Publications Repository - Gdańsk University of Technology

Page settings

polski
Publications Repository
Gdańsk University of Technology

Show publications from the year

Recent items

  • Modelling study of flow boiling heat transfer of perspective fluids for refrigeration technology
    • Michał Pysz
    • Dariusz Mikielewicz
    2020

    There is a gap of knowledge on flow boiling at high saturation temperatures and higher values of reduced pressure. Thus far, the in-house developed semi-empirical model for flow boiling and flow condensation showed a satisfactory accuracy for calculations for various refrigeration fluids for a wide scope of reduced pressures. This study presents results of calculations of heat transfer coefficient of perspective refrigeration fluids, such as R152a, R32, R245fa, propane and isobutane. Computations were carried out to validate the generalized theoretical in-house model. Study was performed for both conventional and minichannel tubes for a full range of vapour quality. The vast part of the database consists of experiments carried out for low saturation temperature, however in case of R245fa the collected data includes medium and high saturation temperatures. The theoretical results shows a good agreement with experimental data especially for low saturation temperature cases. Most unfavorable outcomes were gained for R245fa. Inconsistency of these results show that more attention should be given to the influence of higher values of reduced pressure on heat transfer predictions.

  • Modelowanie bezpiecznika rozłącznikowego w układach formowania impulsów wielkiej mocy
    • Daniel Kowalak
    • Mikołaj Nowak
    • Mirosław Wołoszyn
    • Kazimierz Jakubiuk
    2020 Full text Przegląd Elektrotechniczny

    Problem modelowania bezpieczników o dużej dynamice wyłączania prądu jest zagadnieniem szeroko opisywanym w literaturze. Układy takie mogą być wykorzystane w szczególności do formowania impulsów wysokiego napięcia o wartościach rzędu setek kV, charakteryzujących się czasem trwania rzędu ułamka μs. W niniejszej pracy przedstawiono empiryczny model bezpiecznika wielotopikowego, rozszerzony w oparciu o wyniki badań eksperymentalnych.

  • Modelowanie losowych imperfekcji geometrycznych przestrzennych konstrukcji metalowych
    • Jarosław Górski
    • Tomasz Mikulski
    • Magdalena Oziębło
    • Przemysław Sorn
    • Karol Winkelmann
    2020 Full text Inżynieria i Budownictwo

    Imperfekcje geometryczne zbiorników, silosów i powłok siatkowych mogą znaczą-co wpłynąć na ich nośność, a więc powinny być one uwzględniane w obliczeniach komputerowych i w procesie projektowania. Wykazano, że przy podstawowych obcią-żeniach, działających na tego typu konstrukcje, tj. podciśnieniu oraz naporu wiatru i śniegu (w przypadku powłok siatkowych), wykazują wyraźne różnice w porównaniu z analogicznymi wynikami dla tych konstrukcji o idealnej geometrii. Wprowadzenie me-tod probabilistycznych do projektowania oraz szacowanie niezawodności konstrukcji staje się coraz bardziej dostępne i powinno być uwzględniane w projektowaniu.

  • Modelowanie matematyczne transportu lodu w rejonie projektowanego Stopnia Wodnego Siarzewo
    • Tomasz Kolerski
    • Krzystof Wrzosek
    • Przemysław Sobiesak
    • Krzystof Polak
    2020 Gospodarka Wodna

    Przedstawiono wpływ planowanego stopnia Siarzewo na Wiśle na dynamikę lodu w obszarze powyżej i poniżej stopnia. Do tego celu zaimplementowano model matematyczny i przeprowadzono symulacje numeryczne dla różnych scenariuszy. Obliczenia służyły do wyznaczeniu trasy spływu lodu przez zbiornik i poniżej zbiornika oraz sił z jakimi lód będzie oddziaływał na brzegi i dno rzeki oraz projektowane na zbiorniku wyspy. Badaniami objęto odcinek Wisły pomiędzy istniejącym stopniem wodnym Włocławek (km 674,850) a km 715.

  • Models of Brushless Synchronous Generator for Studying Autonomous Electrical Power System
    • Filip Kutt
    2020

    This is a PhD dissertation. The work presented in this monograph was carried out at the Department of Power Electronics and Electrical Machines, Faculty of Electrical and Control Engineering at the Gdansk University of Technology. Developed during the research models of brushless synchronous generator ware verified using FEM based simulations and measurements conducted on the prototype generator. The main focus of the research was toward a brushless synchronous generator in variable frequency modern more electric aircraft power systems. The generator prototype was developed and its performance was analyzed with the focus on the higher rotational velocity of the prototype components and the generated power quality. For this FEM based and circuit models of the generator ware developed and the machine performance was measured and simulated. The proposed circuit model allowed for the inclusion of nonsinusoidal spatial distribution of the magnetic flux along the air gap which in turn allowed for simulation-based power quality analysis.

  • Modernity and postmodernity in architectural education
    • Piotr Czyż
    2020 Full text World Transactions on Engineering and Technology Education

    The purpose of this article is to present a philosophical education strategy for architecture and interior architecture faculties. The approach is the result of trial and error in lectures and debates with students of philosophical courses in these fields. The presented article is not a result of empirical research, but rather a report on the problems encountered and proposals for their solution. The experience gained from conducting philosophical didactics in architecture faculties allowed the author to note that the main reason for the low interest in philosophical problems is the distance between classically understood philosophy or the history of philosophy and professional issues. Bridging that gap can result in increasing the graduates’ ability to solve problems and strengthen their social competencies.

  • Modernized cathodic protection system for legs of the production rig – Evaluation during ten years of service
    • Krzysztof Żakowski
    • Piotr Igliński
    • Juliusz Orlikowski
    • Kazimierz Darowicki
    • Kinga Domańska
    2020 Full text OCEAN ENGINEERING

    The modernization of cathodic protection system of the Baltic Beta platform legs is described. It was that the sacrificial anodes cone-shaped groups were to be placed on the seabed at a depth of 80 m. The measurements results of cathodic protection effectiveness during its ten-years operation are presented. The effectiveness was assessed based on the potential value along the entire length of the legs from the sea surface to the seabed. The gained experience indicates that use of sacrificial anode systems mounted on the seabed can be an effective form of cathodic protection of offshore platforms legs. It is basically the only means of anticorrosion protection in case of a platform not able to leave its location for renovation works in a shipyard.

  • Modification of Ground Tire Rubber—Promising Approach for Development of Green Composites
    • Łukasz Zedler
    • Marta Przybysz-Romatowska
    • Józef Haponiuk
    • Shifeng Wang
    • Krzysztof Formela
    2020 Full text Journal of Composites Science

    Ground tire rubber (GTR) was mechano-chemically modified using a road bitumen 100/150 and two types of organic peroxides: di-(2-tert-butyl-peroxyisopropyl)-benzene (BIB) and dicumyl peroxide (DCP). The impact of used additives on reactive sintering efficiency and physico-mechanical properties of modified GTR was investigated using oscillating disc rheometer measurements, followed by tensile tests and swelling behavior studies. It was found that the application of bitumen and both used peroxides (DCP/BIB) improves processing and reactive sintering efficiency better than untreated GTR. However, the results indicate that BIB is more prone to blooming on the surface of modified GTR, thus limiting (especially at higher content) its application as a modifier and promotor of GTR reactive sintering.

  • Modifications at the C(5) position of pyrimidine nucleosides
    • Kozak Witold
    • Sebastian Demkowicz
    • Mateusz Daśko
    • Janusz Rachoń
    • Janusz Rak
    2020 Full text RUSSIAN CHEMICAL REVIEWS

    This review summarizes the state of knowledge on the chemical methods of C(5)-modifications of uridine and cytidine derivatives and may serve as a useful tool for synthetic chemists to choose an appropriate reaction protocol. The synthesis of 5-substituted uracil derivatives is gaining an increasing interest because of their possible applications in medicine and pharmacy. Modifications at the C(5) position of pyrimidine nucleosides can enhance their biostability, bioavailability or(and) biological activity. Among the C(5)-modified nucleosides, 5-halopyrimidines exhibit anticancer, antiviral, radio- and photosensitizing properties. Besides 5-halo-substituted derivatives, there are other examples of nucleosides with confirmed biological activity containing a C7C bond at the C(5) position in the pyrimidine ring. In recent decades, scientists have achieved great progress in the field of cross-coupling reactions. Among them, nickel-catalyzed processes provide a broad spectrum of synthetic methods that are based on less toxic and cheaper starting materials. This review summarizes the synthetic approaches based on the coupling or halogenation reactions, which enable 5-substituted pyrimidine nucleosides to be obtained. Moreover, the importance of the systems considered for medicine and pharmacy is briefly discussed.

  • Modified Manganese Phosphate Conversion Coating on Low-Carbon Steel
    • Jakub Duszczyk
    • Katarzyna Siuzdak
    • Tomasz Klimczuk
    • Judyta Strychalska-Nowak
    • Adriana Zaleska-Medynska
    2020 Full text Materials

    Conversion coatings are one of the primary types of galvanic coatings used to protect steel structures against corrosion. They are created through chemical reactions between the metal surface and the environment of the phosphating. This paper investigates the impact that the addition of new metal cations to the phosphating reaction environment has on the quality of the final coating. So far, standard phosphate coatings have contained only one primary element, such as zinc in the case of zinc coatings, or two elements, such as manganese and iron in the case of manganese coatings. The structural properties have been determined using a scanning electron microscope (SEM), X-ray diraction (XRD), and electrochemical tests. New manganese coatings were produced through a reaction between the modified phosphating bath and the metal (Ba, Zn, Cd, Mo, Cu, Ce, Sr, and Ca). This change was noticeable in the structure of the produced manganese phosphate crystallites. A destructive eect of molybdenum and chromium was demonstrated. Microscopic analysis, XRD analysis and electrochemical tests suggest that the addition of new metal cations to the phosphating bath aects the corrosion resistance of the modified coating.

  • Moduł platformy SyMEC odpowiedzialny za współpracę serwera MEC z sieciami komórkowymi i bezprzewodowymi sieciami dostępowymi WLAN
    • Michał Hoeft
    • Krzysztof Gierłowski
    • Józef Woźniak
    • Wojciech Gumiński
    • Krzysztof Nowicki
    • Dariusz Więcek
    • Igor Michalski
    • Dariusz Wypiór
    2020 Full text Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

    Zaprezentowano moduł współpracy z sieciami dostępowymi, będący istotnym elementem serwera MEC (Multi-access Edge Computing), budowanego w ramach projektu SyMEC i umożliwiającego uruchamianie elementów aplikacyjnych na brzegu sieci. Przedstawiono różnice w wymaganiach dotyczących sposobu realizacji tego komponentu w przypadku sieci dostępowych standaryzowanych przez 3GPP oraz sieci WLAN. Zaproponowana została architektura umożliwiająca spełnienie powyższych wymagań i ujednolicenie dostępnej funkcjonalności, pomimo zróżnicowanych możliwości oferowanych przez wykorzystywane sieci dostępowe.

  • Molecular Dynamics simulations of thermal conductivity of penta-graphene
    • Isyna Izzal Muna
    • Szymon Winczewski
    2020 Full text TASK Quarterly

    The thermal conductivity of penta-graphene (PG), a new two dimensional carbon allotrope and its dependence on temperature, strain, and direction are studied in this paper. The thermal conductivity of PG is investigated using a non-equilibrium molecular dynamics simulation (NEMD) with the Two Region Method by applying the optimized Tersoff interatomic potential. Our study shows that the thermal conductivity of PG (determined for the [100] direction) at the room temperature of 300 K is about 18.7 W/(m K), which is much lower than the thermal conductivity of graphene. As the temperature increases, the thermal conductivity of PG is decreasing because, unlike graphene, PG has lower phonon group velocities and few collective phonon excitations. The obtained dependence of the thermal conductivity on the temperature can be described as ∼ −0.32. For the [110] direction the thermal conductivity at the room temperature of 300 K is very similar: about 17.8 W/(m K). In this case, the temperature dependence follows the ∼ −0.3 relation. Our investigations reveal that the thermal conductivity of PG is isotropic, meaning that heat transport behavior is independent of the heat flow direction. Our results indicate that the thermal conductivity of PG depends in an interesting way on the applied strain: nonmonotonic up-and-down behavior is observed. The thermal conductivity increases between strains from 0% up to 12.5%, and it decreases above a strain of 12.5%. Our investigation highlights the fascinating thermal transport properties of penta-graphene. The ultra-low thermal conductivity, the decreasing thermal conductivity with the increasing temperature, and the ultra-high mechanical strength of PG show that PG possesses a great potential in thermoelectric and nanomechanics applications. We hope that these findings, made by means of simulations, will become a bridge to inspire and encourage the experimental works, especially in the synthesis of PG.

  • Molywood: streamlining the design and rendering of molecular movies
    • Miłosz Wieczór
    • Adam Hospital
    • Genis Bayarri
    • Jacek Czub
    • Modesto Orozco
    2020 Full text BIOINFORMATICS

    Motivation High-quality dynamic visuals are needed at all levels of science communication, from the conference hall to the classroom. As scientific journals embrace new article formats, many key concepts – particularly in structural biology – are also more easily conveyed as videos than still frames. Notwithstanding, the design and rendering of a complex molecular movie remain an arduous task. Here, we introduce Molywood, a robust and intuitive tool that builds on the capabilities of VMD to automate all stages of movie rendering. Results Molywood is a Python-based script that uses an integrated workflow to give maximal flexibility in movie design. It implements the basic concepts of actions, layers, grids and concurrency and requires no programming experience to run. Availability The script is freely available on GitLab (gitlab.com/KomBioMol/molywood) and PyPI (through pip), and features an extended documentation, tutorial and gallery hosted on mmb.irbbarcelona.org/molywood.

  • Moments of Hermite-Gaussian functionals
    • Marek Beśka
    • Mateusz Gałka
    2020 Full text Applicationes Mathematicae

    Moments of finite products of Hermite-Gaussian functionals are expressed by covariances of Gaussian sequence.

  • Monetary values estimates of solvents emissions
    • Marek Tobiszewski
    • Marta Bystrzanowska
    2020 Full text GREEN CHEMISTRY

    The impact values for environmental emissions of 52 solvents are estimated and expressed in monetary units. The impact values of solvents present in the air are calculated on the basis of 13 impact indicators and for solvents present in water on additional 2 impact indicators. These impact values are weighted with the results obtained with multi-compartment distribution model, allowing to calculate the fraction of solvent emitted to the environment present in each of the compartments. The results show that the impact values of solvents emissions are in range 0.7 – 1179.06 $ L-1, with mean value 20.69 $ L-1, expressed in USD2019. These impacts are considerably lower for short chain aliphatic hydrocarbons, alcohols, ethers, aldehydes, ketones and esters. High impact values are obtained for long chain aliphatic hydrocarbons, aromatic hydrocarbons, terpenes and extremely high value for carbon tetrachloride. Monetary values calculated to assess the solvents emissions impact have the advantage that they are quantitative, and easily applicable.

  • Monitoring the BTEX Volatiles during 3D Printing with Acrylonitrile Butadiene Styrene (ABS) Using Electronic Nose and Proton Transfer Reaction Mass Spectrometry
    • Wojciech Wojnowski
    • Kaja Kalinowska
    • Jacek Gębicki
    • Bożena Zabiegała
    2020 Full text SENSORS

    We describe a concept study in which the changes of concentration of benzene, toluene, ethylbenzene, and xylene (BTEX) compounds and styrene within a 3D printer enclosure during printing with different acrylonitrile butadiene styrene (ABS) filaments were monitored in real-time using a proton transfer reaction mass spectrometer and an electronic nose. The quantitative data on the concentration of the BTEX compounds, in particular the concentration of carcinogenic benzene, were then used as reference values for assessing the applicability of an array of low-cost electrochemical sensors in monitoring the exposure of the users of consumer-grade fused deposition modelling 3D printers to potentially harmful volatiles. Using multivariate statistical analysis and machine learning, it was possible to determine whether a set threshold limit value for the concentration of BTEX was exceeded with a 0.96 classification accuracy and within a timeframe of 5 min based on the responses of the chemical sensors.

  • Mono- and bimetallic (Pt/Cu) titanium(IV) oxide photocatalysts. Physicochemical and photocatalytic data of magnetic nanocomposites’ shell
    • Zuzanna Bielan
    • Kowalska Ewa
    • Szymon Dudziak
    • Kunlei Wang
    • Bunsho Ohtani
    • Anna Zielińska-Jurek
    2020 Full text Data in Brief

    Surface modification of titania with noble and semi-noble metals resulted in significant enhancement of photocatalytic activity. Presented data, showing the photocatalytic properties of TiO2-M (where M is Pt and/or Cu) photocatalysts were further used as Fe3O4@SiO2/TiO2-M magnetic nanocomposites shells in "Mono- and bimetallic (Pt/Cu) titanium(IV) oxide core-shell photocatalysts with Vis light activity and magnetic separability" [1]. Platinum and copper were photodeposited on four different titania matrices (commercial and self-obtained ones). The prepared photocatalysts were characterized by X-ray diffraction (XRD) analysis, specific surface area measurements using the Brunauer-Emmet-Teller (BET) isotherm, diffuse reflectance spectroscopy (DR-UV/Vis) analysis as well as scanning transmission electron microscopy (STEM) analysis. Photocatalytic properties were investigated in three different reactions: H2 generation, acetic acid oxidation to CO2, and phenol degradation.

  • Morze możliwości
    • Karol Moszyk
    • Łukasz Rogatka
    2020 Kaizen

    Z Karolem Moszykiem, Kierownikiem ds. Rozwoju Operacyjnego/ Lean Six Sigma Black Belt, DCT Gdańsk SA i prelegentem pierwszego Gdańskiego Manager Clubu - o ciągłbym doskonaleniu w głębokowodnym terminalu kontenerowym - rozmawiał Łukasz Rogatka

  • Mountain pass solutions to Euler-Lagrange equations with general anisotropic operator
    • Magdalena Chmara
    • Jakub Maksymiuk
    2020 Full text JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS

    Using the Mountain Pass Theorem we show that the problem \begin{equation*} \begin{cases} \frac{d}{dt}\Lcal_v(t,u(t),\dot u(t))=\Lcal_x(t,u(t),\dot u(t))\quad \text{ for a.e. }t\in[a,b]\\ u(a)=u(b)=0 \end{cases} \end{equation*} has a solution in anisotropic Orlicz-Sobolev space. We consider Lagrangian $\Lcal=F(t,x,v)+V(t,x)+\langle f(t), x\rangle$ with growth conditions determined by anisotropic G-function and some geometric conditions of Ambrosetti-Rabinowitz type.

  • Możliwości wykorzystania spektroskopii fotoelektronów w analizie jakości środowiska wodnego
    • Jacek Ryl
    • Tadeusz Ossowski
    • Maria Elektorowicz
    • Elżbieta Niemirycz
    2020 Technologia Wody

    Spektroskopia fotoelektronów w zakresie promieniowania X, (XPS, z ang. X-ray photoelectron spectroscopy) jest nowoczesną metodą analityczną wykorzystywaną w wielu wiodących ośrodkach naukowych na świecie. Jest ona stale ulepszana, jak też poznawane są nowe obszary jej zastosowania. W niniejszym artykule przedstawione zostały możliwości wykorzystania metody XPS w ramach obszarów badawczych powiązanych z gospodarką wodną, takich jak analiza jakościowa i ilościowa wód oraz osadów dennych, ocena stanu technicznego obiektów i instalacji wodnych oraz badania technik membranowych i bioreaktorów wykorzystywanych w ochronie środowiska wodnego.

  • MP3vec: A Reusable Machine-Constructed Feature Representation for Protein Sequences
    • Sanket Rajan Gupte
    • Dharm Skandh Jain
    • Ashwin Srinivasan
    • Raviprasad Aduri
    2020

    —Machine Learning (ML) methods have been used with varying degrees of success on protein prediction tasks, with two inherent limitations. First, prediction performance often depends upon the features extracted from the proteins. Second, experimental data may be insufficient to construct reliable ML models. Here we introduce MP3vec, a transferable representation for protein sequences that is designed to be used specifically for sequence-to-sequence learning tasks. We use transfer learning to generate the MP3vecs by training a deep neural network on the source problem of protein secondary structure prediction, and then extracting representations learned by the trained network for use in related downstream prediction tasks. ML methods using MP3vecs perform as well as the state-of-the-art (or better) on the target problems, while being orders of magnitude faster in terms of training time. We suggest that MP3vec can act as a strong baseline for comparative work on the use of ML in protein-prediction tasks; and for future extensions with domainspecific features.

  • Multi-agent graph searching and exploration algorithms
    • Dorota Osula
    2020 Full text

    A team of mobile entities, which we refer to as agents or searchers interchangeably, starting from homebases needs to complete a given task in a graph.The goal is to build a strategy, which allows agents to accomplish their task. We analyze strategies for their effectiveness (e.g., the number of used agents, the total number of performed moves by the agents or the completion time).Currently, the fields of on-line (i.e., agents have no a priori knowledge about the graph topology) multi-agent graph searching and exploration are rapidly expanding. Recent studies have presented new approaches and models to better describe real-life problems like clearing danger areas by a group of robots or constructing a map of an unknown terrain. A centralized searching and exploration in the off-line setting (i.e., when the topology of a graph is known in advance) are well studied, due to their wide applications in robotic and network fields, and many profound results have been established. In this thesis we are focusing on the issues of the monotone connected decontamination problem, the on-line collaborative exploration and the partial exploration of digraphs. Firstly, we provide two comprehensive surveys on the topics of graph searching and exploration. Then in the four subsequent chapters, we present the following results: - We give a distributed algorithm for the searchers that allows them to compute a connected and monotone strategy that guarantees searching any unknown partial grid of order n with the use of O(\sqrt{n}) searchers. Moreover, we give a lower bound of Ω(\sqrt{n}/log n) in terms of achievable competitive ratio of any distributed algorithm. - Checking if the connected pathwidth of any graph is at most some fixed integer k can be done in polynomial time. - Let the cost of a strategy be the total distance traversed by agents coupled with the price of invoking them. We construct two cost-optimal off-line algorithms for rings and trees, respectively. For unknown rings, we give a 2-competitive algorithm. We prove a lower bound of competitive ratio of 3/2 (for rings) and 2 (for trees) for any on-line algorithm. - The problem of establishing if there exists a subgraph, which connects a chosen vertices and can be explored by a given number of agents is NP-hard and FPT.

  • Multicopy Suppressor Analysis of Strains Lacking Cytoplasmic Peptidyl-Prolyl cis/trans Isomerases Identifies Three New PPIase Activities in Escherichia coli That Includes the DksA Transcription Factor
    • Paweł Wojtkiewicz
    • Daria Biernacka
    • Patrycja Gorzelak
    • Anna Stupak
    • Gracjana Klein-Raina
    • Satish Raina
    2020 Full text INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES

    Consistent with a role in catalyzing rate-limiting step of protein folding, removal of genes encoding cytoplasmic protein folding catalysts belonging to the family of peptidyl-prolyl cis/trans isomerases (PPIs) in Escherichia coli confers conditional lethality. To address the molecular basis of the essentiality of PPIs, a multicopy suppressor approach revealed that overexpression of genes encoding chaperones (DnaK/J and GroL/S), transcriptional factors (DksA and SrrA), replication proteins Hda/DiaA, asparatokinase MetL, Cmk and acid resistance regulator (AriR) overcome some defects of Δ6ppi strains. Interestingly, viability of Δ6ppi bacteria requires the presence of transcriptional factors DksA, SrrA, Cmk or Hda. DksA, MetL and Cmk are for the first time shown to exhibit PPIase activity in chymotrypsin-coupled and RNase T1 refolding assays and their overexpression also restores growth of a Δ(dnaK/J/tig) strain, revealing their mechanism of suppression. Mutagenesis of DksA identified that D74, F82 and L84 amino acid residues are critical for its PPIase activity and their replacement abrogated multicopy suppression ability. Mutational studies revealed that DksA-mediated suppression of either Δ6ppi or ΔdnaK/J is abolished if GroL/S and RpoE are limiting, or in the absence of either major porin regulatory sensory kinase EnvZ or RNase H, transporter TatC or LepA GTPase or Pi-signaling regulator PhoU.

  • MULTI-CRITERIA COMPARATIVE ANALYSIS OF THE USE OF SUBTRACTIVE AND ADDITIVE TECHNOLOGIES IN THE MANUFACTURING OF OFFSHORE MACHINERY COMPONENTS
    • Mariusz Deja
    • Mieczysław Siemiątkowski
    • Dawid Zieliński
    2020 Full text Polish Maritime Research

    The dynamic development of additive manufacturing technologies, especially over the last few years, has increased the range of possible industrial applications of 3D printed elements. This is a consequence of the distinct advantages of additive techniques, which include the possibility of improving the mechanical strength of products and shortening lead times. Offshore industry is one of these promising areas for the application of additive manufacturing. This paper presents a decision support method for the manufacturing of offshore equipment components, and compares a standard subtractive method with an additive manufacturing approach. An analytic hierarchy process was applied to select the most effective and efficient production method, considering CNC milling and direct metal laser sintering. A final set of decision criteria that take into account the specifics of the offshore industry sector are provided.

  • Multi-criteria Differential Evolution for Optimization of Virtual Machine Resources in Smart City Cloud
    • Jerzy Balicki
    • Honorata Balicka
    • Piotr Dryja
    • Maciej Tyszka
    2020

    In a smart city, artificial intelligence tools support citizens and urban services. From the user point of view, smart applications should bring computing to the edge of the cloud, closer to citizens with short latency. However, from the cloud designer point of view, the trade-off between cost, energy and time criteria requires the Pareto solutions. Therefore, the proposed multi-criteria differential evolution can optimize virtual machine resources in smart city clouds to find compromises between preferences of citizens and designers. In this class of distributed computer systems, smart mobile devices share computing workload with the set of virtual machines that can be migrated among the nodes of the cloud. Finally, some numerical results are studied for the laboratory cloud GUT-WUT.

  • Multifactor consciousness level assessment of participants with acquired brain injuries employing human–computer interfaces
    • Andrzej Czyżewski
    • Adam Kurowski
    • Piotr Odya
    • Piotr Szczuko
    2020 Full text Biomedical Engineering Online

    Background A lack of communication with people suffering from acquired brain injuries may lead to drawing erroneous conclusions regarding the diagnosis or therapy of patients. Information technology and neuroscience make it possible to enhance the diagnostic and rehabilitation process of patients with traumatic brain injury or post-hypoxia. In this paper, we present a new method for evaluation possibility of communication and the assessment of such patients’ state employing future generation computers extended with advanced human–machine interfaces. Methods First, the hearing abilities of 33 participants in the state of coma were evaluated using auditory brainstem response measurements (ABR). Next, a series of interactive computer-based exercise sessions were performed with the therapist’s assistance. Participants’ actions were monitored with an eye-gaze tracking (EGT) device and with an electroencephalogram EEG monitoring headset. The data gathered were processed with the use of data clustering techniques. Results Analysis showed that the data gathered and the computer-based methods developed for their processing are suitable for evaluating the participants’ responses to stimuli. Parameters obtained from EEG signals and eye-tracker data were correlated with Glasgow Coma Scale (GCS) scores and enabled separation between GCS-related classes. The results show that in the EEG and eye-tracker signals, there are specific consciousness-related states discoverable. We observe them as outliers in diagrams on the decision space generated by the autoencoder. For this reason, the numerical variable that separates particular groups of people with the same GCS is the variance of the distance of points from the cluster center that the autoencoder generates. The higher the GCS score, the greater the variance in most cases. The results proved to be statistically significant in this context. Conclusions The results indicate that the method proposed may help to assess the consciousness state of participants in an objective manner.

  • Multimedia Communications, Services and Security MCSS. 10th International Conference, MCSS 2020, Preface
    • Andrzej Dziech
    • Wim Mees
    • Andrzej Czyżewski
    2020

    Multimedia surrounds us everywhere. It is estimated that only a part of the recorded resources are processed and analyzed. These resources offer enormous opportunities to improve the quality of life of citizens. As a result, of the introduction of a new type of algorithms to improve security by maintaining a high level of privacy protection. Among the many articles, there are examples of solutions for improving the operation of monitoring systems or preventing threats in the industrial environment. The important group of issues is the creation of solutions and functionalities into ready-to-use systems. The practical use of research results was discussed during the conference. Connecting them with modern architectures is a natural necessity in the case of future implementation

  • Multimodal Genetic Algorithm with Phase Analysis to Solve Complex Equations of Electromagnetic Analysis
    • Damian Trofimowicz
    • Tomasz Stefanski
    2020 Full text

    In this contribution, a new genetic-algorithm-based method of finding roots and poles of a complex function of a complex variable is presented. The algorithm employs the phase analysis of the function to explore the complex plane with the use of the genetic algorithm. Hence, the candidate regions of root and pole occurrences are selected and verified with the use of discrete Cauchy's argument principle. The algorithm is evaluated in an electromagnetic benchmark that successfully solves the eigenvalue problem determining the propagation of surface waves along a spatially dispersive graphene sheet. The numerical results show that the possibility to find all roots and poles of the function may be limited by the initial population size, especially when the search region is large and roots and poles are located close to each other.

  • Multimodal Particle Swarm Optimization with Phase Analysis to Solve Complex Equations of Electromagnetic Analysis
    • Damian Trofimowicz
    • Tomasz Stefanski
    2020 Full text

    In this paper, a new meta-heuristic method of finding roots and poles of a complex function of a complex variable is presented. The algorithm combines an efficient space exploration provided by the particle swarm optimization (PSO) and the classification of root and pole occurrences based on the phase analysis of the complex function. The method initially generates two uniformly distributed populations of particles on the complex plane and extracts the function phase in a position of each particle. By collecting phase samples, the candidate regions of root and pole occurrences are selected. Then, the second population, by iteratively converging towards candidate regions, thoroughly explores an area outside candidate regions and reduces the possibility of root or pole omission. The subsequent swarms are generated locally to explore candidate regions and decrease their size. The algorithm is verified in electromagnetic benchmark that solves the equation determining surface waves on a microstrip antenna. The numerical results show that the algorithm is able to solve multimodal problems quickly even with a small initial population and a small number of generated swarms.

  • Multiparameter sensitivity analysis of a GFRP composite footbridge of a sandwich structure and U-shaped cross-section
    • Tomasz Ferenc
    2020 Full text COMPOSITE STRUCTURES

    The paper deals with multiparameter sensitivity analysis of a composite footbridge. A shell‐like structure is 14.5 m long shows U‐shaped cross‐section and inner service dimensions 1.3 × 2.5 m. Glass fiber reinforced polymer GFRP laminate constitutes faces of a sandwich structure while PET foam received from recycled bottle builts a core. The structure was divided into 285 independent areas where the thickness of laminates and stiffness modulus of PET foam were established as design variables. The impact of their variation on variation of state variables was investigated, vertical displacement of structure, longitudinal strain in handrail and transverse strain in deck were addressed here. Sensitivity vector was computed by a semi‐analytical method and, subsequently, expressed in a matrix form and next presented graphically in the form of sensitivity areas. The conducted sensitivity analysis exhibits areas that can be strengthened in order to minimize vertical displacement, longitudinal strain in handrail and transverse strain deck, determining the areas where parameters can be reduced without increasing the value of state variables. The obtained results are bound to support the structural design process or to improve the performance of existing structures.

  • Multiple reference frame theory in the synchronous generator model considering harmonic distortions caused by nonuniform pole shoe saturation
    • Filip Kutt
    • Michał Michna
    • Grzegorz Kostro
    2020 IEEE TRANSACTIONS ON ENERGY CONVERSION

    The paper describes a synchronous generator model developed based on the multiple reference frame theory. The main physical phenomena included in the model are the machine armature non-sinusoidal voltage waveform and the influence of armature current in load conditions on the armature voltage waveform higher harmonic components. The modified multiple reference frame theory model is proposed. In this modified theory model the field and armature currents are the cause of the non-sinusoidal airgap spatial field distribution. The influence of this airgap spatial field distribution is also investigated. The resulting nonuniform saturation of the pole shoe affects the machine voltage waveform in load conditions. Simulation and measurements of the machine performance in steady and transient states are conducted in order to validate the model.

  • Multisine impedimetric probing of biocatalytic reactions for label-free detection of DEFB1 gene: How to verify that your dog is not human?
    • Paweł Niedziałkowski
    • Paweł Ślepski
    • Joanna Wysocka
    • Joanna Chamier-Ciemińska
    • Łukasz Burczyk
    • Michał Sobaszek
    • Anna Wcisło
    • Tadeusz Ossowski
    • Robert Bogdanowicz
    • Jacek Ryl
    2020 Full text SENSORS AND ACTUATORS B-CHEMICAL

    Albert is a dog (Canis familiaris), but he does not realize this. Albert loves human food (and beer), watching movies on the internet, sleeping in bed, and more. But he should not do all these things. To convince him that, we have desinged a test procedure. The DEFB1 gene is unique to human species. Detecting its presence from saliva and in short periods may offer an advantage in the field of forensic medicine, and influence Albert’s bad habits. This study reveals novel utilization of the multisine impedance spectroscopy carried out during potentiodynamic polarization (pDEIS) of the electrode. We have utilized pDEIS to detect DEFB1 gene in collected saliva samples. The detection process was conducted at the boron-doped diamond surfaces functionalized with DEFB1-complimentary oligonucleotide sequence, anchored at the electrode surface. Next, a short-term electrode incubation in presence of target DNA sample allows for achieving DNA hybridization when exposed to human DNA material. The dsDNA orientation vs electrode surface is affected by polarization, and tracked by changes in the electrode kinetics preceded by subtle capacitance dispersion effects. The optimized measurement conditions range between +0.5 and +0.9 V vs Ag|AgCl due to nonspecific DNA adsorption, affecting heterogeneous charge transfer. The DNA hybridization is not achieved in the case of non-complimentary ssDNA originated from any other species subjected to this test. The discussed differences obtained during electrode incubation are supported by the XPS analyses.

  • Multi-transformer primary-side regulated flyback converter for supplying isolated IGBT and MOSFET drivers
    • Maciej Kolincio
    • Piotr Chrzan
    • Piotr Musznicki
    2020 Full text IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS

    This paper presents primary-side voltage regulated multi-transformer quasi-resonant flyback converter (MTFC) for supplying isolated power switch drivers. The proposed topology offers distinct advantages over frequently used flyback converter possessing one high frequency transformer with isolated multiple outputs. Particularly, when a large number of separate dc supply units is required, then MTFC enables improved regular distribution of magnetic coupling between the common primary and the multiple secondary transformers' windings providing high degree of galvanic and electromagnetic isolation between multiple outputs. Primary side voltage regulation is based on the average value of output voltages estimation using auxilliary RDC circuit mounted across the primary windings. Operation principles of MTFC are enhanced with analytical study of cross regulation of multiple output voltages at unbalanced load conditions, indicating reduced voltage deviation of multiple outputs by applying the primary-side average voltage regulation. Experimental results of prototype 2, 3, and 6-transformer quasi-resonant flyback converters confirmed their cross regulation quality and application potential for independent multiple output supplies.

  • Musical Instrument Tagging Using Data Augmentation and Effective Noisy Data Processing
    • Damian Koszewski
    • Bożena Kostek
    2020 Full text JOURNAL OF THE AUDIO ENGINEERING SOCIETY

    Developing signal processing methods to extract information automatically has potential in several applications, for example searching for multimedia based on its audio content, making context-aware mobile applications (e.g., tuning apps), or pre-processing for an automatic mixing system. However, the last-mentioned application needs a significant amount of research to reliably recognize real musical instruments in recordings. In this paper we primarily focus on how to obtain data for efficiently training, validating, and testing a deep-learning model by using a data augmentation technique. These data are transformed into 2D feature spaces, i.e., mel-scale spectrograms. The Neural Network used in the experiments consists of a single-block DenseNet architecture and a multi-head softmax classifier for efficient learning with the mixup augmentation. For automatic noisy data labeling, the batch-wise loss masking, which is robust to corrupting outliers in data, was applied. To train the models, various audio sample rates and different audio representations were utilized. The method provides promising recognition scores even with real-world recordings that contain noisy data.

  • Mutual Interaction between Temperature and DO Set Point on AOB and NOB Activity during Shortcut Nitrification in a Sequencing Batch Reactor in Terms of Energy Consumption Optimization
    • Mehdi Sharifshourjeh
    • Przemysław Kowal
    • Jakub Drewnowski
    • Bartosz Szeląg
    • Aleksandra Szaja
    • Grzegorz Łagód
    2020 Full text ENERGIES

    Recently, many wastewater treatment plants (WWTPs) have had to deal with serious problems related to the restrictive requirements regarding the euent quality, as well as significant energy consumption associated with it. In this situation, mainstream deammonification and/or shortened nitrification-denitrification via nitrite (so-called “nitrite shunt”) is a new promising strategy. This study shows the mechanisms and operating conditions (e.g., dissolved oxygen (DO) concentration, temp.), leading to the complete domination of ammonium oxidizing bacteria (AOB) over nitrite oxidizing bacteria (NOB) under aerobic conditions. Its successful application as shortcut nitrification in the sequencing batch reactor (SBR) technology will represent a paradigm shift for the wastewater industry, oering the opportunity for ecient wastewater treatment, energy-neutral or even energy-positive facilities, and substantial reductions in treatment costs. In this study, under low and moderate temperatures (10–16 C), averaged DO concentrations (0.7 mg O2/L) were preferable to ensure beneficial AOB activity over NOB, by maintaining reasonable energy consumption. Elevated temperatures (~30 C), as well as increased DO concentration, were recognized as beneficial for the NOB activity stimulation, thus under such conditions, the DO limitation seems to be a more prospective approach.

  • Nadmierne osiadania nawierzchni drogowej w ujęciu geotechnicznym - przyczyny, monitoring, możliwe metody naprawy
    • Grzegorz Horodecki
    2020

    Nadmierne osiadania nawierzchni stanowią „wieczny” problem użytkowników dróg. Z odkształceniami nawierzchni łączy się obniżenie komfortu i bezpieczeństwa jazdy (BRD). Jedną z podstawowych przyczyn takiego zjawiska jest zachowanie się podłoża gruntowego. Najczęściej dotyczy to zjawiska osiadania podłoża gruntowego, stanowiącego efekt ściśliwości gruntów w wyniku przyłożenia obciążenia i jest przekroczeniem stanów granicznych użytkowalności (SGU). W rzadszych przypadkach odkształcenia wiążą się z przekroczeniem stanu granicznego nośności (SGN).

  • NADPH Oxidase Gene Polymorphism is Associated with Mortality and Cardiovascular Events in 7-Year Follow-Up
    • Milena Racis
    • Wojciech Sobiczewski
    • Anna Stanisławska-Sachadyn
    • Marcin Wirtwein
    • Elżbieta Bluj
    • Michał Nedoszytko
    • Joanna Borzyszkowska
    • Janusz Limon
    • Andrzej Rynkiewicz
    • Marcin Gruchała
    2020 Full text Journal of Clinical Medicine

    The CYBA gene encodes the regulatory subunit of NADPH oxidase, which maintains the redox state within cells and in the blood vessels. That led us to investigate the course of coronary artery disease (CAD) with regards to CYBA polymorphisms. Thus, we recruited 1197 subjects with coronary atherosclerosis and observed them during 7-year follow-up. Three CYBA polymorphisms: c.214C>T (rs4673), c.-932G>A (rs9932581), and c.*24G>A (1049255) were studied for an association with death, major adverse cardiovascular events (MACE) and an elective percutaneous coronary intervention or coronary artery bypass grafting (PCI/CABG). We found an association between the CYBA c.214C>T polymorphism and two end points: death and PCI/CABG. CYBA c.214TT genotype was associated with a lower risk of death than C allele (9.5% vs. 21%, p < 0.05) and a higher risk of PCI/CABG than C allele (69.3% vs. 51.7%, p < 0.01). This suggests that the CYBA c.214TT genotype may be a protective factor against death OR = 0.47 (95%CI 0.28–0.82; p < 0.01), while also being a risk factor for an elective PCI/CABG OR = 2.36 (95%CI 1.15–4.82; p < 0.05). Thus, we hypothesize that among patients with coronary atherosclerosis, the CYBA c.214TT genotype contributes to atherosclerotic plaque stability by altering the course of CAD towards chronic coronary syndrome, thereby lowering the incidence of fatal CAD-related events.

  • Nagrzewanie się elementów układu obróbkowego w docieraniu powierzchni płaskich
    • Adam Barylski
    2020

    Przedstawiono analizę temperatury elementów układu wykonawczego docierarki jednotarczowej przy użyciu kamery termowizyjnej. W badaniach stosowano różne wartości prędkości obrotowej tarczy docierającej oraz dwa zakresy ziarnistości mikroziaren ściernych w dozowanej paście. Obrabiano elementy płaskie wykonane ze stali chromowo - niklowej oraz brązu berylowego.

  • Nano Tin/Tin Oxide Attached onto Graphene Oxide Skeleton as a Fluorine Free Anode Material for Lithium-Ion Batteries
    • Andrzej Nowak
    • Konrad Trzciński
    • Mariusz Szkoda
    • Grzegorz Trykowski
    • Maria Gazda
    • Jakub Karczewski
    • Marcin Łapiński
    • Dominik Maskowicz
    • Mirosław Sawczak
    • Anna Lisowska-Oleksiak
    2020 INORGANIC CHEMISTRY

    Herein, we show a composite formation method of tin/tin oxide nanoparticles with graphene oxide and CMC based on laser ablation technique as an electrode material for energy storage devices. The material exhibited a three-dimensional conducting graphene oxide network decorated with tin or tin oxide nanoparticles. The structure, homogeneous distribution of nanoparticles, and direct contact between inorganic and organic parts were confirmed by scanning electron microscopy and high-resolution transmission electron spectroscopy. Electrochemical performances of composite electrode material showed a reversible capacity of 644 mAh/g at a current density equal to 35 mA/g, and 424 mAh/g at 140 mA/g. The capacity retention of 90% after 250 cycles show that tested electrode material is suitable as a negative electrode for lithium-ion batteries.

  • Nanocrystalline diamond sheets as protective coatings for fiber-optic measurement head
    • Monika Kosowska
    • Daria Majchrowicz
    • Mateusz Ficek
    • Paweł Wierzba
    • Yafit Fleger
    • Dror Fixler
    • Małgorzata Szczerska
    2020 CARBON

    Fiber-optic sensors find numerous applications in science and industry, but their full potential is limited because of the risk of damaging the measurement head, in particular, due to the vulnerability of unprotected tips of the fiber to mechanical damage and aggressive chemical agents. In this paper, we report the first use of a new nanocrystalline diamond structure in a fiber-optic measurement head as a protective coating of the fiber tip. The nanocrystalline sheet structures, produced with the use of Microwave Plasma Assisted Chemical Vapor Deposition System (MW PA CVD), were characterized by Scanning Electron Microscopy (SEM) and successfully transferred from the deposition substrate onto the surface of the tip of a single-mode fiber sensor head. A Fabry-Perot sensing interferometer for distance measurement comprising that fiber was built. The measurement results were compared with numerical modeling. High values of achieved correlation coefficients (R2 > 0.99) between a linear model and distance measurements data indicate that the diamond sheet does not affect the correct operation of the sensor while extending its potential scope of applications.

  • Nanodiamond phantoms mimicking human liver: perspective to calibration of T1 relaxation time in magnetic resonance imaging
    • Anna Sękowska
    • Daria Majchrowicz
    • Agnieszka Sabisz
    • Mateusz Ficek
    • Barbara Bułło-Piontecka
    • Monika Kosowska
    • Lina Jing
    • Robert Bogdanowicz
    • Małgorzata Szczerska
    2020 Full text Scientific Reports

    Phantoms of biological tissues are materials that mimic the properties of real tissues. This study shows the development of phantoms with nanodiamond particles for calibration of T1 relaxation time in magnetic resonance imaging. Magnetic resonance imaging (MRI) is a commonly used and non-invasive method of detecting pathological changes inside the human body. Nevertheless, before a new MRI device is approved for use, it is necessary to calibrate it properly and to check its technical parameters. In this article, we present phantoms of tissue with diamond nanoparticles dedicated to magnetic resonance calibration. The method of producing phantoms has been described. As a result of our research, we obtained phantoms that were characterized by the relaxation time T1 the same as the relaxation time of the human tissue T1 = 810.5 ms. Furthermore, the use of diamond nanoparticles in phantoms allowed us to tune the T1 value of the phantoms which open the way to elaborated phantoms of other tissues in the future.

  • Nanofiltration in the food industry
    • Roberto Castro-Muñoz
    • Emilia Gontarek
    2020

    Nanofiltration (NF), as a pressure-driven membrane process, has been widely demonstrated to have great potential for food processing applications. There are several advantages of this membrane process over traditional methods that makes NF suitable for food processing, such as the low thermal damage to the product, higher aroma retention, lower energy consumption, and low maintenance costs. In this chapter, according to the recent literature, a review of the main areas of NF applications in the food industry is presented, such as juice and plant extract clarification and concentration, wine application, sugar industry, dairy processing, and recovery of high-added value compounds from food wastes. The productivity and the separation performance of NF membranes toward target compounds have also been discussed.

  • Nanoindentation tests titanium alloy Ti-6Al-4V after interference laser treatment
    • Magdalena Jażdżewska
    • Dominika Trochowska
    • Michał Bartmański
    2020 Full text Inżynieria Materiałowa

    The study aimed was to assess selected mechanical properties of surface layers obtained after interference laser treatment – DLIL of titanium alloy Ti-6Al-4V used for implants. The samples were melted in still air at room temperature, for this purpose Nd:YAG laser was used, the number of laser shots was variable. Next, nanoindentation tests were performed, based on which Young’s modulus and nanohardness in the obtained surface layers were determined. An increase in nanohardness is observed in the surface layers after laser melting. An increase in the modulus of elasticity and higher hardness was observed for both the first and second areas on the sample surface. In the case of a sample for which three laser beam shots were used, hardness and Young’s modulus almost doubled. On the basis of the obtained results, it was found that the modified Ti-6Al-4V alloy can be used as an implant material, and the proposed method of modifying its surface may extend the life of such implants and improve their frictional properties.

  • Nanoparticles: Synthesis, characteristics, and applications in analytical and other sciences
    • Muhammad Sajid
    • Justyna Płotka-Wasylka
    2020 Full text MICROCHEMICAL JOURNAL

    Nanoparticles (NPs) are widely employed in different research areas, ranging from analytical chemistry and environmental science to medicine, the agriculture and pharmaceutical industry. This is mainly due to the unique characteristics of NPs and the novelty they introduce in such applications. In analytical chemistry, the role of NPs can differ depending on the nature of the steps involved in analytical process. NPs are probably most useful for detection, but sample preparation has also profited from them. For instance, NPs can advantageously replace conventional sorbents for solid-phase extraction. Moreover, NPs are being increasingly used as stationary phases in gas and liquid chromatography or electrochromatography. In this review, a brief summary on the classification, synthesis methods, and properties of NPs is given. Moreover, the examples of applications in different research area are shortly presented. However, the merits of this work are to present the use of NPs in analytical chemistry field.

  • Narracje o świeżej traumie. Upamiętnianie ataków terrorystycznych w krajobrazie codziennym miast
    • Anna Awtuch
    • Agnieszka Gębczyńska-Janowicz
    2020 Full text Politeja. Pismo Wydziału Studiów Międzynarodowych i Politycznych Uniwersytetu Jagiellońskiego

    Recent trauma Narratives: commemorating terrorist attacks in Everyday cityscape Contemporary city incidentally becomes a non-accidental target of acts violating the primary sense of security and safety. The fundamental assumptions about so- cial and interpersonal interactions that guarantee social life are severely disturbed. These events, primarily the ones related to terrorist attacks, leave in social memo- ry traces associated with everyday places scattered in urban landscape. Should the trace of a catastrophe be preserved and exhibited, or should it be interpreted to give a new meaning to endangered places? What significance can one attribute to trauma narratives in everyday landscape?To what extent can spatial and ephemeral narratives related to dramatic events address the social need of coping with trauma and constructing a new approach to a given place? Spontaneous and official commemorative forms are created in response to terrorist attacks in Europe and the U.S.A. Official memorials are created over just a few years and sometimes even one year, which corresponds to a natural closure of mourning process leading to the acceptance of loss and reconstructing life. However, other representations – spontaneous memorials created in the aftermath of attacks, composed of objects left in urban space to honour victims and survivors – become an important element of collective mourning ritual and constitute a transition from informal commemoration to top-down representations. The article discusses how different forms of trauma narratives constructed in urban space can enhance trauma recovery.

  • Natural carbon-based quantum dots and their applications in drug delivery: A review
    • Akhila Nair
    • Józef Haponiuk
    • Sabu Thomas
    • Sreeraj Gopi
    2020 Full text BIOMEDICINE & PHARMACOTHERAPY

    Natural carbon based quantum dots (NCDs) are an emerging class of nanomaterials in the carbon family. NCDs have gained immense acclamation among researchers because of their abundance, eco-friendly nature, aqueous solubility, the diverse functionality and biocompatibility when compared to other conventional carbon quantum dots (CDs).The presence of different functional groups on the surface of NCDs such as thiol, carboxyl, hydroxyl, etc., provides improved quantum yield, physicochemical and optical properties which promote bioimaging, sensing, and drug delivery. This review provides comprehensive knowledge about NCDs for drug delivery applications by outlining the source and rationale behind NCDs, different routes of synthesis of NCDs and the merits of adopting each method. Detailed information regarding the mechanism behind the optical properties, toxicological profile including biosafety and biodistribution of NCDs that are favourable for drug delivery are discussed. The drug delivery applications of NCDs particularly as sensing and real-time tracing probe, antimicrobial, anticancer, neurodegenerative agents are reviewed. The clinical aspects of NCDs are also reviewed as an initiative to strengthen the case of NCDs as potent drug delivery agents.

  • Nauka w świecie cyfrowym okiem młodego inżyniera - metody i aplikacje wspomagające uczenie
    • Konrad Witek
    • Damian Białobrzycki
    • Tomasz Skiba
    • Przemysław Falkowski-Gilski
    2020 Pismo PG

    W niniejszym artykule opisano metody uczenia się oraz popularne aplikacje wspomagające przyswajanie wiedzy. Jest to kontynuacja poprzedniej części, poświęconej procesowi uczenia oraz najpopularniejszym technikom. Zawarte informacje można traktować jako wskazówki dla osób w trakcie tzw. instytucjonalnej nauki - szkoła, studia, kursy doszkalające - związanej z ciągłą potrzebą samodoskonalenia i podnoszenia kwalifikacji.

  • Nauka w świecie cyfrowym okiem młodego inżyniera – proces i techniki uczenia
    • Konrad Witek
    • Damian Białobrzycki
    • Tomasz Skiba
    • Przemysław Falkowski-Gilski
    2020 Pismo PG

    W obecnym świecie, z uwagi na wszechobecność cyfrowych urządzeń, odtwarzaczy multimedialnych itp., trudno jest skupić uwagę na pojedynczej czynności. Z kolei wzrost dostępnych źródeł informacji powoduje niekiedy rozproszenie i problemy z koncentracją. Naturalne wydaje się skorzystanie z urządzenia osobistego, które posiada niemal każdy z nas, czyli smartfona, w celu poprawy koncentracji i systematycznej pracy. W niniejszym artykule opisano proces uczenia się oraz techniki przyswajania wiedzy. Zawarte informacje traktować można jako wskazówki dla osób w trakcie tzw. instytucjonalnej nauki - szkoła, studia, kursy doszkalające- związanej z ciągłą potrzebą samodoskonalenia i podnoszenia kwalifikacji.

  • Naukowcy pracują nad poprawą efektywności terapii borowo-neutronowej w chorobach nowotworowych
    • Brygida Mielewska
    • Marek Maryański
    • Edyta Michaś
    2020 Pismo PG

    Badacze konsorcjum zamierzają wspólnie wypracować nowatorską metodologię, która znacznie poprawi kliniczną efektywność terapii boro- wo-neutronowej chorób nowotworowych. Technologia wypracowana przez konsorcjum stanie się podstawą nowych produktów i usług dla klinik onkologicznych w skali globalnej.

  • Near Field Coupled Wireless Microwave Sensor
    • Abhishek Jha
    • Adam Lamęcki
    • Roberto Gomez-Garcia
    • Michał Mrozowski
    2020 Full text

    This paper presents a wireless planar microwave sensor operating at industrial scientific and medical (ISM) frequency for the detection of dielectric materials. The microwave sensor consists of a reader (ground defected microstrip coupled line) and a passive tag where a complementary split-ring resonator (CSRR) is made on the commercially available copper-foil. The CSRR is a peel-off type tag that is excited using the near field of microstrip coupled transmission line. The near field coupling, the low-cost passive tag design, and the high sensitivity (~250 MHz change per unit change in dielectric constant) make the proposed sensor wireless, cost-effective, and reliable.