Filtry
wszystkich: 23958
wybranych: 6679
-
Katalog
- Publikacje 6679 wyników po odfiltrowaniu
- Czasopisma 414 wyników po odfiltrowaniu
- Wydawnictwa 1 wyników po odfiltrowaniu
- Osoby 269 wyników po odfiltrowaniu
- Wynalazki 39 wyników po odfiltrowaniu
- Projekty 60 wyników po odfiltrowaniu
- Laboratoria 6 wyników po odfiltrowaniu
- Zespoły Badawcze 20 wyników po odfiltrowaniu
- Aparatura Badawcza 2 wyników po odfiltrowaniu
- Kursy Online 1017 wyników po odfiltrowaniu
- Wydarzenia 31 wyników po odfiltrowaniu
- Dane Badawcze 15420 wyników po odfiltrowaniu
Filtry wybranego katalogu
wyświetlamy 1000 najlepszych wyników Pomoc
Wyniki wyszukiwania dla: MATERIAŁY PSEUDOCHIRALNE
-
Airborne wear particle emission from train brake friction materials with different contents of steel and copper fibres
PublikacjaThis study investigated the influence of the amount of steel and copper fibres in a train brake friction material on the tribological performance, emission intensity and characteristics of airborne wear particles. The particles were generated on a pin-on-disc tribometer under controlled friction and environmental conditions. It was found that the steel fibre results in a more intensive emission of 0.3–10 μm particles compared to...
-
The valance state of vanadium-key factor in the flexibility of potassium vanadates structure as cathode materials in Li-ion batteries
PublikacjaPotassium hexavanadate (K2V6O16·nH2O) nanobelts have been synthesized by the LPE-IonEx method, which is dedicated to synthesis of transition metal oxide bronzes with controlled morphology and structure. The electrochemical performance of K2V6O16·nH2O as a cathode material for lithium-ion batteries has been evaluated. The KVO nanobelts demonstrated a high discharge capacity of 260 mAh g−1, and long-term cyclic stability up to 100...
-
Antimicrobial Activity of Al2O3, CuO, Fe3O4, and ZnO Nanoparticles in Scope of Their Further Application in Cement-Based Building Materials
Publikacja -
Estimation, optimization and analysis based investigation of the energy consumption in machinability of ceramic-based metal matrix composite materials
Publikacja -
Effect of boundary, shear rate and grain crushing on shear localization in granular materials within micro-polar hypoplasticity
PublikacjaW artykule przedstawiono wpływ 3 efektów na zachowanie się materiałów granulowanych: warunku brzegowego, prędkości ścinania oraz miażdżenia ziaren. Obliczenia wykonano przy pomocy mikropolarnego prawa hipoplastycznego rozszerzonego o efekt prędkości ścinania i miażdżenia ziaren w oparciu o teorię mechaniki zniszczenia. Szczególna uwagę zwrócono na rozkład lokalizacji odkształceń stycznych.
-
A novel DEM-based pore-scale thermal-hydro-mechanical model for fractured non-saturated porous materials
PublikacjaDo propagacji pęknięć wykorzystano nowy oparty na DEM, termiczno-hydromechaniczny model dwufazowego przepływu płynu w skali porów rozszerzony o wymianę ciepła w nienasyconych materiałach porowatych o małej porowatości. Wykonano obliczenia numeryczne dla kohezyjnych próbek ziarnistych przy użyciu DEM w pełni sprzężonego z CFD (opartego na sieci przepływu płynu) i wymianą ciepła, który zintegrował mechanikę dyskretną z mechaniką...
-
Contact force network evolution in active earth pressure state of granular materials: photo‑elastic tests and DEM
PublikacjaArtykuł omawia ewolucję sieci sił kontaktowych w materiałach granulowanych podczas quasi-statycznego stanu aktywnego. Doświadczenia foto sprężyste zostały wykonane dla kulek szklanych. Doświadczenia zostały symulowane stosując metodę elementów dyskretnych (DEM). Model DEM prawidłowo przewidział strukturę sił kontaktowych i ich wielkość, lokalizację odkształceń oraz obszary zmian fazowych.
-
Nano-particle doped hydroxyapatite material evaluation using Spectroscopic Polarization Sensitive Optical Coherence Tomography
PublikacjaBio-ceramics such as hydroxyapatite (HAp) are widely used materials in medical applications, especially as an interface between implants and living tissues. There are many ways of creating structures from HAp like electrochemical assisted deposition, biomimetic, electrophoresis, pulsed laser deposition or sol-gel processing. Our research is based on analyzing the parameters of the sol-gel method for creating thin layers of HAp....
-
Tilting pad thrust bearing with novel material selection - experimental comparison of low and medium speed operation
PublikacjaThe advances in material engineering led to the development of hard carbon based coatings applied in numerous applications in order to prevent or minimize wear of the parts in contact. With Triondur® coatings, the bearing company Schaeffler has succeeded in halving the friction losses in the valve trains of passenger cars. The coatings are optimized for high abrasive wear protection and low sliding friction moments. Altogether...
-
Thermal analysis of macro-encapsulated phase change material coupled with domestic gas heater for building heating
Publikacja -
Electrochemical generation of microbubbles by carbon nanotube interdigital electrodes to increase the permeability and material uptakes of cancer cells
Publikacja -
Evaluation of candidate reference material obtained from selenium - enriched sprouts for the purpose of selenium speciation analysis
PublikacjaSelenium is an essential element in animals and humans. Diet supplementation with selenium-rich vegetables has better chemoprotective effect than Se (IV) and SeMet. The production of selenium-enriched vegetables requires a preliminary stage in soil preparation, which may subsequently pose a risk of soil contamination. It seems that the sprouting of seeds under controlled conditions would be a good solution for delivering SeMetSeCys...
-
Damage Analysis of Tensioning Cable Anchorage Zone of a Bridge Superstructure, Using CDP Abaqus Material Model
PublikacjaNumerical analysis of the tensioning cables anchorage zone of a bridge superstructure is presented in this paper. It aims to identify why severe concrete cracking occurs during the tensioning process in the vicinity of anchor heads. In order to simulate the tensioning, among others, a so-called local numerical model of a section of the bridge superstructure was created in the Abaqus Finite Element Method (FEM) environment. The...
-
Homogeneity study of candidate reference material (contaminated soil) based on determination of selected metals, PCBs and PAHs
PublikacjaReference materials (RMs) are an indispensable part of QA/QC system and have played a critical role in the continual expansion of analytical capabilities of the analytical laboratories. The homogeneity study of the candidate for reference material is essential for the quality of reference material (certified reference material) used in quality assurance activities. The homogeneity study of candidate for reference materials of contaminated...
-
Elimination of metal catalyst and carbon-like impurities from single-wall carbon nanotube raw material
Publikacja -
Selective Adsorption of Methyl Orange and Methylene Blue by Porous Carbon Material Prepared From Potassium Citrate
Publikacja -
Novel Quaternary TlGaSn2Se6 Single Crystal as Promising Material for Laser Operated Infrared Nonlinear Optical Modulators
Publikacja -
Application possibilities of the low-temperature repairs on creep-resistance turbine components from material GX23CrMoV12-1
Publikacja -
Evaluation of Selected Properties of Sodium Alginate-Based Hydrogel Material—Mechanical Strength, μDIC Analysis and Degradation
Publikacja -
Case Study of Old Steel Riveted Railway Truss Bridge: From Material Characterization to Structural Analysis
PublikacjaThe structural analysis of an old steel riveted railway truss bridge located over the Maruska River on the Działdowo – Olsztyn, Poland railway line is performed in this paper to check its behaviour under today’s railway loads. The mechanical properties of construction steel extracted from the old steel bridge are investigated by tensile tests, impact tests through the Charpy pendulum impact V-notch, and an optical emission spectrometer....
-
The effect of preliminary creep-strain on material behavior under LCF tension/compression and pure torsion regimes
PublikacjaThis paper presents the results of experimental tests of monotonic tension and torsion, creep-rupture and preliminary creep at 200C and 300C, as well as low-cycle fatigue of 2024 T3511 aluminum alloy. The fatigue process was conducted at room temperature for uniaxial tension/compression and torsion. The as-received material and pre-deformed material were also investigated during creep at elevated temperature. Basic monotonic,...
-
The influence of polymer bearing material and lubricating grooves layout on wear of journal bearings lubricated with contaminated water
PublikacjaThe goal of the present paper is to investigate wear properties of journal sliding bearing operating in the conditions of contaminated water lubrication. Several bearing materials and bearing sleeve designs (differing in the axial grooves position and their shape) were tested experimentally under typical operating conditions in a dedicated test rig, which was equipped with a lubricating system, enabling lubrication with contaminated...
-
Porous material-based sorbent coatings in Solid-phase microextraction technique: Recent trends and future perspectives
PublikacjaThe use of porous materials as sorbents in sample preparation techniques has gained recent scientific attention in the context of developing novel fibers for the Solid-phase microextraction (SPME) technique. SPME requires the appropriate selection of a robust sorbent for successful utilization under variable conditions. A deeper understanding of the nature of newly developed porous SPME coatings and the impact of their structures...
-
Significant Production of Thermal Energy in Partially Ionized Hyperbolic Tangent Material Based on Ternary Hybrid Nanomaterials
PublikacjaNanoparticles are frequently used to enhance the thermal performance of numerous materials. This study has many practical applications for activities that have to minimize losses of energy due to several impacts. This study investigates the inclusion of ternary hybrid nanoparticles in a partially ionized hyperbolic tangent liquid passed over a stretched melting surface. The fluid motion equation is presented by considering the...
-
The use of a two-phase Monte Carlo material model to reflect the dispersion of asphalt concrete fracture parameters
PublikacjaThe work covers comprehensive laboratory tests of semi-circular bending (SCB) of asphalt concrete samples. The results of two test series, including four and 32 SCB specimens, indicate a substantial scatter of force–deflection (F-d) histories. The numerical analysis is aimed to reflect the maximum breaking load and fracture energy of the samples, pointing out their random character. The original simulation-based fictitious Monte...
-
A Simple Replica Method as the Way to Obtain a Morphologically and Mechanically Bone-like Iron-Based Biodegradable Material
PublikacjaPorous iron-based scaffolds were prepared by the simple replica method using polyurethane foam as a template and applying the sintering process in a tube furnace. Their surface morphology was characterized using scanning electron microscopy (SEM) and phase homogeneity was confirmed using X-ray diffraction (XRD). Corrosion behavior was determined using immersion and potentiodynamic polarization methods in phosphate buffered saline...
-
Thermomagnetic behavior of a semiconductor material heated by pulsed excitation based on the fourth-order MGT photothermal model
PublikacjaThis article proposes a photothermal model to reveal the thermo-magneto-mechanical properties of semiconductor materials, including coupled diffusion equations for thermal conductivity, elasticity, and excess carrier density. The proposed model is developed to account for the optical heating that occurs through the semiconductor medium. The Moore–Gibson–Thompson (MGT) equation of the fourth-order serves as the theoretical framework...
-
Properties of Cutting Tool Composite Material Diamond–(Fe–Ni–Cu–Sn) Reinforced with Nano-VN
Publikacja -
FE analysis of a coupled energetic-statistical size effect in plain concrete beams with varying material properties.
PublikacjaThe numerical FE investigations of a coupled energetic-statistical size effect in unnotched concrete beams of similar geometry under quasi-static three point bending were performed within elasto-plasticity with non-local softening. The stochastic FE analyses were carried out with three different beam sizes. Deterministic calculations were performed with the uniform distribution of a uniaxial tensile strength. In statistical calculations...
-
Resonant Frequencies in Microstrip Structure with Omega Medium Substrate
PublikacjaThe paper presents the research on a rectangular microstrip structure with multilayer substrate containing dielectric and omega medium layers. The effect of pseudochiral medium layer location in the substrate and its thickness on the resonant frequency of the rectangular microstrip structure is investigated. The numerical analysis of investigated structures is based on expansion of electric and magnetic fields. Utilizing the continuity...
-
Wpływ technologii przetwarzania na właściwości użytkowe stali trudno ścieralnych typu HARDOX. II Krajowa Konferencja ''Nowe Materiały, Nowe Technologie w Przemyśle Okrętowym i Maszynowym.
PublikacjaW referacie przedstawiono zagadnienia dotyczące technologii przetwarzania stali HARDOX, jak również zalecenia odnośnie spawania złączy stali HARDOX w zależności od grubości materiału, miejsca spawania, rodzaju spawania, rodzaju złącza, materiałów spoiwa. Dodatkowo przedstawiono zalecenia dotyczące obróbki skrawaniem stali HARDOX 400 w porównaniu do stali WELDOX 500 i WEL-DOX 700.
-
Specjalistyczne laboratorium techniki wysokich napięć. Materiały pomocnicze.P. Gdań. [online] [dostęp 30.12.2003]. Dostępny w World Wide Web: http:// www.ely.pg.gda.pl/wnae/index1.html) [84 s.]
Publikacja.
-
Wpływ stanu zachowania materiału konstrukcyjnego na nośność zabytkowych drewnianych słupów, w żuławskich domach podcieniowych, z XVIII i XIX wieku.
PublikacjaPowstało wiele opracowań dotyczących zagadnień architektonicznych domów podcieniowych na Żuławach, ale brak na ten temat publikacji dotyczących problematyki techniczno-konserwatorskiej. Niniejszy artykuł jest fragmentem badań prowadzonych obecnie przez autora. Jest pierwszą próbą wykonania analizy statyczno- wytrzymałościowej wybranych, zabytkowych drewnianych podcieni z obszaru Delty Wisły, wraz z opisem stanu zachowania. W tekście...
-
Elektrochemiczne układy stosowane w urządzeniach do magazynowania energii
PublikacjaW pracy przedstawiono badania materiałów związanych z chemicznymi źródłami prądu, w tym materiały dla kondensatorów elektrochemicznych, nowoczesnych akumulatorów litowych oraz tanie materiały aktywne w świetle widzialnym
-
Determination of bulk solid concentration changes during granular flow in a silo with ECT sensors
PublikacjaW artykule przedstawiono wyniki doświadczeń pomiaru zmian koncentracji materiału granulowanego podczas przepływu silosowego. Zmiany zostały pomierzone przy pomocy tomografu. Doświadczenia wykonano w silosie cylindrycznym dla 2 różnych szorstkości ścian i różnych zagęszczeń suchego piasku.
-
Modelowanie wybranych własności mechanicznych struktur po-rowatych przeznaczonych na trzony długoterminowych implan-tów ortopedycznych, otrzymywanych z wykorzystaniem metod micro-CT oraz SLM
PublikacjaArtykuł przedstawia metodologię opracowania geometrii materiału porowatego opartego na bazie stopu tytanu. W metodologii tej dąży się do uzyskania struktury porowatej jak najbardziej zbliżonej do struktury zdrowej tkanki kostnej, bazującej na rzeczywistych modelach geometrycznych uzyskanych ze zdjęć rentgenowskich z tomografii komputerowej. Rzeczywisty materiał po odpowiedniej obróbce modelu geometrycznego oraz przy zachowaniu...
-
Deep insight into the pore size distribution of N-doped porous carbon materials on electrochemical energy storage and CO2 sorption
Publikacja -
Advanced Experimental and Numerical Analysis of Behavior Structural Materials Including Dynamic Conditions of Fracture for Needs of Designing Protective Structures
Publikacja -
Selective Laser Sintering And Melting Of Pristine Titanium And Titanium Ti6Al4V Alloy Powders And Selection Of Chemical Environment For Etching Of Such Materials
Publikacja -
Are raw materials or composting conditions and time that most influence the maturity and/or quality of composts? Comparison of obtained composts on soil properties
Publikacja -
New ceramic materials derived from pyrolyzed poly(1,2-dimethylsilazane) and starch as a potential anode for Li-ion batteries
PublikacjaNewmaterialswere obtained by pyrolysis of starch (S) and poly(1,2-dimethylsilazane) (PSN) (weight ratio: PSN/S 30/70) at temperature a) 500 °C, b) 700 °C and c) 900 °C. Ceramic materials were characterized by infrared spectroscopy, TGA, Raman spectroscopy and SEM. New Si\O and shifted Si\C stretching vibration modes emerged confirming direct interaction between silicon originating fromsilazane and oxygen coming fromstarch. The...
-
Przegląd metod stosowanych do określania parametrów termofizycznych materiałów zmiennofazowych ze szczególnym uwzględnieniem skaningowej kalorymetrii różnicowej
PublikacjaPrzedstawiono najczęściej stosowane metody analizy termicznej (TA) do określania parametrów termofizycznych materiałów zmiennofazowych (PCM). Określenie właściwości termofizycznych, m.in. takich jak temperatura topnienia/krzepnięcia, temperatura rozkładu, entalpia, ciepło właściwe jest bardzo istotne przy wyborze danego materiału do konkretnych aplikacji. Przedstawione metody pozwalają na szybką analizę zjawisk i procesów zachodzących...
-
Influence of Storage Time and Temperature on the Toxicity, Endocrine Potential, and Migration of Epoxy Resin Precursors in Extracts of Food Packaging Materials
PublikacjaThe aim of the present study was to establish a standard methodology for the extraction of epoxy resin precursors from several types of food packages (cans, multi-layered composite material, and cups) with selected simulation media (distilled water, 5% ethanol, 3% dimethyl sulfoxide, 5% acetic acid, artificial saliva) at different extraction times and temperatures (factors). Biological analyses were conducted to determine the acute...
-
Ti-doped Sr2Fe1.4-xTixMo0.6O6-δ double perovskites with improved stability as anode materials for Solid Oxide Fuel Cells
Publikacja -
High Cu content LaNi1-xCuxO3-δ perovskites as candidate air electrode materials for Reversible Solid Oxide Cells
Publikacja -
Ruddlesden-Popper-type Nd2-xNi1-yCuyO4±δ layered oxides as candidate materials for MIEC-type ceramic membranes
Publikacja -
Eco-Friendly Electromagnetic Interference Shielding Materials from Flexible Reduced Graphene Oxide Filled Polycaprolactone/Polyaniline Nanocomposites
PublikacjaHybrid nanocomposites have the unique ability of enhancing material properties due to the existing synergistic effect of the fillers. In this study, the authors report such an eco-friendly hybrid nanocomposite comprising of polyaniline and reduced graphene oxide in polycaprolactone. The conducting polyaniline improved the processability of polycaprolactone, and the final composites were prepared by incorporating graphene oxide...
-
Polyurethane glycolysate from industrial waste recycling to develop low dielectric constant, thermally stable materials suitable for the electronics
PublikacjaWe are utilizing a new method to improve the dielectric properties of a conventional polymer using a recycled polymer product. The polyurethane foams are recycled by glycolysis process and the derived material was applied to improve the dielectric properties of the brittle DGEBA epoxy resin. Two main parameters that determine the applicability of the material as a dielectric (the dielectric constant and dielectric loss), were studied...
-
Flexible Films as Anode Materials Based on rGO and TiO2/MnO2 in Li-Ion Batteries Free of Non-Active Agents
Publikacja -
Support Materials of Organic and Inorganic Origin as Platforms for Horseradish Peroxidase Immobilization: Comparison Study for High Stability and Activity Recovery
PublikacjaIn the presented study, a variety of hybrid and single nanomaterials of various origins were tested as novel platforms for horseradish peroxidase immobilization. A thorough characterization was performed to establish the suitability of the support materials for immobilization, as well as the activity and stability retention of the biocatalysts, which were analyzed and discussed. The physicochemical characterization of the obtained...