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Publikacje z roku 2020

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  • Bezzałogowy kołowy pojazd elektryczny do automatycznego wychodzenia z poślizgów
    • Juliusz Ciecierski
    • Piotr Drewek
    • Adam Misiak
    • Robert Piotrowski
    2020 Pełny tekst Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej

    Pojazdy bezzałogowe znajdują zastosowanie w wielu dziedzinach współczesnego świata. Pojazdy autonomiczne wraz z algorytmami wspomagającymi kierowanie pojazdami skupiają uwagę wielu zespołów inżynierskich. Jednym z ważniejszych aspektów bezpieczeństwa na drogach jest wspomaganie zapobiegania i wychodzenia z poślizgów w dynamicznym środowisku. Artykuł przedstawia projekt oraz wykonanie bezzałogowego pojazdu kołowego zdolnego do automatycznego wychodzenia z poślizgów. Następnie pojazd oprogramowano oraz opracowano aplikację mobilną na urządzenia z systemem Android. Na koniec wykonano badania testowe opracowanego rozwiązania.

  • Będziesz lubić to, co lubisz
    • Jarosław Wawer
    2020 Elektronika dla wszystkich

    Felieton popularno-naukowy dotyczący powstawania baniek informacyjnych/baniek filtrujących.

  • Biblioteka PG uzyskała dofinansowanie z Ministerstwa Nauki i Szkolnictwa Wyższego
    • Kamila Kokot-Kanikuła
    2020 Pismo PG

    „Konserwacja, digitalizacja i udostępnienie 15 wol. zbiorów historycznych z kolekcji Biblioteki PG” to tytuł kolejnego projektu zakwalifikowanego do finansowania w ramach programu ogłoszonego przez Ministerstwo Nauki i Szkolnictwa Wyższego – Społeczna Odpowiedzialność Nauki. Biblioteka otrzyma wsparcie w wysokości 121 tys. zł, przy czym wartość całego przedsięwzięcia wyniesie 136,5 tys. zł.

  • Bidirectional Fragment to Fragment Links in Wikipedia
    • Szymon Olewniczak
    • Tomasz Boiński
    • Julian Szymański
    2020 Pełny tekst

    The paper presents a WikiLinks system that extends the Wikipedia linkage model with bidirectional links between fragments of the articles and overlapping links’ anchors. The proposed model adopts some ideas from the research conducted in a field of nonlinear, computer-aided writing, often called a hypertext. WikiLinks may be considered as a web augmentation tool but it presents a new approach to the problem that addresses the specific nature of Wikipedia. The system, rather than working on the HTML level, works on the wiki code level and augments the Wikipedia content on the parsing phase. WikiLinks is shipped with a new kind of wiki code parser – a parallel markup parser, that allows applying externally-stored links to the content in an elegant way. The system also addresses the problem of bidirectional links' anchors adjustments on the articles' changes, provides a special link evolution procedure and handles the link’s visibility problem. According to our knowledge, this is the first attempt that brings bidirectional links directly to Wikipedia. One of the possible applications of bidirectional fragment-fragment links are associative links. An associative link is a connection between two document fragments that are related to each other in some sense. The new link type extends the current Wikipedia linkage model, dominated by definitional links and provides us an additional tool for content organization, that might be useful for still-growing Wikipedia’s article base. The associative links are from their nature more subjective that definitional ones. In order to test the relevance of this new linkage model, we conducted experiment that checked if the associative links created by one person are understandable to others. The obtained results are very promising and show the usefulness of a new linkage model for Wikipedia.

  • BIG PROBLEMS WITH BIG DATA
    • Krzysztof Goczyła
    2020 Pełny tekst TASK Quarterly

    The article presents an overview of the most important issues related to the phenomenon called big data. The characteristics of big data concerning the data itself and the data sources are presented. Then, the big data life cycle concept is formulated. The next sections focus on two big data technologies: MapReduce for big data processing and NoSQL databases for big data storage.

  • Bioavailability of Tannins and Other Oligomeric Polyphenols: a Still to Be Studied Phenomenon
    • Naira Sahakyan
    • Agnieszka Bartoszek-Pączkowska
    • Jacob Claus
    • Margarit Petrosyan
    • Armen Trchounian
    2020 Current Pharmacology Reports

    Purpose of Review Polyphenols are a group of plant secondary metabolites characterized with the presence ofmultiples of phenol structural units. Tannins are plant originated phenolic substances, which play an important role in plant defense system as well as have found applications in medicine, industry, and other fields of human activity. Despite these, the mechanisms of bioavailability of these substances are poorly studied and even there are very few amounts of sources gathering recent studies concerning this issue. So the main purpose of this review is to focus on the known peculiarities and possible ways of the bioavailability of these oligomeric substances. Recent Findings Due to the ability of tannins to bind proteins and other macromolecules, they are responsible for astringency or bitterness of red wines and also for the anti-nutritional effects, which can be reduced by the action of tannase. In nutriceutical industry, tannins are used as natural preservers and antioxidants. They have also a wide range of medicinal application as antihemorrhagic and hemostatic, anti-malarial and antitumor, antimicrobial, antioxidant, anti-tyrosinase, anthelmintic, antiviral, and anti-inflammatory activities among others. It is suggested that absorption of tannins is correlatedwith their polymerization degree and the activity of these components depends on their absorption in the gut, metabolism and, therefore, the bioavailability. Summary Despite numerous promising applications, there are still plenty of open spaces to fully understand determinants of the bioavailability of tannins and other oligomeric polyphenols pivotal for the expression of their biological activity.

  • Bio-Based Polyurethane Composites and Hybrid Composites Containing a New Type of Bio-Polyol and Addition of Natural and Synthetic Fibers
    • Adam Olszewski
    • Paulina Kosmela
    • Aleksandra Mielewczyk-Gryń
    • Łukasz Piszczyk
    2020 Pełny tekst Materials

    This article describes how new bio-based polyol during the liquefaction process can be obtained. Selected polyol was tested in the production of polyurethane resins. Moreover, this research describes the process of manufacturing polyurethane materials and the impact of two different types of fibers—synthetic and natural (glass and sisal fibers)—on the properties of composites. The best properties were achieved at a reaction temperature of 150 °C and a time of 6 h. The hydroxyl number of bio-based polyol was 475 mg KOH/g. Composites were obtained by hot pressing for 15 minutes at 100 °C and under a pressure of 10 MPa. Conducted researches show the improvement of flexural strength, impact strength, hardness, an increase of storage modulus of obtained materials, and an increase of glass transition temperature of hard segments with an increasing amount of fibers. SEM analysis determined better adhesion of sisal fiber to the matrix and presence of cracks, holes, and voids inside the structure of composites.

  • Bioelectronic tongue: Current status and perspectives
    • Wasilewski Tomasz
    • Wojciech Kamysz
    • Jacek Gębicki
    2020 BIOSENSORS & BIOELECTRONICS

    In the course of evolution, nature has endowed humans with systems for the recognition of a wide range of tastes with a sensitivity and selectivity which are indispensable for the evaluation of edibility and flavour attributes. Inspiration by a biological sense of taste has become a basis for the design of instruments, operation principles and parameters enabling to mimic the unique properties of their biological precursors. In response to the demand for fast, sensitive and selective techniques of flavouring analysis, devices belonging to the group of bioelectronic tongues (B-ETs) have been designed. They combine achievements of chemometric analysis employed for many years in electronic tongues (ETs), with unique properties of bio-inspired materials, such as natural taste receptors (TRs) regarding receptor/ligand affinity. Investigations of the efficiency of the prototype devices create new application possibilities and suggest successful implementation in real applications. With advances in the field of biotechnology, microfluidics and nanotechnologies, many exciting developments have been made in the design of B-ETs in the last five years or so. The presented characteristics of the recent design solutions, application possibilities, critical evaluation of potentialities and limitations as well as the outline of further development prospects related to B-ETs should contribute to the systematisation and expansion of our knowledge.

  • Biogenne aminy
    • Edyta Malinowska-Pańczyk
    2020

    W rozdziale omówiono zagadnienia związane z powstawaniem biogennych amin w surowcach i produktach żywnościowych oraz ich wpływ na zdrowie konsumentów.

  • Biological and mechanical properties of bone cement with nanoarticles - in vitro and in vivo research
    • Beata Świeczko-Żurek
    • Marcin Wekwejt
    • Anita Kajzer
    • Wojciech Kajzer
    • Karolina Siwicka
    • Antonio Ramos
    • Michel Mesnard
    • Jean-marc Olive
    2020 Journal of Mechanical Engineering and Biomechanics

    Despite antibiotic preventive treatment both before and after implant implementation, the risks of infection are real. These infections develop at the implant surface a few months after inserting them into the body. To prevent the development of bacteria and reduce the risk of infection, implants coated with nanoparticles are used. The Mechanical Department of the Technical University of Gdansk carries out research into using bone cement and metal nanoparticles as an alternative to antibiotics [1-3]. Until now, bone cement has been used without a supplement or with one or two drugs. These new experiments included pure bone cement with nanometals, without drugs. The titanium specimens were covered with nanometal coatings. Specimens were inserted into a rat`s thigh for six weeks. The implant was then removed from the body and examined by scanning electron microscope. The results were positive: there was a good adhesion of osteoblasts on the implant surface and there were no traces of infection. Biological research was also carried out. Boneless samples were placed into a bacterial liquid generated by the researcher which contained the five most common bacteria in the human body (Patent no. P409082). Mechanical and corrosion research was carried out at the same time. This confirmed that the modification of bone cement using nanometals has no significant negative effect on the setting time of bone cement, or on the hardness and value of contact angle. In addition, the bone cement coating (with or without nanometals) improved corrosion resistance.

  • Biomateriały we współczesnej medycynie
    • Karolina Czarnecka
    • Mateusz Siwiak
    • Justyna Kucińska-Lipka
    • Jacek Zieliński
    • Helena Janik
    • Michał Pikuła
    2020

    Biomedycyna oznacza eksperymentalne biologiczne i medyczne nauki zintegrowane w całość, w tym nauki chemiczne o związkach wielkocząstoczkowych.

  • Bioterroryzm we współczesnym świecie
    • Marcin Żurek
    • Beata Świeczko-Żurek
    2020

    W definicji wojny biologicznej ważne są słowa dotyczące zastosowania osiągnięć nauki, ponieważ do świadomego i celowego korzystania z broni biologicznej wymagane jest zrozumienie choroby. Gwałtowny rozwój nauk biologicznych i towarzyszące mu liczne odkrycia doprowadziły do większego zainteresowania się bronią biologiczną. Doskonalono techniki hodowli i izolacji kultur mikrobiologicznych. Artykuł opisuje czym jest bioterroryzm i jakie są rodzaje broni biologicznej.

  • Bismuth-Doped Nano Zerovalent Iron: A Novel Catalyst for Chloramphenicol Degradation and Hydrogen Production
    • Murtaza Sayed
    • Aamir Khan
    • Sajid Rauf
    • Noor S. Shah
    • Faiza Rehman
    • Abdullah A. Al-Kahtani
    • Javed Khan
    • Jibran Iqbal
    • Grzegorz Boczkaj
    • Ikhtiar Gul
    • Maleeha Bushra
    2020 Pełny tekst ACS Omega

    In this study, we showed that doping bismuth (Bi) at the surface of Fe0 (Bi/Fe0, bimetallic iron system)—synthesized by a simple borohydride reduction method—can considerably accelerate the reductive degradation of chloramphenicol (CHP). At a reaction time of 12 min, 62, 68, 74, 95, and 82% degradation of CHP was achieved with Fe0, Bi/Fe0-1 [1% (w/w) of Bi], Bi/Fe0-3 [3% (w/w) of Bi], Bi/Fe0-5 [5% (w/w) of Bi], and Bi/Fe0-8 [8% (w/w) of Bi], respectively. Further improvements in the degradation efficiency of CHP were observed by combining the peroxymonosulfate (HSO5–) with Bi/Fe0-5 (i.e., 81% by Bi/Fe0-5 and 98% by the Bi/Fe0-5/HSO5– system at 8 min of treatment). Interestingly, both Fe0 and Bi/Fe0-5 showed effective H2 production under dark conditions that reached 544 and 712 μM by Fe0 and Bi/Fe0-5, respectively, in 70 mL of aqueous solution containing 0.07 g (i.e., at 1 g L–1 concentration) of the catalyst at ambient temperature.

  • Blood Pressure - Pulse Transit Time Relationships: Comparative Studies
    • Artur Poliński
    • Adam Bujnowski
    • Tomasz Kocejko
    • Jerzy Wtorek
    2020

    A non-invasive and continuous blood pressure estimation could allow a better diagnosis and an earlier detection of various diseases. It could be performed using a photoplethysmography. However, it requires that a relation between blood pressure and pulse transit time is known. Eleven theoretical formulas were used in obtaining the simulated and noise free synthetic data. Then, they were utilized in validation of three, commonly used, formulas for blood pressure estimation. Finally, the best one was indicated

  • Blowing Kinetics, Pressure Resistance, Thermal Stability, and Relaxation of the Amorphous Phase of the PET Container in the SBM Process with Hot and Cold Mold. Part I: Research Methodology and Results
    • Paweł Wawrzyniak
    • Waldemar Karaszewski
    2020 Pełny tekst Polymers

    The technology of filling drinks without preservatives (such as fresh juices, iced tea drinks, vitaminized drinks) is carried out using hot filling. Mainly due to the production costs and lower carbon footprint, polyethylene terephthalate bottles, commonly called PET, are increasingly used in this technology. In this paper, the main aim is to describe the statistical analysis methodology of the influence of the temperature of the blow mold in the SBM process and the method of hot filling on the macroscopic and microscopic bottle properties. The macroscopic bottle properties were defined by the thickness profile, pressure resistance, thermal stability, and the coefficients of blowing kinetics. Moreover, the influence of the SBM (stretch blow moulding) process on the microscopic PET material properties (in the bottle) relative to the microscopic preform properties was analyzed. The microscopic properties were defined by the degree of crystallite, density, and relaxation of the amorphous phase of the PET material. For this purpose, response surface experiments were performed for the two analyzed factors (independent variables), i.e., the temperature of the blow mold and the method of hot filling. The sample size was investigated to determine the minimum number of repetitions (number of bottles in the measurement series) required to achieve acceptable measurement uncertainty. The research conducted shows that despite fulfilling the postulate of acceptable measurement uncertainty, in terms of the power of ANOVA (analysis of variance) in DOE (design of experiment) the accepted number of bottles in the measurement series is too small. The tests of the bottle material density, material crystallite, and relaxation of amorphous phase relative to the preform material density, material crystallite, and relaxation of amorphous phase show that the microcavity effects occur during the deformation of the PET material, and that these are associated with the orientation of the microstructure. The blow kinetics study shows that there is a gradient of flow of the bottle material over the thickness of the bottle wall during blowing, and it has been deduced that the air temperature between the blow mold and the wall of the blown bottle has an impact on the kinetics of blowing the bottle.

  • Blowing Kinetics, Pressure Resistance, Thermal Stability, and Relaxation of the Amorphous Phase of the PET Container in the SBM Process with Hot and Cold Mold. Part II: Statistical Analysis and Interpretation of Tests
    • Paweł Wawrzyniak
    • Waldemar Karaszewski
    2020 Pełny tekst Polymers

    The technology of filling drinks without preservatives (such as fresh juices, iced tea drinks, and vitaminized drinks) is carried out using hot filling. Mainly due to the production costs and lower carbon footprint, polyethylene terephthalate (PET) bottles are increasingly used in this technology. In this paper, the main aim is to describe and interpret the results of statistical analysis of the influence of the temperature of the blow mold in the SBM (stretch blow molding) process and the method of hot filling on the macroscopic and microscopic bottle properties. The macroscopic bottle properties were defined by the thickness profile, pressure resistance, thermal stability, and the coefficients of blowing kinetics. In addition, the influence of the SBM process on the microscopic PET material properties (in the bottle) relative to the microscopic preform properties was analyzed. The microscopic properties were defined by the degree of crystallite, density, and relaxation of the amorphous phase of the PET material. For this purpose, response surface experiments were performed for the two analyzed factors, i.e. the temperature of the blow mold and the method of hot filling. The sample size was investigated to determine the minimum number of repetitions (number of bottles in the measurement series) required to achieve acceptable measurement uncertainty. The research conducted shows that, despite fulfilling the postulate of acceptable measurement uncertainty, in terms of the power of ANOVA (analysis of variance) in DOE (design of experiment), the accepted number of bottles in the measurement series is too small. The tests of the bottle material density, material crystallite, and relaxation of amorphous phase relative to the preform material density, material crystallite, and relaxation of amorphous phase show that microcavity effects occur during the deformation of the PET material, and that these are associated with the orientation of the microstructure. The blow kinetics study shows that there is a gradient of flow of the bottle material over the thickness of the bottle wall during blowing, and it has been deduced that the air temperature between the blow mold and the wall of the blown bottle has an impact on the kinetics of blowing the bottle.

  • Blurred quantum Darwinism across quantum reference frames
    • Thao P. Le
    • Piotr Mironowicz
    • Paweł Horodecki
    2020 Pełny tekst PHYSICAL REVIEW A

    Quantum Darwinism describes objectivity of quantum systems via their correlations with their environment--information that hypothetical observers can recover by measuring the environments. However, observations are done with respect to a frame of reference. Here, we take the formalism of [Giacomini, Castro-Ruiz, & Brukner. Nat Commun 10, 494 (2019)], and consider the repercussions on objectivity when changing quantum reference frames. We find that objectivity depends on non-degenerative relative separations, conditional state localisation, and environment macro-fractions. There is different objective information in different reference frames due to the interchangeability of entanglement and coherence, and of statistical mixing and classical correlations. As such, objectivity is subjective across quantum reference frames.

  • Bounded solutions of odd nonautonomous ODE
    • Zdzisław Dzedzej
    2020 Pełny tekst TOPOLOGY AND ITS APPLICATIONS

    Borsuk-Ulam type argument is used in order to prove exstence of nontrivial bounded solutions to some nonautonomous differential euations which are odd with respect to the spatial variable. A Poincare compactification trick is also applied.

  • BPL-PLC Voice Communication System for the Oil and Mining Industry
    • Grzegorz Debita
    • Przemysław Falkowski-Gilski
    • Marcin Habrych
    • Grzegorz Wiśniewski
    • Bogdan Miedziński
    • Przemysław Jedlikowski
    • Agnieszka Waniewska
    • Jan Wandzio
    • Bartosz Polnik
    2020 Pełny tekst ENERGIES

    Application of a high-efficiency voice communication systems based on broadband over power line-power line communication (BPL-PLC) technology in medium voltage networks, including hazardous areas (like the oil and mining industry), as a redundant mean of wired communication (apart from traditional fiber optics and electrical wires) can be beneficial. Due to the possibility of utilizing existing electrical infrastructure, it can significantly reduce deployment costs. Additionally, it can be applied under difficult conditions, thanks to battery-powered devices. During an emergency situation (e.g., after coal dust explosion), the medium voltage cables are resistant to mechanical damage, providing a potentially life-saving communication link between the supervisor, rescue team, paramedics, and the trapped personnel. The assessment of such a system requires a comprehensive and accurate examination, including a number of factors. Therefore, various models were tested, considering: different transmission paths and types of coupling (inductive and capacitive), as well as various lengths of transmitted data packets. Next, a subjective quality evaluation study was carried out, considering speech signals from a number of languages (English, German, and Polish). Based on the obtained results, including both simulations and measurements, appropriate practical conclusions were formulated. Results confirmed the applicability of BPL-PLC technology as an efficient voice communication system for the oil and mining industry.

  • Bridge of Knowledge: an Internet platform for R2R and R2B transfer of knowledge and promotion of cooperation
    • Henryk Krawczyk
    • Paweł Lubomski
    2020 Pełny tekst TASK Quarterly

    Currently, the European Commission puts emphasis on supporting collaboration between universities and business. There are many possible ways to create a strong relationship between both these parties. Positive results of such cooperation lead to increased competitiveness of the global market and, in consequence, bring significant growth of innovation. The cooperation between research-to-research (R2R) and research-to-business (R2B) is analysed. The paper shows how the IT technology can be used to support and stimulate it. In our University we proposed a two-step strategy. Firstly, we tried to improve collaboration among scientists in order to develop R2R activities. Secondly, we focused on R2B projects that stimulate promising scientists to take part in various innovative activities carried out in cooperation with the industry representatives. Based on some well-known good practices a special Internet platform was designed and implemented to support such a strategy. Its name is the “Bridge of Knowledge”. The platform architecture, its functionality and some other aspects of the development process are described. The platform was developed and introduced at the Gdańsk University of Technology. It has been available online for nearly 2 years now and it has been attracting increasing numbers of new visitors and returning users. Several use cases of cooperation between R2R and R2B were analysed and described with the use of advanced analytic tools and on the basis of the organisation’s resources. The idea of the Bridge of Knowledge platform is to gather and share resources not only from one university. The architecture of the platform focuses on a wide and easy interoperability. Other universities can share their resources without any additional cost.