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Gdańsk University of Technology

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  • Continuum wave functions for estimating the electric dipole moment: Calculation based on a multiconfiguration Dirac-Hartree-Fock approximation
    • Paweł Syty
    • Józef Eugeniusz Sienkiewicz
    • Laima Radžiūtė
    • Gediminas Gaigalas
    • Pavel Rynkun
    • Jacek Bieroń
    2019 Full text PHYSICAL REVIEW A

    The multiconfiguration Dirac-Hartree-Fock method is employed to calculate the continuum electron wave functions, which are then used to estimate their contribution to the atomic electric dipole moment (EDM) of 129Xe. The EDM arises from (P,T)-odd electron-nucleon tensor-pseudotensor and pseudoscalar-scalar interactions, the nuclear Schiff moment, the interaction of the electron electric dipole moment with nuclear magnetic moments, and atomic electric dipole matrix elements. In addition to being estimated in the continuum states, all of these interactions are also estimated in the ground state, as well as in the Rydberg states of 129Xe. Calculations of one-electron atomic orbitals include the interelectronic interactions, through valence and core-valence electron correlation effects. The contribution to the EDM from continuum states is found to be of the same order of magnitude as the contribution from discrete states.

  • Control of a vapour microturbine set in cogeneration applications
    • Wojciech Włodarski
    2019 Full text ISA TRANSACTIONS

    Systems with microturbines are implemented for local generation of heat and electricity. This paper presents the analysis of control concepts for a vapour microturbine set with a generator with permanent magnets, intended to work in small heat and power plants. Control system variants differed by the selection of controlled signals and set parameters. Possible ways of control were discussed and compared with experimentally determined static characteristics of the microturbine set. The simulation calculations were performed to check the control systems operation in various expected operating conditions.

  • Co-operation with local stakeholders: a crucial element of urban design
    • Anna Golędzinowska
    • Małgorzata Kostrzewska
    2019 Full text World Transactions on Engineering and Technology Education

    In this article,the authors endeavour to illustratethe evolution of the role of local stakeholder in teaching urban planning by example of selected experiences in the Faculty of Architecture atGdańsk University of Technology(FA-GUT), Gdańsk, Poland. The timeframe covers the period from the political breakthrough in 1989 to the present. The background is composed of the social, economic and legal changes that have taken place over the years in Poland. The authors also attempt to identify the present local stakeholders; the value of co-operation for the education process; and the added value each can bring.

  • Copper and cobalt co-doped ceria as an anode catalyst for DIR-SOFCs fueled by biogas
    • Beata Bochentyn
    • Mikołaj Chlipała
    • Maria Gazda
    • Sea-Fue Wang
    • Piotr Jasiński
    2019 Full text SOLID STATE IONICS

    The nanocrystalline compounds of Co and Cu co-doped ceria (with up to 20 mol.% of dopants) were fabricated by the reverse microemulsion synthesis method. They were deposited in a form of layers on the surface of SOFC anode in an aim to act as electrochemically active materials for biogas reforming process. Fourier Transformed Infrared Spectroscopy was used to analyze a composition of outlet gases simultaneously with the tests of electrical parameters of a fuel cell. It allowed comparing a catalytic activity of fabricated materials towards internal biogas reforming. It was found that Cu and Co ceria co-doping improves electrical parameters of a fuel cell and enhances its long-term stability when compared with mono-doped ceria. This type of a material gives also the highest conversion rate of methane and the highest yield of carbon monoxide.

  • Cops, a fast robber and defensive domination on interval graphs
    • Dariusz Dereniowski
    • Tomáš Gavenčiak
    • Jan Kratochvíl
    2019 Full text THEORETICAL COMPUTER SCIENCE

    The game of Cops and ∞-fast Robber is played by two players, one controlling c cops, the other one robber. The players alternate in turns: all the cops move at once to distance at most one each, the robber moves along any cop-free path. Cops win by sharing a vertex with the robber, the robber by avoiding capture indefinitely. The game was proposed with bounded robber speed by Fomin et al. in “Pursuing a fast robber on a graph”, generalizing a well-known game of Cops and Robber which has robber speed 1. We answer their open question about the computational complexity of the game on interval graphs with ∞-fast robber, showing it to be polynomially decidable. We also generalize the concept of k-defensive domination introduced by Farley and Proskurowski in “Defensive Domination” to A--defensive domination and use it as a main tool in our proof. The generalization allows specifying arbitrary attacks and limiting the number of defenders of each vertex. While this problem is NP-complete even for split graphs, we show that A-defensive domination is decidable in polynomial time on interval graphs.

  • CORPORATE BANKRUPTCY PREDICTION IN POLAND AGAINST THE BACKGROUND OF FOREIGN EXPERIENCE
    • Błażej Prusak
    2019 Full text Financial Internet Quarterly

    In highly developed countries, research in the field of bankruptcy risk prediction has been conducted for many years. For example, in the United States, which can be considered a pioneering country, the first publications appeared in the early twentieth century. In Poland, due to political and economic reasons, the interest in this issue dates back to the early 1990s. For this reason, this publication attempts to answer the following questions: 1) What is the level of advancement of the research into predicting bankruptcies of enterprises in Poland? 2) How does it compare to worldwide trends? Therefore, the main aim of this study is to present and evaluate the scientific achievements of Polish authors in the field of corporate bankruptcy prediction and compare them to global trends. Literature analysis was adopted as the research method and shows that initially in Poland only very simple tools were used to assess the risk of bankruptcy of enterprises. With time, however, advanced methods began to be introduced and new models included non-financial variables. Also, research on the selection of the samples was conducted. Currently, the level of research and applied tools do not differ from those used in highly developed countries.

  • CORPORATE BANKRUPTCY PREDICTION IN POLAND AGAINST THE BACKGROUND OF FOREIGN EXPERIENCE
    • Błażej Prusak
    2019 Full text Financial Internet Quarterly

    In highly developed countries, research in the field of bankruptcy risk prediction has been conducted for many years. For example, in the United States, which can be considered a pioneering country, the first publications appeared in the early twentieth century. In Poland, due to political and economic reasons, the interest in this issue dates back to the early 1990s. For this reason, this publication attempts to answer the following questions: 1) What is the level of advancement of the research into predicting bankruptcies of enterprises in Poland? 2) How does it compare to worldwide trends? Therefore, the main aim of this study is to present and evaluate the scientific achievements of Polish authors in the field of corporate bankruptcy prediction and compare them to global trends. Literature analysis was adopted as the research method and shows that initially in Poland only very simple tools were used to assess the risk of bankruptcy of enterprises. With time, however, advanced methods began to be introduced and new models included non-financial variables. Also, research on the selection of the samples was conducted. Currently, the level of research and applied tools do not differ from those used in highly developed countries.

  • Corrosion Inhibition Mechanism and Efficiency Differentiation of Dihydroxybenzene Isomers Towards Aluminum Alloy 5754 in Alkaline Media
    • Jacek Ryl
    • Mateusz Brodowski
    • Marcin Kowalski
    • Wiktoria Lipińska
    • Paweł Niedziałkowski
    • Joanna Wysocka
    2019 Full text Materials

    The selection of efficient corrosion inhibitors requires detailed knowledge regarding the interaction mechanism, which depends on the type and amount of functional groups within the inhibitor molecule. The position of functional groups between different isomers is often overlooked, but is no less important, since factors like steric hinderance may significantly affect the adsorption mechanism. In this study, we have presented how different dihydroxybenzene isomers interact with aluminum alloy 5754 surface, reducing its corrosion rate in bicarbonate buffer (pH = 11). We show that the highest inhibition efficiency among tested compounds belongs to catechol at 10 mM concentration, although the differences were moderate. Utilization of novel impedance approach to adsorption isotherm determination made it possible to confirm that while resorcinol chemisorbs on aluminum surface, catechol and quinol follows the ligand exchange model of adsorption. Unlike catechol and quinol, the protection mechanism of resorcinol is bound to interaction with insoluble aluminum corrosion products layer and was only found efficient at concentration of 100 mM (98.7%). The aforementioned studies were confirmed with Scanning Electron Microscopy and X-ray Photoelectron Spectroscopy analyses. There is a significant increase in the corrosion resistance offered by catechol at 10 mM after 24 h exposure in electrolyte: from 63 to 98%, with only negligible changes in inhibitor efficiency observed for resorcinol at the same time. However, in the case of resorcinol a change in electrolyte color was observed. We have revealed that the differentiating factor is the keto-enol tautomerism. The Nuclear Magnetic Resonance (NMR) studies of resorcinol indicate the keto form in structure in presence of NaOH, while the chemical structure of catechol does not change significantly in alkaline environment.

  • Corrosion Inhibition of Aluminium Alloy AA6063-T5 by Vanadates: Local Surface Chemical Events Elucidated by Confocal Raman Micro-Spectroscopy
    • Dmitry Kharitonov
    • Jens Sommertune
    • Cem Örnek
    • Jacek Ryl
    • Irina Kurilo
    • Per Claesson
    • Jinshan Pan
    2019 Full text CORROSION SCIENCE

    Chemical interactions between aqueous vanadium species and aluminium alloy AA6063-T5 were investigated in vanadate-containing NaCl solutions. Confocal Raman and X-ray photoelectron spectroscopy experiments were utilised to gain insight into the mechanism of corrosion inhibition by vanadates. A greenish-grey coloured surface layer, consisting of V+4 and V+5 polymerized species, was seen to form on the alloy surface, especially on top of cathodic micrometre-sized IMPs, whereby suppressing oxygen reduction kinetics. The results suggest a two-step mechanism of corrosion inhibition in which V+5 species are first reduced to V+4 or V+3 species above cathodic IMPs, and then oxidized to mixed-valence V+5/V+4 polymerized compounds.

  • Cost Analysis of Prefabricated Elements of the Ordinary and Lightweight Concrete Walls in Residential Construction
    • Marzena Kurpińska
    • Beata Grzyl
    • Adam Kristowski
    2019 Full text Materials

    Global economic growth causes an increase in natural resources exploitation, particularly in construction branch. The growing use of electricity contributes to climate change. Therefore, it is necessary to search the solutions, which will allow for reducing natural resources exploitation. One of the many opportunities to do that is the application of the recycled materials. The authors of the given article have analyzed three variants of construction solutions. One of them was the production of the walls of a building from reinforced concrete prefabricates with styrofoam insulation layer. The second variant for analysis were prefabricated walls from lightweight concrete, made of sintered clay aggregate with a foam core. The third proposed variant was a system of multi-layered walls, which was made of lightweight concrete with granulated expanded glass aggregate (GEGA). The main objective of the research was to assess the use of lightweight GEGA prefabricates, focusing on economic and technological aspects of the solution. The authors have analyzed the entire construction costs; ceilings and stairs were assumed as reinforced concrete elements. In calculations, the weight of the elements was taken into account, as well as transportation and mounting costs. On the basis of this cost analysis, it was concluded that the use of prefabricated element, made of lightweight concrete with GEGA, could be a replacement for the solutions, widely applied until these days. The analysis has also shown that the use of prefabricates with GEGA is sensible from the economic viewpoint, as it allows for saving construction time. Moreover, the solutions, proposed here, allow for saving natural resources and assuming a more environmentally friendly and caring attitude.

  • Coupling of Blood Pressure and Subarachnoid Space Oscillations at Cardiac Frequency Evoked by Handgrip and Cold Tests: A Bispectral Analysis
    • Marcin Gruszecki
    • Yurii Tkachenko
    • Jacek Kot
    • Marek Radkowski
    • Agnieszka Gruszecka
    • Krzysztof Basiński
    • Monika Waskow
    • Wojciech Gumiński
    • Jacek Anand
    • Jerzy Wtorek
    • Andrzej F. Frydrychowski
    • Urszula Demkow
    • Pawel Winklewski
    2019 Advances in Experimental Medicine and Biology

    The aim of the study was to assess blood pressure–subarachnoid space (BP–SAS) width coupling properties using time–frequency bispectral analysis based on wavelet transforms during handgrip and cold tests. The experiments were performed on a group of 16 healthy subjects (F/M; 7/9) of the mean age 27.2 ± 6.8 years and body mass index of 23.8 ± 4.1 kg/m². The sequence of challenges was first handgrip and then cold test. The handgrip challenge consisted of a 2-min strain, indicated by oral communication from the investigator, at 30% of maximum strength. The cold test consisted of 2 min of hand immersion to approximately wrist level in cold water of 4 °C, verified by a digital thermometer. Each test was preceded by 10 min at baseline and was followed by 10-min recovery recordings. BP and SAS were recorded simultaneously. Three 2-min stages of the procedure, baseline, test, and recovery, were analyzed. We found that BP–SAS coupling was present only at cardiac frequency, while at respiratory frequency both oscillators were uncoupled. Handgrip and cold test failed to affect BP–SAS cardiac–respiratory coupling. We showed similar handgrip and cold test cardiac bispectral coupling for individual subjects. Further studies are required to establish whether the observed intersubject variability concerning the BP–SAS coupling at cardiac frequency has any potential clinical predictive value.

  • Criteria for evaluation and selection of the best offer for the Contract Engineer service
    • Beata Grzyl
    • Magdalena Apollo
    • Heyducki Igor
    2019 Full text IOP Conference Series: Materials Science and Engineering

    The purpose of the legal regulations regarding public procurement in EU countries is to ensure effective funds' spending. When assessing and selecting the best offer, the contracting entities have at their disposal many different criteria, including non-price criteria. Their proper selection and application is necessary to ensure the high quality of the ordered product, delivery or service. Making an order for intellectual services, including performed by the Contract Engineer (CE), should be based primarily on the criterion of qualifications and experience. The actions and decisions taken by CE are particularly important for the quality and timeliness of the contract. The purpose of the research is to indicate to what scope and extent the awarding entities in Poland use the possibility of a wide selection of different criteria for the evaluation of intellectual services, consisting of performing the CE function. On the basis of selected proceedings, the authors discuss the criteria for evaluation and selection of the best offer applied in practice, classify them, analyze and evaluate them. The results of the conducted research indicate that the price and experience are often used in practice as the CE selection criteria. The authors, however, give numerous examples of other criteria. In many cases, these criteria are difficult to verify at the stage of evaluating offers and enforcing them in practice in course of works, raising doubts as to their effectiveness, sometimes making it impossible to make a reliable assessment and select the most advantageous offer. The authors indicate that despite many possibilities offered by the legal status in force in Poland, in practice, in some cases, criteria that have a large impact on the increase of the proposed service price, but not reflected in its quality, apply. As a consequence, it results in the lack of effective spending of public funds.

  • Critical review of electronic nose and tongue instruments prospects in pharmaceutical analysis
    • Wasilewski Tomasz
    • Dorian Migoń
    • Jacek Gębicki
    • Wojciech Kamysz
    2019 ANALYTICA CHIMICA ACTA

    Electronic nose (enose, EN) and electronic tongue (etongue, ET) have been designed to simulate human senses of smell and taste in the best possible way. The signals acquired from a sensor array, combined with suitable data analysis system, are the basis for holistic analysis of samples. The efficiency of these instruments, regarding classification, discrimination, detection, monitoring and analytics of samples in different types of matrices, is utilized in many fields of science and industry, offering numerous practical applications. Popularity of both types of devices significantly increased during the last decade, mainly due to improvement of their sensitivity and selectivity. The electronic senses have been employed in pharmaceutical sciences for, among others, formulation development and quality assurance. This paper contains a review of some particular applications of EN and ET based instruments in pharmaceutical industry. In addition, development prospects and a critical summary of the state of art in the field were also surveyed.

  • Cross sections for electron collision with pyridine [C5H5N] molecule
    • Czesław Szmytkowski
    • Sylwia Stefanowska-Tur
    • Natalia Tańska
    • Bożena Żywicka
    • Elżbieta Ptasińska-Denga
    • Paweł Możejko
    2019 MOLECULAR PHYSICS

    The absolute grand -total cross section (TCS) for electron scattering from pyridine, C5H5N, molecules has been measured at impact energies from 0.6 to 300 eV in the linear electron-transmission experiment. The obtained TCS energy dependence appears to be typical for targets of high electric-dipole moment; the cross section generally decreases with rising energy, except for the 3–20 eV range, where a broad enhancement peaked near 8.5 eV is clearly visible. Below 10 eV, some weak structures which can be attributed to resonant scattering processes are also discernible. The present TCS energy dependence is compared with TCS experimental data reported very recently. Comparison with TCS for benzene is also made to search how the replacement of the CH group in the benzene ring with the nitrogen atom influences the electron-scattering process. In addition, for pyridine and its halogenated derivatives: 2-chloropyridine [2-C5H4ClN] and 2-bromopyridine [2-C5H4BrN], integral elastic (ECS) and ionisation (ICS) cross sections have been calculated at intermediate and high electron-impact energies within semiempirical approaches. For pyridine the sum of ECS and ICS is in reasonable agreement with the measured TCS above 40 eV.

  • Cross-Bonding of MV Cable Lines for Energy Losses Decrease
    • Krzysztof Dobrzyński
    • Zbigniew Lubośny
    • Jacek Klucznik
    • Dominik Falkowski
    • Janusz Grala
    • Sławomir Noske
    2019 Full text Acta Energetica

    Currently, almost all medium voltage cable lines (MV) operate with the return wires earthed at both ends of the cable. Such a way of operation causes that during normal states of operation as well as during disturbances, e.g. short-circuits, in the return wires induce currents whose values mainly depend on the currents flowing in the phase wires. These currents in normal operating states are a source of additional energy losses incurred in the MV cables. The effect can be decreased by the return wires cross-bonding or the phase wires transposition. The paper discusses the potential effects that can be achieved by use of the return wires cross-bonding or the phase wires transposition in the domestic grids.

  • Crossover from charge density wave stabilized antiferromagnetism to superconductivity in Nd1−xLaxNiC2 compounds
    • Marta Roman
    • Leszek Litzbarski
    • Tomasz Klimczuk
    • Kamil Kolincio
    2019 Full text PHYSICAL REVIEW B

    The path from the charge density wave antiferromagnet NdNiC2 to the noncentrosymmetric superconductor LaNiC2 is studied by gradual replacement of Nd by La ions. The evolution of physical properties is explored by structural, magnetic, transport, magnetoresistance, and specific heat measurements. With the substitution of La for Nd, the Peierls temperature is gradually suppressed, which falls within the BCS mean-field relation for chemical pressure with a critical concentration of xc=0.38. As long as the charge density wave (CDW) is maintained, the antiferromagnetic (AFM) ground state remains robust against doping and, despite a Néel temperature reduction, shows a rapid and sharp magnetic transition. Once the CDW is completely suppressed, intermediate compounds of the Nd1−xLaxNiC2 series reveal symptoms of a gradual softening of the features associated with the AFM transition and an increase of the spin disorder. Immediately after the antiferromagnetic transition is depressed to zero temperature, the further incorporation of La ions results in the emergence of superconductivity. This crossover in Nd1−xLaxNiC2 is discussed in terms of the possible quantum critical point.

  • Cross-talk Between the Heart and Arteries in Older 65+ Adults
    • Tomasz Wierzba
    • Stanisław Zajączkowski
    • Paweł Figarski
    • Robert Olek
    • Artur Poliński
    2019

    Regulatory synchronization between the heart and the arterial walls is essential for optimal blood delivery to tissues. We investigated functional coherence between heart rhythm and aortic wall compliance in 30 volunteers aged 65 – 74. ECG and carotid and iliac pulse-wave were recorded and digitized at 2 kHz. Carotid-femoral pulse-wave transit time (cfTT) which reflex aortic compliance was assessed using the intersecting tangent algorithm at time-point of the maximal upstroke of the second derivative of the filtered pulse signal. Time-series of 256 heart cycles were used for heart rate variability (HRV) and cfTT variability analysis. Averaged power spectral density (aPSD) was estimated within selected frequency ranges by fast Fourier transform (FFT) approach. Magnitude squared coherence (MSC) between the both spectra was estimated. All volunteers exhibited variable temporal patterns of both HRV and cfTT variability. aPSD was reduced along with decreasing of time-window from 60 to 240 s. High coherent states between HRV and cfTT variability were observed as a short time prominent MSC peaks in almost all participants. Individual patterns of irregular MSC changes in time but not a generalized model of its fluctuations seem to reflect dynamic functional interaction between the heart and aortic compliance at an advanced age.

  • Crowdsourcing-Based Evaluation of Automatic References Between WordNet and Wikipedia
    • Julian Szymański
    • Tomasz Maria Boiński
    2019 Full text INTERNATIONAL JOURNAL OF SOFTWARE ENGINEERING AND KNOWLEDGE ENGINEERING

    The paper presents an approach to build references (also called mappings) between WordNet and Wikipedia. We propose four algorithms used for automatic construction of the references. Then, based on an aggregation algorithm, we produce an initial set of mappings that has been evaluated in a cooperative way. For that purpose, we implement a system for the distribution of evaluation tasks, that have been solved by the user community. To make the tasks more attractive, we embed them into a game. Results show the initial mappings have good quality, and they have also been improved by the community. As a result, we deliver a high quality dataset of the mappings between two lexical repositories: WordNet and Wikipedia, that can be used in a wide range of NLP tasks. We also show that the framework for collaborative validation can be used in other tasks that require human judgments.

  • Crystal structure and physical properties of a novel ternary compound La15MoxGe9
    • Joanna Blawat
    • Weiwei Xie
    • Robert J. Cava
    • Tomasz Klimczuk
    2019 CHEMICAL PHYSICS LETTERS

    We present the synthesis, structural characterization and physical properties measurements of a new compound, La15MoxGe9 in Mn5Si3-type derived structure with interstitial Mo. The sample was synthesized by arc-melting method. La15MoxGe9 crystallizes in non-centrosymmetric hexagonal structure P63mc (#186) with lattice parameters a = b = 15.495(5) Å and c = 6.917(2) Å. The refinement on single X-ray diffraction data show that interstitial atom Mo occupies two different Wyckoff positions (2a, 2b) with 0.19(2) Mo/per f.u. The specific heat properties were well studied. The obtained Sommerfeld coefficient and Debye temperature are: γ = 89.2(9) mJ/(mol K2) and ΘD = 190(5) K, respectively. La15MoxGe9 is the first compound in the ternary system La-Mo-Ge

  • Crystal structure, chemical bonding, and physical properties of layered AIrSn2 (A = Sr and Ba)
    • Madalynn Marshall
    • Lingyi Xing
    • Zuzanna Sobczak
    • Joanna Blawat
    • Tomasz Klimczuk
    • Rongying Jin
    • Weiwei Xie
    2019 JOURNAL OF MATERIALS SCIENCE

    We report the experimental and theoretical investigation of structure, chemical bonding interactions, and physical properties of new ternary stannides AIrSn2 (A = Sr and Ba). AIrSn2 (A = Sr and Ba) crystallizes in the orthorhombic Re3B-type structure with the space group Cmcm (No. 64). According to single-crystal X-ray diffraction results, the structure of AIrSn2 (A = Sr and Ba) can be considered as a Zintl-type compound with heterogeneous polyanionic [IrSn2]2− and A2+. The specific heat down to 1.8 K shows no evidence for bulk superconductivity in either SrIrSn2 or BaIrSn2. Electronic structure calculations, especially chemical bonding interactions in SrIrSn2 and BaIrSn2, match well with the observed structural stability and metallic nature.

  • Crystal structures of aminotransferases Aro8 and Aro9 from Candida albicans and structural insights into their properties
    • Agnieszka Kiliszek
    • Wojciech Rypniewski
    • Kamila Rząd
    • Sławomir Milewski
    • Iwona Gabriel
    2019 Full text JOURNAL OF STRUCTURAL BIOLOGY

    Aminotransferases catalyze reversibly the transamination reaction by a ping-pong bi-bi mechanism with pyridoxal 5′-phosphate (PLP) as a cofactor. Various aminotransferases acting on a range of substrates have been reported. Aromatic transaminases are able to catalyze the transamination reaction with both aromatic and acidic substrates. Two aminotransferases from C. albicans, Aro8p and Aro9p, have been identified recently, exhibiting different catalytic properties. To elucidate the multiple substrate recognition of the two enzymes we determined the crystal structures of an unliganded CaAro8p, a complex of CaAro8p with the PLP cofactor bound to a substrate, forming an external aldimine, CaAro9p with PLP in the form of internal aldimine, and CaAro9p with a mixture of ligands that have been interpreted as results of the enzymatic reaction. The crystal structures of both enzymes contains in the asymmetric unit a biologically relevant dimer of 55 kDa for CaAro8 and 59 kDa for CaAro9p protein subunits. The ability of the enzymes to process multiple substrates could be related to a feature of their architecture in which the active site resides on one subunit while the substrate-binding site is formed by a long loop extending from the other subunit of the dimeric molecule. The separation of the two functions to different chemical entities could facilitate the evolution of the substrate-binding part and allow it to be flexible without destabilizing the conservative catalytic mechanism.

  • Crystal structures of (E)-3-(4-hydroxybenzylidene)chroman-4-one and (E)-3-(3-hydroxybenzylidene)-2-phenylchroman-4-one
    • Kamil Suchojad
    • Anna Dołęga
    • Angelika Adamus-Grabicka
    • Elżbieta Budzisz
    • Magdalena Małecka
    2019 Full text Acta Crystallographica Section E CRYSTALLOGRAPHIC COMMUNICATIONS

    The synthesis and crystal structures of (E)-3-(4-hydroxybenzylidene)chroman-4-one, C16H12O3,I, and (E)-3-(3-hydroxybenzylidene)-2-phenylchroman-4-one,C22H16O3,II, are reported. These compounds are of interest with respect to biological activity. Both structures display intermolecular C—H---O and O—H---O hydrogen bonding, forming layers in the crystal lattice. The crystal structure of compound I is consolidated by pi–pi interactions. The lipophilicity (logP) was determined as it is one of the parameters qualifying compounds as potential drugs. The logP value for compound I is associated with a larger contribution of C---H interaction in the Hirshfeld surface.

  • (CsX)Cu5O2(PO4)2 (X = Cl, Br, I): A Family of Cu2+ S = 1/2 Compounds with Capped-Kagomé Networks Composed of OCu4 Units
    • Michał Jerzy Winiarski
    • Thao Tran
    • Juan Chamorro
    • Tyrel McQueen
    2019 Full text INORGANIC CHEMISTRY

    Three new salt inclusion compounds (CsX)Cu5O2(PO4)2 (X = Cl, Br, I), phosphate analogues of the kagomé mineral averievite, are reported. Their crystal structures are composed of trigonal networks of corner-sharing OCu4 anion-centered tetrahedra, forming capped-kagomé planes, which can also be regarded as two-dimensional slices along the [111] direction of a pyrochlore lattice. Magnetization and heat capacity measurements reveal strong geometric frustration of this network and complex magnetic behavior. X-ray and neutron diffraction studies show that all three compounds undergo a trigonal-to-monoclinic phase transition upon cooling, with a first-order phase transition seen in CsBr and CsI analogues. Along with the previously reported (CsCl)Cu5O2(VO4)2, these three new compounds belong to a large family of OCu4-based networks, which are a playground for studying frustrated quantum magnetism.

  • Cure Index demonstrates curing of epoxy composites containing silica nanoparticles of variable morphology and porosity
    • Farimah Tikhani
    • Maryam Jouyandeh
    • Seyed Jafari
    • Sara Chabokrow
    • Mehdi Ghahari
    • Kamaladin Gharanjig
    • Felix Klein
    • Norbert Hampp
    • Mohammad Ganjali
    • Krzysztof Formela
    • Mohammad Saeb
    2019 PROGRESS IN ORGANIC COATINGS

    An image was taken by Cure Index on curability of epoxy with silica nanoparticles having variable morphology and porosity. Three kinds of silica nanoparticles with non-porous curved-rod, non-porous spherical, and mesoporous spherical microstructures were synthesized and characterized by Fourier-transform infrared spectroscopy, scanning electron microscopy (SEM) and Brunauer–Emmett–Teller analyses. Epoxy nanocomposites containing 0.1, 0.3, 0.5 wt.% of nanoparticles cured nonisothermally in differential scanning calorimetry (DSC) at different heating rates and the glass transition temperature (Tg) for fully-cured samples was estimated. Cure Index unravelled the effect of nanoparticle morphology and porosity on epoxy crosslinking. Good cure was unconditionally the case for systems containing 0.3 wt.% of mesoporous spherical nanoparticles due to appropriate dispersion of porous nanoparticles, as captured by SEM. By contrast, dependency of curing on heating rate and nanoparticle loading in the case of non-porous spherical and curved-rod particles was evidenced by partially agglomerated domains. The state of nanoparticle-polymer interaction was also inferred in view of network formation in the presence of nanosilica particles of various morphology and porosity, which was nicely monitored by the use of Cure Index.

  • Curing epoxy resin with anhydride in the presence of halloysite nanotubes: the contradictory effects of filler concentration
    • Maryam Jouyandeh
    • Zohre Karami
    • Omid Moini
    • Krzysztof Formela
    • Seyed Paran
    • Ali Jannesari
    • Mohammad Saeb
    2019 PROGRESS IN ORGANIC COATINGS

    Epoxy resins can be cured with a wide variety of curing agents such as amines and anhydrides, but anhydride curing would be more favorable for research purpose because of epoxy-anhydride curing taking place slowly at room temperature. Incorporation of natural nanosized minerals into epoxy is of environmental importance. Halloysite nanotubes (HNTs) display chemical properties similar to those of silica and alumina, and hydroxyl groups positioned somewhere in between or at the edge of HNTs layers give them potential to participate in epoxy ring-opening. Curing epoxy/anhydride systems containing HNTs at various concentrations (0.5, 1 and 2 wt.% based on 100 parts by weight of epoxy) via nonisothermal differential scanning calorimetry at three heating rates (5, 10 and 15 °C.min−1) is discussed here to study the effect of HNTs concentration on epoxy-anhydride curing reactions. The extent of crosslinking reaction was promoted at 0.5 and 1 wt.% of HNTs as a result of participation of hydroxyl groups of HNTs in epoxide ring-opening, while at 2 wt.% of HNTs a hindered curing was the case, which has been speculated on account of probable deactivation of anhydride curing agent by the internal surface of HNTs pursued by anhydride molecules diffusion into the lumen of HNTs.

  • Curing epoxy with electrochemically synthesized Zn Fe3-O4 magnetic nanoparticles
    • Maryam Jouyandeh
    • Jagar A. Ali
    • Mustafa Aghazadeh
    • Krzysztof Formela
    • Mohammad Saeb
    • Zahra Ranjbar
    • Mohammad Ganjali
    2019 PROGRESS IN ORGANIC COATINGS

    Cathodic electrodeposition (CED) was applied in synthesis of undoped and zinc (Zn) doped Fe3O4 nanoparticles. Changes in the lattice structure of nanoparticles were monitored using X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM) supported by dispersive X-ray spectrometry (EDS), and vibrating sample magnetometry (VSM). Detailed analyses explored the formation of ZnxFe3–xO4 nanoparticles with x ≈ 0.1, and relatively low coercivity and remanence of 11.71 Oe and 0.36 emu/g, respectively, demonstrating adequate superparamagnetic degree of Zn2+-doped Fe3O4 nanoparticles. Epoxy nanocomposites containing undoped and Zn2+-doped Fe3O4 were prepared at very low amount of nanoparticles (0.1 wt.% based on 100 parts by weight of epoxy) and subjected to nonisothermal differential scanning calorimetry (DSC) at different heating rates of 5, 10, 15, and 20 °C/min. Analyses based on Cure Index criterion were edivent that curability behavior of epoxy/amine systems was changed from Poor to Good state of cure by substitution of Zn2+ cations in Fe2+ sites in the Fe3O4 lattice. Nevertheless, curing state of epoxy nanocomposite was Poor at 20 °C/min regardless of nanoparticle type, which was inferred on account of progressive curing reaction of epoxy that expedited gelation and made crosslinking pertinent to diffusion.

  • Curing epoxy with ethylenediaminetetraacetic acid (EDTA) surface-functionalized Co Fe3-O4 magnetic nanoparticles
    • Maryam Jouyandeh
    • Mohammad Ganjali
    • Jagar A. Ali
    • Mustafa Aghazadeh
    • Isa Karimzadeh
    • Krzysztof Formela
    • Xavier Colom
    • Javier Cañavate
    • Mohammad Saeb
    2019 PROGRESS IN ORGANIC COATINGS

    In this work, the bulk and surface composition of Fe3O4 supermagnetic nanoparticles were modified for efficient epoxy curing. The bare, ethylenediaminetetraacetic acid (EDTA) capped, and cobalt (Co)-doped EDTA capped Fe3O4 nanoparticles were synthesized electrochemically. The crystalline structure and phase information, surface capping, morphology and magnetization behavior of nanoparticles were studied by X-Ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), field-emission scanning electron microscopy (FE-SEM) and vibrating sample magnetometer (VSM), respectively. A low amount of the prepared nanoparticle (0.1 wt.%) was used in preparation of epoxy nanocomposites. Nonisothermal differential scanning calorimetry (DSC) under different heating rates was performed to study the potential of nanoparticles in curing epoxy resin with an aliphatic amine. The heat release data on nanocomposites suggest that EDTA capped Co-doped Fe3O4 considerably improved the curing reaction between epoxy resin and the curing agent. Calculations based on Cure Index approved qualitatively a shift from Poor to Good cure by concurrent lattice and surface modifications of magnetic nanoparticles. It is bielived that the approach used in this work can pave the way to enhance curability of epoxy nanocomposites by the combined modification of bulk and surface of nanoparticles.

  • Current issues of functional safety and cybersecurity analysis of the industrial and critical infrastructures
    • Marcin Śliwiński
    • Kazimierz Kosmowski
    • Emilian Piesik
    2019 Full text TASK Quarterly

    This article addresses some functional safety assessment procedures with cybersecurity aspects in critical industrial installations with regard to the functional safety requirements specified in standards IEC 61508 and IEC 61511. The functional safety management includes hazard identification, risk analysis and assessment, specification of overall safety requirements and definition of safety functions. Based on the risk assessment results, the safety integrity level (SIL) is determined for consecutive safety functions. These functions are implemented within the industrial control system (ICS) and/or the distributed control system (DCS) that consists of the basic process control system (BPCS) and/or the safety instrumented system (SIS). The determination of the required SIL related to the required risk mitigation is based on the semi-quantitative evaluation method. Verification of the SIL for the considered architectures of the BPCS and/or the SIS is supported by probabilistic models with appropriate data and model parameters including cybersecurity related aspects. The proposed approach is illustrated on the example of critical industrial installations.

  • Customer Engagement Consequences for Firms
    • Katarzyna Żyminkowska
    • Nagaraj Samala
    • Edyta Gołąb-Andrzejak
    2019 Full text Journal of Emerging Trends in Marketing and Management

    Purpose: Customer engagement (CE) is a customers’ voluntary resource contribution to firms’ functions, and it goes beyond transactions during customers’ behavioral manifestations toward the brand or firm’s offerings or activities. The effective CE management requires to understand the potential CE effects, and leverage the potential benefit and threat of CE, however negative consequences or risks of CE have remained unexplored in existing literature. Therefore, this paper explores both negative and positive consequences of customer engagement for firms. Methodology: Based on computer-assisted telephone interviews with 402 firms operating in the field of consumer goods and services, descriptive statistics and structural equation modelling were used in this study. Findings: This study recognizes firm-level risks of CE associated with customer resource integration and reveals the linkages between those risks and firm-level benefits of engaging customers by firms. Originality/value: The paper proposes realistic view on firm-level consequences of CE and provides insights into how firms should manage CE by understanding the dark-side of CE resulting from integrating customers’ resources in business processes.

  • Cybersecurity in the Electricity Sector
    • Rafał Leszczyna
    2019

    This book offers a systematic explanation of cybersecurity protection of electricity supply facilities, including discussion of related costs, relevant standards, and recent solutions. The author explains the current state of cybersecurity in the electricity market, and cybersecurity standards that apply in that sector. He then offers a systematic approach to cybersecurity management, including new methods of cybersecurity assessment, cost evaluation and comprehensive defence.

  • Cyfryzacja przedsiębiorstw świadczących usługi komunalne - ocena przypadku
    • Marek Wirkus
    • Waldemar Kosiedowski
    2019

    Analizie poddano cyfryzację przedsiębiorstwa świadczącego usługi komunalne - Gdańskie Nieruchomości. W artykule zidentyfikowano obszary cyfryzacji przedsiębiorstwa, ich aktualny poziom cyfryzacji oraz potrzeby i kierunki dalszych działań. Omówiono czynniki zagrażające wdrażaniu cyfryzacji oraz sposoby przeciwdziałania. Jako metodę badawczą zastosowano obserwację uczestniczącą, ocenę przeprowadzono wg stanu na koniec roku 2018.

  • Cykl trzech performance 1. O byciu bratem, 2. O emanowaniu miłością, 3. O byciu ptakiem
    • Patryk Różycki
    2019

    Nie jestem „najlepszym” bratem, jestem słaby w byciu bratem, to mnie zasmuca. Zobaczyłem go z bliska, z bliska przez kilka dni: jego uśmiech, łzy, otwarte usta, dołeczki w policzkach i łyżeczkę, która tam przyciskała, widziałem jak pali papierosa, jak się garbi, zakrzywioną linię pleców, wobec względnie prostej krawędzi balkonowych drzwi i wobec jeszcze dalszych, prostych linii tyłu budowli sakralnej, widziałem jak zakrywa twarz kocem, jak mlaszcze przez sen, linię jego stóp, jak chodzi i podbiega, by iść równie szybko, jak ja, kiedy gdzieś się śpieszyliśmy, przypomniałem sobie kolano jego kiedyś kontuzjowane z blizną, ale to kiedyś, patrzyłem na jego nos, odrastające włosy na głowie, zakola, linie na czole, dłonie, byłem szczęśliwy, kiedy staliśmy obok siebie, paląc papierosa, może to jedyna czynność, którą mogliśmy wykonywać wspólnie, może to jedyna w życiu, i jeszcze prowadzenie auta, słuchałem jego głosu, widziałem, jak przygląda się ze zdziwieniem pistacjom, próbując się do nich dobrać, widziałem, jak robi nam frytki. Teraz, jedynie chwilę po jego odjeździe, przypominam go sobie w całości, czuję smutek, chcę płakać, chyba tęsknię za nim, pierwszy raz. Chciałbym być lepszym bratem, nie wiem, jak to się robi, pytałem go o to, podpowiedział mi, jakim być wobec niego, co robić. Zrobiliśmy razem mój nowy pokój, on zrobił najwięcej, będę tutaj z nim: z zagipsowanymi przez niego ścianami, z pomalowanym na biało sufitem, całą łazienką, z podłączoną pralką, z uszczelnionymi oknami i drzwiami, z jego ogromną pomocą, z tym całym wzruszeniem i echem piszczącej wersalki, którą rozkładał sobie do spania. Chciałbym być lepszym bratem, nie wiem, jak to się robi, mogę do niego zadzwonić i zapytać, chcę to robić! (Ten pierwszy skok w nowym miejscu dedykuję mojemu bratu)

  • Cztery algorytmy, które wstrząsnęły światem. Część II: Od czasu wykładniczego do wielomianowego
    • Marek Kubale
    2019 Pismo PG

    Odcinek ten poświęcony jest problemowi programowania liniowego oraz problemowi badania liczb pierwszych.

  • Cztery algorytmy, które wstrząsnęły światem. Część III: Sprzęt czy oprogramowanie
    • Marek Kubale
    2019 Pismo PG

    W ostatniej części tryptyku poruszamy problem przyjaznego rysowania grafów oraz prezentujemy algorytmy dla szybkiego mnożenia macierzy. Nasze rozważania kończymy ilustracją postępu w dziedzinie sprzętu i oprogramowania

  • Czujniki optyczne jako narzędzia analityczne do wykrywania i oznaczania jonów
    • Natalia Łukasik
    • Piotr Barczak
    2019 Chemia w Szkole

    Prawidłowe funkcjonowanie organizmu ludzkiego w dużej mierze opiera się na odpowiedniej równowadze jonowej. Jak wykryć i oznaczyć te jony?

  • Czy doświadczenie ma znaczenie? Intencje przedsiębiorcze potencjalnych sukcesorów z perspektywy społeczno-kognitywnej
    • Magdalena Licznerska
    2019

    Pomimo wielu różnorodnych działań mających na celu zachęcanie młodych osób do przedsiębiorczości, wielu z nich nie przejmuje firm rodzinnych, nie zostaje przedsiębiorcami, a znacznej części nie można nawet określić mianem osób przedsiębiorczych. Zrozumienie, co sprawia, że dana osoba staje się przedsiębiorcą, ma kluczowe znaczenie dla rozwoju nowych firm i przetrwania tych z dłuższą tradycją, firm rodzinnych. W związku z tym, że przedsiębiorczość jest zachowaniem intencjonalnym, istnieje potrzeba badania intencji przedsiębiorczych młodych osób, a w kontekście firm rodzinnych, potencjalnych sukcesorów. W niniejszym artykule została wprowadzona i wyjaśniona społeczno – kognitywna teoria kariery (SCCT). Wyjaśniono, dlaczego poprzednie modele analizy intencji przedsiębiorczości mogą być nieodpowiednie i dlaczego spojrzenie z perspektywy SCCT będzie bardziej właściwe do badania procesu formowania intencji przedsiębiorczych. Ujęcie w modelu konceptualnym kontekstu zewnętrznego umożliwia przeanalizowanie wpływu środowiska firmy rodzinnej na intencje przedsiębiorcze potencjalnych sukcesorów. Poczucie przedsiębiorczej samoskuteczności potencjalnych sukcesorów może być konstrukcją wyjaśniającą ich intencje przedsiębiorcze, ale także obok postrzeganych efektów przedsiębiorczych, może być jednym z mediatorów związku pomiędzy pochodzeniem z firmy rodzinnej i intencjami przedsiębiorczymi.

  • Czy fizyka może pomóc w rozwoju sztucznej inteligencji? (Czy sztuczna inteligencja pomoże w rozwoju fizyki?)
    • Beata Bochentyn
    2019 Full text

    Zaprezentowano możliwości zastosowania metod sztucznej inteligencji w rozwiązywaniu problemów z zakresu fizyki i inżynierii materiałowej

  • Czy ścieki oczyszczone stanowią istotne źródło farmaceutyków w środowisku wodnym?
    • Sylwia Fudala-Książek
    • Małgorzata Szopińska
    • Katarzyna Jankowska
    • Aneta Łuczkiewicz
    2019 Wodociągi Polskie

    Jak dotąd nie zostały jeszcze wprowadzone regulacje prawne dotyczące stopnia redukcji mikrozanieczyszczeń i/lub ich maksymalnych stężeń na odpływie z oczyszczalni. Niemniej jednak zgodnie ze stanowiskiem Komisji Europejskiej i innych organizacji, istnieje potrzeba ich monitoringu oraz dopracowania metod usuwania mikrozanieczyszczeń w celu poprawy jakości wód będących odbiornikiem ścieków oczyszczonych. Dlatego też zachęca się OŚ do wykonywania wstępnych analiz obecności mikrozanieczyszczeń na wejściu i wyjściu z oczyszczalni, oraz w wodach odbiornika w celu uzyskania szerokiej charakterystyki problemu. Nie bez znaczenia są również konsultacje społeczne i wzrost świadomości zagrożeń związanych z obecnością i stałą emisją mikrozanieczyszczeń, w tym farmaceutyków, do środowiska. Podjęcie działań związanych z implementacją zaawansowanych metod oczyszczania ścieków wymaga bowiem nie tylko analizy aspektów technologicznych ale również socjoekonomicznych. Wdrożenie w pełnej skali technologii ozonowania, czy adsorpcji na węglu aktywnym spowoduje bowiem wzrost kosztów eksploatacji oczyszczalni ścieków, a tym samym prawdopodobnie również opłat za wodę i ścieki. Z drugiej strony efektem długoterminowym wdrożenia zaawansowanych metod oczyszczania ścieków będzie podniesienia jakości życia mieszkańców oraz stworzenie ekologicznych podstaw do zrównoważonego rozwoju pobliskich środowisk. Jest to również pole do działania dla inżynierów i technologów i poszukiwania nowych, innowacyjnych, wysoce efektywnych technologii, które przy niskich kosztach inwestycyjnych i eksploatacyjnych pozwolą na zapewnienie bezpieczeństwa ekologicznego w przyszłości (np. wykorzystanie nowoczesnych materiałów w procesach elektrodowych). Bania zostały zrealizowane w ramach projektu MORPHEUS - Modelowe obszary usuwania farmaceutyków na południowym Bałtyku, ang. Model Areas for Removal of Pharmaceutical Substances In the South Baltic, realizowanego w ramach Programu Interreg Południowy Bałtyk nr STHB.02.02.00-SE-0038/16. Oznaczenia substancji farmaceutycznych zostały wykonane przez Ola Svahn i Erland Björklund w specjalistycznym laboratorium analitycznym na Uniwersytecie w Kristianstad (https://www.hkr.se).

  • Damage Detection in the Wind Turbine Blade Using Root Mean Square and Experimental Modal Parameters
    • Łukasz Doliński
    • Marek Krawczuk
    • Arkadiusz Żak
    2019

    The paper presents results of an experimental study related to a non-destructive diagnostic technique used for preliminary determination the location and size of delamination in composite coatings of wind turbine blades. The proposed method of damage detection is based on the analysis of the ten first mode shapes of bending vibrations, which correspond to displacements of rotor blades perpendicular to the rotor plane. Modal parameters depend on the physical properties of the structure. On the other hand, failures can affect these properties (e.g. locally reduce the stiffness of the structure). Monitoring of selected modal parameter can allow determination the technical condition of the structure. The main assumption of the presented method is a comprehensive analysis of the measured data by determination the root mean square value (RMS) for each measurement point from all forms of free vibration obtained from the experiment. As a result, information contained in all modes of vibrations that may indicate damage of the blade will be included in a single characteristic. The investigations were carried out on a scaled-down model of a wind turbine blade of a rotor diameter of 36 m. The modal parameters have been determined only experimentally using a Laser Doppler Scanning Vibrometer. Damage was simulated for three localizations by additional high stiffness elements fixed to the surface of the blade. The results of the research presented in this paper confirm the effectiveness of RMS calculation in detection damage using modes of vibrations.

  • DANE I DOKUMENTACJA MEDYCZNA
    • Jacek Rumiński
    2019

    Rozdział analizuje aspekty danych i dokumentacji medycznych z odniesieniu do międzynarodowych norm technicznych takich jak DICOM, HL7. Wskazuje również definicje dokumentacji medycznej związane z polskim prawem. Porusza również aspekty związane z kolekcjami danych (np. biobanki) jak i bezpieczeństwem danych.

  • Data librarian and data steward – new tasks and responsibilities of academic libraries in the context of Open Research Data implementation in Poland
    • Anna Wałek
    2019 Full text Przegląd Biblioteczny

    Thesis/Objective – The policy of Open Access (OA) for researching resources in Europe has been implemented for more than 10 years. The first recommendations concerning providing OA to scientific materials were defined during the implementation of the 7th Framework Programme. Introducing another set of recommendations concerning OA to research data was the next stage. The recommendations were transformed into obligations under the Horizon 2020 Programme. In 2018, research-funding institutions were associated in the Plan S document issued by CoalitionS ,which aims to ac celerate the transition to full and immediate OA to publications from publicly funded research until January 2021. Academic libraries have always been pioneers in implementing OA to research, creating the necessary tools (platforms and repositories), and preparing training workshops for researchers. OA policy implementation, including both access to research resources and data, is accelerating. That is why the role of academic libraries and academic librarians has become crucial. The article presents how library services and the scope of tasks of their employees change in connection with the introduction of open access policies for research data in Poland. Research methods – A critical review of the literature was used to analyse the content of foreign and Polish LIS literature published in the years 2009-2019. In addition, official documents issued by the European Commission were analysed, as well as websites devoted to Open Research Data (ORD). Results and conclusions – Some new specialisations in librarianship have been introduced – e.g. a data librarian who is responsible not only for academic staff training sessions on Open Research Data, but also for assistance for research teams in the field of data management and data curation. In the future, academic libraries will be responsible for coordinating the work of data stewards responsible for supporting the process of research data creating and managing at university departments and in research teams.

  • Database of speech and facial expressions recorded with optimized face motion capture settings
    • Andrzej Czyżewski
    • Miłosz Kawaler
    2019 Full text JOURNAL OF INTELLIGENT INFORMATION SYSTEMS

    The broad objective of the present research is the analysis of spoken English employing a multiplicity of modalities. An important stage of this process, discussed in the paper, is creating a database of speech accompanied with facial expressions. Recordings of speakers were made using an advanced system for capturing facial muscle motion. A brief historical outline, current applications, limitations and the ways of capturing face muscle motion as well as the problems with recording facial expressions are discussed. In particular, the scope of the present analysis concerns the registration of facial expressions related to emotions of speakers which accompany articulation. The camera system, instrumentation and software used for registration and for post-production are outlined. An analysis of the registration procedure and the results of the registration process was performed. The obtained results demonstrate how muscle movements can be registered employing reflective markers and point at the advantages and limitations of applying FMC (Face Motion Capture) technology in compiling a multimodal speech database. A short discussion pertaining to the usage of FMC as ground truth data source in facial expression databases concludes the paper.

  • Daylight evaluation for multi-family housing in Poland
    • Natalia Sokół
    2019 Full text

    This PhD dissertation focuses on methods of daylight appraisal useful in the design of the contemporary multifamily housing. The theoretical part of the thesis offers a review of daylight indicators, evaluations methods and tools within the built environment. It covers a review of daylight recommendations found in building standards and other normative documents affecting the design of the residential spaces. A pilot work survey carried out among 140 architecture students aimed to verify students', perception, preferences on daylight as well as their knowledge about contemporary daylight metrics and assessment methods and regulations. The empirical part of the thesis presents the experiment focused on the appraisal of daylight conditions within 20 rooms spaces via on-site repeated luminance measurements, the questionnaire focusing on inhabitants' perception, preferences and satisfaction with the daylight conditions within their dwellings, and luminance, illuminance simulation. The obtained results are presented in numerical form and graphical notation, in the form of multi-coloured graphs - images. In the summary, the potential and level of difficulty of the presented daylight appraisal methods were assessed. The influence of normative documents on the design solutions affecting propagation of light in the multi-dwelling structures was described. The results confirm that the analysis and assessment of daylight is crucial at all stages of planning residential architecture. A well-thought-out design of daylight affects the perception of residential interiors by their users and impacts their quality of life.

  • DAYLIGHT WITHIN A ROOM IN THE EYES OF ARCHITECTURE STUDENTS
    • Natalia Sokół
    • Giuliani Federica
    • Justyna Martyniuk-Pęczek
    2019

    A questionnaire was conducted to investigate how 140 architecture students apprise daylight conditions within the classrooms. The participants were requested to evaluate the luminous environment and their luminous comfort. They were also asked about light preferences and knowledge on daylight metrics and regulations. The students’ subjective appraisals results were compared with the experts’ assessment and the on-site illuminance measurements. Later on, the students had to carry out a series of daylight indices simulations summarizing daylight conditions in their private rooms (a user’s experience), and in a room, within a building, they had been designing (a designer’s experience). The perception of the luminous environment was analysed against participants’ comprehension of daylight simulations data. The issues students encountered during the daylight indicators analysis suggested that more coherent daylight education should be offered for future architects.

  • Debonding Detection in Reinforced Concrete Beams with the Use of Guided Wave Propagation
    • Beata Zima
    2019

    One of the most frequent damage of the reinforced concrete structures is debonding between steel bar and concrete cover. In the case of debonding occurrence not only the strength of the structure decreases, but also it is more vulnerable to corrosion damages. For this reason fast and effective methods of debonding detection in an early stage of its development need a significant boost. The paper presents analytical and experimental investigation of debonding detection in reinforced concrete beams using non-destructive method based on guided waves propagation. Concrete beams of rectangular cross-section consisting of four steel rebars with pre-existing debonding are investigated. Lack of adhesive connection between one rod and concrete cover is provided by introducing cellophane film of a small thickness (90 μm). The research is focused on detection of debonding with variable length on the basis of time-domain signals captured by piezoelectric sensors. Presented method of damage detection takes advantage of the time of flight of the reflections registered at the ends of the specimens.

  • Decision making process using deep learning
    • Olgun Aydin
    2019

    Endüstri 4.0, dördüncü endüstri devrimi veya Endüstriyel Nesnelerin İnterneti (IIoT) olarak adlandırılan sanayi akımı, işletmelere, daha verimli, daha büyük bir esneklikle, daha güvenli ve daha çevre dostu bir şekilde üretim yapma imkanı sunmaktadır. Nesnelerin İnterneti ile bağlantılı yeni teknoloji ve hizmetler birçok endüstriyel uygulamada devrim niteliği taşımaktadır. Fabrikalardaki otomasyon, tahminleyici bakım (PdM – Predictive Maintenance) modellerigibi gelişmeler işletmelere, iş modellerini değiştiren yenilikçi çözümler sunmaktadır. Günümüz endüstriyel uygulamalarında ihtiyaç duyulan yüksek otomasyon seviyesini sağlamak için, daha verimli ekipman kullanılmalı, daha akıllı sistemler oluşturulmalıdır. Bu sayede, hem üretimdeki verim artacak hem de daha güvenli bir çalışma ortamı da sağlanmış olacaktır. İşletmeler, üretimlerine minimum aksama süresiyle, optimum hızda devam etmek istemektedir. Bu sebeple, üretimde kullanılan, hareketli parçaları olan makinelerin daha verimli kullanılmasını sağlamak için yapılacak bakım planlamaları kritik önem taşımaktadır. Bu konu ile ilgili yaklaşımlardan bir tanesi, ekipmanların durumuna bakılmaksızın bakım süreçlerini sabit aralıklarla gerçekleştirmektir. Bu yöntem planlanması basit bir yöntemdir ancak, zaman zaman ekipmanların arızası gerçekleştikten sonra bakım işleminin gerçekleştirilmesine ya da ekipmanlarda hiç bir problem yokken bakım işleminin gerçekleştirilmesine neden olabilmektedir. Bu da sistemde uzun süreli aksamalar, gereksiz bakım maliyetleri gibi sonuçları doğurmaktadır. Bakım süreçlerine farklı bir yaklaşım olan PdM, makinenin gözlemlenen durumuna bağlı olarak bakım süreçlerinin yönetilmesine olanak kılmaktadır.PdM yaklaşımına yeni bir akış açısı getirmek amacıyla yapılan bu çalışmada yeni bir derin yapay sinir ağı mimarisi önerilmiştir. Bu mimaride bir girdi katmanı bir LSTM katmanı, bırakma (DO) ve ardından yine bir LSTM katmanı, bir gizli katman ve çıktı katmanı bulunmaktadır. Mimaride kullanılan iterasyon sayısı, parti büyüklüğü Genetik Algoritma (GA) kullanılarak, kayıp fonksiyonunu optimize eden optimizasyon algoritması, çıktı katmanında sonra kullanılan aktivasyon fonksiyonu ve DO oranı ızgara araması (GS) kullanılarak belirlenmiştir.

  • Decisional DNA based intelligent knowledge model for flexible manufacturing system
    • Syed Imran Shafiq
    • Edward Szczerbicki
    • Bogdan Trawiński
    • Cesar Sanin
    2019 JOURNAL OF INTELLIGENT & FUZZY SYSTEMS

    Modeling an effective mechanism for design and control strategies for the implementation of a flexible manufacturing system (FMS) has been a challenge. Consequently, to overcome this issue various techniques have applied in the past but most of these models are effective only for some specific situation or an element of FMS. In this study, the knowledge representation technique of Decisional DNA (DDNA) is applied to FMS to develop a generic model to achieve effective scheduling and manufacturing flexibility. Decisional DNA based Virtual Engineering Objects (VEO) are used as communicating media between machines, equipment and works pieces. The concept of Virtual Engineering Process (VEP) is applied for modeling routing flexibility. VEOs combined with VEPs form FMS-DDNA model, which facilitates in enhancing the performance of FMS, by inducing intelligence based on its own previous experience thus making it practical and smart.

  • Decisional-DNA Based Smart Production Performance Analysis Model
    • Syed Imran
    • Edward Szczerbicki
    • Cesar Sanin
    2019 Full text CYBERNETICS AND SYSTEMS

    n order to allocate resources effectively according to the production plan and to reduce disturbances, a framework for smart production performance analysis is proposed in this article. Decisional DNA based knowledge models of engineering objects, processes and factory are developed within the proposed framework. These models are the virtual representation of manufacturing resources, and with help of Internet of Things, are capable of capturing the past experience and formal decisions. A case study for the smart tool performance analysis is presented in which information of key tool parameters like tool life, surface integrity, tool forces and chip formation can be sensed in real-time, and predictions can be made according to specific requirements. This framework is capable of creating a cyber-physical conjoining of the bottom-level manufacturing resources and thus can work as a technological basis for smart factories and Industry 4.0.

  • Decontaminating Arbitrary Graphs by Mobile Agents: a Survey
    • Dorota Osula
    2019 UTILITAS MATHEMATICA

    A team of mobile agents starting from homebases need to visit and clean all nodes of the network. The goal is to find a strategy, which would be optimal in the sense of the number of needed entities, the number of moves performed by them or the completion time of the strategy. Currently, the field of distributed graph searching by a team of mobile agents is rapidly expanding and many new approaches and models are being presented in order to better describe real life problems like decontaminating danger areas by a group of robots or cleaning networks from viruses. A centralized searching, when a topology of a graph is known in advance is well studied. This survey presents comprehensive results focusing mainly on an issue of the distributed monotone contiguous decontamination problem, including recent results for clearing graphs with and without a priori knowledge about its topology. We introduce a bibliography for various models, which differ on e.g., knowledge about a graph, properties of agents, time clock or size of the available memory.

  • Decyzje przedsiębiorstwa na rynku finansowym
    • Gabriela Golawska-Witkowska
    • Ewa Mazurek-Krasodomska
    • Anna Rzeczycka
    2019

    Prowadzenie działalności gospodarczej, w tym realizowanie zamierzeń rozwojowych oraz bieżących, wiąże się z ryzykiem niezrealizowania wytyczonego celu. Oznacza to, że firma działa w warunkach ryzyka, a niekiedy niepewności. Główne ryzyka dotyczą utrudnień w pozyskaniu niezbędnych środków finansowych, wahań kursów walut, zmian stóp procentowych itp. Przedsiębiorstwo musi więc znaleźć miejsce, w którym firma pozyska niezbędne kapitały – własne i obce – oraz ograniczy generowane ryzyko. Może to zrobić na rynku finansowym, na określonych jego segmentach, w zależności od potrzeb. Niniejsza publikacja została poświęcona problematyce decyzji przedsiębiorstwa związanych z realizacją wytyczonych celów w kontekście pozyskiwania źródeł finansowania oraz minimalizowania ryzyka. Główne założenia pracy obejmują wskazanie zasad podejmowania przez przedsiębiorstwo decyzji na rynku finansowym oraz określenie miejsca instrumentów tego rynku w bilansach polskich przedsiębiorstw. Monografia przeznaczona jest dla studentów kierunków ekonomicznych, w szczególności studiujących zarządzanie finansami przedsiębiorstwa i pragnących poszerzyć wiedzę dotyczącą decyzji podejmowanych przez firmy na rynku finansowym.