We present an experiment where Ramsey-type spectroscopy is applied to autoionizing states of krypton by using the ninth harmonic (88 nm) of a femtosecond Ti:sapphire laser. The ionization process, detected by an electron-energy spectrometer, shows the characteristic quantum interference pattern. The behavior of the fringe contrast compares favorably with a simple essential-state model, whose pa...

This guide applies to all types of static power converters used in industrial and commercial power systems. The problems involved in the harmonic control and reactive compensation of such converters are addressed, and an application guide is provided. Limits of disturbances to the ac power distribution system that affect other equipment and communications are recommended. This guide is not inte...

We illustrate how the sub-10fs lasers and attosecond XUV pulses can be used to probe the structure of molecules. Experimental results of the alignment dependence of the ionization rates and the high-order harmonic generation yields are shown to reflect the structure of the highest occupied molecular orbital. We also show that the vibrational wave packet of simple molecules can be mapped accurat...

Chiroptical spectroscopies provide structural analyses of molecules and nanoparticles but they require sample volumes that are incompatible with generating large chemical libraries. New optical tools needed to characterize chirality for the ultrasmall (<1 µl) required in high-throughput synthetic analytical stations chiral compounds. Here we show experimentally a novel photonic effect enables s...

The traditional sensorless control system of permanent magnet synchronous motor (PMSM) has the problems low estimation accuracy and poor anti-interference ability. Moreover, position performance is subjected to harmonic ripples caused by inverter nonlinearities flux spatial harmonics. To optimize dynamic PMSM system, this paper proposes a scheme that combines integral backstepping with enhanced...

In this study, we propose a frequency domain F0 estimation approach based on long term Harmonic Feature Analysis combined with artificial neural network (ANN) classification. Long term spectrum analysis is proposed to gain better harmonic resolution, which reduces the spectrum interference between speech and noise. Next pitch candidates are extracted for each frame from the long term spectrum. ...