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  • The 15th Workshop on Progress in Trace Metal Speciation for Environmental Analytical Chemistry
    • Renata Marcinkowska
    • Jacek Namieśnik
    2017 Pełny tekst ANALYTICAL AND BIOANALYTICAL CHEMISTRY

    Artykuł jest sprawozdaniem z konferencji TRACESPEC - the 15th Workshop on progress in trace Metal Speciation for Environmental Analytical Chemistry, ktora odbyla sie we wrzesniu 2016 na Politechnice Gdańskiej. W artykule przedstawiono głowne cele i załozenia konferencji oraz opisano program naukowy.

  • THE 3D MODEL OF WATER SUPPLY NETWORK WITH APPLICATION OF THE ELEVATION DATA
    • Anna Sobieraj-Żłobińska
    • Beata Wieczorek
    2017

    3D visualization is a key element of research and analysis and as the source used by experts in various fields e.g.: experts from water and sewage systems. The aim of this study was to visualize in three-dimensional space model of water supply network with relief. The path of technological development of GESUT data (Geodezyjna Ewidencja Sieci Uzbrojenia Terenu – geodetic records of public utilities) for water supply and measurement data from airborne laser scanning was proposed. Topological relationship tests were conducted. It was also checked, whether the current form of digital database of GESUT gives the ability to transform it into a three-dimensional. Authors analyzed the source data for completeness and consistency in accordance with regulation on county and national databases of GESUT. The article also refers to the actions that currently takes the Head Office of Geodesy and Cartography: K-GESUT and CAPAP. In both cases, the spatial data will have a coordinates in three-dimensional space. The use of spatial 3D database technology allows to detect and eliminate errors caused by: data conversion from analog, measurement errors, and collision detection of objects designed with existing objects. Visualization of the spatial data sets influences the development of innovative applications of a three-dimensional spatial information. The advanced way of presenting spatial data is used in all kinds of analyzes, maps, simulation and modeling of phenomena. There is possibility to use 3D data in the inventory process and replacing site visits and the use of data in the spatial planning.

  • The accretion of the new ice layer on the surface of hexagonal ice crystal and the influence of the local electric field on this process
    • Joanna Grabowska
    • Anna Kuffel
    • Jan Zielkiewicz
    2017 Pełny tekst JOURNAL OF CHEMICAL PHYSICS

    The process of creation of a new layer of ice on the basal plane and on the prism plane of a hexagonal ice crystal is analyzed. It is demonstrated that the ordering of water molecules in the already existing crystal affects the freezing. On the basal plane, when the orientations of water molecules in the ice block are random, the arrangement of the new layer in a cubic manner is observed more frequently — approximately 1.7 times more often than in a hexagonal manner. When the water molecules in the ice block are more ordered, it results in the predominance of the oxygen atoms or the hydrogen atoms on the most outer part of the surface of the ice block. In this case, the hexagonal structure is formed more frequently when the supercooling of water exceeds 10 K. This phenomenon is explained by the influence of the oriented electric field, present as a consequence of the ordering of the dipoles of water molecules in the ice block. This field modifies the structure of solvation water (i.e., the layer of water in the immediate vicinity of the ice surface). We showed that the structure of solvation water predetermines the kind of the newly created layer of ice. This effect is temperature-dependent: when the temperature draws nearer to the melting point, the cubic structure becomes the prevailing form. The temperature at which the cubic and the hexagonal structures are formed with the same probabilities is equal to about 260 K. In the case of the prism plane, the new layer that is formed is always the hexagonal one, which is independent of the arrangement of water molecules in the ice block and is in agreement with previous literature data. For the basal plane, as well as for the prism plane, no evident dependence on the ordering of water molecules that constitute the ice block on the rate of crystallization can be observed.

  • The accuracy of a new approach to order determination for the Modified Prony method in swath mapping application
    • Piotr Grall
    2017 Pełny tekst HYDROACOUSTICS

    This article presents the performance of a new approach to determine the model order for the modified Prony method applied to swath acoustic mapping. Key requirements for any mapping application are depth determination accuracy and angular resolution. Depth determination accuracy is strictly related to angular accuracy and geometrical relations between receiver and sources of the backscattered signal. Angular resolution determines detection capabilities of targets laying on the seafloor. Performance of the proposed method, in terms of these two parameters, is tested against a simulated signal in a number of generic configurations, and compared to the results of other methods applied to the same signal.

  • The accuracy of alternative stock valuation methods – the case of the Warsaw Stock Exchange
    • Błażej Prusak
    2017 Pełny tekst Economic Research-Ekonomska Istrazivanja

    The main aim of this article is to examine the accuracy of different methods of share valuation used by Polish analysts in reports prepared in order to issue recommendations for companies listed on the Warsaw Stock Exchange. In the literature on the subject, the view which prevails is that the more sophisticated methods, i.e. those taking into account the discounting process, are characterised by higher valuation accuracy. However, the results of the present analysis show that Polish analysts achieve more accurate valuations using the market approach than the DCF model. Nevertheless, the highest level of accuracy is achieved by the target price, which in most cases is the value of the weighted average of valuations obtained via a market valuation and discounting methods. In terms of the multiples which are taken into account in this research, the highest accuracy is achieved with the use of EV/EBIT, although there are no statistically significant differences between the valuations calculated using this multiple and the results obtained with the P/E and EV/EBITDA multiples. Valuations prepared with the use of individual multiples usually generate greater errors compared to the DCF model and the market approach, which uses the weighted average of the valuations achieved with individual multiples.

  • The advanced monitoring as a key factor for appropriate optimization and control of full-scale activated sludge systems – case study Debogorze WWTP.
    • Jakub Drewnowski
    • Anna Remiszewska-Skwarek
    2017

    Computer simulation has become a helpful tool in wastewater treatment systems performance and effectiveness analysis. Advanced monitoring, by using appropriate software, enables to create a mathematical model of a real wastewater treatment plant (WWTP), run a simulation and subsequently interpret results under various conditions. An operation of WWTP is usually controlled by global parameters such as flow, solids retention time, sludge age, concentration of ammonia and dissolved oxygen, etc. Furthermore key factor are also recirculated sludge pumps after sedimentation in the secondary clarifier and stirrers installed inside the reactor zones and on their borders (designed to cause circulation within each zone and internal recirculation between the zones of reactor). The way of their installation and arrangement (and hence the distribution of flow between the zones) depends on the activated sludge system. Unfortunately, very often technical solutions used (and even under design process) intend to underlie malfunctioning of the bioreactor. Thus, one of the basic elements of a well-implemented mathematical model could be appropriate diagnosis of bioreactor processes zone and hydraulic changes (it means quantitative determination of streams within individual zones and their flow directions). Therefore, the tracer study is the best way to adequately describe the biochemical processes taking place in different zones of the bioreactor (USGS, 1986). This study also allows to properly identify directions and propagation of fluxes between the zones that, together with the on-line measurements and other operating parameters indirectly exhibit the effectiveness and condition of activated sludge system. The aim of this study was to evaluate the optimization of the biological treatment processes at “Debogorze” WWTP in Gdynia (northern Poland) using the advanced monitoring study combining tracer and batch tests together with the COD fractionation method. These methods measures the biomass activity and together with mathematical modeling and computer simulations are the key factor for appropriate optimization and control of full-scale activated sludge systems

  • The Algorithm of Modelling and Analysis of Latent Semantic Relations: Linear Algebra vs. Probabilistic Topic Models
    • Nina Rizun
    • Wojciech Waloszek
    • Taranenko Yurii
    2017 Pełny tekst

    This paper presents the algorithm of modelling and analysis of Latent Semantic Relations inside the argumentative type of documents collection. The novelty of the algorithm consists in using a systematic approach: in the combination of the probabilistic Latent Dirichlet Allocation (LDA) and Linear Algebra based Latent Semantic Analysis (LSA) methods; in considering each document as a complex of topics, defined on the basis of separate analysis of the particular paragraphs. The algorithm contains the following stages: modelling and analysis of Latent Semantic Relations consistently on LDA- and LSA-based levels; rules-based adjustment of the results of the two levels of analysis. The verification of the proposed algorithm for subjectively positive and negative Polish-language film reviews corpuses was conducted. The level of the recall rate and precision indicator, as a result of case study, allowed to draw the conclusions about the effectiveness of the proposed algorithm

  • The Analysis of Container Vessel Service Efficiency in the Aspect of Berth and Handling Equipment Usage in Polish Ports
    • Adam Kaizer
    • Leszek Smolarek
    • Ewelina Ziajka
    • Karolina Krośnicka
    2017

    The paper analyses the efficiency of container vessel service in Polish container terminals taking under considerations different berth layouts and handling equipment.

  • THE ANALYSIS OF THE INFLUENCE OF STRESS DISTRIBUTION ON WEAR PROFILE IN LUBRICATED SLIDING CONTACT OF UHMW-PE VS TITANIUM Ti-13Nb-13Zr ALLOY
    • Katarzyna Zasińska
    • Tomasz Seramak
    • Jacek Łubiński
    • Grzegorz Rotta
    2017 Pełny tekst TRIBOLOGIA

    Metal – polymer sliding contacts are a typical combination in industry and medicine. For decades such a set of materials has been the primary choice in human joints endoprosthetic technology. In this paper tribological issues of are presented from a research on the potential for practical use of Ti-13Nb-13Zr/UHMW-PE couple for orthopedic endoprosthesis. In tests on simplified models it is critically important to carefully select geometry of contact, load and velocity magnitudes and profiles to the later interpretation of results. In case of organic polymers interacting with metallic components the problem is even more prominent, than in the case of all metal systems because of great differences in the modulus of elasticity between the specimens in contact. High local loading can cause excessive heat generation and accelerated loss in polymer’s strength induced by thermal plastification. The process may not be manifested in the course of the experiment in any way detectable and might compromise the accuracy of wear measurement. In the case of the presented research an analysis has been performed to evaluate the observed wear profile of UHMW-PE with respect to non-uniform distribution of contact stress. A simulation was run with the use of FEM to evaluate the contact conditions between the titanium alloy and UHMW-PE specimens and the results were confronted with the wear profiles. Interesting similarities were discovered yielding useful information on the fundamentals of the wear in and for future research on similar systems.

  • The analysis of tram tracks geometrical layout based on Mobile Satellite Measurements
    • Cezary Specht
    • Władysław Koc
    • Piotr Chrostowski
    • Jacek Szmagliński
    2017 Pełny tekst Urban Rrail Transit

    In this article, the results of the research in a field of which uses active global navigation satellite system (GNSS) geodetic networks for the inventory of geodetic geometric tram tracks are presented. The applied measurement technique has been adapted for the designing of the geometric layout of tram tracks. Several configurations of receivers and settings of an active GNSS networks with the objective to increase the accuracy of positioning and the availability of accurate localization are investigated. The measurement methods are optimized in order to increase the accuracy of determining positions from 3 mm up to 6 mm. Thus, the study of deformations in geometric layouts—according to the authors—is already possible. The implementation techniques of the mobile satellite measurements in a field of tram track inventory process are presented in this article. The course of the measurements and the results of the inventory of the tram system in Gdansk, Poland have been discussed. The results have turned out to be extremely useful for the geometric track layout evaluation. It has been proved that the applied method allows a comprehensive tram network inventory to be performed based on satellite measurements. The presented method is fast and cost-efficient.

  • The application of nonlinear curvature sections in the turnout diverging track
    • Władysław Koc
    2017 Pełny tekst Przegląd Komunikacyjny

    The paper presents the analytical method of modelling the diverging track of railway turnout with nonlinear curvature sections. These sections were used for smoothing the graph of curvature in the extreme areas of turnout. The problem of the curvature distribution was identified with the use of differential equations. The resulting solutions are of universal nature for example the ability of assuming any values of curvature at the beginning and ending of the layout. The comparative analysis was performed for two cases with nonlinear curvature and corresponding cases where linear curvature was used. As a result, the analysis of selected cases showed a beneficial curvature distribution in a nonlinear variant, the extreme areas of circular arc are smoothed as well as the curvature at both ends of the layout is equal to zero.

  • THE ARCHITECTURE OF DAYLIGHT IN THE DISCOURSE ABOUT THE AESTHETICS OF SUSTAINABILITY
    • Małgorzata Rogińska-Niesłuchowska
    2017

    The need to create ecological and energy efficient architecture is evident today. In the contemporary discourse on architecture more and more attention is dedicated to the aesthetics that expresses the idea of sustainability. The article is a voice in this debate, concentrating on the architecture that features daylight. Solar light comes from the natural environment and brings some substantial benefits for the architectural space, such as light, warmth and atmosphere, which should be reflected in the aesthetics of the building. The paper shows some aesthetic approaches to the architecture of daylighting presented in a number of theoretical works and innovative projects designed by distinguished theorists and architects. The study has shown that the most outstanding architects make a continuous effort to find a new aesthetic expression of their architectural concepts by using daylight. Representative buildings attract the public not only by their dynamic form, but also by the unusual structure of their facades and their ability to interact with the surroundings. Architects arrange changes in the daily appearance of the building by enhancing creative effects of daylight on the facade. They use spectacular high-tech solutions or cooperate with nature.

  • The Brain of the city
    • Zymberi Aferdita
    • Lukic Aleksandra
    • Vukovic Milutin
    • Arar Nataly
    • Weronika Maria Mazurkiewicz
    • Julian Lozano Cazorla
    • Lampart Adrianna
    • Nosek Anita
    • Rejowicz Kamil
    2017 Pełny tekst

    In order to highlight the characteristics of the West End of Wrocław, we conducted a site analysis. Using the strengths of the site, we were able to create a unique concept of the district while minimizing the impacts of weaknesses by design. The purpose of redesigning the West End of Wrocław is to attract new people to the district through the transformation of an identity. Initially, we conducted a SWOT analysis to identify the strengths, weaknesses, opportunities and threats of the site, helping us understand the location and situation. Our contextual understanding of Wrocław helped develop our concept: "Brain of the City", which is a self-sustaining ecosystem and a proposed unified vision for the City of Wrocław.

  • The Brick Face of Modernism and Architecture of Gustav Oelsner
    • Małgorzata Kostrzewska
    • Bartosz Macikowski
    2017 Pełny tekst Studia Komitetu Przestrzennego Zagospodarowania Kraju PAN

    There are many reasons that make the work of Gustav Oelsner worth to present. One of the reasons is comparison of two different ways of development of two cities, Gdynia (an exhibition of work of Gustav Oelsner was presented in Gdynia in April and May of 2011) and Altona, were Oelsner created his architecture. These two cities has grown at the side of their big neighbours, Gdansk and Hamburg. They are harbour cities and their full bloom took place in the beginning of XX century, in the time of revolutionary changes in architecture and urbanism. It gives possibility to compare two different faces of Modernism. It gives also chance to compare contemporary reception and the problem of protection of heritage of Modernism. Next important reason is the question of a role of a City Architect in creating of contemporary image of a city. Gustav Oelsner was not only the administrator of problems connected with architecture. His social awareness and aesthetic sensitivity gave his vision of city development a timeless value, that makes Altona even now one of the most attractive parts of Hamburg. Oelsner’s life is a picture of dedication to architecture, but also a picture of complicated and difficult history of 20th century. He was persecuted because of his Jewish background and had to escape to Turkey during Second World War. What makes Oelsner particularly interesting in the history, is his brick architecture, original clinker façades that have no equivalent among other brick architecture works.

  • The Bridge of Knowledge – defining and implementing national Open Access policy by Polish universities. Gdansk University of Technology perspective
    • Anna Wałek
    • Magdalena Szuflita-Żurawska
    2017 Pełny tekst

    The European Commission states that Open Access to scientific resources funded by the European Union shall facilitate the use of research results financed from the public funds. Moreover, it will cause an increase in the innovative capacity of Europe. The Open Access landscape is determined by several factors such as mandates. The open mandate may be voluntary or mandatory and implemented at the institutional, national or international level. It requires scholars to use open repository to deposit results of scientific research financed from public resources. The current paper addresses the role of European Commission guidelines regarding dissemination of scientific results financed by the European Union budget together with recommendations at the national level for Polish universities. The process of preparing and implementing Open Access policy at the institutional level and the role of libraries in this process were presented on the example of Gdańsk University of Technology. Gdańsk University of Technology implements a project called Multidisciplinary Open System Transferring Knowledge. The acronym of its name in the Polish language is „MOST Wiedzy”, which means „the bridge of knowledge”. The result of this project is a platform of the same name, whose aim is to provide free access to the resources created and gathered at the University. The objective of the platform is to promote widely the research and educational potential of the University. It will also be a solution supporting communication tool between researchers and a platform for cooperation between science and business. The platform will be made available to other universities in the region of Pomerania in order to create common knowledge resources. The paper also discusses the strategy of promoting Open Access and the repository within the university, in the scientific community of the Pomerania region and among entrepreneurs.

  • The Bridge to Knowledge – Open Access to Scientific Research Results on Multidisciplinary Open System Transferring Knowledge Platform
    • Anna Wałek
    • Paweł Lubomski
    2017 Pełny tekst TASK Quarterly

    The European policy of Open Access to scientific research is now one of the key issues discussed in public debates on the future development of scientific communication. The implementation of Open Access tools has significant impact on scientific and economic growth. On the one hand, Open Access accelerates disseminating new research findings and facilitates recognition of authors on a more global scale. On the other hand, Open Access helps provide equal access to knowledge and stimulates innovation. Thus, it has an important role in creating the modern information society and economic growth. International organisations, the European Union and governments of individual countries support the idea of Open Access giving recommendations and guidelines concerning making the outputs of research financed from public funds freely available. The paper aims to discuss the process of preparing and implementing the Open Access policy at the institutional level as well as the functionality and tasks of the Open Repository which is now being established on the Multidisciplinary Open System Transferring Knowledge Platform. The acronym of its name in the Polish language is “MOST Wiedzy”, which means “Bridge of Knowledge”. The repository is a project of an archive of scientific publications, research data, scientific dissertations, as well as other documents and sources, created as a result of scientific experiments and other research and development work conducted at the Gdańsk University of Technology. It will also be a solution supporting communication between researchers and a platform for cooperation between science and business.

  • The central server of the Border Guard's distributed multimedia system for monitoring and visualisation of ongoing and archival events
    • Marek Blok
    • Sylwester Kaczmarek
    • Marcin Narloch
    • Maciej Sac
    2017 Journal of Marine Engineering and Technology

    The paper presents the architecture and functionalities of the central server (CENTER) of the distributed system for the Polish Border Guard (BG) for monitoring maritime areas. The overall system has been extended to incorporate, apart from map data, also different multimedia elements such as video from cameras or audio from telephone connections operated by BG units. This requires new system elements: Archive Servers for storing new types of data and Events Visualization Post for the presentation of new media along with the presentation of ongoing or archival tactical situations on maps. The paper focuses on new functionalities of the CENTER and integration of new elements with the rest of the system.

  • The Concept of a Methodology for Selecting the Optimal Parameters of Heat Received from a Nuclear Power Plant Operating in a Partial Cogeneration Mode
    • Tomasz Minkiewicz
    • Andrzej Reński
    2017 Pełny tekst Acta Energetica

    The paper presents the concept of the objective function which is to allow the selection of optimal parameters of the district heating system using a nuclear power plant operating in partial cogeneration mode. The concept is based on research carried out a number of years ago. The size of annual expenses was proposed as the objective function, which allows to compare the operation of a nuclear power plant in partial cogeneration with selected variants of supply to the heating system (combined heat and power station or conventional power plant and a conventional heating station). The analysis allows selecting the optimal structure of the heat supply system, which will provide the highest economic efficiency.

  • The concept of improving warehouse management in the X production company
    • Radosław Drozd
    • Marcin Kisielewski
    2017 Research in Logistics & Production

    The article aims at the presentation of a concept referring to the improvement of warehouse management in the X production plant. The authors suggest two solutions: using storage racks at the picking process site and warehouse automation. Ultimately, the authors of the article present their basic calculation of the costs, indicating the increase in efficiency after the implementation of the discussed improvements.

  • The concept of research on ecological, energy and reliability effects of modified marine fuel oils application to supply compression-ignition engines in real conditions
    • Zbigniew Korczewski
    • Jacek Rudnicki
    • Konrad Marszałkowski
    2017 Pełny tekst Combustion Engines

    Within the article, basic assumptions of the research project financed by Regional Fund for Environmental Protection and Water in Gdansk were described. The project concerns the experimental investigations carried out on laboratory compression-ignition engine in conditions of its supply with a non-standard marine fuel oil. Configuration and measuring capability of laboratory test bed presently being constructed were introduced. The concept of engine tests implementation as well as a general outline of research methodology was characterised. After being accepted by Polish Committee for Stardarization they could become an effective and efficient verification tool for various types of modified fuel oils introduced on the market, both for the maritime administration officies and shipyards as well as ship owners in operation.