In this paper we discuss the bandwidth enhancement that can be achieved in multi-Joule optical parametric chirped pulse amplification (OPCPA) systems exploiting the tunability of parametric amplification. In particular, we consider a pair of single pass amplifiers based on potassium dideuterium phosphate (DKDP), pumped by the second harmonic of Nd:glass and tuned to amplify adjacent regions of ...

Due to the advantages of low harmonic, pollution power grid, and easy filtering, multilevel inverters have attracted more attention in recent years. In this paper, a five-level inverter based on differential structure is proposed. It doesn’t need an additional bridge arm change polarity output voltage, but synthesize generating multiple voltages changing voltage. addition, special symmetrical s...

Cascaded H-bridge multilevel inverters have been developed for applications including user interface of renewable energy, voltage regulation, VAR compensation, and harmonic filtering in power systems. A modified cascaded inverter (MLI) is implemented solar applications. Multilevel based on topology will help the reduction number switches. This concept helps to reduce complexity switching compar...

speech emotion recognition (ser) is a new and challenging research area with a wide range of applications in man-machine interactions. the aim of a ser system is to recognize human emotion by analyzing the acoustics of speech sound. in this study, we propose spectral pattern features (sps) and harmonic energy features (hes) for emotion recognition. these features extracted from the spectrogram ...

Considering the advantage of Empirical Mode Decomposition (EMD) for extracting geophysical signals and filtering out noise, this paper will first apply EMD approach to post-process Gravity Recovery Climate Experiment (GRACE) monthly gravity field models. A 14-year time-series Release 06 (RL06) models from Center Space Research (CSR) truncated degree order 60 period April 2002 August 2016 are an...

Our study was concerned with the disparity detectors underlying the initial disparity vergence responses (DVRs) that are elicited at ultrashort latencies by binocular disparities applied to large images. DVRs were elicited in humans by applying horizontal disparity to vertical square-wave gratings lacking the fundamental (termed here, the "missing fundamental"). In the frequency domain, a pure ...