Search results for: PWV/IWV

• Atmospheric opacity estimation based on IWV derived from GNSS observations for VLBI applications

  Publication

  • G. Nykiel
  • P. Wolak
  • M. Figurski

  - GPS SOLUTIONS - Year 2018

  Thermal emission of atmospheric water vapor has a great influence on the calibration of radio astronomical observations at millimeter wavelengths. The phenomenon of an atmospheric water vapor emits noise signal and attenuates astronomical emission. At 22 GHz, integrated water vapor (IWV) obtained from global navigation satellite systems (GNSS) is strictly related to atmospheric opacity (τ0), which is a crucial parameter for data...

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• Assessment of the Impact of GNSS Processing Strategies on the Long-Term Parameters of 20 Years IWV Time Series

  Publication

  • Z. Baldysz
  • G. Nykiel
  • M. Figurski
  • A. Araszkiewicz

  - Remote Sensing - Year 2018

  Advanced processing of collected global navigation satellite systems (GNSS) observations allows for the estimation of zenith tropospheric delay (ZTD), which in turn can be converted to the integrated water vapour (IWV). The proper estimation of GNSS IWV can be affected by the adopted GNSS processing strategy. To verify which of its elements cause deterioration and which improve the estimated GNSS IWV, we conducted eight reprocessings...

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• Influence of preprocessing techniques on pulse pressure velocity determination

  Publication

  • A. Poliński
  • A. Bujnowski
  • T. Kocejko
  • J. Wtorek

  - Year 2021

  Pulse Wave Velocity (PWV) is measured and utilized in many clinical applications. Recently, a wide research has been led to develop a cuff-less and continuous blood pressure method basing on PWV. However, in this application a decision on choosing an appropriate fiducial point of pulse wave (PW) waveform is necessary and substantial. It would allow to measure time parameters necessary to determine PWV. An influence of sampling...

  Full text to download in external service

• Displacement control in PWK-type pumps

  Publication

  • L. Osiecki
  • P. Śliwiński

  - Year 2009

  W referacie zaprezentowano konstrukcję mechanizmu sterowania wydajnością zastosowanego w pompach z rozrządem krzywkowym typu PWK. Przedstawiono wyniki wstępnych badań prototypu PWKZ-78 oraz komputerową analizę zjawisk zachodzących w komorze cylindrowej pompy.

• Displacement control in PWK-type pumps

  Publication

  • P. Śliwiński
  • L. Osiecki

  - Year 2010

  The most important, strategic goal however is creation of the variable displacement version of the new pump PWK. Thanks to full discharge of it's commutation mechanism from hydrostatic forces the variable pump can be directly controlled by low-energy actuator like proportional electromagnet or stepping motor. It means that costly and complicated hydraulic servomechanism (applied in all present variable displacement pumps) is no...

• Hourly GNSS-derived integrated moisture in the global tropics for the years 2001-2018

  Open Research Data

  open access

  • G. Nykiel
  • M. Figurski
  • Z. Bałdysz

  Global tropics are essential in formulating weather patterns and climate across various latitudes through atmospheric teleconnections. Since water vapour is an essential parameter in atmospheric convection and, thus, latent heat release, its tropical variability on different time scales is crucial in understanding weather and climate changes. The provided...

• Kompensacja skoków ciśnienia w pompie pwk

  Publication

  • P. Patrosz

  - Year 2012

  Opisane w tej pracy zagadnienia opisują wpływ zastosowania komory kompensacyjnej w pompie PWK na wartość skoków ciśnienia w komorach roboczych.

• Opinion about causes of framing of Kingston chest (box cooler) damage, on PSV vessel VS4411 DF-PSV (B-855)

  Publication

  • J. Kozak
  • J. Kowalski
  • D. Duda

  - Year 2014

  The subject of analysis is a damage of welded connection of box cooler framing segments, made as separate bars 50mm thickness, connected by the welds in corners. Studies of documents delivered by Customer shows cracks on the fusion of filet welds and twisting of box cooler frame. The subject of analysis is a damage of welded connection of box cooler framing segments, made as separate bars 50mm thickness, connected by the welds...

• Destructive impact of PWM inverters on traction AC motors

  Publication

  • J. Łuszcz
  • P. Dworakowski

  - ELECTROMOTION - Year 2010

  The electric traction drives with an AC motor fed by a frequency converter are used more and more often nowadays. The most significant side effects, of a converter's output voltage forming PWM method for AC motor windings, are steep voltage changes, which can initiate several destructive phenomena. The paper presents the adverse influence of a converter common mode voltage on the motor windings's increased voltage exposure and...

• Computer analysis of dynamic phenomena in PWK-type pumps

  Publication

  • L. Osiecki
  • J. Piechna
  • T. Zawistowski

  - Year 2009

  Referat przedstawia wstępne wyniki analizy CFD dynamicznych zmian ciśnienia zachodzących w komorze cylindrowej pompy z rozrządem krzywkowym PWKZ-95. Analizy prowadzono dla pompy wyposażonej w elastyczną komorę kompensacyjną oraz dla pompy bez kompensacji.