涡旋流体机械转子、定子几何设计与制图方法

简述了涡旋式压缩机涡旋转子、定子几何尺寸设计方法，推导了计算公式，还介绍了用基方渐开线替代基圆渐开线在涡旋流体机械设计中的绘图方法，确立了替代原则和计算公式，并举例说明。该绘图方法原理简单易懂准确实用。

涡旋真空泵——一种具有发展潜力的无油泵

涡旋真空泵是一种新型的无油直排大气机械泵,它具有动力传递简单、气体流动损失小、运行平稳、结构简单紧凑、密封性能好、消耗功率小、振动噪声低、可靠性高等优点。本文简要介绍了涡旋泵的发展过程、工作原理、结构特点、设计和工艺技术问题以及目前的生产厂家、产品和市场应用前景。

Vortex and Gaussian Solitons of (3+1)-Dimensional Spatially Modulated Cubic-Quintic-Septimal Nonlinear Schrdinger Equation with External Potential

Based on the variable separation principle and the similarity transformation, vortex soliton solution of a （3＋1）-dimensional cubie-quintic-septimal nonlinear Schrodinger equation with spatially modulated nonlinearity under the external potential are obtained in the spatially modulated cubic-quintic-septimal nonlinear media. If the topological charge m = 0 and m ≠0, Gaussian solitons and vortex solitons can be constructed respectively. The shapes of vortex soliton possess similar structures when the value of l - m is same. Moreover, all phases of vortex solitons exist m-jump with the change of every jump as 2π/m-jumps, and thus totally realize the azimuthal change of 21r around their cores.