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Repozytorium publikacji
Politechniki Gdańskiej

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  • Polyurethane Composite Scaffolds Modified with the Mixture of Gelatin and Hydroxyapatite Characterized by Improved Calcium Deposition
    • Iga Carayon
    • Paweł Szarlej
    • Marcin Łapiński
    • Justyna Kucińska-Lipka
    2020 Pełny tekst Polymers

    The skeleton is a crucial element of the motion system in the human body, whose main function is to support and protect the soft tissues. Furthermore, the elements of the skeleton act as a storage place for minerals and participate in the production of red blood cells. The bone tissue includes the craniomaxillofacial bones, ribs, and spine. There are abundant reports in the literature indicating that the amount of treatments related to bone fractures increases year by year. Nowadays, the regeneration of the bone tissue is performed by using autografts or allografts, but this treatment method possesses a few disadvantages. Therefore, new and promising methods of bone tissue regeneration are constantly being sought. They often include the implantation of tissue scaffolds, which exhibit proper mechanical and osteoconductive properties. In this paper, the preparation of polyurethane (PUR) scaffolds modified by gelatin as the reinforcing factor and hydroxyapatite as the bioactive agent was described. The unmodified and modified scaffolds were tested for their mechanical properties; morphological assessments using optical microscopy were also conducted, as was the ability for calcification using scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX). Moreover, each type of scaffold was subjected to a degradation process in 5M NaOH and 2M HCl aqueous solutions. It was noticed that the best properties promoting the calcium phosphate deposition were obtained for scaffolds modified with 2% gelatin solution containing 5% of hydroxyapatite

  • Polyurethane glycolysate from industrial waste recycling to develop low dielectric constant, thermally stable materials suitable for the electronics
    • Arunima Reghunadhan
    • Janusz Datta
    • Maciej Jaroszewski
    • Nandakumar Kalarikkal
    • Sabu Thomas
    2020 Pełny tekst Arabian Journal of Chemistry

    We are utilizing a new method to improve the dielectric properties of a conventional polymer using a recycled polymer product. The polyurethane foams are recycled by glycolysis process and the derived material was applied to improve the dielectric properties of the brittle DGEBA epoxy resin. Two main parameters that determine the applicability of the material as a dielectric (the dielectric constant and dielectric loss), were studied at room temperature for all the blends. The properties like dielectric constant and modulus were found to be very low by the inclusion of the different compositions of recycled polyurethane. 20 phr blend was selected for optimum properties and it shows a lower dissipation factor of 1.5 × 10−2. The blends are advised as good candidates for the use in microelectronics as insulations, encapsulation and or circuit boards. We presented here an easy to process material with all the good properties require for a dielectric material. The thermal and dielectric data showed improvement than the neat polymers. The dielectric data was supported by the low water uptake of 0.5% by 20 phr blend and slightly increased contact angle from 63° to 77°.

  • Polyurethane/Silane-Functionalized ZrO2 Nanocomposite Powder Coatings: Thermal Degradation Kinetics
    • Farimah Tikhani
    • Behzad Hadavand
    • Hamed Fakharizadeh Bafghi
    • Maryam Jouyandeh
    • Henri Vahabi
    • Krzysztof Formela
    • Hossein Hosseini
    • Seyed Paran
    • Amin Esmaeili
    • Ahmad Mohaddespour
    • Mohammad Saeb
    2020 Pełny tekst Coatings

    A polyurethane (PU)-based powder coating reinforced with vinyltrimethoxysilane (VTMS)-functionalized ZrO2 nanoparticles (V-ZrO2) for thermal stability was developed. Chemical structure, microstructure and thermal degradation kinetics of the prepared coatings were investigated. The peak of aliphatic C–H vibrating bond in the Fourier transform infrared (FTIR) spectrum of V-ZrO2 was a signature of VTMS attachment. Scanning electron microscopy (SEM) images reveled that, by increase of V-ZrO2 content from 0.1 to 0.3 wt.% and then 0.5 wt.%, some agglomerations of nanoparticles are formed in the PU matrix. Thermogravimetric analysis (TGA) of the PU/V-ZrO2 powder coatings was performed at different heating rates nonisothermally to capture alteration of activation energy (Ea) of degradation of PU/V-ZrO2 powder coatings as a function of partial mass loss by using Friedman, Kissinger–Akahira-Sunose (KAS), Ozawa–Wall–Flynn (FWO) and modified Coats–Redfern isoconversional approaches. It was observed that by addition of 1 wt.% V-ZrO2 to PU resin the early state degradation temperature at 5% weight loss increased about 65 °C, suggesting a physical barrier effect limiting the volatility of free radicals and decomposition products. Incorporation of 5 wt.% ZrO2 led to about 16% and 10% increase in Ea and LnA of blank PU, respectively, which was indicative of higher thermal resistance of nanocomposite powder coatings against thermal degradation. There was also obvious agreement between model outputs and experimental data. The results reveal that nanocomposite coating shows superior thermal properties compared to neat PU powder coatings, and the presence of nano ZrO2 in sufficient amount causes retardation of the thermal decomposition process.

  • Poly(ε-Caprolactone)/Brewers’ Spent Grain Composites—The Impact of Filler Treatment on the Mechanical Performance
    • Aleksander Hejna
    2020 Pełny tekst Journal of Composites Science

    Waste lignocellulose materials, such as brewers’ spent grain, can be considered very promising sources of fillers for the manufacturing of natural fiber composites. Nevertheless, due to the chemical structure differences between polymer matrices and brewers’ spent grain, filler treatment should be included. The presented work aimed to investigate the impact of fillers’ reactive extrusion on the chemical structure and the poly(ε-caprolactone)/brewers’ spent grain composites’ mechanical performance. The chemical structure was analyzed by Fourier-transform infrared spectroscopy, while the mechanical performance of composites was assessed by static tensile tests and dynamic mechanical analysis. Depending on the filler pretreatment, composites with different mechanical properties were obtained. Nevertheless, the increase in pretreatment temperature resulted in the increased interface surface area of filler, which enhanced composites’ toughness. As a result, composites were able to withstand a higher amount of stress before failure. The mechanical tests also indicated a drop in the adhesion factor, pointing to enhanced interfacial interactions for higher pretreatment temperatures. The presented work showed that reactive extrusion could be considered an auspicious method for lignocellulose filler modification, which could be tailored to obtain composites with desired properties.

  • Poly(ε-Caprolactone)/Poly(Lactic Acid) Blends Compatibilized by Peroxide Initiators: Comparison of Two Strategies
    • Marta Przybysz-Romatowska
    • Józef Haponiuk
    • Krzysztof Formela
    2020 Pełny tekst Polymers

    Poly(ε-caprolactone) (PCL) and poly(lactic acid) (PLA) blends were compatibilized by reactive blending and by copolymers formed during reaction in the solution. The reactive blending of PCL/PLA was performed using di-(2-tert-butyl-peroxyisopropyl)benzene (BIB) or dicumyl peroxide (DCP) as radical initiator. PCL-g-PLA copolymers were prepared using 1.0 wt. % of DCP or BIB via reaction in solution, which was investigated through a Fourier transform infrared spectrometry (FTIR) and nuclear magnetic resonance (NMR) in order to better understand the occurring mechanisms. The effect of different additions such as PCL-g-PLA copolymers, DCP, or BIB on the properties of PCL/PLA blends was studied. The unmodified PCL/PLA blends showed a sea-island morphology typical of incompatible blends, where PLA droplets were dispersed in the PCL matrix. Application of organic peroxides improved miscibility between PCL and PLA phases. A similar effect was observed for PCL/PLA blend compatibilized by PCL-g-PLA copolymer, where BIB was used as initiator. However, in case of application of the peroxides, the PCL/PLA blends were cross-linked, and it has been confirmed by the gel fraction and melt flow index measurements. The thermal and mechanical properties of the blends were also investigated by means of differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), dynamic mechanical analysis (DMA), and tensile strength.

  • POM/EVA Blends with Future Utility in Fused Deposition Modeling
    • Mateusz Galeja
    • Klaudiusz Wypiór
    • Jan Wachowicz
    • Przemysław Kędzierski
    • Aleksander Hejna
    • Mariusz Marć
    • Krzysztof Klewicz
    • Jadwiga Gabor
    • Hubert Okła
    • Andrzej Szymon Swinarew
    2020 Pełny tekst Materials

    Polyoxymethylene (POM) is one of the most popular thermoplastic polymers used in the industry. Therefore, the interest in its potential applications in rapid prototyping is understandable. Nevertheless, its low dimensional stability causes the warping of 3D prints, limiting its applications. This research aimed to evaluate the effects of POM modification with ethylene-vinyl acetate (EVA) (2.5, 5.0, and 7.5 wt.%) on its processing (by melt flow index), structure (by X-ray microcomputed tomography), and properties (by static tensile tests, surface resistance, contact angle measurements, differential scanning calorimetry, and thermogravimetric analysis), as well as very rarely analyzed emissions of volatile organic compounds (VOCs) (by headspace analysis). Performed modifications decreased stiffness and strength of the material, simultaneously enhancing its ductility, which simultaneously increased the toughness even by more than 50% for 7.5 wt.% EVA loading. Such an effect was related to an improved linear flow rate resulting in a lack of defects inside the samples. The decrease of the melting temperature and the slight increase of thermal stability after the addition of EVA broadened the processing window for 3D printing. The 3D printing trials on two different printers showed that the addition of EVA copolymer increased the possibility of a successful print without defects, giving space for further development.

  • Pomiary temperatury podczas gładzenia otworów
    • Adam Barylski
    2020

    Przedstawiono wyniki badań temperatury podczas gładzenia otworów w elementach stalowych. Analizowano obróbkę otworów o średnicach 75H7, 75H10 i 150H7 mm. W badaniach zastosowano metodę termowizyjną. Otrzymane wyniki pomiarów pozwolą właściwie zaplanować miejsce i czas kontroli.

  • Pomiary terenowe i analiza techniczna stopnia agresywności korozyjnej gruntu w Bazie PERN S.A. Adamowo.
    • Krzysztof Żakowski
    • Kazimierz Darowicki
    • Tadeusz Sonneck
    2020

    W ramach realizacji pracy pobrano próbki gruntu na terenie bazy paliw i wykonano na nich analizy fizyko-chemiczne, na podstawie których określono agresywność korozyjną gruntu na terenie bazy. Uzyskane wyniki będą wykorzystane przy projektowaniu zabezpieczeń przeciwkorozyjnych obiektów na terenie bazy paliw.

  • Pomiary terenowe i analiza techniczna stopnia agresywności korozyjnej gruntu w Bazie PERN S.A. Gdańsk
    • Krzysztof Żakowski
    • Kazimierz Darowicki
    • Tadeusz Sonneck
    2020

    W ramach realizacji pracy pobrano próbki gruntu na terenie bazy paliw i wykonano na nich analizy fizyko-chemiczne, na podstawie których określono agresywność korozyjną gruntu na terenie bazy. Uzyskane wyniki będą wykorzystane przy projektowaniu zabezpieczeń przeciwkorozyjnych obiektów na terenie bazy paliw.

  • Pomiary terenowe i analiza techniczna stopnia agresywności korozyjnej gruntu w Bazie PERN S.A. Miszewko Strzałkowskie
    • Krzysztof Żakowski
    • Kazimierz Darowicki
    • Tadeusz Sonneck
    2020

    W ramach realizacji pracy pobrano próbki gruntu na terenie bazy paliw i wykonano na nich analizy fizyko-chemiczne, na podstawie których określono agresywność korozyjną gruntu na terenie bazy. Uzyskane wyniki będą wykorzystane przy projektowaniu zabezpieczeń przeciwkorozyjnych obiektów na terenie bazy paliw.

  • POPRAWY ELASTYCZNOŚCI PRACY BLOKÓW PAROWYCH I GAZOWO-PAROWYCH PRZEZ ZASTOSOWANIE MAGAZYNU PARY
    • Patryk Ziółkowski
    • Sylwia Gotzman
    • Janusz Badur
    2020 Energetyka, problemy energetyki i gospodarki paliwowo - energetycznej

    Celem niniejszej pracy jest krótki przegląd sposobów magazynowania energii i odniesienie się do sposobu, który byłby najdogodniejszy dla bloków zawodowych parowych i gazowo-parowych. W niniejszej pracy zaproponowano innowacyjny magazyn pary, który jest integralną częścią obiegu parowego, bądź gazowo-parowego i dzięki temu szybko odpowiada na zmiany zapotrzebowania na energię elektryczną, a zatem może usprawniać świadczenia usługi regulacji pierwotnej przy jednoczesnym zachowaniu wysokiej sprawności konwersji energii. W odniesieniu do bloków energetyki zawodowej poprawia bezpieczeństwo pracy jednostek wytwórczych, gdyż zapobiega przeciążaniu termicznemu kotłów i turbin w przypadku wysokiego zejście z mocą lub w przypadku gwałtownych najazdów. Elektrownia parowa, czy gazowo-parowa dostosowana do szybkich zmian mocy staje się bardziej konkurencyjna na rynku mocy poprzez poprawę charakterystyki dynamicznej.

  • Poroelastic Material for Urban Roads Wearing Courses
    • Jerzy Ejsmont
    • Beata Świeczko-Żurek
    2020 Pełny tekst Key Engineering Materials

    Conventional road materials used for producing wearing courses of roads are based on mineral aggregate and bituminous or Portland cement binders. The road materials must be optimized for different properties, including skid resistance, durability, rolling resistance and tire/road noise. Unfortunately, it seems that within classic technologies it is very difficult to achieve further reduction of tire/road noise. Innovative porous material PERS that contains considerable amount of crumb rubber seems to have great potential of traffic noise reduction. The paper presents brief history of PERS development, its present stage and unexpected properties, for example, spill fuel fires retardation

  • PORÓWNANIE SPRAWNOŚCI ŚRUB NAPĘDOWYCH JACHTU MOTOROWEGO NA STANOWISKU DYDAKTYCZNYM
    • Piotr Bzura
    2020 Pełny tekst Journal of Polish CIMEEAC

    w artykule przedstawiono autorską metodę wyznaczania sprawności działania różnych śrub napędowych jachtu motorowego na podstawie wyników badań wykonanych na stanowisku laboratoryjnym. Zastosowanie takiej metody porównawczej wymagało zbudowania prostego w użytkowaniu stanowiska dydaktycznego odwzorowującego możliwe warunki działania układu napędowego jachtu motorowego, składającego się ze źródła mocy w postaci silnika elektrycznego, części pośredniczącej i pędnika zanurzonego w wodzie. Został przedstawiony algorytm, według którego wykonano badania empiryczne dla dwuskrzydłowej i trzyskrzydłowej śruby napędowej.

  • Port jachtowy jako element przestrzeni publicznej miasta nadmorskiego
    • Katarzyna Rembarz
    2020 Pełny tekst

    Rozprawa dotyczy zbadania i przedstawienia możliwości włączenia obiektów morskiego portu jachtowego w przestrzeń publiczną miasta, wykorzystania jego potencjału do jej kształtowania i rozwoju oraz sposobów wielofunkcyjnego zagospodarowania towarzyszącej mu infrastruktury. W celu opisania relacji między przestrzenią publiczną, a portem jachtowym przeanalizowano przekształcenia terenów nadwodnych w miastach portowych, zidentyfikowano procesy prowadzące do lokalizacji portów jachtowych w tych obszarach oraz przebadano najważniejsze, położone w granicach miast, morskie porty jachtowe z terenu objętego badaniami. Na podstawie zebranego materiału wskazano czynniki wpływające na formę przestrzenną, lokalizację oraz na charakter portu jachtowego i jego relację z przestrzenią publiczną. Na tej podstawie stworzono typologię portów jachtowych w zależności od ich umiejscowienia w strukturze frontu wodnego miasta nadmorskiego i pełnionych funkcji. Następnie, na podstawie szczegółowej analizy wybranych przypadków, określono cechy i potencjał portu jachtowego jako czynnika centrotwórczego oraz wskazano sposoby ich wykorzystania w procesie kreowania przestrzeni publicznej miast portowych, a także możliwości zastosowania rozwiązań wielofunkcyjnych w ich strukturze. Szczególną uwagę poświęcono morskim portom jachtowym w Polsce, przy których projektowaniu zauważono wiele nieprawidłowości.

  • Posadzki antyelektrostatyczne kluczowym elementem ochrony przed elektrycznością statyczną - wybrane wymagania techniczne
    • Sylwia Świątek-Żołyńska
    • Tomasz Majewski
    • Maciej Niedostatkiewicz
    2020 Pełny tekst Builder

    W artykule przedstwiono w spsoób syntetyczny zbiór podstawowych wymagań technicznych jakim powinny odpowiadać posadzki antyelektrostatyczne

  • Position Estimation in Corridors Along the Coupled Mode of Radiating Cables
    • Olga Błaszkiewicz
    • Jarosław Sadowski
    • Jacek Stefański
    2020 Pełny tekst SENSORS

    Radiating cables are mostly used to provide radio communication in tunnels or corridors, but they can also be used to estimate the position of a mobile terminal along the cable. In this paper, a measuring receiver’s position was estimated by measuring the difference in the direct signal’s reception time, which was generated by a transmitter connected to one end of the radiating cable, and the delayed signal retransmitted from another end. During tests, a relatively narrowband (23 MHz) signal was used in the unlicensed band (2.4 GHz and 50 m long), which was coupled with a mode radiating cable. The cable was installed along a corridor in the office building. Measurement results used different equipment configurations (i.e., return signal only amplified or amplified and frequency-shifted), which presented possible sources of errors.

  • Positron Scattering and Annihilation in Organic Molecules
    • A. Karbowski
    • Grzegorz P. Karwasz
    • Małgorzata Franz
    • Jan Franz
    2020 Pełny tekst ACTA PHYSICA POLONICA B

    In this paper, we address the problem of connecting positron lifetimes in liquids with collision cross sections in gases. We present the analyses of annihilation lifetime spectra of positrons in the liquid benzene, c-hexane, n-hexane, methanol and ethanol and calculations of scattering cross sections of positrons with benzene and c-hexane in the gas phase.

  • Postawy menadżerów ZZL wobec pracy w zespołach zróżnicowanych kulturowo
    • Katarzyna Stankiewicz
    2020 Pełny tekst

    Celem artykułu jest przedstawienie wyników badań pilotażowych dotyczących postaw menadżerów ZZL wobec pracy w zespole zróżnicowanym versus jednolitym kulturowo w zależności od wymagań zadania stawianego przed zespołem. Postawy menadżerów, a tym bardziej menadżerów ZZL maja kluczowy wpływ na kształtowanie kultury organizacji a przez to na zachowania jej pracowników. Natomiast pozytywne postawy wobec zarządzania różnorodnością, a w tym przypadku zarządzania zespołami zróżnicowanymi kulturowo, zwiększają możliwości wykorzystania ich potencjału w organizacji. Wyniki badań wykazały, że badani menadżerowie ZZL preferowali prace w zespołach zróżnicowanych kulturowo jeśli zadanie wymagałoby przełamywania schematów, kreatywności a także podejmowania ryzyka i elastyczności w działaniu. Dodatkowo przedstawiono wyniki korelacji pomiędzy postawami badanych a ich doświadczeniem na stanowisku lidera zespołów jednorodnych i zróżnicowanych kulturowo.

  • POSTAWY MENEDŻERÓW ZZL WOBEC PRACY W ZESPOŁACH ZRÓŻNICOWANYCH KULTUROWO
    • Katarzyna Stankiewicz
    2020 Pełny tekst

    Celem artykułu jest przedstawienie wyników badań pilotażowych dotyczących postaw menadżerów ZZL wobec pracy w zespole zróżnicowanym versus jednolitym kulturowo w zależności od wymagań zadania stawianego przed zespołem. Postawy menadżerów, a tym bardziej menadżerów ZZL maja kluczowy wpływ na kształtowanie kultury organizacji a przez to na zachowania jej pracowników. Natomiast pozytywne postawy wobec zarządzania różnorodnością, a w tym przypadku zarządzania zespołami zróżnicowanymi kulturowo, zwiększają możliwości wykorzystania ich potencjału w organizacji. Wyniki badań wykazały, że badani menadżerowie ZZL preferowali prace w zespołach zróżnicowanych kulturowo jeśli zadanie wymagałoby przełamywania schematów, kreatywności a także podejmowania ryzyka i elastyczności w działaniu. Dodatkowo przedstawiono wyniki korelacji pomiędzy postawami badanych a ich doświadczeniem na stanowisku lidera zespołów jednorodnych i zróżnicowanych kulturowo.

  • Postawy przedstawicieli pokoleń X i Y wobec wykorzystania w organizacjach oddziaływań opartych na grywalizacji
    • Paweł Ziemiański
    • Patrycja Wrotkowska
    2020 Pełny tekst Zeszyty Naukowe Politechniki Poznańskiej. Organizacja i Zarządzanie

    W artykule podjęto słabo dotychczas zbadaną problematykę postaw wobec oddziaływań opartych na grywalizacji. Grupę badawczą stanowili pracujący zawodowo przedstawiciele pokoleń X oraz Y. Uczestnicy badania udzielili odpowiedzi na pytania kwestionariuszowe dotyczące ich stosunku do grywalizacji oraz zostali poproszeni o ocenę zastosowanych w przeszłości działań opartych na założeniach grywalizacji, opisanych w formie studium przypadku. Uzyskane rezultaty wykazały, że przedstawiciele pokolenia Y, szczególnie młodsi pracownicy, wykazują silniejsze przekonanie o skuteczności grywalizacji. Analizo-wanych grup pokoleniowych nie różnicuje natomiast ich subiektywne nastawienie do gry-walizacji. W artykule opisano znaczenie wyników badań w poszerzaniu obecnego stanu wiedzy o generacjach aktywnych zawodowo.

  • Post-critical buckling of truncated conical carbon nanotubes considering surface effects embedding in a nonlinear Winkler substrate using the Rayleigh-Ritz method
    • Mohammad Malikan
    • Victor Eremeev
    2020 Pełny tekst Materials Research Express

    This research predicts theoretically post-critical axial buckling behavior of truncated conical carbon nanotubes (CCNTs) with several boundary conditions by assuming a nonlinear Winkler matrix. The post-buckling of CCNTs has been studied based on the Euler-Bernoulli beam model, Hamilton’s principle, Lagrangian strains, and nonlocal strain gradient theory. Both stiffness-hardening and stiffness-softening properties of the nanostructure are considered by exerting the second stress-gradient and second strain-gradient in the stress and strain fields. Besides small-scale influences, the surface effect is also taken into consideration. The effect of the Winkler foundation is nonlinearly taken into account based on the Taylor expansion. A new admissible function is used in the Rayleigh-Ritz solution technique applicable for buckling and post-buckling of nanotubes and nanobeams. Numerical results and related discussions are compared and reported with those obtained by the literature. The significant results proved that the surface effect and the nonlinear term of the substrate affect the CCNT considerably.

  • Post-Pyrolytic Carbon as a Phase Change Materials (PCMs) Carrier for Application in Building Materials
    • Michał Ryms
    • Katarzyna Januszewicz
    • Paweł Kazimierski
    • Justyna Łuczak
    • Ewa Klugmann-Radziemska
    • Witold Lewandowski
    2020 Pełny tekst Materials

    This article covers new application for char as a carrier of phase-change materials (PCM) that could be used as an additive to building materials. Being composed of bio-char and PCM, the granulate successfully competes with more expensive commercial materials of this type, such as Micronal® PCM. As a PCM carrier, char that was obtained from the pyrolysis of chestnut fruit (Aesculus hippocastanum) with different absorbances of the model phase-change material, Rubitherm RT22, was tested. DSC analysis elucidated several thermal properties (such as enthalpy, phase transition temperature, and temperature peak) of those mixtures and the results were compared with a commercial equivalent, Micronal DS 5040 X. Comparative research, approximating realistic conditions, were also performed by cooling and heating samples in a form of coatings that were made from chars with different content of RT22. These results indicated that the use of char as a PCM carrier was not only possible, but also beneficial from a thermodynamic point of view and it could serve as an alternative to commercial products. In this case, adsorption RT22 into char allowed for temperature stabilization comparable to Micronal DS 5040 X with ease of use as well as the economic advantages of being very low cost to produce due to microencapsulation. Other advantage of the proposed solution is related with the application of char obtained from waste biomass pyrolysis as a PCM carrier, and using this product in building construction to improve thermal comfort and increase energy efficiency.

  • Potential and Use of the Googlenet Ann for the Purposes of Inland Water Ships Classification
    • Katarzyna Bobkowska
    • Izabela Bodus-olkowska Izabela
    2020 Pełny tekst Polish Maritime Research

    This article presents an analysis of the possibilities of using the pre-degraded GoogLeNet artificial neural network to classify inland vessels. Inland water authorities monitor the intensity of the vessels via CCTV. Such classification seems to be an improvement in their statutory tasks. The automatic classification of the inland vessels from video recording is a one of the main objectives of the Automatic Ship Recognition and Identification (SHREC) project. The image repository for the training purposes consists about 6,000 images of different categories of the vessels. Some images were gathered from internet websites, and some were collected by the project’s video cameras. The GoogLeNet network was trained and tested using 11 variants. These variants assumed modifications of image sets representing (e.g., change in the number of classes, change of class types, initial reconstruction of images, removal of images of insufficient quality). The final result of the classification quality was 83.6%. The newly obtained neural network can be an extension and a component of a comprehensive geoinformatics system for vessel recognition.

  • Potentiometric Solid-Contact Ion-Selective Electrode for Determination of Thiocyanate in Human Saliva
    • Marcin Urbanowicz
    • Kamila Sadowska
    • Dorota G. Pijanowska
    • Radosław Pomećko
    • Maria Bocheńska
    2020 Pełny tekst SENSORS

    A new solid-contact potentiometric ion-selective electrode for the determination of SCN− (SCN-ISE) has been described. Synthesized phosphonium derivative of calix[4]arene was used as a charged ionophore. The research included selection of the ion-selective membrane composition, determination of the ISEs metrological parameters and SCN-ISE application for thiocyanate determination in human saliva. Preparation of the ISEs included selection of a plasticizer for the ion-selective membrane composition and type of the electrode material. The study was carried out using ISE with liquid internal electrolyte (LE-ISE) and solid-contact electrodes made of glassy carbon (GC-ISE) and gold rods (Au-ISE). The best parameters were found for GC sensors for which the ion-selective membrane contained chloroparaffin as a plasticizer (S = 59.9 mV/dec, LOD = 1.6 × 10−6 M). The study of potentiometric selectivity coefficients has shown that the thiocyanate-selective sensor could be applied in biomedical research for determination of SCN− concentration in human saliva. The accuracy of the SCN− determination was verified by testing 59 samples of volunteers’ saliva by potentiometric sensors and UV-Vis spectrophotometry as a reference technique. Moreover, SCN− concentrations in the smokers’ and non-smokers’ saliva were compared. In order to investigate the influence of various factors (sex, health status, taken medications) on the thiocyanate level in the saliva, more extensive studies on a group of 100 volunteers were carried out. Additionally, for a group of 18 volunteers, individual profiles of SCN− concentration in saliva measured on a daily basis for over a month were collected.

  • POTRZEBY I MOŻLIWOŚCI UDOSKONALENIA SYSTEMÓW DIAGNOZUJĄCYCH OKRĘTOWYCH SILNIKÓW SPALINOWYCH O ZAPŁONIE SAMOCZYNNYM
    • Jerzy Girtler
    2020 Pełny tekst Journal of Polish CIMEEAC

    W artykule przedstawiono ogólnie własności współczesnych systemów diagnozujących (SDG) okrętowych siników głównych o zapłonie samoczynnym, potrzeby zastosowania SDG do sterowania procesem eksploatacji tych silników i propozycje udoskonalenia SDG dla potrzeb realizacji racjonalnej eksploatacji tego rodzaju silników. Zwrócono uwagę na potrzebę uwzględnienia we wnioskowaniu diagnostycznych wiarygodności diagnozy. Przedstawiono też korzyści wynikające z zastosowana w procesie decyzyjnym statystycznej teorii decyzji. Zasygnalizowano duży postęp w rozwoju systemów diagnozujących silników głównych na przykładzie systemów CoCoS firmy MAN SE (Maschinenfabrik Augsburg-Nürnberg) oraz CBM firmy Wärtsilä Corporation.

  • Power System Dynamics. Stability and Control. 3rd edition
    • Jan Machowski
    • Zbigniew Lubośny
    • Janusz Białek
    • James Bumby
    2020

    Comprehensive, state-of-the-art review of information on the electric power system dynamics and stability. It places the emphasis first on understanding the underlying physical principles before proceeding to more complex models and algorithms. The book explores the influence of classical sources of energy, wind farms and virtual power plants, power plants inertia and control strategy on power system stability. The book cover a range of new and expanded topics including: Wide-area monitoring and control systems; Improvement of power system stability by optimization of control systems parameters; Impact of renewable energy sources on power system dynamics; The role of power system stability in planning of power system operation and transmission network expansion; Real regulators of synchronous generators and field tests; Selectivity of power system protections at power swings in power system; Criteria for switching operations in transmission networks; Influence of automatic control of a tap changing step-up transformer on the power capability area of the generating unit; Mathematical models of power system components such as HVDC links, wind and photovoltaic power plants; Data of sample (benchmark) test systems.

  • Powrót Duchów
    • Jarosław Wawer
    2020 Elektronika dla wszystkich

    Felieton popularno-naukowy dotyczący technologii rzeczywistości rozszerzonej i sztucznej inteligencji.

  • Pół wieku ochrony architektury modernistycznej Gdyni = Gdynia – half a century of modernist architecture preservaton
    • Robert Hirsch
    2020

    Artykuł przedstawia kolejne etapy wprowadzania ochrony architektury modernistycznej Gdyni oraz realizacje związane z jej konserwacją

  • Prace doktorskie, habilitacje oraz profesury o tematyce chemii analitycznej i pokrewnej w 2019 r.
    • Marek Biziuk
    • Żaneta Polkowska
    2020 Analityka: Nauka i Praktyka

    Zestawiono prace doktorskie, habilitacje oraz profesury o tematyce chemii analitycznej i pokrewnej w 2019 r

  • Practical Approach to Large-Scale Electronic Structure Calculations in Electrolyte Solutions via Continuum-Embedded Linear-Scaling Density Functional Theory
    • Jacek Dziedzic
    • Arihant Bhandari
    • Lucian Anton
    • Chao Peng
    • James Womack
    • Marjan Famili
    • Denis Kramer
    • Chris-Kriton Skylaris
    2020 Pełny tekst Journal of Physical Chemistry C

    We present the implementation of a hybrid continuum-atomistic model for including the effects of a surrounding electrolyte in large-scale density functional theory (DFT) calculations within the Order-N Electronic Total Energy Package (ONETEP) linear-scaling DFT code, which allows the simulation of large complex systems such as electrochemical interfaces. The model represents the electrolyte ions as a scalar field and the solvent as a polarizable dielectric continuum, both surrounding the quantum solute. The overall energy expression is a grand canonical functional incorporating the electron kinetic and exchange−correlation energies, the total electrostatic energy, entropy, and chemical potentials of the surrounding electrolyte, osmotic pressure, and the effects of cavitation, dispersion, and repulsion. The DFT calculation is performed fully self-consistently in the electrolyte model, allowing the quantum-mechanical system and the surrounding continuum environment to interact and mutually polarize. A bespoke highly parallel multigrid Poisson−Boltzmann solver library, DL_MG, deals with the electrostatic problem, solving a generalized Poisson−Boltzmann equation. Our model supports open boundary conditions, which allows the treatment of molecules, entire biomolecules, or larger nanoparticle assemblies in the electrolyte. We have also implemented the model for periodic boundary conditions, allowing the treatment of extended systems such as electrode surfaces in contact with the electrolyte. A key feature of the model is the use of solute size and solvation-shell-aware accessibility functions that prevent the unphysical accumulation of electrolyte charge near the quantum solute boundary. The model has a small number of parametershere we demonstrate their calibration against experimental mean activity coefficients. We also present an exemplar simulation of an 1634-atom model of the interface between a graphite anode and LiPF6 electrolyte in an ethylene carbonate solvent. We compare the cases where Li atoms are intercalated at opposite edges of the graphite slab and in solution, demonstrating a potential application of the model in simulations of fundamental processes in Li-ion batteries.

  • Practical I-Voting on Stellar Blockchain
    • Stanisław Barański
    • Julian Szymański
    • Andrzej Sobecki
    • David Gil
    • Higinio Mora
    2020 Pełny tekst Applied Sciences-Basel

    In this paper, we propose a privacy-preserving i-voting system based on the public Stellar Blockchain network. We argue that the proposed system satisfies all requirements stated for a robust i-voting system including transparency, verifiability, and voter anonymity. The practical architecture of the system abstracts a voter from blockchain technology used underneath. To keep user privacy, we propose a privacy-first protocol that protects voter anonymity. Additionally, high throughput and low transaction fees allow handling large scale voting at low costs. As a result we built an open-source, cheap, and secure system for i-voting that uses public blockchain, where everyone can participate and verify the election process without the need to trust a central authority. The main contribution to the field is a method based on a blind signature used to construct reliable voting protocol. The proposed method fulfills all requirements defined for i-voting systems, which is challenging to achieve altogether.

  • Precipitation and Transformation of Vaterite Calcium Carbonate in the Presence of Some Organic Solvents
    • Donata Konopacka-Łyskawa
    • Natalia Czaplicka
    • Marcin Łapiński
    • Barbara Kościelska
    • Rafał Bray
    2020 Pełny tekst Materials

    In this paper, the production of CaCO3 particles via the carbonation route in the reaction of CaCl2 and CO2, using NH3 as a promoter of CO2 absorption, was studied. The solvents used as the reaction media for CaCO3 precipitation were aqueous solutions of methanol, isopropanol and dimethyl sulfoxide (DMSO), in a concentration range of 0–20% (v/v). It was found that the presence of an organic additive influenced the precipitation rate, the content of vaterite in the obtained product, the morphology and the size of the precipitated CaCO3 particles, as well as the rate of its transformation into calcite. The presence of all added organic solvents reduced the vaterite concentration in the produced CaCO3 both at the end of the reaction and after incubation in the reaction medium for 1 h. However, the transformation of vaterite particles into calcite in the tested solutions was slower when the 4 h and 24 h procedures were compared. The interactions of solvents with calcite and vaterite were compared using HPLC tests. DMSO molecules interacted with vaterite particles the most strongly, while the interaction of isopropanol with this polymorph was the weakest. The opposite effect was observed for interactions with calcite particles, and the affinity decreased in the series: isopropanol, methanol, DMSO.

  • Predicting cutting power for band sawing process of pine and beech wood dried with the use of four different methods
    • Daniel Chuchała
    • Tomasz Ochrymiuk
    • Kazimierz Orłowski
    • Marcin Lackowski
    • Piotr Taube
    2020 Pełny tekst BIORESOURCES

    Wood drying is an important stage in the woodworking process. After drying, wood is subject to a re-sawing process, for which a high quality surface, low material loss, and high efficiency are often required. In this paper, forecasted values were presented of cutting power for the re-sawing process of pine and beech wood that were dried with four different methods. Forecasting of cutting power for an industrial band saw machine that works daily in a Polish sawmill was determined. Values of cutting power were forecasted for a full range of feed speeds of the analyzed band saw machine. The achieved results allowed the observation of noticeable changes in the forecasted cutting power for a given sawing process as a function of the wood drying method applied. Significant changes were observed for pine wood, especially between air-dried pine wood and wood dried with warm air-steam mixture, and between pine wood dried in a conventional kiln and with warm air-steam mixture.

  • Predicting the seismic collapse capacity of adjacent structures prone to pounding
    • Farzin Kazemi
    • Benyamin Mohebi
    • M. Yakhchalian
    2020 CANADIAN JOURNAL OF CIVIL ENGINEERING

    In crowded cities, many structures are often constructed in a very close vicinity; ‎therefore, during severe earthquakes, pounding phenomenon occurs due to out-of-phase ‎vibrations of adjacent structures. In this study, pounding of adjacent structures is investigated ‎up to the occurrence of total collapse. The novelty of this study is performing incremental ‎dynamic analyses to compute the seismic collapse capacities of both pounding structures in ‎one model and removal of the collapsed structure during analysis‎, and proposing ‎modification ‎factors for modifying median collapse capacity of single structures to consider ‎the effect of pounding, which cannot be considered before design process. The results ‎indicate that pounding may significantly affect median collapse capacities of structures ‎compared with those obtained by neglecting the pounding phenomenon. Therefore, different ‎modification factors ‎are required according to structural characteristics. It is noteworthy that ‎the results of this study were obtained using simplifying assumptions and should not be ‎generalized.‎

  • Prediction of cast-in-place concrete strength of the extradosed bridge deck based on temperature monitoring and numerical simulations
    • Aleksandra Kuryłowicz-Cudowska
    • Krzysztof Wilde
    • Jacek Chróścielewski
    2020 Pełny tekst CONSTRUCTION AND BUILDING MATERIALS

    The work is devoted to the implementation of a monitoring system for high performance concrete embedded in the span of an extradosed bridge deck using a modified maturity method augmented by numerical simulations conducted by the authors’ FEM code. The paper presents all research stages of bridge construction and considers the conclusions drawn from the results of laboratory tests, field measurements, and numerical calculations. The monitored structure is the largest extradosed bridge in Europe in terms of the span’s length. Due to the considerable size and duration of the investment, it was beneficial to use an alternative method for estimating the compressive strength of concrete based on the maturity function. The bridge sections were investigated in three stages: in summer, autumn, and early spring (in June, September, and March). The monitoring of in-place concrete provided information on the actual temperature of the concrete and its gradients. Based on recorded temperatures and proposed numerical procedures, the actual strength of the cast-in-place concrete and the optimal dates of prestressing were determined. This contributed to shortening the work cycle and speeding up the work schedule.

  • Preliminary Identification of Quantitative Factors Determining the Duration of Court Proceedings in Commercial Cases
    • Przemysław Banasik
    • Sylwia Morawska
    • Monika Odlanicka-Poczobutt
    • Maciej Wolny
    2020 Pełny tekst European Research Studies Journal

    Purpose: The aim of the article was to identify factors that are linear combinations of the variables under scrutiny that affect the duration of court proceedings. Design/Methodology/Approach: This research was conducted on commercial cases, based on the Principal Components Analysis (PCA). The original variables were grouped into factors that are correlated with each other. The Kaiser Criterion (own value >1) was chosen as the main criterion determining the number of factors. The conducted research was subordinated to six phases, largely linked to the data mining scheme (CRISP-DM). Seven variables of a strict numerical nature marked as (vn) were distinguished from the features describing court proceedings. Findings: Based on the analysis, two main quantitative factors characterising the examined cases were identified. The first factor groups the variables:(v4) Number of hearings in the first instance/second instance, (v5) The number of days from the first hearing to the case being settled, (v6) The judgement in the first instance (number of pages), (v7) Volume of files (number of volumes),and the second one:(v1) The court fee paid, (v2) The value of the subject matter of the dispute, (v3) The number of days to the first hearing. Further research will be conducted into the development of relations between the variables in different areas of their variability, particularly with respect to the value of the matter in dispute. Practical Implications: The identified factors can be used at the micro level, in case management by a judge, at the meso level in case management in court, as well as at the macro level the entire justice system. Originality/Value: The study identified factors that affect the efficiency of court proceedings.

  • Preliminary results from HEDGEHOG REXUS project – A sounding rocket experiment on accelerations, vibrations and heat flow
    • Adam Dąbrowski
    • Karol Pelzner
    • Szymon Krawczuk
    • Jacek Goczkowski
    • Agnieszka Elwertowska
    2020 Pełny tekst ACTA ASTRONAUTICA

    During flight, a sounding rocket is subject to a unique environment - severe vibrations and substantial heat flux. In order to design payloads, precise measurement of these conditions is required. This paper presents preliminary results from HEDGEHOG REXUS Project, whose scientific goal was to characterise the thermal and dynamic environment of REXUS sounding rockets. For this purpose, two new sensors have been designed - mechanical acceleration amplifier/filter and heat flux measuring device. Both provided interesting data - vibration and heat flux profiles allowed identification of key flight phases and quantitative description of certain phenomena during flight was performed. The experiment validated the sensors and provided heating and vibration profiles. Applicability of results and conclusions for future REXUS launches is discussed in the following paper.

  • Preparation and characterisation of iron substituted Mn1.7Cu1.3-xFexO4 spinel oxides (x = 0, 0.1, 0.3, 0.5)
    • Justyna Ignaczak
    • Yevgeniy Naumovich
    • Karolina Górnicka
    • Jan Jamroz
    • Wojciech Wróbel
    • Jakub Karczewski
    • Ming Chen
    • Piotr Jasiński
    • Sebastian Molin
    2020 Pełny tekst JOURNAL OF THE EUROPEAN CERAMIC SOCIETY

    Spinel oxides with the general formula Mn1.7Cu1.3-xFexO4 (x= 0, 0.1, 0.3, 0.5) were prepared and evaluated in this work for their properties at high temperatures. The effect of partially substituting Cu by Fe has not been studied so far for this group of materials and is thus evaluated in this work. Mn1.7Cu1.3-xFexO4 powders were synthesised by a soft chemistry process and studied in terms of crystallographic phase analysis, electrical conductivity, thermal expansion, and sinterability behaviour. The results show that the Fe content has a significant influence on the phase composition and the resulting properties. Characterisation of the dilatometry and conductivity coupled with XRD phase analysis across a wide temperature range allowed the relations between the materials properties and compositions to be observed. The results indicate that Mn1.7Cu0.8Fe0.5O4 is a promising material for use as a protective coating for interconnects in intermediate temperature Solid Oxide Fuel Cells.

  • Preparation and Characterization of Defective TiO2. The Effect of the Reaction Environment on Titanium Vacancies Formation
    • Zuzanna Bielan
    • Szymon Dudziak
    • Agnieszka Sulowska
    • Daniel Pelczarski
    • Jacek Ryl
    • Anna Zielińska-Jurek
    2020 Pełny tekst Materials

    Among various methods of improving visible light activity of titanium(IV) oxide, the formation of defects and vacancies (both oxygen and titanium) in the crystal structure of TiO2 is an easy and relatively cheap alternative to improve the photocatalytic activity. In the presented work, visible light active defective TiO2 was obtained by the hydrothermal reaction in the presence of three different oxidizing agents: HIO3, H2O2, and HNO3. Further study on the effect of used oxidant and calcination temperature on the physicochemical and photocatalytic properties of defective TiO2 was performed. Obtained nanostructures were characterized by X-ray diffractometry (XRD), specific surface area (BET) measurements, UV-Vis diffuse reflectance spectroscopy (DR-UV/Vis), photoluminescence spectroscopy (PL), X-ray photoelectron spectroscopy (XPS), and electron paramagnetic resonance (EPR) spectroscopy. Degradation of phenol as a model pollutant was measured in the range of UV-Vis and Vis irradiation, demonstrating a significant increase of photocatalytic activity of defective TiO2 samples above 420 nm, comparing to non-defected TiO2. Correlation of EPR, UV-Vis, PL, and photodegradation results revealed that the optimum concentration of HIO3 to achieve high photocatalytic activity was in the range of 20–50 mol%. Above that dosage, titanium vacancies amount is too high, and the obtained materials’ photoactivity was significantly decreased. Studies on the photocatalytic mechanism using defective TiO2 have also shown that •O2- radical is mainly responsible for pollutant degradation.

  • Preparation, characterization and antimicrobial activity of polyvinyl alcohol/gum arabic/chitosan composite films incorporated with black pepper essential oil and ginger essential oil
    • Augustine Amalraj
    • Józef Haponiuk
    • Sabu Thomas
    • Sreeraj Gopi
    2020 INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES

    In this study, biocomposite films based on polyvinyl alcohol (PVA), gum arabic (GA) and chitosan (CS) incorporated with BPEO and GEO were fabricated by solvent casting method. FTIR, XRD, SEM and DSC were performed with mechanical and antimicrobial properties of PVA/GA/CS films with and without BPEO and GEO. The BPEO and GEO incorporated PVA/GA/CS films were significantly inhibited the growth of Bacillus cereus, Staphylococcus aureus, Escherichia coli and Salmonella typhimurium. The obtained results have demonstrated that both BPEO and GEO incorporated PVA/GA/CS films are promising alternatives to wound dressing and food packaging materials.

  • Preparation of Hydrogen Electrodes of Solid Oxide Cells by Infiltration: Effects of the Preparation Procedure on the Resulting Microstructure
    • Bartosz Hołówko
    • Jakub Karczewski
    • Sebastian Molin
    • Piotr Jasiński
    2020 Pełny tekst Materials

    In this work, the infiltration technique was used to produce hydrogen electrodes for solid oxide cells. Different infiltration methodologies were tested in order to try to shorten the infiltration cycle time. The porous scaffolds used for infiltration were based on highly porous yttria-stabilized zirconia (YSZ) obtained by etching the reduced nickel from the Ni-YSZ cermet in HNO3 acid. The support had a complex structure which included a ~130 µm porous functional layer with small pores and a ~320 µm thick supporting layer with large pores. Infiltrations have been carried out using aqueous nickel nitrate solutions. Various infiltration procedures were used, differing in temperature/time profiles. The results show that slow evaporation is crucial for obtaining a homogeneous material distribution leading to high-quality samples. A longer evaporation time promotes the proper distribution of nickel throughout the porous scaffold. The shortening of the heat treatment procedure leads to blockage of the pores and not-uniform nickel distribution.

  • Pressure drop and heat transfer during boiling and condensation at subcritical region
    • Stanisław Głuch
    • Dariusz Mikielewicz
    • Michał Pysz
    2020

    Most of the data presented in the literature relate to saturation temperatures in the range - 20°C to 40°C due to the application in refrigeration technology. There is necessity to extend databases to higher values of saturation temperature due to new applications such as Organic Rankine Cycle and high temperature heat pumps. Only few papers contain data for high reduced pressure for low boiling point liquids. This paper focus on research conducted on boiling and heat transfer for various fluids for increased saturation temperature. With the increase in saturation temperature to and above critical values, reduced pressure increases, the density and viscosity of the vapor phase rises, while the opposite trend is noticed for the liquid phase. These influences directly contribute to velocity increase of liquid phase and reduction of the vapor phase, what results in similar values of the phase velocities. The increase in the reduced temperature also leads to reduction in surface tension, what renders decrease of Bond number and domination of gravitational forces. This paper presents overview of current research and conception of new testing facility.

  • Pressure in charge. Neglected parameter in hydrothermal synthesis turns out to be crucial for electrochemical properties of ammonium vanadates
    • Marta Prześniak-Welenc
    • Małgorzata Nadolska
    • Andrzej Nowak
    • Kamila Sadowska
    2020 Pełny tekst ELECTROCHIMICA ACTA

    Ammonium vanadates are of great interest as they exhibit unusual electrical and sensory properties.(NH4)2V6O16and (NH4)2V10O25$8H2O with various morphology were obtained in the hydrothermalsynthesis under controlled temperature and pressure. It was shown, that the pure (NH4)2V10O25$8H2Owas obtained under 50 bar of initial pressure, whereas lower pressure lead to the mixture of twocompounds. The influence of the pressure was studied for thefirst time, and the results demonstrated itsutmost importance. Moreover, the electrochemical performance of synthesized (NH4)2V10O25$8H2Owasstudied, revealing its excellent behavior as cathode material for Li-ion batteries. To the best of our knowledge, there is no information available on using this structure in such application.

  • Pre-Treatment of Furniture Waste for Smokeless Charcoal Production
    • Paweł Kazimierski
    • Paulina Hercel
    • Katarzyna Januszewicz
    • Dariusz Kardaś
    2020 Pełny tekst Materials

    The aim of this study was to assess the possibility of using furniture waste for smokeless fuel production using the pyrolysis process. Four types of wood-based wastes were used in the pyrolysis process: pine sawdust (PS), chipboard (CB), medium-density fiberboard (MDF), and oriented strand board (OSB). Additionally, the slow and fast types of pyrolysis were compared, where the heating rates were 15 C/min and 100 C/min, respectively. Chemical analyses of the raw materials and the pyrolysis product yields are presented. A significant calorific value rise was observed for the solid pyrolysis products (from approximately 17.5 MJ/kg for raw materials up to approximately 29 MJ/kg for slow pyrolysis products and 31 MJ/kg for fast pyrolysis products). A higher carbon content of char was observed in raw materials (from approximately 48% for raw materials up to approximately 75% for slow pyrolysis products and approximately 82% for fast pyrolysis products) than after the pyrolysis process. This work presents the possibility of utilizing waste furniture material that is mostly composed of wood, but is not commonly used as a substrate for conversion into low-emission fuel. The results prove that the proposed solution produced char characterized by the appropriate properties to be classified as smokeless coal.

  • Prezentacja działa "Największe słońce widziane z ziemi, dotyka naszej relacji" na 9. Triennale Młodych w Orońsku "Póki my żyjemy"
    • Patryk Różycki
    2020

    Póki my żyjemy Jesteśmy świadomi zmiany na naszej planecie i czujemy się za nią odpowiedzialni. Dopóki tu jesteśmy mamy głos i możemy zmieniać rzeczywistość. Mamy prawo poruszać wszystkie ważne tematy dotyczące tego kim jesteśmy i jak będzie wyglądać nasza przyszłość. Wraz z artystami i artystkami tworzymy wystawę opierająca się na sztuce, która jest zarówno reakcją jak i działaniem wobec tego zwrotu. Nasz świat będzie istniał dopóki istnieje człowiek. Przejęcie odpowiedzialności za nasze działania to nasza szansa. Kuratorka: Marta Czyż Artystki i artyści: Yura Biley, Paweł Błęcki, Diana Grabowska, Bruno Althamer, Tymek Bryndal, Patrycja Cichosz, Adelina Cimochowicz, Jakub Danilewicz, Franciszek Drażba, Emilia Dudziec, Karolina Gardzilewicz, Ewa Goral, Tomek Haładaj, Łukasz Horbów, Aleksandra Jagła, Jakub Jakubowicz, Ida Karkoszka, Karolina Konopka, Agata Lankamer, Julia Łukasiak, Katarzyna Malejka, Paweł Marcinek, Gabriela Matuszewska, Maria Nova, Aleksandra Nowakowska, Kolektyw Łaski, Szymon Popielec, Tomasz Paszkowicz, Patryk Różycki, Aleksandra Sarna, Kuba Stępień, Natalia Sucharek, Kacper Szalecki

  • Prezentacja instalacji artystycznej "Mam dla Ciebie moje serce" na wystawie zbiorowej „WETWARE: PROLIFERACJA I PRZECZUCIE” w Instytucie Cybernetyki Sztuki
    • Patryk Różycki
    2020

    „WETWARE: PROLIFERACJA I PRZECZUCIE” Marcin Bożek, Marta Branicka, Flora Ćwirko + Jan Maurycy Adamski, Jowan Czerkas, Urszula Dulewicz, Dorota Grubba Thiede + Danuta Ćwirko Godycka, Tomasz Kopcewicz, Marta Koniarska, Maria Krupa, Monika Krygier + Stefan Krygier + Włodzimierz Pietrzyk, Przemysław Kryszk, Ryszard Ługowski, Krzysztof Malec, Anna Malinowska, Andrzej Egon Fietke Miastkowski, Piotr Tadeusz Mosur, Mateusz Pęk, Katarzyna Podpora, Marek Rogulski, Magdalena Rosman, Patryk Różycki, Wojtek Sosnowski, Urszula Śliz, Xenia Uranova, Marcelo Zammenhoff, Sofia Żezmer.

  • PREZENTOWANIE WYNIKÓW BADAŃ A JAKOŚĆ POMIARÓW
    • Piotr Konieczka
    2020 Analityka: Nauka i Praktyka

    Sposób przedstawiania wyników analiz bardzo często nie odzwierciedla jakości ich otrzymania. Nawet bardzo pobieżna analiza chemicznej literatury naukowej pozwala stwierdzić, że brak jest korelacji pomiędzy starannością otrzymywania wyników (system zapewnienia i kontroli jakości uzyskiwanych wyników) a formą ich prezentacji. W pracy zwrócono uwagę na bardzo często pojawiające się w tym zakresie błędy wraz z ich dyskusją i rozwiązaniami poprawnymi.

  • Principles and Practices of Corporate Governance in the Global Economy
    • Alessandro Minichilli
    • Fabio Quarato
    • Luciano Segreto
    2020

    The book places ownership at the centre of all relevant choices that the company makes. In particular, it addresses the issue of governance from the perspective of ownership, and in a broader and more articulated sense than most Anglo-Saxon studies do. The authors analyse the relationship between ownership, governance, and corporate strategy, with a dual objective. On the one hand, the aim is to identify the consistency relationships between the governance structure of the company and its results, because of the centrality that it assumes with respect to many of the strategic choices that companies make. On the other hand, the objective is to consider possible variants to the "basic scheme", going to investigate the role of ownership, governance and management from a contingency perspective, i.e. in different types of enterprise: public companies, multinational enterprises, state-owned enterprises, and especially family-owned enterprises are analysed. The second part of the book analyzes, in a number of advance economies (USA, UK, Germany, France, Italy, and Japan) as well in some emerging countries (China, India, Brazil, and Argentina), and two transition economies (Russia and Poland), capitalism models, different economic and business cultures, and their role in shaping the type of corporate governance that has emerged in the last thirty years.

  • PRINCIPLES OF ARTIFICIAL INTELLIGENCE APPLICATION IN CONTROL OF THE ENTERPRISE
    • Oleksandr Melnychenko
    2020 Pełny tekst BULLETIN OF THE CHERKASY BOHDAN KHMELNYTSKY NATIONAL UNIVERSITY. ECONOMIC SCIENCES

    The implementation of the tasks of evaluating historical financial information, the control or audit of business activities are based primarily on professional judgments about the object of study of a professional accountant or auditor. Their findings are drawn on the basis of the study of documents, the use of audit evidence, risk assessment, etc. There is always a probability (and rather high) that professional judgment will be based on incomplete information (since the dynamics of information changes is extremely high today), on the misstatements (since it is impossible to trace all the changes in knowledge related to the object of study), regardless of the quality of the performance of these individuals. In addition, the auditor often takes subjective decisions (for example, when choosing individual elements for the assessment from the general population), which also affects the degree of objectivity of his assessments. Artificial intelligence is the tool that could handle the entire set of knowledge, track all changes in the significant and important information, as well as in the insignificant and unimportant (which, however, also has an effect on the object of analysis). It does not have a work schedule or other restrictions on the time of work, so the comparison and analysis of information can be carried out around the clock, and the speed of data processing is determined by the processing power of the information systems, on which it operates, and is stably high. In this case, artificial intelligence is ready to perform the tasks non-stop in real time till receiving the command of termination the process.

  • Probabilistic seismic assessment of RC box-girder highway bridges with unequal-height piers subjected to earthquake-induced pounding
    • Hossein Rezaei
    • Seyyed Amirhossein Moayyedi
    • Robert Jankowski
    2020 Bulletin of Earthquake Engineering

    This paper uses the probabilistic seismic assessment to study the effects of pounding and irregularity on the seismic behavior of typical concrete box-girder bridges with four levels of altitudinal irregularity. To extend the results for all bridges in the same class, uncertainty related to the earthquake, structural geometries, and materials are considered. Pounding is likely to take place in two cases: the first one concerns the seat-type abutments, and the second is at the in-span hinge of multi-frame bridges. Accordingly, the present study is an attempt to investigate the behavior of irregular bridges considering the effects of pounding in both cases. In the first case, the effects of changes in the gap size on Engineering Demand Parameters (EDPs) were investigated. Then, correlations between earthquake parameters and the pounding force were evaluated. Furthermore, the pounding force exerted on the abutment was compared for different bridge irregularity levels. In the second part of the paper, the effects of pounding of adjacent bridge segments in the decks of non-continuous bridges were studied for equivalent Two-Degree-of-Freedom (2DOF) structures, for which the probability of non-occurrence was estimated. In the end, the relationship between structural or seismic parameters and the pounding force was evaluated in case of pounding. The results of the study show that the gap size between the abutment and the deck has the highest effect on the abutment passive deformation, pounding force, and base shear. Also, the substructure irregularity of bridges reduces the correlation between the gap size and the EDPs, except for the column ductility. Moreover, decreasing the ratio of periods of the adjacent frames diminishes the effect of the type of the earthquake but increases the probability of pounding.