Search results for: power spectral density

• The power spectral density of audible noise and electric disturbances in ship’s electrical drive systems with frequency converters

  Open Research Data

  open access

  • B. Pałczyńska

  The presented dataset is part of research focusing on the impact of the ship's electrical drive systems with frequency converters on vibrations and the level of audible noise on ships.

• Spectral density distribution moments as novel descriptors for QSAR/QSPR

  Publication

  • D. Bielińska-Wąż
  • P. Wąż
  • K. Jagiełło
  • T. Puzyn

  - STRUCTURAL CHEMISTRY - Year 2014

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• Noise spectral density computation based on finite element model of piezoceramic sensor

  Publication

  • P. Sedlak
  • J. Majzner
  • L. Grmela
  • L. Hasse

  - Year 2006

  The high sensitivity with wide bandwidth is required for sensor applications in non-destructive testing (NDT). The sensitivity of piezoceramic sensors demands to minimize their noise especially thermal noise, polarisation noise and low frequency 1/f noise,which are the main sources of voltage or current fluctuation in this sort of sensors. For simplicity, only the piezoceramic part of sensor was under study. the theoretical and...

• Uncertainty in measuring the power spectrum density of a random signal

  Publication

  • B. Pałczyńska
  • L. Spiralski

  - Year 2005

  Przedstawiono sposób oszacowania niepewności wyznaczania gęstości widmowej mocy przebiegu losowego. Przeprowadzono ocenę niepewności estymacji gęstości widmowej mocy biorąc pod uwagę propagację niepewności związanej z rejestracją pojedynczej próbki sygnału w algorytmie cyfrowego przetwarzania sygnału oraz błąd obciążenia estymatora wynikający z zastosowanego modelu matematycznego wielkości wyznaczanej. Wyprowadzono zależności na...

• Innovative Bidirectional Isolated High-Power Density On-Board Charge for Vehicle-to-Grid

  Publication

  • R. Hrbáč
  • L. Hrdina
  • V. Kolar
  • Z. Slanina
  • V. Blazek
  • T. Vantuch
  • M. Bartłomiejczyk
  • S. Misak

  - SENSORS - Year 2022

  This paper deals with developing and implementing a bidirectional galvanically isolated on-board charger of a high-power density. The power density of the new charger was 4 kW/kg and 2.46 kW/dm3, and the maximum efficiency was 96.4% at 3.4 kW. Due to the requirement to achieve a high-power density, a single-stage inverter topology was used. Regarding switching losses, due to the topology of the circuit with so-called hard switching,...

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• Spectral analysis of nonstationary low-frequency magnetic-field emissions from ship's power

  Publication

  • F. Converters
  • B. Palczynska
  • B. Pałczyńska

  - Year 2009

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• Measurements of Dispersed Phase Velocity in Two-Phase Flows in Pipelines Using Gamma-Absorption Technique and Phase of the Cross-Spectral Density Function

  Publication

  • R. Hanus
  • M. Zych
  • A. Golijanek-Jędrzejczyk

  - ENERGIES - Year 2022

  This paper concerns the application of the gamma radiation absorption method in the measurements of dispersed phase velocity in two-phase flows: liquid–gas flow in a horizontal pipe- line and liquid–solid particles in a vertical pipe. Radiometric sets containing two linear 241Am gamma radiation sources and two NaI(Tl) scintillation detectors were used in the research. Due to the stochastic nature of the signals obtained from the...

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• Effect of Electron Beam Power Density on the Structure of Titanium Under Non-Vacuum Electron-Beam Treatment

  Publication

  • I. Ivanov
  • A. Thoemmes
  • V. Skiba
  • A. Ruktuev
  • I. Bataev

  - METAL SCIENCE AND HEAT TREATMENT - Year 2019

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• Efficiency of gas detection algorithms using fluctuation enhanced sensing

  Publication

  • Ł. Lentka
  • J. Smulko
  • R. Ionescu

  - Year 2015

  Efficiency of various gas detection algorithms by applying fluctuation enhanced sensing method was discussed. We have analyzed resistance noise observed in resistive WO3- nanowires gas sensing layers. Power spectral densities of the recorded noise were used as the input data vectors for two algorithms: the principal component analysis (PCA) and the support vector machine (SVM). The data were used to determine gas concentration...

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• Gas Detection Using Resistive Gas Sensors And Radial Basis Function Neural Networks

  Publication

  • Ł. Lentka
  • J. Smulko
  • O. Gualdron
  • R. Ionescu

  - Year 2016

  We present a use of Radial Basis Function (RBF) neural networks and Fluctuation Enhanced Sensing (FES) method in gas detection system utilizing a prototype resistive WO3 gas sensing layer with gold nanoparticles. We investigated accuracy of gas detection for three different preprocessing methods: no preprocessing, Principal Component Analysis (PCA) and wavelet transformation. Low frequency noise voltage observed in resistive gas...