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Gdańsk University of Technology

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Publications from the year 2018

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  • Application of Potentiometric Taste Sensor with All Solid State Electrodes for Distinguishing of Red Dry Wines from Polish and French Vineyards
    • Elwira Brodnicka
    • Maria Szpakowska
    2018 TOWAROZNAWCZE PROBLEMY JAKOŚCI. POLISH JOURNAL OF COMMODITY SCIENCE

    Opracowano nowy potencjometryczny czujnik smaku z sześcioma różnymi elektrodami typu All Solid State Electrode (ASSE). Każda z elektrod zawiera dwie warstwy: polimer przewodzący i membranę lipidowo-polimerową, w której rozpuszczone są poszczególne związki lipidowe. Potencjometryczny sensor smaku charakteryzuje się globalną selektywnością. Zastosowano go w celu odróżnienia próbek wytrawnych czerwonych win pochodzących z różnych polskich i francuskich winnic. Wina użyte do badań zostały wyprodukowane ze szczepu Pinot Noir (Vitis vinifera) i pochodziły z rocznika 2014. Wina te wyprodukowane zostały w polskich winnicach: Adoria i Miłosz oraz francuskiej winnicy Barton & Guestier. Stwierdzono, że potencjometryczny sensor smaku był stabilny przez trzy dni i był czuły na stężenia kwasu winowego. Próbki wina pochodzące z danej winnicy, lecz różnych butelek znajdują się w tej samej grupie na wykresie PCA. Wina pochodzące z polskiego regionu upraw są bliżej zlokalizowane na wykresie PCA niż wino francuskie. Jest to prawdopodobnie spowodowane tym, że wino francuskie charakteryzuje się niższą kwasowością organoleptyczną i wyższą zawartością fruktozy niż wina polskie. Wyniki sugerują, że ten nowy sensor może być używany do rozróżniania win czerwonych z polskich i francuskich winnic.

  • Application of Rapid Prototyping technology in the manufacturing of turbine blade with small diameter holes
    • Mariusz Deja
    • Michał Dobrzyński
    • Paweł Flaszyński
    • Jacek Haras
    • Dawid Zieliński
    2018 Full text Polish Maritime Research

    The article presents the possibilities of using Rapid Prototyping (RP) technology in the manufacturing of turbine blades with small diameter holes. The object under investigation was gas turbine blade with small diameter cooling holes and holes for generating longitudinal vortices. A turbine blade model was produced by means of Direct Metal Laser Sintering (DMLS) technology and subsequently validated in terms of detection and accuracy of the obtained holes. The application of the computer tomography and digital radiography technique resulted in obtaining a series of cross-sections of the turbine blade model with a series of holes. Particular attention was pointed out at the investigation of the locations of micro-holes with a diameter of 0.3 mm. It turned out that it was impossible to make such small holes by the RP method. In the following part the results of the study on the possibilities of making the micro-holes using electrical discharge method have been presented. In addition, proposition of further works such as the development of the considerations and issues discussed in this article, has been offered.

  • APPLICATION OF REDUNDANCY IN SHIP POWER PLANTS OF OFFSHORE VESSEL
    • Wiesław Tarełko
    2018 Full text New Trends in Production Engineering

    Power and propulsion systems of offshore units must be of a very high level of reliability. The loss of ability to perform functions of their components causes generally to very high economic losses, which may be increased by unused the weather window resulting to postponing the planned offshore operations. To ensure carrying out so expensive offshore operations in the most reliable way, various types of redundancies are built-in ship power plants. This paper deals with issues related to application of redundancy in ship power plants of offshore vessels. Especially, evolution of redundancy application in ship power plants, and design solution of redundancy for offshore vessels are presented. Moreover, the specifics of these offshore operations so important from the point of view of minimizing financial losses due to any interruptions caused by failures of power and propulsion systems are discussed in detailed way.

  • APPLICATION OF STATISTICAL FEATURES AND MULTILAYER NEURAL NETWORK TO AUTOMATIC DIAGNOSIS OF ARRHYTHMIA BY ECG SIGNALS
    • Amine B. Slama
    • Łukasz Lentka
    • Aymen Mouelhi
    • Mohamed F. Diouani
    • Mounir Sayadi
    • Janusz Smulko
    2018 Full text Metrology and Measurement Systems

    Abnormal electrical activity of heart can produce a cardiac arrhythmia. The electrocardiogram (ECG) is a non-invasive technique which is used as a diagnostic tool for cardiac diseases. Non-stationarity and irregu- larity of heartbeat signal imposes many difficulties to clinicians (e.g., in the case of myocardial infarction arrhythmia). Fortunately, signal processing algorithms can expose hidden information within ECG signal contaminated by additive noise components. This paper explores a method of de-noising ECG signal by the discrete wavelet transform (DWT) and further detecting arrhythmia by estimated statistical parameters. Parameters of the de-noised ECG signals were used to form an input data vector determining whether the examined patient suffers from a cardiac arrhythmia or not. Input data were transformed using selected lin- ear methods in order to reduce dimension of the input vector. A neural network was used to detect illness. Compared with the results of recent studies, the proposed method provides more accurate diagnosis based on the examined ECG signal data.

  • Application of Support Vector Machine for Determination of Impact of Traffic-Induced Vibrations on Buildings
    • Anna Jakubczyk-Gałczyńska
    • Adam Kristowski
    • Robert Jankowski
    2018 Advances in Intelligent Systems and Computing

    The aim of the article is to present an algorithm of Support Vector Machine created to forecast the impact of traffic-induced vibrations on residential buildings. The method is designed to classify the object into one of two classes. The classification into the first class means that there is no impact of vibrations on the building, while classification to the second class indicates the possible influence and suggests the execution of expert studies. Variety of factors affecting impact of vibrations on the structure were taken into account in the algorithm. These factors induce: condition of the road surface, condition of the building, soil type, the distance from the building to the road and type of the vehicle.

  • Application of the Barkhausen effect probe with adjustable m agnetic field direction for stress state determination in the P91 ste el pipe
    • Marek Chmielewski
    • Leszek Piotrowski
    2018 Full text Journal of Electrical Engineering

    The paper presents the results of application of a novel Barkhausen effect (BE) probe with adjustable magnetizing field direction for the stress level evaluation in ferromagnetic materials. The investigated sample was in a form of a pipe, made of P91 steel that was anisotropic due to the production process. The measurements were performed before and after welding, revealing the influence of welding process on the residual stress distribution. As was observed, the process introduced high tensile stresses in the normal to the weld direction (which can be interpreted as a decrease of strongly compressive residual stresses present in martensitic steels). In addition to that, the paper presents investigations of the measurement set performance corroborating its applicability for Barkhausen effect signal measurements in the magnetically anisotropic materials. The signals obtained during manual rotation of the probe (typical method of BE measurements) are very similar to those recorded during automatic field axis rotation.

  • APPLICATION OF THE KOSECKI’S METHOD IN DESIGNING OF OFFSHORE WIND POWER PLANTS FOUNDATION
    • Kamila Międlarz
    • Paweł Więcławski
    2018 Full text ACTA SCIENTIARUM POLONORUM. SERIA: ARCHITECTURA

    The concept of offshore wind power plants has been well developed in many European countries. There is no such thing as design of offshore wind power plants according to national tradition. The main problem is the lack of standards and guidelines. Ones being applied are Scandinavian or American methods which are not fully adapted to the conditions of the Baltic Sea. The article focuses on the monopile design, as it is currently the most often used type of offshore power plants foundation. The results from analysis, according to standard wind turbine monopile design methods, were compared with the results obtained from the Kosecki’s method. The geometry analyzed in the article goes beyond the scope of defined geometrical and technological coefficients used to determine the stiffness of spring supports. The adopted stages of the analysis allowed to determine the limit of applicability of the Kosecki’s method for monopiles loaded horizontally.

  • Application of the Optimum Dataset Method in Archeological Studies on Barrows
    • Wioleta Blaszczak-Bak
    • Andrzej Dumalski
    • Anna Sobieraj-Żłobińska
    2018

    Light Detection and Ranging (LiDAR) became one of the technologies used in archaeological research. It allows for relatively easy detection of archaeological sites that have their own field form, e.g.: barrows, fortresses, tracts, ancient fields [1]. As a result of the scanning, the so-called point cloud is obtained, often consisting of millions of points. Such large measurement datasets are very time-consuming and labor-intensive in processing. Therefore, works on optimization of those datasets are constantly being carried out [3]. In this study it was decided to test the Optimum Dataset (OptD) method [4]. It allows to reduce the measurement dataset, what can improve DTM generation, 3D modeling of archaeological objects. The OptD method was used for the development of Terrestrial Laser Scanning (TLS) measurements of barrows. The acquired point cloud has been reduced in several variants to show the degree of reduction. The user/archaeologist decides about the usefulness of each reduced TLS datasets.

  • Application of titanium dioxide thin films in fiber optic sensors
    • Marzena Hirsch
    2018 Zeszyty Naukowe Wydziału ETI Politechniki Gdańskiej. Technologie Informacyjne

    The advance in the nanotechnology and fabrication of micro- and nanostructures has significant impact on development of new optical sensors. Presented study focuses on the applications of the titanium dioxide (TiO2) thin films in fiber optic sensors. The concept of a sensing fiber optic interferometer integrating TiO2 thin film is presented. The cavity of this interferometer is delimited by a 80 nm film fabricated on the end-face of the standard telecommunication single mode optical fiber (SMF-28) by use of the Atomic Layer Deposition (ALD) and a protected silver mirror. The simulation of spectral reflectance of the thin film is performed and its performance in a multi-cavity structure of the fiber optic Fabry-Pérot interferometer is analyzed. The results show that proposed interferometer could be successfully implemented in optical fiber sensors of selected physical and biochemical quantities.

  • APPLICATION OF VORTEX FLOW MODEL IN PROPELLER-STATOR SYSTEM DESIGN AND ANALYSIS
    • Przemysław Król
    • Tomasz Bugalski
    2018 Full text Polish Maritime Research

    The paper covers basics of the vortex model used for propeller-stator systems. The outline of the design algorithm is given and the results of its application are shown. The designed propeller-stator system was the subject of model tests run at the CTO model basin and cavitation tunnel. Stator’s influence on the delivered power required by the propeller and its revolution rate has been examined by conducting self-propulsion tests with and without stator. The tests performed in the cavitation tunnel revealed only weak tip vortex cavi tation on the propeller. No cavitation was observed on the stator at the design point. A wide range of the performed tests allowed the authors to identify details of the developed theory which will require further improvement.

  • Application of Web-GIS and Geovisual Analytics to Monitoring of Seabed Evolution in South Baltic Sea Coastal Areas
    • Marcin Kulawiak
    • Andrzej Chybicki
    2018 MARINE GEODESY

    Regular surveys of coastal zone seabed deliver important information about geomorphologic processes such as silting of waterways. The recent introduction of the Sentinel series of sensors has allowed for the use of satellite sensing for shallow bathymetry morphology monitoring. In this context, this article presents a dedicated Geographic Information System for Baltic Sea shallow water depth monitoring on the basis of Sentinel-2 imagery. The system employs Geovisual Analytics for differential analysis of bathymetry changes as well as monitoring the visibility of known wrecks in the coastal waters of Southern Baltic Sea. Results are verified with regard to known changes in shallow water bathymetry between June 28th, 2015 and March 3rd, 2017.

  • Application possibilities of LBN for civil engineering issues
    • Agata Siemaszko
    • Magdalena Apollo
    2018 Full text MATEC Web of Conferences

    Bayesian Networks (BN) are efficient to represent knowledge and for the reasoning in uncertainty. However the classic BN requires manual definition of the network structure by an expert, who also defines the values entered into the conditional probability tables. In practice, it can be time-consuming, hence the article proposes the use of Learning Bayesian Networks (LBN). The aim of the study is not only to present LBN, which can be helpful in civil engineering problems, but also to analyze and evaluate the potential of a selected software. Based on a real example the functional values of the Open Markov, Hugin and AgenaRisk applications were compared.

  • Applications of Tensor Analysis in Continuum Mechanics
    • Victor Eremeev
    • Michael Cloud
    • Leonid Lebedev
    2018

    A tensor field is a tensor-valued function of position in space. The use of tensor fields allows us to present physical laws in a clear, compact form. A byproduct is a set of simple and clear rules for the representation of vector differential operators such as gradient, divergence, and Laplacian in curvilinear coordinate systems. The tensorial nature of a quantity permits us to formulate transformation rules for its components under a change of basis. These rules are relatively simple and easily grasped by any engineering student familiar with matrix operators in linear algebra. More complex problems arise when one considers the tensor fields that describe continuum bodies. In this case general curvilinear coordinates become necessary. The principal basis of a curvilinear system is constructed as a set of vectors tangent to the coordinate lines. Another basis, called the dual basis, is also constructed in a special manner. The existence of these two bases is responsible for the mysterious covariant and contravariant terminology encountered in tensor discussions. This book provides a clear, concise, and self-contained treatment of tensors and tensor fields. It covers the foundations of linear elasticity, shell theory, and generalized continuum media, offers hints, answers, and full solutions for many of the problems and exercises, and Includes a handbook-style summary of important tensor formulas. The book can be useful for beginners who are interested in the basics of tensor calculus. It also can be used by experienced readers who seek a comprehensive review on applications of the tensor calculus in mechanics. Contents: Chapter 1: Vectors and Transformations Chapter 2: Tensors and Tensor Fields Chapter 3: Elements of Differential Geometry Chapter 4: Linear Elasticity Chapter 5: Linear Elastic Shells Chapter 6: Mechanics of Generalized Media Appendices: Equation Summary for Tensor Analysis Some Formulas for Particular Coordinate Systems Main Equations of Linear Elasticity Hints and Answers

  • Applying a Mesoscopic Transport Model to Analyse the Effects of Urban Freight Regulatory Measures on Transport Emissions—An Assessment
    • Jacek Oskarbski
    • Daniel Kaszubowski
    2018 Full text Sustainability

    Sustainable urban freight management is a growing challenge for local authorities due to social pressures and increasingly more stringent environmental protection requirements. Freight and its adverse impacts, which include emissions and noise, considerably influence the urban environment. This calls for a reliable assessment of what can be done to improve urban freight and meet stakeholders’ requirements. While changes in a transport system can be simulated using models, urban freight models are quite rare compared to the tools available for analysing private and public transport. Therefore, this article looks at ways to extend Gdynia’s existing mesoscopic transport model by adding data from delivery surveys and examines the city’s capacity for reducing CO2 emissions through the designation of dedicated delivery places. The results suggest that extending the existing model by including freight-specific data can be justified when basic regulatory measures are to be used to improve freight transport. There are, however, serious limitations when an exact representation of the urban supply chain structure is needed, an element which is required for modelling advanced measures.

  • Applying of thin plate boundary condition in analysis of ship’s magnetic field
    • Piotr Jankowski
    • Mirosław Wołoszyn
    2018 COMPEL-THE INTERNATIONAL JOURNAL FOR COMPUTATION AND MATHEMATICS IN ELECTRICAL AND ELECTRONIC ENGINEERING

    This paper presents computer simulations of ship’s magnetic signatures using a new thin plate boundary condition implemented in the Opera-3d 18R2 program. The paper aims to check the magnetic signatures’ numerical calculations precision of objects using the thin plate boundary conditions and analysis of the magnetic signature of ship with a degaussing system and with and without inner devices.

  • Approach for Determination of Functioning of Lower Limb Muscles
    • Wiktoria Wojnicz
    • Bartłomiej Zagrodny
    • Michał Ludwicki
    • Małgorzata Syczewska
    • Jerzy Mrozowski
    • Jan Awrejcewicz
    2018

    The purpose of the study is elaboration of approach for determination of functioning of chosen muscles that are essential for gait performance (Tibialis Anterior, Rectus Femoris, Gastrocnemius Medialis, Biceps Femoris). The scope of the study involves the analysis of the symmetric planar motion performing in the sagittal plane of the body by applying planar multibody model and electromyography signals (EMG) registered over normal gait performance. The analysis is performed by applying two types of multibody model: six degree of freedom system and seven degree of freedom system. Inverse dynamics task was used to calculated joint moments influenced ankle joints, knee joints and hip joints. Applied model also described single support phase and double support phase by taking into consideration the model of interaction between the ground and the contact foot. The activity states of considered muscles are determined on the base of their average activations and sequences in time.

  • Approximate Criteria for the Evaluation of Truly Multi-Dimensional Optimization Problems
    • Zdzisław Kowalczuk
    • Tomasz Białaszewski
    2018

    In this paper we propose new improved approximate quality criteria useful in assessing the efficiency of evolutionary multi-objective optimization (EMO). In the performed comparative study we take into account the various EMO algorithms of the state-of-the-art, in order to objectively assess the EMO performance in highly dimensional spaces. It is well known that useful executive criteria, such as those based on the true Pareto front in highly multidimensional spaces, can be tedious or even impossible to calculate. On the other hand, the proposed synthetic quality criteria are easy to implement, computationally inexpensive, and sufficiently informative and effective.

  • Approximate Quality Criteria for Difficult Multi-Objective Optimization Problems
    • Zdzisław Kowalczuk
    • Tomasz Białaszewski
    2018 Full text

    This paper introduces approximate analytic quality criteria useful in assessing the efficiency of evolutionary multi-objective optimization (EMO) procedures. We present a summary of extensive research into computing. In the performed comparative study we take into account the various approaches of the state-of-the-art, in order to objectively assess the EMO performance in highly dimensional spaces; where some executive criteria, such as those based on the true Pareto front, are difficult to calculate. Whereas, on the other hand, the proposed approximated quality criteria are easy to implement, computationally inexpensive, and sufficiently effective.

  • Approximate Quality Criteria for Difficult Multi-Objective Optimization Problems
    • Zdzisław Kowalczuk
    • Tomasz Białaszewski
    2018 Full text

    This paper introduces approximate analytic quality criteria useful in assessing the efficiency of evolutionary multi-objective optimization (EMO) procedures. We present a summary of extensive research into computing. In the performed comparative study we take into account the various approaches of the state-of-the-art, in order to objectively assess the EMO performance in highly dimensional spaces; where some executive criteria, such as those based on the true Pareto front, are difficult to calculate. Whereas, on the other hand, the proposed approximated quality criteria are easy to implement, computationally inexpensive, and sufficiently effective.

  • Aqueous solutions of NMA, Na2HPO4 , and NaH2PO4 as models for interaction studies in phosphate–protein systems
    • Karol Biernacki
    • Emilia Kaczkowska
    • Piotr Bruździak
    2018 Full text JOURNAL OF MOLECULAR LIQUIDS

    Phosphate buffers are essential for many areas of studies. However, their influence on buffered systems is often ignored. The phosphate salts can interact with biologically important macromolecules (e.g. proteins) and stabilize or destabilize them. With our research, we want to answer question what kind of interactions, if any, occur between phosphate ions and a protein backbone model — N-methylacetamide (NMA). ATR-FTIR spectroscopy in the amide I range and in the regions characteristic for PO vibrations provides information on direct and indirect (water-mediated) interactions. The analysis is supported by chemometric, DFT, and QTAIM calculations. Our results indicate that direct NMA–phosphate ion interactions are quite rare and indirect. Water molecules seem to play an important role in such systems. The model studies indicate that no preferential interactions between NMA and phosphate ions in solutions are formed, and may imply that such interactions are also unfavorable in protein-based systems.