Filters
total: 2743
filtered: 2344
-
Catalog
Chosen catalog filters
displaying 1000 best results Help
Search results for: user activities modelling
-
Modelling Signalised Intersections Reliability of Functioning
PublicationThe article addresses a fundamental aspect of traffic, i.e. the operation of traffic signals at intersections, in reference to the reliability theory. In many cases, when intersections carry substantial amounts of traffic, selecting control parameters to produce satisfactory traffic conditions is quite difficult. Design methods do not cover all possible situations which are the result of intersection geometry and location...
-
Modelling an accelerometer for robot position estimation
PublicationThe article describes a new model of a MEMS accelerometer for usage in inertial measurement units (IMU). Such units allow to measure orientation and location of the sensor/system and therefore can be applied for systems positioning. The main purpose of the paper is to model pertinent accelerometer functions substantial in determination of the location of the sensor by means of double integration of acceleration. The model takes...
-
Simplified modelling of heat transfer in groundwater
PublicationPrzenoszenie ciepła w wodach podziemnych jest skomplikowanym, przestrzennym procesem. Z tego względu do rozwiązywania zadań praktycznych celowe jest konstruowanie modeli uproszczonych. W pracy zaproponowano sposób formułowania modelu dwuwymiarowego. Został on pozytywnie zweryfikowany na przykładzie badania przyczyn strat energii cieplnej w elektrowni Kozienice.
-
Soft modelling support for information management
PublicationW artykule zaproponowano trzystopniowy proces modelowania przepływów informacji. Zaproponowane stopnie obejmują dekompozycje, reprezentacje i integracje. Przedyskutowano możliwości wspomagania każdego z powyższych stopni przypomocy systemów opartych na bazie wiedzy, głównie inteligentnego przeszuki-wania, systemów ekspertowych i sieci neuronowych.
-
Applications of soft modelling and intelligent techniques
PublicationW edytorialu omówiono szeroko obecne praktyczne zastosowania modelowania miękkiego oraz technik inteligentnych, rozumianych jako takie techniki, które potrafią wspomagać podejmowanie decyzji w zmiennych warunkach otoczenia.
-
Nonlinear modelling of eathquake induced pounding.
PublicationZaprezentowano nieliniowy model lepkosprężysty siły zderzenia w czasie kontaktu między konstrukcjami podczas trzęsień ziemi. Efektywność modelu sprawdzono przez porównanie wyników analizy numerycznej z wynikami eksperymentalnymi. Wyniki badań pokazują, iż rozważany model najdokładniej symuluje siłę zderzenia w czasie.
-
Molecular modelling of a psychrophilic β-galactosidase
PublicationAntarktyczny szczep, gram-ujemnych bakterii, wyizolowanych z przewodu pokarmowego kryla z gatunku Thyssanoessa macrura, sklasyfikowany na podstawie analizy sekwencji nukleotydowej geny 16S rDNA jako Pseudoalteromonas sp. 22b jest producentem wewnątrzkomórkowej zimnolubnej beta-galaktozydazy. Ponieważ enzym ten wykazuje wysoką aktywność katalityczną w zakresie temperatur od 0 do 30 stC, stanowi on atrakcyjny biokatalizator, użyteczny...
-
Mesoscopic modelling of strain localization in concrete
PublicationArtykuł omawia obliczenie lokalizacji odkształceń w elementach betonowych poddanych zginaniu. Obliczenia wykonano dla betonu na poziomie mezo przy zastosowaniu modelu zniszczeniowego z degradacją sztywności rozszerzonego o nielokalność. Zbadano wpływ zagęszczenia kruszywa, wielkość kruszywa, kształtu kruszywa oraz długości charakterystycznej na szerokość lokalizacji.
-
Application and modelling of Shape-Memory Alloys for structural vibration control: State-of-the-art review
PublicationOne of the most essential components of structural design for civil engineers is to build a system that is resistant to environmental conditions such as harsh chemical environments, and catastrophic disasters like earthquakes and hurricanes. Under these circumstances and disturbances, conventional building materials such as steel and concrete may demonstrate inadequate performance in the form of corrosion, deterioration, oxidizing,...
-
The Influence of COD Fraction Forms and Molecules Size on Hydrolysis Process Developed by Comparative OUR Studies in Activated Sludge Modelling
PublicationThe activated sludge models (ASMs) commonly used by the International Water Association (IWA) task group are based on chemical oxygen demand (COD) fractionations. However, the proper evaluation of COD fractions, which is crucial for modelling and especially oxygen uptake rate (OUR) predictions, is still under debate. The biodegradation of particulate COD is initiated by the hydrolysis process, which is an integral part of an ASM....
-
Modelling of Ship’s Heeling and Rolling for the Purpose of Gantry Control Improvement in the Course of Cargo Handling Operations in Sea Ports
PublicationThe paper presents two proposals of models of interaction between a ship and cargo being loaded or discharged by a gantry in port, in terms of heeling and rolling of the vessel. The main purpose of such modelling is the need for improvement of gantry control with regard to faster operations thanks to more accurate estimation of level and moment of cargo release from a gantry hook or spreader. The study may be the contribution to...
-
An automatic selection of optimal recurrent neural network architecture for processes dynamics modelling purposes
PublicationA problem related to the development of algorithms designed to find the structure of artificial neural network used for behavioural (black-box) modelling of selected dynamic processes has been addressed in this paper. The research has included four original proposals of algorithms dedicated to neural network architecture search. Algorithms have been based on well-known optimisation techniques such as evolutionary algorithms and...
-
Numerical modelling and analysis of steel specimens subjected to marine immersed corrosion and tensile load
PublicationThe present study develops numerical models to analyse the behaviour of steel specimens subjected to marine immersed corrosion degradation and tensile load. The finite element method with the use of the explicit dynamic solver LS-DYNA, satisfying the quasi-static conditions, is employed. Two numerical models are developed, where in the first one, the scans of surfaces gathered from corroded plate specimens are implemented directly...
-
Reduced-cost surrogate modelling of compact microwave components by two-level kriging interpolation
PublicationFull-wave electromagnetic (EM) analysis is a versatile tool for evaluating the performance of high-frequency components. Its potential drawback is its high computational cost, inhibiting the execution of EM-driven tasks requiring massive simulations. The applicability of equivalent network models is limited owing to the topological complexity of compact microstrip components because of EM cross-coupling effects. Development of...
-
Building Information Modelling as an opportunity and risk for stakeholders involved in construction investment process
PublicationThe requirements to apply Building Information Modelling (BIM) in public investments worldwide are currently very high. Significant interest (sometimes formulated also as a requirement) in BIM technology can be observed also among private investors. Design technology that applies BIM is supported by many private investors due to its numerous advantages. A growing group of construction designers (steel, concrete and reinforced concrete...
-
The impact of military activities on the concentration of mercury in soils of military training grounds and marine sediments
Publication -
Antimicrobial and antioxidant activities of Cinnamomum cassia essential oil and its application in food preservation
Publication -
Polyoxygenated cyathane diterpenoids from the mushroom Cyathus africanus, and their neurotrophic and anti-neuroinflammatory activities
Publication -
A comparative study of phenolic compounds and antioxidant and antiproliferative activities in frequently consumed raw vegetables
PublicationCelem badań było oszacowanie właściwości przeciwutleniających wybranych warzyw spożywczych w stanie surowym: czosnek (Allium sativum L), biała, żółta i czerwona cebula (Allium cepa L), czerwony i zielony pieprz (Capsicum annuum L.) oraz biała kapusta (Brassica oleracea var. capitata f. alba) zbieranych w ciągu tego samego roku z różnych regionów geograficznych i stref klimatycznych. W badaniach odpowiednich ekstraktów metanolowych...
-
Green Synthesis of ZnO nanoparticles using Nigella sativa seed extract for antibacterial activities
Publication -
Comparison of bioactive compounds, antioxidant and antiproliferative activities of Mon Thong durian during ripening
PublicationCelem przeprowadzonych badań było oszacowanie zmian zawartości związków odżywczych, związków bioaktywnych, kwasów tłuszczowych oraz przeciwutleniaczy w owocach duriana w trakcie różnych etapów procesu dojrzewania. W badaniach wykorzystano testy CURRAC, DPPH, ABTS i FRAP. Stwierdzono, że całkowita zawartość polifenoli, flawonoidów, kwasu askorbimowego, tanin oraz poziom aktywności przeciwutleniającej jest dla owoców niedojrzałych,...
-
Protection and conservation of modern movement heritage in Gdynia - some examples of local Government activities
Publicationartykuł dotyczy ochrony i konserwacji acrhitektury modernizmu na przykładzie miasta Gdyni
-
Biological activities of leaf extracts from selected Kalanchoe species and their relationship with bufadienolides content
Publication -
Phytochemical Profiling, Mineral Elements, and Biological Activities of Artemisia campestris L. Grown in Algeria
Publication -
In vivo anti-inflammatory and anti-allergic activities of cynaroside evaluated by using hydrogel formulations
Publication -
In vitro antioxidant, anti-inflammatory activities and acetylcholinesterase inhibition properties of selected plant extracts
Publication -
Composition of the Essential Oil of Bidens tripartita L. Roots and Its Antibacterial and Antifungal Activities
Publication -
The relationship between standard reduction potentials of catechins and biological activities involved in redox control
PublicationRedox homeostasis involves factors that ensure proper function of cells. The excess reactive oxygen species (ROS) leads to oxidative stress and increased risk of oxidative damage to cellular components. In contrast, upon reductive stress, insufficient ROS abundance may result in faulty cell signalling. It may be expected that dietary antioxidants, depending on their standard reduction potentials (E°), will affect both scenarios....
-
Low-cost data-driven modelling of microwave components using domain confinement and PCA-based dimensionality reduction
PublicationFast data-driven surrogate models can be employed as replacements of computationally demanding full-wave electromagnetic simulations to facilitate the microwave design procedures. Unfortunately, practical application of surrogate modelling is often hindered by the curse of dimensionality and/or considerable nonlinearity of the component characteristics. This paper proposes a simple yet reliable approach to cost-efficient modelling...
-
Extending Continuous Integration with Post-mortem Debug Automation of Unhandled Exceptions Occurred in Kernel or User Mode Applications
PublicationThe paper proposes extension of the Continuous Integration practices with debug automation of unhandled exceptions. Goal of this improvement is to reduce the amount of redundant work when inspecting hundreds of failed tests from possibly the same reason, and to decrease time necessary to provide a fix to the codebase. The suitable CI infrastructure is proposed and an automatic method how to eliminate duplicated bugs is discussed....
-
User-assisted methodology targeted for building structure interpretable QSPR models for boosting CO2 capture with ionic liquids
PublicationTask-specific ionic liquid (IL) is an emerging class of compounds that may be environmentally friendly. Properly selected, these compounds may be green alternative to amine solutions and can replace them in post-combustion carbon dioxide (CO2) capture processes on an industrial scale. However, owing to the vast diversity of ions and their possible combinations, laboratory research is time consuming and expensive. Therefore, computational...
-
Modelling of residential sales price with kriging using different distance metrics in different correlation functions
PublicationThe modelling and estimation of sales prices based on economical conditions are important for housing sector especially in developing countries. Analysts are focused on the subject to analyze price movements and estimate the future trend of the sales prices for housing sector. In this study, we tried to generate a robust and efficient model related to the subject. Firstly, we investigated economic variables affecting housing sales...
-
Modular Approach for Modelling Warming Up Process in Water Installations with Flow-Regulating Elements
PublicationThe paper presents a new method for modelling the warming up process of a water system with elements regulating the flow in a stochastic manner. The paper presents the basic equations describing the work of typical elements which the water installation is composed of. In the proposed method, a new computational algorithm was used in the form of an iterative procedure enabling the use of boundary conditions that can be stochastically...
-
Modelling of the Polish Electricity Generation Subsystem in MARKAL Program with Emphasis on the EU Emissions Trading Scheme
PublicationThis paper addresses issues related to greenhouse gas emissions in the European Union and measures to reduce them, in particular the European Emissions Trading Scheme (EU ETS). A model of the Polish electricity generation subsystem, taking into account EU ETS mechanisms, has been developed using the MARKAL optimization package. Data collected on the basis of available projects, regulations and statistics were entered into the model....
-
Modelling of some stealth features for a small navy ship at the concept design stage - part II
PublicationIn the paper a few problems associated with modelling the basic stealth features for a small ship at the concept design stage are introduced. One problem concerns the modification of the immersed ship hull using the rapid change of the ship loading condition. The second is associated with the modification of the ship boundary layer by the hull skin cover. The other stealth features of the ship are not presented in this paper. The...
-
Mathematical Modelling of Drive System with an Elastic Coupling Based on Formal Analogy between the Transmission Shaft and the Electric Transmission Line
PublicationIn the paper, the kinematic structure of the transmission shaft between the driving motor and the working mechanism is studied. The analysis is based on electrical and mechanical similarities. The equivalent circuits, typical for electrical systems, are defined for the transmission shaft concerned. Modelling of the transmission shaft based on a formal analogy between the transmission shaft and the electric transmission line is...
-
The modelling and enhancement of water hydrodynamics: general discussion
Publication -
Human Preference Modelling in Usability of Graphical Interfaces
Publication -
Molecular Modelling of the Neurophysin II/Vasopressin Complex
Publication -
Modelling and diagnostics of a traction transformer - a case study
PublicationW niniejszym artykule przedstawiono wyniki badań w dziedzinie diagnostyki kolei elektrycznych. Zostały one przeprowadzone przez międzynarodowe przemysłowo-akademickie konsorcjum w ramach projektu europejskiego (6-go programu ramowego). Skupiono się na modelowaniu transformatora trakcyjnego z myślą o rozwinięciu nieinwazyjnej metody diagnostycznej w czasie rzeczywistym. Model przeznaczony do badań finalnych został rozwinięty w oparciu...
-
Semi-Markov Approach to the Shipping Safety Modelling
Publication -
Fading modelling in dynamic off-body channels
Publication -
Numerical modelling of DMT test in calibration chamber
PublicationAnaliza numeryczna badania DMT wykonanego w komorze kalibracyjnej w Katedrze Geotechniki Politechniki Gdańskiej. Badania przeprowadzono w piasku Lubiatowo średnio zagęszczonym i zagęszczonym przy składowej pionowej naprężenia 100 kPa. Modelowano proces wciskania ostrza dylatometru oraz fazę odkształcenia membrany. Analiza parametryczna uwzględnia wpływ wartości kąta tarcia wewnętrznego i dylatancji oraz modułu odkształcenia uzyskanych...
-
Modelling and Identification of Tower Type Historic Buildings
PublicationW pracy omawia się problemy modelowania i identyfikacji zabytkowych murowanych budowli wieżowych na przykładzie wieży Twierdzy Wisłoujście. Przedstawiono analizę modalną na podstawie dwukierunkowych pomiarów przyspieszeń na 9 poziomach wieży. Wyniki analizy posłużyły do identyfikacji modelu matematycznego budowli w postaci sztywnego bloku na podłożu sprężystym. Wykorzystano hierarchiczną procedurę opartą na analizie wrażliwości.
-
DFT modelling of the edge dislocation in 4H-SiC
Publication -
Sensor data fusion techniques for environment modelling
Publication -
Mathematical modelling: Lessons from composite indicators
PublicationWe discuss here composite indicators as mathematical models, which can be looked at through the lenses of the five rules discussed in this volume. Composite indicators sit between analysis and advocacy, and their use has social and political implications. For this reason, the lenses of the manifesto can be used to build them better, to make them more transparent, as well as to inspect incumbent indicators for methodological or...
-
Knowledge management and fuzzy modelling in software engineering
PublicationPraca zawiera rozdział poświecony problematyce budowy systemów z bazami wiedzy dla wspomagania procesów zarządzania. W rozdziale tym przedstawiono metody budowy systemów dla potrzeb zarządzania koncentrując uwagę na systemach opartych na wiedzy. Następnie omówiono możliwości zastosowania teorii zbiorów rozmytych do modelowania wiedzy. Na zakończenie przedstawiono przykład wykorzystania zbiorów rozmytych i systemów opartych na wiedzy...
-
Modelling of bio-mechanical objects: recent examples
PublicationW opracowaniu przedstawiono dwa wykorzystania modelowania bio-mechanicznego wybranych obiektów: modelowanie zachowania mięśni w układzie ramię-przedramię oraz wstępny projekt protezy dłoni przy użyciu materiałów z pamięcią kształtu. Przedstawiono wyniki badań symulacyjnych oraz opis dynamiki działania układów sterowania dla protezy dłoni oraz dla układu ramię-przedramię.
-
Wave Propagation Modelling in Composite Plates with Damages
PublicationW pracy przedstawiono model i wyniki analizy propagacji fali spręzystej w płycie kompozytowej z uszkodzeniami.