Search results for: laser treatment

Praca przedstawia badania względnej odporności kawitacyjnej we wstępnym okresie niszczenia laserowo przetopionej 6 kW laserem CO2 stali C45. Badania odporności kawitacyjnej wykonano na stanowisku z wirującą tarczą. Na erodowanej przetopionej warstwie powierzchniowej określono trzy obszary o różnej intensywności oddziaływania obciążeń kawitacyjnych. Określano wielkość odkształceń plastycznych w analizowanych obszarach, spowodowanych...

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High resolution optical time-domain reflectometry using sub-picosecond laser sources

Publication

- Year 2005

Przedstawiono działanie sensorów światłowodowych wykorzystujących reflektometrię optyczną w dziedzinie czasu. Omówiono ograniczenia możliwości pomiarowych tej klasy sensorów wynikające z zastosowania w nich reflektometrów światłowodowych zaprojektowanych do zastosowań w telekomunikacji. Zaprezentowano sensory wykorzystujące specjalizowane reflektometry o dużej rozdzielczości. Przedstawiono koncepcję sensora wykorzystującego dwa...

Kinetics of molecular decomposition under irradiation of gold nanoparticles with nanosecond laser pulses—A 5-Bromouracil case study

Publication

T. S. Marques
R. Schürmann
K. Ebel
C. Heck
M. Śmiałek-Telega
S. Eden
N. J. Mason
I. Bald

- JOURNAL OF CHEMICAL PHYSICS - Year 2020

ABSTRACT Laser illuminated gold nanoparticles (AuNPs) efficiently absorb light and heat up the surrounding medium, leading to versatile applications ranging from plasmonic catalysis to cancer photothermal therapy. Therefore, an in-depth understanding of the thermal, optical, and electron induced reaction pathways is required. Here, the electrophilic DNA nucleobase analog 5-Bromouracil (BrU) has been used as a model compound to...

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PARAMETERS OF THE ELECTROPHORETIC DEPOSITION PROCESS AND ITS INFLUENCE ON THE MORPHOLOGY OF HYDROXYAPATITE COATINGS. REVIEW

Publication

- Inżynieria Materiałowa - Year 2020

Metallic materials intended for bone implants should exhibit not only appropriate mechanical properties, but also high biocompatibility. The surface treatment modifications, for example acidic treatment, laser treatment, ion implantation and deposition of highly biocompatible coatings, are practiced. One of the most popular methods of surface modification is to deposit hydroxyapatite (HAp) coatings. HAp naturally occurs in human...

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Influence of Nitriding and Laser Remelting on Properties of Austenitic Stainless Steel Type X10CrNi18-8 and Cavitation Erosion Resistance

Publication

A. Sitko
M. Szkodo
S. Kucharski

- Advances in Materials Science - Year 2016

The paper presents properties of surface layers. Surface layers were obtained by using low temperature glow–discharge nitriding process and laser remelting carried out on austenitic stainless steel type X10CrNi18-8. Investigations were done by using an Ultra Nanoindentation Tester (UNHT) in the Warsaw Institute of Fundamental Technological Research. The influence of the above mentioned...

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Examination method of the effect of the incidence angle of laser beam on distance measurement accuracy to surfaces with different colour and roughness

Publication

- Boletim de Ciencias Geodesicas - Year 2016

Interest in the influence of the incidence angle of a laser beam to distance measurements can be seen in many areas of science and technology: geodesy, glaciology, archaeology, machine automation, and others. This paper presents results of measurements of the effect of the incidence angle of a laser beam to distance measurements to the surfaces of different colour and roughness by Topcon's electro-optical total station with an...

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Tuning the Laser-Induced Processing of 3D Porous Graphenic Nanostructures by Boron-Doped Diamond Particles for Flexible Microsupercapacitors

Publication

- ADVANCED FUNCTIONAL MATERIALS - Year 2022

Carbon (sp3)-on-carbon (sp2) materials have the potential to revolutionize fields such as energy storage and microelectronics. However, the rational engineering and printing of carbon-on-carbon materials on flexible substrates remains a challenge in wearable electronics technology. This study demon-strates the scalable fabrication of flexible laser-induced graphene (LIG)-boron doped diamond nanowall (BDNW) hybrid nanostructures...

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Rubrene Thin Films with Viably Enhanced Charge Transport Fabricated by Cryo-Matrix-Assisted Laser Evaporation

Publication

R. Jendrzejewski
N. Majewska
S. Majumdar
S. Mirosław
J. Ryl
G. Śliwiński

- Materials - Year 2021

Among organic semiconductors, rubrene (RB; C42H28) is of rapidly growing interest for the development of organic and hybrid electronics due to exceptionally long spin diffusion length and carrier mobility up to 20 cm2V−1s−1 in single crystals. However, the fabrication of RB thin films resembling properties of the bulk remains challenging, mainly because of the RB molecule’s twisted conformation. This hinders the formation of orthorhombic...

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ROYAL CHAPEL IN GDANSK. STUDY OF FACILITY INVENTORY WITH THE USAGE OF LASER SCANNING WITHIN THE FRAMES OF STUDENT PROJECT

Publication

- Year 2014

This article presents the photogrammetric works carried out during the architectural inventory of the Royal Chapel in the Main Town of Gdansk (Poland). The facility has the status of a monument of architecture and since decades it is covered by geodetic monitoring, realized with the participation of the Department of Geodesy of Faculty of Civil and Environmental Engineering of Gdańsk University of Technology . For several years,...

Pulsed Laser Deposition of Bismuth Vanadate Thin Films—The Effect of Oxygen Pressure on the Morphology, Composition, and Photoelectrochemical Performance

Publication

K. Trzciński
M. Szkoda
M. Gazda
J. Karczewski
A. Cenian
G. Grigorian
M. Sawczak

- Materials - Year 2020

Thin layers of bismuth vanadate were deposited using the pulsed laser deposition technique on commercially available FTO (fluorine-doped tin oxide) substrates. Films were sputtered from a sintered, monoclinic BiVO4 pellet, acting as the target, under various oxygen pressures (from 0.1 to 2 mbar), while the laser beam was perpendicular to the target surface and parallel to the FTO substrate. The oxygen pressure strongly affects...

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Experimental Evaluation of ND: YAG Laser Parameters and Sample Preparation Methods for Texturing Thin AISI 316L Steel Samples

Publication

- Applied Sciences-Basel - Year 2023

In mechanical and material engineering, the effect of laser texturing depends on many factors besides device specification, primarily the properties of the materials being processed, and, secondly, the preparation of the sample. Laser texturing of thin (<5 mm) samples is mostly performed utilizing short-pulse lasers, but depending on the power of the laser beam, the process can also be performed by using continuous operation lasers....

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The Laser Processing of the Stainless-Steel Surface Layer of a Heat Exchanger Membrane in Order to Enhance Its Heat Transfer Coefficient

Publication

- Coatings - Year 2025

Research on temperature regulation is essential for ensuring thermal comfort and optimizing machine performance. Effective cooling systems are critical in industrial processes and everyday electronic devices in order to prevent overheating. Laser-modified heat exchangers can enhance heat dissipation without increasing weight, addressing the need for energy-efficient solutions in the market. The main aim of this experimental research...

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Influence of the notch rounding radius on estimating the elastic notch stress concentration factor in a laser welded tee joint

Publication

- Year 2012

In recent years an increased interest of industry in sandwich-type metal structures can be observed. These structures consist of thin plates of 2.5 mm in thickness separated by stiffeners of different shapes and forms. Welds joining the plates and stiffeners are made on the outer side of the plates using laser welding technique. A locally focused source of heat causes the plate to melt creating a very narrow and elongated joint....

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Application of Msplit method for filtering airborne laser scanning data sets to estimate digital terrain models

Publication

W. Blaszczak-Bak
A. Janowski
W. Kamiński
J. Rapiński

- INTERNATIONAL JOURNAL OF REMOTE SENSING - Year 2015

ALS point cloud filtering involves the separation of observations representing the physical terrain surface from those representing terrain details. A digital terrain model (DTM) is created from a subset of points representing the ground surface. The accuracy of the generated DTM is influenced by several factors, including the survey method used, the accuracy of the source data, the applied DTM generation algorithm, and the survey...

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Controlling crystallites orientation and facet exposure for enhanced electrochemical properties of polycrystalline MoO3 films

Publication

K. Trzciński
Z. Zarach
M. Szkoda
A. Nowak
K. Berent
M. Sawczak

- Scientific Reports - Year 2023

This study focuses on the development and optimization of MoO3 films on commercially available FTO substrates using the pulsed laser deposition (PLD) technique. By carefully selecting deposition conditions and implementing post-treatment procedures, precise control over crystallite orientation relative to the substrate is achieved. Deposition at 450 °C in O2 atmosphere results in random crystallite arrangement, while introducing...

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The Effect of Laser Re-Solidification on Microstructure and Photo-Electrochemical Properties of Fe-Decorated TiO2 Nanotubes

Publication

P. Kupracz
K. Grochowska
J. Karczewski
J. Wawrzyniak
K. Siuzdak

- Materials - Year 2020

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The determination of deformations and stresses of laser welds used for fatigue assessment of steel sandwich panel joints

Publication

K. Niklas

- Year 2010

Panele typu sandwich znajdują szerokie zastosowanie w wielu gałęziach przemysłu. W przypadku niektórych zastosowań wymagających ocenę ryzyka dużą rolę odgrywa ocena trwałości zmęczeniowej spoin laserowych paneli. W pracy prezentowane są metody wyznaczania lokalnych odkształceń i naprężeń w połączeniach spawanych w celu oceny trwałości zmęczeniowej według hipotez lokalnych naprężeń i odkształceń.

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The use of terrestrial laser scanning in monitoring and analyses of erosion phenomena in natural and anthropogenically transformed areas

Publication

P. Dąbek
C. Patrzałek
B. Ćmielewski
R. Żmuda

- Cogent Geoscience - Year 2018

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Alternative Local Melting-Solidification of Suspended Nanoparticles for Heterostructure Formation Enabled by Pulsed Laser Irradiation

Publication

M. Perzanowski

- ADVANCED FUNCTIONAL MATERIALS - Year 2023

Formation of surface layer in metal matrix composite A359/20SiCP during laser assisted turning

Publication

D. Przestacki
P. Szymanski
S. Wojciechowski

- COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING - Year 2016

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Photoconductivity and laser operated piezoelectricity the Ag-Ga-Ge-(S,Se) crystals and solid solutions

Publication

A. El-Naggar
A. Albassam
G. Myronchuk
O. Zamuruyeva
I. Kityk
P. Rakus
O. Parasyuk
J. Jędryka
V. Pavlyuk
M. Piasecki

- MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING - Year 2018

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Laser beam angular stabilization system based on a compact interferometer and a precise double-wedge deflector

Publication

K. Tyszka
M. Dobosz

- REVIEW OF SCIENTIFIC INSTRUMENTS - Year 2018

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Suitability of Laser Engineered Net Shaping Technology for Inconel 625 Based Parts Repair Process

Publication

I. Barwinska
M. Kopec
M. Łazińska
A. Brodecki
T. Durejko
Z. Kowalewski

- Materials - Year 2021

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Scuffing and rolling contact fatigue resistance of discrete laser spot hardened austempered ductile iron

Publication

A. Zammit
S. Abela
J. Betts
R. Michalczewski
M. Kalbarczyk
M. Grech

- WEAR - Year 2019

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On the Microstructure, Microhardnessand Wear Behavior of Gray Cast Iron Surface Layer after Laser Strengthening

Publication

E. Feldshtein
O. Devojno
S. Wojciechowski
M. Kardapolava
I. Kasiakova

- Materials - Year 2022

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Application scanning laser measurements and wavlet transform for dmagae detection in composite wind turbine blade

Publication

- Year 2008

W pracy przedstawiono wyniki pomiarów postaci drgań własnych kompozytowej łopaty turbiny wiatrowej. Przedstawiono wyniki detekcji uszkodzeń oparte o analize falkową zmierzonych form drgań.

Cavitation erosion behavior of 18/8 stainless steel after its laser alloying of manganese

Publication

M. Szkodo

- Year 2005

W pracy przedstawiono badania kawitacyjne stali austenitycznej 18/8 po laserowym stopowaniu jej powierzchni różną zawartością manganu. Oceniano podatnoś stopowanej powierzchni do odkształceniowego umacniania pod wpływem obciążeń kawitacyjnych oraz głębokość umocnienia.

Cavitation erosion behavior of 18/8 stainless steel after its laser alloying of manganese

Publication

M. Szkodo

- Year 2006

W pracy przedstawiono wyniki badań własności kawitacyjnych stali nierdzewnej gatunku 18/8 po jej laserowym stopowaniu różną zawartością manganu. Stwierdzono, że przy zawartości Mn w ilości 7,13% występuje największy wzrost twardości po stopowaniu a głębokość umacniania na skutek działania obciążeń kawitacyjnych jest najmniejsza.

Effect of hybrid modification by ceramic layer formation in MAO process and laser remelting on the structure of titanium bio-alloy Ti13Nb13Zr

Publication

- CERAMICS INTERNATIONAL - Year 2023

To improve the biological properties of titanium alloy Ti13Nb13Zr, hybrid modifications involving micro-arc oxidation (MAO) and Nd: YAG laser remelting were carried out in two combinations. The first consisted of laser modification before the production of the ceramic layer by the micro-arc oxidation process, and the second combination involved Nd: YAG laser modification after the MAO process. The creation of developed surface...

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Integration of Multi-Source Geospatial Data from GNSS Receivers, Terrestrial Laser Scanners, and Unmanned Aerial Vehicles

Publication

P. Dąbrowski
C. Specht
M. Specht
P. Burdziakowski
A. Makar
O. Lewicka

- CANADIAN JOURNAL OF REMOTE SENSING - Year 2021

The analysis based on geospatial data from different measurement systems now constitutes a complex numerical and practical enterprise. The dynamic development of modern technologies enables rapid and precise acquisition of such data. Nonetheless, the diversity of reference systems is today one of the main challenges for their correct interpretation. The combined use of the processed measurement results and archival data in paper...

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Wpływ azotowania jarzeniowego i laserowego nadtapiania na odporność kawitacyjną stali X5CrNi18-10

Publication

A. Sitko

- Year 2013

Nierdzewne stale austenityczne charakteryzują się doskonałą odpornością korozyjną, aczkolwiek niskimi właściwościami mechanicznymi. W wielu przypadkach ogranicza to ich eksploatację w warunkach przemysłowych. Ponadto, nierdzewne stale austenityczne są wrażliwe na korozję lokalną w obecności jonów halogenkowych. Technologie materiałowe, które dają potencjalne możliwości otrzymywania korzystnego wpływu na właściwości mechaniczne...

Processing of point cloud data retrieved from terrestrial laser scanning for structural modeling by Finite Element Method

Publication

P. Ziółkowski

- Year 2017

Finite Element Method is one most popular contemporary method of strength analysis. The method is an advanced method for solving differential equations, based on discretization, which means that area is divided into finite elements. Each finite element has a solution of the equation approximated by specific functions and performing the actual calculations only for nodes of this division. Finite Element Method is widely used in...

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Energy conversion in systems-contained laser irradiated metallic nanoparticles - comparison of results from analytical solutions and numerical methods

Publication

- Acta Mechanica et Automatica - Year 2023

This work introduces the theoretical method of metallic nanoparticles’ (NPs’) heat and mass transfer where the particles are coated on a surface (base), together with considering the case wherein nanoparticles move freely in a pipe. In order to simulate the heat transfer, energy and radiative transfer equations are adjusted to the considered issue. NPs’ properties are determined following the nanofluidic theories, whereas absorption...

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Functional phase bistability in a nanocrystalline RbMn[Fe(CN)6] thin film fabricated by matrix-assisted laser evaporation

Publication

D. Maskowicz
M. Sawczak
R. Jendrzejewski
M. Gazda
H. Tokoro
S. Ohkoshi
Y. Garcia
G. Śliwiński

- SCRIPTA MATERIALIA - Year 2020

One of the main barriers hindering applications of Prussian blue metal assemblies is their poor processability, which makes the fabrication of intact thin films very difficult. In this work, a nanocrystalline RbMn[Fe(CN)6]·xH2O film on silicon substrate was obtained for the first time via laser-stimulated deposition and investigated. Temperature-induced phase transition and bistability within broad hysteresis loop (120 K), along...

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Tin oxide nanoparticles from laser ablation encapsulated in a carbonaceous matrix – a negative electrode in lithium-ion battery applications

Publication

A. Nowak
A. Lisowska-Oleksiak
K. SiuzdaK
M. Sawczak
M. Gazda
J. Karczewski
G. Trykowski

- RSC Advances - Year 2015

This report concerns carbonaceous electrodes doped with tin(II) oxide nanoparticles. Tin nanoparticles are obtained by pulsed laser ablation in water. Crystalline nanoparticles have been encapsulated in a carbonaceous matrix formed after pyrolysis of a mixture consisting of tin/tin(IV) oxide nanoparticles and gelatine. The obtained material is characterized by means of X-ray diffraction, selected area diffraction, scanning electron...

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Femtosecond Er-doped fiber laser source tunable from 872 to 1075 nm for two-photon vision studies in humans

Publication

D. Stachowiak
M. J. Marzejon
J. Bogusławski
Z. Łaszczych
K. Komar
M. Wojtkowski
G. Soboń

- Biomedical Optics Express - Year 2022

We report the development of a widely-tunable femtosecond fiber laser system and its application for two-photon vision studies. The source is based on an Er-doped fiber laser with spectral shift up to 2150 nm, followed by a second harmonic generation module to generate a frequency-doubled beam tunable from 872 to 1075 nm. The source delivers sub-230 fs pulses with nearly-constant duration over the entire tuning range, with output...

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