2020 - Repozytorium publikacji - Politechnika Gdańska

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Bringing Bathymetry LiDAR to Coastal Zone Assessment: A Case Study in the Southern Baltic
- Paweł Tysiąc
2020 Pełny tekst Remote Sensing
One of the major tasks in environmental protection is monitoring the coast for negative impacts due to climate change and anthropopressure. Remote sensing techniques are often used in studies of impact assessment. Topographic and bathymetric procedures are treated as separate measurement methods, while methods that combine coastal zone analysis with underwater impacts are rarely used in geotechnical analyses. This study presents an assessment of the bathymetry airborne system used for coastal monitoring, taking into account environmental conditions and providing a comparison with other monitoring methods. The tests were carried out on a section of the Baltic Sea where, despite successful monitoring, coastal degradation continues. This technology is able to determine the threat of coastal cliff erosion (based on the geotechnical analyses). Shallow depths have been reported to be a challenge for bathymetric Light Detection and Ranging (LiDAR), due to the difficulty in separating surface, water column and bottom reflections from each other. This challenge was overcome by describing the classification method used which was the CANUPO classification method as the most suitable for the point cloud processing. This study presents an innovative approach to identifying natural hazards, by combining analyses of coastal features with underwater factors. The main goal of this manuscript is to assess the suitability of using bathymetry scanning in the Baltic Sea to determine the factors causing coastal erosion. Furthermore, a geotechnical analysis was conducted, taking into account geometrical ground change underwater. This is the first study which uses a coastal monitoring approach, combining geotechnical computations with remote sensing data. This interdisciplinary scientific research can increase the awareness of the environmental processes.
Buckling analysis of a non-concentric double-walled carbon nanotube
- Mohammad Malikan
- Victor Eremeev
- Hamid M. Sedighi
2020 Pełny tekst ACTA MECHANICA
On the basis of a theoretical study, this research incorporates an eccentricity into a system of compressed double-walled carbon nanotubes (DWCNTs). In order to formulate the stability equations, a kinematic displacement with reference to the classical beam hypothesis is utilized. Furthermore, the influence of nanoscale size is taken into account with regard to the nonlocal approach of strain gradient and the van der Waals interaction for both inner and outer tubes is also considered based on the Lennard-Jones model. Galerkin decomposition technique is employed to numerically deal with the governing equations. It is evidently demonstrated that the geometrical eccentricity remarkably affects the stability threshold and its impact is to increase the static stability of DWCNTs.
Budownictwo morskie. Wybrane zagadnienia wraz z przykładami obliczeniowymi
- Waldemar Magda
2020
Jednym z głównych zadań projektanta budowli morskiej jest poprawne uwzględnienie kombinacji oddziaływań takich czynników jak: falowanie, prądy morskie, wiatr, zjawiska sejsmiczne. Innym istotnym elementem jego pracy jest zagwarantowanie spełnienia warunków stateczności budowli poprzez umiejętną analizę współoddziaływania środowiska morskiego i budowli morskiej z jednoczesnym interaktywnym projektowaniem geometrii budowli oraz doborem właściwych parametrów materiałowych. Niniejsza publikacja dotyczy wybranych zagadnień związanych z inżynierią morską. Na przykładzie typowych budowli morskich: falochronu pionowościennego, falochronu narzutowego oraz rurociągu podmorskiego przedstawiono metody umożliwiające określenie obciążenia tych budowli – zarówno w postaci obciążenia hydrostatycznego, jak i obciążenia hydrodynamicznego. Autor krok po kroku prezentuje szczegółowe rozwiązania licznych zadań rachunkowych, w których uwzględniono typowe schematy obciążeń, możliwe do zaistnienia w warunkach rzeczywistej pracy budowli morskiej. Aby ułatwić Czytelnikowi do maksimum osiągnięcie pozytywnych wyników samokształcenia na bazie prezentowanej książki, autor daje Czytelnikowi możliwość skorzystania z darmowej wersji wykonawczej autorskiego programu komputerowego, przygotowanego specjalnie jako uzupełnienie materiału przedstawionego w książce. Książka przeznaczona jest dla pracowników biur projektów budownictwa hydrotechnicznego, osób na stanowiskach związanych z projektowaniem, wykonawstwem i nadzorem w czasie procesu inwestycyjnego, a także pracowników naukowych oraz studentów budownictwa hydrotechnicznego i inżynierii morskiej i brzegowej.
Bulk-Surface Modification of Nanoparticles for Developing Highly-Crosslinked Polymer Nanocomposites
- Maryam Jouyandeh
- Mohammad Ganjali
- Mustafa Aghazadeh
- Sajjad Habibzadeh
- Krzysztof Formela
- Mohammad Saeb
2020 Pełny tekst Polymers
Surface modification of nanoparticles with functional molecules has become a routine method to compensate for diffusion-controlled crosslinking of thermoset polymer composites at late stages of crosslinking, while bulk modification has not carefully been discussed. In this work, a highly-crosslinked model polymer nanocomposite based on epoxy and surface-bulk functionalized magnetic nanoparticles (MNPs) was developed. MNPs were synthesized electrochemically, and then polyethylene glycol (PEG) surface-functionalized (PEG-MNPs) and PEG-functionalized cobalt-doped (Co-PEG-MNPs) particles were developed and used in nanocomposite preparation. Various analyses including field-emission scanning electron microscopy, Fourier-transform infrared spectrophotometry (FTIR), thermogravimetric analysis (TGA), X-ray diffraction (XRD) and vibrating sample magnetometry (VSM) were employed in characterization of surface and bulk of PEG-MNPs and Co-PEG-MNPs. Epoxy nanocomposites including the aforementioned MNPs were prepared and analyzed by nonisothermal differential scanning calorimetry (DSC) to study their curing potential in epoxy/amine system. Analyses based on Cure Index revealed that incorporation of 0.1 wt.% of Co-PEG-MNPs into epoxy led to Excellent cure at all heating rates, which uncovered the assistance of bulk modification of nanoparticles to the crosslinking of model epoxy nanocomposites. Isoconversional methods revealed higher activation energy for the completely crosslinked epoxy/Co-PEG-MNPs nanocomposite compared to the neat epoxy. The kinetic model based on isoconversional methods was verified by the experimental rate of cure reaction.
Burnout as a State: Random-Intercept Cross-Lagged Relationship Between Exhaustion and Disengagement in a 10-Day Study
- Beata Basińska
- Ewa Gruszczyńska
2020 Pełny tekst Psychology Research and Behavior Management
Background: Burnout has been traditionally seen as a chronic and stable state in response to prolonged stress. However, measures of momentary burnout are not well established, even though the within-person approach suggests that the symptoms of burnout may vary from day to day for the same employee. The aim of this study is to examine the daily inter- and intra-personal variability of the symptoms of burnout and the cross-lagged relationship between two components of burnout, exhaustion and disengagement. Methods: An online diary study over 10 consecutive workdays was conducted among 235 civil servants (75% women, average tenure of 15 years). Daily burnout was measured with the eight-item Oldenburg Burnout Inventory. Results: The intra-class correlation coefficients indicate that, although significant betweenperson variability exists, most of the burnout variance is within persons. Using the random intercept cross-lagged panel (RI-CLP) model to control for these between-person differences, mainly insignificant “pure” within-person cross-lagged relationships between exhaustion and disengagement were revealed. Moreover, day-to-day autoregressive effects were weaker than same-day residual correlations. Conclusion: This is one of the first studies to use daily diaries and the RI-CLP model to study burnout, including the separation of the more stable and more dynamic parts of each component. When stable parts were controlled for, the same-day relationships between exhaustion and disengagement were more pronounced than day-to-day effects. This might suggest stronger situational influences than carryover mechanism. Thus, conceptualizing burnout in terms of daily symptoms may shed promising insights into how it develops and add implications for pro-healthy changes in the workplace.
Burnout as a State: Random-Intercept Cross-Lagged Relationship Between Exhaustion and Disengagement in a 10-Day Study [Response to Letter]
- Beata Basińska
- Ewa Gruszczyńska
2020 Psychology Research and Behavior Management
We are writing in response to the Letter to the Editor by Block, Bair, and Carillo regarding our study, which took a multilevel approach to examine cross-lagged and co-existing relationships between exhaustion and disengagement, measured daily for ten consecutive working days using the Oldenburg Burnout Inventory (OLBI). We assessed the job burnout symptoms using only eight items, all of them worded negatively. Following Block, Bair, and Carillo’s request, we are happy to provide supplementary cross-sectional results from the first day of our study.
Buzz-based recognition of the honeybee colony circadian rhythm
- Tymoteusz Cejrowski
- Julian Szymański
- Doina Logofătu
2020 Pełny tekst COMPUTERS AND ELECTRONICS IN AGRICULTURE
Honeybees are one of the highly valued pollinators. Their work as individuals is appreciated for crops pollination and honey production. It is believed that work of an entire bee colony is intense and almost continuous. The goal of the work presented in this paper is identification of bees circadian rhythm with a use of sound-based analysis. In our research as a source of information on bee colony we use their buzz that have been analysed using algorithms. For the purpose of bees day/night definition, a dedicated electronic system has been developed. The data analysis involves demonstration of the circadian rhythm based on the RMS signal level. Method for defining the start and end of the presumed bees’ night was also presented. Mel Frequency Cepstral Coefficients (MFCCs) features and SVM classifier were used. The performed experiment shown the existence of repetitive cycles, which may indicate the presence of bee night. An attempt was made to estimate the time range of this phenomenon.
Can high hydrostatic pressure processing be the best way to preserve human milk?
- Edyta Malinowska-Pańczyk
2020 Pełny tekst TRENDS IN FOOD SCIENCE & TECHNOLOGY
Breastfeeding is one of the most important factors influencing proper child development. When a mother cannot breastfeed, the best alternative, especially for feeding premature infants, is to then use of human milk (HM) which has been collected, preserved and stored in Human Milk Banks (HMB). Scope and approach: In this review, the impact of some stages of the management of HM in HMB on its final biological value and microbiological safety are described. Negative changes in HM components begin during the first stage of frozen storage. In the next stages, further losses occur, which largely depend on the applied method of microbiota elimination. Complete inactivation of milk microbiota can be achieved after pressurization in the range 500-600 MPa, but similarly for holder pasteurization (HoP), in these conditions unfavorable changes in the milk components take place. At lower pressures, the changes are smaller, but microbiological safety of HM is not achieved. Key findings and conclusions: Replacing HoP with pressurization does not seem to be justified so far, not only because of the small differences in the retention of valuable HM ingredients, but also because of the high costs associated with the inclusion of the device for generating pressure in the HMB environment. A new solution may be the use of high-pressure milk storage at subzero temperatures, but this hypothesis must be verified.
Capacitance Enhancement by Incorporation of Functionalised Carbon Nanotubes into Poly(3,4-Ethylenedioxythiophene)/Graphene Oxide Composites
- Anita Cymann
- Mirosław Sawczak
- Jacek Ryl
- Ewa Klugmann-Radziemska
- Monika Wilamowska-Zawłocka
2020 Pełny tekst Materials
This paper reports on the role of oxidised carbon nanotubes (oxMWCNTs) present in poly-3,4-ethylenedioxytiophene (PEDOT)/graphene oxide (GOx) composite. The final ternary composites (pEDOT/GOx/oxMWCNTs) are synthesised by an electrodeposition process from the suspension-containing monomer, oxidised carbon nanotubes and graphene oxide. Dissociated functional groups on the surface of graphene oxide play a role of counter-ions for the polymer chains. Detailed physicochemical and electrochemical characterisation of the ternary composites is presented in the paper. The results prove that the presence of oxMWCNTs in the ternary composites doubles the capacitance values compared to the binary ones (450 vs. 270 F cm3 for PEDOT/GOx/oxMWCNTs and PEDOT/GOx, respectively). The amount of carbon nanotubes in the synthesis solution is crucial for physicochemical properties of the composites, their adhesion to the electrode substrate and the electrochemical performance.
Carbon Dioxide Recovery Skid
- Kamil Stasiak
- Paweł Ziółkowski
- Dariusz Mikielewicz
2020 Pełny tekst Progress in Petrochemical Science
In the face of tightening climate regulations, the adoption of carbon dioxide recovery systems is inevitable. Modular process skid units have been widely adopted across the industry. The gas-steam power plant skid unit with the carbon dioxide recovery system was described. The proposed skid module consists of the compact cycle with the oxy-combustion and the carbon dioxide capture skid unit producing pure compressed CO2. The compactness of the suggested skid can be achieved due to a novel small size designs of the wet combustion chamber and the spray-ejector condenser.
Carbon Nanomaterials From Metal-Organic Frameworks: A New Material Horizon for CO2 Reduction
- Xiaoxu Xuan
- Songying Chen
- Shan Zhao
- Joon Yong Yoon
- Grzegorz Boczkaj
- Xun Sun
2020 Pełny tekst Frontiers in Chemistry
The rise of CO2 in the atmosphere, which results in severe climate change and temperature increase, is known as the major reason for greenhouse effect. Reducing CO2 to value-added products is an attractive solution to this severe problem, along with addressing the energy crisis, to which the catalysts being employed are of vital importance. Due to their high porosity and tunable compositions, Metal-Organic Frameworks (MOFs) show great potentials in energy conversion systems. By thermal or chemical treatment methods, the MOFs are easily turned to MOF derived carbon nanomaterials. The much higher conductivity enables MOF derived carbon nanomaterials to be employed in CO2 conversion processes. The present review, discusses the state of the art of MOF derived carbon nanomaterials in CO2 electrochemical, photocatalytic, and thermal reduction applications. The corresponding reaction mechanisms and influence of various factors on catalyst performance are elaborated. Finally, the deficiencies and recommendations are provided for the future progress.
Carboxylation Enhances Fragmentation of Furan upon Resonant Electron Attachment
- Mateusz Zawadzki
- Thomas F. M. Luxford
- Jaroslav Kočišek
2020 Pełny tekst JOURNAL OF PHYSICAL CHEMISTRY A
We report a dissociative electron attachment study to 2-furoic acid (C5H4O3) isolated in a gas phase, which is a model molecule consisting of a carboxylic group and a furan ring. Dissociation of furan by low energy electrons is accessible only via electronic excited Feshbach resonances at energies of incident electrons above 5 eV. On the other hand, carboxylic acids are well- known to dissociate via attachment of electrons at subexcitation energies. Here we elucidate how the electron and proton transfer reactions induced by carboxylation influence stability of the furan ring. Overlap of the furan and carboxyl π orbitals results in transformation of the nondissociative π2 resonance of the furan ring to a dissociative resonance. The interpretation of hydrogen transfer reactions is supported by experimental studies of 3-methyl-2-furoic and 5-methyl-2-furoic acids (C6H6O3) and density functional theory (DFT) calculations.
Cargo ships heat demand - operational experiment
- Damian Bocheński
- Dominik Kreft
2020 Pełny tekst Polish Maritime Research
The paper presents the results of an experiment conducted on two cargo ships – a 5300 TEU container with a steam heating system and a 7500 dwt general cargo ship with a thermal oil system. On both ships research has been carried out using specially designed measuring equipment. After gathering data about flow velocity and temperatures (steam/ cooling water/ thermal oil/ seawater/ outside air), calculations have been done, resulting in histograms. For both types of histograms (heat demand and service time), the probability density function was fitted, using the K-S statistical test. The last step was comparison of the probability distribution mean to seawater and the outside air temperatures by linear regression and the coefficient of determination. The dependencies between the mentioned temperatures and heat demand were noted.
Carnivorous plants used for green synthesis of silver nanoparticles with broad-spectrum antimicrobial activity
- Rafal Banasiuk
- Marta Krychowiak
- Daria Swigon
- Wojciech Tomaszewicz
- Angelika Michalak
- Agnieszka Chylewska
- Magdalena Ziabka
- Marcin Stanisław Łapiński
- Barbara Kościelska
- Magdalena Narajczyk
- Aleksandra Krolicka
- Marta Krychowiak-Maśnicka
2020 Pełny tekst Arabian Journal of Chemistry
In this study, we exploit the anti-oxidative potential of four carnivorous plants to produce uniform and biologically active silver nanoparticles. The use of polyvinylpyrrolidone promoted syn-thesis of quasi-spherical nanoparticles characterized by stability and high uniformity. Their activity was tested against three human pathogens and three species of plant pathogenic bacteria. The study demonstrates the influence of synthesis method (microwave irradiation or heat radiation) and plant extract composition on nanoparticle activity. The total anti-oxidative potential of the plant extract, as well as the applied method of silver ions reduction proved to be crucial for antimicrobial activity. The highest minimal bactericidal concentration (mean value = 10 m g/mL) was obtained for silver nanoparticles synthesized with the use of water extract from Dionaea muscipula tissue.
Carrefour
- Luciano Segreto
2020
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Cascading transitions toward unconventional charge density wave states in the quasi-two-dimensional monophosphate tungsten bronze P4W16O56
- Elen Duverger-Nédellec
- Alain Pautrat
- Kamil Kolincio
- Laurence Hervé
- Olivier Pérez
2020 Pełny tekst IUCrJ
Single crystals of the m = 8 member of the low-dimensional monophosphate tungsten bronzes (PO2)4(WO3)2m family were grown by chemical vapour transport technique and the high crystalline quality obtained allowed a reinvestigation of the physical and structural properties. Resistivity measurements revealed three anomalies at TC1 = 258 K, TC2 = 245 K and TC3 = 140 K, never observed until now. Parallel X-ray diffraction investigations showed a specific signature associated with three structural transitions, i.e. the appearance of different sets of satellite reflections below TC1, TC2 and TC3. Several harmonics of intense satellite reflections were observed, reflecting the non-sinusoidal nature of the structural modulations and a strong electron–phonon coupling in the material. These transitions could be associated with the formation of three successive unconventional charge density wave states.
Cassirer E. .Filozofia form symbolicznych. Część Druga: Myślenie Mityczne.Przekład, wstęp i opracowanie Andrzej Karalus i Przemysław Parszutowicz, Kęty: Wydaw.Marek Derewiecki,2020
- Andrzej Karalus
- Przemysław Parszutowicz
2020
Tłumaczenie ksiązki: Andrzej Karalus i Przemysław Parszutowicz
Catalytic Mechanism of Non-Target DNA Cleavage in CRISPR-Cas9 Revealed by Ab Initio Molecular Dynamics
- Lorenzo Casalino
- Łukasz Nierzwicki
- Martin Jinek
- Giulia Palermo
2020 Pełny tekst ACS Catalysis
CRISPR-Cas9 is a cutting-edge genome editing technology, which uses the endonuclease Cas9 to introduce mutations at desired sites of the genome. This revolutionary tool is promising to treat a myriad of human genetic diseases. Nevertheless, the molecular basis of DNA cleavage, which is a fundamental step for genome editing, has not been established. Here, quantum–classical molecular dynamics (MD) and free energy methods are used to disclose the two-metal-dependent mechanism of phosphodiester bond cleavage in CRISPR-Cas9. Ab initio MD reveals a conformational rearrangement of the Mg2+-bound RuvC active site, which entails the relocation of H983 to act as a general base. Then, the DNA cleavage proceeds through a concerted associative pathway fundamentally assisted by the joint dynamics of the two Mg2+ ions. This clarifies previous controversial experimental evidence, which could not fully establish the catalytic role of the conserved H983 and the metal cluster conformation. The comparison with other two-metal-dependent enzymes supports the identified mechanism and suggests a common catalytic strategy for genome editing and recombination. Overall, the non-target DNA cleavage catalysis described here resolves a fundamental open question in the CRISPR-Cas9 biology and provides valuable insights for improving the catalytic efficiency and the metal-dependent function of the Cas9 enzyme, which are at the basis of the development of genome editing tools.
Cathodic activation of synthesized highly defective monoclinic hydroxyl‐functionalized ZrO2 nanoparticles for efficient electrochemical production of hydrogen in alkaline media
- Nasser Mostafa
- M. Qhtani
- S. Alotaibi
- Z. Zaki
- Sarah Alharthi
- Mateusz Cieślik
- Adrianna Górnicka
- Jacek Ryl
- Rabah Boukherroub
- Mohammed Amin
2020 Pełny tekst INTERNATIONAL JOURNAL OF ENERGY RESEARCH
The high electrochemical stability of Zirconia (ZrO2) at high potentials strongly suggested it as an alternative to carbon supports, which experience reduced efficiency due to some corrosion problems particularly during prolonged electrocatalysis activity. However, the use of ZrO2 was limited by its low electrical conductivity and surface area. In this work, we developed a methodology for synthesizing monoclinic ZrO2 NPs with increased surface area and improved electrical/electrocatalytic characteristics without using any carbon‐based co‐support material or any metallic nanoparticles. In this context, for the first time, highly defective hydroxyl‐functionalized ZrO2 NPs (designated here as ZT NPs) were prepared by a hydrothermal route in the presence of sodium tartrate as a mineralizer. XRD analysis demonstrated that the produced zirconia was semicrystalline microspheres, consisting of monoclinic ZrO2 NPs with high lattice defects. The addition of tartrate ions decreased the crystallite size and increased the defects and microstrain. At the same time, the alkaline hydrogen evolution reaction (HER) catalytic activity of ZrO2 NPs was significantly increased when using sodium tartrate as mineralizer; the overpotential required to obtain 10 mA cm−2 (η10) dropped down from 490 to merely 235 mV, while an exchange current density (jo) increased 12 times to 0.22 mA cm−2. The presence of structural defects (revealed by XRD) and the increased number of active surface sites contending O‐H groups (evidenced from ATR‐FTIR and XPS) as well as the enhanced electrochemical active surface area (confirmed from double‐layer capacitance measurements) were the main reasons behind the high catalytic performance. The ZrO2 NPs catalytic activity increased even further during the long‐term stability tests under severe cathodic conditions (ZT*, ZrO2 NPs obtained after the long‐term stability, has jo = 0.47 mA cm−2 and η10 = 140 mV), approaching the activity of Pt/C catalyst. This process was assisted by mineralizer removal from the catalyst (testified by XPS). Our studies revealed that ZT* are characterized by larger electroactive surface area and more structure defects compared to ZT, where surface area and microstrains resulting from surface hydroxylation open cavities in zirconia structure.
Cellulose Nanofibers Isolated from the Cuscuta Reflexa Plant as a Green Reinforcement of Natural Rubber
- Midhun Dominic C.D.
- Rani Joseph
- P.M. Sabura Begum
- Meera Joseph
- Dileep Padmanabhan
- Leonna Angela Morris
- Athira S Kumar
- Krzysztof Formela
2020 Pełny tekst Polymers
In the present work, we used the steam explosion method for the isolation of cellulose nanofiber (CNF) from Cuscuta reflexa, a parasitic plant commonly seen in Kerala and we evaluated its reinforcing efficiency in natural rubber (NR). Fourier Transform Infrared Spectroscopy (FTIR), X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), and Thermogravimetric analysis (TGA) techniques indicated that type I cellulose nanofibers, with diameter: 10–30 nm and a 67% crystallinity index were obtained by the proposed method. The results showed that application of CNF in NR based nanocomposites resulted in significant improvement of their processing and performance properties. It was observed that the tensile strength and tear strength of NR/CNF nanocomposites are found to be a maximum at 2 phr CNF loading, which corresponds with the studies of equilibrium swelling behavior. Dynamic mechanical analysis, thermogravimetric analysis, and morphological studies of tensile fractured samples also confirm that CNF isolated from Cuscuta reflexa plant can be considered as a promising green reinforcement for rubbers.