2020 - Publications Repository - Gdańsk University of Technology

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Publications from the year 2020

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Pół wieku ochrony architektury modernistycznej Gdyni = Gdynia – half a century of modernist architecture preservaton
- Robert Hirsch
2020
Artykuł przedstawia kolejne etapy wprowadzania ochrony architektury modernistycznej Gdyni oraz realizacje związane z jej konserwacją
Prace doktorskie, habilitacje oraz profesury o tematyce chemii analitycznej i pokrewnej w 2019 r.
- Marek Biziuk
- Żaneta Polkowska
2020 Analityka: Nauka i Praktyka
Zestawiono prace doktorskie, habilitacje oraz profesury o tematyce chemii analitycznej i pokrewnej w 2019 r
Practical Approach to Large-Scale Electronic Structure Calculations in Electrolyte Solutions via Continuum-Embedded Linear-Scaling Density Functional Theory
- Jacek Dziedzic
- Arihant Bhandari
- Lucian Anton
- Chao Peng
- James Womack
- Marjan Famili
- Denis Kramer
- Chris-Kriton Skylaris
2020 Full text Journal of Physical Chemistry C
We present the implementation of a hybrid continuum-atomistic model for including the effects of a surrounding electrolyte in large-scale density functional theory (DFT) calculations within the Order-N Electronic Total Energy Package (ONETEP) linear-scaling DFT code, which allows the simulation of large complex systems such as electrochemical interfaces. The model represents the electrolyte ions as a scalar field and the solvent as a polarizable dielectric continuum, both surrounding the quantum solute. The overall energy expression is a grand canonical functional incorporating the electron kinetic and exchange−correlation energies, the total electrostatic energy, entropy, and chemical potentials of the surrounding electrolyte, osmotic pressure, and the effects of cavitation, dispersion, and repulsion. The DFT calculation is performed fully self-consistently in the electrolyte model, allowing the quantum-mechanical system and the surrounding continuum environment to interact and mutually polarize. A bespoke highly parallel multigrid Poisson−Boltzmann solver library, DL_MG, deals with the electrostatic problem, solving a generalized Poisson−Boltzmann equation. Our model supports open boundary conditions, which allows the treatment of molecules, entire biomolecules, or larger nanoparticle assemblies in the electrolyte. We have also implemented the model for periodic boundary conditions, allowing the treatment of extended systems such as electrode surfaces in contact with the electrolyte. A key feature of the model is the use of solute size and solvation-shell-aware accessibility functions that prevent the unphysical accumulation of electrolyte charge near the quantum solute boundary. The model has a small number of parametershere we demonstrate their calibration against experimental mean activity coefficients. We also present an exemplar simulation of an 1634-atom model of the interface between a graphite anode and LiPF6 electrolyte in an ethylene carbonate solvent. We compare the cases where Li atoms are intercalated at opposite edges of the graphite slab and in solution, demonstrating a potential application of the model in simulations of fundamental processes in Li-ion batteries.
Practical I-Voting on Stellar Blockchain
- Stanisław Barański
- Julian Szymański
- Andrzej Sobecki
- David Gil
- Higinio Mora
2020 Full text Applied Sciences-Basel
In this paper, we propose a privacy-preserving i-voting system based on the public Stellar Blockchain network. We argue that the proposed system satisfies all requirements stated for a robust i-voting system including transparency, verifiability, and voter anonymity. The practical architecture of the system abstracts a voter from blockchain technology used underneath. To keep user privacy, we propose a privacy-first protocol that protects voter anonymity. Additionally, high throughput and low transaction fees allow handling large scale voting at low costs. As a result we built an open-source, cheap, and secure system for i-voting that uses public blockchain, where everyone can participate and verify the election process without the need to trust a central authority. The main contribution to the field is a method based on a blind signature used to construct reliable voting protocol. The proposed method fulfills all requirements defined for i-voting systems, which is challenging to achieve altogether.
Precipitation and Transformation of Vaterite Calcium Carbonate in the Presence of Some Organic Solvents
- Donata Konopacka-Łyskawa
- Natalia Czaplicka
- Marcin Łapiński
- Barbara Kościelska
- Rafał Bray
2020 Full text Materials
In this paper, the production of CaCO3 particles via the carbonation route in the reaction of CaCl2 and CO2, using NH3 as a promoter of CO2 absorption, was studied. The solvents used as the reaction media for CaCO3 precipitation were aqueous solutions of methanol, isopropanol and dimethyl sulfoxide (DMSO), in a concentration range of 0–20% (v/v). It was found that the presence of an organic additive influenced the precipitation rate, the content of vaterite in the obtained product, the morphology and the size of the precipitated CaCO3 particles, as well as the rate of its transformation into calcite. The presence of all added organic solvents reduced the vaterite concentration in the produced CaCO3 both at the end of the reaction and after incubation in the reaction medium for 1 h. However, the transformation of vaterite particles into calcite in the tested solutions was slower when the 4 h and 24 h procedures were compared. The interactions of solvents with calcite and vaterite were compared using HPLC tests. DMSO molecules interacted with vaterite particles the most strongly, while the interaction of isopropanol with this polymorph was the weakest. The opposite effect was observed for interactions with calcite particles, and the affinity decreased in the series: isopropanol, methanol, DMSO.
Predicting cutting power for band sawing process of pine and beech wood dried with the use of four different methods
- Daniel Chuchała
- Tomasz Ochrymiuk
- Kazimierz Orłowski
- Marcin Lackowski
- Piotr Taube
2020 Full text BIORESOURCES
Wood drying is an important stage in the woodworking process. After drying, wood is subject to a re-sawing process, for which a high quality surface, low material loss, and high efficiency are often required. In this paper, forecasted values were presented of cutting power for the re-sawing process of pine and beech wood that were dried with four different methods. Forecasting of cutting power for an industrial band saw machine that works daily in a Polish sawmill was determined. Values of cutting power were forecasted for a full range of feed speeds of the analyzed band saw machine. The achieved results allowed the observation of noticeable changes in the forecasted cutting power for a given sawing process as a function of the wood drying method applied. Significant changes were observed for pine wood, especially between air-dried pine wood and wood dried with warm air-steam mixture, and between pine wood dried in a conventional kiln and with warm air-steam mixture.
Predicting the seismic collapse capacity of adjacent structures prone to pounding
- Farzin Kazemi
- Benyamin Mohebi
- M. Yakhchalian
2020 CANADIAN JOURNAL OF CIVIL ENGINEERING
In crowded cities, many structures are often constructed in a very close vicinity; ‎therefore, during severe earthquakes, pounding phenomenon occurs due to out-of-phase ‎vibrations of adjacent structures. In this study, pounding of adjacent structures is investigated ‎up to the occurrence of total collapse. The novelty of this study is performing incremental ‎dynamic analyses to compute the seismic collapse capacities of both pounding structures in ‎one model and removal of the collapsed structure during analysis‎, and proposing ‎modification ‎factors for modifying median collapse capacity of single structures to consider ‎the effect of pounding, which cannot be considered before design process. The results ‎indicate that pounding may significantly affect median collapse capacities of structures ‎compared with those obtained by neglecting the pounding phenomenon. Therefore, different ‎modification factors ‎are required according to structural characteristics. It is noteworthy that ‎the results of this study were obtained using simplifying assumptions and should not be ‎generalized.‎
Prediction of cast-in-place concrete strength of the extradosed bridge deck based on temperature monitoring and numerical simulations
- Aleksandra Kuryłowicz-Cudowska
- Krzysztof Wilde
- Jacek Chróścielewski
2020 Full text CONSTRUCTION AND BUILDING MATERIALS
The work is devoted to the implementation of a monitoring system for high performance concrete embedded in the span of an extradosed bridge deck using a modified maturity method augmented by numerical simulations conducted by the authors’ FEM code. The paper presents all research stages of bridge construction and considers the conclusions drawn from the results of laboratory tests, field measurements, and numerical calculations. The monitored structure is the largest extradosed bridge in Europe in terms of the span’s length. Due to the considerable size and duration of the investment, it was beneficial to use an alternative method for estimating the compressive strength of concrete based on the maturity function. The bridge sections were investigated in three stages: in summer, autumn, and early spring (in June, September, and March). The monitoring of in-place concrete provided information on the actual temperature of the concrete and its gradients. Based on recorded temperatures and proposed numerical procedures, the actual strength of the cast-in-place concrete and the optimal dates of prestressing were determined. This contributed to shortening the work cycle and speeding up the work schedule.
Preliminary Identification of Quantitative Factors Determining the Duration of Court Proceedings in Commercial Cases
- Przemysław Banasik
- Sylwia Morawska
- Monika Odlanicka-Poczobutt
- Maciej Wolny
2020 Full text European Research Studies Journal
Purpose: The aim of the article was to identify factors that are linear combinations of the variables under scrutiny that affect the duration of court proceedings. Design/Methodology/Approach: This research was conducted on commercial cases, based on the Principal Components Analysis (PCA). The original variables were grouped into factors that are correlated with each other. The Kaiser Criterion (own value >1) was chosen as the main criterion determining the number of factors. The conducted research was subordinated to six phases, largely linked to the data mining scheme (CRISP-DM). Seven variables of a strict numerical nature marked as (vn) were distinguished from the features describing court proceedings. Findings: Based on the analysis, two main quantitative factors characterising the examined cases were identified. The first factor groups the variables:(v4) Number of hearings in the first instance/second instance, (v5) The number of days from the first hearing to the case being settled, (v6) The judgement in the first instance (number of pages), (v7) Volume of files (number of volumes),and the second one:(v1) The court fee paid, (v2) The value of the subject matter of the dispute, (v3) The number of days to the first hearing. Further research will be conducted into the development of relations between the variables in different areas of their variability, particularly with respect to the value of the matter in dispute. Practical Implications: The identified factors can be used at the micro level, in case management by a judge, at the meso level in case management in court, as well as at the macro level the entire justice system. Originality/Value: The study identified factors that affect the efficiency of court proceedings.
Preliminary results from HEDGEHOG REXUS project – A sounding rocket experiment on accelerations, vibrations and heat flow
- Adam Dąbrowski
- Karol Pelzner
- Szymon Krawczuk
- Jacek Goczkowski
- Agnieszka Elwertowska
2020 Full text ACTA ASTRONAUTICA
During flight, a sounding rocket is subject to a unique environment - severe vibrations and substantial heat flux. In order to design payloads, precise measurement of these conditions is required. This paper presents preliminary results from HEDGEHOG REXUS Project, whose scientific goal was to characterise the thermal and dynamic environment of REXUS sounding rockets. For this purpose, two new sensors have been designed - mechanical acceleration amplifier/filter and heat flux measuring device. Both provided interesting data - vibration and heat flux profiles allowed identification of key flight phases and quantitative description of certain phenomena during flight was performed. The experiment validated the sensors and provided heating and vibration profiles. Applicability of results and conclusions for future REXUS launches is discussed in the following paper.
Preparation and characterisation of iron substituted Mn1.7Cu1.3-xFexO4 spinel oxides (x = 0, 0.1, 0.3, 0.5)
- Justyna Ignaczak
- Yevgeniy Naumovich
- Karolina Górnicka
- Jan Jamroz
- Wojciech Wróbel
- Jakub Karczewski
- Ming Chen
- Piotr Jasiński
- Sebastian Molin
2020 Full text JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Spinel oxides with the general formula Mn1.7Cu1.3-xFexO4 (x= 0, 0.1, 0.3, 0.5) were prepared and evaluated in this work for their properties at high temperatures. The effect of partially substituting Cu by Fe has not been studied so far for this group of materials and is thus evaluated in this work. Mn1.7Cu1.3-xFexO4 powders were synthesised by a soft chemistry process and studied in terms of crystallographic phase analysis, electrical conductivity, thermal expansion, and sinterability behaviour. The results show that the Fe content has a significant influence on the phase composition and the resulting properties. Characterisation of the dilatometry and conductivity coupled with XRD phase analysis across a wide temperature range allowed the relations between the materials properties and compositions to be observed. The results indicate that Mn1.7Cu0.8Fe0.5O4 is a promising material for use as a protective coating for interconnects in intermediate temperature Solid Oxide Fuel Cells.
Preparation and Characterization of Defective TiO2. The Effect of the Reaction Environment on Titanium Vacancies Formation
- Zuzanna Bielan
- Szymon Dudziak
- Agnieszka Sulowska
- Daniel Pelczarski
- Jacek Ryl
- Anna Zielińska-Jurek
2020 Full text Materials
Among various methods of improving visible light activity of titanium(IV) oxide, the formation of defects and vacancies (both oxygen and titanium) in the crystal structure of TiO2 is an easy and relatively cheap alternative to improve the photocatalytic activity. In the presented work, visible light active defective TiO2 was obtained by the hydrothermal reaction in the presence of three different oxidizing agents: HIO3, H2O2, and HNO3. Further study on the effect of used oxidant and calcination temperature on the physicochemical and photocatalytic properties of defective TiO2 was performed. Obtained nanostructures were characterized by X-ray diffractometry (XRD), specific surface area (BET) measurements, UV-Vis diffuse reflectance spectroscopy (DR-UV/Vis), photoluminescence spectroscopy (PL), X-ray photoelectron spectroscopy (XPS), and electron paramagnetic resonance (EPR) spectroscopy. Degradation of phenol as a model pollutant was measured in the range of UV-Vis and Vis irradiation, demonstrating a significant increase of photocatalytic activity of defective TiO2 samples above 420 nm, comparing to non-defected TiO2. Correlation of EPR, UV-Vis, PL, and photodegradation results revealed that the optimum concentration of HIO3 to achieve high photocatalytic activity was in the range of 20–50 mol%. Above that dosage, titanium vacancies amount is too high, and the obtained materials’ photoactivity was significantly decreased. Studies on the photocatalytic mechanism using defective TiO2 have also shown that •O2- radical is mainly responsible for pollutant degradation.
Preparation, characterization and antimicrobial activity of polyvinyl alcohol/gum arabic/chitosan composite films incorporated with black pepper essential oil and ginger essential oil
- Augustine Amalraj
- Józef Haponiuk
- Sabu Thomas
- Sreeraj Gopi
2020 INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
In this study, biocomposite films based on polyvinyl alcohol (PVA), gum arabic (GA) and chitosan (CS) incorporated with BPEO and GEO were fabricated by solvent casting method. FTIR, XRD, SEM and DSC were performed with mechanical and antimicrobial properties of PVA/GA/CS films with and without BPEO and GEO. The BPEO and GEO incorporated PVA/GA/CS films were significantly inhibited the growth of Bacillus cereus, Staphylococcus aureus, Escherichia coli and Salmonella typhimurium. The obtained results have demonstrated that both BPEO and GEO incorporated PVA/GA/CS films are promising alternatives to wound dressing and food packaging materials.
Preparation of Hydrogen Electrodes of Solid Oxide Cells by Infiltration: Effects of the Preparation Procedure on the Resulting Microstructure
- Bartosz Hołówko
- Jakub Karczewski
- Sebastian Molin
- Piotr Jasiński
2020 Full text Materials
In this work, the infiltration technique was used to produce hydrogen electrodes for solid oxide cells. Different infiltration methodologies were tested in order to try to shorten the infiltration cycle time. The porous scaffolds used for infiltration were based on highly porous yttria-stabilized zirconia (YSZ) obtained by etching the reduced nickel from the Ni-YSZ cermet in HNO3 acid. The support had a complex structure which included a ~130 µm porous functional layer with small pores and a ~320 µm thick supporting layer with large pores. Infiltrations have been carried out using aqueous nickel nitrate solutions. Various infiltration procedures were used, differing in temperature/time profiles. The results show that slow evaporation is crucial for obtaining a homogeneous material distribution leading to high-quality samples. A longer evaporation time promotes the proper distribution of nickel throughout the porous scaffold. The shortening of the heat treatment procedure leads to blockage of the pores and not-uniform nickel distribution.
Pressure drop and heat transfer during boiling and condensation at subcritical region
- Stanisław Głuch
- Dariusz Mikielewicz
- Michał Pysz
2020
Most of the data presented in the literature relate to saturation temperatures in the range - 20°C to 40°C due to the application in refrigeration technology. There is necessity to extend databases to higher values of saturation temperature due to new applications such as Organic Rankine Cycle and high temperature heat pumps. Only few papers contain data for high reduced pressure for low boiling point liquids. This paper focus on research conducted on boiling and heat transfer for various fluids for increased saturation temperature. With the increase in saturation temperature to and above critical values, reduced pressure increases, the density and viscosity of the vapor phase rises, while the opposite trend is noticed for the liquid phase. These influences directly contribute to velocity increase of liquid phase and reduction of the vapor phase, what results in similar values of the phase velocities. The increase in the reduced temperature also leads to reduction in surface tension, what renders decrease of Bond number and domination of gravitational forces. This paper presents overview of current research and conception of new testing facility.
Pressure in charge. Neglected parameter in hydrothermal synthesis turns out to be crucial for electrochemical properties of ammonium vanadates
- Marta Prześniak-Welenc
- Małgorzata Nadolska
- Andrzej Nowak
- Kamila Sadowska
2020 Full text ELECTROCHIMICA ACTA
Ammonium vanadates are of great interest as they exhibit unusual electrical and sensory properties.(NH4)2V6O16and (NH4)2V10O25$8H2O with various morphology were obtained in the hydrothermalsynthesis under controlled temperature and pressure. It was shown, that the pure (NH4)2V10O25$8H2Owas obtained under 50 bar of initial pressure, whereas lower pressure lead to the mixture of twocompounds. The influence of the pressure was studied for thefirst time, and the results demonstrated itsutmost importance. Moreover, the electrochemical performance of synthesized (NH4)2V10O25$8H2Owasstudied, revealing its excellent behavior as cathode material for Li-ion batteries. To the best of our knowledge, there is no information available on using this structure in such application.
Pre-Treatment of Furniture Waste for Smokeless Charcoal Production
- Paweł Kazimierski
- Paulina Hercel
- Katarzyna Januszewicz
- Dariusz Kardaś
2020 Full text Materials
The aim of this study was to assess the possibility of using furniture waste for smokeless fuel production using the pyrolysis process. Four types of wood-based wastes were used in the pyrolysis process: pine sawdust (PS), chipboard (CB), medium-density fiberboard (MDF), and oriented strand board (OSB). Additionally, the slow and fast types of pyrolysis were compared, where the heating rates were 15 C/min and 100 C/min, respectively. Chemical analyses of the raw materials and the pyrolysis product yields are presented. A significant calorific value rise was observed for the solid pyrolysis products (from approximately 17.5 MJ/kg for raw materials up to approximately 29 MJ/kg for slow pyrolysis products and 31 MJ/kg for fast pyrolysis products). A higher carbon content of char was observed in raw materials (from approximately 48% for raw materials up to approximately 75% for slow pyrolysis products and approximately 82% for fast pyrolysis products) than after the pyrolysis process. This work presents the possibility of utilizing waste furniture material that is mostly composed of wood, but is not commonly used as a substrate for conversion into low-emission fuel. The results prove that the proposed solution produced char characterized by the appropriate properties to be classified as smokeless coal.
Prezentacja działa "Największe słońce widziane z ziemi, dotyka naszej relacji" na 9. Triennale Młodych w Orońsku "Póki my żyjemy"
- Patryk Różycki
2020
Póki my żyjemy Jesteśmy świadomi zmiany na naszej planecie i czujemy się za nią odpowiedzialni. Dopóki tu jesteśmy mamy głos i możemy zmieniać rzeczywistość. Mamy prawo poruszać wszystkie ważne tematy dotyczące tego kim jesteśmy i jak będzie wyglądać nasza przyszłość. Wraz z artystami i artystkami tworzymy wystawę opierająca się na sztuce, która jest zarówno reakcją jak i działaniem wobec tego zwrotu. Nasz świat będzie istniał dopóki istnieje człowiek. Przejęcie odpowiedzialności za nasze działania to nasza szansa. Kuratorka: Marta Czyż Artystki i artyści: Yura Biley, Paweł Błęcki, Diana Grabowska, Bruno Althamer, Tymek Bryndal, Patrycja Cichosz, Adelina Cimochowicz, Jakub Danilewicz, Franciszek Drażba, Emilia Dudziec, Karolina Gardzilewicz, Ewa Goral, Tomek Haładaj, Łukasz Horbów, Aleksandra Jagła, Jakub Jakubowicz, Ida Karkoszka, Karolina Konopka, Agata Lankamer, Julia Łukasiak, Katarzyna Malejka, Paweł Marcinek, Gabriela Matuszewska, Maria Nova, Aleksandra Nowakowska, Kolektyw Łaski, Szymon Popielec, Tomasz Paszkowicz, Patryk Różycki, Aleksandra Sarna, Kuba Stępień, Natalia Sucharek, Kacper Szalecki
Prezentacja instalacji artystycznej "Mam dla Ciebie moje serce" na wystawie zbiorowej „WETWARE: PROLIFERACJA I PRZECZUCIE” w Instytucie Cybernetyki Sztuki
- Patryk Różycki
2020
„WETWARE: PROLIFERACJA I PRZECZUCIE” Marcin Bożek, Marta Branicka, Flora Ćwirko + Jan Maurycy Adamski, Jowan Czerkas, Urszula Dulewicz, Dorota Grubba Thiede + Danuta Ćwirko Godycka, Tomasz Kopcewicz, Marta Koniarska, Maria Krupa, Monika Krygier + Stefan Krygier + Włodzimierz Pietrzyk, Przemysław Kryszk, Ryszard Ługowski, Krzysztof Malec, Anna Malinowska, Andrzej Egon Fietke Miastkowski, Piotr Tadeusz Mosur, Mateusz Pęk, Katarzyna Podpora, Marek Rogulski, Magdalena Rosman, Patryk Różycki, Wojtek Sosnowski, Urszula Śliz, Xenia Uranova, Marcelo Zammenhoff, Sofia Żezmer.
PREZENTOWANIE WYNIKÓW BADAŃ A JAKOŚĆ POMIARÓW
- Piotr Konieczka
2020 Analityka: Nauka i Praktyka
Sposób przedstawiania wyników analiz bardzo często nie odzwierciedla jakości ich otrzymania. Nawet bardzo pobieżna analiza chemicznej literatury naukowej pozwala stwierdzić, że brak jest korelacji pomiędzy starannością otrzymywania wyników (system zapewnienia i kontroli jakości uzyskiwanych wyników) a formą ich prezentacji. W pracy zwrócono uwagę na bardzo często pojawiające się w tym zakresie błędy wraz z ich dyskusją i rozwiązaniami poprawnymi.