. Tl:is paper des?ribes a scat tering method for meas uring microwave diff ractio n fi elds uSlllg light modulatIO n. A small photoelectric cell is suspended in t he fi eld as a scatterer upon whi ch light p ulses shine at an audi o rate. Only t he siO"nal scattered back by t he scat~ terer is modulated. A co herent detecto r is used which has ban outp ut voltage proportional to t he square of ...

We discuss two fast algorithms to localize multiple sources in near field. The symmetry-based method proposed by Zhi and Chia (2007) is first improved by implementing a search-free procedure for the reduction of computation cost. We present then a focusing-based method which does not require symmetric array configuration. By using focusing technique, the near-field signal model is transformed i...

This paper focus on the advancement of SVPWM (space vector pulse width modulation) inverter fed permanent magnet synchronous motor (PMSM).The paper deals with a space vector pulse width modulation (SVPWM) algorithm applied to electrical drives. Anextensive and detailed study of the space vector pulse width modulation design process hasbeen done, that indicate some practical sign for implementat...

Image processing techniques are used to extract meaningful information from medical images. A major concern in denoising low-field MR brain images is the poor quality images secondary to a worsening signal-to-noise ratio (SNR) compared with the high-field MRI scanners. Low-field Magnetic Resonance Imaging (MRI) is vital in sensitive surgeries to allow real-time imaging in the operation theatre....

Probe-corrected spherical near-field antenna measurements with an arbitrary probe set certain requirements on an applicable scanning technique. The computational complexity of the general high-order probe correction technique for an arbitrary probe, that is based on the scanning, is , where is proportional to the radius of the antenna under test (AUT) minimum sphere in wavelengths. With the pre...

The purpose of this work is to show that there exists an additional invariance of the βfunction equations of string theory on d + 1-dimensional targets with d toroidal isometries. It corresponds to a shift of the dilaton field and a scaling of the lapse function, and is reminiscent of string field redefinitions. While it preserves the form of the β-function equations, it changes the effective a...

We present a novel technique for particle sizing based on recent studies about the statistical information contained within the light intensity distribution close to a disordered sample. We show that it is much simpler and more robust than the traditional light scattering methods and any imaging technique. Applications to optical diagnostics, process monitoring and pollution monitoring are expe...

This paper reviews applications of acoustic emission sensing techniques in machining. Originally applied to non-destructive testing of structures but now Acoustic Emission Signals are proving to be an effective tool for monitoring of the machining process due to its sensitivity to process parameters. The source of AE is attributed to the release of stored elastic energy that manifests itself in...

the lateral field. The basal layer, averaging 0.5 /~m in thickness, has vertical striations with a periodicity of approx. 0.025 /~m. At the edges of the lateral field this layer becomes forked and is replaced, under the field, by two obliquely oriented fiber layers (Fig. 3), each of which appears to be composed of many fibrils. A thin, often discontinous electron-transparent zone separates the ...