Abstract The paper presents a hydrocarbon field exploration technique based on the ratio coefficient measurement of two-frequency amplitudes. study establishes electronic plasma resonance frequencies. anomalous values show large range when receiving reflected signal at station line points. test proved an increase in accuracy boundaries by 20-30 %. findings can be implemented prospecting geophys...

An improved theoretical approach is proposed to predict the dynamic behavior of long, slender and flexible microcantilevers affected by squeeze-film damping at low ambient pressures. Our approach extends recent continuum gas damping models (Veijola 2004 J. Micromech. Microeng. 14 1109–18, Gallis and Torczynski 2004 J. Microelectromech. Syst. 13 653–9), which were originally derived for a rigid ...

A proton NMR method for the determination of the solvation numbers of alkaline earth cations with dimethylsulfoxide (DMSO) in nitromethane as diluent is described. The method is based on the monitoring of the resonance frequency of DMSO protons as a function of DMSO to metal ion mole ratio while keeping the metal ion concentration constant. The average solvation number of cations at any...

We present and discuss results obtained in studies of the mechanisms underlying various feature size dependencies of SiO2 etching in inductively coupled fluorocarbon plasmas. The variation of the fluorocarbon deposition rate and the SiO2 etch rate with both feature size and rf bias power has been measured in a variety of constant aspect ratio features for both an etch stop (C3F6 /H2) and a none...

An improved theoretical approach is proposed to predict the dynamic behavior of long, slender and flexible microcantilevers affected by squeeze-film damping at low ambient pressures. Our approach extends recent continuum gas damping models (Veijola 2004 J. Micromech. Microeng. 14 1109–18, Gallis and Torczynski 2004 J. Microelectromech. Syst. 13 653–9), which were originally derived for a rigid ...

While KDP and DKDP crystals remain the only viable solution for frequency conversion in large aperture laser systems in the foreseeable future, our understanding of damage behavior in the presence of multiple colors is very limited. Such conditions exist during normal operation where, for third harmonic generation, 1ω, 2ω and 3ω components are present with different energy ratios as they propag...

This paper proposes a new method for speaker identification, which based on the non-uniformly distributed speaker information in frequency bands. In order to discard the linguistic information effectively, in this study, we adopt an improved Fisher’s F-ratio called the phoneme mean F-ratio to measure the dependences between frequency components and individual characteristics. Then we adopt an a...

The detailed analysis of measured interferograms generally requires phase correction. Phase-shift correction methods are commonly used and well documented for conventional Fourier-transform spectroscopy. However, measured interferograms can show additional phase errors, depending on the optical path difference and signal frequency, which we call phase distortion. In spatial heterodyne spectrosc...