全文文献 工具书 数字 学术定义 翻译助手 学术趋势 更多

 共[7594]条 当前为第1条到20条[由于搜索限制，当前仅支持显示前5页数据]

 sheet Let BH = {BH(t ), t ∈ ?N} be an (N, d)-fractional Brownian sheet with index H = (H1, . Let $B^H=\{B^H(t), t\in {\Bbb R}_+^N\}$ be an (N, d)-fractional Brownian sheet with Hurst index H = (H1,...,HN) ∈ (0, 1)N. In particular, we show that offsets to ellipses and hyperbolas are ofnonzero genus except for the circles, and somewhat surprisingly, that offsets to paraboloids and hyperboloids with one sheet can all be rationally parametrized. From the FTIR spectra, it was found that during the transition process of polyamide 618, the intensity of the intra-sheet hydrogen bonds becomes weak. This approach is different from the method of equivalent distributed current sheet and more suitable for electric machines, which have concentrated coils and deeper slots. Analysis and experiment on deformation of sheet metal by laser shock wave An evaluation formula of the detonation wave pressure in the system of laser, energy transferring-medium and sheet metal is built according to the theory of detonation wave and blasting gas-dynamics. The result shows that the quantity of sheet metal deforming is nonlinearly increased with laser energy, i.e., pressure of the laser shock wave. Finite element simulations of sheet metal forming under complex strain paths Fracture is a common defect in sheet metal forming and it is essentially caused by tensile instability. This paper analyzes some experiments and theories for building forming limit diagrams of sheet metal and points out the advantages and disadvantages of current experiments and theories. According to this, a method that integrates the finite element simulation and experiment was used to research the forming limit diagrams of the sheet metal under complex strain paths. Results indicate that finite element method (FEM) can achieve the complex strain paths and different strain paths will have great impacts on the result of the sheet metal forming. A commercial PTA production flow sheet includes a number of unit operations, which construct a complex process system. On-line r value determination of deep drawing steel sheet The rapid and accurate determination technology overcomes the shortages of current technologies which emphasize either more on velocity or more on accuracy, and can be applied to the on-line r value determination of deep drawing steel sheet. XRD analyses indicate that the kaolinite sheet-like structure was disordered after microwave irradiation. The urea decomposition process and explosion effect between the sheet-like structures of kaolinite under microwave irradiation were discussed. SAR interferometry was applied to build the DEM of ice sheet and monitor ice flow in the polar region. The improved KIVA-3V code is incorporated with an impingement model, a heat transfer model and a linearized instability sheet atomization (LISA) model to model the hollow cone spray.

 CNKI主页 |  设CNKI翻译助手为主页 | 收藏CNKI翻译助手 | 广告服务 | 英文学术搜索
2008 CNKI－中国知网

2008中国知网(cnki) 中国学术期刊(光盘版)电子杂志社