Publications Repository - Gdańsk University of Technology

Page settings

polski
Publications Repository
Gdańsk University of Technology

Show publications from the year

Publications from the year 2014

Show all
  • The Effect of Welding Conditions on Mechanical Properties of Superduplex Stainless Steel Welded Joints
    • Aleksandra Świerczyńska
    • Jerzy Łabanowski
    • Dariusz Fydrych
    2014 Full text Advances in Materials Science

    The tests results of superduplex stainless steel welded joints made with a different heat input, using automatic submerged arc welding (SAW) and semi-automatic flux-cored arc welding (FCAW) have been presented. Metallographic examinations, the measurements of the ferrite content, the width of the heat affected zone (HAZ) and the hardness of the welds in characteristic areas have been performed. Significant differences in the amount of ferrite in the weld metal and in the heat affected zone microstructure of joints were found.

  • The Effect of Wood Provenance and Density on Cutting Forces While Sawing Scots Pine (Pinus sylvestris L.)
    • Daniel Chuchała
    • Kazimierz Orłowski
    • Anna Sandak
    • Jakub Sandak
    • Dusan Pauliny
    • Jacek Barański
    2014 Full text BIORESOURCES

    Several properties of wood including the cutting power requirements can be correlated to wood density. Therefore, according to the literature, the cutting power requirements (and/or cutting forces) could be computed as a function of the wood specific gravity. This research shows that such an approach, based solely on specific gravity, may be considered a rather rough and imperfect estimate of cutting power. Samples of Scots pine (Pinus sylvestris L.) wood from different provinces in Poland with varying densities were machined on a sash gang saw. The average cutting force versus average wood density (estimated with the standard gravimetric method) was calculated, and the local cutting forces correlated to the local wood density. The average values of the cutting forces measured at selected points along the sample’s length were calculated by linear regression to the X-ray absorbance (density) estimated by means of X-ray radiography.

  • The Electrical Drive Systems with the Current Source Converter
    • Marcin Morawiec
    • Zbigniew Krzemiński
    2014

    -

  • The experimental research on RC columns, loaded at sign-variable eccentricity
    • Piotr Korzeniowski
    • Tomasz Ulenberg
    2014

    The research focuses on testing the behaviour of the reinforced concrete columns compressed at a variable eccentricity. The fact of possible variable eccentricity in compressed columns is not considered in the current calculation procedures. The objective of the research was to examine whether indeed the load history has no impact and whether the reinforced concrete columns compressed at eccentric of variable sign could be analysed in the same manner as if loaded for the first time. The research in this article may have practical application.

  • The external walls of a passive building: A classification anddescription of their thermal and optical properties
    • Witold Lewandowski
    • Weronika LEWANDOWSKA-Iwaniak
    2014 ENERGY AND BUILDINGS

    This paper attempts a new classification of insulating materials from the perspective of their utility in thepro-ecological passive construction industry. The main criterion is the conductivity of thermal and solarenergy. Based on their ability to conduct or block fluxes of thermal and solar energy, six types of insulatingwalls are proposed. On the basis of this criterion there are traditional dividing walls (typical walls, wallinsulating materials, windows), energy-saving building materials (Trombe walls, transparent insulation,energy-saving windows) and materials of the future. This classification will facilitate the conscious andplanned development of the latter.These new-generation materials allow energy to be saved, but they also enable it to be harnessed fromsunlight (transparent insulation) and to store it, for example, in phase change materials. Combining thesematerials in hybrid solutions will provide fresh opportunities for the energy-saving building industry.Theoretical research into these six types of insulating material has enabled their properties and buildingutility to be formulated.

  • The Fate of BTEX Compounds in Ambient Air
    • Marta Słomińska
    • Piotr Konieczka
    • Jacek Namieśnik
    2014 CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY

    As a result of the industrialization and urbanization in the world, human pressure on the environment is intensifying, leading to detrimental changes in both biotic and abiotic compartments. One of the many consequences of this state of affairs is the increasing rate of emission into the atmosphere of volatile organic compounds, including the so-called BTEX (benzene, ethylbenzene, toluene, xylenes) compounds. The authors review the main sources of BTEX compounds in ambient air and the impact on the photochemistry and individual elements of the environment (water, air, soil, living organisms). Potential transport mechanisms, which include transpiration, distribution, bioaccumulation, biodegradation, are described. The authors present the characteristic mechanisms of radical reactions and gives a view on environmental fate of BTEX compounds in the atmosphere. The article comprises the concentration of BTEX compounds both in rural and industrial areas of different parts of world, showing the scale of existing emissions of BTEX compounds to the atmosphere.

  • The FEM analysis of pressure installation elements after simulated accidental overheating
    • Paweł Szabracki
    • Marcin Jaskólski
    • Tomasz Lipiński
    • Agnieszka Kaczmarek-Kacprzak
    2014

    The paper presents innovative analysis focused on the safety aspects of existing pressure installation operation after overheating accidents. Results presented here can be applied in decision-making process concerning further operation of existing pressure installation after cooling system failure. In this paper the results of FEM analysis performed for a straight pipe and 90 degrees elbow, made of super duplex stainless steel, for initial microstructure (microstructure after manufacturing) and after precipitation of sigma phase (sigma), were presented. Heat treatment conditions simulate accidental overheating that can occur in nuclear power plants after primary cooling circulation fails. For initial and thermally modified microstructure, a tensile test was performed experimentally and numerical description of work hardening curves was done. The paper concerns the applicability of microstructure properties after simulated overheating accidents for analysis of existing pressure installation elements. Verification of FEM results was performed on the basis of empirical equations describing circumferential stresses in straight pipe. Stress distribution and deformation in both geometries reveals areas with highest risk of damage in pressure installation. According to the results of presented calculations, after simulated accidental overheating of existing pressure installation elements, changes of acceptable internal pressure were observed.

  • The finite-difference simulation of x-rays propagation through a system of lenses
    • Sergei Kshevetskii
    • Paweł Wojda
    2014

    The propagation of X-ray waves through an optical system consisting of 33 aluminum X-ray refractive lenses is considered. For solving the problem, a finite-difference method is suggested and investigated. It is shown that very small steps of the difference grid are necessary for reliable computation of propagation of X-ray waves through the system of lenses. It is shown that the wave phase is a function very quickly increasing with distance from an optical axis, after the wave has propagated through the system of lenses. If the phase is a quickly increasing function, then the wave electric field is a quickly oscillating function. We suggest and recommend using the equation for a phase function instead of the equation for an electric field. The equation for a phase function is derived.

  • The first International Comparative Social Enterprise Models Working Paper: Poland
    • Marzena Starnawska
    • Anna Ciepielewska-Kowalik
    • Bartek Pieliński
    • Aleksandra Szymańska
    2014

    In this paper, social enterprise models: entrepreneurial nonprofit organizations, cooperatives and vocational enterprises for the disabled are presented. Their emergence and institutionalization in the Polish social enterprise organizations landscape is provided and analysed. Also, the authors point to the convergences and divergences between these three models. Additionally historical background and institutional trajectories are provided for each model.

  • The health impact of urban parks along waterways
    • Monika Trojanowska
    2014

    Well designed parks along waterways could promote health and well-being of local inhabitants. The way the human settlements meet water bodies can influence the habits of local population. How people spend their time have significant impact on their health. For example, a team of Japanese scientists has proven that a well designed walk-able green spaces are crucial for the longevity of elderly citizens (Takano T. et al, 2002). Nature has properties that can stimulate mental and physical restoration, and even initiate natural processes of healing (Health Council of the Netherlands,2004; Sternberg, 2010). The water-bodies have innate soothing qualities, while proper park design can stimulate physical activities. Even moderate levels of activity decrease the effects of sedentary lifestyle and mitigate modern health concerns. The idea of biophilic city might be applied to cities along the waterways, as the waterfronts provide the possibility to integrate nature directly into human lives and bind the green infrastructure with streets connective network. (Beatley T. 2011, www.biophilicities.org). Moreover, public green space, including waterfront parks, can be used to address the issues of social inequality. Low income areas are often deprived of high quality green space (CABE, London 2010). The public parks along waterways could bridge the natural environment and the diverse population of town dwellers. The linear parks could extend to connect different neighborhoods, thus enhancing the creation of bridging social capital. The interesting question may be how to transform modern waterfronts into friendly walk-able green public spaces. The quest for therapeutic landscapes is a relatively new landscape design approach that could be applied to urban design. The experience of healing gardens in healthcare settings might provide a helpful tool. Their design was at the beginning a trial and error method, but gradually became more scientifically proven, and nowadays many guidelines are available. Examples of waterfronts and their health promoting effects will be discussed. The interviews and statistic data will be described. The article will provide guidelines and points for further discussion.

  • The Hybrid Fuzzy - SOEKS Approach to the Polish Internet Mortgage Market
    • Aleksander Orłowski
    • Edward Szczerbicki
    2014 Full text Procedia Computer Science

    The paper presents the hybrid fuzzy- SOEKS approach to the Polish Internet mortgage market, which is treated as an example of a fast changing market. Firstly, the market and market problems are described. Then, the first approach to the market problems is presented: the complete fuzzy model which was built basing on the rules. The fuzzy model is presented on one real data case. Next, the new approach, called Set of Experience Knowledge Structure (SOEKS) is adopted and presented basing on the same data. Instead of using data stored in the rules (fuzzy model), the market is presented using the experience stored in SOEKS. Finally, both approaches are compared with regard to their respective advantages and disadvantages, and some future works are described.

  • The hydrodynamic pressure field of the ship Zodiak, measurements and calculations
    • Jan Bielański
    2014 Full text HYDROACOUSTICS

    The article presents the results of measurements of the slowly changing hydrodynamic pressure field HPF generated by the movement of the ship, Zodiak, in the Bay of Gdansk. The measurement results have been obtained in the framework of the program of the work in Siramis, under the auspices of the European Defence Administration of the EU, by the research team of the Naval Academy in Gdynia. The measurement results were compared with the results of the calculations using the boundary element method as distribution singularities on the vessel surface and at the bottom of the sea. Also used, in part, were HPF measurements carried out for the ships Kapitan Poinc and Quest, made by the same research team. The results of the measurements made it possible to verify the analytical model for calculating HPF. Then, calculations were made with HPF dimensionless characteristics depending on the ship's speed, the depth of the sea and the distance from the plane of symmetry of the ship.

  • The idea of a robotic single-sided lapping system
    • Norbert Piotrowski
    • Adam Barylski
    2014 Archiwum Technologii Maszyn i Automatyzacji

    This paper reviews the idea of a robotic lapping system. Robot’s assistance automates the lap-ping process and supports the development of a flexible lapping system. However, the main aim behind the idea of a robotic lapping system is to provide improved means for controlling the posi-tion of conditioning rings on a lapping plate. Due to the kinematics of lapping process, the profile wear of the tool is not constant along the radius. Changing the kinematic parameters, e.g. position of the conditioning ring with the working elements or rotational velocities of the lap and the ring can be used for correction of surface’s profile in the lap as well as for avoiding undesirable con-vexity or concavity. Lapping plate flatness has an essential influence on the shape accuracy of lapped surfaces. Flatness of the lap during its contact with the abrasive grain in the lapping process was studied.

  • The II phase metabolism of endogenous and exogenous compounds, including antitumor chemotherapeutics
    • Zofia Mazerska
    • Anna Mróz
    • Anna Bejrowska
    • Barbara Borowa-Mazgaj
    • Agnieszka Potęga
    • Ewa Augustin
    2014

    The II phase metabolism, it is a set of metabolism and excretion pathways of endogenous as well as exogenous compounds including xenobiotics. UDP-glucuronyltransferases (UGTs; EC 2.4.1.17) are the most crucial representatives of II phase enzymes, which are responsible for the transformation of bilirubine and bile acids, steroids and thyroid hormones and lipids. Exogenous compounds, including drugs, carcinogens, environmental pollutants and nutrient components are also the substrates of UGTs. Deactivation of xenobiotics and the following excretion of hydrophilic conjugates is the main task of glucuronidation [1]. However, one can found glucuronides of comparable or even higher reactivity than that of the native compound. For example, morphine 6-O-glucuronide, and glucuronides of retinoids and nonsteroid anti-inflammatory drugs represent the group of active glucuronides [2]. Nearly 35% of all drugs are metabolized by UGTs. Major sites of these reaction include the liver, intestine and kidney. There were found 22 functional UGT isoforms that belong to 5 subfamilies (UGT1A, 2A, 2B, 3A and 8A). Among variety of drugs conjugated by UGTs, anticancer agents are of special interest, because of the reported differences in UGT expression in normal and tumour tissues. On the other hand, glucuronidation may also represent a mechanism of intrinsic drug resistance, as it was observed for irinotecan and methotrexate glucuronides in colon and breast cancer, respectively [3]. It has also been shown that new types of glucuronides would play a role of prodrugs, that are hydroxylyzed selectively in tumour cells [4]. Studies of our group indicated that triazolo- and imidazoacridinone antitumor agents, C-1305 and C- 1311 were glucuronidated with human liver and intestine microsomes and selectively with UGT1A10 isoform in vitro [5]. Furthermore, C-1305 glucuronide gave higher cytotoxicity than the parent drug [6]. We also demonstrated that another acridine antitumor agent, C-1748, was transformed to specific glucuronide on aliphatic hydroxyl group. Furthermore, our current results indicate that the studied antitumour acridines are able to modulate enzymatic activity of UGT. In conclusion, we demonstrated that not only drug metabolism but also drug-drug interactions should be considered in the design of acridine mediated antitumor therapy in combination with other chemotherapeutics.

  • The impact of domestic and foreign competition on sectoral growth: a cross-country analysis
    • Joanna Wolszczak-Derlacz
    2014 BULLETIN OF ECONOMIC RESEARCH

    This paper examines the impact of competition on the total factor productivity (TFP) of 21 manufacturing sectors in eighteen OECD countries over the period of time 1990–2006. We assume that the source of TFP growth can be either domestic or foreign innovation or technology transfer from the technological frontier. Trade openness, R&D, and human capital can have two effects: a direct effect on TFP (e.g., through innovation) and an indirect effect depending on the productivity gap between a given country and the technological frontier. We find that tougher domestic competition is always associated with higher sectoral productivity. Both import and export penetrations are positively associated with an increase of TFP. However, the channels through which higher TFP is materialized are different: export penetration works through level effect, while import penetration acts mainly when conditional on the level of technological development. The economical magnitude of the effect is not trivial

  • The Impact of EU Funds on the Development of Business Environment Institutions – Research Results in Pomeranian Voivodeship in Poland
    • Anna Lis
    2014

    The paper presents the main findings of the research conducted to assess the impact of EU funds on development of business environment infrastructure in Pomeranian Voivodeship in Poland, and – indirectly – on the growth of the innovation capacity of Pomeranian entrepreneurs. The research shows that support of ROP PV 2007-2013 contributed to the creation of multifunctional business infrastructure throughout the Pomorskie Voivodship, which allows to support entrepreneurs in their business activities, but only a very small share of entrepreneurs takes advantage of the services offered by business environment institutions. Furthermore – according to research – links with bridging institutions do not seem to lead to a significant increase the innovation capacity of firms. The obtained findings allow to evaluate the effects of support of bridging institutions with public funds, and thus to better prepare for the new programming period.

  • The impact of methods the stochastic analysis on swimming safety of multihull floating units (Part 2)
    • Agnieszka Królicka
    2014 Logistyka

    In part 2 the equations of the catamaran motion were divided into the system of two groups not conjugated with themselves containing the mutually conjugated equations. The feedback is obtained by the linear and nonlinear coefficients of dampening and coefficients of hydrostatic elasticity. The first group includes the symmetric movements (longitudinal movements), and the second group includes the antisymmetric movements (transverse). There were written the equations of forces “ ” excitations for symmetric and antisymmetric movements. The mathematical model of the dynamic system was described by the equations of the state for the antisymmetric movements of the catamaran, which include the transverse oscillation - sway, rolling and the so-called yawing

  • The impact of methods the stochastic analysis on swimming safety of multihull floating units (Part1)
    • Agnieszka Królicka
    2014 Logistyka

    The presented article concerns the application of the methods of the stochastic analysis to solve differential equations for multihull catamaran-type floating unit. There was described the continuous process of Markov and the method of equations of Focker-Planck-Kolmogorov. The analysis of dynamics of the multihull unit was carried out with the assumption that the system model is the linear model with six degrees of freedom, on which there operates the irregular wave. Multihull unit with a rigid structure sails with a fixed forward speed V 0 . The equations of the catamaran motion were divided into the system of two groups not conjugated with themselves containing the mutually conjugated equations. The feedback is obtained by the linear and nonlinear coefficients of dampening and coefficients of hydrostatic elasticity. The first group includes the symmetric movements (longitudinal movements), and the second group includes the antisymmetric movements (transverse). There were written the equations of forces “ oˆ It ” excitations for symmetric and antisymmetric movements. The mathematical model of the dynamic system was described by the equations of the state for the antisymmetric movements of the catamaran, which include the transverse oscillation - sway, rolling and the so-called yawing. These equations are presented in part 2.

  • The impact of organizational culture on employees' decisions on the selection of bibycles as a form of transportation to work , in the context of creating a new culture for urban mobillity, based on an example of three IT companies located in Gdansk
    • Romanika Okraszewska
    2014 Logistyka

    Celem artykułu jest wskazanie relacji między kulturą organizacyjną pracodawcy a wyborami transportowymi pracowników. Prowadzone w artykule rozważania odwołują się do modelu kultury organizacyjnej E. Scheina, w którym według kryterium postrzegania przez postronnego obserwatora wyróżnione zostały trzy poziomy: artefakty, wartości i założenia. Przeprowadzone w trzech firmach badania ankietowe, wsparte informacjami z wywiadów osobistych, dowodzą, że w przypadku jednoczesnego występowania odmiennych wartości na pierwszym i drugim poziomie modelu kultury organizacyjnej Scheina, wartości mają silniejszy wpływ na wybory transportowe pracowników niż artefakty. Uwzględnienie uzyskanych wyników może stanowić wartość dodaną w procesie tworzenia planów mobilności.

  • The impact of slowly biodegradable organic compounds on the oxygen uptake rate in activated sludge systems
    • Jakub Drewnowski
    2014 WATER SCIENCE AND TECHNOLOGY

    The hydrolysis process of slowly biodegradable substrate (Xs) have impact on the efficiencies of nutrient removal in activated sludge systems. Measurement of OUR and corresponding COD is accepted as a very useful tool to reflect the consumption of biodegradable substrates. The influence of the readily biodegradable substrate (Ss) in biological wastewater treatment systems has been extensively investigated, but little is known about the impact of Xs. The aim of this study was to determine the immediate effects of particulate and colloidal (Xs) biodegradable compounds on oxygen utilization for a full-scale process mixed liquor from large WWTP located in northern Poland. Since it is difficult to distinguish Xs in direct way, a novel procedure, based on the standard batch tests, was developed and run in parallel reactors with settled wastewater (SWW) and pretreated SWW sample. Two types of aerobic OUR tests with low and high substrat/biomass (So/Xo ratio) concentration, were carried out with the SWW without pretreatment and pretreated with coagulation-flocculation (C-F) method. The removal of colloidal and particulate fractions by C-F resulted in the reduced process rates. The major discrepancy in the rate reductions (over 300% referred to the OURmax) were observed during OUR batch test with high So/Xo ratio.