Search results for: SONAR EQUIPMENT , NAVIGATION , MATHEMATICAL MODEL , ACOUSTIC WAVES , UNDERWATER VEHICLES , DOPPLER SHIFT

• Propagation of guided elastic waves in shell-type aircraft structural elements

  Publication

  • A. Żak
  • M. Krawczuk
  • W. Ostachowicz

  - Year 2010

  W pracy przedstawiony powłokowy spektralny element skończony do analizy zjawiska propagacji fal sprężystych w elementach konstrukcyjnych typu powłokowego.

• Deep learning approach for delamination identification using animation of Lamb waves

  Publication

  • S. Ullah
  • A. Ijjeh
  • P. Kudela

  - Engineering Applications of Artificial Intelligence - Year 2023

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• Deep learning super-resolution for the reconstruction of full wavefield of Lamb waves

  Publication

  • A. Ijjeh
  • S. Ullah
  • M. Radzienski
  • P. Kudela

  - Mechanical Systems and Signal Processing - Year 2023

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• Guided waves in steel rails - experimental works and wavelet signal processing

  Publication

  • M. Rucka
  • K. Wilde

  - Key Engineering Materials - Year 2007

  W artykule zaprezentowano analizę falkową pomierzonych eksperymentalnie fal sprężystych wzbudzanych w szynach kolejowych.

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• Guided Waves in Steel Rails – Experimental Works and Wavelet Signal Processing

  Publication

  • M. Rucka
  • K. Wilde

  - Year 2007

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• Acousto-optic interaction with the use of cylindrical ultrasonic waves in the laser cavity

  Publication

  • I. Grulkowski
  • D. Jankowski
  • P. Kwiek

  - APPLIED OPTICS - Year 2009

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• Propagation of elastic waves in structural elements by spectral finite element methods

  Publication

  • A. Żak
  • W. Ostachowicz
  • M. Krawczuk

  - Year 2009

  W pracy przedstawiono metodę elementów spektralnych w zastosowaniu do analizy propagacji fal sprężystych w elementach konstrukcyjnych.

• Guided waves for monitoring of plate structures with linear cracks of variable length

  Publication

  • B. Zima
  • M. Rucka

  - Archives of Civil and Mechanical Engineering - Year 2016

  Damage occurring at the work of plate structures may grow to a considerable size. The joint action – the detection of a defect at the earliest possible stage, the monitoring of its growth and the determination of its critical size in the context of structural reliability allows optimizing the cost of the maintenance and repair of structural elements. Thus the development of monitoring systems for permanent observation of fault...

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• Shiyou Huagong Shebei/ Petro-Chemical Equipment

  Journals

  ISSN: 1000-7466

• Mathematical Modelling of a Seismic Isolation System to Protect Structures during Damaging Earthquakes

  Publication

  • T. Falborski
  • B. Sołtysik
  • R. Jankowski

  - Key Engineering Materials - Year 2016

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• A single and triple-objective mathematical programming models for assignment of services in a healthcare institution

  Publication

  • B. Sawik

  - International Journal of Logistics Systems and Management - Year 2013

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• The process of fuzzy model development for the case of polish internet mortgage market

  Publication

  • A. Orłowski
  • E. Szczerbicki

  - Journal of Internet Banking and Commerce - Year 2010

  The aim of the paper is to present the conceptual description of fuzzy model representing the Polish Internet mortgage market. The first part of the paper consists of assessment and verification of model variables which are important for the Polish Internet Mortgage Market. This process begins with the initial set of variables which was used previously for the rule based model of the same market. As numerous aspects of the market...

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• On numerical calculation of acoustic field of plane source.

  Publication

  • S. Leble
  • A. Sukhov

  - TASK Quarterly - Year 2003

  Składowe harmoniczne wiązki akustycznej zostały obliczone na podstawie reprezentacji w postaci całek według teorii reprezentacji. Zastosowano nowe metody do obliczania całek od funkcji szybko oscylacyjnych.

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• Thermal lenses caused by any acoustic source.

  Publication

  • A. Perelomova

  - HYDROACOUSTICS - Year 2003

  Nieliniowe straty energii fali akustycznej doprowadzają do powstania obszarów ogrzanych, to znaczy obszarów o innej prędkości fali akustycznej niż pozostała przestrzeń. Soczewki termiczne wywoływane przez propagację fal akustycznych okresowych i nieokresowych są rozpatrywane. Przedstawiono ilustrację obliczeń numerycznych.

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• Web Based Acoustic Noise Measurement System.

  Publication

  • A. Czyżewski
  • J. Kotus

  - Year 2004

  W referacie przedstawiono projekt multimedialnego systemu przeznaczonego do monitorowania zagrożeń hałasem środowiskowym. Nadrzędnym celem realizowanego projektu jest zwiększenie efektywności profilaktyki chorób słuchu. Opracowywany system umożliwia odbiór, przechowywanie danych, analizę i wizualizację wyników pomiarów hałasu pozyskanych od urządzeń pomiarowych za pośrednictwem Internetu. Przedstawiono również opracowanie miernika...

• Microscopic parameters of gas via acoustic measurements

  Publication

  • M. Kuśmirek-Ochrymiuk
  • S. Leble

  - Year 2005

  Proponujemy wstępną analizę odwrotnego problemu, który sformułowano, opartą na statycznej mechanice /termodynamice, rozważającej gaz jako środek rozprzestrzeniania dzwięku.

• Diagnostics of high-voltage varistors by acoustic emission

  Publication

  • L. Hasse
  • J. Smulko
  • L. Kaczmarek

  - Year 2010

  Warystory, szeroko stosowane w ogranicznikach przepięć, powinny być testowane na końcowym etapie ich wytwarzania. Stosowane metody testowania wymagają użycia wysokich napięć i prądów o dużych natężeniach, co jest nidogodne, destrukcyjne i wymaga poboru relatywnie dużych pocy. W artykule zaproponowano zastosowanie analizy sygnału emisji akustycznej do predykcji jakości struktury warystora. Opisano system przygotowany do tej aplikacji,...

• Acoustic verification on onomatopoeic sets in contrastive approach

  Publication

  • K. Wojan

  - Archives of Acoustics - Year 2008

• Acoustic verification on onomatopoeic sets in contrastive approach

  Publication

  • K. Wojan

  - Year 2008

• Photo-acoustic response of active biological systems

  Publication

  • N. Gouskos
  • K. Aidinis
  • G. Papadopoulos
  • J. Majszczyk
  • J. Typek
  • J. Rybicki
  • M. Maryniak

  - OPTICAL MATERIALS - Year 2008

  Zbadano dwie próbki organiczne gatunku Trunculariopsis trunculus,jedną wilgotną, drugą - suchą. W obu przypadkach zaobserwowanointensywne szerokie pasma absorpcyjne w zakresie widzialnym (żółtymi poniżej 330 nm). Widma foto-akustyczne zawierają wszystkie pasma uznane za związane z aktywnością biologiczną.

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• On statistical linear inverse problems in fishery acoustic

  Publication

  • M. Moszyński

  - HYDROACOUSTICS - Year 2007

  .

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• Acoustic heating in a weakly dispersive fluid flow

  Publication

  • A. Perelomova

  - ACTA ACUSTICA UNITED WITH ACUSTICA - Year 2008

  Zbadano specyficzną rolę dyspersyjnych własności płynu w generacji ogrzewania przez straty energii fali akustycznej. Przedstawiono ilustracje zaistniałego ogrzewania powstającego na skutek przejścia dwoch typów fal - impulsowej i stacjonarnej.

• Vowel recognition based on acoustic and visual features

  Publication

  • P. Dalka
  • B. Kostek
  • A. Czyżewski

  - Archives of Acoustics - Year 2006

  W artykule zaprezentowano metodę, która może ułatwić naukę mowy dla osób z wadami słuchu. Opracowany system rozpoznawania samogłosek wykorzystuje łączną analizę parametrów akustycznych i wizualnych sygnału mowy. Parametry akustyczne bazują na współczynnikach mel-cepstralnych. Do wyznaczenia parametrów wizualnych z kształtu i ruchu ust zastosowano Active Shape Models. Jako klasyfikator użyto sztuczną sieć neuronową. Działanie systemu...

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• Fish size distribution from acoustic data

  Publication

  • M. Moszyński
  • E. Ona
  • R. Korneliussen
  • P. Geir

  - Year 2006

  .

• Pressure Dependence of Acoustic Modes in AgGaSe 2

  Publication

  • P. Derollez
  • S. Klotz
  • J. Ażewski
  • M. Braden
  • B. Hennion
  • R. Fouret
  • J. Gonzalez

  - HIGH PRESSURE RESEARCH - Year 2002

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• Improvement of glass break acoustic signal detection via application of wavelet packet decomposition

  Publication

  • I. Bemke
  • R. Zielonko

  - Metrology and Measurement Systems - Year 2008

  The main subject of the authors' research are non-contact methods of glass break detection based on analysis of the acoustic signal generated during the event. This problem has essential meaning for modern cost- effective alarm systems, particularly those installed into big buildings. The main difficulties of the matter are: transient character of the signal, great number of similar sounds (false signals, mainly accidental glass...

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• The Positioning Accuracy of BAUV Using Fusion of Data from USBL System and Movement Parameters Measurements

  Publication

  • N. Krzysztof
  • A. Nowak

  - SENSORS - Year 2016

  The article presents a study of the accuracy of estimating the position coordinates of BAUV (Biomimetic Autonomous Underwater Vehicle) by the extended Kalman filter (EKF) method. The fusion of movement parameters measurements and position coordinates fixes was applied. The movement parameters measurements are carried out by on-board navigation devices, while the position coordinates fixes are done by the USBL (Ultra Short Base...

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• Detection of Objects Buried in the Sea Bottom with the Use of Parametric Echosounder

  Publication

  • E. Kozaczka
  • G. Grelowska
  • S. Kozaczka

  - Archives of Acoustics - Year 2013

  The paper contains results of a in situ research main task of which was to detect objects buried, partially or completely, in the sea bottom. Object detecting technologies employing acoustic wave sources based on nonlinear interaction of elastic waves require application of parametric sound sources. Detection of objects buried in the sea bottom with the use of classic hydroacoustic devices such as the sidescan sonar or multibeam...

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• Problems of inland navigation in Poland in view of integrated water resources management (IWRM)

  Publication

  • T. Jarzębińska

  - Year 2007

  W artykule przedstawiono zasady zintegrowane zarządzania gospodarką wodna. Przedstawiono rolę żeglugi środlądowej w gospodarce wodnej Polski i krajów czlonkowskich Unii Europejskiej. Przedstawiono aktualny stan dróg wodnych w Polsce, ograniczenia rozwoju i perspektywy na przyszłośc z punktu widzenia ZZGW.

• Comparison of Single and Multi-Population Evolutionary Algorithm for Path Planning in Navigation Situation

  Publication

  • Ł. Kuczkowski
  • R. Śmierzchalski

  - Solid State Phenomena - Year 2014

  In this paper a comparison of single and multi-population evolutionary algorithm is presented. Tested algorithms are used to determine close to optimal ship paths in collision avoidance situation. For this purpose a path planning problem is defined. A specific structure of the individual path and fitness function is presented. Principle of operation of single-population and multi-population evolutionary algorithm is described....

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• THE CONCEPT OF INTEGRATED SYSTEM FOR COLLECTING GEOGRAPHIC AND HYDROGRAPHIC DATA FOR NAVIGATION PURPOSES IN RIS

  Publication

  • C. Specht

  - Year 2018

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• The metagenomic approach to characterization of the microbial community shift during the long-term cultivation of anammox-enriched granular sludge

  Publication

  • S. Ciesielski
  • K. Czerwionka
  • D. Sobotka
  • T. Dulski
  • J. Mąkinia

  - JOURNAL OF APPLIED GENETICS - Year 2018

  A metagenomic approach was used to investigate how the microbial community composition changes when an anammox-based granular sludge reactor is seeded with nitritation-anammox biomass from a wastewater treatment plant. In the seed sample, the abundance of Candidatus Kuenenia stuttgartiensis was similar to Candidatus Jettenia caeni (12.63 vs. 11.68%). This biomass was typical in terms of microbial nitrogen conversion; both ammonia...

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• Structural change in New Member States (1995-2005): shift-share analysis of productivity growth and its determinants

  Publication

  • A. Parteka

  - Year 2011

  The chapter focuses on the latest developments in ten New MemberStates (presented vis-à-vis EU-15countries), seen from the perspective of structural change and quality upgrading of their economic structures. In particular, recently released disaggregated labor statistics are used,allowing to analyse the process of labor reallocation and productivitychanges associated with inter-and intra-industrystructural change. Since the mid-1990s...

• Structural Change in New Member States (1995–2005): Shift–Share Analysis of Productivity Growth and its Determinants

  Publication

  • A. Parteka

  - Year 2011

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• Web 2.5 as a safe shift from Web 2.0 to Web 3.0: A definition of Web 2.5 in informatological approach

  Publication

  • H. Gaweł

  - Year 2022

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• Experiment with small objects floating under water in the harbor security aspect.

  Publication

  • G. Grelowska
  • E. Kozaczka
  • S. Kozaczka

  - Year 2013

  Observation of the underwater area is the element of general trend which primary purpose is to protect and enhance the safety of the selected region. The aim of the paper is to present the acoustic characteristics of typical objects floating on the surface or under the water, which constitute some knowledge on how to detect these objects. Create a catalog of acoustic signatures and acoustic images of objects mostly floating under...

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• Underwater communication system for shallow water using modified MFSK modulation

  Publication

  • J. Schmidt
  • K. Zachariasz
  • R. Salamon

  - Year 2005

  Opisano budowę i zasadę działania systemu komunikacji podwodnej z modulacją MMFSK. System służy do przekazywania danych i komend ze statku do obiektów podwodnych w płytkich wodach przybrzeżnych i jeziorach. Priorytetowe wymagania postawione systemowi to bardzo małe zużycie energii w części podwodnej i bardzo mała liczba błędów transmisji. Szczególną uwagę zwrócono na nietypowe źródło błędów, jakim są zniekształcenia nieliniowe...

• Influence of Fin’s Material Capabilities on the Propulsion System of Biomimetic Underwater Vehicle

  Publication

  • P. Piskur
  • P. Szymak
  • Z. Kitowski
  • L. Flis

  - Polish Maritime Research - Year 2020

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• Effect of welding conditions on susceptibility to cold cracking of underwater welded joints

  Publication

  • D. Fydrych
  • T. Kozak

  - Year 2006

  Przedstawiono wybrane aspekty spawalności stali przy spawaniu pod wodą metodą lokalnej komory suchej. Zwrócono szczególną uwagę na skłonność do tworzenia peknięć zimnych w SWC. Przy pomocy planowania doświadczeń określono ilościowy wpływ parametrów spawania na naprężenia krytyczne z próby implant.

• Effect of electrode waterproof coating on quality of underwater wet welded joints

  Publication

  • J. Tomków
  • D. Fydrych
  • K. Wilk

  - Materials - Year 2020

  In this paper, the effects of different hydrophobic coatings on the surface of covered electrodes on the quality of wet welded carbon steel joints were discussed. Commonly available hydrophobic substances used in industrial applications were selected for the research. The aim of using waterproof coatings was to check the possibility to decreasing the susceptibility of highstrength low-alloy S460N steel to cold cracking. During...

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• Tuning of food wastes bioavailability as feedstock for bio-conversion processes by acoustic cavitation and SPC, SPS, or H2O2 as external oxidants

  Publication

  • Z. Askarniya
  • L. Kong
  • C. Wang
  • S. H. Sonawane
  • J. Mąkinia
  • G. Boczkaj

  - CHEMICAL ENGINEERING AND PROCESSING - Year 2024

  The growing amount of food wastes makes them a suitable source for the generation of bioproducts through anaerobic digestion. Appropriate hydrolysis of the feedstock can enhance the efficiency of production of desired products. In this work, acoustic cavitation (AC) was employed as a pretreatment method to enhance hydrolysis stage by the modification of model (potato-based) food waste for increase in soluble chemical oxygen demand...

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• Representation of magnetic hysteresis in tape wound core using feedback Preisach model

  Publication

  • A. Wilk

  - Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej - Year 2013

  This paper presents a mathematical model for the hysteresis phenomenon in ferromagnetic tape wound core. The feedback scalar Preisach model of hysteresis is used to simulate magnetic behavior of the grain oriented silicon strip of ET114-27 type. Determination of B-H hysteretic curve is based on measurement of the initial magnetization curve and the main hysteresis loop. The Preisach distribution function (PDF) of ET114-27 material...

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• Gdansk 2020, Strzelecka (N) street - video data - pedestrian, bicycles, vehicles

  Open Research Data

  open access

  • W. Kustra
  • R. Włodkowski
  • D. Stawicka
  • D. Bytner

  - series: Gdansk 2020 - video data - pedestrian, bicycles, vehicles

  The data contain video traffic data (pedestrian, cyclists, vehicles) registered at Strzelecka street. Date 06.08.2020, 6:00-20:00. The video camera was installed around bicycle crossings and pedestrian crossings at Strzelecka  - Nowe Ogrodycrossing. Camera was mounted on 7-meter-high mast.

• Gdansk 2020, Krynicka (N) street - video data - pedestrian, bicycles, vehicles

  Open Research Data

  open access

  • W. Kustra
  • R. Włodkowski
  • D. Stawicka
  • D. Bytner

  - series: Gdansk 2020 - video data - pedestrian, bicycles, vehicles

  The data contain video traffic data (pedestrian, cyclists, vehicles) registered at Krynicka (N) street. Date 11.08.2020, 6:00-20:00. The video camera was installed around bicycle crossings and pedestrian crossings at Krynicka - Kolobrzeska crossing. Camera was mounted on 7-meter-high mast.

• Navigation-Journal of the Institute of Navigation

  Journals

  ISSN: 0028-1522 , eISSN: 2161-4296

• Four-state stochastic model of changes in the reliability states of a motor vehicle

  Publication

  • J. Girtler
  • M. Ślęzak

  - Eksploatacja i Niezawodność - Maintenance and Reliability - Year 2013

  The properties of semi-Markov processes have been generally characterized and the applicability of the theory of such processes to the determining of the reliability of motor cars and other road vehicles has been explained. A formal description of the process of changes in the motor vehicle technical states considered as reliability states and a model of this process in the form of a one-dimensional stochastic process have been...

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• Effect of temperature and ionic strength on volumetric and acoustic properties of solutions of urea alkil derivatives in aqueous NaCl

  Publication

  • J. Krakowiak
  • J. Wawer

  - JOURNAL OF CHEMICAL THERMODYNAMICS - Year 2015

  The present work was undertaken to study volumetric and acoustic properties for diluted solutions of tetramethylurea in pure water and for urea, n-propylurea, n-butylurea and tetramethylurea in 0.5 or 1 moldm3 aqueous solutions of sodium chloride. This paper presents measured values of densities and sound velocities at T = (288.15, 298.15 and 308.15) K. From these data the apparent molar volumes, , adiabatic compressibilities,...

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• Changes in conditions of acoustic wave propagation in the Gdansk deep as an effect of climate changes in the Baltic Sea region

  Publication

  • G. Grelowska
  • E. Kozaczka

  - MARINE POLLUTION BULLETIN - Year 2020

  The article presents the results from a research project investigating acoustic climate changes in the Gdansk Deep based on data extending from 1902 to 2019. This part of the southern Gotland Basin, is rarely discussed in the scientific literature. The speed of sound in the seawater is a function of temperature, salinity, and depth. In such shallow sea as Baltic Sea, the impact of depth is not substantial. The other two factors...

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• S14 2019 - video data - pedestrian, bicycles, vehicles

  Open Research Data

  open access

  • Ł. Jeliński
  • W. Kustra
  • K. Jamroz
  • D. Bytner

  S14 2019 - video data - pedestrian, bicycles, vehicles

• Mathematical and Numerical Modelling, L, IDE IInd, sem.01, summer, 2022/23(00057379)

  e-Learning Courses

  • K. J. Kaliński

  Modelling of controlled mechanical systems by the mixed method of rigid and flexible finite elements: The finite element volume problems. Dynamics of multibody systems. Modelling of stationary closed loop systems. Modelling of systems whose configuration changes with time. Modelling of nonlinear controlled systems. Optimal control at energy performance index: Control of continuous nonstationary systems in domain of generalised...