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Wyniki wyszukiwania dla: EXPERIMANTAL TESTS
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From Functional Requirements through Test Evaluation Design to Automatic Test Data Retrieval – a Concept for Testing of Software Dedicated for Hybrid Embedded Systems
PublikacjaFrom Functional Requirements through Test Evaluation Design to Automatic Test Data Retrieval – a Concept for Testing of Software Dedicated for Hybrid Embedded Systems
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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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Preliminary experimental research on stability of truss' joint with positive eccentricity
PublikacjaRecently, a very large interest in lightweight steel structures made from cold-formed sections has been noticeable. In the design practice, a large emphasis is put on rational shaping of both the thin-walled elements and constructions designed on them. The aim of this paper is to present the methodology for preparation of experimental research that model the behaviour of members in trusses made of cold-formed sections with positive...
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Experimental and numerical investigations for GPR evaluation of reinforced concrete footbridge
PublikacjaThe GPR method has increasingly found application in non-destructive testing of reinforced concrete structures. This paper presents the new approach of modelling of the electromagnetic wave propagation for reinforced concrete structures with a complex system of the reinforcement. Simulations of the GPR field were performed on a three-dimensional model of a footbridge using the FDTD method. Numerical maps were compared with results...
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Evaluating experimental molecular physics studies of radiation damage in DNA*
PublikacjaThe field of Atomic and Molecular Physics (AMP) is a mature field exploring the spectroscopy, excitation, ionisation of atoms and molecules in all three phases. Understanding of the spectroscopy and collisional dynamics of AMP has been fundamental to the development and application of quantum mechanics and is applied across a broad range of disparate disciplines including atmospheric sciences, astrochemistry, combustion and environmental...
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Experimental analysis of chip removing system in circular sawing machine
PublikacjaPaper presents analysis of the process of removing the wood chips generated during the cutting of the material on the circular sawing machine. The attention is focused on the upper cover of the chip removing system. Within the framework of the work a systematic experimental study of pressure distribution in the cover during operation of the selected rotational speed of saw blade with a diameter of 300 mm and 450 mm was carried...
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Positron scattering on molecular hydrogen: Analysis of experimental and theoretical uncertainties
PublikacjaExperiments performed in recent years on positron scattering from molecular hydrogen indicated a rise of the total cross section in the limit of zero energy, but essentially disagree on the amplitude of this rise. Mitroy and collaborators [J.-Y. Zhang et al., Phys. Rev. Lett. 103, 223202 (2009)] predicted a scattering length somewhat different from values deduced experimentally. Using a Markov chain Monte Carlo modified effective...
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Modulated photocurrents in amorphuous solids uner varius experimwntal conditions
PublikacjaPodobno przybliżone wzory opisujące modulowane fotoprądy mierzone w słaboprzewodzących próbkach o kanapkowym układzie elektrod. Pokazano wpływ zapełnienia pułapek, głębokości absorpcji światła i dyfuzji w próbce na teoretyczne przebiegi fotoprądów. Zamieszczono przykładowe krzywe fotoprądów, zmierzone w poli(N-winylokarbazolu) i otrzymane na ich podstawie energetyczne rozkłady gęstości pułapek dla dziur.
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Experimental and numerical identification of corrosion degradation of ageing structural components
PublikacjaThe study presents experimental and numerical identification of corrosion degradation of thin-walled structural components employing guided wave propagation. The steel structural components are subjected to through-thickness varying corrosion degradation levels. The developed approach using the non-destructive guided wave-propagation quantifies the equivalent average corrosion degradation level by exploring a limited number of...
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Experimental study of the multi-disc negative brake for a hydraulic motor
PublikacjaThis paper describes the methodology for experimental testing of a multi-disc brake. The construction of this brake was also present. The brake is dedicated to hydraulic motors with a small working volume. Experimental tests were carried out on a brake with plates immersed in oil and, for comparison, tests were carried out on a dry brake. As a result of the tests, the permissible torque (load) that is able to transfer the brake...
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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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Experimental study on earthquake-induced pounding between steel structures
PublikacjaPounding between adjacent structures has been repeatedly observed during major earthquakes. The phenomenon may cause some local damage at the points of interactions, it may also lead to substantial destruction, permanent deformations or total collapse of colliding structures. The effects of earthquake-induced structural pounding have been studied for more than three decades now. However, most of the studies concerned masonry as...
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Polyacrylamide‐based phantoms as tissue substitute in experimental radiation physics
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Experimental Study on Polymer Mass Used to Repair Damaged Structures
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Experimental and numerical studies of double corrugated steel arch panels
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Experimental study and numerical calculations in the analysis of thin-walled structures
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Adjuvant, neoadjuvant, and experimental regimens in overcoming pancreatic ductal adenocarcinoma
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Experimental Comparison of Designed Inductance Coils for Wireless Power Transfer
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Crack identification using wavelets on experimental static deflection profiles
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Negative psychological aspects of working with experimental animals in scientific research
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Experimental Validation of the Chemical Recycling of Crystalline Silicon Solar Cells
PublikacjaW ostatnich latach systemy fotowoltaiczne stają się bardzo popularne na całym świecie jako korzystne dla środowiska rozwiązanie problemów energetycznych. Zagadnienie zagospodarowania zużytych elementów systemów fotowoltaicznych, których ilość w przyszłości może być znaczna, nie zostało do tej pory opracowane. Konieczne jest znalezienie optymalnej metody recyklingu i ponownego wykorzystania wycofanych z użycia elementów składowych...
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Experimental and theoretical study of surface cooling using a single microjet
PublikacjaPrzedstawiono wyniki badań eksperymentalnych intensyfikacji wymiany ciepła przy pomocy pojedynczych strug wody i powietrza.Uzyskana na podstawie wyników korelacja, opisująca współczynnik przejmowania ciepła, posłużyła do weryfikacji modelu opracowanego wcześniej przez Mikielewicza (2007).
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Experimental study of the variations of the freezing points of ionic liquids in water
PublikacjaTemperatura zamarzania czystych soli alkiloimidazoliowych zawiera się w przedziale od - 70ºC do - 90ºC zależnie od długości podstawinika alkilowego oraz od rodzaju anionu. Celem niniejszej pracy jest znalezienie odpowiedniej metody pomiaru zmian temperatury zamarzania chlorku 1-metylo-3-oktyloimidazolu w wodzie. Wynik przeprowadzonych badań pozwolił na sporządzenie fragmentu diagramu fazowego dla wodnego roztworu chlorku...
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Comparison of experimental and numerical results on metallic plates subjected to explosions
PublikacjaA comparative study of dynamic response including damage and rupture processes of thin metallic plates subjected to shockwave impulses - explosions is presented. The results of the finite element numerical analysis are related to experiments. Due to high strain rate during explosions the elasto-viscoplastic Chaboches constitutive law including damage effects has been applied. For the assumed model proper material parameters identification...
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Numerical modelling and experimental verification of compressible squeeze film pressure
PublikacjaThe validity of using the Reynolds equation for compressible squeeze film pressure was tested with computational fluid dynamics (CFD). A squeeze film air bearing was instrumented with pressure sensors and non-contacting displacement probes to provide transient measurements of film thickness and pressure. The film thickness measurements also provided input parameters to the numerical prediction. However, numerical results showed...
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Improvement of damage detection methods based on experimental modal parameters
PublikacjaW pracy przedstwiono sposoby porawy czułości metod detekcji uszkodzeń wykorzystujacych eksperyentalne parametry modalne konstrukcji. Wykazano, że zastosowanie zawansowanych technik obróbki sygnałów pomiarowych pozwala zdecydowanie poprwaić skutecznośc znanych z literatury metod.
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Dependence of bimolecular recombination rate constant on different experimental parameters
PublikacjaZ otrzymanych wzorów analitycznych oraz przeprowadzonych obliczeń numerycznych wynika, że dla wysokich natężeń pola elektrycznego stała szybkości rekombinacji bimolekularnej jest funkcją zewnętrznego pola elektrycznego oraz koncentracji nośników ładunku. Szczególnie interesujący jest wynik dotyczący obniżania się stałej szybkości rekombinacji wraz ze wzrostem natężenia pola elektrycznego, który różni się zupełnie od przewidywań...
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Experimental investigations of DAC Systems operating in VAV Control mode
PublikacjaPraca przedstawia techniczne aspekty wykorzystania ciepła sieciowego w bezsprężarkowych, adsorpcyjnych systemach klimatyzacyjnych na przykładzie zrealizowanej instalacji w EC Gdansk.Zaprezentowano również stanowisko oraz wyniki badań eksperymentalnych doyczących wpływu zmian parametrów przepływowych powietrza wilgotnego na efektywność pracy regeneratorów ciepła.
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Selected problems of experimental investigation of dynamically loaded journal bearings
PublikacjaIn the paper some problems concerning relations between external bearing loadings and critical lining stresses are described for test stand with rotating load vector. According to the standard ISO 7905/1 this type of test stand, for dynamically loaded slide bearing, is recommended as a basic research unit for material testing in a complete bearing unit. The lining stress calculation results occurred being dependent on applied calculation...
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Experimental research of the stability of steel cylindricalshell subjected to circumferential compression
PublikacjaAt the Department of Metal Structures Gdańsk University of Technology, experiments have been performed on the stability of shell of steel cylindrical models. The experiments have been carried on a test bench built at the Department. The design based on other test benches which were created in the past by other scientists, where modernized by the courtesy of companies that offer modern solutions. The test bench enables to generate...
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Phase Transitions in Pores: Experimental and Simulation Studies of Melting and Freezing
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An Experimental Study of Scenarios for the Agent-Based RBF Network Design
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Shaking table experimental study on structural pounding during earthquakes
PublikacjaArtykuł przedstawia wyniki badań eksperymentalnych przeprowadzonych na stole wstrząsowym dotyczące zachowania się kolidujących ze sobą modeli konstrukcji podczas trzęsień ziemi. Wyniki te pokazują, iż zderzenia mogą prowadzić do znacznego wzrostu odpowiedzi konstrukcji, ale mogą mieć również pozytywny wpływ i częściowo wytłumić drgania. Ponadto, wyniki badań wskazują na istotny wpływ rodzaju materiału, z którego wykonane są elementy...
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Experimental investigation of Organic Rankine Cycles for domestic micro CHP
PublikacjaW artykule przedstawiono wyniki badań eksperymentalnych obiegu ORC wyposażonego w ekspander typu scroll (I etap badań) oraz ekspander utworzony na bazie turbinki pneumatycznej (II etap badań). Raportowane badania przeprowadzono na laboratoryjnym stanowisku realizującym obieg ''domowej'' mikrosiłowni parowej.
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Experimental and Theoretical Screening for Green Solvents Improving Sulfamethizole Solubility
PublikacjaSolubility enhancement of poorly soluble active pharmaceutical ingredients is of crucial importance for drug development and processing. Extensive experimental screening is limited due to the vast number of potential solvent combinations. Hence, theoretical models can offer valuable hints for guiding experiments aimed at providing solubility data. In this paper, we explore the possibility of applying quantum-chemistry-derived...
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EXPERIMENTAL ANALYSIS OF RUBBER AND STYROFOAM BUMPERS INFLUENCE ON THE COLLIDING STRUCTURES
PublikacjaPast and recent investigations of colliding structures under seismic excitation confirmed that pounding may have a significant influence on the structural response. Interactions between adjacent buildings may cause serious damage to the structures, leading even to its total collapse. The main reason of earthquake-induced pounding, besides insufficient distance between structures, are differences in stiffness or mass of colliding structures....
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Experimental study on effectiveness of polymer dampers in reduction of structural vibrations
PublikacjaVibrations of civil engineering structures, generated by dynamic loads, may be very dangerous to the structures themselves as well as may have significant influence on human perception and comfort. A number of different methods have been proposed in order to minimize such situations. This concern newly designed structures as well as those which dynamic properties have to be modified due to problems with excessive vibrations. One...
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The experimental research on RC columns, loaded at sign-variable eccentricity
PublikacjaThe research focuses on testing the behaviour of the reinforced concrete columns compressed at a variable eccentricity. The fact of possible variable eccentricity in compressed columns is not considered in the current calculation procedures. The objective of the research was to examine whether indeed the load history has no impact and whether the reinforced concrete columns compressed at eccentric of variable sign could be analysed...
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EXPERIMENTAL STUDY OF A TEMPORARY STEEL GRANDSTAND UNDER CROWD LOAD
PublikacjaTemporary structures, such as grandstands, are commonly used during different types of mass events, especially sport and music concerts. In this paper, the results of the experimental study on temporary steel grandstand are presented. The aim of the investigation was to determine modal characteristics of such structures. Modes of free vibrations and corresponding natural frequencies have been obtained for empty and occupied grandstand....
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Experimental investigation into surface texture effect on journal bearings performance
PublikacjaThe aim of this study was to analyse the performance of journal bearings with specially created dimples on the sliding surface and operating under various conditions. The texture was created on the bearing surface that co-acted with the smooth journal; moreover, the variation of the textured surface of the journal mating with the smooth bearing was tested, and the results were compared to those obtained with the standard smooth...
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Experimental research on marine oil-lubricated stern tube bearing
PublikacjaBearings of propeller shafts are very crucial elements of the propulsion system of each of the ships. The safety of shipping depends on their durability and reliability. The new legal restrictions mean that today we are looking for environmentally friendly solutions. That is why water-lubricated bearings are becoming more and more popular. So, will oil-lubricated shaft bearings belong to the past? The bearing with a white metal...
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Selected Problems of Experimental Testing Marine Stern Tube Bearings
PublikacjaThis paper presents typical methods for conducting experimental tests on main shaft slide bearings. There are described their possible testing capabilities, advantages, drawbacks and limitations. Various testing methods were analyzed to find a solution able of providing a wide range of possible investigations at possibly acceptable limitations.
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DEVELOPMENT OF A COUPLED NUMERICAL AND EXPERIMENTAL APPROACH TO HYDRODYNAMIC NOISE ESTIMATION
PublikacjaThe hydroacoustic signature of ships' propellers can be estimated experimentally through measurements of cavitation-induced pressure fluctuations and the corresponding noise distributions at model scale. These measurements need to be performed in a cavitation tunnel under the propellers operating conditions and are quite sensitive and challenging to perform with sufficient accuracy. In comparison, the numerical approach can be...
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Influence of operation of national experimental nuclear reactor on the natural environment
PublikacjaThis paper presents the impact of experimental nuclear reactor operations on the national environment, based on assessment reports of the radiological protection of active nuclear technology sources. Using the analysis of measurements carried out in the last 15 years, the trends are presented in selected elements of the environment on the Świerk Nuclear Centre site and its surroundings. In addition, the impact of research results...
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Recent progress in experimental studies of electrohydrodynamic flow in electrostatic precipitators
PublikacjaMany experimental, theoretical and numerical works were devoted to the electrohydrodynamic (EHD) flow generated in electrostatic precipitators (EPSs). The generally accepted conclusion from these studies is that the EHD flow plays an important role in the particle collection in ESPs. However, despite of the recent fast progress in numerical simulation and experimental techniques used in the ESPs studies many problems related to...
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Experimental research on technical fabric of the Forest Opera Roof in Sopot
PublikacjaThe experimental analysis of the technical fabric Valmex is presented. The study involves uniaxial tensile, cyclic, rheological and biaxial tests. Some of the main differencies between two types of the analysed material have been identified. Mechanical properties of the textile have been modeled by the viscoelastic standard model with quite good effect.
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Experimental study on ultrasonic monitoring of splitting failure in reinforced concrete
PublikacjaThis paper investigates inspection of reinforced concrete elements sensitive to the splitting failure. The behaviour of a reinforced concrete specimen subjected to a tensile stress is considered. The damage detection procedure is based on the ultrasonic wave propagation technique. The piezoelectric transducers are located on both ends of the specimen and the measurements are taken periodically during the incrementally increased...
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Experimental Investigation of Prototype Water-Lubricated Compliant Foil Bearings
PublikacjaPraca zawiera wyniki badań doświadczalnych prototypowego łożyska foliowego smarowanego wodą. Łożyska tego typu mogą mieć zastosowanie w węzłach, od których wymaga się ekologicznego środka smarowego, np. pompy wodne czy turbiny wodne. W opracowaniu zademonstrowano wyniki badań trzech prototypowych poprzecznych łożysk foliowych. Opisano napotkane problemy badań oraz wprowadzonych do konstrukcji łożyska zmian, których celem była poprawa...
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Experimental Extraction of Secure Correlations from a Noisy Private State
PublikacjaWe report experimental generation of a noisy entangled four-photon state that exhibits a separation between the secure key contents and distillable entanglement, a hallmark feature of the recently established quantum theory of private states. The privacy analysis, based on the full tomographic reconstruction of the prepared state, is utilized in a proof-of-principle key generation. The inferiority of distillation-based strategies...