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Repozytorium publikacji
Politechniki Gdańskiej

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  • INTERDYSCYPLINARNOŚĆ W EDUKACJI STUDENTÓW ARCHITEKTURY. NA PRZYKŁADZIE BADANIA ZJAWISK WIATROWYCH W ŚRODOWISKU ZABUDOWANYM
    • Katarzyna Zielonko-Jung
    2019

    Celem artykułu jest prezentacja możliwości włączenia badań w zakresie aerodynamiki w proces kształcenia studentów wydziałów architektury. Opisano metodę pracy ze studentami uwzględniającą badania eksperymentalne w tunelu aerodynamicznym. Pozwala ona na rozpoznanie charakteru badanych zjawisk oraz na szersze spojrzenie na interdyscyplinarność w projektowaniu architektonicznym.

  • Inter-governmental Collaborative Networks for Digital Government Innovation Transfer -Structure, Membership, Operation
    • Magdalena Ciesielska
    • Tomasz Janowski
    2019 Pełny tekst

    Digital government refers to the transformation of government organizations and their relationships with citizens, business and each other through digital technology. It entails digital innovation in processes, services, organizations, policies, etc. which are increasingly developed and tested in one country and transferred, after adaptation, to other countries. The process of innovation transfer and the underlying information and knowledge sharing increasing take place through networks. The aim of this study is to identify various forms of such networks, their structures, membership criteria and modes of operation. The study relies on the analysis of literature on innovation transfer, collaborative networks and inter-governmental collaboration, and a survey of existing inter-governmental networks for digital government innovation transfer. The key finding is that such networks are a growing form of international collaboration and an instrument in global economy.

  • INTERNATIONALIZATION OF ENTERPRISES IN KAZAKHSTAN AS AN EXAMPLE OF INTERNATIONALIZATION PATTERNS IN THE AREA OF THE EURASIAN ECONOMIC UNION.
    • Inna Suchkova
    2019

    The article aims to show the specificity of the internationalization of Kazakh enterprises, in particular, the pace, scope, intensity, and forms of their internationalization in the Eurasian Economic Union (EEU). The EEU is a relatively young grouping that was established in 2015 by the Republic of Armenia, the Republic of Belarus, the Republic of Kazakhstan, the Kyrgyz Republic and the Russian Federation. EEU creators try to give the Eurasian integration process a different direction in contrast to the structures that were created in the post-Soviet space, namely, they want use experience form European Union integration. In this paper is shown the most important effects of international economic integration, and in particular the functioning of the Eurasian Economic Union (EEU) and characterizes the economy of Kazakhstan. Furthermore, the research conducted on exporters operating on the territory of the Republic of Kazakhstan, were shown. The research sample is 108 companies including 32 small & micro (<100 employees), 33 medium (101-250 employees) and large (>250 employees), resulting in median transnationalization index at 13.3. This shows still poor internationalization, however it is growing year to year.

  • Internationalization patterns of Polish family high-tech firms
    • Nelly Daszkiewicz
    2019 Pełny tekst Entrepreneurial Business and Economics Review

    The objective of the article is to explore internationalisation patterns of family high-tech firms, especially their internationalisation motives, intensity, speed, and entry modes. The empirical part adopts a quantitative approach. The results of the survey are presented on the sample of 263 high-tech production firms from Poland, including 101 family firms. The survey was conducted in all 16 Polish regions. The calculations from obtained survey results were made using Statistica PL 10.

  • Interpretable Deep Learning Model for the Detection and Reconstruction of Dysarthric Speech
    • Daniel Korzekwa
    • Roberto Barra-Chicote
    • Bożena Kostek
    • Thomas Drugman
    • Mateusz Łajszczak
    2019 Pełny tekst

    We present a novel deep learning model for the detection and reconstruction of dysarthric speech. We train the model with a multi-task learning technique to jointly solve dysarthria detection and speech reconstruction tasks. The model key feature is a low-dimensional latent space that is meant to encode the properties of dysarthric speech. It is commonly believed that neural networks are black boxes that solve problems but do not provide interpretable outputs. On the contrary, we show that this latent space successfully encodes interpretable characteristics of dysarthria, is effective at detecting dysarthria, and that manipulation of the latent space allows the model to reconstruct healthy speech from dysarthric speech. This work can help patients and speech pathologists to improve their understanding of the condition, lead to more accurate diagnoses and aid in reconstructing healthy speech for afflicted patients.

  • Introduction to MIP synthesis, characteristics and analytical application
    • Mariusz Marć
    • Piotr Paweł Wieczorek
    2019

    One of the trends in analytical chemistry is associated with designing and developing new types of sample preparation techniques, which might significantly increase the efficiency and selectivity of the analytes isolation or/and preconcentration process. One of the most widely employed solutions are selective sorption materials, defined as molecularly imprinted polymers (MIPs), as well as the sorbents with the molecular fingerprint. Due to their simple preparation protocol, mechanical, thermal and chemical stability and selectivity, MIPs have found application as a stationary phase in separation techniques such as liquid chromatography or capillary electrophoresis, in electrochemical sensors or as a specific sorption medium in solid phase extraction (SPE) technique. The preparation of a new type of polymer material is based on a specific template molecule using selected polymerization technique and characterization of the morphological and physicochemical properties of the obtained MIP. At the end, the studies which concern the suitability and usability of the obtained MIP material under real conditions, i.e. in the analysis of environmental samples (selectivity and efficiency of the isolation and/or preconcentration of analytes from environmental samples characterized by the complex matrix) should be performed. The following chapter contains the basic information about the MIP preparation protocols and potential fields of application of these selective sorption materials in analytical and environmental chemistry.

  • Inverse and forward surrogate models for expedited design optimization of unequal-power-split patch couplers
    • Sławomir Kozieł
    • Adrian Bekasiewicz
    2019 Pełny tekst Metrology and Measurement Systems

    In the paper, a procedure for precise and expedited design optimization of unequal power split patchcouplers is proposed. Our methodology aims at identifying the coupler dimensions that correspond to thecircuit operating at the requested frequency and featuring a required power split. At the same time, thedesign process is supposed to be computationally efficient. The proposed methodology involves two typesof auxiliary models (surrogates): an inverse one, constructed from a set of reference designs optimized forparticular power split values, and a forward one which represents the circuit S-parameter gradients as afunction of the power split ratio. The inverse model directly yields the values of geometry parameters ofthe coupler for any required power split, whereas the forward model is used for a post-scaling correction ofthe circuit characteristics. For the sake of illustration, a 10-GHz circular sector patch coupler is considered.The power split ratio of the structure is re-designed within a wide range of

  • Inverse heat transfer problem solution of sounding rocket using moving window optimization
    • Adam Dąbrowski
    • Leszek Dąbrowski
    2019 Pełny tekst PLOS ONE

    An Inverse Heat Transfer Problem is solved for a sounding rocket module given its geometry and measured temperature profile. The solution is obtained via moving window optimization, a technique for solving inverse dynamics. An analysis is performed to modify the method to avoid oscillatory behavior of the resulting heat flux profile. The method parameters are tuned in relation to characteristic phases of the flight. Results are presented and correlated with measured flight data. Conclusions are drawn for better experiments for measuring heat flux on a sounding rocket skin.

  • Investigation of optical properties of Infitec and Active Stereo stereoscopic techniques for CAVE-type virtual reality systems
    • Adam Mazikowski
    2019 Pełny tekst Metrology and Measurement Systems

    In recent years, many scientific and industrial centres in the world developed virtual reality systems or laboratories. At present, among the most advanced virtual reality systems are CAVE-type (Cave Automatic Virtual Environment) installations. Such systems usually consist of four, five, or six projection screens arranged in the form of a closed or hemi-closed space. The basic task of such systems is to ensure the effect of user “immersion” in the surrounding environment. The effect of user “immersion” into virtual reality in such systems is largely dependent on optical properties of the system, especially on quality of projection of three-dimensional images. In this paper, techniques of projection of three-dimensional (3D) images in CAVE-type virtual reality systems are analysed. The requirements of these techniques for such virtual reality systems are outlined. Based on the results of measurements performed in a unique CAVE-type virtual reality laboratory equipped with two different 3D projection techniques, named Immersive 3D Visualization Lab (I3DVL), that was recently opened at the Gdańsk University of Technology, the stereoscopic parameters and colour gamut of Infitec and Active Stereo stereoscopic projection techniques are examined and discussed. The obtained results enable to estimate the projection system quality for application in CAVE-type virtual reality installations.

  • Investigation of the Combustion Processes in the Gas Turbine Module of an FPSO Operating on Associated Gas Conversion Products
    • Oleksandr Cherednichenko
    • Serhiy Serbin
    • Marek Dzida
    2019 Pełny tekst Polish Maritime Research

    In this paper, we consider the issue of thermo-chemical heat recovery of waste heat from gas turbine engines for the steam conversion of associated gas for offshore vessels. Current trends in the development of offshore infrastructure are identified, and the composition of power plants for mobile offshore drilling units and FPSO vessels is analyzed. We present the results of a comparison of power-to-volume ratio, power-to-weight ratio and efficiency for diesel and gas turbine power modules of various capacities. Mathematical modeling methods are used to analyze the parameters of an alternative gas turbine unit based on steam conversion of the associated gas, and the estimated efficiency of the energy module is shown to be 50%. In the modeling of the burning processes, the UGT 25000 serial low emission combustor is considered, and a detailed analysis of the processes in the combustor is presented, based on the application of a 35-reaction chemical mechanism. We confirm the possibility of efficient combustion of associated gas steam conversion products with different compositions, and establish that stable operation of the gas turbine combustor is possible when using fuels with low calorific values in the range 7–8 MJ/kg. It is found that the emissions of NOx and CO during operation of a gas turbine engine on the associated gas conversion products are within acceptable limits.

  • Investigation of the temperature modulation parameters on semiconductor gas sensor response
    • Łukasz Woźniak
    • Paweł Kalinowski
    • Grzegorz Jasiński
    • Piotr Jasiński
    2019

    In this work we present the results of the investigation of the sensing properties of semiconductor gas sensors with a sinusoidally modulated temperature in the presence of synthetic air (SA) and three volatile air pollutants, i.e. NH3, NO2 and SO2. The measurements were performed for different average sensor heater temperatures and the amplitude of the modulation signal. In addition, the extraction of features from the sensor response using FFT analysis was performed. The results were compared with the results obtained by approach in which the sensors were supplied with a constant value of the heater voltage. The significance of the amplitudes of higher harmonics in the FFT signal was examined in relation to the parameters of modulating signal of the sensor. The goal of this study is to investigate the performance of sensor under different ranges of the working temperature.

  • Investigation of the thermal effects in water-lubricated journal bearings with axial grooves
    • Michał Wodtke
    • Wojciech Litwin
    2019

    Water-lubricated hydrodynamic journal bearings are frequently applied as stern tube bearings due to their advantages over other bearing types. They are environmentally friendly, can operate without sealings and in conditions of low friction losses. The most popular are bearings with open axial grooves, which require, for proper operation, forced axial flow of the lubricating water. Correctly designed and operated stern tube bearings can successfully work in the fluid friction regime. The dynamic viscosity of water is relatively low compared to oil. This results in smaller minimum film thickness and lower ability to carry the load for water-lubricated bearings in comparison to oil-lubricated bearings under similar operating conditions. This is considered as a disadvantage of this bearings type. However, at the same time, the lower water viscosity limits the temperature rise in the lubricating film and reduces friction losses. For this reason, it is common practice to not include thermal effects in the theoretical analysis of water lubricated bearings and to assume an isothermal flow in the gap. On the other hand, it is known from such bearings exploitation that they can fail due to overheating, resulting in melting of polymer material of the bush. Experimental tests of water-lubricated bearings with polymeric bushes have shown that the gradual reduction of axial water flow often results in excessive temperature rise. However, this was not valid for all tested bearing materials. In this paper, an investigation of thermal effects accompanying operation of water-lubricated journal bearing is presented. For this purpose, numerical bearing model was developed using FSI (Fluid-Solid Interaction) simulation. It allowed to take into account complexity of the important phenomena for the hydrodynamic performance of the bearing, as for example: heat generation in the fluid film due to shearing, deformations of the bush or forced axial water flow. A water-lubricated bearing from theoretical investigation was also tested experimentally with the use of a full-scale test stand. Experimental investigations under limited axial water flow through the bearing revealed significant rise of the measured temperature of the bush. Measured amount of the heat generated in the bearing friction zone was much higher compared to calculated values. ture rise and enlarged heat generation.

  • Investigation of Thermoplastic Polyurethanes Synthesized via Two Different Prepolymers
    • Paulina Kasprzyk
    • Ewelina Sadowska
    • Janusz Datta
    2019 Pełny tekst JOURNAL OF POLYMERS AND THE ENVIRONMENT

    The man aim of this work was to investigate the effect of the molecular weight of polyols, mixture of prepolymers, and [NCO]/[OH] molar ratio used during the prepolymer chain extending step on the chemical structure, thermomechanical and mechanical properties, and thermal stability of thermoplastic poly(ether-urethane)s In this work thermoplastic poly(ether-urethane)s were synthesized by using polyols with a various molecular weight, 4,4′-diphenylmethane diisocyanate and bio-based glycol. Materials were obtained by a two-step method. The tests were carried out for polyurethanes obtained from a mixture of prepolymers and for reference samples. In the case of materials obtained with using mixture of prepolymers, the ratio of both prepolymers was determined on 50/50 weight percent. Soft segments of materials prepared with using mixture consist of two different polyols. The chemical structure was analyzed using FTIR spectroscopy. The Gaussian deconvolution technique was used to study the hydrogen bonding as well as to decompose carbonyl region of three peaks in various TPUs. The thermal degradation behavior was investigated by using thermogravimetric analysis at heating rates of 10 °C/min. It was confirmed that the mixture of prepolymers has an effect of the degree of phase separation, thermal stability and selected properties of synthesized thermoplastic poly(ether-urethane)s.

  • Investigation of Weigh-in-Motion Measurement Accuracy on the Basis of Steering Axle Load Spectra
    • Dawid Ryś
    2019 Pełny tekst SENSORS

    Weigh-in-motion systems are installed in pavements or on bridges to identify and reduce the number of overloaded vehicles and minimise their adverse eect on road infrastructure. Moreover, the collected trac data are used to obtain axle load characteristics, which are very useful in road infrastructure design. Practical application of data from weigh-in-motion has become more common recently, which calls for adequate attention to data quality. This issue is addressed in the presented paper. The aim of the article is to investigate the accuracy of 77 operative weigh-in-motion stations by analysing steering axle load spectra. The proposed methodology and analysis enabled the identification of scale and source of errors that occur in measurements delivered from weigh-in-motion systems. For this purpose, selected factors were investigated, including the type of axle load sensor, air temperature and vehicle speed. The results of the analysis indicated the obvious eect of the axle load sensor type on the measurement results. It was noted that systematic error increases during winter, causing underestimation of axle loads by 5% to 10% for quartz piezoelectric and bending beam load sensors, respectively. A deterioration of system accuracy is also visible when vehicle speed decreases to 30 km/h. For 25% to 35% of cases, depending on the type of sensor, random error increases for lower speeds, while it remains at a constant level at higher speeds. The analysis also delivered a standard steering axle load distribution, which can have practical meaning in the improvement of weigh-in-motion accuracy and trac data quality.

  • Investigation on Mode I Fracture Behavior of Hybrid Fiber-Reinforced Geopolymer Composites
    • Neha P. Asrani
    • G. Murali
    • Hakim Abdelgader
    • K. Parthiban
    • M. K. Haridharan
    • K. Karthikeyan
    2019 Pełny tekst ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING

    Recent reports in the literature have shown that fber-reinforced geopolymer composites (FRGC) made with monofbers exhibit a signifcant enhancement in fracture energy. However, many aspects of the fracture performance of hybrid fberreinforced geopolymer composites (HFRGC) remain largely unexploited, and these are predominant for the structures. For the frst time, the mode I fracture energy of HFRGC is investigated. The mode I behavior was assessed using pre-notched beams in accordance with the RILEM three-point bending test. Five diferent HFRGC mixtures were prepared using three fber types: steel, polypropylene and glass (SF, PF and GF). The parameters of the pre-notched beam in fexure tested in this study were the frst crack and peak load, crack mouth opening displacement at the frst crack load and peak load, equivalent tensile strength, post-peak slope, reinforcing index, residual tensile strength and fracture energy. The results reveal that there is a positive interaction amidst the fbers in geopolymer composites that leads to an enhancement in the mode I fracture energy compared to the reference specimen. This study probes the infuence of novel HFRGC while producing high-quality concrete, which can then be leveraged for sustainable infrastructure and various civil engineering works.

  • Investigations of size effect in concrete at aggregate level - experiments and calculations results using discrete element method
    • Jan Suchorzewski
    2019 Pełny tekst

    Size effect is a fundamental phenomenon in concrete. It is characterised by decreasing strength and increasing brittleness of concrete with increasing size. The thesis includes experimental and theoretical elements. The main goal of the thesis were investigations of a size effect at the aggregate level by taking fracture into account with the discrete element method (DEM) for various failure modes. Comprehensive experiments on a size effect were carried out for a tensile splitting test. In experiments, the micro-computed tomography (micro-CT) and digital image correlation (DIC) technique were used. DEM for concrete was calibrated with the aid of simple uniaxial tests of uniaxial compression and uniaxial tension. In numerical calculations with the real internal concrete structure, the distribution and evolution of inter-particle contacts, inter-particle forces, force chains, rotations, broken contacts and energies was analyzed (depending on the specimen size) for various failure mechanisms: quasi-brittle, brittle and very brittle (snap-back). Experimental results were directly compared with experiments. Good agreement was achieved. In addition, comprehensive size effect experiments on reinforced concrete beams under bending without and with stirrups were carried out that were scaled along the height or length.

  • Ion conduction in beryllium-alumino-silicate glasses doped with sodium or sodium and lithium ions
    • Natalia Wójcik
    • Piotr Kupracz
    • Ryszard Barczyński
    • B Jonson
    • S Ali
    2019 Pełny tekst SOLID STATE IONICS

    Electrical properties of beryllium-alumino-silicate glasses containing sodium ions or sodium and lithium ions were studied with impedance spectroscopy technique over a frequency range from 10 mHz to 1 MHz and at temperature range from 213 to 473 K. The frequency- and temperature-dependent conductivity spectra of individual single alkali glasses were superimposed by means of the Summerfield scaling. Mixed-alkali glasses do not overlap into a single master curve. Glasses doped with sodium ions exhibit significantly higher values of D.C. conductivity and lower activation energy (~0.63 eV) than glasses doped with both sodium and lithium ions (~0.95 eV). The observed mixed-alkali effect can be described by the dynamic structure model (DSM). The conductivity pre-exponential factors and activation energy follow the Meyer-Neldel rule in both glass series. It was observed that the replacement of SiO2 by BeO in single cation glasses resulted in decrease in activation energy and pre-exponential factor σ0. In mixed cations glasses similar effect found for D.C. conduction process parameters was assigned to influence of both oxides BeO and Al2O3.

  • Ionic conductivity behavior by activated hopping conductivity (AHC) of barium aluminoborosilicate glass–ceramic system designed for SOFC sealing
    • M Da
    • W Pontuschka
    • J Bartolomé
    • Piotr Jasiński
    • Jakub Karczewski
    • Signo Reis
    2019 JOURNAL OF THE EUROPEAN CERAMIC SOCIETY

    Non-conducting BaO-B2O3-Al2O3-SiO2 parent glasses designed for solid oxide fuel cell (SOFC) sealing applications were prepared using the melt-quenching technique. The glass formation region was determined according to phase equilibrium relations and was found to be in the composition range 70BaO-(x)Al2O3-(10−x)B2O3-20SiO2 where 3.0 < x < 6.0 wt%. The conductivity values obtained conductivity ranged from 10−5 to 10−10 S/cm at temperatures between 600 and 850 °C. The batch compositions presented a threshold of dc conductivity near 70BaO wt% with a quasi linear behavior with the decrease of the BaO content. Different values of conduction activation energy were observed at temperatures above the glass transition temperature (Tg) (up to 700 °C), which were attributed to the thermal bond-breaking of non-bridging oxygen (NBO) defects. The experimental results of the electrochemical characterization by impedance spectroscopy of glass–ceramic interfaces with yttria-stabilized zirconia (YSZ) acting as solid ionic conductor electrolyte are presented and discussed.

  • Iridium 5d -electron driven superconductivity in ThIr3
    • Karolina Górnicka
    • Debarchan Das
    • Sylwia Gutowska
    • Bartłomiej Wiendlocha
    • Michał Winiarski
    • Tomasz Klimczuk
    • Dariusz Kaczorowski
    2019 Pełny tekst PHYSICAL REVIEW B

    A polycrystalline sample of superconducting ThI r 3 was obtained by arc-melting Th and Ir metals. Powder x-ray diffraction revealed that the compound crystalizes in a rhombohedral crystal structure (R-3m, s.g. #166) with the lattice parameters: a = 5.3394 ( 1 ) Å and c = 26.4228 ( 8 ) Å . Normal and superconducting states were studied by magnetic susceptibility, electrical resistivity, and heat capacity measurements. The results showed that ThI r 3 is a type-II superconductor (Ginzburg-Landau parameter κ = 38 ) with the critical temperature T c = 4.41 K . The heat capacity data yielded the Sommerfeld coefficient γ = 17.6 mJ / ( mo l K 2 ) and the Debye temperature Θ D = 169 K . The ratio Δ C / ( γ T c ) = 1.6 , where Δ C stands for the specific heat jump at T c , and the electron–phonon coupling constant λ e − p = 0.74 suggest that ThI r 3 is a moderate-strength superconductor. The experimental studies were supplemented by band structure calculations, which indicated that the superconductivity in ThI r 3 is governed mainly by 5 d states of iridium. The significantly smaller band-structure value of Sommerfeld coefficient as well as the experimentally observed quadratic temperature dependence of resistivity and enhanced magnetic susceptibility suggest the presence of electronic interactions in the system, which compete with superconductivity.

  • Iron(III)-selective materials based on a catechol-bearing amide for optical sensing
    • Natalia Łukasik
    • Ewa Wagner-Wysiecka
    • Aleksandra Małachowska
    2019 Pełny tekst ANALYST

    The synthesis and ion-binding properties of a new amide L derived from 3,4-dihydroxybenzoic acid are described. Due to the presence of a catechol unit, the compound interacts selectively with iron(III) in organic solvent (dimethyl sulfoxide, DMSO) to produce a color change from pale yellow to green. The incorporation of the ligand L into polymeric matrices or its encapsulation into surfactant-based spheres enables analyte detection in aqueous solutions. The influence of the ligand environment (i.e. organic solvent, polymeric membrane or micelle) on the properties of the sensing materials is analyzed and the sensors are compared.

  • Is Germany a Hub of ‘Factory Europe’ for CEE Countries?
    • Aleksandra Kordalska
    • Magdalena Olczyk
    2019 Pełny tekst Ekonomista

    The goal of the paper is to decompose gross exports and imports to/from Germany for seven selected economies in Central and Eastern Europe (CEE): the Czech Republic, Estonia, Hungary, Lithuania, Latvia, Poland and Slovakia for 2000 and 2014, in order to identify the role of Germany in absorbing, reflecting and redirecting CEE trade. The authors use a gross trade decomposition proposed by Bonin and Mancini (2017), which is the extended version of the methodology of Koopman et al. (2014). The analysis shows a deep integration of CEE into ‘Factory Germany’ as the European industrial centre and a smaller role of Germany as a market of final destination. Germany plays an increasing role in the redirection of CEE exports to extra-European destinations, especially to the USA, China, and Russia. Additionally, it is found that the Baltic countries and Poland export domestic value added mostly included in services, while the Visegrád countries do so in manufacturing.

  • IV Światowy Zjazd Inżynierów Polskich i XXVI Kongres Techników Polskich w Krakowie
    • Adam Barylski
    2019 Technika Chłodnicza i Klimatyzacyjna

    Omówiono przebieg i przesłanie IV Światowego Zjazdu Inżynierów Polskich i XXVI Kongresu Techników Polskich, który odbył sie w dniach13 - 15 czerwca 2019 roku w Krakowie. Hasłem przewodnim obrad był "Inżynier Przyszłości".

  • Jacek Krenz. Akwarele
    • Jacek Krenz
    2019

    Wystawa indywidualna 24 obrazów w technice akwarelowej i akrylowej oraz rysunki

  • Jak gładkość generuje punkty periodyczne
    • Grzegorz Graff
    2019 Pełny tekst Wiadomości Matematyczne

    Jednym z ważnych problemów teorii układów dynamicznych i topologii jest pytanie, jaka jest najmniejsza liczba punktów stałych lub periodycznych w danej klasie odwzorowań. Na przykład klasyczne twierdzenie Brouwera stwierdza, że każde ciągłe odwzorowanie kuli domkniętej w siebie ma przynajmniej jeden punkt stały. Szczególnie interesujące staje się powyższe pytanie w odniesieniu do klasy homotopii danego odwzorowania f. Artykuł poświęcony jest temu zagadnieniu oraz problemowi wzrostu liczby punktów periodycznych dla odwzorowań sfery w siebie.

  • Jak wiele wiedzy warto zdobyć na studiach? Strategie studiowania na przykładzie studentów zarządzania Politechniki Gdańskiej
    • Paweł Ziemiański
    • Krzysztof Zięba
    2019 Pełny tekst Przedsiębiorstwo we współczesnej gospodarce - teoria i praktyka

    Dane statystyczne dotyczące obiektywnej sytuacji osób kończących studia na uczelni wyższej (np. łatwość znalezienia pracy, początkowe zarobki) wskazują na racjonalność podjęcia decyzji o studiowaniu. Jednocześnie w obliczu głosów krytykujących system kształcenia wyższego, dla studentów najistotniejszym profitem osiąganym w wyniku studiów może stawać się dyplom ich ukończenia. W artykule opisane są przeprowadzone przez autorów badania jakościowe i ilościowe, których celem jest identyfikacja strategii studiowania obieranych przez studentów. Wykorzystano metodę sędziów kompetentnych, którymi byli studenci ostatniego semestru, którzy wskazywali (n = 31) i rangowali (n = 30) wiedzę niezbędną do tego, aby poradzić sobie na studiach. Uzyskane od nich informacje zostały wykorzystane do zidentyfikowania możliwych strategii studiowania, które następ-nie były oceniane przez studentów dopiero rozpoczynających studia (n = 176). Uzyskane wyniki wskazują na preferowanie przez studentów strategii kładących nacisk na jedynie niektóre elementy wiedzy dostępnej w czasie studiów. Ponadto, wybory strategii wskazywane przez studentów dopiero rozpoczynających studia są tożsame z wyborami wskazywanymi przez studentów ostatniego semestru. W opinii autorów uzyskane wyniki mogą zostać wykorzystane w praktyce edukacyjnej, na przykład do tworzenia bardziej zindywidualizowanych ścieżek studiowania.

  • Jakość w pomorskim Modele doskonałości jako podstawa promocji jakości. Przegląd rozwiązań światowych - cz.1.
    • Piotr Grudowski
    2019 Pełny tekst Biuletyn Informacyjny PR FSNT NOT w Gdańsku

    W opracowaniu przedstawiono model Nagrody im W.E. Deminga stosowany do oceny doskonałości organizacyjnej

  • Jakość w Pomorskim. Modele doskonałości jako podstawa promocji jakości. Przegląd rozwiązań światowych – cz.2
    • Piotr Grudowski
    2019 Pełny tekst Biuletyn Informacyjny PR FSNT NOT w Gdańsku

    W artykule zaprezentowano stosowane w różnych regionach świata tzw. modele doskonałości organizacyjnej stanowiące podstawę przyznawania krajowych nagród jakości. Szczególną uwagę zwrócono na stosowany w Stanach Zjednoczonych model MBNQA.

  • JamesBot - an intelligent agent playing StarCraft II
    • Zdzislaw Kowalczuk
    • Jan Cybulski
    • Michał Czubenko
    2019 Pełny tekst

    The most popular method for optimizing a certain strategy based on a reward is Reinforcement Learning (RL). Lately, a big challenge for this technique are computer games such as StarCraft II which is a real-time strategy game, created by Blizzard. The main idea of this game is to fight between agents and control objects on the battlefield in order to defeat the enemy. This work concerns creating an autonomous bot using reinforced learning, in particular, the Q-Learning algorithm for playing StarCraft. JamesBot consists of three parts. State Manager processes relevant information from the environment. Decision Manager consists of a table implementation of the Q-Learning algorithm, which assigns actions to states, and the epsilon-greedy strategy, which determines the behavior of the bot. In turn, Action Manager is responsible for executing commands. Testing bots involves fighting the default (simple) agent built into the game. Although JamesBot played better than the default (random) agent, it failed to gain the ability to defeat the opponent. The obtained results, however, are quite promising in terms of the possibilities of further development.

  • Janiela
    • Krzysztof Wróblewski
    2019

    Obraz był częścią wystawy "30 lat galerii Milano". Tematem obrazu jest rzeźba pt. "Janiela" autorstwa Stanisława Horno-Popławskiego

  • Jaw biomechanics: Estimation of activity of muscles acting at the temporomandibular joint
    • Wiktoria Wojnicz
    • Izabela Lubowiecka
    • Agnieszka Tomaszewska
    • Katarzyna Szepietowska
    • Paweł Michał Bielski
    2019 Pełny tekst AIP Conference Proceedings

    The aim of this study was to elaborate a method of estimation of activity of surface muscles acting at the temporomandibular joint of the healthy subjects by using a surface electromyography (EMG). The scope of this study involved testing chosen jaw motions (open, close, lateral deviation) and process of mastication occurring during eating food with different toughness (chewing gum, cereal and carrot) by using mixed sides, right side and left side of the jaw.

  • Job-related emotions and job burnout among civil servants: examining the shape of the relationship in cross-sectional and longitudinal models
    • Beata Basińska
    • Ewa Gruszczyńska
    2019 Pełny tekst MEDYCYNA PRACY

    Wstęp: Związek pozytywności, czyli proporcji między pozytywnymi a negatywnymi emocjami, z wypaleniem zawodowym może przybierać kształt krzywoliniowy. Ponadto z perspektywy teoretycznej jest to relacja przyczynowo - skutkowa, w której pozytywność jest proksymalnym, a wypalenie – dystalnym wymiarem dobrostanu zawodowego. Dotychczasowe badania były jednak prowadzone najczęściej w planie poprzecznym i testowały relacje prostoliniowe. Celem pracy było zbadanie kształtu relacji między pozytywnością a wypaleniem zawodowym z uwzględnieniem planów poprzecznego i podłużnego na przykładzie grupy urzędników administracji publicznej. Materiał i metody: W badaniu wzięło udział 238 urzędników (73,5% stanowiły kobiety). Pozytywność oceniano za pomocą Skali dobrostanu emocjonalnego w pracy (Job-related Affective Well-being Scale – JAWS-12). Wyczerpanie i zdystansowanie – 2 komponenty wypalenia zawodowego – mierzono dwukrotnie, w odstępie 4 miesięcy, za pomocą Oldenburskiego kwestionariusza wypalenia zawodowego (Oldenburg Burnout Inventory – OLBI). Wyniki: W planie poprzecznym modele uwzględniające relacje krzywoliniowe między pozytywnością a wypaleniem zawodowym były lepiej dopasowane do danych niż modele zawierające relacje prostoliniowe. Relacje między pozytywnością a wyczerpaniem i zdystansowaniem były krzywoliniowe z punktem przegięcia funkcji około wartości 2 dla pozytywności. W planie podłużnym dla wyczerpania w dalszym ciągu lepiej dopasowany był natomiast model krzywoliniowy, podczas gdy dla zdystansowania – model prostoliniowy. Wnioski: W grupie urzędników relacje między pozytywnością a wyczerpaniem były krzywoliniowe. Może to wskazywać na indywidualne koszty utrzymywania w pracy wyższego nasilenia emocji pozytywnych w porównaniu z negatywnymi. Z kolei rola pozytywności dla zdystansowania jest jednak bardziej złożona, z możliwą funkcją ochronną w dłuższej perspektywie czasowej.

  • Justification of models of changing project environment for harvesting grain, oilseed and legume crops
    • Anatolii Тryhuba
    • Oleh Bashynskyi
    • Ievgen Medvediev
    • Serhii Slobodian
    • Dmytro Skorobogatov
    2019 Independent Journal of Management & Production

    An analysis of the condition of implementation of projects in agricultural production is carried out. The disadvantages of existing methods and models of planning of the content and time of execution of works in the projects, which mostly do not take into account the changing components of their project environment, are substantiated. The proposed methodology for justifying the models of a changing project environment for harvesting grain, oilseed and legume crops is based on the analysis of official statistics of agrometeorological stations and involves the implementation of production experiments, which makes it possible to increase the accuracy of the results. It has been established that the dewy periods of time in the projects for the collection of early oilseeds, cereals and legumes are characterized by a probabilistic distribution of the time of occurrence of dew and its duration. The indicated regularity and the established correlation relationship between the occurrence of dew and its duration are the main components of the model. The substantiated model of the pink period of time allows to take into account the changing events of the project environment and to improve the quality of the content management process and the time of performance of the harvesting work. It is established that the deficit of humidity in the air, in which the performance of harvesting is effective, changes over the course of the day by parabolic dependence. Its maximum value depends on the agrometeorologically acceptable duration of the works in the projects of harvesting early oilseeds, grain and legume crops, which is the basis for substantiating the model of the air humidity deficit and taking into account its impact on the implementation of works in these projects. The obtained results of the research are the basis of development of simulation models of projects for the collection of early oilseeds, grain and legume crops to improve the accuracy of determining the use indicators and resource requirements for the implementation of these projects. The obtained models increase the quality of management decision making in the projects of harvesting early oilseeds, grain and legume crops.

  • Key-Marker Volatile Compounds in Aromatic Rice (Oryza sativa) Grains: An HS-SPME Extraction Method Combined with GC×GC-TOFMS
    • Widiastuti Setyaningsih
    • Tomasz Majchrzak
    • Tomasz Dymerski
    • Jacek Namieśnik
    • Miguel Palma
    2019 Pełny tekst MOLECULES

    The aroma of rice essentially contributes to the quality of rice grains. For some varieties, their aroma properties really drive consumer preferences. In this paper, using a dynamic headspace solid-phase microextraction (HS-SPME) system coupled to a two-dimensional gas chromatography (GC×GC) using a time-of-flight mass spectrometric detector (TOFMS) and multivariate analysis, the volatile compounds of aromatic and non-aromatic rice grains were contrasted to define some chemical markers. Fifty-one volatile compounds were selected for principal component analysis resulting in eight key-marker volatile compounds (i.e., pentanal, hexanal, 2-pentyl-furan, 2,4-nonadienal, pyridine, 1-octen-3-ol and (E)-2-octenal) as responsible for the differences between aromatic and non-aromatic rice varieties. The factors that are most likely to affect the HS-SPME efficiency for the aforementioned key-marker compounds were evaluated using a 25−2III fractional factorial design in conjunction with multi-response optimisation. The method precision values, expressed as % of coefficient of variation (CV), were ranging from 1.91% to 26.90% for repeatability (n = 9) and 7.32% to 37.36% for intermediate precision (n = 3 × 3). Furthermore, the method was successfully applied to evaluate the volatile compounds of rice varieties from some Asian countries.

  • Kinematyka docierarek tarczowych
    • Adam Barylski
    2019 Przegląd Mechaniczny

    Przeanalizowano kinematykę docierania powierzchni płaskich w układach jedno- i dwutarczowych. Przedstawiono opracowane modele standardowych układów kinematycznych. Wyznaczono zakresy zmienności prędkości docierania i wartości przyspieszeń w analizowanych układach wykonawczych docierarek.

  • Kinetic characterization of hydrogen sulfide inhibition of suspended anammox biomass from a membrane bioreactor
    • Kamil Wiśniewski
    • Alessandro Di Biase
    • Gulio Munz
    • Jan Oleszkiewicz
    • Jacek Mąkinia
    2019 BIOCHEMICAL ENGINEERING JOURNAL

    The inhibition effects of hydrogen sulfide (H2S) on anammox-enriched biomass from a laboratory membrane reactor were analyzed in a series of batch respirometric experiments. The determined half maximal inhibitory concentration (IC50) was 4.67 mg H2S-S L−1 at the constant pH = 7.0 and the total sulfide concentration varying between 1 and 15 mg TS-S L−1. In another test, the IC50 was found to be 4.25 mg H2S-S L−1 under a constant total sulfide concentration of 11 mg TS-S L−1 and the pH varying from 7.0 to 7.9. The decrease in the anammox activity was due to the pH-dependent un-ionized form of H2S. The results were simulated using Activated Sludge Model No. 1, extended with the two-step nitrification and anammox processes. The inhibition effect of pH and H2S concentration was determined using the Hultman pH function and inhibition switching function, respectively. The maximum specific growth rate of anammox bacteria at the optimum pH (pHopt = 7.2) was 0.075 d-1 (at T = 35 °C), whereas the inhibition coefficient of H2S, (Ki,H2S) was 4.9 mg H2S-S L-1. The experimental and simulation results confirmed that even low H2S concentrations have a strong inhibitory effect on the anammox process.

  • KNOWING WHEN TO SAY NO / SAPERE QUANDO DIRE NO
    • Karolina Zielińska-Dąbkowska
    2019 Arredo&Citta

    Ever since we began illuminating the exterior of the slender skyscrapers built during the of 20s and 30s in XX century, urban lighting has been considered a way to beautify cities, and make them more visually prominent and safe. At that time, we knew so little about the impact of lighting on humans, flora and fauna, so it never occurred to lighting designers then, that their actions would have harmful consequences. In those days, it was all about demonstrating the power of light and technology at night. Thankfully, in the last two decades in particular, professional lighting designers have recognised they have a responsibility and moral obligation to use lighting with far more care, caution and restraint. This has been largely driven by the vast research that’s accumulated in different fields involving astronomy, biology, medicine, ecology etc. – all of which confirms that artificial light at night has far-reaching negative impacts that go far beyond what we could have first anticipated. Today, we are not only accountable for designing illuminating urban elements such as buildings, squares, landmarks, and parks etc. so they look visually pleasing and are energy efficient. Most importantly, our designs must be as safe, sustainable, and as responsible as possible. It’s imperative we acknowledge what’s at stake because the general public is watching us, demanding improved, healthier lighting.

  • Knowledge Exchange Between KIBS Firms and Their Clients: Case Study Analysis
    • Małgorzata Zięba
    • Ettore Bolisani
    • Enrico Scarso
    2019 Pełny tekst

    Purpose: This paper aims to analyse knowledge exchange between KIBS firms and their clients, and their potential determinants (e.g. client’s education, type of the service offered, channel of the knowledge exchange, and willingness of the customer to accept the knowledge). The paper is based on a literature analysis and a case study research, examining 5 KIBS firms located in the Pomeranian region in Poland. Methodology: On the basis of a literature analysis on KM and KIBS companies, the following research question was formulated: What are the determinants of a knowledge exchange between a KIBS firm and its client? To answer this question, five case studies from KIBS companies of various sizes and offering various services have been examined. Findings: The results of the study show that there are different determinants of knowledge exchange between a KIBS firm and its customer. First of all, the type of service delivered is one of these factors. For example, if a KIBS firm delivers a standard solution, not tailored to the needs of the customer, there is no need for an intensive knowledge exchange. Conversely, if the KIBS service is adjusted for fitting the needs of a customer and is customized, then an intensive knowledge exchange takes place. Second, the openness of the customer is the next determinant. If the customer wants to learn and absorb knowledge, the knowledge exchange process is easier. Third, the channel of knowledge exchange is also determinant. If there are good conditions for free flows of ideas and discussions, knowledge exchange is more abundant. Another determinant appeared to be the education background of the customer. Research limitations: Research results are limited to five companies only, all located in Poland. As such, they cannot illustrate the whole picture of existing small companies, nor they cover the companies of other countries. Practical implications: The findings of both literature review and case study analysis indicate that there are several factors that KIBS firms should focus on, if they want to improve knowledge exchanges with their customers. Originality/value: The paper contributes to a better understanding of knowledge exchange processes occurring in a trade relationship between KIBS firms and their customers. It shows why and when this kind of exchange is crucial and what factors can influence it.

  • Knowledge Flows in Cluster Organizations
    • Anna Lis
    • Małgorzata Zięba
    2019

    This paper aims to identify knowledge flows in cluster organizations (COs). On the basis of a literature analysis on knowledge flows and cluster organizations, the following research question was formulated: What kind of knowledge flows can be identified in cluster organizations and what is their main characteristics? The paper is based on a literature analysis and Grounded Theory methodology, examining four purposefully selected cluster organizations in Poland. To answer research question, in total 35 in-depth individual interviews were conducted with cluster entities. The results of the study show that there are two major types of knowledge flows in cluster organizations that can be identified, namely: internal transfer understood as transmission of knowledge and information inside COs (among cluster entities) and acquiring knowledge and information from outside COs/ transmission outside COs. As far as the characteristics of the identified knowledge flows is concerned, they can be defined with regard to the type of information and knowledge in the analyzed knowledge flows as well as the commitment (key activities) in cluster cooperation. The study demonstrates that in some knowledge flows only selected, the most engaged cluster members take part. Depending on the form of commitment, they can participate in one-way or two-way flows of knowledge and information. The paper contributes to a better understanding of the potential knowledge flows in cluster organizations and their characteristics. The novelty of the paper resides in the fact that so far the topic of knowledge flows among cluster organizations has been examined in a fragmented way and there is a scarcity of research in this area. However, research results are limited to four cluster organizations, all located in Poland. As such, they cannot illustrate the whole picture of cluster entities from other countries. The subjectivity of qualitative research also does not allow generalizing results on the entire population of cluster organizations in Poland. Propositions formulated on the basis of qualitative research should be tested on a larger sample, on the basis of quantitative research.

  • Knowledge management approaches of small and medium-sized firms: a cluster analysis
    • Vlad-Andrei Alexandru
    • Ettore Bolisani
    • Andreia Gabriela Andrei
    • Juan Gabriel Cegarra-Navarro
    • Aurora Martínez Martínez
    • Marco Paiola
    • Enrico Scarso
    • Elena-Mădălina Vătămănescu
    • Małgorzata Zięba
    2019 Pełny tekst KYBERNETES

    Purpose This paper aims to categorise the approaches to knowledge management (KM) by companies. In the literature, there is no consensus on a universal or “best” approach to KM. Especially, this paper singles out and discusses the variegated features that characterise the implementation of KM by small- and medium-sized enterprises (SMEs) having different characteristics. Design/methodology/approach A cluster analysis was used to detect the possible distinct traits of companies that have different approaches to KM. The unit of analysis is represented by small- and medium-sized knowledge intensive business services (KIBS) firms. Data were collected by means of an extensive survey of 223 companies in different European countries and sectors. Findings Three clusters were identified: Companies showing a relative “unconscious” attention to KM and implementing KM practices without particular awareness; Companies adopting a more conscious approach and using a significant number of KM practices; and companies with a marginal propensity towards KM. Research limitations/implications This study considers only KIBS, and future research should include other economic sectors. In addition, a convenience sample was used. Practical implications This paper improves awareness of managers of small companies concerning different KM approaches that can be adopted. It highlights that a conscious adoption of a KM strategy involves the introduction of a set of consistent practices. Originality/value The topic of KM approaches by small companies is still underdeveloped in the literature. Also, the paper proposes a multi-contextual investigation that makes it possible to highlight the transversality of KM approaches across different countries or sectors.

  • Knowledge Sharing and Organizational Culture Dimensions: Does Job Satisfaction Matter?
    • Wioleta Kucharska
    • Denise A. D. Bedford
    2019 Pełny tekst Electronic Journal of Knowledge Management

    The aim of this study is to examine how job satisfaction influences the relationship between company performance, knowledge sharing, and organizational culture, perceived through the prism of Hofstede’s cultural dimensions, controlled by company size and staff position. A survey of 910 Polish employees (mainly knowledge workers) with different roles and experiences across different industries was conducted. The data were analyzed using structural equation modeling. The findings prove that job satisfaction is a strong mediator for company culture dimensions and knowledge sharing by the high skilled employee. The influence of masculinity, long-term perspective, and collectivism on knowledge sharing are fully mediated by job satisfaction. Uncertainty avoidance and power distance are partially mediated. The relationship between job satisfaction and company performance is complementarily mediated by knowledge sharing. For optimum company performance, it is important to create a company culture that, first, increases job satisfaction and, second, enhances knowledge sharing. Job satisfaction of knowledge workers in Poland is influenced by low power distance, teamwork, and long-term perspective, and clear rules, strength, and a dominant and assertive male style of management lead to knowledge sharing. The main value of this study is the complete picture it provides of the mediation function of job satisfaction for company culture and knowledge sharing and performance based on a multisector sample.

  • Kod Carstena? Symbolika detali na gmachach Politechniki Gdańskiej
    • Janusz Waluszko
    2019 Pismo PG

    Znaczenie wystroju architektonicznego gmachów PG

  • Kombucha from alternative raw materials – The review
    • Katarzyna Emiljanowicz
    • Edyta Malinowska-Pańczyk
    2019 Pełny tekst CRITICAL REVIEWS IN FOOD SCIENCE AND NUTRITION

    Nowadays, people's awareness about the role of diet in maintaining well-being and good health has increased. Consumers expect that the products not only provide them with essential nutrients but will also be a source of biologically active substances, which are beneficial to their health. One of the "healthy trends," which has appeared among the consumers worldwide is kombucha, a tea drink with high antioxidant potential, obtained through the activity of a consortium of acetic acid bacteria and osmophilic yeast, which is also called "tea fungus." Kombucha obtained from tea is characterized by its health-promoting properties. Promising results in in vitro and in vivo studies have prompted research groups from around the world to search for alternative raw materials for tea fungus fermentation. Attempts are made to obtain functional beverages from leaves, herb infusions, vegetable pulp, fruit juices, or milk. This review focuses on describing the progress in obtaining a fermented beverage and bacterial cellulose using tea fungus on alternative raw materials.

  • Kompensatory i ich wpływ na pracę systemu elektroenergetycznego
    • Robert Kowalak
    2019

    Praca porusza zagadnienia pracy i lokalizacji kompensatorów bocznikowych w systemie elektroenergetycznym, przy czym szczególną uwagę poświęcono najnowocześniejszym odmianom kompensatorów. Podstawowym analizowanym zagadnieniem jest wpływ kompensatorów na stan napięć w węzłach systemu elektroenergetycznego w różnych stanach jego pracy. Drugim z głównych analizowanych zagadnień jest określanie lokalizacji kompensatorów w sieci elektroenergetycznej, w celu ich jak najlepszego wykorzystania do stabilizacji napięcia.

  • Kompleksy fosfidowe żelaza: synteza, struktura i właściwości
    • Kinga Kaniewska-Laskowska
    2019 Pełny tekst

    Kompleksy żelaza, w porównaniu ze związkami innych metali przejściowych, są obiecującymi materiałami do otrzymywania szerokiej gamy układów o interesujących właściwościach na co wpływ ma przede wszystkim czynnik ekonomiczny oraz niska toksyczność tego pierwiastka. Prezentowana przeze mnie rozprawa doktorska dotyczy syntezy pierwszych fosfidowych i fosfanylofosfidowych kompleksów żelaza(II) stabilizowanych ligandem β-diketiminowym oraz homoleptycznych fosfidowych kompleksów żelaza, a także określenia ich właściwości strukturalnych, chemicznych oraz magnetycznych. Reakcje pomiędzy wyjściowymi substratami metalicznymi: β-diketiminowym kompleksem żelaza(II) [(Dippnacnac)FeCl2Li(dme)2] oraz bromkiem żelaza(II) [FeBr2(thf)2] a prekursorami liganda fosfanylofosfidowego R2PP(SiMe3) oraz fosfidowego R2P doprowadziły do otrzymania 21 związków wyizolowanych w postaci krystalicznej. Ich struktura w ciele stałym została wyznaczona za pomocą rentgenowskiej analizy strukturalnej pojedynczego kryształu. Wyniki przeprowadzonych badań wskazują, że łatwo można sterować reakcjami prowadzącymi do otrzymania planowanych kompleksów żelaza zmieniając stechiometrię reakcji, rozpuszczalnik czy też wielkość podstawników połączonych z atomem fosforu. Dla części z nich, pomimo właściwości paramagnetycznych, możliwym okazało się także określenie ich budowy strukturalnej w roztworze przy użyciu spektroskopii magnetycznego rezonansu jądrowego 1H NMR. Do wyznaczenia struktury elektronowej wybranych związków żelaza, a także do określenia właściwości magnetycznych została wykorzystana spektroskopia Mössbauera, spektroskopia elektronowego rezonansu paramagnetycznego EPR oraz badania magnetometryczne. Dalsze badania reaktywności kompleksów fosfidowych żelaza(II) z ligandem β-diketiminowym wykazały, iż są one katalizatorami w reakcjach sprzęgającego odwodornienia drugorzędowej fosfiny Ph2PH prowadzących do otrzymania symetrycznego difosfanu Ph2P-PPh2. Ponadto, w toku wykonanych eksperymentów, okazało się, że homoleptyczne kompleksy fosfidowe są nie tylko ciekawe pod względem strukturalnym, ale także mogą znaleźć zastosowanie jako prekursory fosforku żelaza FeP, który jest obiecującym materiałem w badaniach dotyczących poszukiwania nowych (elektro)katalizatorów wykorzystywanych np. w reakcjach rozkładu wody.

  • Koncepcja metodyki badań technicznych pojazdów zabytkowych w stacjach kontroli pojazdów
    • Adrian Malinowski
    2019 Pełny tekst

    W pojazdach uznanych za zabytkowe w ramach badań naukowych realizowanych przy współpracy Politechniki Gdańskiej oraz okręgowej Stacji Kontroli Pojazdów, wykonano serię pomiarów za pomocą urządzeń diagnostycznych. Badania przeprowadzono dla grupy pojazdów współczesnych oraz dla grupy pojazdów zabytkowych w warunkach stacji kontroli pojazdów oraz na drodze. Otrzymane wyniki dotyczą pomiarów sił hamowania, tłumienia zawieszenia oraz opóźnienia hamowania samochodów o dopuszczalnej masie całkowitej nie przekraczającej 3,5 tony. Przeprowadzono analizę porównawczą otrzymanych wyników dla podanych dwóch grup pojazdów. Dla wybranych pojazdów wykonano porównanie wyników badań podczas hamowania w naturalnych warunkach z wynikami symulacji komputerowej oraz metod obliczeniowych. Na podstawie zebranych wyników zaproponowano nowatorską procedurę dotyczącą badań technicznych pojazdów zabytkowych opracowano koncepcję metodyki badań technicznych pojazdów zabytkowych w stacjach kontroli pojazdów, która wraz z zaproponowaną procedurą jej wykonywania umożliwi zastąpienie aktualnie obowiązującego „Badania co do zgodności z warunkami technicznymi pojazdu zabytkowego”. Możliwe będzie wdrożenie nowej procedury badań technicznych pojazdów zabytkowych przy wykorzystaniu pomiaru opóźnienia hamowania wraz z określeniem ogólnego stanu technicznego pojazdu w odniesieniu do utworzonych nowych stabelaryzowanych wytycznych co do dopuszczenia pojazdów do ruchu wraz z określeniem daty następnego badania technicznego oraz wprowadzania ograniczeń w sposobie użytkowania pojazdów zabytkowych.

  • Koncepcja metodyki powypadkowych badań technicznych pojazdów w aspekcie rekonstrukcji wypadków drogowych
    • Marcin Witkiewicz
    2019 Pełny tekst

    W pracy została przedstawiona koncepcja metodyki powypadkowych badań technicznych pojazdów w aspekcie rekonstrukcji wypadków drogowych oraz analiza problemu dotyczącego uszkodzeń mogących wystąpić w układach hamulcowych podczas intensywnego hamowania. Omówiona w pracy analiza metodyki powypadkowych badań technicznych zawiera rzeczywiste przykłady oględzin pojazdów biorących udział w zderzeniach drogowych. Przeprowadzono szereg badań drogowych procesu hamowania samochodu osobowego na różnych nawierzchniach (gruntowej, asfaltowej suchej i mokrej oraz płycie poślizgowa o grubości warstwy wody około 2 mm), w trakcie którego wystąpiła awaria układu hamulcowego. Wykonano również szereg badań stanowiskowych procesu hamowania samochodu w trakcie, którego wystąpiła niesprawność układu hamulcowego. Wyniki przeprowadzonych badań drogowych i stanowiskowych będą mogły zostać wykorzystane przez biegłych sądowych i rzeczoznawców samochodowych w trakcie analizowania i opracowywania opinii techniczno–kryminalistycznej dla policji, prokuratur, sądów z zakresu ekspertyzy i rekonstrukcji wypadków drogowych. Na podstawie przeprowadzonych innowacyjnych badań wyznaczono współczynnik N f niesprawności (nieszczelności) układu hamulcowego. W pojazdach biorących udział w wypadkach drogowych, w których wykryto awarię (uszkodzenie, rozszczelnienie układu hamulcowego) należy podczas wyznaczania wartości opóźnienia hamowania uwzględnić wyznaczony doświadczalnie współczynnik N f niesprawności układu hamulcowego.

  • Koncepcja metropolitalnego slow-przedmieścia jako narzędzie poprawy jakości życia w międzymieście
    • Gabriela Maria Rembarz
    2019 Pełny tekst Journal of Public Governance

    Powstałe wskutek suburbanizacji struktury uznawane są za nową formę krajobrazu zurbanizowanego. Poprawa ich jakości wymaga stworzenia nowych narzędzi planowania międzymiasta (niem. die Zwischenstadt). Należą do nich innowacyjne wizje przestrzenne, kreujące alternatywę dla globalnych trendów homogenizujących kulturę życia społecznego w strefi e podmiejskiej. Inspirowana modelem agri-hood autorska koncepcja slow-przedmieścia wykorzystuje doświadczenie sieci miast Cittaslow. Elementy miejskich i wiejskich programów zintegrowane zostają w spójnej strategii na rzecz poprawy jakości życia na obrzeżach metropolii. Zachowane w miejskich peryferiach pozostałości tradycyjnych przedmieść i układów ruralistycznych stanowią potencjał stworzenia metropolitalnych enklaw wysokiej jakości ż y c i a w p o w o l - n o ś c i. Artykuł zawiera opis trzech przypadków badawczych z Gdańska, które odniesiono do międzynarodowych badań.

  • Konferencja Stowarzyszenia Muzeów Uczelnianych na Politechnice Gdańskiej
    • Magdalena Jaszcza
    2019 Pełny tekst Pismo PG

    W dniach 23–25 października w Gdańsku odbędzie się konferencja „Dziedzictwo Akademickie. Formy i kierunki partycypacji muzeów uczelni wyższych”. Jest to najważniejsze w tym roku wydarzenie gromadzące przedstawicieli niemal wszystkich muzeów uczelnianych w Polsce. Będzie ono okazją dla specjalistów do wymiany dobrych praktyk i doświadczeń w zakresie zarządzania muzeum w strukturach szkoły wyższej, a także jego roli w integracji środowiska akademickiego i społeczności lokalnej wokół dziedzictwa uczelni.

  • Konkurencyjność międzynarodowa krajów
    • Hanna G. Adamkiewicz
    2019

    Za podstawę badań autorskich nt. konkurencyjności międzynarodowej przyjęto raporty World Economic Forum (WEF). W rozdziale pierwszym przedstawiono rozważania związane z teoretycznymi aspektami konkurencyjności międzynarodowej oraz zaproponowano autorską definicję pojęcia konkurencyjności międzynarodowej kraju. W rozdziale drugim omówiono metodologię pomiaru Global Competitiveness Index (GCI). Podjęto próbę krytycznej oceny GCI, z uwzględnieniem interpretacyjnych pułapek rankingów. Analiza krytyczna metodologii pomiaru GCI dała asumpt do czerpania z dorobku naukowego, związanego z ujęciami otoczenia dalszego i bliższego przedsiębiorstwa. W rozdziałach kolejnych zaproponowano koncepcję międzynarodowej konkurencyjności czynnikowej i wynikowej kraju. Korzystając z materiału źródłowego (raporty WEF), podjęto próbę pogrupowania stu czternastu szczegółowych podfilarów GCI, wyróżniając komponenty międzynarodowej konkurencyjności wynikowej oraz podgrupy o charakterze międzynarodowej konkurencyjności czynnikowej. Nie pominięto żadnego z podfilarów. Każdy został, zgodnie z przyjętymi kryteriami klasyfikacji, przyporządkowany do konkretnej grupy wyróżnionych rodzajów konkurencyjności międzynarodowej kraju. Następnie przeprowadzono empiryczną identyfikację wymiarów międzynarodowej konkurencyjności czynnikowej kraju, uznając, że tylko one mogą być determinantami produktywności makroekonomicznej. W tym celu zastosowano metodę głównych składowych. Pomiar jakiegokolwiek rodzaju produktywności zależy od wyboru mierników ilościowych. W rozdziale szóstym omówiono praktykę pomiaru produktywności gospodarki narodowej, proponowaną przez autorów bazy Penn World Tables (PWT), uznając ją za najlepsze źródło danych statystycznych na temat mierników dochodu narodowego i czynników produkcji. Wykorzystano bazę danych PWT do weryfikacji (falsyfikacji) hipotezy o występowaniu zależności między produktywnością makroekonomiczną a konkurencyjnością międzynarodową kraju, konkretnie – konkurencyjnością czynnikową. Ostateczną konkluzją przeprowadzonych badań autorskich jest falsyfikacja hipotezy, że konkurencyjność międzynarodowa jest determinantą produktywności makroekonomicznej. Oznacza to, że metodologia pomiaru GCI nie odpowiada przyjętym a priori założeniom, a mianowicie, że tak mierzona konkurencyjność międzynarodowa, jak proponują to autorzy raportów WEF, nie jest „(…) zbiorem instytucji, polityk i czynników, determinujących poziom produktywności gospodarki (…)”.

  • Konstrukcyjno-technologiczne aspekty stosowania uchwytów modułowych i specjalnych w operacjach obróbkowych
    • Adam Barylski
    2019 Technologia i Automatyzacja Montażu

    Przedstawiono konstrukcje zaprojektowanych uchwytów modułowych i specjalnych. Wyznaczono, wariantowo, koszty uchwytów dla tych samych typów elementów. Zastosowana analiza może być między innymi wykorzystana w procesie kształcenia inżynierskiego mechaników technologów.