Search results for: coastal currents

• Surf Zone Currents in the Coastal Zone of the Southern Baltic Sea – a Modelling Approach

  Publication

  • A. Dudkowska
  • A. Cupiał

  - Year 2022

  Nearshore currents in a multi-bar non-tidal coastal zone environment located in the Southern Baltic Sea are studied. Spatiotemporal seaward-directed jets – so-called rip currents – are an important part of the nearshore current system. In previous research, Dudkowska et al. (2020) performed an extended modelling experiment to determine the wave conditions that are conducive to the emergence of rip currents. In this paper, the...

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• Behavior of residual current devices at earth fault currents with DC component

  Publication

  • S. Czapp
  • H. Tariq
  • S. Cieślik

  - SENSORS - Year 2022

  Low-voltage electrical installations are increasingly saturated with power electronic converters. Due to very high popularity of photovoltaic (PV) installations and the spread of electric vehicles (EV) as well as their charging installations, DC–AC and AC–DC converters are often found in power systems. The transformerless coupling of AC and DC systems via power electronic converters means that an electrical installation containing...

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• COASTAL ENGINEERING

  Journals

  ISSN: 0378-3839 , eISSN: 1872-7379

• Testing sensitivity of A-type residual current devices to earth fault currents with harmonics

  Publication

  • S. Czapp

  - SENSORS - Year 2020

  In many applications, modern current-using equipment utilizes power electronic converters to control the consumed power and to adjust the motor speed. Such equipment is used both in industrial and domestic installations. A characteristic feature of the converters is producing distorted earth fault currents, which contain a wide spectrum of harmonics, including high-order harmonics. Nowadays, protection against electric shock in...

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• Improving sensitivity of residual current transformers to high frequency earth fault currents

  Publication

  • S. Czapp
  • K. Dobrzyński
  • J. Klucznik
  • Z. Lubośny
  • R. Kowalak

  - Archives of Electrical Engineering - Year 2017

  For protection against electric shock in low voltage systems residual current devices are commonly used. However, their proper operation can be interfered when high frequency earth fault current occurs. Serious hazard of electrocution exists then. In order to detect such a current, it is necessary to modify parameters of residual current devices, especially the operating point of their current transformer. The authors proposed...

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• COASTAL MANAGEMENT

  Journals

  ISSN: 0892-0753 , eISSN: 1521-0421

• Modification of the operating point of residual current transformers for high frequency earth fault currents detection

  Publication

  • S. Czapp
  • K. Dobrzyński
  • J. Klucznik
  • Z. Lubośny
  • R. Kowalak

  - Year 2016

  For protection against electric shock in low voltage systems residual current devices are commonly used. However, their proper operation can be interfered when earth fault current with high frequency components occurs. Serious hazard of electrocution exists then. One of the most important element of residual current devices is a residual current transformer with iron core. Tripping characteristic of residual current devices strictly...

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• CRYSTAL GROWTH & DESIGN

  Journals

  ISSN: 1528-7483 , eISSN: 1528-7505

• Estuarine Coastal and Shelf Science

  Journals

  ISSN: 0272-7714 , eISSN: 1096-0015

• MEDIUM-TERM WAVE AND CURRENT MODELLING FOR A MESOTIDAL WADDEN SEA COAST

  Publication

  • A. Herman
  • R. Kaiser
  • H. Niemeyer

  - Year 2007

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• Baltic Coastal Zone

  Journals

  ISSN: 1643-0115

• Marine and Coastal Fisheries

  Journals

  ISSN: 1942-5120

• JOURNAL OF COASTAL CONSERVATION

  Journals

  ISSN: 1400-0350 , eISSN: 1874-7841

• Ocean and Coastal Research

  Journals

  eISSN: 2675-2824

• Coastal cellular distress system

  Publication

  • R. Katulski
  • R. Niski
  • J. Stefański

  - Year 2005

  Przedstawiono koncepcję systemu bezpieczeństwa w morskiej strefie A1, opartego o istniejące sieci komórkowe GSM. System ten został opracowany dla potrzeb małych jednostek pływających (nieinstytucjonalnych), które mają ograniczony dostęp do zasobów systemu GMDSS. Zostały przeprowadzone również badania symulacyjne efektywności lokalizowania terminala ruchomego w warunkach morskich. Otrzymane rezultaty w wybranych warunkach spełniają...

• Importance of benthic macrofauna and coastal biotopes for ecosystem functioning – Oxygen and nutrient fluxes in the coastal zone

  Publication

  • U. Janas
  • D. Burska
  • H. Kendzierska
  • D. Pryputniewicz-Flis
  • K. Łukawska-Matuszewska

  - Estuarine Coastal and Shelf Science - Year 2019

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• JOURNAL OF CRYSTAL GROWTH

  Journals

  ISSN: 0022-0248 , eISSN: 1873-5002

• Implementation of TVDI calculation for coastal zone

  Publication

  • T. Bieliński

  - Year 2015

  Paper will show an implementation of TVDI (Temperature-Vegetation-Dryness Index) algorithm on GPU (Graphics Processing Unit). Calculation of this index is based on LST (Land Surface Temperature) and NDVI (Normalized Difference Vegetation Index). Discussed results are based on multi-spectral imagery retrieved from AVHRR3 sensors for area of Poland, especially from region of Gdańsk coastal zone. All phases of TVDI implementation...

• JOURNAL OF COASTAL RESEARCH

  Journals

  ISSN: 0749-0208 , eISSN: 1551-5036

• Journal of Island & Coastal Archaeology

  Journals

  ISSN: 1556-4894 , eISSN: 1556-1828

• Journal of Ocean and Coastal Economics

  Journals

  eISSN: 2373-8456

• The essence of marine and coastal space – an interdisciplinary perspective

  Publication

  • K. Jerzak
  • M. D. Shrayer
  • K. Krośnicka
  • P. Lorens
  • J. Zaucha
  • J. Pardus

  - EUROPA XXI - Year 2019

  Sea space has been undergoing a profound transformation. Although it retains its inspirational function in arts, literature and philosophy, it has been gaining new anthropogenic dimensions in eco-nomics and urban planning as a source of satisfying human needs i.e. the provision of harmony, beauty, off-shore energy, and biotech substances. Therefore, in this paper marine space is analyzed from a mul-tidimensional perspective of...

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• Seasonal changes of mercury speciation in the coastal sediments

  Publication

  • J. Bełdowski
  • M. Szubska
  • M. Bełdowska
  • K. Jankowska
  • E. Kotlarska
  • B. Graca

  - JOURNAL OF SOILS AND SEDIMENTS - Year 2018

  Purpose Mercury speciation in sediments is linked to environmental conditions and processes. Domination of particular mercury species depends on its source, displays considerable seasonal behavior, and may be further modified due to oxygen levels, icing conditions, or the input of fresh organic matter. The purpose of this study was to examine the coastal area of the Gulf of Gdańsk in terms of mercury contamination and the influence...

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• Accelerator of the entrepreneurship: suburbs in the coastal metropolis of GOM

  Publication

  • J. Martyniuk-Pęczek
  • O. Martyniuk
  • T. Parteka

  - Year 2014

  Polish model of suburban structure is made of variety types of enterprises in different scales, and a range of housing. However this mass of unordered structure with its urban development problems, often leads to the establishment of business and also the development of local entrepreneurship. This article investigates SME sector located in the suburban area of costal metropolis GOM to prove the thesis that the positive effect...

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• CURRENT PSYCHOLOGY

  Journals

  ISSN: 1046-1310 , eISSN: 1936-4733

• CURRENT MEDICINAL CHEMISTRY

  Journals

  ISSN: 0929-8673 , eISSN: 1875-533X

• Analysis of transformer inrush currents

  Publication

  • J. Horiszny

  - Year 2005

  W artykule przedstawiono model i wyniki obliczeń prądu i strumienia magnetycznego w układzie zawierającym transformator trójfazowy i wyłącznik. Opracowano obwodowy model łącznika z łukiem elektrycznym. Model łuku zbudowano w oparciu o jego statyczną i dynamiczną charakterystykę prądowo-napięciową. Przeprowadzone symulacje wykazały, że wartość maksymalna prądu włączania transformatora zależy zarówno od chwili włączenia napięcia...

• Mercury at coastal zone of Puck Bay (southern Baltic)

  Publication

  • M. Bełdowska
  • A. Jedruch
  • J. Bełdowski
  • M. Szubska
  • J. Kobos
  • S. Mudrak
  • B. Graca
  • A. Zgrundo
  • M. Ziółkowska
  • J. Kiełczewska... and 3 others

  - Year 2013

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• A Numerical Model Study on Ice Boom in a Coastal Lake

  Publication

  • T. Kolerski
  • H. T. Shen
  • S. Kioka

  - JOURNAL OF COASTAL RESEARCH - Year 2013

  A numerical study on the effectiveness of the proposed ice boom to be installed near the entrance of Lake Notoro, Hokkaido, Japan to prevent sea ice moving into the lake is presented. A two-dimensional hydro–ice dynamics model was modified to allow for the treatment of ice-boom interaction with the effect of tidal current. The numerical model is a coupled hydrodynamic and ice dynamic model. The ice dynamic component uses a Lagrangian...

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• Reliable underwater communication system for shallow coastal waters

  Publication

  • J. Schmidt

  - HYDROACOUSTICS - Year 2014

  This paper presents a reliable and robust low data rate spread spectrum approach which is implemented in the acoustic underwater communication system for shallow coastal waters. It shows operation assumptions of spread spectrum techniques based on the wellknown Shannon equation. It describes two methods of spread spectrum: frequency hopping spread spectrum and direct sequence spread spectrum; their block diagram and their characteristics...

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• CRYSTAL RESEARCH AND TECHNOLOGY

  Journals

  ISSN: 0232-1300 , eISSN: 1521-4079

• CRYSTAL ENGINEERING

  Journals

  ISSN: 1463-0184

• International Journal of Marine and Coastal Law

  Journals

  ISSN: 0927-3522 , eISSN: 1571-8085

• Journal of Integrated Coastal Zone Management

  Journals

  eISSN: 1646-8872

• Time-current tripping characteristics of RCDs for sinusoidal testing current

  Publication

  • S. Czapp

  - Year 2021

  Low-voltage electrical installations are verified initially – before being put into operation, as well as periodically – during their utilization. According to the IEC standards, the scope of the verification includes measurements of both the tripping current and the disconnection time of residual current devices (RCDs). Experiences in RCDs testing show that disconnection times of two or more similar RCDs can be quite different....

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• Detection of high frequency current components by residual current devices

  Publication

  • S. Czapp
  • K. Dobrzyński
  • J. Klucznik
  • R. Kowalak
  • Z. Lubośny
  • R. Małkowski

  - Year 2014

  The negative impact of current harmonics on the main components of residual current devices is presented. A solution for the improvement of the operation of residual current devices is proposed.

• The effect of current delay angle on tripping of residual current devices

  Publication

  • S. Czapp
  • J. Horiszny

  - Year 2017

  Power electronics converters applied in domestic or similar installations may utilize current delay (phase) angle control to change the level of transferred power. Due to application of such types of converters, earth fault current in the installation may be strongly distorted. The current distortion level depends on a value of current delay angle. This delay angle also influences the tripping threshold of residual current devices....

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• Accumulation of mercury in the macrozoobenthic fauna of the coastal zone of the Gulf of Gdańsk

  Publication

  • A. Jedruch

  - Year 2019

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• Canthaxanthin in recent sediments as an indicator of heterocystous cyanobacteria in coastal waters

  Publication

  • M. Krajewska
  • M. Szymczak-Żyła
  • J. Kobos
  • M. Witak
  • G. Kowalewska

  - OCEANOLOGIA - Year 2019

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• Mercury concentration variability in the zooplankton of the southern Baltic coastal zone

  Publication

  • M. Bełdowska
  • S. Mudrak-Cegiołka

  - PROGRESS IN OCEANOGRAPHY - Year 2017

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• Mercury in Precipitation at an Urbanized Coastal Zone of the Baltic Sea (Poland)

  Publication

  • D. Saniewska
  • M. Bełdowska
  • J. Bełdowski
  • L. Falkowska

  - AMBIO - Year 2014

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• Scour development in front of coastal structures at intermediate phases of construction

  Publication

  • T. Marcinkowski

  - Year 2005

  Publikacja poświęcona jest zagrożeniom budowli morskich spowodowanych powstawaniem form erozyjnych na dnie morskim w sąsiedztwie konstrukcji. Pomiary i obserwacje wykonane w warunkch naturalnych porównane zostały z istniejącymi zaleceniami i wytycznymi do projektowania. Przedstawiono sytuacje, w których zagrożenie rzeczywiste osiągnęło poziom wyższy od zakładanego w fazie projektowej. Przedstawiono również przypuszczalne mechanizmy...

• Actual problems of the polish coastal landscape, architecture and culturalheritage protection

  Publication

  • M. Gawlicki

  - Year 2003

  Praca zawiera ogólną charakterystykę krajobrazu polskiego wybrzeża, przedstawia podstawowe zagrożenia jako wartości wynikające z nieprzemyślanych decyzji planistycznych oraz żywiołowego rozwoju strefy nadmorskiej, prezentuje także walory środowiska kulturowego wsi położonych nad Bałtykiem, ich architekturę oraz aktualne problemy ich ochrony.

• OCEAN & COASTAL MANAGEMENT

  Journals

  ISSN: 0964-5691 , eISSN: 1873-524X

• Journal of the Korean Crystal Growth and Crystal Technology

  Journals

  ISSN: 1225-1429 , eISSN: 2234-5078

• Current divider-based nanosecond high current pulse measuring systems

  Publication

  • M. Nowak
  • K. Jakubiuk
  • D. Kowalak
  • M. Pikoń
  • J. Czucha
  • J. Starzyński

  - MEASUREMENT - Year 2021

  This paper presents the analysis of the new approach to the measurement methodology of significant values (in order of hundreds of kA) and huge steepness (in order of MA/μs) current pulses based on current dividers along with a comparison of the various types transducers suitability in measuring systems with such extreme parameters. Such dividers are used to extend the measurement ranges of current transducers with limited current...

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• The effect of earth fault current harmonics on tripping of residual current devices

  Publication

  • S. Czapp

  - Przegląd Elektrotechniczny - Year 2009

  Szerokie zastosowanie przekształtników, a w szczególności przemienników częstotliwości sprawia, że wyłączniki różnicowoprądowe znajdują się w obwodach, w których może płynąć odkształcony prąd ziemnozwarciowy. Prąd ziemnozwarciowy w obwodach z przemiennikami częstotliwości zawiera harmoniczne, których rząd głównie zależy od częstotliwości PWM. Odkształcony prąd wpływa na poprawne wyzwalanie wyłączników różnicowoprądowych. W artykule...

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• A current-controlled FET

  Publication

  • W. Kordalski

  - Zeszyty Naukowe Wydziału ETI Politechniki Gdańskiej. Technologie Informacyjne - Year 2007

  A novel semiconductor device, viz., Horizontally-Split-Drain Current-Controlled Field-Effect Transistor (HSDCCFET) with two control electrodes is proposed in this works. For the sake of brevity, the device can be called a CCFET. Operating principle of the proposed transistor is based on one of the galvanomagnetic phenomena, the Biot-Savart-Laplace law and a Gradual Channel Detachment Effect (GCDE). The transistor is dedicated...

• Estuaries and Coasts

  Journals

  ISSN: 1559-2723 , eISSN: 1559-2731

• Anthropocene Coasts

  Journals

  eISSN: 2561-4150