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Wyniki wyszukiwania dla: STACJE ELEKTROENERGETYCZNE
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Improvement of the thrust bearing calculation considering the convectional heating within the space between the pads
PublikacjaA modern thrust bearing calculation tool should consider not only the oil film between pad and rotating collar but also the space between the pads. The oil flow in the space has a significant influence on the oil film inlet temperature, the convectional cooling of pad and collar and should be included in the bearing calculation methods. The authors use a tool developed at Clausthal University of Technology in cooperation with the...
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Multi-state vibronic interactions in the fluorobenzene radical cation: The importance of quadratic coupling terms
PublikacjaThe multi-mode multi-state vibronic interactions in the set of X^2B_1 - D^2A_1 electronic states of the monofluoro benzene radical cation are investigated theoretically, based on a quadratic vibronic coupling approach. The underlying ionization potentials and coupling constants are obtained from ab initio coupled-cluster calculations. Previous investigations (relying on the linear coupling approach) are extended by including all...
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State of the art in the field of emission reduction of sulphur dioxide produced during coal combustion
PublikacjaThe need for clean coal technologies to reduce the adverse environmental impact of coal combustion products has been grounded. The article deals with information concerning present and future technologies, directed towards the struggle against air pollution by SO2, produced during coal combustion. Their classification and critical rating from economical and technological points of views (including those developed by authors) have...
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Effect of slag coal ash and foamed glass on the mechanical properties of two-stage concrete
PublikacjaTwo-stage concrete (TSC) is known by various names such as colcrete, Polcrete, preplaced aggregate concrete and prepacked concrete. It is different from traditional concrete in two fundamental ways, namely method of construction and mix proportion. Two-stage concrete (TSC) is defined as firstly, coarse aggregates are placed into the formwork and grout is applied to fill in the between coarse aggregate particles voids. Secondly,...
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Hybridized Space-Vector Pulsewidth Modulation for Multiphase Two-Level Voltage Source Inverter
PublikacjaIn space vector pulsewidth modulation (SVPWM) algorithms for multiphase two-level voltage source inverters (VSI), the components of active vectors in all orthogonal spaces have to be calculated within the processor and stored in its memory. These necessitate intensive computational efforts of the processor and large memory space. This article presents a hybridized SVPWM for multiphase two-level VSI. In this algorithm, elements...
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Photolysis for the Removal and Transformation of Pesticide Residues During Food Processing: A State-of-the-Art Minireview
PublikacjaPesticide residues are of great significant issue that exerted adverse effects on humans. There is a need for effective and non-toxic decontamination of pesticide residues during food processing. In this minireview, the recent advances in the degradation of pesticide residues by photolysis have been firstly described during food processing. The mechanisms of pesticide residues destruction by photolysis were discussed accordingly....
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Effects of full displacement pile installation on the stress and deformation state of surrounding soil: review
PublikacjaSeveral field and model tests have been conducted to investigate the impact of pile installation on bearing capacity. However, little is known about how piles behave during installation, how they interact with the surrounding soil, and how this affects sandy soil properties. This review paper investigates the effect of pile driving on surrounding sandy soil as it compacts sandy soil near to the pile. For this purpose, various related...
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Anti-plane shear waves in an elastic strip rigidly attached to an elastic half-space
PublikacjaWe consider the anti-plane shear waves in a domain consisting of an infinite layer with a thin coating lying on an elastic half-space. The elastic properties of the coating, layer, and half-space are assumed to be different. On the free upper surface we assume the compatibility condition within the Gurtin–Murdoch surface elasticity, whereas at the plane interface we consider perfect contact. For this problem there exist two possible...
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Dynamic fracture of brittle shells in a space-time adaptive isogeometric phase field framework
PublikacjaPhase field models for fracture prediction gained popularity as the formulation does not require the specification of ad-hoc criteria and no discontinuities are inserted in the body. This work focuses on dynamic crack evolution of brittle shell structures considering large deformations. The energy contributions from in-plane and out-of-plane deformations are separately split into tensile and compressive components and the resulting...
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State of the Art in Open Platforms for Collaborative Urban Design and Sharing of Resources in Districts and Cities
PublikacjaThis work discusses recent developments in sharing economy concepts and collaborative co-design technology platforms applied in districts and cities. These developments are being driven both by new technological advances and by increased environmental awareness. The paper begins by outlining the state of the art in smart technology platforms for collaborative urban design, highlighting a number of recent examples. The case of peer-to-peer...
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Improvement of Thrust Bearing Calculation Considering the Convectional Heating within the Space between the Pads
PublikacjaA modern thrust bearing tool is used to estimate the behavior of tilting pad thrust bearings not only in the oil film between pad and rotating collar, but also in the space between the pads. The oil flow in the space significantly influences the oil film inlet temperature and the heating of pad and collar. For that reason, it is necessary to define an oil mixing model for the space between the pads. In the bearing tool, the solutions...
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“Space & Satellite Technologies" intercollegiate master-degree courses of study in Tri-City (Poland)
PublikacjaSince summer semester of the academic year 2016/2017, two faculties of Gdansk University of Technology GUT (Faculty of Mechanical Engineering and Faculty of Electronics, Telecommunications and Informatics) together with the Gdynia Maritime University (Faculty of Electronics) and the Polish Naval Academy in Gdynia (Faculty of Command and Naval Operations) have opened intercollegiate master -...
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A new model of fuel spray shape at early stage of injection in a marine Diesel engine
PublikacjaIn the cylinders of a marine diesel engine, self-ignition occurs in very shortly time after the fuel injection into the combustion chamber. Therefore, the paper present was to develop a model of diesel fuel spray for the early stage of fuel spray for in marine diesel engine. There were taken into consideration the main aspects technical such as nozzle diameter of marine engine injector and backpressure in combustion chamber. In...
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Design and computational fluid dynamics analysis of the last stage of innovative gas-steam turbine
PublikacjaResearch regarding blade design and analysis of flow has been attracting interest for over a century. Meanwhile new concepts and design approaches were created and improved. Advancements in information technologies allowed to introduce computational fluid dynamics and computational flow mechanics. Currently a combination of mentioned methods is used for the design of turbine blades. These methods enabled us to improve flow efficiency...
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An adaptive-noise Augmented Kalman Filter approach for input-state estimation in structural dynamics
PublikacjaThe establishment of a Digital Twin of an operating engineered system can increase the potency of Structural Health Monitoring (SHM) tools, which are then bestowed with enhanced predictive capabilities. This is particularly relevant for wind energy infrastructures, where the definition of remaining useful life is a main driver for assessing the efficacy of these systems. In order to ensure a proper representation of the physical...
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Engineering and Management of Space Systems (EMSS) - an international joint Master's double-degree program
PublikacjaDynamic development of the space sector of European, and especially of Polish and German economies results in a necessity for suitable Higher Education Institution graduates. The increasing digitization, distribution and networking of technical systems leads to the necessity of a degree programme teaching “the systems view” and “interdisciplinarity” methods and skills. Furthermore, it is necessary to consider the entire life cycle...
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Friction Stir Welding of Aluminum in the Aerospace Industry: The Current Progress and State-of-the-Art Review
PublikacjaThe use of the friction stir welding (FSW) process as a relatively new solid-state welding technology in the aerospace industry has pushed forward several developments in different related aspects of this strategic industry. In terms of the FSW process itself, due to the geometric limitations involved in the conventional FSW process, many variants have been required over time to suit the different types of geometries and structures,...
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Complementary study with magnetic and acoustic techniques of A336 steel damage state due to creep
PublikacjaBadano możliwość detekcji w sposób nieniszczący zmian w mikrostrukturze stali A336 poddanej próbie pełzania. Testowano dwie magnetyczne techniki (klasyczny efekt Barkhausena i emisję magnetoakustyczną) oraz dwie nowe techniki ultradźwiękowe (pomiar współczynnika elasto-akustycznego oraz dwójłomność akustyczną). Wykazano, iż wyniki badań akustycznych są komplementarne do wyników badań magnetycznych.
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Capacity-fairness performance of an ad hoc IEEE 802.11 WLAN with noncooperative stations
PublikacjaWykazano, że wartości kombinowanego wskaźnika wydajności lokalnej sieci bezprzewodowej ze stacjami niekooperacyjnymi, uwzględniającego przepustowość i sprawiedliwość rozdziału pasma, są znacznie niższe od przewidywanych na podstawie modeli działania kooperacyjnego. Sytuację może poprawić zastosowanie przez stacje inteligentnych strategii motywacyjnych pod warunkiem, że liczba stacji jest niewielka i są one wystarczająco uwarunkowane...
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Long-term effects of device-guided slow breathing in stable heart failure patients with reduced ejection fraction
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Optimization-based stacked machine-learning method for seismic probability and risk assessment of reinforced concrete shear walls
PublikacjaEfficient seismic risk assessment aids decision-makers in formulating citywide risk mitigation plans, providing insights into building performance and retrofitting costs. The complexity of modeling, analysis, and post-processing of the results makes it hard to fast-track the seismic probabilities, and there is a need to optimize the computational time. This research addresses seismic probability and risk assessment of reinforced...
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Alternatywna metoda oceny bezpieczeństwa statków w stanie uszkodzonym. Gotowość systemu statek w analizie ryzyka
PublikacjaW pracy przedstawiono elementy związane z oceną gotowości systemu statek w stanie uszkodzonym. Zdefiniowano pojęcie gotowości. Przedstawiono system bezpieczeństwa transportu morskiego i statków, w tym system bezpieczeństwa statku w stanie uszkodzonym. Opisano wybrane elementy analizy ryzyka, w tym te dotyczące obliczania i oceny ryzyka. Przedstawiono przykładowe drzewo udziału w ryzyku. Opisano też problemy związane z ocena gotowości...
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Intense and stable room-temperature photoluminescence from nanoporous vanadium oxide formed by in-ambient degradation of VI3 crystals
PublikacjaVanadium oxides have attracted research interest because their optoelectronic properties make them optically active with room-temperature photoluminescence (PL) emission, which, however, is not sufficiently intense for real applications. For this reason, many nanostructured vanadium oxides are currently fabricated through several precursors and different treatments to improve the PL efficiency and enhance the PL intensity. Herein,...
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Enhanced hydrogen evolution reaction on highly stable titania-supported PdO and Eu2O3 nanocomposites in a strong alkaline solution
PublikacjaIn this work, PdO/TiO2 and Eu2O3/TiO2 nanocomposites (NCs), were synthesized using a new facile, template-free and one-step solvothermal approach, and characterized by several instrumentation techniques. X-ray photoelectron spectroscopy (XPS) studies revealed the presence of oxidised form of the Pd and Eu nanoparticles within the nanocomposite materials (PdO and Eu2O3). The two catalysts exhibited remarkable activity for the HER...
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A Wideband Corrugated Ridged Horn Antenna with Enhanced Gain and Stable Phase Center for X- and Ku-Band Applications
PublikacjaIn this letter, a structure and design procedure of a novel double-flared conical horn antenna with an improved gain and a stable phase center is presented. The antenna incorporates a hybrid ridged and corrugated structure. A double-ridged section is responsible for ensuring a wideband operation, whereas the corrugated section supports the hybrid mode. The antenna impedance bandwidth (VSWR < 2) is 6 GHz to 20 GHz. Excellent performance...
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Nowy algorytm regulacji transformatorów zasilających siec rozdzielczą
PublikacjaW niniejszym artykule opisano przykład nowego inteligentnego algorytmu regulatora transformatora. Układ regulacji transformatorów 110/SN, z proponowanym algorytmem działania, umożliwia automatyczne dostosowanie algorytmu działania regulatorów do aktualnych stanów systemu elektroenergetycznego (np. lawina napięcia) i w ten sposób może wpłynąć na wzrost bezpieczeństwa elektroenergetycznego.
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Adaptacyjny algorytm regulacji transformatorów zasilających sieć rozdzielczą
PublikacjaW niniejszym artykule opisano przykład nowego inteligentnego regulatora transformatora. Układ regulacji transformatorów 110/SN, z proponowanym algorytmem działania, umożliwia automatyczne dostosowanie algorytmu działania regulatorów do aktualnych stanów systemu elektroenergetycznego (np. lawina napięcia) i w ten sposób może wpłynąć na wzrost bezpieczeństwa elektroenergetycznego.
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Multi-stage magnetic-fluid seals for operating in water - life test procedure, test stand and research results. Part II Results of life tests of multi-stage magnetic - fluid seal operating in water
PublikacjaThe edge criteria for magnetic-fluid seals durability research were described in previous article [24] and now the tests results are presented. The tests were made with three magnetic fluids using various magnets quantity in magnetic assemblies. If values obtained in the repeated test deviated by more than 10 % from results of the first test an additional control test was made for final characteristics. The characteristics are:...
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Concept of implementation of open water model tests for assessment of safety of ships in damaged conditions
PublikacjaPraca zawiera opis koncepcji zastosowania badań modelowych na wodach otwartych w odniesieniu do oceny bezpieczeństwa statków w stanie uszkodzonym. Badania modelowe w omawianym zakresie mogą stanowić alternatywną metodę oceny bezpieczeństwa statków w stanie uszkodzonym lub mogę służyć do weryfikacji oceny bezpieczeństwa statków w stanie uszkodzonym, przeprowadzonej za pomocą metody zawartej w zharmonizowanej wersji konwencji SOLAS...
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Modeling of hazards, consequences and risk for safety assessment of ships in damaged conditions in operation
PublikacjaPraca dotyczy problematyki związanej z modelowaniem zagrożeń, konsekwencji i ryzyka, w metodzie oceny bezpieczeństwa statków w stanie uszkodzonym. Metoda oparta jest na podejściu zorientowanym na ocenę zachowania się statku i ocenę ryzyka wypadku. Kolejne moduły metody dotyczą identyfikacji zagrożeń i scenariuszy wypadków oraz oceny i kontroli ryzyka. Ocenę ryzyka można przeprowadzić przy zastosowaniu elementów metodyki Przypadku...
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Effect of fabric anisotropy on shear localization in sand during plane strain compression
PublikacjaW artykule przedstawiono wyniki numerycznej wpływu anizotropii strukturalnej w materiałach granulowanych na powstawanie lokalizacji odkształceń. Obliczenia wykonano dla ściskania w płaskim stanie odkształcenia stosując metodę elementów skończonych na bazie mikropolarnego modelu hipoplastycznego.
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Możliwości tłumienia kołysań wirników generatorów przez kompensatory statyczne typu SVC
PublikacjaW artykule przedstawiono ideę wykorzystania kompensatorów statycznych typu SVC do tłumienia kołysań wirników generatorów. Zaproponowano strukturę regulatora SVC pozwalającą na poprawę własności dynamicznych systemu elektroenergetycznego. Przedstawiono wyniki badań dla proponowanej struktury regulatora, które zostały przeprowadzone dla modelu trzy maszynowego, jak również dla modelu polskiego systemu elektroenergetycznego.
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The state-of-the-art determination of urinary nucleosides using chromatographic techniques “hyphenated” with advanced bioinformatic methods
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Influence of charge transfer state on Eu 3+ luminescence in LaAlO 3 , by high pressure spectroscopy
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Perception and determinants of agricultural technology adoption in North Shoa Zone, Amhara Regional State, Ethiopia
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Parametric and Non Parametric Methods for Efficiency Assessment of State Higher Vocational Schools in 2009-2011
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Two-stage quasi-Z-source network based step-up DC/DC converter
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Caratheodory solutions to quasi-linear hyperbolic systems of partial differential equations with state dependent delays
PublikacjaW pracy udowodniono twierdzenie o istnieniu i jednoznaczności rozwiązań oraz o ich ciągłej zależności od warunków początkowych dla układów równań różniczkowych cząstkowych z opóźnionym argumentem, zależnym od funkcji niewiadomej. Posłużono się metodą bicharakterystyk a istnienia dowiedziono stosując twierdzenie Banacha o punkcie stałym.
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Agro‐industrial wastes for production of paclitaxel by irradiated Aspergillus fumigatus under solid‐state fermentation
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Device characteristics extraction by low frequency noise measurements; Someresults on the state-of-the-art MOSFET´s
PublikacjaPrzedstawiono wyniki pomiarów i analizy szumów tranzystorów MOSFET z izolatorem bramki wykonanym z SiO2 i HfO2. Wyniki pomiarów wykorzystano do oszacowania gęstości aktywnych stanów na powierzchni użytego tlenku i porównano z wynikami otrzymanymi metodą charge-pumping.
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Computer aided registration of current pulses in polyethylene insulation during the first stage of electrical treeing.
PublikacjaW referacie przedstawiono aplikację w programie Labview do automatycznej rejestracji impulsów prądowych zjawisku drzewienia elektrycznego w izolacji polietylenowej.
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Initial stage of (Bi-Pb)2Sr2Ca1Cu2Ox high Tc superconductor crystallisation from the amorphous phase.
PublikacjaWysokotemperaturowe nadprzewodniki bizmutowe 2201, 2212 i 2223 były wytwarzane metodą krystalizacji w fazie stałej. Zmiany struktury i mikrostruktury badano metodą dyfrakcji rentgenowskiej oraz skanningowej mikroskopii elektronowej. Zbadano kinetykę krystalizacji oraz przedyskutowano jej przebieg.
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Innovative Urban Blue Space Design in a Changing Climate: Transition Models in the Baltic Sea Region
PublikacjaWaterfront areas in cities are subject to constant changes. The desire to integrate the transformed waterside areas with the urban fabric involves shaping high-quality public spaces related to water, which are often referred to as urban blue spaces (UBS). The aim of the research was to examine the transformation processes of urban waterfront areas in the Baltic Sea Region and identify emerging transition models and types of blue...
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Anomaly Detection in Railway Sensor Data Environments: State-of-the-Art Methods and Empirical Performance Evaluation
PublikacjaTo date, significant progress has been made in the field of railway anomaly detection using technologies such as real-time data analytics, the Internet of Things, and machine learning. As technology continues to evolve, the ability to detect and respond to anomalies in railway systems is once again in the spotlight. However, railway anomaly detection faces challenges related to the vast infrastructure, dynamic conditions, aging...
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Bending Moment Control and Weight Optimization in Space Structures by Adding Extra Members in the Optimal Locations
PublikacjaThis paper investigates the reduction of bending moment in critical members by adding some extra members in the optimum location. Instead of enlarging the size of members to resist the moment, eight additional members are added in the optimum location to reduce the bending moment in the critical members. The total weight of the proposed structure with extra members is less than that of the original structure that resists the induced...
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Analysis of the structure of the atomized fuel spray with marine diesel engine injector in the early stage of injection
PublikacjaThis paper presents the results of the experimental research of the atomized fuel spray with the marine diesel engine injector in the constant volume chamber. The specificity of the phenomena occurring in the marine engine cylinder was the reason to use the optical visualisation method in the studies – the Mie scattering technique. This work presents an analysis of the influence of different geometry of outlet orifice and opening...
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Steady-state characteristics and dynamic response of the PEM fuel cell to unit step change of load
PublikacjaPodano opis układu zasilania opartego na dwóch ogniwach paliwowych typu PEM o łącznej mocy 2.4 kW. Zaprezentowano wybrane charakterystyki statyczne i dynamiczne układu.
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VERSATILE SPACE OF PERSIAN COURT HOUSE IN ISFAHAN USED AS POLISH CHILDREN HABITAT DURING THE WW2
PublikacjaDuring WW2 thousands of Polish citizens were deported to Siberia and Kazakhstan in the USSRdoomed to exterminating labour. The Polish army was also detained there. The Iranian Shahallowed Polish soldiers and civilians to cross from Russia to Iran. In Isfahan Polish fugitives, mainlychildren, were accommodated in Persian traditional court houses which were converted into theirtemporary habitat, where new...
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A Case Study on the Desired Selectivity in Solid‐State Mechano‐ and Slow‐Chemistry, Melt, and Solution Methodologies
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Transmission vs. Diffuse Transmission in Circular Dichroism: What to Choose for Probing Solid-State Samples?
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