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Full-Text Articles in Engineering
Numerical Solutions Of Continuous Wave Beam In Nonlinear Media, Jeffrey Huang
Numerical Solutions Of Continuous Wave Beam In Nonlinear Media, Jeffrey Huang
Dissertations and Theses
Deformation of a Gaussian beam is observed when it propagates through a plasma. Self-focusing of the beam may be observed when the intensity of the laser increases the index of refraction of plasma gas.
Due to the difficulties in solving the nonlinear partial differential equation in Maxwell's wave equation, a numerical technique has been developed in favor of the traditional analytical method. Result of numerical solution shows consistency with the analytical method. This further suggests the validity of the numerical technique employed.
A three dimensional graphics package was used to depict the numerical data obtained from the calculation. Plots from …
Parallel Approximate String Matching Applied To Occluded Object Recognition, David Smith
Parallel Approximate String Matching Applied To Occluded Object Recognition, David Smith
Dissertations and Theses
This thesis develops an algorithm for approximate string matching and applies it to the problem of partially occluded object recognition. The algorithm measures the similarity of differing strings by scanning for matching substrings between strings. The length and number of matching substrings determines the amount of similarity. A classification algorithm is developed using the approximate string matching algorithm for the identification and classification of objects. A previously developed method of shape description is used for object representation.
Threshold Characteristics Of Multimode Laser Oscillators, Mehdi Khoshnevissan
Threshold Characteristics Of Multimode Laser Oscillators, Mehdi Khoshnevissan
Dissertations and Theses
The threshold characteristics of multimode laser oscillators are considered in detail, and a new model is given for semiconductor diode lasers. Analytical expressions and numerical solutions are obtained for mode amplitudes, and over-all spectral characteristics of lasers operating above and below threshold. The theoretical results are i n agreement with experimental data. The band-ta-band absorption is included in the model and i t ' s effect is studied on the mixed broadening.