Wyniki wyszukiwania dla: UNSTEADY SURFACE FLOW

• Liveness measurements using optical flow for biometric person authentication

  Publikacja

  • M. Smiatacz

  - Metrology and Measurement Systems - Rok 2012

  Automatyczne rozpoznawanie twarzy jest jedną z najpopularniejszych technik biometrycznych, jednak nawet najdokładniejsze algorytmy identyfikacji okażą się bezużyteczne, jeśli będzie można je oszukać, np. używając zdjęcia zamiast rzeczywistej osoby. Dlatego też odpowiedni pomiar żywotności jest niezwykle istotny. W pracy zaprezentowano metodę, która jest w stanie rozróżnić pomiędzy sekwencjami wideo pokazującymi żywe osoby oraz...

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• Nonlinear Interaction of Magnetoacoustic Modes in a Quasi-Isentropic Plasma Flow

  Publikacja

  • A. Perelomova

  - Archives of Acoustics - Rok 2021

  The nonlinear interaction of magnetoacoustic waves in a plasma is analytically studied. A plasma is an open system. It is affected by the straight constant equilibrium magnetic flux density forming constant angle with the wave vector which varies from 0 till . The nonlinear instantaneous equation which describes excitation of secondary wave modes in the field of intense magnetoacoustic perturbations is derived by use of projecting....

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• Excitation of Waves in a Dispersive Medium. Example of Flow of a Bubbly Liquid

  Publikacja

  • A. Perelomova

  - ACTA PHYSICA POLONICA A - Rok 2024

  The excitation of wave motion by an external source and the interaction of modes inherent to a ow in a dispersive medium are considered. Dispersion is caused by the presence of gaseous bubbles in a liquid. A large variety of steady excited waveforms is possible when the exciting wave is also steady and propagates at a constant velocity. The velocities of the exciter and forced waves may be dierent. This leads to a variety of non-stationary...

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• The numerical simulation of two-dimensional vertical incompressible viscous flow

  Publikacja

  • P. Zima

  - Rok 2005

  W artykule przedstawiono numeryczne symulacje płaskiego pionowego przepływu nieściśliwej cieczy lepkiej ze swobodną powierzchnią. Zastosowano model bazujący na rozwiązaniu równań Naviera-Stokesa metodą "ciśnień" (SIMPLE). Przy takim podejściu otrzymano dywergencję równań Naviera-Stokesa oraz równanie Poissona na ciśnienie. W rozwiązaniu zastosowano schemat Laxa-Wendroffa z przesuniętą siatką Eulera. Takie podejście zapewnia dokładność...

• The contribution of blood-flow-induced conductivity changes to measured impedance

  Publikacja

  • J. Wtorek
  • A. Poliński

  - Rok 2005

  W pracy rozwazane sa zmiany przewodnosci zachodzace w anizotropowym osrodku i ich wplyw na mierzona rezystancje. Uzyskano to za pomoca rozszerzenia wzoru Geselowizta na przypadki anizotropowe. Wykazano, ze tylko te skladowe zmian przewodnosci wplywaja na mierzona rezystancje, dla ktorych odpowiadajacy im skladnik pola eklektrycznego byl niezerowy.Wyniki te zastosowanu do zmian rezystywnosci wywolanych zmiananmi przewodnosci plynacej...

• Experimental and numerical analysis of streamwise vortex generator for subsonic flow

  Publikacja

  • P. Flaszyński
  • R. Szwaba

  - Chemical and Process Engineering : New Frontiers - Rok 2006

  W pracy przedstawiono porównanie wyników obliczeń numerycznych dwoma kodami (FLUENT i SPARC) na tle badań eksperymentalnych generatora wirów wzdłużnych. Przedstawiono wyniki dla liczb Macha przepływu głównego 0.3 i 0.8. Porównano ciśnienie całkowite w dwóch przekrojach za otworem przez który realizowany jest wydmuch. Przedstawiono strukturę wiru wzdłużnego uzyskaną dla obu programów. Średnica otworu jetu jest równa 1mm, co odpowiada...

• Numerical simulations of granular material flow in silos with and without insert

  Publikacja

  • M. Wójcik
  • J. Tejchman

  - Archives of Civil Engineering - Rok 2007

  Artykuł omawia wyniki naporu materiału sypkiego podczas przepływu w silosach z i bez wkładek. Obliczenia wykonano wykorzystując sformułowanie ale na bazie prawa sprężysto-plastycznego według druckera-pragera. Zbadano wpływ kształtu i położenia wkładki na wielkość naporu i rodzaj przepływu.

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• Experimental and theoretical investigations of silo music during granular flow

  Publikacja

  • K. Wilde
  • M. Rucka
  • J. Tejchman

  - Rok 2008

  Praca dotyczy analizy efektów dynamicznych w silosach podczas przeływu materiałów sypkich.

• Numerical modeling of shear localizations during granular flow in silos.

  Publikacja

  • J. Tejchman

  - Rok 2004

  W artykule przedstawiono wyniki numerycznej analizy MES dotyczącej przepływów materiałów sypkich w silosach. Omówiono różne metody opisu lokalizacji odkształceń stycznych wewnątrz materiałów. Wyniki porónano z wynikami doświadczalnymi.

• Simulations of flow patterns in silos with a cellular automaton - part 2

  Publikacja

  • J. Kozicki
  • J. Tejchman

  - Rok 2005

  W artykule przedstawiono wyniki symulacji przepływów silosowych przy zastosowaniu zaawansowanego aparatu komórkowego, w którym uwzględniono kolizje cząstek i dysypację energii. Obliczenia wykonano dla przepływu masowego i kominowego.

• Experimental and theoretical studies of resonance effects during silo flow.

  Publikacja

  • M. Niedostatkiewicz
  • J. Tejchman

  - Rok 2003

  Przedstawiono badania nad rezonansowymi efektami dynamicznymi podczas przepływów silosowych. Wpływ rezonansu na wielkość naporu był analizowany przy pomocy badań doświadczalnych i obliczeń MES na bazie prawa mikropolarnego sprężysto-plastycznego. Doświadczenia wykonano w silosie o przekroju okrągłym i prostokątnym. Zaproponowano efektywną metodę redukcji efektów dynamicznych.

• Confined granular flow in silos with inserts - full-scale experiments

  Publikacja

  • M. Wójcik
  • J. Tejchman
  • G. G. Enstad

  - POWDER TECHNOLOGY - Rok 2012

  Artykuł omawia wyniki doświadczalne przepływów silosowych w silosach w naturalnej skali ze wstawkami. Podczas doświadczeń pomierzono przemieszczenia oraz napór na ściany. Zastosowano różne typy wstawek położone na różnej wysokości. Wyniki badań doświadczalnych porównano z przepływami bez wstawek.

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• Bacteriological and physicochemical monitoring of inland surface waters within the administrative boundaries of Gdańsk city in 2010

  Dane Badawcze

  open access

  • M. Bartoszewicz

  The dataset containst the results of a bacteriological and physico-chemical study of inland surface waters within the administrative boundaries of Gdańsk city in 2010.The examined material consisted of water samples collected from four lakes located within the administrative boundaries of Gdańsk, Poland.

• Bacteriological and physicochemical monitoring of inland surface waters within the administrative boundaries of Gdańsk City in 2008

  Dane Badawcze

  open access

  • M. Bartoszewicz

  The dataset containst the results of a bacteriological and physico-chemical study of inland surface waters within the administrative boundaries of Gdańsk city in 2008. The examined material consisted of water samples collected from four lakes located within the administrative boundaries of Gdańsk, Poland.

• Bacteriological and physicochemical monitoring of inland surface waters within the administrative boundaries of Gdańsk City in 2009

  Dane Badawcze

  open access

  • M. Bartoszewicz

  The dataset containst the results of a bacteriological and physico-chemical study of inland surface waters within the administrative boundaries of Gdańsk city in 2009. The examined material consisted of water samples collected from four lakes located within the administrative boundaries of Gdańsk, Poland.

• Bacteriological and physicochemical monitoring of inland surface waters within the administrative boundaries of Gdańsk City in 2011

  Dane Badawcze

  open access

  • M. Bartoszewicz

  The dataset containst the results of a bacteriological and physico-chemical study of inland surface waters within the administrative boundaries of Gdańsk city in 2011. The examined material consisted of water samples collected from four lakes located within the administrative boundaries of Gdańsk, Poland.

• Bacteriological and physicochemical monitoring of inland surface waters within the administrative boundaries of Gdańsk city in 2006

  Dane Badawcze

  open access

  • M. Bartoszewicz

  The dataset containst the results of a bacteriological and physico-chemical study of inland surface waters within the administrative boundaries of Gdańsk city in 2006.

• Local response surface approximations and variable-fidelity electromagnetic simulations for computationally efficient microwave design optimisation

  Publikacja

  • S. Kozieł
  • S. Ogurtsov
  • S. Szczepański

  - IET Microwaves Antennas & Propagation - Rok 2012

  In this study, the authors propose a robust and computationally efficient algorithm for simulation-driven design optimisation of microwave structures. Our technique exploits variable-fidelity electromagnetic models of the structure under consideration. The low-fidelity model is optimised using its local response surface approximation surrogates. The high-fidelity model is refined by space mapping with polynomial interpolation of...

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• Examples of numerical simulations of two-dimensional unsaturated flow with VS2DI code using different interblock conductivity averaging schemes

  Publikacja

  • A. Szymkiewicz
  • W. Tisler
  • K. Burzyński

  - GEOLOGOS - Rok 2015

  Flow in unsaturated porous media is commonly described by the Richards equation. This equation is strongly nonlinear due to interrelationships between water pressure head (negative in unsaturated conditions), water content and hydraulic conductivity. The accuracy of numerical solution of the Richards equation often depends on the method used to estimate average hydraulic conductivity between neighboring nodes or cells of the numerical...

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• The phenomenon of increasing capacitance induced by 1T/2H-MoS2 surface modification with Pt particles – Influence on composition and energy storage mechanism

  Publikacja

  • Z. Zarach
  • M. Szkoda
  • K. Trzciński
  • M. S. Łapiński
  • G. Trykowski
  • A. Nowak

  - ELECTROCHIMICA ACTA - Rok 2022

  In this paper, several approaches to the synthesis of molybdenum-based electrode materials for supercapacitors are presented, including anodization, hydrothermal process and annealing. For the material prepared via anodization of a molybdenum plate, followed by a hydrothermal process in thiourea aqueous solution, a thorough study of the Pt-surface modification through repetitive cycling in 1 M sulfuric acid with Pt acting as a...

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• Effect of Surface Treatment of Halloysite Nanotubes (HNTs) on the Kinetics of Epoxy Resin Cure with Amines

  Publikacja

  • V. Akbari
  • M. Jouyandeh
  • S. Paran
  • M. Ganjali
  • H. Abdollahi
  • H. Vahabi
  • Z. Ahmadi
  • K. Formela
  • A. Esmaeili
  • A. Mohaddespour... i 2 innych

  - Polymers - Rok 2020

  The epoxy/clay nanocomposites have been extensively considered over years because of their low cost and excellent performance. Halloysite nanotubes (HNTs) are unique 1D natural nanofillers with a hollow tubular shape and high aspect ratio. To tackle poor dispersion of the pristine halloysite (P-HNT) in the epoxy matrix, alkali surface-treated HNT (A-HNT) and epoxy silane functionalized HNT (F-HNT) were developed and cured with...

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• Improved surface coverage of an optical fibre with nanocrystalline diamond by the application of dip-coating seeding

  Publikacja

  • R. Bogdanowicz
  • M. Sobaszek
  • J. Ryl
  • M. Gnyba
  • M. Ficek
  • Ł. Gołuński
  • W. J. Bock
  • M. Śmietana
  • K. Darowicki

  - DIAMOND AND RELATED MATERIALS - Rok 2015

  Growth processes of diamond thin films on the fused silica optical fibres (10 cm in length) were investigated at various temperatures. Fused silica pre-treatment by dip-coating in a dispersion consisting of detonation nanodiamond (DND) in dimethyl sulfoxide (DMSO) with polyvinyl alcohol (PVA) was applied. Nanocrystalline diamond (NCD) films were deposited on the fibres using the microwave plasma assisted chemical vapour deposition...

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• Seafloor characterisation using multibeam data: sonar image properties, seabed surface properties and echo properties

  Publikacja

  • Z. Łubniewski

  - HYDROACOUSTICS - Rok 2011

  In the paper, the approach to seafloor characterisation is presented. The multibeam sonars, besides their well verified and widely used applications like high resolution bathymetry and underwater object detection and imaging, are also the promising tool in seafloor characterization and classification, having several advantages over conventional single beam echosounders. The proposed approach relies on the combined, concurrent use...

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• Ion Capacity of Siliceous Sorbents with Surface Polymer Layers Composed of Different Dextran—Triethylenetetraamine Mixtures (Ion Capacity of Sorbents with Surface Polymer Layers)

  Publikacja

  • A. Dawidowicz
  • D. WIANOWSKA
  • S. Pikus
  • E. Kobylas
  • S. Radkiewicz

  - ADSORPTION SCIENCE & TECHNOLOGY - Rok 1998

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• Modeling of medium flow processes in transportation pipelines - the synthesis of their state-space models and the analysis of the mathematical properties of the models for leak detection purposes

  Publikacja

  • M. S. Tatara

  - Rok 2019

  The dissertation concerns the issue of modeling the pipeline flow process under incompressible and isothermal conditions, with a target application to the leak detection and isolation systems. First, an introduction to the model-based process diagnostics is provided, where its basic terminology, tools, and methods are described. In the following chapter, a review of the state of the art in the field of leak detection and isolation...

• Influence of silver-core gold-shell nanoparticle parameters on the variation of surface-enhanced Raman spectra

  Publikacja

  • M. Wróbel
  • K. Karpienko
  • M. J. Marzejon
  • F. Sadura
  • S. Siddhanta
  • I. Barman
  • J. Smulko

  - Proceedings of SPIE - Rok 2019

  The detection of molecules by surface-enhanced Raman spectroscopy (SERS) is dependent on the nanomaterial used to induce the enhancement effect. This depends on a variety of parameters of the substrate such as the metal used for their creation, their shape, size and size distribution, concentration, as well as the parameters of the solution, such as packing of the nanoparticles, the complexity of the sample, the solvent, etc. It...

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• Recent advances in electrochemically surface treated titanium and its alloys for biomedical applications: A review of anodic and plasma electrolytic oxidation methods

  Publikacja

  • B. Makurat-Kasprolewicz
  • A. Ossowska

  - Materials Today Communications - Rok 2023

  Nowadays, titanium and its alloys are widely used materials in implantology. Nevertheless, the greatest challenge is still its appropriate surface treatment in order to induce optimal properties, which facilitates formation of a permanent bond between the implant and human tissue. The use of electrochemical treatment such as anodic oxidation or plasma electrolytic oxidation allows for the production of porous coating that mimics...

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• PARTICLE SIZE ANALYSIS OF SUSPENSIONS IN REMOVING OF ORGANIC MATTER AND PHOSPHORUS FROM WASTEWATER AND SURFACE WATER

  Publikacja

  • A. Lang
  • K. Kołecka

  - Architecture Civil Engineering Environment - Rok 2012

  In this paper the particle size of suspended solids in the removing of organic matter and phosphorus compounds from lake water and wastewater treated in the Ecological Treatment Systems (ETS) was analyzed. The invesigated materials were taken from two ETS located in Pomerania Region/Poland. Object in Swarzewo is 3rd stage of biological treatment of municipal wastewater, while object in Kartuzy has task to remove a phosphorus from...

• SURFACE COATINGS INTERNATIONAL PART B-COATINGS TRANSACTIONS

  Czasopisma

  ISSN: 1476-4865

• International Journal of Surface Engineering and Interdisciplinary Materials Science

  Czasopisma

  ISSN: 2166-7225 , eISSN: 2166-7233

• A High-Arctic flow-through lake system hydrochemical changes: Revvatnet, southwestern Svalbard (years 2010–2018)

  Publikacja

  • M. Ruman
  • K. Kosek
  • K. Kozioł
  • M. Ciepły
  • K. Kozak-Dylewska
  • Ż. Polkowska

  - CHEMOSPHERE - Rok 2021

  Lake ecosystems are strongly coupled to features of their surrounding landscapes such as geomorphology, lithology, vegetation and hydrological characteristics. In the 2010–2018 summer seasons, we investigated an Arctic flow-through lake system Revvatnet, located in the vicinity of the coastal zone of Hornsund fjord in Svalbard, characterising its hydrological properties and the chemical composition of its waters. The lake system...

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• Deterministic versus stochastic modelling of unsaturated flow in a sandy field soil based on dual tracer breakthrough data

  Publikacja

  • G. Nützmann
  • S. Maciejewski
  • W. Gorczewska-Langner

  - GEOLOGICAL QUARTERLY - Rok 2022

  The 216 km2 Neuenhagen Millcreeck catchment can be characterized as a drought sensitive landscape in NE Germany. It is therefore a fundamental human interest to understand how water that fell as precipitation moves through the unsaturated soils and recharges groundwater. Additionally, a better knowledge of nutrient transport from soil to groundwater is important also, especially in landscapes with light sandy soils. For a better...

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• Surface water quality assessment by the use of combination of multivariate statistical classification and expert information

  Publikacja

  • M. Tobiszewski
  • S. Tsakovski
  • S. Vasil
  • J. Namieśnik

  - CHEMOSPHERE - Rok 2010

  The present study deals with the assessment of surface water quality from an industrial-urban region located in northern Poland near to the city of Gdansk. Concentrations of thirteen chemicals includingtotal polycyclic aromatic hydrocarbons (PAHs), halogenated volatile organic compounds (HVOCs) and major ions in the samples collected at five sampling points during six campaigns were used as variablesthroughout the study. The originality...

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• Application of unmanned USV surface and AUV underwater maritime platforms for the monitoring of offshore structures at sea

  Publikacja

  • M. K. Gerigk
  • M. Gerigk

  - Zeszyty Naukowe Akademii Morskiej w Szczecinie - Rok 2023

  The operation of offshore structures at sea requires the implementation of advanced systems for their permanent monitoring. There is a set of novel technologies that could be implemented to deliver a higher level of effective and safe operation of these systems. A possible novel solution may be the application of a new maritime unmanned (USV) surface and underwater vehicles/platforms (AUV). Application of such vehicles/platforms...

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• Stability analysis of single-walled carbon nanotubes embedded in winkler foundation placed in a thermal environment considering the surface effect using a new refined beam theory

  Publikacja

  • J. Subrat Kumar
  • S. Chakraverty
  • M. Malikan
  • F. Tornabene

  - MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES - Rok 2021

  This article is devoted to investigate the stability of different types of Single Walled Carbon Nanotubes (SWCNTs) such as zigzag, chiral, and armchair types which are rested in Winkler elastic foundations exposing to both the low and high temperature environments. Also, the Surface effects which include surface energy and surface residual stresses, are taken into consideration in this study. It may be noted that the surface energy...

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• Investigation of abdomen surface deformation due to life excitation: implications for implant selection and orientation in laparoscopic ventral hernia repair

  Publikacja

  • C. K. Szymczak
  • I. Lubowiecka
  • A. Tomaszewska
  • M. Śmietanski

  - CLINICAL BIOMECHANICS - Rok 2012

  Ventral hernia is a common medical problem. Statistically there are around 10% recurrences of the sickness. The authors' former investigation proved edges of the hernia orifice displacements to be one of the factors causing recurrence. Thus, experimental investigation of the abdomen surface deformation due to some normal activities of people is studied.The extreme strains, their localization and directions are identified. The acquired...

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• Poly-L-Lysine-functionalized fluorescent diamond particles: pH triggered fluorescence enhancement via surface charge modulation

  Publikacja

  • M. Janik
  • M. J. Głowacki
  • M. Sawczak
  • A. Wcisło
  • P. Niedziałkowski
  • K. Jurak
  • M. Ficek
  • R. Bogdanowicz

  - MRS BULLETIN - Rok 2022

  Recently, the interest in applying fluorescent diamond particles (FDPs) containing nitrogen-vacancy (NV) centers for enhancing the mechanical and chemical properties of some materials, biological imaging, and sensing has been expanding rapidly. The unique properties of NV centers such as intensive, time-stable fluorescence, and an electron spin, which exhibits long coherence time and may be manipulated using external stimuli, such...

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• Changes on the Surface of the SiO2/C Composite, Leading to the Formation of Conductive Carbon Structures with Complex Nature of DC Conductivity

  Dane Badawcze

  restricted access

  • P. Okoczuk
  • M. Łapiński
  • T. Miruszewski
  • P. Kupracz
  • L. Wicikowski

  Changes on the Surface of the SiO2/C Composite, Leading to the Formation of Conductive Carbon Structures with Complex Nature of DC Conductivity

• Analysis of the Surface Stereometry of Alloyed Austenitic Steel after Fibre Laser Cutting using Confocal Microscopy

  Publikacja

  • S. Krajewski
  • D. Grochała
  • J. Tomków
  • R. Grzejda

  - Coatings - Rok 2023

  The paper extends the concept of cut edge quality and examines the fibre laser cutting process. A Prima Power Platino Fiber Evo device with a reference speed (RS) of 3500 mm/min was used for laser cutting. In order to analyse the influence of the laser cutting speed on the cut edge quality of X5CrNi18-10 stainless steel sheets, macroscopic studies were conducted on a stereoscopic microscope and surface stereometry on a confocal...

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• Fracture Surface Topography Parameters for S235JR Steel Adhesive Joints After Fatigue Shear Testing

  Publikacja

  • A. Kubit
  • W. Macek
  • W. Zielecki
  • P. Szawara
  • M. Kłonica

  - Advances in Science and Technology Research Journal - Rok 2023

  This paper presents the experimental results of a study investigating the effect of holes and notches made on the overlap ends on the strength of adhesive joints. Single-lap joints made of S235JR steel sheets bonded with Araldite 2024-2 epoxy adhesive were tested. For comparative reasons, static shear strength tests and high-cycle fatigue strength tests were performed. Adhesive-filled joints having three holes, each with a diameter...

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• Surface quality of the plasma cermet coatings after grind finishing

  Publikacja

  • E. Zverev
  • V. Skeeba
  • N. Vakhrushev
  • D. Lobanov
  • N. Martyushev

  - IOP Conference Series: Earth and Environmental Science - Rok 2019

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• Preparation and Surface Characterization of Chitosan-Based Coatings for PET Materials

  Publikacja

  • K. Szafran
  • M. Jurak
  • R. Mroczka
  • A. Wiącek

  - MOLECULES - Rok 2023

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• Reductive Photodegradation of 4,4′-Isopropylidenebis(2,6-dibromophenol) on Fe3O4 Surface

  Publikacja

  • J. Kisała
  • B. Vasile
  • A. Ficai
  • D. Ficai
  • R. Wojnarowska-Nowak
  • T. Szreder

  - Materials - Rok 2023

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• Influence of abrasive slurry dosage on flat surface lapping effects

  Publikacja

  • A. Barylski

  - Rok 2006

  Przedstawiono wyniki badań dawkowania zawiesiny ściernej w obróbce powierzchni płaskich na docierarce jednotarczowej. Analizowano wpływ dawki ścierniwa na wydajność i jakość obróbki elementów ceramicznych i miedzianych.

• Low-temperature reactivity of the surface species of vanadia–tungsta catalyst

  Publikacja

  • M. Najbar
  • A. Góra
  • A. Białas
  • A. Wesełucha-Birczyńska

  - SOLID STATE IONICS - Rok 2001

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• Thermal decomposition of surface compounds for the generation of small quantities of acetaldehyde

  Publikacja

  • E. Przyk
  • A. Świtaj-Zawadka
  • P. Konieczka
  • J. Szczygelska-Tao
  • J. Biernat
  • J. Namieśnik

  - Analytica Chimica Acta - Rok 2003

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• Generation of standard gaseous mixtures by thermal decomposition of surface compounds

  Publikacja

  • P. Konieczka
  • J. Namieśnik
  • J. Biernat

  - Journal of Chromatography A - Rok 1991

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• Automated non destructive testing by non-contact surface waves

  Publikacja

  • B. Piwakowski
  • M. Kaczmarek
  • P. Safinowski

  - Rok 2012

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• Evaluation of concrete cover by surface wave technique: Identification procedure

  Publikacja

  • B. Piwakowski
  • M. Kaczmarek
  • P. Safinowski

  - Rok 2012

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• The influence of the temperature treatment on the Nd2-xCexCuO4-y crystals surface

  Publikacja

  • T. Klimczuk
  • W. Sadowski
  • J. Szmytkowski
  • T. Klimczuk

  - VACUUM - Rok 1999

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