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Numerical and experimental study on effect of boundary conditions during testing of stiffened plates subjected to compressive loads
PublikacjaThis study analyses the effect of boundary conditions during testing on the structural behaviour stiffened plates with different thicknesses subjected to compressive loads. The goal of the compressive tests is to analyse the ultimate strength of a stiffened plate. During the test, relevant physical quantities are measured and investigated. The supporting structure's behaviour is investigated by analysing the force-displacements...
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Improvement of CO2 absorption and inhibition of NH3 escape during CaCO3 precipitation in the presence of selected alcohols and polyols
PublikacjaThis research aims to investigate the effect of selected organic substances containing hydroxyl groups on the reduction of NH3 escape and the improvement of CO2 capture during the precipitation of calcium carbonate by carbonation method using post-distillation liquid from the Solvay process and gas stream containing CO2 in the amount corresponding to the exhausted gases produced by the combustion of fossil fuels. Glycerol, ethylene...
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Rheology of Variable Viscosity‐Based Mixed Convective Inclined Magnetized Cross Nanofluid with Varying Thermal Conductivity
PublikacjaCross nanofluid possesses an extraordinary quality among the various fluidic models to explore the key characteristics of flowing fluid during very low and very high shear rates and its viscosity models depend upon shear rate. The current study establishes the numerical treatment regarding variable viscosity‐based mixed convective inclined magnetized Cross nanofluid with var‐ ying thermal conductivities over the moving permeable...
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Quantitative estimation of volume changes of granular materials during silo flow using X-ray tomography.
PublikacjaW artykule przedstawiono wyniki badań doświadczalnych nad zmianami objętościowymi materiału granulowanego podczas przepływu silosowego. Badania wykonano przy zastosowaniu tomografii rentgenowskiej. Wyniki porównano z wynikami doświadczalnymi przy zastosowaniu cyfrowej obróbki zdjęć płynącego materiału.
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Computations of size effects in granular bodies within micro-polar hypoplasticity during plane strain compression.
PublikacjaArtykuł omawia deterministyczny i statystyczny efekt skali w materiałach granulowanych podczas sciskania w płaskim stanie odkształcenia. Obliczenia wykonano metodą elementów skończonych na bazie mikropolarnego prawa hipoplastycznego. Wykorzystano metodę hiperłacińskiego próbkowania.
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FE-modeling of shear resistance degradation in granular materials during cyclic shearing under CNS condition
PublikacjaW artykule przedstawiono wyniki numerycznej analizy degradacji wytrzymałości na ścinanie w materiałach granulowanych podczas cyklicznego ścinania z warunkiem stałej sztywności normalnej. Obliczenia wykonano przy zastosowaniu metody elementów skończonych i mikropolarnego modelu hipoplastycznego.
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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...
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DEM investigations of two-dimensional granular vortex- and anti-vortex- structures during plane strain compression.
PublikacjaDEM investigations of two-dimensional granular vortex- and anti-vortex- structures during plane strain compression.
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Micro-modelling of shear localization during quasi-static confined granular flow in silos using DEM
PublikacjaThe paper deals with the quasi-static confined flow of cohesionless sand in a plane strain model silo with parallel walls and a slowly movable bottom. Numerical modelling was carried out by the discrete element method (DEM) using spheres with contact moments to approximately capture a non-uniform shape of sand particles. Different initial void ratios of sand and silo wall roughness grades were employed. Regular triangular grooves...
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Dariusz Dąbrowski dr hab. inż.
OsobyDariusz Dąbrowski ukończył studia w Instytucie Okrętowym Politechniki Gdańskiej, a w 1987 roku podjął pracę na tej uczelni na stanowisku asystenta w Zakładzie Organizacji Przemysłu Okrętowego w ówczesnym Instytucie Organizacji i Projektowania Systemów Produkcyjnych. W 1990 roku wyjechał na stypendium TEMPUS, UE, i spędził 14 miesięcy na Uniwersytecie w Sheffield, gdzie uczestniczył w programie Master of Business Administration...
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Otrzymanie tłuszczu smażalniczego na drodze enzymatycznego przeestryfikowania oleju rzepakowego i łoju wołowego. Obtaining of frying fat by enzymatic interesterification of rapeseed oil and tallow.
PublikacjaTłuszcz strukturyzowany otrzymywano na drodze enzymatycznego przeestryfikowania mieszaniny oleju rzepakowego i łoju wołowego (4:6 w/w). Określano stabilność termooksydatywną triacylogliceroli wyizolowanych z poszczególnych surowców, z mieszaniny wyjściowej oraz z produktów enzymatycznego przeestryfikowania. Badano takie wyróżniki jak: okres indukcji -(met.DSC)-, zawartość frakcji polarnej -(met. chromatografii kolumnowej) i E%1cm...
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Rozdz. 4 Kształtowanie struktury przyrodniczo kulturowej. W: [Praca zbio-rowa] Materiały do monografii przyrodniczej regionu gdańskiego.Gdańsk: Mar- press**2002 s. 72-88 + zał. 1 mapa. Tom 8. Diagnoza stanu i koncepcja ochrony środowiska przyrodniczo-kulturo- wego w województwie pomorskim. Diagnosis of natural-cultural environment´s condition and the idea of its protction in Pomeranian Voivodship. Red. A. Kostarczyk, M. Przewoźniak.
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Self-assembled concentric stripes of diamond particles by a pinning-depinning mechanism
PublikacjaWe describe the novel mechanism of spontaneous formation of the concentric stripe patterns of microdiamonds via gradual solvent evaporation from a suspension confined in a teardrop well. The self-organized patterns exhibit a series of arcs with regular spacings varying between hundreds of micrometers and millimeters. They result from an interplay between the directional forced circulation of the solvent and a stick-slip movement...
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Determinants of the primary stability of cementless acetabular cup implants: A 3D finite element study
PublikacjaPrimary stability of cementless implants is crucial for the surgical success and long–term stability. However, primary stability is difficult to quantify in vivo and the biomechanical phenomena occurring during the press–fit insertion of an acetabular cup (AC) implant are still poorly understood. The aim of this study is to investigate the influence of the cortical and trabecular bone Young's moduli Ec and Et, the interference...
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The luminescence study of Sr2−xSrxPN3:Eu2+ nitridophosphate.
Dane BadawczeIn this work, a series of Ca2−xSrxPN3:Eu2+ nitridophosphate phosphors through a solid-solution strategy involving a hot isostatic press was developed by collaborators from National Taiwan University. Unexpected dual emissions in the red and infrared regions are observed, different from previous research results. The unique change in red and near-infrared...
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Unidirectional DC/DC Converter with Voltage Inverter for Fast Charging of Electric Vehicle Batteries
PublikacjaThe paper proposes the adaptation of the industrial plant’s power network to supply electric vehicle (EV) fast-charging converters (above 300 kW) using renewable energy sources (RESs). A 600 V DC microgrid was used to supply energy from RESs for the needs of variable speed motor drives and charging of EV batteries. It has been shown that it is possible to support the supply of drive voltage frequency converters (VFCs) and charging...
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The influence of the temperature treatment method on the quality of French fries.
Dane BadawczeThe video presents instructional work on the temperature treatment of French fries and the assessment of oil changes during frying. The results of the measurements show that placing the fries in cold oil, heating them to the frying temperature compared to the conventional method of frying, reduces the amount of primary oxidation products and free fatty...
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Jacek Krenz dr hab. inż. arch.
OsobyUr. 11 maja 1948 w Poznaniu – polski architekt, malarz, profesor Wydziału Architektury Politechniki Gdańskiej, Wydziału Architektury, Inżynierii i Sztuki Sopockiej Szkoły Wyższej, W latach 70. członek Grupy Kadyńskiej, skupiającej plastyków i architektów związanych z Międzynarodowymi Plenerami "Ceramika dla architektury" w Kadynach. W roku 1980 uzyskał stopień doktora, a w 1997 – doktora habilitowanego. Prowadzi badania na temat...
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XRD pattern of Mo2Ga2C, Mo2CTx/Mo2GaC and Ni-Mo2CTx/Mo2Ga2C materials
Dane BadawczeIn the dataset are included raw data for the preparation of XRD pattern of Mo2Ga2C, Mo2CTx/Mo2GaC and Ni-Mo2CTx/Mo2Ga2C materials.
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Intellectual brain drain and economic growth in developing countries: A theoretical solution of strategic compensation
PublikacjaBrain drain is a real problem for the developing countries like Pakistan. It not only impacts theworkforce, but its effect eventually translates to economic growth as well. The most severe form of braindrain is intellectual as top tier skilled employees’ move out of the country. This study explores the issue ofintellectual brain drain in Pakistan moreover analyzes its severity to the economic growth. Finally,...
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The effect of tyre rubber grinding method on the rubber-asphalt binder properties
PublikacjaRubber products, especially those used in the automotive industry, are responsible for a significant amount of waste, mainly in the form of worn tyres. One way to recycle tyres is to use them as an asphalt binder modifier. The properties of rubber-asphalt binders vary greatly depending on the morphology of the ground tyre rubber (GTR) grains and the type of tyre to be recycled (car/truck). The paper presents the results of research...
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Influence of reactive oxygen species during deposition of iron oxide films by high power impulse magnetron sputtering.
PublikacjaIron oxide films were deposited using high power impulse magnetron sputtering (HiPIMS) of an iron cathode in an argon/oxygen gas mixture at different gas pressures (0.5~Pa, 1.5~Pa, and 5.0~Pa). The HiPIMS system was operated at a repetition frequency $f = 100$~Hz with a duty cycle of 1~\%. A main goal is a comparison of film growth during conventional and electron cyclotron wave resonance-assisted HiPIMS. The deposition plasma...
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Comprehensive stabilization of all streams of solid residues formed during sewage sludge thermal treatment – Case study
PublikacjaModern wastewater treatment plants are currently struggling with the problem of processing and ecological management of sewage sludge. Thermal utilization is a frequently used practice of excess sludge utilization especially in large wastewater treatment plants, which seems to be a quite promising concept. However, during thermal treatment, fractions of ashes and dusts are generated. Such wastes, especially the dust fraction, can...
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Dynamics of cutting power during sawing with circular saw blades as an effect of wood properties changes in the cross section
PublikacjaIn the paper the effect of the method calculation upon the cutting power is presented. In computations were used models in which fracture toughness was incorporated. The comparison concerned models as follows: FM-CM – classic model in which the sum of all uncut chip thicknesses of the simultaneously teeth engaged represented the mean uncut chip thickness, FM-FDM – full dynamical model in which besides variable uncut chip thickness...
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Effects of different omeprazole dosing on gastric pH in non-variceal upper gastrointestinal bleeding: A randomized prospective study
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Integrated Processing: Quality Assurance Procedure of the Surface Layer of Machine Parts during the Manufacturing Step "Diamond Smoothing"
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Seasonal and habitat variation in the diet of the tawny owl (Strix aluco) in central Poland during unusually warm years
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Investigations into Exhaust Particulate Emissions from Multiple Vehicle Types Running on Two Chassis Dynamometer Driving Cycles
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Combining X-ray tomogrpahy imaging and DEM simulations to investigate granular material flow during silo discharging
PublikacjaEven after few decades of research, the study of particle motion taking place during silo discharging hasn’t been fully addressed, both experimentally and numerically, because of nontrivial behaviors that occur during associated flow patterns. For instance, discrete element method (DEM) has shown good qualitative prediction potential of velocity profile, but, on the other hand, frequently failed to match quantitatively experimental...
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The motion influence on respiration rate estimation from low-resolution thermal sequences during attention focusing tasks
PublikacjaGlobal aging has led to a growing expectancy for creating home-based platforms for indoor monitoring of elderly people. A motivation is to provide a non-intrusive technique, which does not require special activities of a patient but allows for remote monitoring of elderly people while assisting them with their daily activities. The goal of our study was to evaluate motion performed by a person focused on a specific task and check...
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The performance of H2O, R134a, SES36, ethanol, and HFE7100 two-phase closed thermosyphons for varying operating parameters and geometry
PublikacjaIn this study, the influences of different parameters at performance two-phase closed thermosiphon (TPCT) was presented. It has been confirmed that the working fluid, as well as operating parameters and fill ratio, are very important factors in the performance of TPCT. The article shows characteristics of gravitational tube geometr ies, as well as the technical characteristic of the most important system components, i.e., the evaporator/condenser....
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Optimization of clamping stiffness during milling of high-dimensional structures with the use of techniques of experiment – aided virtual prototyping
PublikacjaThe subject of this paper is a method of searching for conditions of minimizing the vibration level of a tool-high dimensional flexible workpiece, at unchangeable technological parameters of the machining process. It depends on repeatable change of the values of the stiffness coefficients as soon as an optimal vibration state of the workpiece approaches. There are assessed the values of dominant ”peaks” in the frequency spectra...
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Determination of probabilities defining safety of a sea-going ship during performance of a transportation task in stormy weather conditions
PublikacjaThe paper presents the possibility of applying the theory of semi-Markov processes to determine the limiting distribution for the process of changes of technical states being reliability states of the systems of sea-going ships significantly affecting safety of such ships, which include main engine, propeller and steering gear. The distribution concerns the probabilities of occurrence of the said states defined for a long time...
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The metagenomic approach to characterization of the microbial community shift during the long-term cultivation of anammox-enriched granular sludge
PublikacjaA metagenomic approach was used to investigate how the microbial community composition changes when an anammox-based granular sludge reactor is seeded with nitritation-anammox biomass from a wastewater treatment plant. In the seed sample, the abundance of Candidatus Kuenenia stuttgartiensis was similar to Candidatus Jettenia caeni (12.63 vs. 11.68%). This biomass was typical in terms of microbial nitrogen conversion; both ammonia...
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Effective configuration of a double triad planar parallel manipulator for precise positioning of heavy details during their assembling process
PublikacjaIn the paper, dynamics analysis of a parallel manipulator is presented. It is an atypical manipulator, devoted to help in assembling of heavy industrial constructions. Few atypical properties are required: small workspace; slow velocities; high loads. Initially, a short discussion about definition of the parallel manipulators is presented, as well as the sketch of the proposed structure. In parallel, some definitions, assumptions...
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Determination of time dependence of coated metal electrical and electrochemical parameters during exposure using principal component analysis
PublikacjaThe use of the principal component analysis (PCA) permits the complex and quantitative analysis of the time dependence of electrical and electrochemical parameters of coated metal obtained by fitting impedance data. So far, changes in electrical and electrochemical parameters during exposure were analyzed independently. In this way, some of the information contained in the relationship between changes in parameters over time are...
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Evaluation of structural change during fast transformation process of cross-linked NR into liquid NR by light pyrolysis
PublikacjaThe presence of cross-linked networks in rubber creates a tremendous problem for recycling and reusing of waste rubber. Fast transformation of cross-linked natural rubber (NR) into liquid natural rubber was carried out by light pyrolysis in temperature range from 240 to 300 °C in variable time (in range: 1–30 min). The transformation efficiency was evaluated by measuring the sol fraction and the cross-link density of the gel fraction....
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Study on metrological relations between instant tool displacements and surface roughness during precise ball end milling
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30‐Day morbidity and mortality of bariatric metabolic surgery in adolescence during the COVID‐19 pandemic – The GENEVA study
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Estimation of Minimum Uncut Chip Thickness during Precision and Micro-Machining Processes of Various Materials—A Critical Review
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The Impact of Operational Parameters on Polypropylene Membrane Performance during the Separation of Oily Saline Wastewaters by the Membrane Distillation Process
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Carboxymethyl Starch/Medium Chain Fatty Acid Compositions: Rheological Changes During Storage and Selected Film Properties
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Non-Targeted Metabolite Profiling Reveals Host Metabolomic Reprogramming during the Interaction of Black Pepper with Phytophthora capsici
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Analysis of mHealth research: mapping the relationship between mobile apps technology and healthcare during COVID-19 outbreak
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Increased Levels of Platelets and Endothelial-Derived Microparticles in Patients With Non-Valvular Atrial Fibrillation During Rivaroxaban Therapy
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Nondestructive Methodology for Identification of Local Discontinuities in Aluminide Layer-Coated MAR 247 during Its Fatigue Performance
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The Thermal State of the North Atlantic Ocean and Hydrological Droughts in the Warta River Catchment in Poland during 1951–2020
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Trace analyses of gaseous products formed during heat treatment of high stage H2SO4-GICs and expanded graphite
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Studies on localization and protein ligands of Galleria mellonella apolipophorin III during immune response against different pathogens
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Gas hold up and time dependent slurry viscosity during the the precipitation of fine grained silicon dioxide particles.
PublikacjaBadano zmiany stopnia zatrzymania gazu i lepkości zawiesiny podczas precypitacji dwutlenku krzemu z krzemianu sodowego za pomocą dwutlenku w reaktorze airlift z wewnętrzną cyrkulacją. Badano wpływ parametrów procesowych na akumulację mikropęcherzy w zawiesinie.