We have developed a near-field microwave microscope to locally excite a superconducting film and measure secondand third-order harmonic responses at microwave frequencies. We study the local nonlinear response of a YBa2Cu3O72d thin film grown on a bicrystal SrTiO3 substrate. The location of the bicrystal grain boundary is clearly identified by the microscope through higher harmonic response, an...

Algorithms for ground vehicle classification using acoustic measurements often use features based on the relative amplitudes of harmonic components. The average power measured at each harmonic frequency fluctuates due to scattering of the acoustic waves during propagation and additive noise at the sensor. In this paper, we use propagation models for frequencydependent scattering of acoustic sig...

High-harmonic generation in condensed-matter systems is both a source of fundamental insight into quantum electron motion and a promising candidate to realize compact ultraviolet and ultrafast light sources. While graphene is anticipated to efficiently generate high-order harmonics due to its anharmonic charge-carrier dispersion, experiments performed on extended samples using THz illumination ...

Abetmct A concept of optimal surplus harmonies distribution in selective harmonic elimination PWM teehnique for multilevel inverters is introduced in this paper. There m e several performance indexes that fan he optimized in PWM inverters, e.g., distortion factor, current or voltage total harmonic distortion, or efficiency. Minimisation of magnetic noise is selected as an example here. Several ...

We prove existence results for Dirac-harmonic maps using index theoretical tools. They are mainly interesting if the source manifold has dimension 1 or 2 modulo 8. Our solutions are uncoupled in the sense that the underlying map between the source and target manifolds

1 PG Student, Dept of EE, Mata Raj Kaur Institute of Engineering & Technology, Saharanwas, Rewari, India 2 Associate Professor & HOD, Dept of EE, Mata Raj Kaur Institute of Engineering & Technology, Saharanwas, Rewari, India ---------------------------------------------------------------------***--------------------------------------------------------------------ABSTRACT: This paper presents a ...

This paper proposes a novel weighting algorithm for Cross-power Spectrum Phase (CSP) analysis to improve the accuracy of direction of arrival (DOA) estimation for beamforming in a noisy environment. Our sound source is a human speaker and the noise is broadband noise in an automobile. The harmonic structures in the human speech spectrum can be used for weighting the CSP analysis, because harmon...

 In this paper an analysis of conducted harmonic emissions of different types of lamps is presented. The growing use of non-linear loads (pc, printers, electronic devices, etc.) connected to power supply systems and their variability with time, are responsible of a continuously changing harmonic content in the distribution system. Therefore, to analyze their real behaviour, the lamps were test...

Frequency stabilization of a THz quantum cascade laser (QCL) to the harmonic of a microwave source has been accomplished using a Schottky diode waveguide mixer designed for harmonic mixing. The 2.32 THz, 1.0 milliwatt CW QCL is coupled into the signal port of the mixer and a 110 GHz signal, derived from a harmonic of a microwave synthesizer, is coupled into the IF port. The difference frequency...

We address the inverse source problem of finding the time-harmonic current distribution (source) with minimum L2 norm (minimum energy) that generates a prescribed electromagnetic field outside the source’s region of support. Using the well-known multipole expansion of the electromagnetic field we compute (via a linear operator formalism) the sought-after minimum L2 norm-current distribution con...