Search results for: SHALLOW WATER ACOUSTICS

• NEW CONCEPT OF HYBRID PROPULSION WITH HYDROSTATIC GEAR FOR INLAND WATER TRANSPORT

  Publication

  • D. Piątek

  - Polish Maritime Research - Year 2019

  The article presents the development of author’s concept of a diesel/hydraulic propulsion system for inland watercraft. Due to specific nature of vessel navigation on rivers, classical propulsion systems with shaft lines can be effectively replaced by systems with hydraulic power transmission. A solution is also presented of a hybrid design with extra electric port having the form of a pumping system driven from a battery of accumulators....

  Full text available to download

• A COMPARISON OF WEAR PROPERTIES OF WATER LUBRICATED NBR AND PTFE SLIDING BEARINGS

  Publication

  • E. Wojtowicz

  - TRIBOLOGIA - Year 2019

  The excessive wear of a journal shaft can be caused by many factors, for example, working conditions (e.g., temperaturę, slip speed, the type of lubricant), pressure, the type of material used on the bearings and shafts and their roughness, as well as contamination remaining in the system. This paper presents the roughness profiles co-operating with a rubber (NBR) and polytetrafluoroethylene (PTFE) bushes. The conditions of cooperation...

  Full text available to download

• Effect of free water on the quasi‑static compression behavior of partially‑saturated concrete with a fully coupled DEM/CFD approach.

  Publication

  • M. Krzaczek
  • J. Tejchman
  • M. Nitka

  - GRANULAR MATTER - Year 2024

  The work aims to numerically investigate the quasi-static response of partially fluid-saturated concrete under two-dimensional uniaxial compression at the mesoscale. We investigated how the impact of free pore fluid content (water and gas) affected the quasi-static strength of concrete. The totally and partially fluid-saturated concrete behavior was simulated using an improved pore-scale hydro-mechanical model based on DEM/CFD....

• Dispersive Micro‐Solid Phase Extraction of Selected Metals in Water and Food Samples Followed by ICP‐OES Analysis: Method Development, Analysis of Real Samples and Greenness Evaluation

  Publication

  • M. Sajid
  • M. Kabeer
  • M. K. Nazal
  • M. Younas
  • J. Płotka-Wasylka

  - ChemistrySelect - Year 2024

  Multiwalled carbon nanotubes (MWCNTs) are well-known adsorbents because of their high surface area, layered and hollow architecture, hydrophobicity, and multiple and easily accessible adsorption sites. In this study, MWCNTs were used for dispersive micro-solid-phase extraction of various metal chelates in environmental and food samples. Different parameters such as concentration of the chelating reagent, the sorbent dosage, the...

  Full text to download in external service

• IEEE International Conference on Acoustics, Speech and Signal Processing

  Conferences

• Actual field corrosion rate of offshore structures in the Baltic Sea along depth profile from water surface to sea bed

  Publication

  • J. Orlikowski
  • M. Szociński
  • K. Żakowski
  • P. Igliński
  • K. Domańska
  • K. Darowicki

  - OCEAN ENGINEERING - Year 2022

  The paper presents the results of field electrochemical investigations on the corrosion rate of carbon steel in seawater of the Baltic Sea at the location of the Baltic Beta production rig. The measurements were conducted throughout the year in seawater at different depths from the sea surface to the sea bed (about 75 m). The results revealed corrosion aggressiveness of the seawater along the entire depth profile. There was...

  Full text to download in external service

• Study of probe signal bandwidth influence on estimation of coherence bandwidth for underwater acoustic communication channel

  Publication

  • I. Kochańska
  • J. Schmidt
  • A. Schmidt

  - APPLIED ACOUSTICS - Year 2021

  A signal transmitted in a shallow Underwater Acoustic Communication (UAC) channel suffers from time dispersion due to the multipath propagation and the refraction phenomena. This causes intersymbol interference of the received signal and frequency-selective fading observed in its spectrum. Coherence bandwidth is one of the key transmission parameters used for designing the physical layer of a data transmission system to minimise...

  Full text available to download

• Underwater acoustic communication system using broadband signal with hyperbolically modulated frequency

  Publication

  • J. Schmidt
  • A. Schmidt

  - Vibrations in Physical Systems - Year 2021

  The implementation of reliable acoustic underwater communication in shallow waters is a scientific and engineering challenge, mainly due to the permanent occurrence of the multipath phenomenon. The article presents the concept of a transmission system using a broadband signal with hyperbolically modulated frequency (HFM) to transmit data symbols and synchronize data frames. The simulation tests were carried out in channels with...

  Full text available to download

• Performance of Coherent Modulation Scheme Used in Acoustic Underwater Communication System

  Publication

  • J. Schmidt
  • A. Schmidt
  • I. Kochańska

  - Vibrations in Physical Systems - Year 2019

  The development of an acoustic underwater communication system for shallow waters is still a big scientificand construction challenge. Currently, non-coherent modulations in combination with strong channel coding are used to achieve reliable communication with low rate in such a channel. To obtain transmission with a higher transmission rate, it is required to use coherent modulation. This paper presents the assumptions of such...

  Full text available to download

• Solution of the dike-break problem using finite volume method and splitting technique

  Publication

  • D. Gąsiorowski

  - TASK Quarterly - Year 2011

  In the paper the finite volume method (FVM) is presented for the solution of two-dimensional shallow water equations. These equations are frequently used to simulate the dam-break and dike-break induced flows. The applied numerical algorithm of FVM is based on the wave-propagation algorithm which ensures a stable solution and simultaneously minimizes the numerical errors. The dimensional decomposition according to the coordinate...

  Full text available to download

• Computational analysis of substituent effects on proton affinity and gas-phase basicity of TEMPO derivatives and their hydrogen bonding interactions with water molecules

  Publication

  • A. Shiroudi
  • M. Śmiechowski
  • J. Czub
  • M. A. Abdel-Rahman

  - Scientific Reports - Year 2024

  The study investigates the molecular structure of 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) and its derivatives in the gas phase using B3LYP and M06-2X functional methods. Intermolecular interactions are analyzed using natural bond orbital (NBO) and atoms in molecules (AIM) techniques. NO2-substituted TEMPO displays high reactivity, less stability, and softer properties. The study reveals that the stability of TEMPO derivatives...

  Full text available to download

• Optical microsc. images of wear marks on ball (JPG). Reciprocating siding friction tests. Ball-on-flat contact. Sintered alumina ceramics (98%). Lubricant - DISTILLED WATER. Specim. set K07

  Open Research Data

  open access

  • J. Łubiński
  • K. Druet

  - series: Wear in reciprocating siding friction tests. Ball-on-flat contact. Sintered alumina ceramics (98%).

  Optical microscope images of wear zone on the 5mm diam. ceramic ball used in tests as the fixed specimen.Friction and wear tests in ball-on-flat contact. Both specimens made of sintered alumina ceramics (98%) - self-mated contact.Linear reciprocating motion.Lubrication: DISTILLED WATER. Sliding velocity (peak): 0.1 m/s. Load (normal force): 5N. Test...

• Optical microsc. images of wear marks on ball (JPG). Reciprocating siding friction tests. Ball-on-flat contact. Sintered alumina ceramics (98%). Lubricant - DISTILLED WATER. Specim. set K06

  Open Research Data

  open access

  • J. Łubiński
  • K. Druet

  - series: Wear in reciprocating siding friction tests. Ball-on-flat contact. Sintered alumina ceramics (98%).

  Optical microscope images of wear zone on the 5mm diam. ceramic ball used in tests as the fixed specimen.Friction and wear tests in ball-on-flat contact. Both specimens made of sintered alumina ceramics (98%) - self-mated contact.Linear reciprocating motion.Lubrication: DISTILLED WATER. Sliding velocity (peak): 0.1 m/s. Load (normal force): 5N. Test...

• Optical microsc. images of wear marks on ball (JPG). Reciprocating siding friction tests. Ball-on-flat contact. Sintered alumina ceramics (98%). Lubricant - DISTILLED WATER. Specim. set K02

  Open Research Data

  open access

  • J. Łubiński
  • K. Druet

  - series: Wear in reciprocating siding friction tests. Ball-on-flat contact. Sintered alumina ceramics (98%).

  Optical microscope images of wear zone on the 5mm diam. ceramic ball used in tests as the fixed specimen.Friction and wear tests in ball-on-flat contact. Both specimens made of sintered alumina ceramics (98%) - self-mated contact.Linear reciprocating motion.Lubrication: DISTILLED WATER. Sliding velocity (peak): 0.1 m/s. Load (normal force): 5N. Test...

• Optical microsc. images of wear marks on ball (JPG). Reciprocating siding friction tests. Ball-on-flat contact. Sintered alumina ceramics (98%). Lubricant - DISTILLED WATER. Specim. set K06

  Open Research Data

  open access

  • J. Łubiński
  • K. Druet

  - series: Wear in reciprocating siding friction tests. Ball-on-flat contact. Sintered alumina ceramics (98%).

  Optical microscope images of wear zone on the 5mm diam. ceramic ball used in tests as the fixed specimen.Friction and wear tests in ball-on-flat contact. Both specimens made of sintered alumina ceramics (98%) - self-mated contact.Linear reciprocating motion.Lubrication: DISTILLED WATER. Sliding velocity (peak): 0.1 m/s. Load (normal force): 5N. Test...

• Diver Observations by Means of Acoustic Methods

  Publication

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

  - ACTA PHYSICA POLONICA A - Year 2013

  Searching for objects, especially small ones, moving under water near its the free surface, is always not an easy task. Designing tools for the detection of such targets is a real challenge when the possibility of a terrorist attack is a real threat. This paper presents some aspects of diver detection by means of acoustics methods, both active (side scan sonar) and passive ones (linear receiving antenna). This approach is quite...

  Full text available to download

• Spatial Analysis of Water Infrastructure Development On Example of Eastern Europe Rural Regions

  Publication

  • K. Pietrucha-Urbanik
  • J. Stecko
  • A. Pękala

  - IOP Conference Series: Earth and Environmental Science - Year 2016

  Full text to download in external service

• Chemometric exploration of sea water chemical component data sets with missing elements

  Publication

  • A. Smoliński
  • L. Falkowska
  • D. Pryputniewicz
  • D. Pryputniewicz-Flis

  - OCEANOLOGICAL AND HYDROBIOLOGICAL STUDIES - Year 2008

  Full text to download in external service

• The calculation long-term physical field created by water flow around the ship

  Publication

  • J. Bielański

  - HYDROACOUSTICS - Year 2010

  The paper presents a description of the problems with fluid flow around a ship. Using the described solution of the problem were performed numerical calculations using the boundary element method. Were also presented preliminary results of the calculation of pressure fields at the bottom of the ship, taking into account the impact of the bottom.

  Full text available to download

• Multistatic sonar for man-made lakes and water-power plants antiterrroristic protection

  Publication

  • J. Marszal
  • R. Salamon

  - Year 2010

  Artykuł opisuje nową koncepcję dopplerowskiego sonaru multistatycznego opracowanego w Katedrze Systemów Elektroniki Morskiej Politechniki Gdańskiej. System składa się z sieci hydrofonów rozmieszczonych równomiernie w obserwowanym akwenie oraz ze źródła dźwięku w postaci fali ciągłej o stałej częstotliwości i bardzo niskim natężeniu. Dzięki zastosowaniu specjalnie opracowanych algorytmów przetwarzania sygnałów uzyskuje się poprawną...

• Influence of dissolved organic matter in natural and simulated water on the photochemical decomposition of butylparaben

  Publication

  • M. Gmurek
  • M. Olak-Kucharczyk
  • S. Ledakowicz

  - Journal of Environmental Health Science and Engineering - Year 2015

  Full text to download in external service

• Exploring Solanum tuberosum Epoxide Hydrolase Internal Architecture by Water Molecules Tracking

  Publication

  • K. Mitusińska
  • T. Magdziarz
  • M. Bzówka
  • A. Stańczak
  • A. Gora

  - Biomolecules - Year 2018

  Full text to download in external service

• Ionic liquids for the passive sampling of sulfonamides from water—applicability and selectivity study

  Publication

  • H. Męczykowska
  • P. Kobylis
  • P. Stepnowski
  • M. Caban

  - ANALYTICAL AND BIOANALYTICAL CHEMISTRY - Year 2017

  Full text to download in external service

• Salinity and pH as factors affecting the passive sampling and extraction of pharmaceuticals from water

  Publication

  • H. Lis
  • P. Stepnowski
  • M. Caban

  - Journal of Separation Science - Year 2019

  Full text to download in external service

• Investigation of the distribution of imidazolium ionic liquids in the environment - aggregation in water and sorption on minerals

  Publication

  • J. Łuczak
  • M. Markiewicz
  • M. Joskowska
  • Z. Lustig
  • J. Hupka
  • C. Jungnickel

  - Year 2011

  Wpływ cieczy jonowych na środowisko, a w szczególności: migracja do wód powierzchniowych i gruntowych, jak również transport/retencja w gruntach jest determinowany przede wszystkim przez właściwości fizykochemiczne cieczy jonowej jak i właściwości matrycy środowiskowej. Znajomość zjawisk zachodzących w wyniku kontaktu cieczy jonowych z wodą oraz glebą jest jednym z podstawowych warunków oceny ryzyka chemicznego. W pracy wykazano,...

• Size-dependent effects of ZnO nanoparticles on the photocatalytic degradation of phenol in a water solution

  Publication

  • E. Kusiak-Nejman
  • J. Wojnarowicz
  • A. Morawski
  • U. Narkiewicz
  • K. Sobczak
  • S. Gierlotka
  • W. Lojkowski
  • J. Wojnarowicz

  - Applied Surface Science - Year 2021

  Full text to download in external service

• Static and dynamic superheated water extraction of essential oil components fromThymus vulgarisL.

  Publication

  • A. Dawidowicz
  • E. Rado
  • D. WIANOWSKA

  - Journal of Separation Science - Year 2009

  Full text to download in external service

• The method of multispectral image processing of phytoplankton processing for environmental control of water pollution

  Publication

  • V. Petruk
  • S. Kvaternyuk
  • V. Yasynska
  • A. Kozachuk
  • A. Kotyra
  • R. Romaniuk
  • N. Askarova
  • R. S. Romaniuk

  - Year 2015

  Full text to download in external service

• Chemometric estimation of natural water and sediment using toxicity tests and physicochemical parameters

  Publication

  • A. Kuczyńska
  • L. Wolska
  • V. Simeonov
  • S. Tsakovski
  • S. Zahov
  • J. Namieśnik

  - Journal of Balkan Ecology - Year 2006

  Oceny jakości wód dokonano na podstawie analizy chemometrycznej bazy danych monitoringowych, składającej się z wyników testów toksyczności i wyników badań parametrów fizykochemicznych. Badaniom poddano próbki wód powierzchniowych pobrane z Jeziora Turawskiego oraz próbki wód podziemnych pobranych z otworów badawczych wykonanych w jego dnie, jak i wokół niego. Zastosowano następujące metody chemometryczne: analizę wiązkową i analizę...

  Full text to download in external service

• Complexation of amino acids derivatives in water by calix[4]arene phosphonic acids

  Publication

  • J. Dziemidowicz
  • D. Witt
  • J. Rachoń

  - Journal of Inclusion Phenomena and Macrocyclic Chemistry - Year 2008

  Series of the calix[4]arene phosphonic acids with various substituents at the lower rim was synthesized. Complexing properties of these receptors towards methyl esters of six amino acids strongly depended on the calix[4]arene conformation flexibility. The complex formation processes were monitored using 1H NMR spectroscopy (deuterated phosphate buffer at pD 7.3, 22 oC) and association constant values were evaluated. Inherently...

  Full text to download in external service

• Environmentally friedly propeller shaft support with the use of water lubricated foil bearings

  Publication

  • P. Hryniewicz
  • A. Olszewski
  • M. Wodtke
  • J. Łubiński

  - POLISH JOURNAL OF ENVIRONMENTAL STUDIES - Year 2009

  W pracy przedstawiono podsumowanie prowadzonych badań w celu opracowania oryginalnej metodyki projektowania oraz technologii wykonania pierwszego w świecie łożyska foliowego smarowanego wodą. Zaprezentowano koncepcje nowego łożyska foliowego poprzecznego oraz opisano opracowany algorytm obliczeniowy wykorzystany do predykcji jego charakterystyk. W rezultacie prowadzonych prac opracowano i przebadano doświadczalnie na stanowisku...

• Removal of organic compounds from water by solvent sublation. Criteria for solvent selection.

  Publication

  • S. Pastewski
  • K. Mędrzycka

  - POLISH JOURNAL OF ENVIRONMENTAL STUDIES - Year 2009

  Proces flotoekstrakcji zastosowano do usuwania z wody następujących związków organicznych: tetrachlorku węgla, chloroformu, 1,3,5-trimetylobenzenu (mezytylenu), fenolu i 2,4,5-trichlorofenolu. Jako odbierające fazy organiczne użyto: olej mineralny, 1-dekanol, 1-oktanol, octan amylu, dodekan i tetradekan. Mechanizmem decydującym o usuwaniu lotnych związków organicznych (VOC) było odparowanie do wnętrza pęcherzyków gazu, podczas...

• Recent advances in visible light-driven water oxidation and reduction in suspension systems

  Publication

  • D. Kong
  • Y. Zheng
  • M. Kobielusz
  • Y. Wang
  • Z. Bai
  • W. Macyk
  • X. Wang
  • J. Tang

  - Materials Today - Year 2018

  Full text to download in external service

• Application of Landsat 8 imagery to regional-scale assessment of lake water quality

  Publication

  • J. Andrzej
  • A. Wochna
  • I. Bubak
  • W. Grzybowski
  • K. Lukawska-Matuszewska
  • M. Łącka
  • S. Śliwińska
  • B. Wojtasiewicz
  • M. Zajączkowski
  • K. Łukawska-Matuszewska

  - International Journal of Applied Earth Observation and Geoinformation - Year 2016

  Full text to download in external service

• Properties of the Langmuir and Langmuir–Blodgett monolayers of cholesterol-cyclosporine A on water and polymer support

  Publication

  • K. Przykaza
  • K. Woźniak
  • M. Jurak
  • A. Wiącek
  • R. Mroczka

  - ADSORPTION-JOURNAL OF THE INTERNATIONAL ADSORPTION SOCIETY - Year 2019

  Full text to download in external service

• Legislative and criminal law aspects of water protection and prevention of pharmaceuticals accumulation in nature

  Publication

  • V. Vambol
  • A. Shulha
  • S. Vambol
  • P. Sihag
  • V. Pavlykivskyi
  • N. Mozaffari
  • N. Mozaffari
  • N. Khan
  • B. Sawicka

  - Year 2021

  Full text to download in external service

• Zeta potential, effective diameter and multimodal size distribution in oil/water emulsion

  Publication

  • A. Wiącek
  • E. Chibowski

  - Colloids and Surfaces A: Physicochemical and Engineering Aspects - Year 1999

  Full text to download in external service

• 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.

• Experimental research on effectiveness of the magnetic fluid seals for rotary shafts working in water

  Publication

  • L. Matuszewski
  • Z. Szydło

  - Polish Maritime Research - Year 2007

  Uszczelnianie wałów obrotowych, łożysk i innych zespołów mechanicznych, za pomocą cieczy magnetycznej, tworzącej przegrodę uszczelniającą utrzymywaną siłami pola magnetycznego jest techniką uszczelniania, stosowaną z powodzeniem w urządzeniach pracujących w środowisku gazowym przy ciśnieniu do około 1,0 MPa. Uszczelnienia te umożliwiają również skuteczne rozwiązywanie problemu szczelności przepustów stałych i ruchowych w urządzeniach...

  Full text available to download

• The ice phenomena dynamics of small anthropogenic water bodies in the Silesian Upland, Poland

  Publication

  • M. Solarski

  - Environmental & Socio-economic Studies - Year 2017

  Full text to download in external service

• Increased water content in bacterial cellulose synthesized under rotating magnetic fields

  Publication

  • K. Fijałkowski
  • A. Żywicka
  • R. Drozd
  • A. Junka
  • D. Peitler
  • M. Kordas
  • M. Konopacki
  • P. Szymczyk
  • R. Rakoczy

  - ELECTROMAGNETIC BIOLOGY AND MEDICINE - Year 2017

  Full text to download in external service

• Method for Determination of Methyl tert-Butyl Ether and Its Degradation Products in Water

  Publication

  • C. Church
  • L. Isabelle
  • J. Pankow
  • D. Rose
  • P. Tratnyek
  • M. Kaykhaii

  - ENVIRONMENTAL SCIENCE & TECHNOLOGY - Year 1997

  Full text to download in external service

• Determination of aliphatic amines in water by gas chromatography using headspace solvent microextraction

  Publication

  • M. KAYKHAII
  • S. NAZARI
  • M. CHAMSAZ
  • M. Kaykhaii

  - Talanta - Year 2005

  Full text to download in external service

• A theoretical probe into the effects of material and operational variables on water purification with zeolite membranes

  Publication

  • S. Mousavi
  • A. Mashhadzadeh
  • S. Habibzadeh
  • M. Munir
  • E. Lima
  • M. Saeb
  • S. S. Mousavi Khadem

  - Microporous and Mesoporous Materials - Year 2021

  Full text to download in external service

• Higher harmonics of converter currents in energy conversion system of small water plants

  Publication

  • T. Sobczyk
  • W. Mazgaj
  • Z. Szular
  • T. Wegiel

  - Year 2011

  Full text to download in external service

• Photocatalytic water disinfection under the artificial solar light by fructose-modified TiO2

  Publication

  • P. Rokicka-Konieczna
  • A. B. Markowska-Szczupak
  • E. Kusiak-Nejman
  • A. Morawski

  - Chemical Engineering Journal - Year 2019

  Full text to download in external service

• The application of polypropylene membranes for production of fresh water from brines by membrane distillation

  Publication

  • M. M. Gryta

  - Chemical Papers - Year 2017

  Full text to download in external service

• Studies on membrane scaling during water desalination by direct contact membrane distillation

  Publication

  • M. Tomaszewska
  • M. M. Gryta

  - Year 2017

  Full text to download in external service

• Photocatalytic Water Disinfection under Solar Irradiation by d-Glucose-Modified Titania

  Publication

  • A. B. Markowska-Szczupak
  • P. Rokicka
  • K. Wang
  • M. Endo
  • A. Morawski
  • E. Kowalska

  - Catalysts - Year 2018

  Full text to download in external service

• The influence of magnetic water treatment on CaCO3 scale formation in membrane distillation process

  Publication

  • M. M. Gryta

  - SEPARATION AND PURIFICATION TECHNOLOGY - Year 2011

  Full text to download in external service