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Search results for: MECHANIKA%20P%C4%98KANIA
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Chemical structure, thermal and mechanical characterization of bio-based polyurethane composites filled with microcrystalline cellulose
PublicationOver the past several decades, the interest in replacing the synthetic components used in the production of polymers and composites with their natural counteparts has been growing. Biocomposites belong to the group of materials produced with the use of renewable raw materials. There has been a recent surge of interest in the industrial applications of composites containing natural fibres reinforced with biopolymers. Biopolymers...
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Study of the effect of thermally reduced graphene oxide on the physical and mechanical properties of flexible polyurethane foams
PublicationFlexible polyurethane foams were obtained from a two-component system via the one-step method. The foams were modified with thermally reduced graphene oxide added in the amount equal to 0.25, 0.5 and 0.75 wt%. The morphology, static and dynamic properties, and thermal stability of modified foams were determined. The application of carbon filler resulted in the visible increase in the cell size, apparent density and rigidity of...
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Effect of long term service at elevated temperatures on mechanical properties of Manaurite XM reformer tubes
PublicationMicrostructure transformations occur in the Manaurite XM cast steel tubes during long-term operation in the reformer furnace were revealed and described. The rela tionship between mechanical properties, an increase of internal diameter of the tube and microstructure degradation is discussed. Static tensile test was performed on two types of samples with different shapes. It has been shown differences in the results of tests...
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Mechanical response of human thoracic spine ligaments under quasi-static loading: An experimental study
PublicationPurpose This study aimed to investigate the geometrical and mechanical properties of human thoracic spine ligaments subjected to uniaxial quasi-static tensile test. Methods Four human thoracic spines, obtained through a body donation program, were utilized for the study. The anterior longitudinal ligament (ALL), posterior longitudinal ligament (PLL), capsular ligament (CL), ligamenta flava (LF), and the interspinous ligament and...
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GTR/Thermoplastics Blends: How Do Interfacial Interactions Govern Processing and Physico-Mechanical Properties?
PublicationIn this work, GTR/thermoplastics blends (in ratio 50/50 and 75/25 wt.%) were prepared by melt-compounding in an internal mixer. During research, trans-polyoctenamer rubber (TOR), ethylene-vinyl acetate copolymer (EVA), ethylene-octene copolymer (EOC), and linear low-density polyethylene (LLDPE), were used in their thermoplastic phase. Microstructure and processing-performance property interrelationships of the studied materials...
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Consideration of the safety of bungee jumping in relation to mechanical properties of the instalation based on a jump accident in Gdynia
PublicationThis paper considers a bungee jumping accident that took place in July 2019 in Gdynia, Poland. The authors conducted an investigation to determine the cause of the bungee rope failure. It was based on mechanical tests concerning the strength of the rope as well as the calculation of the force induced in the rope during the jump. Based on the theoretical and experimental results, the rope safety factor was estimated. It appeared...
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Experimental investigations on the mechanical properties and damage detection of carbon nanotubes modified crumb rubber concrete
PublicationThis study presents a modified crumb rubber (MCR) concrete design mix reinforced with multi-walled carbon nanotubes (MWCNTs), mechanical characterization, and cracking monitoring using the acoustic emission (AE) technique. The results showed that the bridging effect of MWCNTs and MCR in the concrete mix mitigated the shortcomings of MWCNT-MCR concrete and improved the flexural and compressive strengths by 18.3% and 26.5%, respectively,...
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Mechanical Properties of Twisted Carbon Nanotube Bundles with Carbon Linkers from Molecular Dynamics Simulations
PublicationThe manufacturing of high-modulus, high-strength fibers is of paramount importance for real-world, high-end applications. In this respect, carbon nanotubes represent the ideal candidates for realizing such fibers. However, their remarkable mechanical performance is difficult to bring up to the macroscale, due to the low load transfer within the fiber. A strategy to increase such load transfer is the introduction of chemical linkers...
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The effect of Sr and Mg substitutions on structure, mechanical properties and solubility of fluorapatite ceramics for biomedical applications
PublicationIonic substitutions play important role in the modifications of biological apatites. Recently, attention has been focused on the co-doping effects on the functional properties of apatite-based biomaterials. In this research work, the dense samples of fluorapatites, Ca10(PO4)6F2 and Ca8MgSr(PO4)6F2, were produced after sintering at 1250 °C for 6 h in air. Structural characterization carried out with XRD, IR, Raman and SEM, confirmed...
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High-density Polyethylene - Expanded Perlite Composites: Structural Oriented Analysis of Mechanical and Thermomechanical Properties
PublicationAs part of this work, research was carried out on the effect of the addition of expanded perlite (PR) on the mechanical and thermomechanical properties of high-density polyethylene (PE) composites. Composites containing from 1 to 10 wt% of the inorganic filler were produced. Polyethylene-based composites manufactured by twin-screw extrusion and formed in the compression molding process were subjected to mechanical, thermomechanical,...
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Physicochemical and Mechanical Performance of Freestanding Boron-Doped Diamond Nanosheets Coated with C:H:N:O Plasma Polymer
PublicationThe physicochemical and mechanical properties of thin and freestanding heavy boron-doped diamond (BDD) nanosheets coated with a thin C:H:N:O plasma polymer were studied. First, diamond nanosheets were grown and doped with boron on a Ta substrate using the microwave plasma-enhanced chemical vapor deposition technique (MPECVD). Next, the BDD/Ta samples were covered with nylon 6.6 to improve their stability in harsh environments and...
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On description of periodic magnetosonic perturbations in a quasi-isentropic plasma with mechanical and thermal losses and electrical resistivity
PublicationMagnetosonic periodic perturbations in a uniform and infinite plasma model are considered. Damping due to compressional viscosity, electrical resistivity, and thermal conduction are taken into account, as well as some heating–cooling function, which may destroy the isentropicity of wave perturbations. The wave vector forms arbitrary angle h with the equilibrium straight magnetic field, and all perturbations are functions...
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The mechanical properties and bactericidal degradation effectiveness of tannic acid-based thin films for wound care
PublicationThe surface area is the most important aspect when considering the interactions between a material and the surrounding environment. Chitosan (CTS) and tannic acid (TA) were previously successfully tested by us to obtain thin films to serve as wound dressings or food packaging materials. However, surface properties as well as the antimicrobial activity of the material were not considered. They are important if the material is likely...
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Electro-chemo-mechanical properties in nanostructured Ca-doped ceria (CDC) by field assisted sintering
PublicationRecent investigations have shown that highly oxygen defective cerium oxides generate non-classical electrostriction that is superior to lead-based ferroelectrics. In this work, we report the effect of field-assisted spark plasma sintering (SPS) on electro-chemo-mechanical properties of calcium doped ceria (CDC). Nanometric powders of Ca.10 nm are rapidly consolidated to form polycrystalline nanostructures with a high degree of...
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Mechanical analysis of eccentric defected bilayer graphene sheets considering the van der Waals force
PublicationIn this article, we have tried to simulate nonlinear bending analysis of a double-layered graphene sheet which contains a geometrical imperfection based on an eccentric hole. The first-order shear deformation theory is considered to obtain the governing equations. Also, the nonlinear von Kármán strain field has been assumed in order to obtain large deformations. Whereas the double-layered graphene sheet has been considered, the...
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Nonlinear dynamic analysis of the pure “buckling” mechanism during blow-out trauma of the human orbit
PublicationConsidering the interplay between orbital bones and intraorbital soft tissues, commonly accepted patterns of the blow-out type of trauma within the human orbit require more thorough investigation to assess the minimal health-threatening impact value. Two different three-dimensional finite element method (FEM) models of the human orbital region were developed to simulate the pure “buckling” mechanism of orbital wall fracture in...
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A novel approach for processing CaAlSiON glass-ceramics by spark plasma sintering: Mechanical and electrical properties
PublicationLithium containing glassy materials can be used as solid electrolytes or electrode materials for lithium-ion batteries due to their high energy density. Conventional melt-quenched Ca11Al14Si16O49N10 glass powder containing 24 e/o N, doped with Li-ions (1, 3, and 6 wt. %) and sintered by spark plasma sintering technique (SPS) was studied. The benefits of using SPS to produce glass-ceramics are rapid heating rates compared to conventional...
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Effects of Basalt and Carbon Fillers on Fire Hazard, Thermal, and Mechanical Properties of EPDM Rubber Composites
PublicationDue to growing restrictions on the use of halogenated flame retardant compounds, there is great research interest in the development of fillers that do not emit toxic compounds during thermal decomposition. Polymeric composite materials with reduced flammability are increasingly in demand. Here, we demonstrate that unmodified graphene and carbon nanotubes as well as basalt fibers or flakes can act as effective flame retardants...
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Poly(ε-Caprolactone)/Brewers’ Spent Grain Composites—The Impact of Filler Treatment on the Mechanical Performance
PublicationWaste lignocellulose materials, such as brewers’ spent grain, can be considered very promising sources of fillers for the manufacturing of natural fiber composites. Nevertheless, due to the chemical structure differences between polymer matrices and brewers’ spent grain, filler treatment should be included. The presented work aimed to investigate the impact of fillers’ reactive extrusion on the chemical structure and the poly(ε-caprolactone)/brewers’...
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Mangiferin Affects Melanin Synthesis by an Influence on Tyrosinase: Inhibition, Mechanism of Action and Molecular Docking Studies
PublicationMangiferin is a strong antioxidant that presents a wide range of biological activities. The aim of this study was to evaluate, for the first time, the influence of mangiferin on tyrosinase, an enzyme responsible for melanin synthesis and the unwanted browning process of food. The research included both the kinetics and molecular interactions between tyrosinase and mangiferin. The research proved that mangiferin inhibits tyrosinase...
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Mechanizm budżetowania szpitali na tle przemian w finansowaniu opieki zdrowotnej w Polsce.
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Mechanizm nanokrystalizacji warstwy wierzchniej stopu Al-Si nadtapianego laserem w niskiej temperaturze.
PublicationPrzedstawiono mechanizm nanokrystalizacji stopu aluminium nadtapianego laserowo po schłodzeniu do niskiej temperatury w powiązaniu z obserwacjami struktury warstwy wierzchniej.
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FE-investigations on crack spacing in reinforced concrete beams within non-local continuum mechanics.
PublicationW artykule przedstawiono wyniki numerycznej analizy rozstawu rys w belkach żelbetowych przy zastosowaniu dwóch ciągłych modeli nielokalnych. Zbadano wpływ wielu różnych parametrów na rozstaw rys.
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Prognozowanie mocy skrawania przy przecinaniu drewna na pilarkach o prostoliniowej trajektorii ruchu pił
PublicationOpisano zastosowanie nowego podejścia do prognozowania mocy skrawania pilarek o prostoliniowej trajektorii ruchu pił (pilarki ramowe i taśmowe). W przewidywaniu mocy skrawania wykorzystano podejście ujmujące osiągnięcia współczesnej mechaniki pękania.
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Marek Dzida dr hab. inż.
PeopleHe was born on 6 August 1953 in Bielsko-Biała. He is a graduate of the Institute of Shipbuilding at Gdańsk University of Technology. Since 1978 he has been working at Faculty of Ocean Engineering and Ship Technology at GUT. In 1983 he received the title of Doctor of Technical Sciences, and in 2001 – the title of Doctor with habilitation. He is currently employed as Associate Professor at GUT. He worked as vice-dean for Education...
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Wpływ cyklicznego ścinania na przebieg lokalizacji odkształceń w gruntach piaszczystych.XIII Krajowa Konferencja Mechaniki Gruntów i Fundamentowania.
PublicationOmówiono wpływ cyklicznego ścinania na lokalizację odkształceń stycznych w materiałach granulowanych. Obliczenia wykonano metodą elementów skończonych na bazie mikropolarnego prawa hipoplastycznego dla wąskiej warstwy piasku. Obliczenia wykonano dla dużej amplitudy ścinania i piasku zagęszczonego.
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Symulacja numeryczna ścinania w aparatach bezpośredniego i prostego ścinania. XIII Krajowa Konferencja Mechaniki Gruntów i Fundamentowania.
PublicationOmówiono wpływ różnych warunków brzegowych w dwóch różnych aparatach ścinania. Obliczenia wykonano metodą elementów skończonych na bazie mikropolarnego prawa hipoplastycznego dla aparatu bezpośredniego ścinania i prostego ścinania. Obliczenia wykonano dla piasku zagęszczonego.
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PROBABILISTYCZNY MODEL PROCESU OBCIĄŻEŃ MOCĄ OKRĘTOWEGO TŁOKOWEGO SILNIKA GŁÓWNEGO I JEGO PRAKTYCZNA PRZYDATNOŚĆ
PublicationW artykule przedstawiono propozycję modelu widma obciążeń mocą okrętowego silnika głównego w formie czterostanowego procesu semi-Markoawa {D(t): t ≥0} ciągłego w stanach i czasie o zbiorze stanów C = {c1, c2, c3, c4} i następującej interpretacji elementów tego zbioru: c1 – obciążenie silnika mocą częściową, c2 – obciążenie silnika mocą trwałą, c3 – obciążenie silnika mocą znamionową, c4 – obciążenie silnika mocą maksymalną. Określono...
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Survivin expression in invasive pituitary gland adenomas with a diameter exceeding 20 mm
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Anna Jakubczyk-Gałczyńska dr inż.
People2012r. 15th International Symposium of Students and Young Mechanical Engineers "Advances in chemical and mechanical engineering" w Gdańsku - publikacja 2014r. XIV Konferencja Naukowa Doktorantów Wydziałów Budownictwa w Szczyrku - referat i publikacja 2014r. ICEE-2014 - International Conference on Environmental Engineering w Wilnie - publikacja 11.2015r. XIV Sympozjum Wpływy Sejsmiczne...
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American Society of Mechanical Engineers
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Izvestiya Saratovskogo Universiteta Novaya Seriya-Matematika Mekhanika Informatika
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Jacek Tomków dr hab. inż.
PeopleEducation:1. 2018 - Ph.D. of Technical Sciencesin field of Materials Engineeringthesis: Influence of underwater welding conditions on cold cracking of high strength low alloy steel 2. 2012 - Master of Science Engineer, Gdansk University of Technologyin the field of: Mechanical Engineeringwith specialization in: Manufacturing Engineering and Computer Aided Manufacturing Processesthesis: Non-destructive testing of welding joints...
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Victor Eremeev prof. dr hab.
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Technika Poszukiwań Geologicznych, Geotermia, Zrównoważony Rozwój
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Wiktoria Wojnicz dr hab. inż.
PeopleDSc in Mechanics (in the field of Biomechanics) - Lodz Univeristy of Technology, 2019 PhD in Mechanics (in the field of Biomechanics) - Lodz Univeristy of Technology, 2009 (with distinction) List of papers (2009 - ) Wojnicz W., Wittbrodt E., Analysis of muscles' behaviour. Part I. The computational model of muscle. Acta of Bioengineering and Biomechanics, Vol. 11, No.4, 2009, p. 15-21 Wojnicz W., Wittbrodt E., Analysis of...
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Ekstrakcja micelarna : dogodna technika izolacji i wzbogacania analitów z ciekłych próbek środowiskowych.
PublicationDążność do coraz dokładniejszego poznania składu chemicznego różnych obiektów materialnych oraz procesów, które w nich zachodzą sprawia, że cały czas trwają poszukiwania nowych rozwiązań metodycznych w zakresie izolacji i/lub wzbogacania analitów przed etapem ich oznaczania. W artykule przedstawiono informacje na temat:- podstaw teoretycznych ekstrakcji micelarnej znanej również jako ekstrakcji punktu zmętnienia,-zalet i ograniczeń...
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Ekstrakcja micelarna jako dogodna technika izolacji i wzbogacania analitów z próbek środowiskowych
PublicationOdpowiednie techniki ekstrakcji analitów stanowią bardzo istotny etap procedur śladowych i ultraśladowych ilości analitów z próbek, które charakteryzują się złożonym składem matrycy.W artykule przedstawiono podstawowe informacje o technice ekstrakcji micelarnej zwanej również ekstrakcją do punktu zmętnienia, które znajduje zastosowanie na etapie izolacji z próbek środowiskowych szerokiego spektrum analitów (metale, związki organiczne).Technikę...
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Obraz "Bez tytułu", technika akrylowa na papierze. Wymiary: 75 x 75 cm.
PublicationPierwsza prezentacja obrazu na wystawie "Differentia specifica" w Galerii Feininger w Trzebiatowskim Ośrodku Kultury w Trzebiatowie w terminie 31 lipca do 31 sierpnia 2021. Obraz "Bez tytułu", technika akrylowa na papierze. Wymiary: 75 x 75 cm. Rok powstania: 2021
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Technika spektrometrii mas rozcieńczania izotopowego jako narzędzie dla poprawy jakości wyników analitycznych
PublicationTechnika spektrometrii mas rozcieńczania izotopowego (IDMS) jako pierwotna technika pomiarowa jest bezpośrednio związana z układem SI i odgrywa niezwykle istotną rolę w zapewnieniu spójności pomiarowej - jest zalecana przede wszystkim w przeprowadzaniu badań certyfikacyjnych. Z tego względu znajduje się coraz powszechniejsze zastosowanie w analityce chemicznej a w szczególności w zakresie analityki środowiskowej. W pracy przedstawiono...
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Technika instrumentalna i parametry eksploatacyjne gradientowej elektrochromatografii kapilarnej i przykłady jej zastosowania.
Publication.
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Mechanical properties of concrete mixes M0-M100 concrete mixes
Open Research DataDataset of hardneded properties of concretes containing different amount of magnetite aggregate (M0-M100) mixes.Excel file consists results of:
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Mechanical lithography in a polymer substrate using AFM in contact mode
Open Research DataMechanical lithography in a polymer substrate. Contact mode. NTEGRA Prima (NT-MDT) device. NSG 01 probe.
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The effect of wax foundation addition to PCL filaments on mechanical properties.
Open Research DataThe dataset includes the effect of wax foundation addition on the basic mechanical properties of the filaments. PCL and wax foundation addition at 10 and 15% were used for extrusion. The mechanical properties of the resulting filaments were evaluated by a double compression test using an Instron model 5543 universal testing machine. Parameters such...
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The impedance method of monitoring the degradation of rubber linings in applications where progressive deterioration is the predominant failure mechanism
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Mollecular mechanism and chemicl kinetic description of nitrobenzene liquid membrane oscillator containing benzyldimethyltetradecylammonium chloride surfactant
PublicationBadano oscylacje róznicy potencjału między fazami wodnymi oscylatora z nitrobenzenową membraną ciekłą zawierającego chlorek benzylodimetylotetradecyloamoniowy. Opisano chemię fizyczną tego oscylatora oraz omówiono rolę efektów hydrodynamicznych w powstawaniu oscylacji. Zaproponowano nowy mechanizm oparty na transferze masy par jonowych. Oscylacje są generowane na granicy faza akceptowa/ membrana ciekła i są spowodowane autokatalityczną...
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Gluten-Free Bread with Cricket Powder—Mechanical Properties and Molecular Water Dynamics in Dough and Ready Product
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Nanocomposites of Graphene Oxide—Silver Nanoparticles for Enhanced Antibacterial Activity: Mechanism of Action and Medical Textiles Coating
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Ab-initio investigations for structural, mechanical, optoelectronic, and thermoelectric properties of Ba2SbXO6 (X Nb, Ta) compounds
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Comparison of radical-driven technologies applied for paraben mixture degradation: mechanism, biodegradability, toxicity and cost assessment
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