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wyświetlamy 1000 najlepszych wyników Pomoc
Wyniki wyszukiwania dla: road and highway materials
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Influence of Thermal Decomposition of Wood and Wood-Based Materials on the State of the Atmospheric Air. Emissions of Toxic Compounds and Greenhouse Gases
PublikacjaThis paper presents the energy characteristics of wood and wood-based materials in the form of commercially available pellets, furniture board (MDF) and OSB. Toxicometric indices were determined for gaseous destructs arising from thermal decomposition and combustion of the materials studied. The paper proves that combustion conditions are crucial in terms of toxic destructive emissions. It has been shown that the combustion of...
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Simulations of Shear Zones and Cracks in Engineering Materials Using eXtended Finite Element Method
PublikacjaNumerical simulations of cracks and shear zones in quasi-brittle materials are presented. Extended Finite Element Method is used to describe both cracks and shear zones. In a description of tensile cracks, a Rankine criterion is assumed. A discrete Mohr-Coulomb law is adopted for simulations of shear zones. Results of simple numerical tests: unixial tension, bending and biaxial compression are demonstrated.
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Video data recorded on S7 road
Dane BadawczeThe set consists of video data recorded employing camera LevelOne FCS-5102. The purpose of the experiment was to gather vehicle traffic recordings in real conditions – on the S7 motorway, near Dworek village (54°14'40.0"N 18°59'59.0"E).
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Selection of material for X-ray tomography analysis and DEM simulations: comparison between granular materials of biological and non-biological origins
PublikacjaPhysical properties and X-ray tomography images of five different granular materials: glass bead, glass grit, short grain white rice, sorghum and clay granules (Seramis) are investigated to select the most promising materials for numerical simulations and time-lapse X-ray tomography imaging. The examined materials represent granular materials of non-biological origin (glass bead, glass grit and Seramis) and granular plant materials...
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FBG Strain Monitoring of a Road Structure Reinforced with a Geosynthetic Mattress in Cases of Subsoil Deformation in Mining Activity Areas
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Comparison of antimicrobial activity of selected, commercially available wound dressing materials
PublikacjaOBJECTIVE: The aim of our study was to examine the antimicrobial potential of eight selected, commercially available wound dressings containing different antimicrobial agents: silver, chlorhexidine acetate, povidone-iodine, and manuka honey. METHOD: The materials were tested against four reference strains of bacteria: Staphylococcus aureus (PCM 2051), Staphylococcus epidermidis (PCM 2118), Pseudomonas aeruginosa (ATCC 27853),...
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Driver influence on tyre/road noise generated by vehicle in road traffic.Wpływ kierowcy na hałas generowany przez pojazd w ruchu drogowym.
PublikacjaW pracy omówiono wkływ stylu jazdy kierowcy oraz stanu technicznego wybranych zespołów pojazdu na jego hałas generowany w ruchu drogowym. Wpływ został przeanalizowany w aspekcie takich parametrów, jak: prędkość jazdy, obciążenie kół siłami wzdłużnumi i poprzecznymi, ciśnienie w ogumieniu, obciążenie pionowe kół, zbieżność i inne.
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A study of modern materials for arc spraying
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Tools for finishing processes on hard materials
PublikacjaPrzedstawiono narzędzia i wyniki obróbki materiałów w stanie twardym. Analizowano proces docierania elementów ceramicznych mikroziarnami diamentowymi, nagniatanie stali w stanie twardym (60 HRC) kulkami z Si3N4 i przecinanie ściernicowe stali ŁH15 (62 HRC).
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Difficulties with evaluating resistance of materials to cavitation.
PublikacjaW pracy dokonano analizy wyników Międzynarodowego Testu Erozji Kawitacyjnej (ICET), któremu koordynował Instytut Maszyn Przepływowych Polskiej Akademii Nauk (IMP PAN) w Gdańsku. Kluczowe parametry wpływające na zmianę przebiegu krzywych erozji uzyskanych na stanowiskach badawczych zostały wskazane. Wykazano konieczność przeprowadzenia badań w zakresie oceny wpływu efektu skali. Zaprezentowano wyniki uzyskane na stanowiskach magnetostrykcyjnych...
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Materials for potentiometric electrochemical gas sensors
PublikacjaPublikacja przeglądowa na temat zasady działania oraz rodzajów czujników elektrochemicznych gazów.
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Scale effects in cavitation erosion of materials
PublikacjaW pracy przedstawiono wpływ wielkości objętości erodowanego materiału na przebieg krzywych erozyjnych. Przedstawiono również niektóre wyniki Międzynarodowego Testu Kawitacyjnego.
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Toxic components of food packaging materials
PublikacjaW rozdziale scharakteryzowano materiały wykorzystywane do produkcji opakowań do żywności i stosowane składniki dodatkowe, polepszające ich użytkowe właściwości oraz przeanalizowano możliwość migracji niektórych substancji toksycznych z tych opakowań do produktów żywnościowych.
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Moleculars Materials in Optoelectronics and Photovoltaic Devices
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Building materials in context for sustainable development
PublikacjaInterpretacja pojęcia ''budownictwo zrównoważone''. Zadania, cele i przykłady interpretacji realizacji budownictwa w kontekście zasad zrównoważonego rozwoju. Wskaźniki zrównoważenia stosowane w budownictwie.
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Future Directions in Quantum Materials Synthesis
PublikacjaThe following sections are included: Introduction The Current State of the Art The Frontiers Exploring the Frontiers Conclusion
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Functional 3D-Printed Polymeric Materials with Metallic Reinforcement for Use in Cut-Resistant Gloves
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Advances in Hard–to–Cut Materials: Manufacturing, Properties, Process Mechanics and Evaluation of Surface Integrity
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Materials Selection and Design Options Analysis for a Centrifugal Fan Impeller in a Horizontal Conveyor Dryer
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A 95-Year-Old Concrete Arch Bridge: From Materials Characterization to Structural Analysis
PublikacjaThe structural analysis of a 95-year-old concrete arch bridge located in Jagodnik (Poland) is performed in this paper, in order to check its behavior under today’s traffic loads. The mechanical properties of both the concrete and the reinforcement are investigated by testing cores and bar stubs extracted from the bridge. Structural analysis confirms that the bridge meets today’s load requirements in terms of bearing capacity, serviceability...
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Novel temperature operated electrooptical materials based on K2ZnCl4: PVA polymer nanocomposites
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Selection of Materials Used in Viscous Clutch With ER Fluid Working in Special Conditions
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Correlations between the wear of car brake friction materials and airborne wear particle emissions
PublikacjaAirborne wear particles emitted from transport vehicle brakes are one of the main sources of toxic metals in inhalable particulate matter. Prediction of wear particle emissions may become more accurate if the relationship between the wear and particle emission characteristics is known. An experimental study was performed to investigate proportional correlations between the mass wear, 0.01–0.42 μm particle emission measured by a NanoScan...
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New empirical correlations for the viscosity of selected organic phase change materials
PublikacjaAlthough there are many methods and instruments for measuring viscosity, it is still difficult to determine a reliable value of the dynamic viscosity of complex chemicals such as paraffins and fatty acids. This is due to the complex and heterogeneous structure of these compounds in the case of commercial products. On the other hand, the measuring instrument should be selected very carefully, including its measuring principle and...
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Surface effects of network materials based on strain gradient homogenized media
PublikacjaThe asymptotic homogenization of periodic network materials modeled as beam networks is pursued in this contribution, accounting for surface effects arising from the presence of a thin coating on the surface of the structural beam elements of the network. Cauchy and second gradient effective continua are considered and enhanced by the consideration of surface effects. The asymptotic homogenization technique is here extended to...
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Study of the process of tool forming made of high-strength materials
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Challenges and opportunities related to the use of sewage sludge ash in cement-based building materials – A review
PublikacjaDue to the increasingly demanding legal regulations, regarding both sewage sludge (SS) and solid residues obtained during its thermal utilization processes, new solutions to limit their negative impact on the environment are sought. One approach that eliminates the risk of sewage sludge ash (SSA) is its use in cement building materials. The article contains a detailed literature review regarding the use of SSA in mortars and concretes,...
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Technical English 2 – supplementary materials
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Technical English 3 – supplementary materials
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Technical English 4 – supplementary materials
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Emission of 1.3–10 nm airborne particles from brake materials
PublikacjaOperation of transport vehicle brakes makes a significant contribution to airborne particulate matter in urban areas, which is subject of numerous studies due to the environmental concerns. We investigated the presence and number fractions of 1.3–10 nm airborne particles emitted from a low-metallic car brake material (LM), a non-asbestos organic car brake material (NAO) and a train brake cast iron against a cast iron. Particles...
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Pedestrian crossing safety management - Erasmus + European Road Safety Partnership EuroS@P
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Quenching of bright and dark excitons via deep states in the presence of SRH recombination in 2D monolayer materials
PublikacjaTwo-dimensional (2D) monolayer materials are interesting systems due to an existence of optically non-active dark excitonic states. In this work, we formulate a theoretical model of an excitonic Auger process which can occur together with the trap-assisted recombination in such 2D structures. The interactions of intravalley excitons (bright and spin-dark ones) and intervalley excitons (momentum-dark ones) with deep states located...
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[IMa] Electrical methods of materials and structures characterization 2024
Kursy Online{mlang pl} Dyscyplina: inżynieria materiałowa Zajęcia fakultatywne dla doktorantów I i II roku Prowadzący: prof. dr hab. inż. Piotr Jasiński Liczba godzin: 15 Forma zajęć: wykład/seminarium {mlang} {mlang en} Discipline: materials engineering Facultative course for 1st and 2nd year PhD students Academic teachers: prof. dr hab. inż. Piotr Jasiński Total hours of training: 15 teaching hours Course type: lecture/seminar {mlang}
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Computer-aided design and selective laser melting of porous biomimetic materials
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Effective density of airborne wear particles from car brake materials
PublikacjaPeople living in urban environments are subject to high health risks due to various anthropogenic sources of airborne particulate matter, including wear of transport vehicle brakes. Studies of airborne particles often require an estimate of the effective particle density, a property that allows correct matching of mass and size characteristics measured by different aerosol instruments. In this study we investigated the effective...
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Antibacterial polyurethanes, modifed with cinnamaldehyde, as potential materials for fabrication of wound dressings
PublikacjaThe epidermis is a skin layer, which protects an organism from the different factors of external environment. Therefore, the fast and effective regeneration of epidermis is important. Potential materials used for epidermis regeneration may be polyurethane scaffolds in form of the thin permeable layers. One and main disadvantage of such polyurethane scaffolds are their lack of antibacterial and antifungal properties. The great proposition...
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New matrix-free reference materials of volatile compounds - application of glass fibres as support materials for surface compounds
PublikacjaTechnika termicznego rozkładu związków powierzchniowych, znana od ponad dziesięciu lat, ulega ciągłym udoskonaleniom w celu otrzymywania coraz szerszej gamy wzorców analitycznych występujących na coraz niższych poziomach stężeń. Początkowo w roli nośnika stosowano żel krzemionkowy, który w trakcie dalszych faz rozwoju tej techniki zastąpiono kolejno szkłem porowatym, a następnie włóknem szklanym. W ostatnim czasie uproszczono układ...
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Computer aided materials design of PM duplex stainless steels
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Exploring the Relationship between Particulate Matter Emission and the Construction Material of Road Surface: Case Study of Highways and Motorways in Poland
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METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
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Aquaporins in the male reproductive system: A chance for paternity or a road to nowhere?
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Preparation and implementation of the National Road Safety Programme GAMBIT 2005
PublikacjaKrajowy Program BRD GAMBIT 2005 jest spójny z najwazniejszymi dokumentami dotyczącymi rozwoju systemu transportu w Polsce (Polityka Transportowa, Strategia Rozwoju Transportu). Jest też spójny z III Planem BRD Unii Europejskiej. Program ten daje możliwość zintensyfikowania działań prewencyjnych, prowadzonych w celu ochrony zycia i zdrowia uczestników ruchu drogowego. Efektem tego programu będzie uratowanie życia kilkunastu tysiącom...
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Directivity of tire/road noise emission for selected tires and pavements
PublikacjaPraca pośwoęcona jest kierunkowości emisji hałasu opon i nawierzchni drogowych. Opony są dominującym źródłem haasu w pojaździe poruszającym się w typowych warunkach ruchu drogowego. Hałas ten nie jest bezkierunkowy jak to przyjmuje się w modelach obliczeniowych hałasu. Takie założenia wynikają z ograniczonej dostępności danych dotyczących kierunkowości i mogą prowadzić do niedokładności przy prognozowaniu hałasu drogowego. Praca...
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The contribution of tire/road noise to the overal noise of cars and motocycles
PublikacjaOmówiono wływ hałasu opon i hałasu jednostki napędowej na całkowity hałas generowany przez pojazd. Zaprezentowano opracowany w Katedrze pojazdów i Maszyn Roboczych PG program VENOM do symulacji halasu pojazdów w ruchu drogowym. Przy pomocy tego programu określono wpływ zmiennych warunków ruchu drogowego na hałas generowany przez pojazd. Uwzględnioino przyspieszanie na poszczególnych biegach, hamowanie z różnymi prędkościami oraz...
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India’s ‘Neighbourhood First’ policy and the Belt & Road Initiative (BRI)
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Selective monitoring of noise emitted by vehicles involved in road traffic
PublikacjaAn acoustic intensity probe was developed measures the sound intensity in three orthogonal directions, making possible to calculate the azimuth and elevation angles, describing the sound source position. The acoustic sensor is made in the form of a cube with a side of 10 mm, on the inner surfaces of which the digital MEMS microphones are mounted. The algorithm works in two stages. The first stage is based on the analysis of sound...
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Novel luminescent calixarene-based lanthanide materials: From synthesis and characterization to the selective detection of Fe3+
PublikacjaCalix[n]arene-based coordination networks are an emerging class of materials with intriguing properties resulted from the presence of the cavity-like structure of the macrocycle and metallic nodes. In this work, four novel luminescent materials based on calix[4]arene-carboxylate and lanthanides (Eu3þ and Tb3þ) were prepared by two synthetic approaches, solvothermal (CDA-Eu-ST) and slow diffusion (CDA-Eu-RT, CDA-Tb-RT, CTA-Tb-complex)...
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Mechanical Strength and Thermal Properties of Cement Concrete Containing Waste Materials as Substitutes for Fine Aggregate
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New Method for Photoactive Cement Preparation—Selected Mechanical Properties and Photocatalytic Activity of New Materials
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