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Search results for: LASERY
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Noise in electrical double-layer capacitors (EDLCs)
PublicationWe present methods and problems of noise measurements in electrical double-layer capacitors (EDLC). Detailed noise equivalent electronic circuit is considered, and two possible ways of observations of random processes generated in the EDLCs structures are studied. We conclude that noise is a useful tool for characterization of the EDLC structures and their state-of-health, as in other materials and electronic devices. Eventual,...
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In-vivo monitoring of oxygen saturation in murine carcinoma during PDT by diode laser light diffuse reflectance
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FPGA-based LLRF control module for x-ray free electron laser and TESLA feedback system
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A Systematic and Comparative Study of Binary Metal Catalysts for Carbon Nanotube Fabrication Using CVD and Laser Evaporation
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Introductory investigations of dermatologic diode laser with wavelengths 975 nm: clinical therapy of Recklinghausen disease and of hemangiomas
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Novel Quaternary TlGaSn2Se6 Single Crystal as Promising Material for Laser Operated Infrared Nonlinear Optical Modulators
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Evaluation of Surface Topography after Face Turning of CoCr Alloys Fabricated by Casting and Selective Laser Melting
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CFD COUPLING OF VOF MODEL WITH ARRHENIUS EQUATION FOR ANALYSIS OF LASER-INDUCED THERMAL DEACTIVATION OF E. COLI
PublicationUnderstanding bacterial deactivation at the micro-scale, particularly with E. coli, is crucial for advancing microbiology and has promising applications in biomedical research. In this research contribution, we investigate the thermal inactivation of E. coli bacteria using gold nanoparticles irradiated by a green 1-W laser within a microfluidic chamber. The microfluidic device comprises a fluidic chamber filled with a thin film...
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ROYAL CHAPEL IN GDANSK. STUDY OF FACILITY INVENTORY WITH THE USAGE OF LASER SCANNING WITHIN THE FRAMES OF STUDENT PROJECT
PublicationThis 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,...
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Determinants of the surface quality, density and dimensional correctness in selective laser melting of the Ti-13Zr-13Nb alloy
PublicationSelective laser melting is widely used for custom-designed elements. Successful manufacturing depends on laser treatment parameters and material features. This research aimed to determine the effects of laser power, scan time and hatch distance on surface quality, relative density and dimensional precision for cuboids made of the Ti-13Zr-13Nb alloy. The influence of energy density, energy flux and pre-heating was seen to be decisive...
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Effect of plasma sprayed and laser re-melted Al2O3 coatings on hardness and wear properties of stainless steel
PublicationCommercially available austenic stainless steel substrate was coated with commercially available, raw Al2O3 powder applied by means of plasma spraying method and then re-melted with CO2 laser beam of various parameters. Tribological and mechanical properties of the 120 J/mm and 160 J/mm laser re-melted coatings were compared with the tribological and mechanical properties of the “as-sprayed” coating. The influence of the laser...
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Synthesis, structural characterization, and thermal properties of Ca‐ and La‐doped soda‐lime glasses by laser melting
PublicationLaser melting techniques have been used in the preparation of unconventional glass compositions with high melting temperatures. Thus, we wanted to test the feasibility of using a CO2 laser in the preparation of nitrogen-rich oxynitride glasses and nitride silicate glasses. Melting from oxides and metallic raw materials, we wanted to study first glass formation and possible evaporation losses of the glass components. Two glass series...
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The In-Depth Studies of Pulsed UV Laser-Modified TiO2 Nanotubes: The Influence of Geometry, Crystallinity, and Processing Parameters
PublicationThe laser processing of the titania nanotubes has been investigated in terms of morphology, structure, and optical properties of the obtained material. The length of the nanotubes and crystallinity, as well as the atmosphere of the laser treatment, were taken into account. The degree of changes of the initial geometry of nanotubes were checked by means of scanning electron microscopy, which visualizes both the surface and the cross-section....
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Application of Msplit method for filtering airborne laser scanning data sets to estimate digital terrain models
PublicationALS 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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Laser induced formation of copper species over TiO2 nanotubes towards enhanced water splitting performance
PublicationWe proposed fast and scalable route where the ordered TiO2 nanotubes coated with thin copper layers were annealed by the laser beam of 355 nm wavelength at different fluencies in the range of 15–120 mJ/cm2. As a result, copper species are integrated with the titania substrate and the formed material exhibits unique optical absorption bands in the visible range. Moreover, X-ray photoelectron spectroscopy analysis reveals the formation...
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The pulsed laser ablation synthesis of colloidal iron oxide nanoparticles for the enhancement of TiO2 nanotubes photo-activity
PublicationThe rapid, only a few minutes long synthesis of FeO, Fe3O4, and Fe2O3nanoparticles mixture utilizing the pulsedlaser ablation using simply pure iron target and water was demonstrated. The size and crystal phase of Fe-basedNPs were characterized using DLS and HR-TEM techniques, respectively. The metastable suspension of FeO,Fe3O4, and Fe2O3nanoparticles was used to the decoration of anodized TiO2nanotubes (TiO2-NTs) by means ofthe...
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Anodic titania nanotubes decorated with gold nanoparticles produced by laser-induced dewetting of thin metallic films
PublicationHerein, we combine titania layers with gold species in a laser-supported process and report a substantial change of properties of the resulting heterostructures depending on the major processing parameters. Electrodes were fabricated via an anodisation process complemented with calcination to ensure a crystalline phase, and followed by magnetron sputtering of metallic films. The obtained TiO2 nanotubes with deposited thin (5, 10...
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Analysis of the Surface Stereometry of Alloyed Austenitic Steel after Fibre Laser Cutting using Confocal Microscopy
PublicationThe 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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Rubrene Thin Films with Viably Enhanced Charge Transport Fabricated by Cryo-Matrix-Assisted Laser Evaporation
PublicationAmong 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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Antibacterial properties of laser-encapsulated titanium oxide nanotubes decorated with nanosilver and covered with chitosan/Eudragit polymers
PublicationTo provide antibacterial properties, the titanium samples were subjected to electrochemical oxidation in the fluoride-containing diethylene glycol-based electrolyte to create a titanium oxide nanotubular surface. Afterward, the surface was covered by sputtering with silver 5 nm film, and the tops of the nanotubes were capped using laser treatment, resulting in an appearance of silver nanoparticles (AgNPs) of around 30 nm in diameter...
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Patterned hydrophobic and hydrophilic surfaces of ultra-smooth nanocrystalline diamond layers
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Influence of nitrogen plasma treatment on the wettability of polyetheretherketone and deposited chitosan layers
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Evaluation of Thermal Stresses in Asphalt Layers Incomparison with TSRST Test Results
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Dependence of the charge carries photogeneration yield on the bimolecular recombination in tetracene layers
PublicationBadano mechanizmy generacji nośników ładunku dwóch znaków w warstwie tetracenu. Rezultaty pomiarów doświadczalnych oraz prowadzona analiza wykazały, że rekombinacja wpływa znacząco na produkcję nośników ujemnych.
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ADCP Observations of Diel Vertical Migration of Biological Layers in Gulf of Gdańsk
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Effect of concentration boundary layers on mechanical pressure in a double-membrane system
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implementacja algorytmu stabilizacji obrazu z kamery w układzie FPGA
PublicationW systemach monitorujących ruch uliczny wykorzystywane są algorytmy wstępnego przetwarzania obrazu takie jak: filtracji, kompresji oraz stabilizacji. Algorytmom tym stawiane są następujące wymagania: praca w czasie rzeczywistym, minimalna moc pobierana ze źródła zasilania (systemy zasilane bateryjnie), zajmowanie niewielkich zasobów sprzętowych (układy FPGA czy CPLD) oraz wykonywanie jedynie podstawowych operacji arytmetycznych...
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The Usage of the BP-Layers Stereo Matching Algorithm with the EBCA Camera Set
PublicationThis paper is concerned with applying a stereo matching algorithm called BP-Layers to a set of many cameras. BP Layers is designed for obtaining disparity maps from stereo cameras. The algorithm takes advantage of convolutional natural networks. This paper presents using this algorithm with a set called Equal Baseline Camera Array. This set consists of up to five cameras with one central camera and other ones aground it. Such a...
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Nanotubular Ti Oxide Layers for Enhancement of Bone-Implant Bonding and Bioactivity
PublicationAbstrakt artykułu pt. ''Nanotubular Ti Oxide Layers for Enhancement of Bone-Implant Bonding and Bioactivity''. The paper describes techniques to improve the bioactivity of titanium and ehnahnce the bone-implant bonding ability by the electrochemical anodization to fabricate titania nanotubular oxide layer.
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Properties of surface layers of duplex stainless steel after burnishing processes
PublicationStress corrosion cracking resistance of cold worked layers of 25 Cr duplex stainless steel grade UR52N+ has been investigated. The surface layers were performed through burnishing treatment. The residual stresses at surface layers were determined using grazing angle incidence X-ray diffraction method (g-sin2 Ψ). Corrosion tests were performed with the use of Slow Strain Rate Test technique in boiling 35% MgCl2 solution. It has...
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Thermal Stability of Multicomponent Layers Created with the Hybrid Method on Aluminium Base
PublicationW pracy przedstawiono skład fazowy, mikrostrukturę oraz graficzny i matematyczny opis kinetyki utleniania wieloskładnikowych warstw powierzchniowych wytworzonych na aluminiowym podłożu.
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Deposition, morphology and functional properties of layers based on DLC:Si and DLC:N on polyurethane
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Śledzenie głowy użytkownika komputera z użyciem kamery Time of Flight
PublicationOpisano opracowaną metodę śledzenia położenia głowy użytkownika komputera lub urządzenia mobilnego przy wykorzystaniu kamery mierzącej czas powrotu wiązki promieniowania elektromagnetycznego podczerwonego odbitej od oświetlanego obiektu (ang. Time Of Flight camera). Dzięki zastosowaniu odpowiednich metod cyfrowego przetwarzania obrazu pozyskanego z kamery tego typu możliwe jest zlokalizowanie użytkownika w przestrzeni 3D. Znajomość...
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Nanotubular oxide layers and hydroxyapatite coatings on ‘Ti–13Zr–13Nb’ alloy
PublicationThe presented research was aimed to determine the mechanical properties of the nanotubular oxide layer covered with hydroxyapatite coating. The Ti–13Zr–13Nb alloy was oxidised in 1M phosphoric acid with an addition of 0?5% HF for HF solution at 20 V voltage. The electrochemically assisted deposition of hydroxyapatite was performed at cyclic polarisation in NH4H2PO4 and CaCl2 solution at 80uC. The mechanical properties were determined...
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Creation and characteristics of the (Mn-N-O) surface layers on aluminium alloy
PublicationPrzedstawiono koncepcję tworzenia warstw powierzchniowych zawierających mangan, azot i tlen. Warstwy wykazują twardość powierzchniową 358 HV0,01, zwiększoną odporność na korozję w kwasie siarkowym oraz odporność na zużycie ścierne w skojarzeniu z żeliwem szarym.
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Evaluation of Thermal Stresses in Asphalt Layers in Comparison with TSRST Test Results
PublicationThe paper presents the results of calculations and laboratory determination of thermal stresses at low temperatures. The modified Hills and Brien's method was used to calculate the thermal stresses in asphalt layers of pavements and the results were compared against the values obtained at a laboratory with the Thermal Stress Restrained Specimen Test (TSRST) method. The laboratory investigations were conducted using plain grade...
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Interface layers between electrolyte and cathodes for solid oxide fuel cells
PublicationW pracy przebadano możliwość zastosowania warstwy CGO ((CeO2)0.8 (Gd2O3)0.1) w tlenkowych ogniwach paliwowych. Do wytworzenia warstwy użyto pirolizy aerozolowej.
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Oxide layers fabricated by spray pyrolysis for resistance random access memory
PublicationW pracy zbadano przydatność pirolizy aerozolowej do wytwarzania warstw dla memrystorów.
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Seeding enhancement for microcrystaline diamond layers growth on non-diamond substrates
PublicationThe present paper gives an overview on the possible methods of seeding substrates for diamond layers growth. Diamond in reason of his properties is very desirable material in microelectronic, biomedical and waste treatment sensors. Microcrystalline diamond for these applications must be grown on silicon substrate in microwave plasma assisted chemical vapor deposition (MPACVD). To grow diamond on non-diamond surface pre-growth...
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Nanotubular Titanium Oxide Layers for Enhancement of Bone-Implant Bonding and Bioactivity
PublicationThe present paper describes the techniques to improve the bioactivity of titanium and enhance the bone-implant bonding ability by the electrochemical anodization to fabricate titania nanotube arrays (TiO2).
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Thermal boundary conditions to simulate friction layers and coatings at sliding contacts
PublicationA brief review of the thermal boundary conditions specified at sliding interfaces was performed. New thermal boundary conditions were derived aimed at solving problems of sliding with account of surface layers representing friction layers and tribological coatings. Based on the assumption of linear temperature distributions in the surface layers, the proposed conditions enable one to simplify simulations by eliminating the surface...
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Nanotubular oxide layers and hydroxyapatite coatings on porous titanium alloy Ti13Nb13Zr
PublicationThe surface condition of an implant has a significant impact on response occurring at the implant-biosystem border. The knowledge of physical-chemical and biological processes allows for targeted modification of biomaterials to induce a specified response of a tissue. The present research was aimed at development of technology composing of obtaining the nanotube oxide layers on a porous titanium alloy Ti13Nb13Zr, followed by the...
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Acid–base properties of the crosslinked polysaccharide–polyimine layer deposited on the surface of siliceous material (acid–base properties of the polysaccharide–polyimine layer)
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Sol–gel glasses with enhanced luminescence of laser dye Rhodamine B due to plasmonic coupling by copper nanoparticles
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<title>Cavity control system advanced modeling and simulations for TESLA linear accelerator and free electron laser</title>
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Monolithically p-down nitride laser diodes and LEDs obtained by MBE using buried tunnel junction design
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Kinetics of molecular decomposition under irradiation of gold nanoparticles with nanosecond laser pulses—A 5-Bromouracil case study
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Integration of Multi-Source Geospatial Data from GNSS Receivers, Terrestrial Laser Scanners, and Unmanned Aerial Vehicles
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Giant increase of optical transparency for Zn-rich CaxZn1−xO on Al2O3 (0001) grown by pulsed laser deposition
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Influence of Nitriding and Laser Remelting on Properties of Austenitic Stainless Steel Type X10CrNi18-8 and Cavitation Erosion Resistance
PublicationThe 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...