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Wyniki wyszukiwania dla: laboratoryjny material odniesienia
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Validation of lumbar spine finite element model
Dane BadawczeThe functional biomechanics of the lumbar spine have been better understood by finite element method (FEM) simulations. However, there are still areas where the behavior of soft tissues can be better modeled or described in a different way. The purpose of this research is to develop and validate a lumbar spine section intended for biomechanical research....
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Strong ellipticity within the Toupin–Mindlin first strain gradient elasticity theory
PublikacjaWe discuss the strong ellipticity (SE) condition within the Toupin–Mindlin first strain gradient elasticity theory. SE condition is closely related to certain material instabilities and describes mathematical properties of corresponding boundary-value problems. For isotropic solids, SE condition transforms into two inequalities in terms of five gradient-elastic moduli.
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MnCo2O4 deposited by spray pyrolysis as a protective layer for stainless steel interconects
PublikacjaStainless steel interconnects working in Solid Oxide Fuel Cells stacks are exposed to high temperature resulting in their corrosion. Protective layers for the hydrogen and oxygen sides are necessary to protect the interconnect material, prolongate the stack lifetime and maintain the output power. In this paper MnCo2O4 protective layer for the oxygen side of the interconnect is deposited by spray pyrolysis and is examined.
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Load Testing of GFRP Composite U-Shape Footbridge
PublikacjaThe paper presents the scope of load tests carried out on an innovative shell composite footbridge. The tested footbridge was manufactured in one production cycle and has no components made from materials other than GFRP laminates and PET foam. The load tests, performed on a 14-m long structure, were the final stage of a research program in the Fobridge project carried out in cooperation with: Gdańsk University of Technology (leader),...
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Maximum forces in tendon connections for an anchor without pin in the single-side sample experiment
Dane BadawczeThe main objective of the all study was to assess the load capacity of a new implant device for knotless tendon anastomosis. During this series of experiments the load capacity of the anchoring element without a pin (see figure 1) was examined. Tendons from fresh swine legs (commercially available) served as the biological material. All samples were...
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Maximum forces in tendon connections for an anchor with pin in the single-side sample experiment
Dane BadawczeThe main objective of the all study was to assess the load capacity of a new implant device for knotless tendon anastomosis. During this series of experiments the load capacity of the anchoring element with a pin (see figure 1) was examined. Tendons from fresh swine legs (commercially available) served as the biological material. All samples were subjected...
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3D intact knee model used in analysis of the medial meniscus biomechanics in the osteoarthritic knee joint - input text file for computation
Dane BadawczeThe finite element method was used to simulate the stance phase of the gait cycle. An intact knee model with original geometry and material parametetrs was prepared based on magnetic resonance scans of the left knee joint of a healthy volunteer. The file was created in Abaqus 6.14-2, but can be read in a text editor.
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Maximum forces in tendon connections for the Kessler suture in the single-side sample experiment
Dane BadawczeThe main objective of the all study was to assess the load capacity of a new implant device for knotless tendon anastomosis. During this series of experiments the load capacity of the traditional two-strand Kessler sutures (3-0 sutures) was examined. Tendons from fresh swine legs (commercially available) served as the biological material. All samples...
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The XRD diffraction patterns of (La0.3Sr0.6Ce0.1)0.9Me0.1Ti0.9O3-δ (Me= Co, Cu, Fe, Mn, Ni) materials after reduction at 900 deg.C in hydrogen
Dane BadawczeThe (La0.3Sr0.6Ce0.1)0.9Me0.1Ti0.9O3-δ (Me= Co, Cu, Fe, Mn, Ni) materials were synthesized via the solid state reaction method and examined as a potential anode material. First, the mixed oxide reagents were pressed into pellets and calcined at 1200 °C for 12 hours to decompose most of the organic compounds. The resulting calcined pellet was ground...
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Broadband dielectric spectroscopy studies of multiple times processed poly(lactic acid)-carbon black composites
Dane BadawczeThis dataset contains broadband dielectric spectroscopy studies of commercially available ProtoPasta 3D printable filament, composed of poly-lactic acid (PLA) and conductive carbon black (CB) filler. The aim of the study is to observe structural differences and applied properties changes under multiple reprocessing of the composite material at different...
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The XRD diffraction patterns of (La0.3Sr0.6Ce0.1)0.9Me0.1Ti0.9O3-δ (Me= Co, Cu, Fe, Mn, Ni) materials after reduction at 1000 deg.C in hydrogen
Dane BadawczeThe (La0.3Sr0.6Ce0.1)0.9Me0.1Ti0.9O3-δ (Me= Co, Cu, Fe, Mn, Ni) materials were synthesized via the solid state reaction method and examined as a potential anode material. First, the mixed oxide reagents were pressed into pellets and calcined at 1200 °C for 12 hours to decompose most of the organic compounds. The resulting calcined pellet was ground...
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The XRD diffraction patterns of (La0.3Sr0.6Ce0.1)0.9Me0.1Ti0.9O3-δ (Me= Co, Cu, Fe, Mn, Ni) materials after reduction at 1100 deg.C in hydrogen
Dane BadawczeThe (La0.3Sr0.6Ce0.1)0.9Me0.1Ti0.9O3-δ (Me= Co, Cu, Fe, Mn, Ni) materials were synthesized via the solid state reaction method and examined as a potential anode material. First, the mixed oxide reagents were pressed into pellets and calcined at 1200 °C for 12 hours to decompose most of the organic compounds. The resulting calcined pellet was ground...
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Topography studies of multiple times processed poly(lactic acid)-carbon black composites
Dane BadawczeThis dataset contains topography studies with scanning electron microscope of commercially available ProtoPasta 3D printable filament, composed of poly-lactic acid (PLA) and conductive carbon black (CB) filler. The aim of the study is to observe structural differences and applied properties changes under multiple reprocessing of the composite material...
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Electrochemical analyses of multiple times processed poly(lactic acid)-carbon black composites
Dane BadawczeThis dataset contains cyclic voltammetry studies of commercially available ProtoPasta 3D printable filament, composed of poly-lactic acid (PLA) and conductive carbon black (CB) filler. The aim of the study is to observe structural differences and applied properties changes under multiple reprocessing of the composite material at different temperatures...
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Thermal analyses of multiple times processed poly(lactic acid)-carbon black composites
Dane BadawczeThis dataset contains thermal analyses (TGA, DTG, DSC) studies of commercially available ProtoPasta 3D printable filament, composed of poly-lactic acid (PLA) and conductive carbon black (CB) filler. The aim of the study is to observe structural differences and applied properties changes under multiple reprocessing of the composite material at different...
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Mocz ludzki jako źródło informacji na temat narażenia człowieka na różnorodne czynniki chemiczne
PublikacjaMocz - jest to wydzielina wytwarzana przez nerki w ilości ok. 1500 ml na dobę; płyn zawierający oprócz wody (95%) szkodliwe i zbędne produkty przemiany materii. Mocz jest materiałem biologicznym niezwykle bogatym w niezbędne informacje na temat funkcjonowania organizmu człowieka i efektów narażenia na szkodliwe substancje pochodzące z otaczającego środowiska. Ze względu na swoje właściwości, prosty sposób pobierania próbki, który...
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Porównania międzylaboratoryjne w praktyce
PublikacjaJednym z najistotniejszych środków służących do potwierdzenia miarodajności wyników analiz uzyski-wanych przez laboratoria analityczne oraz do monitorowania uzyskiwanych wyników pomiarów anali-tycznych jest udział w różnego typu badaniach międzylaboratoryjnych.Podstawowym, problemem badań międzylaboratoryjnych jest zarówno odpowiednie ich przygotowanie przez organizatora badań jak i przeprowadzenie pomiarów przez ich uczestników....
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Projekt i implementacja rejestratora OBD do rejestracji wielkości dla potrzeb badania infrastruktury drogowej
PublikacjaOpisany w artykule rejestrator OBD jest cyfrowym urządzeniem elektronicznym, które może w czasie rzeczywistym gromadzić dane związane z pojazdem i przechowywać je w celu późniejszego przetwarzania dla celów badawczych. Urządzenie takie może posłużyć do analizy przejazdu pod względem dynamiki ruchu, ekonomii jazdy, a nawet pomóc w zapobieganiu wypadkom samochodowym i ograniczać ich skutki [4][5]. W artykule opisano proces opracowania...
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Modelowanie rozwoju regionalnej sieci połączeń kolejowych z wykorzystaniem metody analitycznego procesu sieciowego
PublikacjaW artykule przedstawiono wielokryterialny model decyzyjny dla kategoryzacji linii kolejowych w województwie pomorskim z uwagi wymogi użyteczności publicznej. Punktem odniesienia dla analizy był Plan zrównoważonego rozwoju publicznego transportu zbiorowego w województwie pomorskim, w którym z uwagi na niezbędną elastyczność decyzyjną nie dokonano parametryzacji kryteriów decydujących o przypisaniu linii do segmentu użyteczności...
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Automatyzacja procesu obliczeń efektywności różnych termodynamicznych wariantów pracy układów ORC
PublikacjaArtykuł poświęcony jest opisowi możliwości automatyzacji podstawowych obliczeń w procesie projektowania instalacji na bazie układów ORC. Już na etapie początkowym projektu niezbędne jest prawidłowe oszacowanie możliwości związanych z parametrami źródła dostępnej energii oraz dokonanie wyboru odpowiednich wariantów pracy układów. Każdorazowe wykonywanie schematycznego procesu obliczeń w stosunku do każdego spośród dużej ilości potencjalnych,...
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Opcje towarowe jako instrumenty dywersyfikacji ryzyka zmiany cen na rynkach rolnych
PublikacjaInstrumenty pochodne odgrywają kluczowa rolę w odkrywaniu cen na rynkach rolnych przy jednoczesnym zapewnieniu skutecznego zarządzania ryzykiem cen. Producenci i pośrednicy na rynkach rolnych zabezpieczają ryzyko zmian cen. To zachęca do zwiększenia produktywności w sektorze rolnym, ponieważ producenci rolni i przetwórcy masowych produktów rolnych są w stanie skoncentrować swoje wysiłki na zarządzaniu ryzykiem produkcji. Są to...
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Murale - przekształcenie architektury budynków na przykładzie gdańskiego osiedla Zaspa - Młyniec
PublikacjaMalarstwo monumentalne, określane w tym artykule jako mural, towarzyszy człowiekowi nieprzerwanie w kolejnych etapach cywilizacyjnego rozwoju. Jego różne formy pojawiały się na ścianach jaskiń i budowlach reprezentujących systemy władzy czy kultu religijnego – określały i wciąż określają sferę sacrum i profanum. Trudno jednoznacznie powiedzieć czym są, używając dzisiejszej terminologii street artu, graffiti i muralu, naskalne malowidła...
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QUEUE I
WydarzeniaFaculty of Applied Physics and Mathematics of Gdańsk Tech invites international students to the next summer school - Quantum and Molecules I (QUEUE I), organized within the ScienceApp project.
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Impact of blending with polystyrene on the microstructural and electrochemical properties of SiOC ceramic
PublikacjaIn this work, we present the electrochemical behavior and microstructural analysis of silicon oxycarbide (SiOC) ceramics influenced by an addition of polystyrene (PS). Polymer-derived ceramics were obtained by pyrolysis (1000°C, Ar atmosphere) of different polysiloxanes prepared by sol–gel synthesis. This method is very effective to obtain desired composition of final ceramic. Two alkoxysilanes phenylthriethoxysilane and diphenyldimethoxysilane...
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High temperature proton conduction in LaSbO4
PublikacjaLanthanum orthoantimonate was synthesized using a solid‐state synthesis method. To enhance the possible protonic conductivity, samples with the addition of 1 mol% Ca in La‐site, were also prepared. The structure was studied by the means of X‐ray diffraction, which showed that both specimens were single phase. The materials crystallized in the space group P2 1 /n. Dilatometry revealed that material expands non‐linearly with the...
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Studying the Effect of Working Conditions on WEDM Machining Performance of Super Alloy Inconel 617
PublikacjaWire electrical discharge machining (WEDM) has been for many years a precise and efficient non-conventional manufacturing solution in various industrial applications, mostly involving the use of hard-to machine materials like, among other, the Inconel super alloys. The focus of the present study is on exploring the effect of selected control parameters, including pulse duration, pulse-off time and the dielectric flow pressure on...
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Palm Oil Fuel Ash-Based Eco-Efficient Concrete: A Critical Review of the Short-Term Properties
PublikacjaThe huge demand for concrete is predicted to upsurge due to rapid construction developments. Environmental worries regarding the large amounts of carbon dioxide emanations from cement production have resulted in new ideas to develop supplemental cementing materials, aiming to decrease the cement volume required for making concrete. Palm-oil-fuel-ash (POFA) is an industrial byproduct derived from palm oil waste’s incineration in...
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Effectiveness of various types of coating materials applied in reinforced concrete exposed to freeze–thaw cycles and chlorides
PublikacjaThis study assesses the durability of coated and uncoated concrete surfaces protected with four different coating materials: water-soluble (BW), solvent-based (BR), mineral (MI), and epoxy (EP). The durability assessment includes evaluating the absorption rate of water, pull-off adhesion strength, and coating material thickness. Concrete samples were subjected to immersion in regular water and a 7% urea solution, followed by...
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Experimental and theoretical study on high-temperature creep of VT6 titanium alloy under multi-axial loading conditions
PublikacjaIn the framework of damage mechanics, we discuss a new mathematical model that describes the kinetics of the stress–strain state and damage accumulation during material degradation by the mechanism of long-term strength under complex multiaxial stress state. An experimental and theoretical technique is proposed for determination of material parameters and scalar constitutive functions for damaged media based on specially set experiments...
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Effectiveness of various types of coating materials applied in reinforced concrete exposed to freeze–thaw cycles and chlorides
PublikacjaThis study assesses the durability of coated and uncoated concrete surfaces protected with four Different coating materials: water-soluble (BW), solvent-based (BR), mineral (MI), and epoxy (EP). The durability assessment includes evaluating the absorption rate of water, pull-of adhesion strength, and coating material thickness. Concrete samples were subjected to immersion in regular water and a 7% urea solution, followed by cyclic...
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Digestate Quality Originating from Kitchen Waste
PublikacjaThis paper examines the influence of biomass directed to anaerobic digestion on the quality of digestate, specifically focusing on the presence of undesirable substances, such as plastics, including biodegradable ones. It analyses the susceptibility of selected bioplastics to degradation and addresses the problem of reliable identification of microplastics in both feedstock—directed to anaerobic digestion—and produced digestate....
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Properties of LiMnBO3 glasses and nanostructured glass-ceramics
PublikacjaPolycrystalline LiMnBO3 is a promising cathode material for Li-ion batteries. In this work, we investigated the thermal, structural and electrical properties of glassy and nanocrystallized materials having the same chemical composition. The original glass was obtained via a standard melt-quenching method. SEM and 7Li solid-state NMR indicate that it contains a mixture of two distinct glassy phases. The results suggest that the...
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Damaged plasticity model - seismic analysis of structure of the Petronas Twin Towers (Kuala Lumpur) in Malaysia
PublikacjaThe article presents numerical simulations for the modelling of seismic impact on the structure of Petronas Twin Towers (Kuala Lumpur) in Malaysia with application of two methods. The Response Spectrum method, in which a spectrum of the structure's responses to an earthquake's impact is generated and the Acceletogram (BETA) method, in which we generate dynamic load in the form of a diagram of the connection between acceleration...
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Numerical Modelling of Connections Between Stones in Foundations of Historical Buildings
PublikacjaThe aim of this paper is to analyse the behaviour of old building foundations composed of stones (the main load-bearing elements) and mortar, based on numerical analysis. Some basic aspects of historical foundations are briefly discussed, with an emphasis on their development, techniques, and material. The behaviour of a foundation subjected to the loads transmitted from the upper parts of the structure is described...
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Sea bottom structure investigation by means of acoustic methods
PublikacjaThe main aim of the paper is the result of experimental investigations of the seabed in the Gulf of Gdańsk arried out using parametric echosounder as a main measuring tool. Examination of the surface's upper layer of the seabed, especially is acoustic properties, reflecting most often transsmision and reflection properties of the incident elastic wave, could be a valuable material for determination of the stratification, and the...
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Centrally Pivoted Tilting Pad Thrust Bearing with Carbon-Based Coated Collar—Experimental Results of Low- and Medium-Speed Operation
PublikacjaExperimental results of the research on a tilting pad thrust bearing with symmetrical pad support in the conditions of high loads and low speeds are presented in the paper. As described in the literature review, experimental results of tilting pad bearings at low speed/high load regime and transient conditions are rare. Unusual material selection - steel pad against a DLC-type coating on the collar was utilized. Such material combination...
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Synthesis and structural properties of (Y, Sr)(Ti, Fe, Nb)O3−δ perovskite nanoparticles fabricated by modified polymer precursor method
PublikacjaThe yttrium, iron and niobium doped-SrTiO3 powders have been successfully fabricated by a modified low–temperature synthesis method from a polymer complex. The usage of strontium hydroxide precursor instead of conventional strontium nitrate or strontium carbonate provides to the possibility of significant decrease of annealing temperature. It allows to prepare a material with sphere-shape grains of nanometric size (15–70 nm). The...
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Development of potential candidate reference materials for drugs in bottom sediment, cod and herring tissues
PublikacjaRegular use of a reference material and participation in a proficiency testing program can improve the reliability of analytical data. This paper presents the preparation of candidate reference materials for the drugs metoprolol, propranolol, carbamazepine, naproxen, and acenocoumarol in freshwater bottom sediment and cod and herring tissues. These reference materials are not available commercially. Drugs (between 7 ng/g and 32...
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Effects of FSW Tool Plunge Depth on Properties of an Al-Mg-Si Alloy T-Joint: Thermomechanical Modeling and Experimental Evaluation
PublikacjaOne of the main challenging issues in friction stir welding (FSW) of stiffened structures is maximizing skin and flange mixing. Among the various parameters in FSW that can affect the quality of mixing between skin and flange is tool plunge depth (TPD). In this research, the effects of TPD during FSW of an Al-Mg-Si alloy T-joint are investigated. The computational fluid dynamics (CFD) method can help understand TPD effects on FSW...
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Mechanical and Corrosion Properties of Laser Surface-Treated Ti13Nb13Zr Alloy with MWCNTs Coatings
Publikacja: Titanium and its alloys is the main group of materials used in prosthetics and implantology. Despite their popularity and many advantages associated with their biocompatibility, these materials have a few significant disadvantages. These include low biologic activity—which reduces the growth of fibrous tissue and allows loosening of the prosthesis—the possibility of metallosis and related inflammation or other allergic reactions,...
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Ecological bearing systems for water turbines – research and development at Gdansk University of Technology
PublikacjaIncreasing requirements for environmental protection make it necessary to introduce new materials and designs. Hydroelectric power plants operating in direct contact with water reservoirs and rivers are potentially endangering water cleanliness, hence they should also be modernized in the way minimizing the environmental hazards. A lot of progress in this field has been achieved in last decades, but still there is much work to...
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Surface modifications of ti and its alloys
PublikacjaThis article reviews the various surface modification techniques pertaining to titanium and titanium alloys including physical treatment, mechanical treatment, and chemical and electrochemical treatment. The proper surface modification expands the use of titanium and its alloys in the biomedical field for long-term implants retaining the excellent properties of substrate material and improving the specific surface properties required...
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Comparison of buckling resistance of columns modelled by beam and shell elements using non-linear analysis
PublikacjaThe aim of the paper is to investigate the stability process in the axially compressed columns modelled by beam and shell elements using static and dynamic finite element analysis by taking both the geometric and material non-linearity into account. The perfect columns and columns with geometric imperfections were analysed. The differences between the results of static and dynamic analyses in shell and beam models were discussed.
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Membrane model of human abdominal wall. Simulations vs. in vivo measurements
PublikacjaThe study presents a methodology of defining a numerical model of human abdominal wall based on the experimentally registered data of the abdomen geometry due to variations of the intraabdominal pressure. The abdominal wall is modelled here as a simple homogeneous membrane structure made of linear orthotropic material The displacements registered during the increase of pressure are compared with the re-sults of the model static...
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New technologies using Trace Metals of Concern
PublikacjaThis chapter discusses the occurrence, material flows, technical applications of and pollution by platinum, palladium, thallium, rare earth elements, gold , silver, and antimony, all of which are essential for global economic growth. Modern technology relies on theses chemicals for the production of various industrial goods. however, their use releases pollutants into the environment, thus posing a threat to human health.
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Chemically Selective Alternatives to Photoferroelectrics for Polarization-Enhanced Photocatalysis: The Untapped Potential of Hybrid Inorganic Nanotubes
PublikacjaLinear-scaling density functional theory simulation of methylated imogolite nanotubes (NTs) elucidates the interplay between wall-polarization, bands separation, charge-transfer excitation, and tunable electrostatics inside and outside the NT-cavity. The results suggest that integration of polarization-enhanced selective photocatalysis and chemical separation into one overall dipole-free material should be possible.
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Przegląd nanododatków stosowanych w warstwach asfaltowych nawierzchni drogowych
PublikacjaJednym z kierunków rozwoju technologii materiałowych jest nanotechnologia rozumiana jako dziedzina zajmująca się zastosowaniem nanododatków do wytwarzania nowych materiałów oraz ich wpływem na parametry modyfikowanych materiałów. W ostatnich latach nanotechnologia wkracza do technologii modyfikacji asfaltów stosowanych w nawierzchniach drogowych. W artykule przedstawiono stosowane obecnie w budownictwie drogowym nanododatki oraz...
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Koncert zespołu Apteka w Kwadratowej
WydarzeniaZapraszamy na koncert legendarnego trójmiejskiego zespołu APTEKA. Zespół ma w swoim dorobku setki koncertów, nagrody oraz wyróżnienia prestiżowych periodyków muzycznych.
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Rheology studies of multiple times processed poly(lactic acid)-carbon black composites
Dane BadawczeThis dataset contains MFR/MVR (melt flow rate) rheology studies of commercially available ProtoPasta 3D printable filament, composed of poly-lactic acid (PLA) and conductive carbon black (CB) filler. The study aims to observe structural differences and applied properties changes under multiple reprocessing of the composite material at different temperatures...
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Optical properties of TeOx gels doped with a mix of rare-earth ions
Dane BadawczeThe DataSet contains the UV-Vis spectra of the TeOx gels doped with a mix of rare-earth ions. The material was obtained by the sol-gel method. The starting solution was prepared by mixing telluric acid (precursor) with thetraetylene glycol, water, and ethanol. Next, the different molar concentration of rare-earth ions was added, nitrates were used...