Search results for: DEW FREQUENCY

• Dew and hoarfrost frequency, formation efficiency and chemistry in Wroclaw, Poland

  Publication

  • G. Gałek
  • M. Sobik
  • M. Błaś
  • Ż. Polkowska
  • K. Cichała-Kamrowska
  • K. Wałaszek

  - ATMOSPHERIC RESEARCH - Year 2015

  This article presents the results of a research study concerning a comparison of frequency, formation efficiency and basic physico-chemical properties of dew and hoarfrost in urban conditions. Longer than two-year series of measurements was carried out from 1 February 2008 to 10 March 2010 in Wroclaw, Poland. Sampling of atmospheric deposits was made by means of insulated plain passive radiative condensers, which allowed to collect...

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• FREQUENZ

  Journals

  ISSN: 0016-1136 , eISSN: 2191-6349

• Low-frequency noise in ZrS3 van der Waals semiconductor nanoribbons

  Publication

  • A. Rehman
  • G. Cywiński
  • W. Knap
  • J. Smulko
  • A. Balandin
  • S. Rumyantsev

  - APPLIED PHYSICS LETTERS - Year 2023

  We report the results of the investigation of low-frequency electronic noise in ZrS3 van der Waals semiconductor nanoribbons. The test structures were of the back-gated field-effect-transistor type with a normally off n-channel and an on-to-off ratio of up to four orders of magnitude. The current–voltage transfer characteristics revealed significant hysteresis owing to the presence of deep levels. The noise in ZrS3 nanoribbons...

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• IEEE Journal of Radio Frequency Identification

  Journals

  eISSN: 2469-7281

• A new class of eigenfunction expansion methods for fast frequency-domain analysis of waveguides

  Publication

  • P. Przybyszewski
  • J. Mielewski
  • M. Mrozowski

  - IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES - Year 2002

  Zaprezentowano nową technikę szybkiego obliczania charakterystyk dyspersyjnych falowodów z niejednorodnym wypełnieniem. Metoda ta oblicza przybliżone wartości stałej propagacji dla wymaganej częstotliwości, bazując na bardziej dokładnych wyliczeniach rozkładu pola i stałej propagacji dla kilku wybranych punktów częstotliwości.

• From the multiple frequency tracker to the multiple frequency smoother

  Publication

  • M. Niedźwiecki

  - Year 2008

  The problem of extraction/elimination of nonstationary sinusoidalsignals from noisy measurements is considered. This problem is usually solved using adaptive notch filtering (ANF)algorithms. It is shown that the accuracy of frequency estimates can be significantly increased if the results obtained from ANF are backward-time filtered by an appropriately designed lowpass filter. The resulting adaptive notch smoothing (ANS)algorithm...

• New high-gain step-up DC/DC converter with high-frequency isolation

  Publication

  • D. Vinnikov
  • J. Zakis
  • O. Husev
  • R. Strzelecki

  - Year 2012

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• A new approach to active noise and vibration control - [Part I: the known frequency case]

  Publication

  • M. Niedźwiecki
  • M. Meller

  - Year 2009

  This paper presents a new approach to rejection of complex-valued sinusoidal disturbances acting at the output of a discrete-time stable linear plant with unknown dynamics. It is assumed that the frequency of the sinusoidal disturbance is known, and that the output signal is contaminated with wideband measurement noise. The disturbance rejection control rule is first derived and analyzed for a nominal plant model, different from...

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• A new approach to active noise and vibration control - [Part II: unknown frequency case]

  Publication

  • M. Niedźwiecki
  • M. Meller

  - Year 2009

  This paper presents a new approach to rejection of complex-valued sinusoidal disturbances acting at the output of a discrete-time stable linear plant with unknown and possibly timevarying dynamics. It is assumed that both the instantaneous frequency of the sinusoidal disturbance and its amplitude may be slowly varying with time and that the output signal is contaminated with wideband measurement noise. It is not assumed that a...

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• A new time-frequency detection method of stray current field interferenceon metal structures.

  Publication

  • K. Darowicki
  • K. Żakowski

  - CORROSION SCIENCE - Year 2004

  A new detection method has been presented of stray current field interference on underground metal structures. The method employs short time Fourier transformation (STFT). This method of analysis allows determination of signal spectral power density changes (e.g., structure potential) in the function of time. In the paper results have been presented of total time–frequency analysis of a pipeline potential in a stray current field...

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