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The following sections are included:

• Laser Fundamentals
• General Construction of a Laser
• Constructing Ultrafast Pulsed Laser
• Chirped Pulse Amplification (CPA)
• Amplifier
• Reference
• Further Reading

An aerodynamic optimization design study of a transonic compressor blade is carried out based on the three-dimensional parametric approach of local shape function. To avoid too many design variables and repeated mesh generation of optimized blade compare to the traditional approach in blade optimization. Mesh deformation technique of the reduced control points based on radial basis functions (RBF) is proposed, which combined with gradient based optimization algorithm, to solve the blade optimized problem. Analysis showed that: RBF mesh deformation technology could largely shorten the time of mesh generation without reducing the quality of meshes; the computational time was reduced greatly due to the gradient based optimization algorithm; the optimized blade increases the total pressure ratio by 0.86%, the adiabatic efficiency by 1.79% and the mass flow by 0.6% under the condition of consistent certain pressure outlet. The improvement of blade performance mainly is owing to the decrease of passage shock intensity.

In this paper, according to the application practice of scroll compressor for refrigeration and air-conditioning, various factors affecting the whole refrigeration effect of the compressor are studied, the influence of scroll wrap's different forms on compressor exhaust angle and the compression ratio is stated, and it establishes the working principle simulation of the compressor's main parts, and further corrects the form of vortex lines according to simulation results.