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Search results for: SHIP ENGINE DYNAMICS
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Chinese Journal of Ship Research [ 中国舰船研究 ]
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An examination of the effect of ethanol–gasoline blends' physicochemical properties on emissions from a light-duty spark ignition engine
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LABORATORY STUDY ON INFLUENCE OF AIR DUCT THROTTLING ON EXHAUST GAS COMPOSITION IN MARINE FOUR-STROKE DIESEL ENGINE
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The Product of Matrix Metalloproteinase Cleavage of Doxorubicin Conjugate for Anticancer Drug Delivery: Calorimetric, Spectroscopic, and Molecular Dynamics Studies on Peptide–Doxorubicin Binding to DNA
PublicationMatrix metalloproteinases (MMPs) are extracellular matrix degradation factors, promoting cancer progression. Hence, they could provide an enzyme-assisted delivery of doxorubicin (DOX) in cancer treatment. In the current study, the intercalation process of DOX and tetrapeptide-DOX, the product of the MMPs' cleavage of carrier-linked DOX, into dsDNA was investigated using stationary and time-resolved fluorescence spectroscopy, UV-Vis...
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Ocean mixed layer dynamics: high-resolution simulations of wind, wave and convective effects
Open Research DataThis dataset contains results of high-resolution numerical simulations of the ocean mixed layer (OML) forced by wind, waves and cooling from the atmosphere, i.e., under strongly turbulent, convective conditions. The goal is to provide detailed, three-dimensional information about OML circulation, turbulent kinetic energy, and temperature and salinity...
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Straightening of ship hull structure made of 316L stainless steel - tensile test of reference material materia (transverse direction)
Open Research DataThe AISI 316L type steel belongs to the group of chromium-nickel stainless steels. They are determined according to European standards as X2CrNiMo17-12-2 and belong to the group of austenitic stainless steels. Steels of this group are used for elements working in seawater environments, for installations in the chemical, paper, and food, industries,...
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Straightening of ship hull structure made of 316L stainless steel - tensile test of reference material materia (longitudinal direction)
Open Research DataThe AISI 316L type steel belongs to the group of chromium-nickel stainless steels. They are determined according to European standards as X2CrNiMo17-12-2 and belong to the group of austenitic stainless steels. Steels of this group are used for elements working in seawater environments, for installations in the chemical, paper, and food, industries,...
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Triticale extrudates – Changes of macrostructure, mechanical properties and molecular water dynamics during hydration
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MEL zeolite nanosheet membranes for water purification: insights from molecular dynamics simulations
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Crystal structure, hydrogen bonds, and lattice dynamics in kanemite from first-principles calculations
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Dynamic Formation and Breaking of Disulfide Bonds in Molecular Dynamics Simulations with the UNRES Force Field
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Thermodynamics, size, and dynamics of zwitterionic dodecylphosphocholine and anionic sodium dodecyl sulfate mixed micelles
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Combining tight-binding and molecular dynamics methods to model the behaviour of metals in the plastic regime
PublicationOpisujemy zastosowanie metody dwuskalowej (kwantowo-klasycznej) w zastosowaniu do metali. Region energetycznie najważniejszy jest traktowany kwantowo, podczas gdy reszta układu jest traktowana klasycznie. Wprowadzamy własną implementację metody oraz przedstawiamy uzyskane wyniki dla metali.
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Dynamics of Microbiome Changes in the Endometrium and Uterine Cervix during Embryo Implantation: A Comparative Analysis
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Population dynamics of Baltic herring since the Viking Age revealed by ancient DNA and genomics
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Molecular aspects of the interaction between amphotericin B and a phospholipid bilayer: molecular dynamics studies.
PublicationAmfoterycyna B jest antybiotykiem z grupy polienów makrolidowych. Stosowany jest on w leczeniu układowych infekcji grzybowych. Wiadomo że związek ten oddziałuje ze składnikami błon lipidowych i tworzy kanały. W przedstawianej pracy prezentowane są wyniki symulacji przeprowadzonej dynamiką molekularną układu składającego się z 200 cząsteczek lipidów DMPC i jednej cząsteczki amfoterycyny ułożonej na powierzchni błony. Z przeprowadzonej...
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Tool Life and Process Dynamics in High Speed Ball End Milling of Hardened Steel
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Fem and time stepping procedures in non-linear dynamics of flexible branched shell structures.
PublicationW pracy dyskutowano problemy całkowania równań ruchu, sformułowanych w ramach nieliniowej sześcioparametrowej teorii powłok. Główne myśli dotyczą zbieżności rozwiązań uzyskanych w procesie aproksymacji przestrzennej i czasowej oraz analizy stabilności rozwiązań MES.
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Multimodal analysis of traction forces and the temperature dynamics of living cells with a diamond-embedded substrate
PublicationCells and tissues are constantly exposed to chemical and physical signals that regulate physiological and pathological processes. This study explores the integration of two biophysical methods: traction force microscopy (TFM) and optically detected magnetic resonance (ODMR) to concurrently assess cellular traction forces and the local relative temperature. We present a novel elastic substrate with embedded nitrogen-vacancy microdiamonds...
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Non-linearity of multibody dynamic equations with respect to Lagrange multipliers: application to railway dynamics
PublicationPraca koncentruje się na dynamice układów wieloczłonowych z zamkniętymi łańcuchami członów. Głównym punktem zainteresowania jest modelowanie układów z występującymi nieliniowymi zależnościami opisującymi wpływ siły mnożników Lagrange'a na dynamikę układu (nieliniowe modele siły tarcia.). Aby zbudować model dynamiki układu zawierającego zamknięte łańcuchy członów, wspomniane łańcuchy są "rozcinane" i budowana jest struktura drzewa...
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Source-related Wavefields in Fluids and Dielectrics: A new way of Thinking about Medium Dynamics
PublicationAcoustic and electromagnetic wave phenomena may seem to have a proper formal representation in field theory dating from the 19th century, founded on the mathematics of complex functions. This paper shows, however, that when replacing the classical spectrum-domain approach related to the assumption of harmonic timeform of signals, with a time-domain approach imposingnorestrictionastotheclassoftimeevolutionofsourceandfieldsignals,...
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Fractional neutron point kinetics equations for nuclear reactor dynamics – Numerical solution investigations
PublicationThis paper presents results concerning numerical solutions to a fractional neutron point kinetics model for a nuclear reactor. The paper discusses and expands on results presented in (Espinosa-Paredes et al., 2011). The fractional neutron point kinetics model with six groups of delayed neutron precursors was developed and a numerical solution using the Edwards’ method was proposed (Edwards et al., 2002). The mathematical model...
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Dynamics of productivity in higher education: cross-european evidence based on bootstrapped Malmquist indices
PublicationAbstract This study examines patterns of productivitychange in a large set of 266 public higher educationinstitutions (HEIs) in 7 European countries across the timeperiod 2001-2005. We adopt consistent bootstrap estimationprocedures to obtain confidence intervals for Malmquistindices of HEI productivity and their components.Consequently, we are able to assess the statistical significanceof changes in HEI productivity, efficiency...
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Dynamics of productivity in higher education. Cross-European evidence based on bootstrapped Malmquist indices
PublicationThis study presents patterns of productivity change in a large set of 266 public higher education institutions (HEIs) from 7 European countries across the time period 2001-2005. We adopt consistent bootstrap estimation procedures to obtain confidence intervals for Malmquist indices of HEI productivity and their components. Consequently, we are able to assess statistical significance of the changes in HEIs' productivity, efficiency...
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Smart modeling support for managing complexities and dynamics of knowledge-based systems - part 2
PublicationPrzedstawiono i poddano analizie najnowsze trendy w zakresie kierunków badań dotyczących inteligentnego wspomagania zarządzania dynamiką i kompleksowością systemów opartych na wiedzy.
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Molecular dynamics study on the role of solvation water in the adsorption of hyperactive AFP to the ice surface
PublicationUsing computer simulations, the early stages of the adsorption of the CfAFP molecule to the ice surface were analyzed. We found that the ice and the protein interact at least as early as when the protein is about 1 nm away from the ice surface. These interactions are mediated by interfacial solvation water and are possible thanks to the structural ordering of the solvent. This ordering leads to positional preference of the protein...
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Furan Fragmentation in the Gas Phase: New Insights from Statistical and Molecular Dynamics Calculations
PublicationWe present a complete exploration of the different fragmentation mechanisms of furan (C4H4O) operating at low and high energies. Three different theoretical approaches are combined to determine the structure of all possible reaction intermediates, many of them not described in previous studies, and a large number of pathways involving three types of fundamental elementary mechanisms: isomerization, fragmentation, and H/H2 loss...
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Influence of a lipid bilayer on the conformational behavior of amphotericin B derivatives - A molecular dynamics study.
PublicationAmphotericin B (AmB) is an effective but very toxic antifungal antibiotic. In our laboratory a series of AmB derivatives of improved selectivity of action was synthesized and tested. To understand molecular basis of this improvement, comparative conformational studies of amphotericin B and its two more selectivederivatives were carried out in an aqueous solution and in a lipid membrane. These molecular simulation studies revealed...
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Influence of Protonation State on the Excited State Dynamics of a Photobiologically Active Ru(II) Dyad
PublicationThe influence of ligand protonation on the photophysics of a ruthenium (Ru) dyad bearing the 2-(1-pyrenyl)-1H-imidazo[4,5-f][1,10]-phenanthroline (ippy) ligand was investigated by time-resolved transient absorption spectroscopy. It was found that changes in the protonation state of the imidazole group led to changes in the electronic configuration of the lowest lying excited state. Formation of the fully deprotonated imidazole...
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Dynamics analysis of footbridge mode shapes the s8 expressway on the basis of the results of in situ tests
PublicationNon-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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Study on population dynamics for triple-linked food chain using a simulation-based approach
PublicationThe procedures based on simulation have become a feasible testing method that does not require investing valuable resources to create a concrete prototype, especially with the increasing computational power of computers. Thus, design changes can be adopted and design errors can be fixed before it is too late. Simulation turns to be a cheap, safe and often more acceptable from an ethical perspective. In our work we summarize the...
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Numerical Modeling of Water and Ice Dynamics for Analysis of Flow Around the Kiezmark Bridge Piers
PublicationThis paper presents the results of a numerical model study on the effect of ice on the proposed bridge piers in the Vistula River outlet and its effect on flow conditions in the river. The model DynaRICE is used in this study, which is a two-dimensional hydro-ice dynamic numerical model developed for dynamic ice transport and jamming in rivers. To simulate river hydrodynamics in the vicinity of the bridge piers, 2-dimensional numerical...
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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...
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Anisotropic mechanical behavior and auxeticity of penta-graphene: Molecular statics/molecular dynamics studies
PublicationWe investigate the mechanical properties of penta-graphene (PG), a recently proposed two-dimensional carbon allotrope using atomistic simulation techniques combined with the empirical description of interatomic interactions. We report on the dependence of its three in-plane mechanical moduli (i.e. Young's modulus, Poisson's ratio and shear modulus) on the deformation direction, strain and temperature. We show that PG displays a...
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Bistability in a One-Dimensional Model of a Two-Predators-One-Prey Population Dynamics System
PublicationIn this paper, we study a classical two-predators-one-prey model. The classical model described by a system of three ordinary differential equations can be reduced to a one-dimensional bimodalmap. We prove that this map has at most two stable periodic orbits. Besides, we describe the bifurcation structure of the map. Finally, we describe a mechanism that leads to bistable regimes. Taking this mechanism into account, one can easily...
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An adaptive-noise Augmented Kalman Filter approach for input-state estimation in structural dynamics
PublicationThe 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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Expert elicitation of a navigation service implementation effects on ship groundings and collisions in the Gulf of Finland
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Enhancing human performance in ship operations by modifying global design factors at the design stage
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Safety Qualification Process for an Autonomous Ship Prototype – a Goal-based Safety Case Approach
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A design concept of main propulsion system with hydrostatic transmission gear for inland waterways ship
PublicationCelem analizy jest przedstawienie koncepcji napędu głównego statku oraz określenie jego sprawności całkowitej. Zrealizowanie zamierzenia przedstawionego powyżej wymaga spojrzenia na opis strat i sprawności energetycznej przekładni hydrostatycznej, uwzględniający jak najdalej idącą jego prostotę. Obraz wzajemnego wpływu strat we wszystkich elementach układu hydraulicznego okazuje się bardzo złożony. Przy założeniu koniecznych uproszczeń...
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On a risk-based method for safety assessment of a ship in critical conditions at the preliminary design stage.
PublicationW pracy przedstawiono wybrane rezultaty badań na temat metody oceny bezpieczeństwa statków w warunkach krytycznych, na etapie projektu wstępnego. Podano główne założenia nowoczesnego podejścia do oceny bezpieczeństwa statków. Przedstawiono opis metody do projektowania statków dla bezpieczeństwa, w warunkach krytycznych. Opisano główne elementy modelu obliczeniowego. Podano wybrane wyniki obliczeń. Opisano propozycje dalszych badań.
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Semi-Markow Processes as Models of Devices´ Operating Process of Ship Pro-pulsion System
PublicationReferat zawiera formalny opis procesu eksploatacji urządzeń.
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Design and experimental evaluation of pod propulsor models for a large self-propelled ship model.
PublicationArtykuł przedstawia serię hydrodynamicznych badań swobodnych dwóch modeli pędnika podowego. Pędniki zostały zaprojektowane i zbudowane specjalnie dla dwóch wersji dużego modelu okrętu z własnym napędem, przeznaczonego do eksperymentów manewrowych. Jedna wersja jest napędzana pojedyńczym pędnikiem, druga jest wyposażona w dwa pędniki. Oba modele podów były badane w kanale obiegowym. Celem eksperymentu były pomiary sześciu składowych...
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Computer graphics toos application for visualsation of measurements results of ship hull sections and blocks.
PublicationOpisano zakres minimalnych wymagań dla programu komputerowego, służącego do wizualizacji wyników pomiarów sekcji i bloków kadłuba okrętowego. Przedstawiono sposób przenoszenia danych z urządzenia pomiarowego do programu i pokazano przykłady pomiarów wykonanych na sekcjach zbudowanych w Stoczni Gdynia S.A.
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Water-lubricated bearings of ship propeller shafts - problems, experimental tests and theoretical investigations
PublicationW pracy przedstawiono problemy związane z projektowaniem, montażem i ekspolatcją smarowanych wodą łożysk okrętowych wałów głównych.Przedstawiono wyniki prowadzonych prac badawczych ekperymntalnych i obliczeń.
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Damage tests of the single shell ship fuel tank with additional elastic protective coating
PublicationWejście na mieliznę lub kolizja średniej wielkości np. kontenerowca może doprowadzić do zanieczyszczenia środowiska Morza Bałtyckiego paliwem uwolnionym z rozszczelnionych, jednoposzyciowych zbiorników dennych, a ilość tego paliwa może być znaczna. W związku z tym podjęto prace badawcze zmierzające do opracowania sposobu obniżenia ryzyka rozlewu paliwa w wypadku kolizji poprzez wprowadzenie drugiej bariery ochronnej. Idea pomysłu...
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Impact of the Time Window Length on the Ship Trajectory Reconstruction Based on AIS Data Clustering
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Design and thermodynamic and thermoeconomic analysis of an organic Rankine cycle for naval surface ship applications
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Design and thermodynamic analysis of an H2O–LiBr AHP system for naval surface ship application
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Changing the Ship Propulsion System Performances Induced by Variation in Reaction Degree of Turbocharger Turbine
PublicationArtykuł przedstawia szczegółowy model matematyczny układu napędu statku obejmującego: wolnoobrotowy silnik spalinowy okrętowy, śruba okrętowa oraz regulator prędkości kątowej. Model ten, następnie jest wykorzystany do badania symulacyjnego zachowania układu zarówno w stanach ustalonych jak i nieustalonych. Model jest zweryfikowany z wynikami eksperymentalnymi. Przedstawienie oryginalnej metody oceny wrażliwości układu względem...