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Wyniki wyszukiwania dla: experimental modal analysis
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Experimental and numerical identification of separation zones in the cent-rifugal compressor
PublikacjaW pracy przedstawiono analizę przepływu w obszarze koła wirnikowego oraz dyfuzora bezłopatkowego sprężarki powietrza. Wyniki obliczeń w ramach modelu 3D (FLUENT 5.5) porównano z wynikami badań laboratoryjnych na stanowisku sprężarkowym Katedry Sprężarek w Sankt Petersburgu. Celem porównania jest ocena możliwości identyfikacji stref przepływu z oderwaniem, w ramach modeli dostępnych w wykorzystanym programie obliczeniowym. W wyniku...
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Direct reduction of pellets through hydrogen: Experimental and model behaviour
PublikacjaThis paper presents the hydrogen reduction behaviour of industrial pellets designed for the efficient hydrogen based direct reduction. The pellets were provided with very low non ferrous oxides percentage (0.52 of basicity index) and with the absence on TiO2 oxides. The pellets measured diameters in the range 1.14–1.72 cm and were characterized in terms of porosity, pores size, tortuosity and compression strength. The pellets were...
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Experimental Verification of the CFD Model of the Squeeze Film Lifting Effect
PublikacjaAbstract: The presented study shows the results of the research into the squeeze film levitation phenomena. The system introduced in the investigation is composed of a vibrating surface, air squeeze film, and the surface of the body freely suspended over the film. The use of the CFD (Computational Fluid Dynamics) model used in the system allows us to determine the steady state, periodic behavior of the air film (described by Navier–Stokes,...
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Methodology of experimental research on efficiency of hydro-mechanical automatic gearbox
PublikacjaThe article shortly describes the design and principle of operation of the hydromechanical gearbox and presents the methodology and design of test stands used for testing hydromechanical proto-type gearbox developed at Technical University of Gdansk. The article presents an approach according to which, in order to obtain reliable measurement data, it is necessary to separate the tests of the hydraulic and mechanical parts of the...
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Experimental research of the effect of face milling strategy on the flatness deviations
PublikacjaIn this paper the dependencies between face milling strategy of EN AW6082-T6 aluminum alloy samples, with difference thicknesses (6, 8, and 12 mm) and two cold rolling directions, and flatness deviations were presented. Three strategies of milling included different proportions of material removed from both sides of the plates. This approach allowed to control the proportions of residual surface stresses on both sides of the specimens,...
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Time-frequency characteristics of chemical oscillations. Experimental and model studies.
PublikacjaW publikacji zaprezentowano wykorzystanie czasowo-częstotliwościowych metod analizy sygnałów niestacjonarnych do badania reakcji Biełousowa-Żabotyńskiego. Zastosowanie krótkoczasowej transformaty Fouriera (STFT) pozwoliło na uzyskanie spektrogramów przedstawiających zmiany energii i częstotliwości oscylacji w trakcie trwania reakcji chemicznej. Przedyskutowano podobieństwa i różnice pomiędzy spektrogramami wygenerowanych dla eksperymentalnych...
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Theoretical and experimental treatment of a microstrip coupled ferrite line circulator.
PublikacjaArtykuł opisuje wyniki badań teoretycznych i eksperymentalnych cyrkulatora realizowanego w technice sprzężonych ferrytowych linii mikropaskowych. W stosunku do wcześniejszych metod zastosowano do realizacji układu strukturę linii mikropaskowych w których ferryt położony jest na górze mikropaska. Struktura umożliwiła zmniejszenie strat układu w stosunku do wcześniej przyjętych technologii.
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Nucleate pool boiling modelling and experimental investigation : chapter 7
PublikacjaOmówiono wpływ powłoki porowatej nanoszonej na całą powierzchnię rurki lub jej fragment na osiągany współczynnik przejmowania ciepła, krytyczne gęstości strumienia ciepła, a także obwodowy rozkład temperatury przy wrzeniu pęcherzykowym na zewnętrznej powierzchni poziomej rurki.Przedstawiono wyniki badań częstotliwości odrywania się pęcherzyków oraz pól prędkości wokół wzrastającyh i unoszących się pęcherzyków przy wrzeniu z pojedynczych...
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The experimental method of reducing magnetic field intensity in industrial buidings
PublikacjaPrzedstawiono metodę obniżenia poziomu intensywności zakłóceń w budynkach pracującego zakładu przemysłowego. Potrzeba wykonania badań pola elektromagnetycznego wynikała m.in. z zaobserwowanej wśród pracowników jednego z działów zakładu większej podatności na zachorowania. Na drodze pomiarów zlokalizowano źródła silnego pola magnetycznego w zakresie małych częstotliwości. Na podstawie analizy wyników pomiarowych sformułowano wnioski...
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Experimental comparison of UML-HAZOP inspection and non-structured review
PublikacjaArtykuł przedstawia eksperyment przeprowadzony na Politechnice Gdańskiej mający na celu porównanie dwóch technik przeglądowych. Poszczególne rozdziały zawierają: ogólne omówienie tematyki przeglądów i inspekcji, przedstawienie metody UML-HAZOP, opis przebiegu eksperymentu oraz uzyskanych rezultatów.
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Experimental and theoretical investigations of silo music during granular flow
PublikacjaPraca dotyczy analizy efektów dynamicznych w silosach podczas przeływu materiałów sypkich.
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Experimental and theoretical studies of resonance effects during silo flow.
PublikacjaPrzedstawiono badania nad rezonansowymi efektami dynamicznymi podczas przepływów silosowych. Wpływ rezonansu na wielkość naporu był analizowany przy pomocy badań doświadczalnych i obliczeń MES na bazie prawa mikropolarnego sprężysto-plastycznego. Doświadczenia wykonano w silosie o przekroju okrągłym i prostokątnym. Zaproponowano efektywną metodę redukcji efektów dynamicznych.
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Instrumental techniques used in the analysis of exhaled air
PublikacjaExhaled air composition changes depending on the health status of the patient, making it possible to use breath analysis for diagnosis and monitoring purposes. Despite the fact that it is not yet used in every day medical practice, it potential application could facilitate the diagnostics of various diseases such as metabolic disorders, respiratory tract and gastrointestinal diseases. Described in this paper are different application...
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The experimental results of diesel fuel spray with marine engine injector
Dane BadawczeThe data set presents the measurement of the diesel fuel spray from with marine engine injector. The main target presents results is a study of the time course of macro parameters (spray tip penetration, spray cone angle) of fuel spray in the cylinder of marine diesel engine. The impact of ambient conditions and the geometrical parameters of the injector...
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Dynamics analysis of footbridge mode shapes the s8 expressway on the basis of the results of in situ tests
PublikacjaNon-destructive diagnostics for structure may use dynamic measurements realized during vibrations of a facility induced by dynamic environmental impact, enforced by the use of inductors or impulse impact. Dynamic tests and the analysis were undertaken for a footbridge situated over the expressway S8. The studies in situ allowed for dynamic characteristics to be determined: frequency, shape modes and damping for respective frequency...
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Storing Matter’technique in SIMS depth profile analysis
PublikacjaSecondary ion mass spectrometry (SIMS) is a very useful technique for the analysis of layered systems. It is based on the primary ion beam sputtering of solids and mass analysis of the emitted secondary ions. A main limitation of this technique results from the direct quantitative analysis, since the ionization efficiency of a given atom is highly influenced by the neighbouring atoms at the surface. This phenomenon is known as...
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Selected aspects of the evolution of the industry analysis
PublikacjaPorter's five forces is a significant tool of analysis of industries. It helps evaluating variables of industry profitability and assessing firm performance. Using the framework, managers can take a decision as to which industries they can effectively compete in and position their companies to reduce the adverse effects of the mentioned forces. According to the critics, the five forces model is limited to its static nature. The...
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Automatic Analysis of Trajectories of Moving Objects
PublikacjaOngoing monitoring is essential to providing security and safety of maritime and air operations. This paper presents the research in the area of automatic analysis of movement of unrestricted vehicles like ships and air-planes. The analysis is aimed at extraction of trajectory information, and the results can be used to identify anomalous behaviour in archived and real-time data. In this paper we focus on data acquired using the...
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H2O˙+ and OH+ reactivity versus furan: experimental low energy absolute cross sections for modeling radiation damage
PublikacjaRadiotherapy is one of the most widespread and efficient strategies to fight malignant tumors. Despite its broad application, the mechanisms of radiation-DNA interaction are still under investigation. Theoretical models to predict the effects of a particular delivered dose are still in their infancy due to the difficulty of simulating a real cell environment, as well as the inclusion of a large variety of secondary processes. This...
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Analysis of the possibility of creep damage detection in T24 heat resistant steel with the help of magnetic nondestestructive testing methods
PublikacjaThe paper presents the result of an analysis of applicability of various electromagnetic methods of nondestructive evaluation for creep damage detection in a novel heat resistant steel - T24 grade. Two sample sets, cut out from membrane wall tubes, were investigated – the as-delivered one and another exploited for 36,000 h in a power plant. There are described results of magnetic hysteresis loops B(H), Barkhausen noise (BN) and...
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New concept and analysis of the multicell piezoelectric motor
PublikacjaThis work presents the design, modeling and tests of the prototype multicell piezoelectric motor (MPM). A new concept of the electromechanical structure of the considered prototype is based on three rotating-mode actuators. The electromechanical structure of each actuator has been considered as an independent one - referred to as a ”single cell” (single actuator). Combined three resonant actuators generate three traveling waves...
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Analysis of human behavioral patterns
PublikacjaWidespread usage of Internet and mobile devices entailed growing requirements concerning security which in turn brought about development of biometric methods. However, a specially designed biometric system may infer more about users than just verifying their identity. Proper analysis of users’ characteristics may also tell much about their skills, preferences, feelings. This chapter presents biometric methods applied in several...
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Performance analysis of an rfid-based 3d indoor positioning system combining scene analysis and neural network methods
PublikacjaThe main purpose of this research is to improve localization accuracy of an active Radio Frequency Identification, RFID tag, in 3D indoor space. The paper presents a new RFID based 3D Indoor Positioning System which shows performance improvement. The proposed positioning system combines two methods: the Scene Analysis technique and Artificial Neural Network. The results of both simulation using Log-Distance Path Loss Model and...
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Experimental and numerical investigation on shell and coil storage unit with biodegradable PCM for modular thermal battery applications
PublikacjaThermal energy storage (TES) in automotive applications is currently growing in importance. TES can visibly reduce primary energy consumptions, decrease CO2 emission, and improve thermal comfort in electric as well as hybrid vehicles. However, to meet the new ambitious target (15% reduction of CO2 emissions in the new cars until 2025) it is required to use plug-in electric vehicles. For this reason, this paper focuses on the optimization...
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Towards application of uncertainty quantification procedure combined with experimental procedure for assessment of the accuracy of the DEM approach dedicated for granular flow modeling
PublikacjaThere is a high demand for accurate and fast numerical models for dense granular flows found in many industrial applications. Nevertheless, before numerical model can be used its need to be always validated against experimental data. During the validation, it is important to consider how the measurement data sets, as well as the numerical models, are affected by errors and uncertainties. In this study, the uncertainty quantification...
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SEMANTIC ANALYSIS ALGORITHMS FOR KNOWLEDGE WORKERS SUPPORT
PublikacjaThe paper examines various aspects of text analysis application for knowledge worker’s activity realization. Conclusions are drawn about the relevance and importance of processing the non-structured textual information in order to increase knowledge worker’s efficiency, as well as their awareness in different branches of science. The paper considers the existing algorithms of texts semantic analysis as the sphere of documents topical...
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Dynamic mechanical thermal analysis of polyamide 6/thermoplastic polyurethane blends
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Photoresponsive Amide-Based Derivatives of Azobenzene-4,4′-Dicarboxylic Acid—Experimental and Theoretical Studies
PublikacjaAzobenzene derivatives are one of the most important molecular switches for biological and material science applications. Although these systems represent a well-known group of compounds, there remains a need to identify the factors influencing their photochemical properties in order to design azobenzene-based technologies in a rational way. In this contribution, we describe the synthesis and characterization of two novel amides...
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Thermal properties. DSC analysis of poly(xylitol sebacate-co-butylene sebacate) PXBS.
Dane BadawczeIn this work, a bio-based copolyester with good mechanical properties was synthesized andcharacterized in terms of structure, main properties and biodegradability Determining the chemicalstructure of such materials is important to understand their behavior and properties. Performingan extraction of insoluble cross-linked polymer using di erent solvents...
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Thermal stability analysis of poly(lactic acid)-carbon black-nanodiamond composite
Dane BadawczeThis dataset contains thermal stability tests carried out on new 3D printing-dedicated composites with poly-lactic acid (PLA), carbon black (CB) and nanodiamond fillers. Two types of nanodiamonds were studied: detonation nanodiamonds (DND) and boron-doped carbon nanowalls (BCNW). The investigated techniques include: thermogravimetric analysis (TGA)...
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Corrosion monitoring by harmonic analysis in aqueous environments
PublikacjaThis paper presents tests concerning the rate of corrosion in non-alloy steel (type S235JR) in an aqueous environment, with an additive of sodium chloride by means of polarization resistance measurements and harmonic analysis. The tests have been carried out for steel samples exposed to the testing environment for six weeks, in order to obtain a constant rate of corrosion in the function of time. The measurements have aimed at...
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The use of Markov chains in the social convergence analysis
PublikacjaThe main goal of this article is to analyze the social convergence process using Markov chains. In this research, term social convergence refers to the reduction of dispersion in the standard of living among countries. The use of Markov chains in the social convergence analysis allowed describing movements of observational units within the distribution and providing more details about the mechanism of the convergence process. A...
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Values and problems analysis – Gdańsk-Lower City (Dolne Miasto) district case study, study proposal no 1, March 2021
Dane BadawczeThe data presents results of work within the studies of the development possibilities of the district in the context of the city, Gdańsk-Lower City (Dolne Miasto) district, study proposal no 1, from March 2021. The goal of the research process was to present the values and problems analysis of the area located in Gdańsk-Lower City (Dolne Miasto) district...
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Values and problems analysis – Gdańsk-Lower City (Dolne Miasto) district case study, study proposal no 3, March 2021
Dane BadawczeThe data presents results of work within the studies of the development possibilities of the district in the context of the city, Gdańsk-Lower City (Dolne Miasto) district, study proposal no 3, from March 2021. The goal of the research process was to present the values and problems analysis of the area located in Gdańsk-Lower City (Dolne Miasto) district...
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Values and problems analysis – Gdańsk-Lower City (Dolne Miasto) district case study, study proposal no 2, March 2021
Dane BadawczeThe data presents results of work within the studies of the development possibilities of the district in the context of the city, Gdańsk-Lower City (Dolne Miasto) district, study proposal no 2, from March 2021. The goal of the research process was to present the values and problems analysis of the area located in Gdańsk-Lower City (Dolne Miasto) district...
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Integrated Experimental and Theoretical Approach for Efficient Design and Synthesis of Gold-Based Double Halide Perovskites
PublikacjaApplied cutting-edge electronic structure and phonon simulations provide a reliable knowledge about the stability of perovskite structures and their electronic properties, which are crucial for design of effective nanomaterials. Gold is one of the exceptional elements, which can exist both as a monovalent and a trivalent ion in the B site of a double perovskite such as A2BI BIIIX6. However, until now, electronic properties of Cs2AuI AuIIIX6...
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Advances in Data Analysis and Classification
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COMPUTATIONAL STATISTICS & DATA ANALYSIS
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Complex Analysis and Operator Theory
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COMMUNICATIONS ON PURE AND APPLIED ANALYSIS
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AStA-Advances in Statistical Analysis
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Banach Journal of Mathematical Analysis
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International Journal of Pharmaceuticals Analysis
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Journal of Failure Analysis and Prevention
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Journal of Nonlinear Functional Analysis
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Applied Spatial Analysis and Policy
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EDUCATIONAL EVALUATION AND POLICY ANALYSIS
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Statistical Analysis and Data Mining
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Journal of Comparative Policy Analysis
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FUNCTIONAL ANALYSIS AND ITS APPLICATIONS
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