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Gdańsk University of Technology

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  • Discrepancies in determination of biogenic amines in beer samples by reversed phase and hydrophilic interaction liquid chromatography coupled with tandem mass spectrometry
    • Katarzyna Nalazek-Rudnicka
    • Paweł Kubica
    • Andrzej Wasik
    2020 Full text MICROCHEMICAL JOURNAL

    Biogenic amines (BAs) are nitrogenous organic bases occurring mainly in fermented food and beverages as a result of free amino acids bacterial decarboxylation. The reversed phase liquid chromatography (RPLC) and hydrophilic interaction liquid chromatography (HILIC) based methods were compared in terms of usefulness for determination of BAs in beer samples. Analysis of BAs with the use of RPLC method were carried out after their derivatization with p-toluenesulfonyl chloride (tosyl chloride), while for HILIC one sample preparation consisted of only dilution. For RPLC method the limits of detection (LODs) and quantitation (LOQs) were in the range 0.54-4.3 ng/mL and 1.6–13 ng/mL, respectively. The obtained recoveries were from 75 to 125% with coefficient of variation (CV) less than 8%. The developed HILIC based method turned out to be less sensitive and not specific sufficiently for the determination of most BAs in native state in beer samples. In this case, the LODs and LOQs values were in the range 12-94 ng/mL and 35–290 ng/mL, respectively.The observed matrix effects during analysis of beer samples were significant enough to distort the BAs content. The obtained recoveries were often below 75% with CVs less than 11%. Finally, both developed methods were applied for analysis of BAs in samples of lager beers. Due to the low recoveries and strong influence of matrix the HILIC method could be only applied to qualitative analysis of some BAs in beer samples. Regardless of the relatively lengthy sample preparation for RPLC method (time of derivatization – 2h), it was proven that a derivatization reaction is required for such matrix as beer.

  • Discussing daylight simulations in a proposal for online daylighting education.
    • Federica Giuliani
    • Mandana Khanie, Sarey
    • Natalia Sokół
    • Niko Gentile,
    2020

    There is increasing interest concerning daylighting in the building sector. However, such knowledge is difficult to penetrate the curricula of architects and designers as existing educational programmes often do not provide sufficient training on BPS. This also leads to superficial use of daylight simulations. This paper presents a proposal for a needs-based education package on daylighting design, that mixes modular eLearning and an intensive summer school, called NLITED. The NLITED model includes modules on daylight simulation whose implementation (in eLearning key) can trigger a constructive discussion and receive valuable feedback from the Nordic community of BPS specialists.

  • Discussion of “Axisymmetric Simulations of Cone Penetration in Saturated Clay” by Diane M. Moug, Ross W. Boulanger, Jason T. DeJong, and Robert A. Jaeger
    • Jakub Konkol
    • Lech Bałachowski
    2020 Full text JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING

    N/A

  • Discussion of “CPT Evaluation of Yield Stress Profiles in Soils” by Shehab S. Agaiby and Paul W. Mayne
    • Lech Bałachowski
    2020 Full text JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING

    Veryfication of the procedure to estimate overconsolidation ratio in sands using the results of mini-cone penetration tests in centrifuge.

  • Discussion:Horizontal stress increase induced by deep vibratory compaction
    • K. Rainer Massarsch
    • Carl Wersäll
    • Bengt H. Fellenius
    • Lech Bałachowski
    • Norbert Kurek
    • Jakub Konkol
    2020 Full text PROCEEDINGS OF THE INSTITUTION OF CIVIL ENGINEERS-GEOTECHNICAL ENGINEERING

    Deep compaction control of granular material using the results of field tests. The analysis include the CPTU and DMT tests terformed before and after compaction works.

  • Displacement piles - classification and methods for the calculation of bearing capacity.
    • Paweł Więcławski
    • Kazimierz Gwizdała
    2020 Full text Przegląd Naukowy Inżynieria i Kształtowanie Środowiska

    Displacement piles belong to a group of technologies whose main idea is to install or make a pile without extracting ground material. According to definition, contained in PN-EN:1997-1:2008, displacement piles should be considered as driven, pressed in using vibrators and made with the use of spread augers. The classification of piles used so far with regard to the technology of execution is modified. An additional element is the emergence of new materials and plastics used in the construction of piles. The paper presents technological changes concerning not only the method of construction, but also the materials used. Another aspect is the methods of calculating the load-bearing capacity and settlement of piles. With acceptance for use the PN-EN:1997-1:2008 standard in 2010, it was necessary to change the approaches applied that based on many years of experience and tradition. The treatment of old methods was undertaken by defining coefficients allowing extrapolation of the load capacity from the range of critical values to the limit values. To a large extent these are empirical procedures. The main determinant in the process of designing and then verifying the load-bearing capacity of piles has been the determination of the force that causes settlement equal to 10% of the pile diameter. The best method in this case is to forecast the full load-settlement characteristics. The paper presents methods based on a hyperbolic model of the settlement curve, adopted mainly in tranformational functions, and a complex linear- exponential model, which reflects with high accuracy the cooperation of the substrate with displacement piles with a Increased base. On the basis of the collected data, a comparative analysis of particular displacement piles technologies was made. The characteristic elements of cooperation between the subsoil and piles were defined depending on the method of their execution. The usefulness of individual methods of load-bearing capacity calculation depending on the pile technology was determined.

  • Dissimilar underwater wet welding of HSLA steels
    • Jacek Tomków
    • Dariusz Fydrych
    • Grzegorz Rogalski
    2020 Full text INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY

    The high-strength low-alloy S460ML and S460N steels were chosen for underwater wet welding of dissimilar T-joints using covered electrodes. For improving the quality of joints, the temper bead welding (TBW) method was used. The application of TBW in pad welding conditions has been investigated earlier but the possibility of usage of this technique in welded joints was not analyzed. The main aim of the study was to check the influence of TBW on the hardness and structures of the heat-affected zone (HAZ) of dissimilar T-jointsmade in the underwater conditions. The experiments conducted showed that the technique used can reduce the susceptibility to cold cracking by decreasing the hardness in HAZ, which is a result of changes in its structure. The TBW technique reduced the hardness in the HAZ of the S460N steel by 40–50 HV10 and in S460ML by 80–100 HV10. It was also found that the changes in S460ML and S460N were much different, and therefore, the investigated technique can provide better results in the steel characterized by lower carbon equivalent CeIIW.

  • Dissociation of furan-2-carboxylic acid by low energy electrons
    • Mateusz Zawadzki
    • J Kočišek
    • Juraj Fedor
    2020 Full text Journal of Physics : Conference Series

    Electron attachment to molecular target can lead to a variety of negative fragment ions. We experi- mentally probe the main dissociative electron attachment channels in furan-2-carboxylic acid (C3H3O2 − COOH) - a molecular target composed of two important structural units: a furan ring and a carboxylic group. In our studies we utilise nearly mono-energetic electrons at electron energies from 0 eV up to 15 eV. Our detection setup is based on extraction lens system and quadrupole mass spectrometer, that enables measurement of the energy dependent mass-selected yields of newly formed stable anions.

  • Dissociative electron attachment to benzoic acid (C7H6O2)
    • Mateusz Zawadzki
    • P. Wierzbicka
    • J. Kopyra
    2020 Full text JOURNAL OF CHEMICAL PHYSICS

    The dissociative electron attachment (DEA) to benzoic acid (C6H5COOH) has been studied using an experimental crossed beam setup of a quadrupole mass spectrometer and a trochoidal electron monochromator. Relative partial cross sections for the DEA to produce negative ion fragments show the main channels for dissociation. The comparison of the present results with the ultraviolet photoelectron spectrum of benzoic acid [J. Meeks, A. Wahlborg, and S. P. McGlynn, J. Electron Spectrosc. Relat. Phenom. 22, 43 (1981)] implies that most DEA bands in the high energy range are due to Feshbach resonances with double occupation of diffuse Rydberg-like orbitals. The measurements are supported by density functional theory calculations of the threshold energies.

  • Dissociative photo-double-ionization of the isoxazole molecules
    • Tomasz Wąsowicz
    • Antti Kivimaki
    • Robert Richter
    2020 Synchrotron Radiation in Natural Science

    The five-membered heterocyclic rings are incorporated into a wide variety of structures that play a vital role in many biochemical processes. In particular, the isoxazole molecule appears in many bioactive compounds due to its unique ring structure that consists of one oxygen atom and one nitrogen atom at adjacent positions. The unique atomic composition and bond arrangement of isoxazole imply its specific electronic properties that may be probed by diverse spectroscopic techniques, including those utilizing synchrotron radiation. In particular, the photoelectron-photoion coincidence (PEPICO) technique provides detailed information about the presence of specific bonds, the reactivity of these molecules, as well as their electronic structure and decomposition mechanisms.

  • Do Judges’ Delegations Affect Judicial Performance? A Transition Economy Evidence
    • Przemysław Banasik
    • Sylwia Morawska
    • Piotr Staszkiewicz
    • Bartosz Witkowski
    • Richard Staszkiewicz
    2020 JUSTICE SYSTEM JOURNAL

    The aim of this study is to discern whether, by delegating judges from the court to the Ministry of Justice, the Minister of Justice influences the results of courts in terms of adjudication. The study used a unique set of data for the Polish judicial system over a period of five years. The research results indicate that there are three reasons for delegating judges. Firstly, the delegation system serves to fill staff shortages among administrative staff at the Ministry of Justice. Secondly, the delegation system allows for inefficient judges to be moved. Thirdly, the system serves as an indirect control mechanism affecting the independence of courts. The results show that delegation has a positive short-term impact on judicial performance.

  • Dobór analizy strategicznej przedsięwzięć budowlanych w aspekcie zrównoważonego rozwoju
    • Maciej Niedostatkiewicz
    • Emilia Miszewska
    2020 Full text Przegląd Budowlany

    Celem artykułu jest wskazanie najbardziej właściwej z dostępnych metod analiz strategicznych dla realizacji przedsięwzięć budowlanych oraz wykorzystanie jej do oceny czy dane zamierzenie inwestycyjne pozostaje w zgodzie z zasadami rozwoju zrównoważonego.

  • Dobór geotekstyliów i wyrobów pokrewnych pełniących funkcję zbrojenia w budownictwie komunikacyjnym – wybrane problemy inżynierskie
    • Grzegorz Horodecki
    • Angelika Duszyńska
    2020

    Charakterystyka geotekstyliów i wyrobów pokrewnych stosowanych do zbrojenia gruntu w budownictwie komunikacyjnym. Identyfikacja wyrobów na budowie. Metodyka wyznaczania wytrzymałości długoterminowej zbrojenia geosyntetycznego.

  • DOBÓR PARAMETRÓW FILTRACJI W CEPSTRUM DLA POTRZEB POPRAWY JAKOŚCI ODBIERANEGO SYGNAŁU
    • Agnieszka Czapiewska
    • Andrzej Łuksza
    • Ryszard Studański
    • Andrzej Żak
    2020 Full text Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

    W referacie zaproponowano metodę eliminacji wpływu efektu wielodrogowości poprzez analizę i filtrację odbieranego sygnału w cepstrum. Analiza taka, pozwala na wykrycie istnienia repliki (echa) sygnału nadawanego oraz odfiltrowanie tej repliki, co poprawia jakość realizowanej transmisji sygnału. W referacie zaprezentowano wyniki badan symulacyjnych.

  • Does the Use of Cell Phones and Headphones at the Signalised Pedestrian Crossings Increase the Risk of Accident?
    • Joanna Wachnicka
    • Karol Kulesza
    2020 Full text Baltic Journal of Road and Bridge Engineering

    Reduction of the number of fatalities among pedestrians remains a topical issue in Poland. For many years, this percentage has remained at around 30% of all those who were killed on the road. At the same time, there is an increase in the use of electronic devices by pedestrians and cyclists that may affect their perception when crossing the road. This can lead to traffic accidents. In order to investigate the problem, field studies were carried out and their results are presented in the article. Pilot studies on pedestrian and cyclist behaviour were carried out at three pedestrian crossings with traffic lights in Gdansk. Attention was paid to whether pedestrians and cyclists use headphones when crossing the road, whether they are talking on the phone or writing SMS. The results of the research indicate that currently in Gdańsk about 10% of unprotected traffic users use a telephone and 5% use headphones at pedestrian crossings. Most of them are young people, 70–90% of all users. Women prefer using headphones more than men. Pedestrians exhibited dangerous behaviour involving entering the road at a red light regardless of the use of telephones and headphones. Therefore, as part of the studies described, it cannot be clearly stated whether the use of telephones and headphones increases the risk of being the victim of an accident. Due to the lack of separate statistics with accidents involving mobile phones and headsets, it was not possible to analyse statistical data in this respect. At the same time, research confirmed traffic disruptions at the crossings, caused by telephone users, as indicated in literature.

  • Dom podcieniowy na Żuławach
    • Marta Koperska-Kośmicka
    2020

    Pozycja obowiązkowa dla sympatyków Żuław. Zawiera ponad 500 kolorowych fotografii i rycin na temat najbardziej rozpoznawalnych zabytków Delty Wisły – domów podcieniowych. To obszerne vademecum prezentuje historię oraz współczesność dawnych obiektów, przedstawiając je na tle wielobarwnej historii regionu. Oprócz tych najbardziej popularnych, książka opisuje także mniej znane domy, które dotychczas nie znalazły się na stronach albumów czy przewodników.

  • Domain Reduction in Hybrid Technique for Electromagnetic Wave Scattering Problems
    • Małgorzata Warecka
    • Piotr Kowalczyk
    • Rafał Lech
    2020 Full text

    This paper proposes a combination of the field matching technique, finite element method and generalized impedance matrix, the main idea of which is to reduce the computational domain by surrounding a scatterer with the smallest convex shape and applying the field matching technique. This approach can be applied for arbitrary shaped scatterers and types of materials and allows for the reduction of the computational domain. In order to verify the validity of the method, several examples have been investigated and compared with other numerical techniques.

  • DOMY W STANDARDZIE PASYWNYM WYTYCZNE I DOŚWIADCZENIA PROJEKTOWO-REALIZACYJNE
    • Alicja Karaś
    2020

    Tematem niniejszej publikacji są budynki mieszkalne jednorodzinne w standardzie pasywnym zgodnym z założeniami Passivhaus Institut Darmstadt – twórców idei budownictwa pasywnego. W publikacji przedstawione zostały zasady projektowania budynków pasywnych, jakimi Autorka, będąca Certyfikowanym Europejskim Projektantem Budynków Pasywnych z ramienia Passivhaus Institut Darmstadt, kieruje się na co dzień w praktyce zawodowej. Jako ilustracje poszczególnych zagadnień i zasad posłużyły projekty domów pasywnych powstałych w MIDI Pracowni Architektonicznej. Twórcami wszystkich projektów są architekci: Alicja Karaś (autorka), Piotr Karaś, Maja Belecka oraz Maria Murawska. Książka adresowana jest przede wszystkim do studentów architektury, ale również pragnących pogłębić swoją wiedzę w zakresie projektowania budynków pasywnych architektów oraz inwestorów rozważających tego rodzaju inwestycję. Publikacja zawiera szereg praktycznych wskazówek dotyczących projektowania oraz wykonawstwa.

  • Down-Sampling of Large LiDAR Dataset in the Context of Off-Road Objects Extraction
    • Wioleta Błaszczak-bąk
    • Joanna Janicka
    • Czesław Suchocki
    • Andrea Masiero
    • Anna Sobieraj-Żłobińska
    2020 Full text Geosciences

    Nowadays, LiDAR (Light Detection and Ranging) is used in many fields, such as transportation. Thanks to the recent technological improvements, the current generation of LiDAR mapping instruments available on the market allows to acquire up to millions of three-dimensional (3D) points per second. On the one hand, such improvements allowed the development of LiDAR-based systems with increased productivity, enabling the quick acquisition of detailed 3D descriptions of the objects of interest. However, on the other hand, the extraction of the information of interest from such huge amount of acquired data can be quite challenging and time demanding. Motivated by such observation, this paper proposes the use of the Optimum Dataset method in order to ease and speed up the information extraction phase by significantly reducing the size of the acquired dataset while preserving (retain) the information of interest. This paper focuses on the data reduction of LiDAR datasets acquired on roads, with the goal of extraction the off-road objects. Mostly motivated by the need of mapping roads and quickly determining car position along a road, the development of efficient methods for the extraction of such kind of information is becoming a hot topic in the research community.

  • Draft genome sequence of antimicrobial producing Paenibacillus alvei strain MP1 reveals putative novel antimicrobials
    • Magdalena Pajor
    • Jonathan Sogin
    • Randy Worobo
    • Piotr Szweda
    2020 Full text BMC Research Notes

    A Paenibacillus strain isolated in previous research exhibited antimicrobial activity against relevant human pathogens including Staphylococcus aureus and Listeria monocytogenes. In this study, the genome of the aforementioned strain, designated as MP1, was shotgun sequenced. The draft genome of strain MP1 was subject to multiple genomic analyses to taxonomically characterize it and identify the genes potentially responsible for its antimicrobial activity.

  • Drill holes decrease cancellous bone strength: A comparative study of 33 paired osteoporotic human and 9 paired artificial bone samples
    • Marcin Ceynowa
    • Krzysztof Żerdzicki
    • Paweł Kłosowski
    • Rafał Pankowski
    • Marek Rocławski
    • Tomasz Mazurek
    2020 Full text PLOS ONE

    This study was designed to compare compressive strength of cancellous bone retrieved from the femoral head in a specimen with and without guide wire hole, with comparison to synthetic bone samples. Femoral heads retrieved from 33 patients who sustained femoral neck fractures and underwent hip arthroplasty were cut into cuboids leaving two matching samples from the same femoral head. Similar samples were prepared from synthetic femurs. One of the matching samples was chosen at random and was drilled with a guide wire for cancellous screws. The uniaxial compression tests of bone blocks were carried out using the Zwick-Roell Z020 strength testing machine. The mean loss of sample cross section area due to drilling was 24%. The force at failure in drilled specimens was significantly smaller by 18% in human (median: 26%) and by 25% in synthetic bone (median 27%). The strength of human specimens was almost 2 times greater, and their stiffness nearly 4 times greater than in synthetic samples. The study shows that the weakening of the bone after drilling is roughly proportional to the loss of sample cross section area. The percentage decrease in strength was similar in human and artificial bone, but human samples were stronger and stiffer. The comparison shows that forces measured in biomechanical studies on artificial bone cannot be directly attributed to humans, but the relative differences in mechanical properties of synthetic samples after some damage may be accurate and resemble that of human bones.

  • Droga S7 Koszwały – Kazimierzowo – geotechniczne aspekty inwestycji.
    • Grzegorz Horodecki
    2020

    W artykule przedstawiono ogólne informacje dotyczące geotechnicznych aspektów projektu i realizacji drogi S7 na odcinku Koszwały – Kazimierzowo, ze szczególnym uwzględnieniem rozwiązań z zastosowaniem technologii zamkniętego materaca odciążającego z kruszywa lekkiego – keramzytu geotechnicznego. Przedstawiono metody wzmocnienia podłoża przyjęte na etapie projektu oraz realizacji wraz z monitoringiem geotechnicznym.

  • Druk 3D części z tworzyw sztucznych na skalę przemysłową w technologii SLS
    • Dawid Zieliński
    2020 Full text Tworzywa Sztuczne w Przemyśle

    Firma EOS, wiodący i światowy dostawca technologii przemysłowego wykorzystania druku 3D dla materiałów metalicznych i polimerowych, zaprezentowała na targach formnext 2017 nowy system EOS P500, przeznaczony do addytywnego wytwarzania modeli. Drukarka 3D adresowana jest dla przedsiębiorstw chcących wytwarzać na skalę przemysłową części i elementy z tworzyw sztucznych o wysokiej jakości.

  • Druk 3D części z tworzyw sztucznych na skalę przemysłową w technologii SLS
    • Dawid Zieliński
    2020 Full text Materiały & Maszyny Technologiczne

    Firma EOS, wiodący i światowy dostawca technologii przemysłowego wykorzystania druku 3D dla materiałów metalicznych i polimerowych, zaprezentowała na targach formnext 2017 nowy system EOS P500, przeznaczony do addytywnego wytwarzania modeli. Drukarka 3D adresowana jest dla przedsiębiorstw chcących wytwarzać na skalę przemysłową części i elementy z tworzyw sztucznych o wysokiej jakości.

  • Dynamic analysis of temporary steel grandstand subjected to human-induced excitations due to jumping
    • Natalia Lasowicz
    • Robert Jankowski
    2020 Full text AIP Conference Proceedings

    Steel grandstands are structures that are frequently used during sport games and many other non-sporting events, such as festivals, music concerts, or even politicians rallies, with participation of a large number of attendees. Unfortunately, the presence of unexpected excessive dynamic loads due to unpredictable behaviour of spectators (e.g. synchronized harmonic jumping or swaying) may lead to serious structural damage or even total collapse of a structure, and such cases were observed in the past. Given that, steel grandstands should be designed so as to withstand the unexpected dynamic loads leading to damage and, therefore, ensure maximum safety for all participants. Building codes, however, apply different approaches. According to the Polish Standard, an additional horizontal load equal to 6% of the total vertical load acting on a grandstand has to be considered at the design stage. The British Standard, on the other hand, specifies a higher value of horizontal load, i.e. 10% of the total vertical load that should be taken into account. Therefore, the aim of the present paper is to conduct a dynamic numerical investigation focused on the response of a steel temporary grandstand subjected to human-induced vibrations due to jumping with two different values of horizontal load (6% and 10% of the total vertical load) as well as for two different bracing elements (typical tubular member and polymer damper). The results of the study clearly show that the response of a temporary steel scaffolding grandstand equipped with two different bracing elements taking into account two different approaches is substantially different.

  • Dynamic Charging of Electric Buses as a Way to Reduce Investment Risks of Urban Transport System Electrification
    • Mikołaj Bartłomiejczyk
    • Marcin Połom
    2020

    Night charging and fast charging are currently the two most common systems for charging electric buses. Despite the fact that numerous trial installations were started, neither of these two systems has obtained unqualified approval of the users. The alternative is to charge vehicles in motion - dynamic charging which combines the advantages of trolleybus transport and of electric buses. One of the advantages is the reduction of risks associated with the electrifica-tion of urban transport. The investment in the construction of the traction net-work allows you to reduce the costs associated with the purchase and replace-ment of traction batteries, as well as increase the flexibility of the transport system. The article presents the financial benefits resulting from the use of a dynamic charging system.

  • Dynamic Response of the Suspended on a Single Cable Footbridge
    • Mikołaj Miśkiewicz
    • Łukasz Pyrzowski
    • Krzysztof Wilde
    2020

    The article presents numerical simulations, dynamic in situ load tests and a structural health monitoring (SHM) system installed in a suspended on a single cable footbridge. Numerical simulations performed prior to construction indicated the possibility of structural dynamics problems, finally confirmed in the course of dynamic test loading. In the dynamic load course the bridge deck developed vibrations displaying accelerations up to 4.5 m/s2. Such footbridge behavior causes unacceptable discomfort to the users and risk of structural damage. The tests brought about the need for repair works and the use of a monitoring system to increase operational safety of the object.

  • Dynamic Tests and Technical Monitoring of a Novel Sandwich Footbridge
    • Jacek Chróścielewski
    • Mikołaj Miśkiewicz
    • Łukasz Pyrzowski
    • Magdalena Rucka
    • Bartosz Sobczyk
    • Krzysztof Wilde
    • Błażej Meronk
    2020

    A novel sandwich composite footbridge is described in this paper, for the first time after it has been put into operation over the Radunia River in the Pruszcz Gdański municipality. This paper presents results of dynamic tests and describes technical monitoring of the footbridge. The dynamic tests were conducted to estimate pedestrian comfort and were compared with the ones from numerical simulations made in the environment of Finite Element Method. A discussion of the obtained results is made then. The characteristics and capabilities of the network of sensors spread over the bridge to monitor its long-term behavior are described.

  • Dziedzictwo 150 lat rozwoju techniki wodociągowej na terenie Gdańska i Sopotu
    • Michał Klugmann
    2020

    Publikacja prezentuje historię nowoczesnych (czyli powstałych na fali rewolucji przemysłowej) wodociągów Gdańska i Sopotu. Wzmiankowane są najważniejsze zabytki techniki, związane z rozwojem systemu od II połowy XIX wieku. Na ich przykładzie poruszana jest szersza problematyka ochrony takich obiektów w polskich realiach. Opisany został zabytkowy zasób, w zakresie obiektów nieruchomych i dokumentacji, stan zachowania tego zasobu, działania dotychczas podjęte dla jego ochrony i elementy trwale utracone.

  • Early prediction of macrocrack location in concrete and other granular composite materials
    • A. Tordesillas
    • S. Kahagalage
    • C. Ras
    • Michał Nitka
    • Andrzej Tejchman-Konarzewski
    2020 Full text Scientific Reports

    Heterogeniczne kruche kompozyty, takie jak beton, ceramika i skały składają się z ziaren połączonych wiązaniami. Pytanie, czy ścieżka pęknięcia, która prowadzi do zniszczenia może być przewidziania na podstawie znanych cech mikrostrukturalnych, a mianowicie łączności wiązań, rozmiaru, energii pękania, wytrzymałości pozostają otwarte. Istnieje wiele kryteriów pęknięć. Najczęściej używane są oparte na postulowanym ekstremum naprężenia i/lub energii. Ponieważ siła i energia mają wspólne ścieżki przekazu, ich wąskie gardło przepływu może być prekursorskim mechanizmem zniszczenia, które pogodzi te kryteria optymalności w jednej ujednoliconej strukturze. Badamy to w ramach teorii przepływu sieci, używając dane mikrostrukturalne z trójwymiarowych modeli elementów dyskretnych betonu podczas rozciągania jednoosiowego. Znajdujemy wąskie gardło siły i energii na tej samej ścieżce, które zapewnia wczesną i dokładną prognozę ostatecznej ścieżki makropęknięcia w betonie.

  • ECOLOGY OR ECONOMICS? THE ASPECT DETERMINING THE USE OF DISPLACEMENT PILES FOR THE FOUNDATIONS OF BRIDGE STRUCTURES
    • Paweł Więcławski
    • Kazimierz Gwizdała
    2020 Full text

    W ostatnich latach rzadko wykonuje się pale wiercone o bardzo dużych średnicach ze względu na: wymagany sprzęt, transport wydobytego urobku gruntowego, duże ilości stali zbrojeniowej. Konstrukcje inżynierskie na autostradzie A-1, na drodze ekspresowej S-7 i Obwodnicy Południowej Gdańska posadowiono na palach prefabrykowanych. Fundamenty największych mostów na autostradzie A-1 zbudowano na palach Vibro i Franki. W artykule zwrócono uwagę na pale w pełni przemieszczeniowe, charakteryzujące się dużą nośnością uzyskiwaną w krótkim czasie od wykonania i prostą technologią, które są stosowane w fundamentach obiektów drogowych. Spośród wszystkich, obecnie wykonywanych rodzajów pali, tę technologię można nazwać ekologiczną i ekonomiczną. Te aspekty mogą zmienić zakres zastosowania pali przemieszczeniowych w najbliższej przyszłości.

  • Ecotoxicological equilibria of triclosan inMicrotox, XenoScreen YES/YAS, Caco2, HEPG2 and liposomal systems are affected by the occurrence of other pharmaceutical and personal care emerging contaminants
    • Miquel Oliver
    • Błażej Kudłak
    • Monika Wieczerzak
    • Salette Reis
    • Sofia Lima
    • Marcela Segundo
    • Manuel Miro
    2020 Full text SCIENCE OF THE TOTAL ENVIRONMENT

    Contaminants of emerging concernmay be considered as any chemicals or factorswhose unintended continuous release and persistence in the environmentmay lead to any observable undesirable response of living beings. Still not much is known on reciprocal toxicological impact of given chemicals when present in binary or more complex mixtures. In thiswork, an attemptwas thus undertaken to study the impact of butylparaben,methylparaben and diclofenac on toxicological behavior and properties of triclosan (at varying concentration levels)with respect to Microtox, XenoScreen YES/YAS, Caco-2, HEPG2, and liposomal systems.

  • ECU calibration for gaseous dual fuel supply system in compression ignition engines
    • Denys Stepanenko
    • Zbigniew Kneba
    2020 Full text Combustion Engines

    The dual fuel (DF) combustion mode is proven solution that allows to improve or get at the same level engine performance and reduce toxic compounds in exhaust gases which is confirmed by researchers and end-users. DF combustion mode uses two fuels gaseous fuel as a primary energy source and a pilot quantity of diesel fuel as ignition source. However, in order, to fully take advantage of the potential of the dual fuel mode, DF system must be proper calibrated. Despite the existence of commercial control systems for dual fuel engines on the market, the literature on the important parameters for the engine's operation introduced during calibration is scarce. This article briefly describes a concept of working algorithm and calibration strategy of a dual fuel electronic control unit (ECU) The purpose of calibration is to achieve the greatest possible use of an alternative gaseous fuel without causing accelerated engine wear.

  • Editorial for the special issue on advances in forward and inverse surrogate modeling for high-frequency design
    • Sławomir Kozieł
    • Anna Pietrenko-Dąbrowska
    2020 INTERNATIONAL JOURNAL OF NUMERICAL MODELLING-ELECTRONIC NETWORKS DEVICES AND FIELDS

    The design of modern‐day high‐frequency devices and circuits, including microwave/RF, antenna and photonic components, historically has relied on full‐wave electromagnetic (EM) simulation tools. Initially used for design verification, EM simulations are nowadays used in the design process itself, for example, for finding optimum values of geometry and/or material parameters of the structures of interest. In a growing number of cases, EM‐driven design closure is mandatory because alternative ways of evaluating the circuit performance (such as through equivalent network modeling) are grossly inaccurate and unable to account for cross‐coupling effects (eg, in densely arranged layouts of compact circuits or antenna arrays), or various environmental components that affect the circuit performance (eg, connectors or housing for antenna structures). Despite being imperative, simulation‐based design poses significant challenges, mostly due to the high computational cost of accurate, high‐fidelity analysis. Repetitive simulations entailed by conventional optimization routines and even more by uncertainty quantification procedures (eg, Monte Carlo analysis) or tolerance‐aware design tasks may generate the costs that are unmanageable or at least impractical. The availability of massive computational resources does not always translate into design speedup due to the need to account for interactions between devices and their surroundings as well as multiphysics (eg, EM‐thermal) effects.

  • EduAkcja. Historia pewnego czasopisma
    • Agnieszka Landowska
    • Maria Wilkin
    2020

    Rozdział przedstawia przebieg inicjatywy powołania czasopisma poświęconego zdalnemu nauczaniu o nazwie EduAkcja. Magazyn edukacji elektronicznej

  • E-dyplomy: uwarunkowania administracyjne i funkcjonalne ich wprowadzenia na polskich uczelniach
    • Wioletta Braun
    • Katarzyna Górak-Sosnowska
    2020

    Pandemia COVID-19 wymusiła na polskim systemie szkolnictwa wyższego szereg zmian, z których główne dotyczą zmian w zakresie organizacji pracy, cyfryzacji procesów obsługi toku studiów. Przepisy prawa stanowią już o e-teczce, mamy rozporządzenia dotyczące jej prowadzenia, niemniej niewiele uczelni, o ile w ogóle, prowadzi na chwilę obecną akta osobowe studentów w postaci elektronicznej. Jednym z elementów składowych e-teczki jest dyplom ukończenia studiów. Publikacja traktuje o obecnym systemie prawnym dotyczącym dyplomów oraz e-dyplomów. Wskazuje na konieczność wprowadzenia dodatkowych zapisów prawnych, które umożliwiłyby na wdrożenie tego rozwiązania. W artykule dokonano również przeglądu istniejących rozwiązań stosowanych w innych krajach i ewentualnych potencjalnych istniejących możliwościach cyfrowego odwzorowania dyplomu. Wprowadzenie e-dyplomów, bądź do ich całkowitego wdrożenia cyfrowych odwzorowań tych dokumentów, jest kwestią czasu. W artykule wskazano na potencjalne ścieżki procedowania tego rozwiązania.

  • E-Estonia as a role model? Some general considerations and applicability in France
    • Aleksandro Cepilovs
    • David Duenas Cid
    2020

    Estonia has recently been widely recognised – in the policy circles, academia, as well as the media space – as one of the more advanced nation states when it comes to digital government (and governance) transformation (e.g. Margetts and Naumann, 2017; Heller, 2017). Ever greater attention Estonia attracted with the two most recent digital government initiatives, namely the e-Residency and the virtual data embassy, both first of their kind in the world. Estonia thus placed itself among such leaders in digital government as Singapore and Denmark, despite the fact that it is both significantly smaller as well as relatively poorer in terms of GDP per capita1. This high level of development of digital government seems even more surprising considering the fact that Estonia has re-gained its independence less than 30 years ago.

  • Effect of Aromatic System Expansion on Crystal Structures of 1,2,5-Thia- and 1,2,5-Selenadiazoles and Their Quaternary Salts: Synthesis, Structure, and Spectroscopic Properties
    • Jan Alfuth
    • Beata Zadykowicz
    • Artur Sikorski
    • Tadeusz Połoński
    • Katarzyna Eichstaedt
    • Teresa Olszewska
    2020 Full text Materials

    Rational manipulation of secondary bonding interactions is a crucial factor in the construction of new chalcogenadiazole-based materials. This article reports detailed experimental studies on phenanthro[9,10-c][1,2,5]chalcogenadiazolium and 2,1,3-benzochalcogenadiazolium salts and their precursors. The compounds were synthesized, characterized employing NMR and UV-Vis spectroscopy. TD-DFT calculations were also performed. The influence of the size of the aromatic system on the molecular motifs formed by the compounds in the solid state has been studied by means of single-crystal X-ray diffraction. In case of the salts, the nature of an anion was also taken into consideration. The results show that cyclic [E···N]2 supramolecular synthon connects neighboring molecules of phenanthro[9,10-c][1,2,5]chalcogenadiazoles, with a relatively large aromatic system, in dimers regardless of the chalcogen atom in the molecule. Both N-methyl-2,1,3-benzothiadiazolium and N-methylphenanthro[9,10-c][1,2,5]chalcogenadiazolium cations have a strong affinity for triflate and iodide anions, therefore the formation of S···N or Se···N secondary bonding interactions is observed only in two out of the eight quaternary salts. Less coordinating anions must be used to enable the building blocks studied to form cyclic [E···N]2 synthons. Moreover, for two of the triflate salts, which are isostructural, a new supramolecular motif has been observed.

  • Effect of Axial Porosities on Flexomagnetic Response of In-Plane Compressed Piezomagnetic Nanobeams
    • Mohammad Malikan
    • Victor Eremeev
    • Krzysztof Kamil Żur
    2020 Full text Symmetry-Basel

    We investigated the stability of an axially loaded Euler–Bernoulli porous nanobeam considering the flexomagnetic material properties. The flexomagneticity relates to the magnetization with strain gradients. Here we assume both piezomagnetic and flexomagnetic phenomena are coupled simultaneously with elastic relations in an inverse magnetization. Similar to flexoelectricity, the flexomagneticity is a size-dependent property. Therefore, its effect is more pronounced at small scales. We merge the stability equation with a nonlocal model of the strain gradient elasticity. The Navier sinusoidal transverse deflection is employed to attain the critical buckling load. Furthermore, different types of axial symmetric and asymmetric porosity distributions are studied. It was revealed that regardless of the high magnetic field, one can realize the flexomagnetic effect at a small scale. We demonstrate as well that for the larger thicknesses a difference between responses of piezomagnetic and piezo-flexomagnetic nanobeams would not be significant.

  • Effect of band gap on power conversion efficiency of single-junction semiconductor photovoltaic cells under white light phosphor-based LED illumination
    • Grażyna Jarosz
    • Rafał Marczyński
    • Ryszard Signerski
    2020 Full text MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING

    On the basis of the detailed balance principle, curves of efficiency limit of single-junction photovoltaic cells at warm and cool white light phosphor-based LED bulbs with luminous efficacy exceeding 100 lm/W have been simulated. The effect of energy band gap and illuminance on the efficiencies at warm and cool light is discussed. The simulations carried out show that maximum power conversion efficiency at 1000 lx reaches 52.0% for cool light and 53.6% for warm one, while the optimal energy band gap is 1.80 eV and 1.88 eV, respectively. The simulated limits are also referenced to experimental data presented in literature to show that there is still a lot of room for improving indoor photovoltaic cells.

  • Effect of Base-Connection Strength and Ductility on the Seismic Performance of Steel Moment-Resisting Frames
    • Tomasz Falborski
    • Pablo Torres-Rodas
    • Farzin Zareian
    • Amit Kanvinde
    2020 JOURNAL OF STRUCTURAL ENGINEERING-ASCE

    Column-base connections in steel moment-resisting frames (SMFs) in seismic regions are commonly designed to develop the capacity of adjoining column with an intent to develop a plastic hinge in the column member, rather than in the connection (i.e., a strong-base design). Recent research has shown base connections to possess high ductility, indicating that this practice may be not only expensive but also unnecessary. This suggests that concentrating inelastic rotations in the base connection may result in acceptable performance. Motivated by this finding, the performance of steel moment resisting frames with a weak-base design is investigated to examine the relationships between base-connection strength, deformation capacity, and structural performance. The main scientific basis of this study is nonlinear static pushover and nonlinear time history simulations on SMFs designed for high seismicity. These simulations interrogate parameters including frame height (4-, 8-, 12-, and 20-story), base-connection strength, base flexibility, and base rotation capacity, resulting in a total of 160 parametric combinations. The performance of each of these is assessed to estimate the probabilities of failure or collapse corresponding to a 2/50 (2% probability of exceedance in 50 years) intensity of shaking. The key finding is that for all frames, acceptable performance (i.e., comparable to current practice with capacity-designed bases) may be obtained by designing the base connections for overstrength seismic loads (i.e., based on the Ω factor) rather than based on column capacity; this has the potential to offer significant cost savings. For a low-rise (i.e., four-story) frame, acceptable performance is achieved even without significant rotational demands in the base connection. For the other frames, a baseconnection rotation capacity of approximately 0.05 rad is necessary to achieve acceptable performance. Implications of these findings for prospective design practices, as well as future research, are outlined, and limitations are discussed.

  • Effect of bio-based components on the chemical structure, thermal stability and mechanical properties of green thermoplastic polyurethane elastomers
    • Paulina Parcheta
    • Ewa Głowińska
    • Janusz Datta
    2020 Full text EUROPEAN POLYMER JOURNAL

    It seems to be obvious that conditions changes during polyols synthesis have impact on the polyols properties. Even the chemical formula is the same or similar, physicochemical properties and also molecular weight of polyols might be different and are significant in term of future polyurethanes properties and processing. In this work, fully bio-based poly(propylene succinate)s synthesized at different temperature conditions were used as a polyol in thermoplastic polyurethane elastomers (TPU) synthesis. Novel bio-based TPUs were synthesized with the use of mentioned bio-based linear polyester polyols, poly(propylene succinate)s and also 4,4-diphenylmethane diisocyanate (MDI) and a chain extender 1,4-butanediol (BDO) or 1,3-propanediol (PDO), both with the natural origin. Influence of synthesized bio-based polyols on thermoplastic polyurethane elastomers characteristic was determined based on investigation of chemical structure, thermal, thermomechanical, mechanical and physical properties of synthesized bio-based TPU. Fourier transform infrared spectroscopy (FTIR) and proton nuclear magnetic resonance (1H NMR) were applied to the chemical formula determination. Thermogravimetry was supportive in thermal analysis, dynamic mechanical analysis (DMA), tensile test and hardness were used to determine thermomechanical behavior and mechanical properties at static and dynamic condition. The density of the obtained materials was also measured. It was established that using obtained fully bio-based polyester polyols the thermoplastic polyurethane elastomers can be synthesis without catalyst usage. Based on the results demonstrated greater influence of type of chain extender on bio-based TPU properties than condition of bio-based polyester synthesis. Each sample was characterized by glass temperature (Tg) ca. 0-5°C and similar thermal stability ca. 320°C. The tensile strength of prepared bio-based TPUs reach even 30 MPa with an elongation at break ca. 550%.

  • Effect of bitumen characteristics obtained according to EN and Superpave specifications on asphalt mixture performance in low-temperature laboratory tests
    • Dawid Ryś
    • Mariusz Jaczewski
    • Marek Pszczoła
    • Piotr Jaskuła
    • Wojciech Bańkowski
    2020 Full text CONSTRUCTION AND BUILDING MATERIALS

    The paper aims to identify those characteristics of bitumen which have the greatest impact on asphalt mixture low-temperature performance. It was observed that stiffness and m-value of bitumen from BBR test were moderately related to stiffness and m-value of asphalt mixture obtained from 3 PB test. Simultaneously those rheological properties significantly impact on cryogenic stresses induced during TSRST test. The multiple regression model was developed and it implied that mixture failure temperature depends both on rheological properties, brittle fracture and content of bitumen, what means that only comprehensive assessment of bitumen properties enables reasonable assessment of its low-temperature performance.

  • Effect of chemical structure on complexation efficiency of aromatic drugs with cyclodextrins: The example of dibenzazepine derivatives
    • Koleta Hemine
    • Anna Skwierawska
    • Cyprian Kleist
    • Michał Olewniczak
    • Katarzyna Szwarc-Karabyka
    • Dariusz Wyrzykowski
    • Anna Mieszkowska
    • Jarosław Chojnacki
    • Jacek Czub
    • Łukasz Nierzwicki
    2020 CARBOHYDRATE POLYMERS

    It is widely believed that the hydrophobic effect governs the binding of guest molecules to cyclodextrins (CDs). However, it is also known that high hydrophobicity of guest molecules does not always translate to the formation of stable inclusion complexes with CDs. Indeed, a plethora of other factors can play a role in the efficiency of guest–CD interactions, rendering structure-based prediction of the complexation efficiency with CDs a non trivial task. In this combined experimental and computational study, we examine the major structural factors governing complexation efficiency of polycyclic aromatic drug-like compounds with natural CDs, using as an example iminostilbene and its N-substituted derivatives. We find that purely hydrophobic IS derivatives show negligible complexation efficiency with CDs and only IS with hydrophilic substituents form stable inclusion complexes in water. We show that the balance between the guest solubility and its affinity to CDs is critical for the effective formation of inclusion complexes. Finally, our results demonstrate that guest–host hydrogen bonds facilitate the formation of crystalline inclusion complexes with CDs.

  • Effect of Different Bromine Sources on the Dual Cation Mixed Halide Perovskite Solar Cells
    • Damian Głowienka
    • Francesco Giacomo Di
    • Mehrdad Najafi
    • Ilker Dogan
    • Alfredo Mameli
    • Fallon J. M. Colberts
    • Jędrzej Szmytkowski
    • Yulia Galagan
    2020 Full text ACS Applied Energy Materials

    Recent research has shown that perovskite solar cells with a mixed dual A-cation have much better structural stability without loss of efficiency than single cation devices. Mixed cation perovskites create a lot of questions about the salts being used for the formation of the best-quality layer. Here, we have investigated three sources of bromide in the perovskite absorption layer, using lead bromide (PbBr2), formamidinium bromide (FABr), and cesium bromide (CsBr). The experimental results have shown better performance for FABr and CsBr sources of bromide in comparison to the regularly used PbBr2. This effect has been explained with the complex species present in the not-annealed perovskite films which changes the defect states during the crystallization of the absorber layer. It has been found with numerical simulations that the observed phenomenon directly impacts the rates of the trap-assisted recombination. The results of this study are one more step forward in understanding the physics behind the crystallization process which is crucial in further improvement of the perovskite solar cells.

  • Effect of electrode waterproof coating on quality of underwater wet welded joints
    • Jacek Tomków
    • Dariusz Fydrych
    • Kamil Wilk
    2020 Full text Materials

    In this paper, the effects of different hydrophobic coatings on the surface of covered electrodes on the quality of wet welded carbon steel joints were discussed. Commonly available hydrophobic substances used in industrial applications were selected for the research. The aim of using waterproof coatings was to check the possibility to decreasing the susceptibility of highstrength low-alloy S460N steel to cold cracking. During experiments diffusible hydrogen content in deposited metal determination by mercury method, metallographic macro- and microscopic testing and hardness measurements were performed. Investigations showed that waterproof coatings laid on covered electrodes can improve the quality of wet welded joints, by decreasing the Vickers HV10 hardness in heat-affected zone and decreasing the diffusible hydrogen content in deposited metal, which minimalize possibility of cold cracking.

  • Effect of Ethanol Extracts of Propolis (EEPs) against Staphylococcal Biofilm—Microscopic Studies
    • Katarzyna Grecka
    • Zirui Ray Xiong
    • Hanyu Chen
    • Karolina Pełka
    • Randy Worobo
    • Piotr Szweda
    2020 Full text Pathogens

    Staphylococci growing in the form of biofilm exhibit high resistance to a plethora of antibiotics. The aim of the study was to assess the influence of ethanolic extract of propolis (EEPs) on S. epidermidis ATCC 35984 biofilm using fluorescent microscopy. Propidium iodide (PI) and SYTO 9 were used for differentiation of live and dead cells, and calcofluor white was used to stain the extracellular matrix, the self-produced extracellular polymeric substances (EPS). The outcomes of the research confirm the promising potential of EEPs for eradication of staphylococcal biofilm. However, its activity cannot be classified as fully satisfactory, either in terms of the effectiveness of elimination of bacterial cells or disturbing the EPS structure. A two or even four times higher concentration of EEPs compared to MIC (Minimum Inhibitory Concentration) against planktonic cells (128 µg/mL) was necessary for effective (estimated for 90%) elimination of living cells from the biofilm structure. Unfortunately, even at that concentration of EEPs, the extracellular matrix was only partially disturbed and effectively protected the residual population of living cells of S. epidermidis ATCC 35984. In our opinion, a combination of EEPs with agents disrupting components of EPS, e.g., proteases, lysines, or enzymes degrading extracellular DNA or PIA (polysaccharide intercellular adhesin).

  • Effect of Flow Normalization in Micro-Pin-Finned Heat Sink: Numerical Study
    • Gurjeet Singh
    • Kumar Ritunesh
    • Dariusz Mikielewicz
    2020 Full text JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER

    The micro-pin-fin heat sink (MPFHS) is widely employed for the heat transfer enhancement of microchannel heat sinks. In the current paper, the effect of flow normalization on the thermohydraulic performance of micro-pin-finned heat sinks is studied numerically. Two geometries of MPFHSs, the conventional design micro-pin-fin heat sink (CD-MPFHS) with a uniform-width micro pin fin and the proposed design micro-pin-fin heat sink (PD-MPFHS) with a nonuniform-width micro pin fin, are studied. Flow distribution analysis in the primary and secondary channels of MPFHSs is carried out. More flow resistance offered by wider central micro pin fins diverts more flow toward side channels; as a result of which, better flow distribution in primary channels and higher flow across secondary channels are noticed for the PD-MPFHS as compared to the CD-MPFHS. As a result of that, maximum and average base temperatures are reduced by 4.6 and 2.2K as compared to the CD-MPFHS. The Nusselt number increased by 10.1%, and a better thermohydraulic performance index has been offered by the PD-MPFHS for the entire studied Reynolds number range.

  • Effect of interconnect coating procedure on solid oxide fuel cell performance
    • Hamid Abdoli
    • Sebastian Molin
    • Hamidreza Farnoush
    2020 Full text MATERIALS LETTERS

    Chromium (Cr) species vaporizing from chromia-forming alloy interconnects is known as a source of degradation in solid oxide fuel cell (SOFC) stacks called “cathode poisoning”. (Mn,Co)3O4 spinel coatings offer good protection against Cr evaporation during operation. In this study, Crofer 22 APU steel interconnects were electrophoretically deposited in different mediums to obtain high packing of green coating layer. The optimized sample was then sintered in air-atmosphere or dual-atmospheres (reducing-oxidizing). Anode-supported cells were exposed from cathode side to bare or coated interconnects for 100 h at 800 °C. The electrochemical performances of aged cells were compared at 800 °C. Due to higher density coating obtained by dual-atmospheres sintering process, the exposed cell showed performance similar to non-poisoned cell (0.95–0.98 W/cm2). The cell exposed to air-atmosphere sintered coating interconnect showed lower output power (0.75 W/cm2) due to coating lower density. The cell exposed to uncoated interconnect exhibited considerable degradation and the lowest power (0.66 W/cm2).

  • Effect of pine impregnation and feed speed on sound level and cutting power in wood sawing
    • Roksana Licow
    • Daniel Chuchała
    • Mariusz Deja
    • Kazimierz Orłowski
    • Piotr Taube
    2020 Full text JOURNAL OF CLEANER PRODUCTION

    The sound levels along with the cutting power registered during the sawing process of the impregnated and non-impregnated pine wood at two feed speeds are shown and compared in this paper. Statistically significant differences in the acoustic signals occurred at the lower feed rate. The differences became smaller with an increase in the feed speed. In contrast to the sound signal, the differences in the cutting power were statistically significant only for the higher feed rate. In addition, the average electric power of the main drive allowed for the identification of knots during the sawing process. Obtained results indicated that monitoring based on the analysis of sound signals can be used as a supplementary source of information related to the wood cutting processes. This kind of independently used monitoring could be recommended for long-running and stabilized sawing processes, due to high noise level generated during the transition states when the tool enters and exits the material - transition states.