2020 - Repozytorium publikacji - Politechnika Gdańska

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Publikacje z roku 2020

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Ultrasound assisted solvent extraction of porous membrane-packed samples followed by liquid chromatography-tandem mass spectrometry for determination of BADGE, BFDGE and their derivatives in packed vegetables
- Natalia Szczepańska
- Paweł Kubica
- Justyna Płotka-Wasylka
- Błażej Kudłak
- Jacek Namieśnik
2020 Pełny tekst SCIENCE OF THE TOTAL ENVIRONMENT
The problem of the presence of trace organic pollutants in food is of growing importance due to increasing awareness about their impact on newborns, infants and adults of reproductive age. Despite the fact that packaged food products offer many advantages, packaging can be a source of contamination for stored food. Thus, monitoring such pollution in food is of high importance. In this work, a novel methodology based on the solvent extraction of porous membrane-packed samples followed by liquid chromatography-tandem mass spectrometry was applied for the determination of bisphenol A diglycidyl ether (BADGE), bisphenol F diglycidyl ether (BFDGE) and their derivatives in packed vegetables. Several parameters of the extraction process were optimized, including the volume and type of extraction solvent as well as the sonication time. Due to advantages such as simplicity of use, short analysis time, and a reduction in the required amount solvent, the developed procedure can be considered green. In addition, the developed methodology was characterized by good validation parameters. Limit if quantitation (LOQ) was found to be in the range of 0.8 to 1.5 ng/g. The obtained recoveries varied from 78.3% to 111.2%. The repeatability of the extraction ranged between 0.6% and 5.8% (RSD). The proposed method was successfully applied to determine the presence of BADGE, BFDGE and their derivative compounds in the vegetable samples stored in different types of containers. The obtained data indicate that the majority of investigated samples were contaminated by chlorinated and hydroxyl derivatives of BADGE.
Ultrasound assisted synthesis of 3-alkynyl substituted 2-chloroquinoxaline derivatives: Their in silico assessment as potential ligands for N-protein of SARS-CoV-2
- Shaik Shahinshavali
- Kazi Hossain
- Abbaraju Venkata Durga Nagendra Kumar
- Alugubelli Gopi Reddy
- Deepti Kolli
- Ali Nakhi
- Mandava Venkata Basaveswara Rao
- Manojit Pal
2020 TETRAHEDRON LETTERS
In view of recent global pandemic the 3-alkynyl substituted 2-chloroquinoxaline framework has been explored as a potential template for the design of molecules targeting COVID-19. Initial in silico studies of representative compounds to assess their binding affinities via docking into the N-terminal RNA-binding domain (NTD) of N-protein of SARS-CoV-2 prompted further study of these molecules. Thus building of a small library of molecules based on the said template became essential for this purpose. Accordingly, a convenient and environmentally safer method has been developed for the rapid synthesis of 3-alkynyl substituted 2-chloroquinoxaline derivatives under Cu-catalysis assisted by ultrasound. This simple and straightforward method involved the coupling of 2,3-dichloroquinoxaline with commercially available terminal alkynes in the presence of CuI, PPh3 and K2CO3 in PEG-400. Further in silico studies revealed some remarkable observations and established a virtual SAR (Structure Activity Relationship) within the series. Three compounds appeared as potential agents for further studies.
Ultrasound-assisted heterogeneous activation of persulfate and peroxymonosulfate by asphaltenes for the degradation of BTEX in water
- Kirill Fedorov
- Maksymilian Plata-Gryl
- Javed Khan
- Grzegorz Boczkaj
2020 Pełny tekst JOURNAL OF HAZARDOUS MATERIALS
This study investigated – for the first time - the simultaneous degradation of benzene, toluene, ethylbenzene and o-xylene (BTEX) by persulfate (PS) and peroxymonosulfate (PMS) activated by asphaltenes (Asph) under ultrasound (US) irradiation. Advantageous properties such as high thermal stability, low production cost and extensive availability make asphaltenes as an appealing carbonaceous material for heterogeneous catalysis. The application of asphaltenes in PS/US increased the degradation of BTEXs from 31%, 34%, 35%, 32% to 78%, 94%, 98% and 98%, while the removal of these compounds in PMS/US system was improved from 26%, 27%, 24%, 20% to 76%, 91%, 97%, 97%, respectively. PS and PMS activation followed a typical sulfate-radical based advanced oxidation processes. In terms of activation of PS and PMS, the particles of asphaltenes intensified formation of reactive radicals by creating additional centers of cavitational events. Moreover, owing to π–π stacking interaction between asphaltenes and sp2-hybridized systems of BTEX, the contaminants undergo adsorption on the surface of asphaltenes and subsequent oxidation by formed radicals. The radical route of BTEX degradation in both PS/US/Asph and PMS/US/Asph systems was mainly contributed by sulfate (SO4•−) and hydroxyl radicals (HO•) and coexisting superoxide radical anions (O2•−) played a minor role.
Ultrastructural analysis of the submandibular sialoliths: Raman spectroscopy and electron back-scatter studies
- Dmitry Tretiakov
- Andrzej Skorek
- Jacek Ryl
- Joanna Wysocka
- Kazimierz Darowicki
- Dmitry Tretiakow
2020 Pełny tekst ULTRASTRUCTURAL PATHOLOGY
The aim of work was the epidemiological analysis of the occurrence of sialolithiasis of the submandibular gland in adults and the evaluation of the ultrastructure of salivary stones. The study sample consisted of 44 sialoliths. Analysis of the structure and chemical composition of sialoliths was performed using a Scanning Electron Microscope and Raman Spectroscopy. Comparing our results with the literature we can say that the epidemiology of sialolithiasis has not changed significantly over the past 50 years. A wide variety of sialoliths structure was observed. In 75% (33) cases a layered structure of salivary stones was observed, while in 25% (11) – homogeneous structure. The various distribution of organic and inorganic components was observed among all the analyzed sialoliths. Raman spectroscopy allows for preliminary analysis of the sialoliths structure with only a qualitative assessment of their composition, which significantly reduces the research value of this method. The presence of organic and inorganic compounds in the core and inner layers of the salivary glands stones confirms 2 basic theories of the formation of sialoliths: inflammation and deposition of the inorganic component as a result of disruption of saliva flow in the salivary glands.
Uncertainty of mass flow measurement using centric and eccentric orifice for Reynolds number in the range 10,000 ≤ Re ≤ 20,000
- Anna Golijanek-Jędrzejczyk
- Andrzej Mrowiec
- Robert Hanus
- Marcin Zych
- Dariusz Świsulski
2020 Pełny tekst MEASUREMENT
The article analyses the impact of the Reynolds number on the estimated uncertainty of the mass flow rate measurement using an orifice plate. The objects of the research were two types of orifices: centric (ISA) and eccentric, with the diameter ratio β = 0.5. Studies were performed by Monte Carlo simulation and experiments for Reynolds numbers in the range 10,000 ≤ Re ≤ 20,000. The obtained results have shown that for both orifice types, the results obtained from the experiments and from the Monte Carlo simulation are similar. The nature of changes in the expanded uncertainty of the flow measurement is very similar for each type. For the both types of orifices, the value of the expanded uncertainty of the flow measurement increases linearly with the increasing Reynolds number.
Underfrequency Load Shedding: An Innovative Algorithm Based on Fuzzy Logic
- Robert Małkowski
- Janusz Nieznański
2020 Pełny tekst ENERGIES
In contemporary power systems, the load shedding schemes are typically based on disconnecting a pre-specified amount of load after the frequency drops below a predetermined value. The actual conditions at the time of disturbance may largely dier from the assumptions, which can lead to non-optimal or ineective operation of the load shedding scheme. For many years, increasing the eectiveness of the underfrequency load shedding (UFLS) schemes has been the subject of research around the world. Unfortunately, the proposed solutions often require costly technical resources and/or large amounts of real-time data monitoring. This paper puts forth an UFLS scheme characterized by increased eectiveness in the case of large disturbances and reduced disconnected power in the case of small and medium disturbances compared to the conventional load-shedding solutions. These advantages are achieved by replacing time-consuming consecutive load dropping with the simultaneous load dropping mechanism and by replacing ineective fixed-frequency activation thresholds independent of the state of the system with implicit adaptive thresholds based on fuzzy logic computations. The proposed algorithm does not require complex and costly technical solutions. The performance of the proposed scheme was validated using multivariate computer simulations. Selected test results are included in this paper.
Understanding the formation of metastable furan dication in collisions with ions
- Ewa Erdmann
- Suvasthika Indrajith
- Jacopo Chiarinelli
- Sergio Díaz-Tendero
- Nestor F. Aguirre
- Manuel Alcamí
- Alicja Domaracka
- Patrick Rousseau
- Bernd Alan Huber
- Paola Bolognesi
- Lorenzo Avaldi
- Marta Łabuda
2020 Pełny tekst Journal of Physics : Conference Series
This work relies on complementary theoretical and experimental studies of the processes induced by ion-furan collisions. Results of the Molecular Dynamics simulations and exploration of the energy profiles combined with coincidence mass spectrometry provide complete picture of the fragmentation of furan dication.
Underwater in situ local heat treatment by additional stitches for improving the weldability of steel
- Jacek Tomków
- Anna Janeczek
2020 Pełny tekst Applied Sciences-Basel
In this paper the influence of in situ local heat treatment performed by additional stitches on the weldability of high-strength low-alloy (HSLA) S355J2C+N steel was tested. The investigated steel is characterized by high susceptibility to cold cracking. It is necessary to find a method to improve the quality of welded joints. The local heat treatment was applied as an eect of bead-on plate welding made on the face of a Tekken test joint. The specimens were made by the use of covered electrodes in the water environment. For testing weldability, Tekken test specimens were made. Then, the dierent number of the pad welds with dierent overlapping were laid on the face of the tested welds. Non-destructive (NDT) visual and penetrant tests were undertaken. During the NDT, imperfections like shape mistakes and spatters were found. Then, metallographic macro- and microscopic testing were performed. The macroscopic observations proved that water environment can generate imperfections like cracking and pores. However, for specimens with additional stitches the number of imperfections decreased. Microscopic tests proved that the proposed technique aected the structure of the heat-aected zone (HAZ). The specimens without the application of additional stitches are characterized by brittle bainitic and martensitic structure. Specimens, in which the additional stitches were applied, contain tempered martensite, fine ferrite and fine pearlite in their HAZ. It was also observed that the number of cracks decreased for in situ local heat-treatment specimens. The final step was Vickers HV10 hardness measurement. These measurements confirmed previous results. The heat from additional stitches aected the steel by significantly decreasing the hardness by 80–100 HV10. The results of experiments showed that the heat from pad welds provided microstructural changes in heat-aected zones and a decrease in the susceptibility to cold cracking, which results in improvement in the weldability of HSLA steel in wet welding conditions.
Underwater Local Cavity Welding of S460N Steel
- Jacek Tomków
- Anna Janeczek
- Grzegorz Rogalski
- Adrian Wolski
2020 Pełny tekst Materials
In this paper, a comparison of the mechanical properties of high-strength low-alloy S460Nsteel welded joints is presented. The welded joints were made by the gas metal arc welding (GMAW)process in the air environment and water, by the local cavity welding method. Welded joints were testedfollowing the EN ISO 15614-1:2017 standard. After welding, the non-destructive—visual, penetrant,radiographic, and ultrasonic (phased array) tests were performed. In the next step, the destructive tests,as static tensile-, bending-, impact- metallographic (macroscopic and microscopic) tests, and VickersHV10 measurements were made. The influence of weld porosity on the mechanical properties of thetested joints was also assessed. The performed tests showed that the tensile strength of the jointsmanufactured in water (567 MPa) could be similar to the air welded joint (570 MPa). The standarddeviations from the measurements were—47 MPa in water and 33 MPa in the air. However, it was alsostated that in the case of a complex state of stress, for example, bending, torsional and tensile stresses,the welding imperfections (e.g., pores) significantly decrease the properties of the welded joint.In areas characterized by porosity the tensile strength decreased to 503 MPa. Significant differenceswere observed for bending tests. During the bending of the underwater welded joint, a smallerbending angle broke the specimen than was the case during the air welded joint bending. Also,the toughness and hardness of joints obtained in both environments were different. The minimumtoughness for specimens welded in water was 49 J (in the area characterized by high porosity) and inthe air it was 125 J (with a standard deviation of 23 J). The hardness in the heat-affected zone (HAZ)for the underwater joint in the non-tempered area was above 400 HV10 (with a standard deviation of37 HV10) and for the air joint below 300 HV10 (with a standard deviation of 17 HV10). The performedinvestigations showed the behavior of S460N steel, which is characterized by a high value of carbonequivalent (CeIIW) 0.464%, during local cavity welding.
Underwater Navigation Ssystem Based on Doppler Shift – Measurements and Error Estimations
- Zawisza Ostrowski
- Roman Salamon
- Iwona Kochańska
- Jacek Marszal
2020 Pełny tekst Polish Maritime Research
A new acoustic navigation system was developed to determine the position and speed of moving underwater objects such as divers and underwater vehicles. The path of an object and its speed were determined by the Doppler shifts of acoustic signals emitted by a transmitter placed on the object and received by four hydrophones installed at the periphery of the monitored body of water. The position and speed measurements were affected by errors mainly caused by acoustic reflections (returns) from the water body boundaries and surface reverberations. This paper discusses the source of the disturbances with the results of a simulation test and experimental measurements. It was demonstrated that the magnitude of the errors could be acceptable in most of the potential applications of the acoustic navigation system.
Unidirectional DC/DC Converter with Voltage Inverter for Fast Charging of Electric Vehicle Batteries
- Jerzy, Ryszard Szymanski
- Marta Żurek-mortka
- Daniel Wojciechowski
- Nikolai Poliakov
2020 Pełny tekst ENERGIES
The paper proposes the adaptation of the industrial plant’s power network to supply electric vehicle (EV) fast-charging converters (above 300 kW) using renewable energy sources (RESs). A 600 V DC microgrid was used to supply energy from RESs for the needs of variable speed motor drives and charging of EV batteries. It has been shown that it is possible to support the supply of drive voltage frequency converters (VFCs) and charging of EV batteries converters with renewable energy from a 600 V DC microgrid, which improves the power quality indicators in the power system. The possibility of implementing the fast EV batteries charging station to the industrial plant’s power system in such a way that the system energy demand is not increased has also been shown. The EV battery charging station using the drive converter has been presented, as well as the results of simulation and laboratory tests of the proposed solution.
Unieuro
- Luciano Segreto
2020
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Unifying Aspects of Generalized Calculus
- Marek Czachor
2020 Pełny tekst ENTROPY
Non-Newtonian calculus naturally unifies various ideas that have occurred over the years in the field of generalized thermostatistics, or in the borderland between classical and quantum information theory. The formalism, being very general, is as simple as the calculus we know from undergraduate courses of mathematics. Its theoretical potential is huge, and yet it remains unknown or unappreciated.
Unlocking creativity with new technologies
- Norbert Piotrowski
2020 World Aerosols. The Voice of the Aerosol Industry
Artificial intelligence, augmented and virtual reality, Internet of Things and digital twins are just a few concepts related to the fourth industrial revolution that is happening right before our eyes. The key question asked by managers in the aerosol sector recently is: what does all this new technology mean to me?
Untargeted Lipidomics Analysis of the Cyanobacterium Synechocystis sp. PCC 6803: Lipid Composition Variation in Response to Alternative Cultivation Setups and to Gene Deletion
- Weronika Hewelt-Belka
- Agata Kot-Wasik
- Paula Tamagnini
- Paulo Oliveira
2020 Pełny tekst INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
Cyanobacteria play an important role in several ecological environments, and they are widely accepted to be the ancestors of chloroplasts in modern plants and green algae. Cyanobacteria have become attractive models for metabolic engineering, with the goal of exploring them as microbial cell factories. However, the study of cyanobacterial lipids’ composition and variation, and the assessment of the lipids’ functional and structural roles have been largely overlooked. Here, we aimed at expanding the cyanobacterial lipidomic analytical pipeline by using an untargeted lipidomics approach. Thus, the lipid composition variation of the model cyanobacterium Synechocystis sp. PCC 6803 was investigated in response to both alternative cultivation setups and gene deletion. This approach allowed for detecting differences in total lipid content, alterations in fatty-acid unsaturation level, and adjustments of specific lipid species among the identified lipid classes. The employed method also revealed that the cultivation setup tested in this work induced a deeper alteration of the cyanobacterial cell lipidome than the deletion of a gene that results in a dramatic increase in the release of lipid-rich outer membrane vesicles. This study further highlights how growth conditions must be carefully selected when cyanobacteria are to be engineered and/or scaled-up for lipid or fatty acids production.
Upper Limb Bionic Orthoses: General Overview and Forecasting Changes
- Gustaw Rzyman
- Jacek Szkopek
- Grzegorz Redlarski
- Aleksander Pałkowski
2020 Pełny tekst Applied Sciences-Basel
Using robotics in modern medicine is slowly becoming a common practice. However, there are still important life science fields which are currently devoid of such advanced technology. A noteworthy example of a life sciences field which would benefit from process automation and advanced robotic technology is rehabilitation of the upper limb with the use of an orthosis. Here, we present the state-of-the-art and prospects for development of mechanical design, actuator technology, control systems, sensor systems, and machine learning methods in rehabilitation engineering. Moreover, current technical solutions, as well as forecasts on improvement, for exoskeletons are presented and reviewed. The overview presented might be the cornerstone for future research on advanced rehabilitation engineering technology, such as an upper limb bionic orthosis.
Uproszczone metody obliczania cylindrycznych silosów z blachy falistej i słupów cienkościennych
- Karol Rejowski
- Piotr Iwicki
- Andrzej Tejchman-Konarzewski
2020 Pełny tekst Inżynieria i Budownictwo
Celem artykułu jest wyznaczenie nośności wyboczeniowej trzech silosów wykonanych z falistej blachy ze sfałdowaniem w kierunku obwodowym, wzmocnionych słupami pionowymi stosując modele MES całych konstrukcji i ich segmentów oraz porównanie obliczonej nośności wyboczeniowej z Eurokodem 3, poprawkami do Eurokodu 3 i metodą zaproponowaną w literaturze. Nowym elementem analizowanym w pracy jest porównanie różnych metod analitycznych z wynikami analiz MES oraz procedurami normowymi. W artykule zweryfikowano także metodę opisaną w literaturze dla silosów, w których słupy miały zmienny przekrój poprzeczny, dopasowany do wypadkowych obciążeń w słupach.
Urban regeneration in urban functional areas in Poland as an instrument of implementation of the EU Cohesion Policy
- Dorota Kamrowska-Załuska
- Hanna Obracht-Prondzyńska
2020 GROWTH AND CHANGE
This study examines the role of urban regeneration policies in planning and governance within urban functional areas (UFAs) in Poland, in the context of the EU Cohesion Policy (CP). The empirical part of this study is based on comparing the approaches adopted in two Polish regions: Pomerania and Silesia. We describe the first successes but also the bottlenecks of the process, from negotiations and programming up to the implementation of the first tranche of integrated projects. We consider the factors that strengthen planning and governance within UFAs, while simultaneously influencing the local development, and territorial impacts of the EU Cohesion Policy in the given regions. This study is based on interviews with national, regional, and local actors. It defines the role of urban regeneration policies in shaping local socio‐economic and spatial development in these regions and identifies the conditions required for the implementation of urban regeneration in functional areas. We also draw lessons for the future CP programming period from the experience of Polish regions, among the main beneficiaries of the EU Cohesion Policy. By evaluating the influence of Cohesion Policy at different government levels, our study may influence the discourse on its future, particularly in the context of strengthening the cooperation and multilevel governance.
Urban Vegetation in Air Quality Management: A Review and Policy Framework
- Joanna Badach
- Małgorzata Dymnicka
- Andrzej Baranowski
2020 Pełny tekst Sustainability
Recent episodes of high air pollution concentration levels in many Polish cities indicate the urgent need for policy change and for the integration of various aspects of urban development into a common platform for local air quality management. In this article, the focus was placed on the prospects of improving urban air quality through proper design and protection of vegetation systems within local spatial planning strategies. Recent studies regarding the mitigation of air pollution by urban greenery due to deposition and aerodynamic effects were reviewed, with special attention given to the design guidelines resulting from these studies and their applicability in the process of urban planning. The conclusions drawn from the review were used to conduct three case studies: in Gdańsk, Warsaw, and Poznan, Poland. The existing local urban planning regulations for the management of urban greenery were critically evaluated in relation to the findings of the review. The results indicate that the current knowledge regarding the improvement of urban air quality by vegetation is not applied in the process of urban planning to a sufficient degree. Some recommendations for alternative provisions were discussed.
Urchin-like TiO2 structures decorated with lanthanide-doped Bi2S3 quantum dots to boost hydrogen photogeneration performance
- Magdalena Miodynska
- Alicja Mikolajczyk
- Beata Bajorowicz
- Julia Zwara
- Tomasz Klimczuk
- Wojciech Lisowski
- Grzegorz Trykowski
- Henry P. Pinto
- Adriana Zaleska-Medynska
2020 Pełny tekst APPLIED CATALYSIS B-ENVIRONMENTAL
The formation of heterojunctions between wide- and narrow-bandgap photocatalysts is commonly employed to boost the efficiency of photocatalytic hydrogen generation. Herein, the photoactivity of urchin-like rutile particles is increased by decorating with pristine as well as Er- or Yb-doped Bi2S3 quantum dots (QDs) at varied QD loadings (1–20 wt%) and doping degrees (1–15 mol%), and the best hydrogen evolution performance is achieved at Er and Yb contents of 10 mol%. Specifically, a hydrogen productivity of 1576.7 μmol gcat −1 is achieved after 20-h irradiation for TiO2 decorated by 10 mol% Yb-doped Bi2S3 QDs. Theoretical calculations show that the introduction of defects into the Bi2S3 lattice through Er/Yb doping promotes the creation of new energy levels and facilitates the transport of photogenerated charges during photocatalysis.