目的:比较一站式复合再血管化技术与非体外循环下冠状动脉旁路移植术(OPCABG)治疗冠状动脉多支病变的术后30天预后结果,探讨一站式复合再血管化技术临床应用安全性及有效性。方法:2009-01至2017-01,在阜外医院接受一站式复合再血管化治...目的:比较一站式复合再血管化技术与非体外循环下冠状动脉旁路移植术(OPCABG)治疗冠状动脉多支病变的术后30天预后结果,探讨一站式复合再血管化技术临床应用安全性及有效性。方法:2009-01至2017-01,在阜外医院接受一站式复合再血管化治疗的冠状动脉多支病变患者共533例(一站式复合技术组)。应用倾向性评分法,筛选同期533例OPCABG患者(OPCABG组)与一站式复合技术组患者进行1:1配对。主要终点事件为术后30天主要不良心脑血管事件(MACCE);次要终点为术后住院结果,包括术后胸管总引流量,血制品使用率,术后呼吸机使用时间、重症监护室(ICU)停留时间等。结果:与OPCABG组相比,一站式复合技术组术后胸管总引流量[714(523,971)ml vs 965(716,1 220)ml,P<0.001]显著减少,降低了血制品使用率(19.7%vs 34.0%,P=0.024),缩短了呼吸机使用时间[12.6(9.3,15.7)h vs16.0(12.8,18.7)h,P<0.001]和ICU停留时间[21.7(19.8,42.4)h vs 41.6(23.6,70.0)h,P<0.001];术后30天全因死亡率、心肌梗死、脑血管事件、再血管化事件及总体MACCE发生率差异均无统计学意义。结论:对于冠状动脉多支病变患者,一站式复合再血管化技术提供了另一种安全、有效的治疗选择;与OPCABG相比,创伤减少,早期治疗效果相似。展开更多
Bulk anisotropic Nd-Fe-B magnets were prepared from hydrogen-disproportionation-desorption-recombination（HDDR） powders via spark plasma sintering（SPS） and subsequent hot deformation. The influence of sintering tem...Bulk anisotropic Nd-Fe-B magnets were prepared from hydrogen-disproportionation-desorption-recombination（HDDR） powders via spark plasma sintering（SPS） and subsequent hot deformation. The influence of sintering temperature on the structure and magnetic properties of the spark plasma sintered Nd-Fe-B magnets were studied. The remanence Br, intrinsic coercivity Hcj, and the maximum energy product（BH）max, of sintered Nd-Fe-B magnets first increase and then decrease with the increase of sintering temperature, TSPS, from 650 °C to 900 °C. The optimal magnetic properties can be obtained when TSPS is 800 °C. The Nd-Fe-B magnet sinter treated at 800 °C was subjected to further hot deformation. Compared with the starting HDDR powders or the SPS treated magnets, the hot-deformed magnets present more obvious anisotropy and possess much better magnetic properties due to the good c-axis texture formed in the deformation process. The anisotropic magnet deformed at 800 °C with 50% compression ratio has a microstructure consisting of well aligned and platelet-shaped Nd2Fe14 B grains without abnormal grain growth and exhibits excellent magnetic properties parallel to the pressing axis.展开更多
The recrystallization nucleation processes of two cold-rolled Al-Mg-Si/SiCpcomposites with different contents of Mg are investigated mainly by dynamic mechanical analyzer （DMA） and electron microscopy including high...The recrystallization nucleation processes of two cold-rolled Al-Mg-Si/SiCpcomposites with different contents of Mg are investigated mainly by dynamic mechanical analyzer （DMA） and electron microscopy including high angle annular dark field scanning transmission electron microscopy （HAADF-STEM） andhigh-resolution transmission electron microscopy （HRTEM）. Internal friction and electron microscopy results show that solute atom clusters are present in association with dislocationsin supersaturated cold-rolled composites. During recrystallization process, the internal friction peak position of Al-Mg-Si/3SiCp/2Mg （volume fraction,%） is higher than that of Al-Mg-Si/3SiCp（volume fraction,%） due to more solute atom clusters formed in association with the dislocations in the cold-rolled composite with a much higher Mg content, indicating a strongerresistance for the recrystallization nucleation.展开更多
Mechanical behavior of nickel？titanium shape memory alloy（NiTi SMA） under hot deformation was investigated according to the true stress—strain curves of NiTi samples under compression at the strain rates of 0.001-...Mechanical behavior of nickel？titanium shape memory alloy（NiTi SMA） under hot deformation was investigated according to the true stress—strain curves of NiTi samples under compression at the strain rates of 0.001-1 s-1 and at the temperatures of 600？1000℃.Dynamic recovery and dynamic recrystallization of NiTi SMA were systematically investigated by microstructural evolution.The influence of the strain rates,the deformation temperatures and the deformation degree on the dynamic recovery and dynamic recrystallization of NiTi SMA was obtained as well.NiTi SMA was characterized by the combination of dynamic recovery and dynamic recrystallization at 600℃ and 700℃,but the complete dynamic recrystallization occurred at other deformation temperatures.Increasing the deformation temperatures or decreasing the stain rates leads to larger equiaxed grains.The deformation degree has an important influence on the dynamic recrystallization of NiTi SMA.There exists the critical deformation degree during the dynamic recrystallization of NiTi SMA,beyond which the larger deformation degree contributes to obtaining the finer equiaxed grains.展开更多
文摘目的:比较一站式复合再血管化技术与非体外循环下冠状动脉旁路移植术(OPCABG)治疗冠状动脉多支病变的术后30天预后结果,探讨一站式复合再血管化技术临床应用安全性及有效性。方法:2009-01至2017-01,在阜外医院接受一站式复合再血管化治疗的冠状动脉多支病变患者共533例(一站式复合技术组)。应用倾向性评分法,筛选同期533例OPCABG患者(OPCABG组)与一站式复合技术组患者进行1:1配对。主要终点事件为术后30天主要不良心脑血管事件(MACCE);次要终点为术后住院结果,包括术后胸管总引流量,血制品使用率,术后呼吸机使用时间、重症监护室(ICU)停留时间等。结果:与OPCABG组相比,一站式复合技术组术后胸管总引流量[714(523,971)ml vs 965(716,1 220)ml,P<0.001]显著减少,降低了血制品使用率(19.7%vs 34.0%,P=0.024),缩短了呼吸机使用时间[12.6(9.3,15.7)h vs16.0(12.8,18.7)h,P<0.001]和ICU停留时间[21.7(19.8,42.4)h vs 41.6(23.6,70.0)h,P<0.001];术后30天全因死亡率、心肌梗死、脑血管事件、再血管化事件及总体MACCE发生率差异均无统计学意义。结论:对于冠状动脉多支病变患者,一站式复合再血管化技术提供了另一种安全、有效的治疗选择;与OPCABG相比,创伤减少,早期治疗效果相似。
基金Project(NCET-10-0364)supported by the Program for New Century Excellent Talents in University,ChinaProject(2012ZG0006)supported by the Fundamental Research Funds for the Central Universities,ChinaProject(51174095)supported the National Natural Science Foundation of China
文摘Bulk anisotropic Nd-Fe-B magnets were prepared from hydrogen-disproportionation-desorption-recombination（HDDR） powders via spark plasma sintering（SPS） and subsequent hot deformation. The influence of sintering temperature on the structure and magnetic properties of the spark plasma sintered Nd-Fe-B magnets were studied. The remanence Br, intrinsic coercivity Hcj, and the maximum energy product（BH）max, of sintered Nd-Fe-B magnets first increase and then decrease with the increase of sintering temperature, TSPS, from 650 °C to 900 °C. The optimal magnetic properties can be obtained when TSPS is 800 °C. The Nd-Fe-B magnet sinter treated at 800 °C was subjected to further hot deformation. Compared with the starting HDDR powders or the SPS treated magnets, the hot-deformed magnets present more obvious anisotropy and possess much better magnetic properties due to the good c-axis texture formed in the deformation process. The anisotropic magnet deformed at 800 °C with 50% compression ratio has a microstructure consisting of well aligned and platelet-shaped Nd2Fe14 B grains without abnormal grain growth and exhibits excellent magnetic properties parallel to the pressing axis.
基金Project(LH201236)supported by the Pre-research Project of Equipment Development Department of China
文摘The recrystallization nucleation processes of two cold-rolled Al-Mg-Si/SiCpcomposites with different contents of Mg are investigated mainly by dynamic mechanical analyzer （DMA） and electron microscopy including high angle annular dark field scanning transmission electron microscopy （HAADF-STEM） andhigh-resolution transmission electron microscopy （HRTEM）. Internal friction and electron microscopy results show that solute atom clusters are present in association with dislocationsin supersaturated cold-rolled composites. During recrystallization process, the internal friction peak position of Al-Mg-Si/3SiCp/2Mg （volume fraction,%） is higher than that of Al-Mg-Si/3SiCp（volume fraction,%） due to more solute atom clusters formed in association with the dislocations in the cold-rolled composite with a much higher Mg content, indicating a strongerresistance for the recrystallization nucleation.
基金Project(51071056) supported by the National Natural Science Foundation of ChinaProjects(HEUCFR1132,HEUCF121712) supported by the Fundamental Research Funds for the Central Universities of China
文摘Mechanical behavior of nickel？titanium shape memory alloy（NiTi SMA） under hot deformation was investigated according to the true stress—strain curves of NiTi samples under compression at the strain rates of 0.001-1 s-1 and at the temperatures of 600？1000℃.Dynamic recovery and dynamic recrystallization of NiTi SMA were systematically investigated by microstructural evolution.The influence of the strain rates,the deformation temperatures and the deformation degree on the dynamic recovery and dynamic recrystallization of NiTi SMA was obtained as well.NiTi SMA was characterized by the combination of dynamic recovery and dynamic recrystallization at 600℃ and 700℃,but the complete dynamic recrystallization occurred at other deformation temperatures.Increasing the deformation temperatures or decreasing the stain rates leads to larger equiaxed grains.The deformation degree has an important influence on the dynamic recrystallization of NiTi SMA.There exists the critical deformation degree during the dynamic recrystallization of NiTi SMA,beyond which the larger deformation degree contributes to obtaining the finer equiaxed grains.
