当代城市产业呈现小型化、集群化发展的趋势,它们与城市其他功能协同发展,在空间上则趋向于相互混合。在一些城市出现了“创新街区”(Innovation District)现象,成为城市更新的重要类型之一。在2021年同济大学本科毕业设计中1,我们选择...当代城市产业呈现小型化、集群化发展的趋势,它们与城市其他功能协同发展,在空间上则趋向于相互混合。在一些城市出现了“创新街区”(Innovation District)现象,成为城市更新的重要类型之一。在2021年同济大学本科毕业设计中1,我们选择上海杨浦滨江创新街区设计作为主题,以城市形态类型学为主要的分析研究和设计工具,课题在总体空间布局(宏观)、典型街廓(中观)和城市建筑(微观)3个层面展开研究和设计,得出3个主要结论:(1)低(多)层高密是创新街区的基本空间特征,是形成高密度、小尺度公共空间网的必要条件;(2)为了实现小尺度企业共建的聚集,作为“城市细胞”的街廓应提供多产权共存的用地模式(land use segmentation),联立式和独立式是两种典型;(3)小尺度城市建筑设计必须兼顾“共性”(外部空间塑造)于“个性”(内部空间塑造),同时实现多功能在建筑内部的混合。展开更多
Carbon-carbon composite （C/C） materials are prone to severe oxidation and volatilization problems. To address these issues, mullite （3Al2O3.2SiO2）/silicon carbide （SIC） coatings were deposited on C/C composite s...Carbon-carbon composite （C/C） materials are prone to severe oxidation and volatilization problems. To address these issues, mullite （3Al2O3.2SiO2）/silicon carbide （SIC） coatings were deposited on C/C composite substrates characterized into high and low densities. The coatings were applied by a two-step approach： pack cementation and silica sol based slurry coating processes. The relationship between the microstructure of 3Al2O3·2SiO2/SiC coatings and C/C substrates during isothermal oxidation cycle at 1 500 ℃ was investigated using X-ray diffractometer （XRD） and scanning electron microscope （SEM） mounted with energy dispersive spectrometer （EDS）. The results indicate that the density of the substrates has a marked effect on the coatings. Dense, thick and well-bonded coatings are obtained in the high density substrate. After 106 h of isothermal oxidation, the high density substrate with 3Al2O3-2SiO2/SiC coating offers effective protection as compared to low density substrate suffering recession.展开更多
文摘当代城市产业呈现小型化、集群化发展的趋势,它们与城市其他功能协同发展,在空间上则趋向于相互混合。在一些城市出现了“创新街区”(Innovation District)现象,成为城市更新的重要类型之一。在2021年同济大学本科毕业设计中1,我们选择上海杨浦滨江创新街区设计作为主题,以城市形态类型学为主要的分析研究和设计工具,课题在总体空间布局(宏观)、典型街廓(中观)和城市建筑(微观)3个层面展开研究和设计,得出3个主要结论:(1)低(多)层高密是创新街区的基本空间特征,是形成高密度、小尺度公共空间网的必要条件;(2)为了实现小尺度企业共建的聚集,作为“城市细胞”的街廓应提供多产权共存的用地模式(land use segmentation),联立式和独立式是两种典型;(3)小尺度城市建筑设计必须兼顾“共性”(外部空间塑造)于“个性”(内部空间塑造),同时实现多功能在建筑内部的混合。
基金Project(2011CB605805) supported by the National Basic Research Program of ChinaProject(51021063) supported by the Creative Research Group of National Natural Science Foundation of China
文摘Carbon-carbon composite （C/C） materials are prone to severe oxidation and volatilization problems. To address these issues, mullite （3Al2O3.2SiO2）/silicon carbide （SIC） coatings were deposited on C/C composite substrates characterized into high and low densities. The coatings were applied by a two-step approach： pack cementation and silica sol based slurry coating processes. The relationship between the microstructure of 3Al2O3·2SiO2/SiC coatings and C/C substrates during isothermal oxidation cycle at 1 500 ℃ was investigated using X-ray diffractometer （XRD） and scanning electron microscope （SEM） mounted with energy dispersive spectrometer （EDS）. The results indicate that the density of the substrates has a marked effect on the coatings. Dense, thick and well-bonded coatings are obtained in the high density substrate. After 106 h of isothermal oxidation, the high density substrate with 3Al2O3-2SiO2/SiC coating offers effective protection as compared to low density substrate suffering recession.
