With the analysis of low angle emergence,important information exposed from the depth profiles of atoms and lattice distortion in an implanted region would be used to study the synthesis of silicides.展开更多
基金supported by the National Natural Science Foundation of China (Grant No. 50539060)the Innovative Project of Graduate Student in Jiangsu Province (Grant No.2005-60).
文摘Aerator is an important device for release works of hydraulic structures with high-speed flow in order to protect them from cavitation damage. This kind of protecting effect is related closely to cavity length below the aerator, while the cavity length is dominated by the emergence angle over the aerator. Therefore it is crucial to determine this angle accurately. In the present paper the affecting intensities of flow depth and the fluctuating velocity on this angle were analyzed through two introduced parameters. Furthermore, the improved expressions of emergence angle estimation, for both ramp-type and step-type aerators, were presented by means of 68 sets of experimental data from 6 projects based on error theory. The results showed that the present method has higher accuracy than the previously reported methods.
基金This study was supported by 2021 Jiaxing Key Discipline of Medicine(2021-GFXK-01).
文摘The Trendelenburg position and reverse Trendelenburg position are frequently employed during lower abdominal surgery to achieve optimal surgical field visualization and complete exposure of the operative site, particularly under pneumoperitoneum conditions. However, these positions can have significant impacts on the patient’s physiological functions. This article overviews the historical background of Trendelenburg position and reverse Trendelenbury position, their effects on various physiological functions, recent advancements in their clinical applications, and strategies for preventing and managing associated complications.
基金Project Supported by National Natural Science Foundation of China ( Grant No.59671 0 51 ) and by National HighTechnology Resea
文摘Synthetic silicides with good properties were prepared,as Y ions were implanted into silicon using metal vapor vacuum arc (MEVVA) ion implantor and annealed by Rapid Thermal Annealing (RTA).The structure of synthetic silicides has been investigated with the analysis of channeled low angle emergence and TEM.Three layers could be observed in the implanted region as the implanting ion flux is selected as 25μA/cm\+2.The thickness of the silicide layer is about 60—80nm.The defect density N \-d and sheet resistance R \-s decrease with the increase of the ion flux.After RTA annealing of the implanted sample,the N\-d and R\-s decreased obviously.R\-s decreased from 54Ω/□ to 14Ω/□.The minimum of resistivity is 84μΩ·cm.It is evident that electrical properties of the Y silicides can be improved by RTA.The formation of the silicides with YSi and YSi\-2 are confirmed by X\|ray diffraction (XRD) analysis.With the analysis of low angle emergence,important information exposed from the depth profiles of atoms and lattice distortion in an implanted region would be used to study the synthesis of silicides.
