应用新鲜成人尸体小腿10侧,用 X 线血管造影的方法,对小腿深筋膜以浅的小动脉血管的密度、方向和吻合进行了研究。发现皮肤和浅筋膜层中纵行血管密度明显高于横行者。纵行血管密度以浅筋膜层为高,横行血管密度两层比较差别不明显。各层...应用新鲜成人尸体小腿10侧,用 X 线血管造影的方法,对小腿深筋膜以浅的小动脉血管的密度、方向和吻合进行了研究。发现皮肤和浅筋膜层中纵行血管密度明显高于横行者。纵行血管密度以浅筋膜层为高,横行血管密度两层比较差别不明显。各层中分区血管密度的比较说明,不论何种走向的血管,其密度可因部位而异。不同层次、不同部位、不同方向的血管吻合率比较均无显著差别。血管密度高的部位血管吻合也相应丰富。为小腿轴型皮瓣设计提供了参考。展开更多
Vacuum vessel of the HT-7U is a fully welded toroidal structure with a noncircular cross-section nested in the bore of the TF coils. According to the requirement of the physics design, sixteen horizontal ports on outb...Vacuum vessel of the HT-7U is a fully welded toroidal structure with a noncircular cross-section nested in the bore of the TF coils. According to the requirement of the physics design, sixteen horizontal ports on outboard mid-plane and thirty-two vertical ports on the top and bottom are designed for diagnostics, plasma heating, current driving, vacuum pumping and gas puffing. Bellows on these port necks are used for flexible components to absorb the relative displacement in radial and vertical directions due to external load, thermal expansion or contrac-tion and assembly tolerance, and also used for isolation of mechanical vibration. For the support system of vacuum vessel it should be not only strong enough to withstand forces acting on the vessel interior components and the vessel itself due to the dead weight and electromagnetic inter-actions during plasma disruption, but also sufficiently flexible to be suited to thermal expansion during baking. In order to solve this contradiction a new kind of low rigid support has been designed, which has a perfectly rigid in vertical direction and perfectly soft in radial direction. Some three-dimension finite element COSMOS models were performed to analyze their structural strength, stiffness and fatigue life, with an emphasis on the static stress analysis. The load spectra during vacuum vessel operation were also simulated on these models in the view of fatigue design. It was confirmed that the bellows and support had sufficient strength in the designed range of the load conditions. The results showed that the peak stress on bellows was 87 MPa and on the support system was 97 MPa. Now all kinds of bellows and support system have been designed. In order to accumulate some engineering experiences and probe into some molding die and welding technologies, prototypical bellows and support system have been fabricated. At the same time a mechanical testing apparatus was designed for proof tests on the prototypical bellows and support to verify their functional and structure c展开更多
文摘应用新鲜成人尸体小腿10侧,用 X 线血管造影的方法,对小腿深筋膜以浅的小动脉血管的密度、方向和吻合进行了研究。发现皮肤和浅筋膜层中纵行血管密度明显高于横行者。纵行血管密度以浅筋膜层为高,横行血管密度两层比较差别不明显。各层中分区血管密度的比较说明,不论何种走向的血管,其密度可因部位而异。不同层次、不同部位、不同方向的血管吻合率比较均无显著差别。血管密度高的部位血管吻合也相应丰富。为小腿轴型皮瓣设计提供了参考。
基金This work was supported by the National Meg-Science Engineering Project of the Chinese Gorernment
文摘Vacuum vessel of the HT-7U is a fully welded toroidal structure with a noncircular cross-section nested in the bore of the TF coils. According to the requirement of the physics design, sixteen horizontal ports on outboard mid-plane and thirty-two vertical ports on the top and bottom are designed for diagnostics, plasma heating, current driving, vacuum pumping and gas puffing. Bellows on these port necks are used for flexible components to absorb the relative displacement in radial and vertical directions due to external load, thermal expansion or contrac-tion and assembly tolerance, and also used for isolation of mechanical vibration. For the support system of vacuum vessel it should be not only strong enough to withstand forces acting on the vessel interior components and the vessel itself due to the dead weight and electromagnetic inter-actions during plasma disruption, but also sufficiently flexible to be suited to thermal expansion during baking. In order to solve this contradiction a new kind of low rigid support has been designed, which has a perfectly rigid in vertical direction and perfectly soft in radial direction. Some three-dimension finite element COSMOS models were performed to analyze their structural strength, stiffness and fatigue life, with an emphasis on the static stress analysis. The load spectra during vacuum vessel operation were also simulated on these models in the view of fatigue design. It was confirmed that the bellows and support had sufficient strength in the designed range of the load conditions. The results showed that the peak stress on bellows was 87 MPa and on the support system was 97 MPa. Now all kinds of bellows and support system have been designed. In order to accumulate some engineering experiences and probe into some molding die and welding technologies, prototypical bellows and support system have been fabricated. At the same time a mechanical testing apparatus was designed for proof tests on the prototypical bellows and support to verify their functional and structure c
