Truly single-mode amplification of femtosecond pulses from a fiber oscillator to ~100 nJ is demonstrated. Amplitude and phase noise characterization of the source and its robustness demonstrates its potential for many...
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Time-domain pulse propagation on microstrip transmission lines excited by a finite-gap voltage source is investigated with special attention given to the dispersive effects associated with the individual components of...
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Time-domain pulse propagation on microstrip transmission lines excited by a finite-gap voltage source is investigated with special attention given to the dispersive effects associated with the individual components of the transmission-line current. High-frequency effects due to leaky modes are of particular interest. The results show that dispersion can be quite different and more severe than that predicted by the bound mode alone
Raman spectra of carbon nanowalls grown by microwave plasma enhanced chemical vapor deposition were analyzed. A typical Raman spectrum of carbon nanowalls exhibits three main bands, i.e., the G, D and D' bands cen...
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Time-resolved mid-infrared pump-probe measurements in a quantum cascade laser operating above threshold reveal gain recovery dynamics to be two-fold: relaxation within a stage on a sub-picosecond scale and transport b...
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A table-top lambda = 13.2 nm soft X-ray laser operating at 5 Hertz repetition rate with 1 muW average power was demonstrated in Ni-like Cd. Lasing down to 10.9 nm was also obtained in transitions of other Ni-like ions.
ISBN:
(纸本)1557528136
A table-top lambda = 13.2 nm soft X-ray laser operating at 5 Hertz repetition rate with 1 muW average power was demonstrated in Ni-like Cd. Lasing down to 10.9 nm was also obtained in transitions of other Ni-like ions.
Various fitness functions have been evaluated for image reconstruction using binary genetic algorithm (BGA) based parallel ray transmission tomography. The population initialization is carried out using the filtered b...
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Various fitness functions have been evaluated for image reconstruction using binary genetic algorithm (BGA) based parallel ray transmission tomography. The population initialization is carried out using the filtered backprojection (FBP) technique. Various fitness functions used for image reconstruction include: root mean squared error (RMSE), mean squared error (MSE), mean absolute error (MAE), relative squared error (RSE), root relative squared error (RRSE) and relative absolute error (RAE). RMSE and MAE outperformed for small as well as large size images with different shape complexities. Mixed selection scheme with two variations of crossover operators, namely image-row and block crossover operators have been used for crossover. Binary mutation operator has been used for creating diversity in local search scope. For 64 times 64 head and lung phantoms, BGA has resulted in PSNR values with RMSE 19.26 and 16.49 respectively and 27.20 and 29.65 dB with MAE
We consider a partially feedback linearizable system with stable zero dynamics. The system is uncertain and only the output is measured. Consequently, exact feedback linearization is not applicable. We propose to desi...
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ISBN:
(纸本)1424401704
We consider a partially feedback linearizable system with stable zero dynamics. The system is uncertain and only the output is measured. Consequently, exact feedback linearization is not applicable. We propose to design an extended high-gain observer to recover unmeasured derivatives of the output and an extra one, which contains information about the uncertainty. The observer can be stabilized via feedback linearization followed by a linear control design, such as pole placement or LQR. After a short peaking period, a partial state vector, which includes the output and its derivatives, will be in a small neighborhood of the state of the observer; therefore, the performance achievable under exact feedback linearization will be recovered
The electroluminescence, photoluminescence and cathodoluminescence of GalnN/GaN multiple quantum well light emitting diode dies are analyzed at variable low temperature. Three dies of nominally identical structure but...
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