1.关于“相频特性”对于有阻尼单自由度系统,在简谐激振力Q sin p_t作用下,其稳态响应相位角为ψ=tg^(-1)(2ζλ)/(1-λ~2) (1.1)其中λ=P/ω.,ζ=c/2mω..ω.为相应无阻尼系统的固有频率.由式(1.1)得到(?)与λ的关系,即所谓“相频特性...1.关于“相频特性”对于有阻尼单自由度系统,在简谐激振力Q sin p_t作用下,其稳态响应相位角为ψ=tg^(-1)(2ζλ)/(1-λ~2) (1.1)其中λ=P/ω.,ζ=c/2mω..ω.为相应无阻尼系统的固有频率.由式(1.1)得到(?)与λ的关系,即所谓“相频特性”(图1).在一些教科书[1][2]等中。展开更多
HUC(H-pile and U-pile Connected)组合钢板桩是紧随常规钢板桩之后产生的又一项新的应用技术,它不仅仅继承了钢板桩的优点,还借用工字钢的刚度大的特点,解决了常规钢板桩所存在的刚度不足、基坑变形量大、桩垂直度低、止水效果差等问题...HUC(H-pile and U-pile Connected)组合钢板桩是紧随常规钢板桩之后产生的又一项新的应用技术,它不仅仅继承了钢板桩的优点,还借用工字钢的刚度大的特点,解决了常规钢板桩所存在的刚度不足、基坑变形量大、桩垂直度低、止水效果差等问题,在满足深基坑支护工程的结构功能、安全性和环境保护等方面具有强大的优势。论文以有限元软件为依托,对HUC组合钢板桩的受力性能进行分析,为现实施工提供一个技术参考。展开更多
In HFCVD system the substrate temperature is a key factor which deeply affects the quality of diamond films. Th e magnitude and the variation of the substrate temperature must be limited in a suitable range to depo...In HFCVD system the substrate temperature is a key factor which deeply affects the quality of diamond films. Th e magnitude and the variation of the substrate temperature must be limited in a suitable range to deposit diamond films of uniform thickness over large areas. In this paper, the hot filament parameters are investigated on the basi s of GAs to realize a good substrate temperature profile. Computer simulations d emonstrate that on parameters optimized by GAs a uniform substrate temperatur e field can be formed over a relatively large circle area with R s=10 cm.展开更多
文摘1.关于“相频特性”对于有阻尼单自由度系统,在简谐激振力Q sin p_t作用下,其稳态响应相位角为ψ=tg^(-1)(2ζλ)/(1-λ~2) (1.1)其中λ=P/ω.,ζ=c/2mω..ω.为相应无阻尼系统的固有频率.由式(1.1)得到(?)与λ的关系,即所谓“相频特性”(图1).在一些教科书[1][2]等中。
文摘HUC(H-pile and U-pile Connected)组合钢板桩是紧随常规钢板桩之后产生的又一项新的应用技术,它不仅仅继承了钢板桩的优点,还借用工字钢的刚度大的特点,解决了常规钢板桩所存在的刚度不足、基坑变形量大、桩垂直度低、止水效果差等问题,在满足深基坑支护工程的结构功能、安全性和环境保护等方面具有强大的优势。论文以有限元软件为依托,对HUC组合钢板桩的受力性能进行分析,为现实施工提供一个技术参考。
文摘In HFCVD system the substrate temperature is a key factor which deeply affects the quality of diamond films. Th e magnitude and the variation of the substrate temperature must be limited in a suitable range to deposit diamond films of uniform thickness over large areas. In this paper, the hot filament parameters are investigated on the basi s of GAs to realize a good substrate temperature profile. Computer simulations d emonstrate that on parameters optimized by GAs a uniform substrate temperatur e field can be formed over a relatively large circle area with R s=10 cm.