In this paper, hybrid modulation methods suitable for H-bridge MLI are discussed. The results of experimental work using dSPACE system only are presented for three phase five level cascaded type inverter. Different hybrid carrier PWM (Pulse Width Modulation) strategies using sinusoidal reference, third harmonic injection reference, 60 degree reference and stepped wave reference for the chosen i...

This paper introduces the indicators for surge arrester condition assessment based on the leakage current analysis. Maximum amplitude of fundamental harmonic of the resistive leakage current, maximum amplitude of third harmonic of the resistive leakage current and maximum amplitude of fundamental harmonic of the capacitive leakage current were used as indicators for surge arrester condition mon...

As with so many important discoveries in science, the significant improvements in echocardiographic image quality generated by second harmonic imaging were discovered almost by chance. Sound signals, including ultrasound transmitted through tissue, usually contain harmonics. These are additional frequencies, at multiples of the main frequency (called the fundamental). Therefore, second harmonic...

As with so many important discoveries in science, the significant improvements in echocardiographic image quality generated by second harmonic imaging were discovered almost by chance. Sound signals, including ultrasound transmitted through tissue, usually contain harmonics. These are additional frequencies, at multiples of the main frequency (called the fundamental). Therefore, second harmonic...

In this paper a novel method based on evolutionary algorithms is presented to estimate the harmonic components. In general, the optimization of the harmonic estimation process is a multi-component problem, in which evaluation of the phase and harmonic frequency is the nonlinear part of the problem and is solved based on the mathematical and evolutionary methods; while estimation of amplitude of...

We study the rational harmonic mode-locking (RHML) order dependent pulse shortening force and dynamic chirp characteristics of a gain-saturated semiconductor optical amplifier fiber laser (SOAFL) under dark-optical-comb injection, and discuss the competition between mode-locking mechanisms in the SOAFL at high-gain and strong optical injection condition at higher RHML orders. The evolutions of ...

Traveling Wave Tubes (TWTs) are microwave and millimeter wave amplifiers used in radar, satellite communications, and electronic countermeasure applications. On a satellite, the TWT provides the final communications signal boost before transmitting the signal back to earth. In electronic countermeasures, TWTs boost signals that are sent out to deny detection by an enemy radar. The TWT, as with ...

We have demonstrated and characterized the generation of ultra broadband microwave frequency combs with an optical pulse-injected semiconductor laser. Through optical pulse injection, the microwave frequency combs generated in the slave laser (SL) have bandwidths greater than 20 GHz within a +/-5 dB amplitude variation, which is almost 3-fold of the 7 GHz relaxation oscillation frequency of the...

This paper applies the emerging hybrid active third-harmonic current injection converter (H3C) to battery energy storage system (BESS), forming a novel H3C-BESS structure. Compared with commonly used two-stage VSC-BESS, proposed has capability reduce passive components and switching losses. The operation principle of is analyzed mathematical model derived. closed-loop control strategy controlle...

Background: Benign vocal fold lesions (BVFLs) are usually caused by abuse or misuse. Conservative treatment and micro laryngeal surgery (MLS) recommended in the treatment. However, conservative measures difficult to perform some patients contraindicated for general anesthesia.Objective: This study is designed assess practical application, effectiveness, side effects of office-based steriod inje...