Flow Physics Generating Highly Nonlinear Lateral Stability Characteristics of 65-Degree Delta-Wing-Body

2001 ◽  
Vol 38 (5) ◽  
pp. 932-934 ◽  
Author(s):  
Lars E. Ericsson
Keyword(s):  
Delta Wing ◽  
Lateral Stability ◽  
Flow Physics ◽  
Highly Nonlinear

DDES study of the aerodynamic forces and flow physics of a delta wing in static ground effect

2015 ◽  
Vol 43 ◽  
pp. 423-436 ◽  
Author(s):  
Yunpeng Qin ◽  
Qiulin Qu ◽  
Peiqing Liu ◽  
Yun Tian ◽  
Zhe Lu
Keyword(s):  
Delta Wing ◽  
Ground Effect ◽  
Aerodynamic Forces ◽  
Flow Physics

Laser Oscillation in Aggregates of Ultrasmall Si Nanoparticles

2002 ◽  
Vol 728 ◽  
Author(s):  
Munir H. Nayfeh
Keyword(s):  
Stimulated Emission ◽  
Gaussian Beams ◽  
Single Particles ◽  
Nonlinear Characteristics ◽  
Femtosecond Radiation ◽  
Highly Nonlinear ◽  
Line Narrowing ◽  
Si Nanoparticles ◽  
Speckle Patterns ◽  
Spectral Line Narrowing

AbstractWe dispersed electrochemically etched Si into ultrabright ultrasmall nanoparticles, with brightness higher than fluorescein or rhodamine. The emission from single particles is readily detectable. Aggregates or films of the particles exhibit emission with highly nonlinear characteristics. We observe directed blue beams at ∼ 410 nm between faces of aggregates excited by femtosecond radiation at 780 nm; and at ∼ 610 nm from aggregates of red luminescent Si nanoparticles excited by radiation at 550-570 nm from a mercury lamp. Intense directed Gaussian beams, a pumping threshold, spectral line narrowing, and speckle patterns manifest the emission. The results are analyzed in terms of population inversion and stimulated emission in quantum confinement-induced Si-Si dimer phase, found only on ultrasmall Si nanoparticles. This microlasing constitutes an important step towards the realization of a laser on a chip.

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