2022 - Repozytorium publikacji - Politechnika Gdańska

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Hydrothermal modification of TiO2 nanotubes in water and alkali metal electrolytes (LiNO3, NaNO3, KNO3) – Direct evidence for photocatalytic activity enhancement
- Mariusz Wtulich
- Mariusz Szkoda
- Grzegorz Gajowiec
- Kacper Jurak
- Grzegorz Trykowski
- Anna Lisowska-Oleksiak
2022 Pełny tekst ELECTROCHIMICA ACTA
The influence of hydrothermal annealing (HA) of TiO2 nanotubes (TiO2-NTs) in various baths (H2O, LiNO3, NaNO3, KNO3 performed for 4 h, 24 h, 64 h), on their photocatalytic and photoelectrocatalytic properties, was studied. The use of electrolytes was to enable the monitoring of photoactivity changes as a result of the expected impact on the population of hydroxyl groups on the surface. The assumption turned out to be correct and it was proved that the presence of Li+, Na+ or K+ does not allow achieving the same increases in photoactivity as observed for water. Modified samples exhibit significantly decreased F, P and carbon containing species. The length of the HA annealing time considerably affected the geometry of the nanotubes: eliminated clusters, changing the tilting angle of nanotubes, the wall thickness and inter-nanotube distance. Morphology changes due to HA treatment were associated with the interference phenomenon recorded as maximum in the Vis range. HA treatment in water brings about the most photoactive and photoelectroactive material characterized with minor modification in the optical bandgap and position of the flat bad potential. The optical energy bandgap values for electrodes containing alkali metals were reduced (up to 2.72 eV) and flat-band potential was shifted towards the anodic direction (up to 0.25 V disparity). However, increased activity as photocatalysts in the methylene blue degradation process and higher photocurrent generation was achieved for samples after modification in distilled water than in electrolytes, but these parameters are still better in comparison to unmodified titania nanotubes. Long-term treatment in water and electrolytes reduced threshold potentials for oxygen evolution reaction. The studies confirmed the effectiveness of the hydrothermal method for obtaining better photocatalytic parameters of TiO2-NTs and indicate that the presence of alkali metals is not favourable for maintaining high photocatalytic parameters.
Hyperbranched polyethylenimine functionalized silica/polysulfone nanocomposite membranes for water purification
- Vahid Vatanpour
- Maryam Jouyandeh
- Seyed Soroush Mousavi Khadem
- Mohammad Ganjali
- Hiresh Moradi
- Somayeh Mirsadeghi
- Alireza Badiei
- Amin Esmaeili
- Navid Rabiee
- Sajjad Habibzadeh
- Sasan Nouranian
- Krzysztof Formela
- Mohammad Saeb
2022 CHEMOSPHERE
Hyperbranched polyethyleneimine functionalized silica (PEI-SiO2) nanoparticles with considerable hydrophilicity were synthesized and incorporated into a polysulfone (PSF)/dimethylacetamide (DMA)/polyvinylpyrrolidone (PVP) membrane casting solution in five different ratios to fabricate PEI-SiO2/PSF nanocomposite membranes using nonsolvent-induced phase separation. The hydrophilic PEI-SiO2 nanoparticles were characterized by TEM, FTIR, TGA, and XPS analyses. Morphology, water contact angles, mean pore sizes, overall porosity, tensile strengths, water flux, antifouling and the dye separation performances of the PEI-SiO2/PSF membranes were also studied. The PEI-SiO2 nanoparticles were uniformly dispersed in the PSF-based membranes, where a fall in the water contact angle was observed from 65.4° to 49.7° by addition of 2 wt% nanoparticles. The fouling resistance parameters of the PEI-SiO2/PSF membranes were declined with an increase in the nanoparticle concentration, suggesting the superior hydrophilic nature of the PEI-SiO2 nanoparticles. The permeability of the nanocomposite membranes was increased from 38.5 to 70 L m−2 h−1 bar−1 by incorporation of 2 wt% PEI-SiO2. Finally, improvements were observed in the flux recovery ratio (95.8%), Reactive Green 19 dye rejection (99.6%) and tensile strengths of the PEI-SiO2/PSF membranes over the neat PSF and SiO2/PSF membranes, which were used as controls. The results of this study demonstrate the promising application of PEI-SiO2 nanoparticles in improving the separation and antifouling performances of the PSF membranes for water purification.
Hyperelastic Microcantilever AFM: Efficient Detection Mechanism Based on Principal Parametric Resonance
- Amin Alibakhshi
- Sasan Rahmanian
- Shahriar Dastjerdi
- Mohammad Malikan
- Karami Behrouz
- Bekir Akgöz
- Ömer Civalek
2022 Pełny tekst Nanomaterials
The impetus of writing this paper is to propose an efficient detection mechanism to scan the surface profile of a micro-sample using cantilever-based atomic force microscopy (AFM), operating in non-contact mode. In order to implement this scheme, the principal parametric resonance characteristics of the resonator are employed, benefiting from the bifurcation-based sensing mechanism. It is assumed that the microcantilever is made from a hyperelastic material, providing large deformation under small excitation amplitude. A nonlinear strain energy function is proposed to capture the elastic energy stored in the flexible component of the device. The tip–sample interaction is modeled based on the van der Waals non-contact force. The nonlinear equation governing the AFM’s dynamics is established using the extended Hamilton’s principle, obeying the Euler–Bernoulli beam theory. As a result, the vibration behavior of the system is introduced by a nonlinear equation having a time-dependent boundary condition. To capture the steady-state numerical response of the system, a developed Galerkin method is utilized to discretize the partial differential equation to a set of nonlinear ordinary differential equations (ODE) that are solved by the combination of shooting and arc-length continuation method. The output reveals that while the resonator is set to be operating near twice the fundamental natural frequency, the response amplitude undergoes a significant drop to the trivial stable branch as the sample’s profile experiences depression in the order of the picometer. According to the performed sensitivity analysis, the proposed working principle based on principal parametric resonance is recommended to design AFMs with ultra-high detection resolution for surface profile scanning.
Identification of defected sensors in an array of amperometric gas sensors
- Marta Dmitrzak
- Paweł Kalinowski
- Piotr Jasiński
- Grzegorz Jasiński
2022 Sensor Review
Purpose Amperometric gas sensors are commonly used in air quality monitoring in long-term measurements. Baseline shift of sensor responses and power failure may occur over time, which is an obstacle for reliable operation of the entire system. The purpose of this study is to check the possibility of using PCA method to detect defected samples, identify faulty sensor and correct the responses of the sensor identified as faulty. Design/methodology/approach In this work, the authors present the results obtained with six amperometric sensors. An array of sensors was exposed to sulfur dioxide at the following concentrations: 0 ppm (synthetic air), 50 ppb, 100 ppb, 250 ppb, 500 ppb and 1000 ppb. The damage simulation consisted in adding to the sensor response a value of 0.05 and 0.1 µA and replacing the responses of one of sensors with a constant value of 0 and 0.15 µA. Sensor validity index was used to identify a damaged sensor in the matrix, and its responses were corrected via iteration method. Findings The results show that the methods used in this work can be potentially applied to detect faulty sensor responses. In the case of simulation of damage by baseline shift, it was possible to achieve 100% accuracy in damage detection and identification of the damaged sensor. The method was not very successful in simulating faults by replacing the sensor response with a value of 0 µA, due to the fact that the sensors mostly gave responses close to 0 µA, as long as they did not detect SO2 concentrations below 250 ppb and the failure was treated as a correct response. Originality/value This work was inspired by methods of simulating the most common failures that occurs in amperometric gas sensors. For this purpose, simulations of the baseline shift and faults related to a power failure or a decrease in sensitivity were performed.
Identification of Unstable Reference Points and Estimation of Displacements Using Squared Msplit Estimation
- Marek Zienkiewicz
2022 MEASUREMENT
The article presents a new version of the method for estimating parameters in a split functional model, which enables the determination of displacements of geodetic network points with constrained datum. The main aim of the study is to present theoretical foundations of Msplit CD estimation and its basic properties and possible applications. Particular attention was paid to the efficacy of the method in the context of geodetic network deformation analysis and to the robustness properties of the proposed method. The theoretical considerations were verified by means of two computational tests conducted using the Monte Carlo simulation. The obtained results of methods of estimation parameters in a split functional model were compared with the results of classical method of the least squares estimation. The numerical examples provided in the study indicate the basis properties of Msplit CD estimators being determined.
IEEE Industrial Electronics Society Students and Young Professionals Just After the Pandemic Time [Students and Young Professionals News]
- Marek Jasinski
- Marek Turzyński
- Dmitri Vinnikov
- Andrii Chub
2022 IEEE Industrial Electronics Magazine
Report on IEEE IES Society student activities in year 2022.
IFI16 Impacts Metabolic Reprogramming during Human Cytomegalovirus Infection
- Gloria Griffante
- Weronika Hewelt-Belka
- Camilla Albano
- Francesca Gugliesi
- Selina Pasquero
- Sergio Fernando Castillo Pacheco
- Greta Bajetto
- Paolo Ettore Porporato
- Erica Mina
- Marta Vallino
- Christian Krapp
- Martin Roelsgaard Jakobsen
- John Purdy
- Jens Schneider von Deimling
- Santo Landolfo
- Valentina Dell’Oste
- Matteo Biolatti
2022 Pełny tekst mBio
Cellular lipid metabolism plays a pivotal role in human cytomegalovirus (HCMV) infection, as increased lipogenesis in HCMV-infected cells favors the envelopment of newly synthesized viral particles. As all cells are equipped with restriction factors (RFs) able to exert a protective effect against invading pathogens, we asked whether a similar defense mechanism would also be in place to preserve the metabolic compartment from HCMV infection. Here, we show that gamma interferon (IFN-g)-inducible protein 16 (IFI16), an RF able to block HCMV DNA synthesis, can also counteract HCMV-mediated metabolic reprogramming in infected primary human foreskin fibroblasts (HFFs), thereby limiting virion infectivity. Specifically, we find that IFI16 downregulates the transcriptional activation of the glucose transporter 4 (GLUT4) through cooperation with the carbohydrate-response element-binding protein (ChREBP), thereby reducing HCMV-induced transcription of lipogenic enzymes. The resulting decrease in glucose uptake and consumption leads to diminished lipid synthesis, which ultimately curbs the de novo formation of enveloped viral particles in infected HFFs. Consistently, untargeted lipidomic analysis shows enhanced cholesteryl ester levels in IFI16 KO versus wild-type (WT) HFFs. Overall, our data unveil a new role of IFI16 in the regulation of glucose and lipid metabolism upon HCMV replication and uncover new potential targets for the development of novel antiviral therapies.
IgG Avidity Test as a Tool for Discrimination between Recent and Distant Toxoplasma gondii Infection—Current Status of Studies
- Lucyna Holec-Gąsior
- Karolina Sołowińska
2022 Pełny tekst Antibodies
Toxoplasma gondii, an obligate intracellular protozoan parasite, is the causative agent of one of the most prevalent zoonoses worldwide. T. gondii infection is extremely important from a medical point of view, especially for pregnant women, newborns with congenital infections, and immunocompromised individuals. Thus, an accurate and proper diagnosis of this infection is essential. Among the available diagnostic tests, serology is commonly used. However, traditional serological techniques have certain limitations in evaluating the duration of T. gondii infection, which is problematic, especially for pregnant women. Avidity of T. gondii-specific IgG antibodies seems to be a significant tool for discrimination between recent and distant infections. This article describes the problem of diagnosis of T. gondii infection, with regard to IgG avidity tests. The IgG avidity test is a useful serological indicator of toxoplasmosis, which in many cases can confirm or exclude the active form of the disease. IgG antibodies produced in the recent primary T. gondii infection are of low avidity while IgG antibodies with high avidity are detected in the chronic phase of infection. Furthermore, this paper presents important topics of current research that concern the usage of parasite recombinant antigens that may improve the performance of IgG avidity tests.
Ikony architektury portu w Gdyni-styl i struktura
- Maria Sołtysik
2022
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Imaging polarimeter with high-accuracy measuring principles in crystal optics
- Mykola Shopa
- Serhiy Kobyakov
- Yaroslav Shopa
2022 Pełny tekst OPTO-ELECTRONICS REVIEW
An imaging polarimeter based on the principles of high-accuracy polarimetry well known in crystal optics is proposed. The application of scientific digital cameras for performance light measurements leads to precise data on polarizers quality, i.e., maps of extinction ratio and transmission axis. Processing of numerous images, acquired at various settings in the polarizer-sample-analyser system, allows to determine the two-dimensional distribution of the phase retardation of birefringent plates. Several results of imaging polarimetry experiments on birefringent plates demonstrate the impact of multiple light reflections on the measured phase retardation values. Experimental data for LiNbO3 and SiO2 crystal plates have been presented, demonstrating the capabilities of the proposed type of imaging polarimeter in the crystal optics studies. This technique also allows the measurement of the eigen wave ellipticities, associated with the optical activity of crystals.
Impact and stretching standardized tests as useful tools for assessment of viscoelastic behavior for highly rubberized asphalt binder
- Xiaoxiao Yu
- Weihong Yang
- Lu Zhang
- Krzysztof Formela
- Shifeng Wang
2022 CONSTRUCTION AND BUILDING MATERIALS
Asphalt binder is generally identified as a brittle material at low service temperature or under high-speed load, and the brittleness becomes serious after weathering aging. Improving the toughness of asphalt binder through adding high-content of crumb tire rubber is an efficient method to solve this problem. Devulcanized rubber modified asphalt binder (DRMA) with different contents (15–40%) of devulcanized rubber (DR) were prepared and their conventional physical properties, toughness, rheological properties, and microstructure were characterized by DSR, dynamic mechanical thermal analysis, sol–gel analysis, gel permeation chromatography and optical microscopy. It was found that DRMA with 35% DR content still had a good processing property. According to the results of Charpy impact and stretching tests, the toughness of DRMA measured under dynamic or fast-speed loads dramatically increased with an increase of DR content. Remarkably, the brittle-tough transition of DRMA with approximately 25% DR content was identified. The toughening effect of DR on asphalt binder was explained in terms of the decreased temperature stress, the improved speed of stress dissipation, and the increased fracture energy of DRMA. These findings provided a perspective on the viscoelastic characteristics of DRMA under a dynamic load by simple adaptation of standardized tests dedicated for polymers.
Impact evaluation of a cycling promotion campaign using daily bicycle counters data: The case of Cycling May in Poland
- Beatrice Biondi
- Aleksandra Romanowska
- Krystian Birr
2022 Pełny tekst TRANSPORTATION RESEARCH PART A-POLICY AND PRACTICE
The promotion of active and sustainable transport modes as an alternative to motorised individual transport has become a key policy priority in Europe, to reduce air pollution, road congestion, noise, traffic injuries, and the adverse health outcomes of sedentary lifestyles. Policymakers are implementing a wide range of measures to encourage this shift in attitudes and behaviours. These interventions are most valuable when targeting children and young people, as they weigh in habit formation and result in longer term benefits. More specifically, soft transport policies include measures like informational and educational campaigns, marketing techniques, personalized services and incentives. Among this type of policies, the gamification approach based on a competition mechanism and relative reward is applied to promote cycling behaviour, especially directed towards children. In this study we evaluate the Cycling May policy, a wide campaign aimed at promoting commuting to school by bicycle and implemented in several cities in Poland, and targeting schoolchildren and their families. We apply a quasi-experimental design based on observed daily bicycle counts on bicycle lanes in the targeted city of Gdansk and in a control city, over a three-years period. Estimates from a difference-in-difference panel regression show that the policy generated a 18% average increase in daily bicycle traffic. Despite the positive estimated effect during the intervention, our findings suggest that the behavioural change is not sustained after the intervention ends, consistently with findings from similar research.
Impact of cross-section centers estimation on the accuracy of the Point cloud spatial expansion using robust M-estimation and Monte Carlo simulation
- Paweł Dąbrowski
- Marek Zienkiewicz
2022 MEASUREMENT
The point cloud spatial expansion (PCSE) method creates an alternative form of representing the shape of symmetrical objects and introduces additional descriptive geometric parameters. An important element of the procedure is determining the course of the axis of symmetry of cylindrical objects based on cross-sections of point clouds. Outliers occurring in laser measurements are of great importance in this case. In this study, six robust estimation methods were used to determine the coordinates of the section centers. Accuracy analysis was performed both for data simulated with the Monte Carlo method and the real data. The study showed the advantage of robust methods for the PCSE method over the classical method of least squares estimation.
Impact of low-temperature sintering on the Fe-based amorphous coatings
- Amjad Iqbal Falak
- Ayesha Iqbal
- Ahmed Zubair Jan
- Muhammad Bilal Hafeez
2022 Pełny tekst
Bulk metallic glasses (BMGs) have gained a lot of attention in recent years due to their outstanding properties such as high hardness and excellent wear and corrosion resistance. However, they are restricted in industrial applications due to their extreme brittleness. Iron based amorphous coatings from BMGs are the best solution to use them by overcoming the problem of extreme brittleness. The coatings can be sprayed by various thermal techniques such as flame spraying (FS), high velocity air fuel (HVAF), High velocity oxy fuel (HVOF) spraying process and plasma spray (PS) process. In this study, we have developed iron-based amorphous coating via HVOF and found interesting effect of structural relaxation at low temperature. Iron-based amorphous alloy powder with Fe48Mo14Cr15Y2C15B6 composition was used as the feedstock powder. The coatings sprayed by HVOF the techniques showed compact coatings as observed by the Scanning electron microscopy (SEM) results and amorphous phase was confirmed by the X-ray diffraction analysis at various temperature. Further investigations on the mechanical properties and chemical properties show that low temperature sintering improve the property of coatings.
Impact of Propeller Emergence on Hull, Propeller, Engine, and Fuel Consumption Performance in Regular Head Waves
- Mohammad Ghaemi
- Hamid Zeraatgar
2022 Pełny tekst Polish Maritime Research
In this study, the impact of propeller emergence on the performance of a ship (speed), propeller (thrust, torque, and RPM), a diesel engine (torque and RPM) and fuel consumption are analysed under severe sea conditions. The goal is to describe the variation in the system variables and fuel consumption rather than analysing the motion of the ship or the phenomenon of propeller ventilation in itself. A mathematical model of the hull, propeller, and engine interactions is developed in which the propeller emergence is included. The system parameters are set using model experiments, empirical formulae, and available data for the engine. The dynamic response of the system is examined in regular head waves under submerged and emerged conditions of the propeller. The pulsatility and the extent of variation ystem of hull, propeller, and engine are elaborated using quantitative and qualitative terms and absolute and relative scales. The simulation begins with a ship moving on a straight path, in calm water, with a constant speed for the ship, propeller and engine under steady conditions. The ship then encounters regular head waves with a known time series of the total resistance of the ship in waves. Large motions of the ship create propeller emergence, which in turn reduces the propeller thrust and torque. This study shows that for a specific ship, the mean ship speed, shaft angular velocity, and engine power were slightly reduced in submerged conditions with respect to calm water. We compared the mean values of the variables to those in the emerged condition and found that the shaft angular velocity was almost the same, the ship speed was considerably reduced, and the engine power significantly dropped with respect to calm water. The ratios of the amplitude of fluctuation to the mean (Amp/Mean) for the ship speed and angular velocity of the shaft under both conditions were considerable, while the Amp/Mean for the power delivered by the engine was extremely high. The outcomes of the study show the degree of influence of propeller emergence on these variables. We identify the extent of each change and categorise the variables into three main groups based on the results
Impact of Temperature and Nanoparticle Concentration on Turbulent Forced Convective Heat Transfer of Nanofluids
- Janusz Cieśliński
- Dawid Lubocki
- Slawomir Smolen
2022 Pełny tekst ENERGIES
Theoretical analysis of the influence of nanoparticles and temperature on the average Nusselt (Nu) number and the average heat transfer coefficient (HTC) during the turbulent flow of nanofluid in a horizontal, round tube was carried out. The Nu number is a function of the Reynolds (Re) number and the Prandtl (Pr) number, which in turn are functions of the thermophysical properties of the liquid and the flow conditions. On the other hand, the thermophysical properties of nanoliquids are primarily a function of nanoparticle concentration (NPC) and temperature. Hence, the correct determination of the value of the Nu number, and then the HTC, which is needed for engineering calculations, depends on the accuracy of determining the thermophysical properties of nanofluids. In most cases, the thermophysical properties of the nanofluids are calculated as functions of the corresponding thermophysical properties of the base liquid. Therefore, the accuracy of the calculations of the thermophysical properties of nanofluids is equally determined by the reliable correlations for the base liquids. Therefore, new correlations for the calculation of the thermophysical properties of water have been developed. The results of calculations of the thermophysical properties of the base liquid (water) and the water-Al2O3 nanofluids by use of carefully selected correlations is presented. It was established that even for small concentrations of nanoparticles, a significant intensification of heat transfer using nanofluids as compared to the base liquid is obtained for the tested temperature range.
Impact of the Finite Element Mesh Structure on the Solution Accuracy of a Two-Dimensional Kinematic Wave Equation
- Dariusz Gąsiorowski
2022 Pełny tekst Water
The paper presents the influence of the finite element mesh structure on the accuracy of the numerical solution of a two-dimensional linear kinematic wave equation. This equation was solved using a two-level scheme for time integration and a modified finite element method with triangular elements for space discretization. The accuracy analysis of the applied scheme was performed using a modified equation method for three different uniform triangular meshes with the same resolution, but with a different structure. The modified equation approach based on the Taylor series truncation allowed the numerical diffusivity and dispersivity tensors to be derived, which are directly associated with numerical errors. The derived tensors depend on parameters such as the space and time interval, flow velocity and weighting coefficients. A detailed analysis carried out for the particular values of these parameters enabled an assessment of the numerical errors that may be generated in the solution for the assumed mesh structure. The theoretical analysis was confirmed by using numerical simulations carried out for an arbitrary domain and auxiliary conditions. According to the obtained results, it appeared that it is possible to improve the accuracy of the numerical solution by choosing the proper mesh structure and numerical parameters for the applied algorithm.
Impact of thermal loading into the structural performance of ships: A review
- Krzysztof Wołoszyk
2022 Pełny tekst OCEAN ENGINEERING
The presented study reviews the recent advances done regarding the impact of thermal loading on the structural performance of ships. Firstly, the studies related to the mechanical and thermal properties of typical materials used in shipbuilding are outlined. Secondly, a brief introduction to the heat transfer analysis, Finite Element modelling and thermal stresses is provided. Finally, the review of papers dealing with the structural response of ship hull girder elements subjected to thermal loading is outlined. Two main groups of analyses are highlighted, i.e. structural performance at very low and very high temperatures. In each group, the possible future research needs are identified, and conclusions are drawn.
Impedance Spectra of RC Model as a Result of Testing Pulse Excitation Measurement Method Dataset
- Grzegorz Lentka
2022 Pełny tekst
The dataset titled Impedance spectra of RC model as a result of testing pulse excitation measurement method contains the impedance spectrum of an exemplary test RC model obtained using pulse excitation. The dataset allows presentation of the accuracy of the impedance spectroscopy measuring instrument, which uses the pulse excitation method to shorten the time of the whole spectrum acquisition.
Impedimetric sensing of α-amino acids driven by micro-patterned 1,8-Diazafluoren-9-one into titania- boron- doped maze-like nanocarbons
- Mattia Pierpaoli
- Aneta Lewkowicz
- Bartłomiej Dec
- Małgorzata Nadolska-Dawidowska
- Robert Bogdanowicz
2022 Pełny tekst SENSORS AND ACTUATORS B-CHEMICAL
The development of impedimetric, non-faradaic label-free sensors for the detection of α-amino acids constitutes a trailblazing technology for the fast and inexpensive quantification of such biomarkers. Since α-amino acids, such as glycine and sarcosine, are basic constituents in biological processes, a variation in their concentration may be an indicator of cardiovascular diseases and metabolic disorders or neurological conditions. The unique properties, including maze-like porosity along with excellent electron transfer behavior, make boron-doped carbon nanowalls (BCNW) an ideal transducer for electrochemical sensing. In order to realize a non-faradaic impedimetric sensor for the detection of α-amino acids, 1,8-diazafluoren-9-one (DFO), a fluorophore commonly used in forensic science, was dispersed into Ti-sol precursor and deposited over a BCNW substrate by spin-coating. Data mining tools have been applied to the raw impedimetric data to directly predict the glycine concentration and to support the underlying material-interface interaction. The developed sensor revealed high selectivity and reproducibility toward glycine and other α-amino acids (phenylamine, sarcosine and tryptophan) and no selectivity toward β-alanine, γ-aminobutyric acid or taurine. The application of density-functional theory (DFT) studies supported the higher affinity with the highest adsorption energy for the reaction product of DFO with glycine. A detection limit of 51 nM was found for glycine.