2022 - Repozytorium publikacji - Politechnika Gdańska

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100– lecie urodzin profesora Romualda Kolmana 1922-2016, patrona Konkursu IKAR JAKOŚCI. Kamienie milowe w dorobku twórcy kwalitologii w Polsce
- Piotr Grudowski
2022 Pełny tekst MAG. Magazyn dla Praktyków
17 czerwca 2022 roku minęła 100. rocznica urodzin śp. profesora dr. hab. inż. Romualda Kolmana, jednego z najczęściej przywoływanych twórców i krzewicieli Polskiej Szkoły Jakości. Jako podwładny i doktorant profesora w ostatnim, przypadającym na lata 90. XX wieku okresie jego pracy na Wydziale Mechanicznym Technologicznym w Politechnice Gdańskiej, miałem tę możliwość i szczęście, że mogłem zapoznać się z praktycznie całym dorobkiem naukowym jego życia. Dlatego też w związku z tą okrągłą rocznicą chciałbym w dużym skrócie przedstawić najważniejsze jego osiągnięcia związane z kwalitologią – wiedzą o jakości, którą pioniersko systematycznie rozwijał i upowszechniał.
2D MXene nanocomposites: electrochemical and biomedical applications
- Marzieh Ramezani Farani
- Behnam Nourmohammadi Khiarak
- Rui Tao
- Zegao Wang
- Sepideh Ahmadi
- Mahnaz Hassanpour
- Mohammad Rabiee
- Mohammad Saeb
- Eder C. Lima
- Navid Rabiee
2022 Environmental Science-Nano
In recent years, key questions about the interaction of 2D MXene nanomaterials in electrochemical and biomedical applications have been raised. Most research has focused on clarifying the exclusive properties of the materials; however, only limited reports have described the biomedical applications of 2D nanomaterials. 2D MXenes are monolayer atomic nanosheets resulting from MAX phase ceramics. The hydrophilic properties, metallic conductivity, stability, and exclusive physiochemical performances make them promising materials for electrochemical and biomedical applications, including CO2 reduction, H2 evolution, energy conversion and storage, supercapacitors, stimuli-responsive drug delivery systems, regenerative medicine, and photothermal cancer therapy. In this review paper, we have provided facile approaches to synthesising MXene and characterization of chemical and physical properties. Their potential applications in medicine, ranging from antibacterial agents to targeted drug delivery, cancer photo/chemotherapy, tissue engineering, and electrochemical applications, have not been comprehensively reviewed and discussed—which encouraged us to come up with this work. We also discuss the most common challenges of utilizing MXene-related materials and areas that can be further developed in the future, with possible struggles and limitations one may face.
3D DEM simulations of fracture in reinforced concrete beams
- Michał Nitka
- Andrzej Tejchman-Konarzewski
2022
Artykuł dotyczy zachowania się belki żelbetowej bez zbrojenia pionowego przy trzypunktowym zginaniu. Belka uległa zniszczeniu wskutek ścinania z powodu obecności nadmiernego zbrojenia podłużnego. Eksperymenty przeprowadzono w skali laboratoryjnej z wykorzystaniem systemu mikro-CT, a następnie odtworzono je w analizach numerycznych stosując metodą elementów dyskretnych 3D (DEM). Zastosowano 4-fazowy model betonu z mezostrukturą, oparty bezpośrednio na obrazach mikro-CT. Uzyskano zadowalającą zgodność między wynikami doświadczalnymi i numerycznymi w odniesieniu do lokalizacji i kierunku krytycznego makropęknięcia.
3D X-ray Micro-CT Analysis of Rebar Corrosion in Reinforced Concrete Subjected to a Chloride-Induced Environment
- Łukasz Skarżyński
- Katarzyna Kibort
- Aleksandra Małachowska
2022 Pełny tekst MOLECULES
The paper presents experimental investigations of the concrete cover protective ability to coun-teract rebar corrosion in reinforced concrete cubes. To study and quantify the consequences of corrosion a reinforced concrete sample was subjected to chloride-induced environment in order to get corroded and combined with un-corroded sample. Chloride-accelerated technique can in-duce a high degree of corrosion within at a controlled time. Moreover, detailed and thorough experimental measurements and analyses of reinforcement loss due to corrosion and its influ-ence on concrete microstructure was studied by means of 3D X-Ray micro-computed tomogra-phy. Whereas rebar outside the concrete was heavily corroded due to chloride-accelerated test, only local surface corrosion products appeared inside the concrete. It turned out, that in spite of accelerated corrosion environment, concrete cover shows protective ability to counteract rein-forcing steel corrosion mechanism. Moreover, bond strength between reinforcement rebar and concrete was not visibly affected since the failure force in pull-out test and failure mechanisms, observed by 3D X-Ray micro-CT, were similar for corroded and un-corroded sample. Failure took place due to presence of radial cracks with the maximum width equal approximately 0,25 mm.
50’ Sail Catamaran with Hybrid Propulsion, Design, Theoretical and Experimental Studies
- Wojciech Litwin
- Daniel Piątek
- Wojciech Leśniewski
- Konrad Marszałkowski
2022 Pełny tekst Polish Maritime Research
The development of modern lithium batteries and propulsion systems now allows the use of complex propulsion systems for vessels of various sizes. As part of the research and implementation project, a parallel hybrid drive system was designed, built and then tested in the laboratory. The experimental studies conducted allowed for the measurements of power, fuel consumption and electric power distribution in various operating modes of the propulsion system. The research proves that in the analysed case, the hybrid parallel system meets the demand for electric energy during a typical cruise scenario, and thus there is no need to install a power generator on the yacht.
A breath of fresh air - social cognitive career theory in studying entrepreneurial intentions
- Magdalena Licznerska
- Paweł Ziemiański
2022 International Journal of Entrepreneurship and Small Business
A pinch of robustness and a pinch of freshness create an interesting story. That is why this study focuses on entrepreneurial intentions from an alternative theoretical perspective in an underexplored context. In this paper, it is argued that social cognitive career theory is relevant to the study of individual entrepreneurial cognition and behaviour, and it offers a solid framework in entrepreneurship research. This paper expands on SCCT’s conceptualisation of environmental determinants, proposing the examination of how a new combination of contextual factors (perceived educational, relational and structural support), entrepreneurial self-efficacy, individual entrepreneurial orientation and negative outcome expectations are related to entrepreneurial intentions. For this exploratory study, a questionnaire completed by a sample of students from Poland, one of the Central and Eastern European countries, was employed. Hierarchical multiple regression analyses revealed support for the role of SCCT variables in predicting entrepreneurial intentions. The results, which offer direct useful indications for further research activities, are presented and discussed.
A brief note on monotonic and fatigue fracture events investigation of thin-walled tubular austenitic steel specimens via fracture surface topography analysis (FRASTA)
- Wojciech Macek
- Dhinakaran Sampath
- Łukasz Pejkowski
- Krzysztof Żak
2022 Pełny tekst ENGINEERING FAILURE ANALYSIS
The main objective of this short communication is to show the fracture progression in each loading case and complement knowledge about fracture mechanisms underpinning the tensile and fatigue performance of thin-walled tubes. For this purpose, the fracture surface topography analysis (FRASTA) method was used in the thin-walled tubular austenitic stainless-steel specimens. Two cases were analyzed: monotonic tension, and uniaxial fully-reversed fatigue. Furthermore, the fractures topographies were quantified through the profiles over their entire surfaces with the support of an optical confocal measurement system. The results showed the usefulness of the FRASTA method in identifying characteristic zones in the cracking process for the analyzed cases and motivates its development for other materials and complex loading cases.
A Case Study on Implementing Agile Techniques and Practices: Rationale, Benefits, Barriers and Business Implications for Hardware Development
- Paweł Weichbroth
2022 Pełny tekst Applied Sciences-Basel
Agile methodologies, along with the corresponding tools and practices, are claimed to facilitate teams in managing their work more effectively and conducting their work more efficiently while fostering the highest quality product within the constraints of the budget. Therefore, the rate of awareness and adoption of Agile frameworks both within and outside the software industry has increased significantly. Yet, the latest studies show that the adoption of Agile techniques and practices are not one-size-fits-all, and highlight the challenges, risks, and limitations regarding numerous domains. In this regard, the state-of-the-art literature provides comprehensive reading. However, in the case of hardware manufacturing, it seems to be sparse and fragmented. To fill this gap, the goal of this study is to analyze and present an in-depth account of the implementation of mix agile-oriented tools and practices. To tackle this goal, a single industry case study was undertaken, based on the primary data obtained through the interview protocol and the secondary data extracted from the project’s documentation. The findings concern three areas. First, the rationale behind the implementation of agile for hardware development is explained. Second, the implemented agile techniques and practices are identified, as well as the supporting tools through which their adoption was successfully undertaken. Third, the areas positively impacted by their application are highlighted with the corresponding evaluation measures deployed; moreover, the barriers to adopting Agile practices encountered, and the benefits gained from particular techniques, are further discussed. The presented findings might be of great importance for both researchers and practitioners who are searching for empirical evidence regarding Agile-oriented implementations. Finally, in terms of both benefits and barriers, business implications for hardware development are formulated. Alongside this, numerous open issues and questions present interesting research avenues that concern, in particular, the effectiveness of collaboration and areas of communication through the lens of agile techniques and practices.
A Circular Waveguide Dual-Mode Filter With Improved Out-of-Band Performance for Satellite Communication Systems
- Michał Baranowski
- Łukasz Balewski
- Adam Lamęcki
- Michał Mrozowski
- Jaione Galdeano
2022 Pełny tekst IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
This letter presents a novel design for a 3-D-printed circular waveguide dual-mode (CWDM) filter with a modified cavity shape. The modification leads to a wide spurious-free stopband, which is highly desirable for channel separation in waveguide contiguous output multiplexers (OMUXs) in satellite communication systems. The new resonant cavity design is a result of applying shape deformation to a basic circular cavity in order to move away and suppress parasitic modes. A fourth-order Ku-band channel filter with two transmission zeros (TZs) is designed, fabricated by additive manufacturing (AM) in one piece and measured. In comparison with the state-of-the-art design of a stepped CWDM filter, an improvement of approximately 35% wider spurious-free range is achieved.
A city is not a tree: a multi-city study on street network and urban life
- Jianxiang Huang
- Yuming Cui
- Haoliang Chang
- Hanna Obracht-Prondzyńska
- Dorota Kamrowska-Załuska
- Lishuai Li
2022 Pełny tekst LANDSCAPE AND URBAN PLANNING
Christopher Alexander, a British-American scholar, differentiated an old (natural) city from a new (planned) one by structure. The former resembles a “semilattice”, or a complex system encompassing many interconnected sub-systems. The latter is shaped in a graph-theoretical “tree”, which lacks the structural complexity as its sub-systems are compartmentalized into a single hierarchy. This structural distinction explains why, or perhaps determines “the patina of life” in old urban districts and the lack of such in new ones. His idea, although widely influential, remains contested for its lack of empirical evidence. Subsequent literature failed to distinguish the structural differences between the old and new cities in systematic ways, nor is his hypothesized structure-life relationship verified with statistical rigor. This study aims to test Alexander’s urban structural theory under a comprehensive research framework. We translated his constructs and premises into a mathematically testable form. Qualities of urban spatial structure, such as “semilattice”, “complex network” and “living structure”, were measured using graph-topological indicators computed for street networks. Urban life was measured using a combination of Twitter activities, Point-Of-Interests, and walking trips at the district level. The structure-life relationship was examined using statistical models, after controlling for urban form and socio-demographic confounders including land use, density, block size, parks, income, age, and demographic groups. This research design was implemented in London, New York, Hong Kong, and Gdansk. Our results support Alexander's early works that an old urban district contains more “semilattice” compared with new ones. This quality can be consistently captured by Meshedness Coefficient, a graph-network indicator for semilattice-shaped street network and a strong predictor for urban life. The same cannot be observed for “complex network” with consistency, while we found no independent associations between “living structure” and life, contrary to existing literature. The study shed light on the hidden relationship between urban spatial structure and behavioral evidence in both the virtual and physical world. We uncovered the British-American predilection of Alexander’s theory, which matched data closely in London and New York, but less so in Hong Kong and Gdansk, suggesting the need for a locally-sensitive approach.
A coarse‐grained approach to NMR ‐data‐assisted modeling of protein structures
- Emilia Lubecka
- Adam Liwo
2022 Pełny tekst JOURNAL OF COMPUTATIONAL CHEMISTRY
The ESCASA algorithm for analytical estimation of proton positions from coarse-grained geometry developed in our recent work has been implemented in modeling protein structures with the highly coarse-grained UNRES model of polypeptide chains (two sites per residue) and nuclear magnetic resonance (NMR) data. A penalty function with the shape of intersecting gorges was applied to treat ambiguous distance restraints, which automatically selects consistent restraints. Hamiltonian replica exchange molecular dynamics was used to carry out the conformational search. The method was tested with both unambiguous and ambiguous restraints producing good-quality models with GDT_TS from 7.4 units higher to 14.4 units lower than those obtained with the CYANA or MELD software for protein-structure determination from NMR data at the all-atom resolution. The method can thus be applied in modeling the structures of flexible proteins, for which extensive conformational search enabled by coarse-graining is more important than high modeling accuracy.
A Compact and Lightweight Microwave Tilt Sensor Based on an SRR-Loaded Microstrip Line
- Ali Karami Horestani
- Zahra Shaterian
- Michał Mrozowski
2022
In this paper, the symmetry property of split ring resonators (SRRs) is exploited to develop a tilt sensor. The sensor is composed of an SRR-loaded microstrip line operating at microwave frequencies. It is shown that the depth of notch in the reflection characteristic of the microstrip is a function of the tilt angle of the SRR. Thus, it can be used for sensing inclination. The sensor benefits from very compact size and light weight. Moreover, it is operated at a single frequency, therefore can be used with a simple power meter as the readout circuit. EM simulations show that the proposed sensor exhibits a good average sensitivity of 1 dB/degree while providing a relatively wide span of 25 degrees.
A compact spline-enhanced monopole antenna for broadband/multi-band and beyond UWB applications
- Michał Czyż
- Jan Olencki
- Adrian Bekasiewicz
2022 Pełny tekst AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
In this work, a compact monopole antenna for broadband/multi-band and beyond ultra- wideband (UWB) communication has been proposed. The structure is based on a spline-enhanced radiator with a broadband feed and a modified ground plane. Rigorous design optimization of the radiator has been performed in a two-stage framework where optimization of the structure with respect to electrical performance is followed by explicit miniaturization using a constrained objective function. Two compact radiators characterized by footprints of 404 mm 2 and 322 mm 2 , as well as frequency ranges from 2.8 GHz to 34.9 GHz and from 2.9 GHz to 33.9 GHz have been designed. Except for a relatively narrow frequency range in Ka band (from 34.9 GHz to 37.8 GHz), the larger structure is capable of operating for up to 80 GHz. Owing to a simple topology, small size and broadband operation, the presented antennas are of potential use in mobile terminals dedicated to support various wireless technologies including Internet of Things, WiFi, or UWB-based localization services. The proposed radiators have been benchmarked against other broadband/beyond UWB antennas from the literature. Electrical and field characteristics of the proposed structures have been confirmed through measurements of the fabricated prototypes.
A Comparative Study of Fuzzy SMC with Adaptive Fuzzy PID for Sensorless Speed Control of Six-Phase Induction Motor
- Lelisa Wogi
- Tadele Ayana
- Marcin Morawiec
- Andrzej Jąderko
2022 Pełny tekst ENERGIES
Multi-phase motors have recently replaced three-phase induction motors in a variety of applications due to the numerous benefits they provide, and the absence of speed sensors promotes induction motors with variable speed drives. Sensorless speed control minimizes unnecessary speed encoder cost, reduces maintenance, and improves the motor drive’s reliability. The performance comparison of the fuzzy sliding mode controller (FSMC) with adaptive fuzzy proportional integral derivative (AFPID) control methods for sensorless speed control of six-phase induction motors was analyzed in this study, and the proposed control system has an advantage for multiphase machines, specifically six-phase induction motors (IMs) in this study, as they are the current active research area for electric vehicles, hybrid electric vehicles, aerospace, ship propulsion, and high-power applications. The speed control of a six-phase induction motor was performed by using an AFPID controller and FSMC. The comparative performance analysis was based on sensorless speed control of the six-phase induction motor. A proportional integral derivative (PID) controller is commonly employed as it is used to eliminate oscillations, but it has several drawbacks, such as taking a long time to decrease the error and stabilize the system at constant speed. The fuzzy type-2 and PID controllers were hybridized so as to obtain the advantages of both to enhance the system performance. Finally, the comparison result revealed that the FSMC preforms significantly better by achieving good tracking performance. The control technique maintains the sliding mode approach’s robustness while providing reduced overshoots with a smooth control action, and the FSMC revealed good dynamic response under load variations when compared to the AFPID controller.
A comparative study of organic pollutants in seawater, sediments and oyster tissues at Hab River Delta, Balochistan coast, Pakistan
- Sadar Aslam
- Malik Wajid Hussain Chan
- Grzegorz Boczkaj
- Ghazala Siddiqui
2022
This chapter is about a Comparative Study of Organic Pollutants in Seawater, Sediments, and Oyster Tissues at Hab River Delta, Balochistan Coast, Pakistan.
A Comparative Study on Methods of Distinction Between Near- and Far-Side Defects as Techniques Used Alongside with the Magnetic Flux Leakage Testing
- Zbigniew Usarek
- Marek Chmielewski
- Leszek Piotrowski
2022 Pełny tekst JOURNAL OF NONDESTRUCTIVE EVALUATION
Results of the finite element analysis show that a far-side defect in a steel plate, with the depth greater by 10% of the plate thickness than a near-side defect, can produce a very similar magnetic flux leakage (MFL) signal. Due to the fact that a measurement of MFL itself can lead to misclassification of a far-side defect as a near-side one, and thus to underestimation of its depth, a comparative study of three complementary magnetic techniques was performed. The following techniques were studied: surface topology air-gap reluctance system (STARS), residual magnetic flux leakage (RMFL) and stray magnetic flux leakage (SMFL). Numerical results showed that in the case of the STARS and SMFL, defect signatures in signals were observed for investigated near-side defects, but not for far-side defects. The signature of the far-side defect in the RMFL was observed, however its peak-to-peak value was only about 8% of the value corresponding to the near-side defect.
A comparative study on the decolorization of Tartrazine, Ponceau 4R, and Coomassie Brilliant Blue using persulfate and hydrogen peroxide based Advanced Oxidation Processes combined with Hydrodynamic Cavitation
- Zahra Askarniya
- Soroush Baradaran
- Shirish H. Sonawane
- Grzegorz Boczkaj
2022 Pełny tekst CHEMICAL ENGINEERING AND PROCESSING
Decolorization of Ponceau 4R, Tartrazine, and Coomassie Brilliant Blue (CBB) was studied using hybrid processes of hydrodynamic cavitation (HC) with potassium persulfate (KPS) and hydrogen peroxide (H2O2). The different properties of these dyes such as hydrophobicity, molecular structures, and molecular weights provided this opportunity to investigate the effects of these factors by comparing the decolorization values of the dyes. Treatment process was optimized in respect to cavitation number, HC inlet pressure, and the concentration of external oxidants. The application of dual oxidation system under cavitation conditions revealed a synergetic effect. Maximum decolorization values of 92.27%, 50.1%, and 42.3% were obtained applying this combined process for CBB, Tartrazine, and Ponceau 4R, respectively. The different values of decolorization of the dyes were explained based on their different properties. The kinetic study led to first order rate constants of 10−3 min−1, 6.4*10−3 min−1, 9.2*10−3 min−1, and 4.16*10−2 min−1 using KPS, H2O2, HC, and HC-KPS-H2O2, respectively. A synergetic coefficient of 2.51 obtained by HC-KPS-H2O2 proved the effectiveness of this combined process. Analysis of cavitation yield efficiency showed an improvement of 98% for the HC-KPS-H2O2 combined process as compared to sole HC treatment process.
A comprehensive overview of software product management challenges
- Olga Springer
- Jakub Miler
2022 Pełny tekst EMPIRICAL SOFTWARE ENGINEERING
The principal focus of software product management is to ensure the economic success of the product, which means to prolong the product life as much as possible with modest expenditures to maximizs profits. Software product managers play an important role in the software development organization while being responsible for the strategy, business case, product roadmap, high-level requirements, product deployment (release-management), and retirement plan. This article explores the problems that affect the software product management process, their perceived frequency and perceived severity. The data were collected by a systematic literature review (5 main databases were analyzed), interviews (10 software product managers from IT companies), and surveys (89 participants). 95 software product management problems assigned nonexclusively to 7 areas were identified. 27 commonly mentioned software product management problems were evaluated for their perceived frequency and perceived severity. The problems perceived as the most frequent are: determining the true value of the product that the customer needs, strategy and priorities change frequently, technical debt, working in silos, and balancing between reactive and proactive work. In total, 95 problems have been identified which have been narrowed down to 27 problems based on their occurrence in at least 3 interviews. These selected problems were prioritized by perceived frequency and perceived severity. Some of the identified problems spanned beyond the software product management process itself, but they all affect the work of software product managers.
A comprehensive review on current and emerging technologies toward the valorization of bio‐based wastes and by products from foods
- Roberto Castro‐Muñoz
- Elsa Díaz‐Montes
- Emilia Gontarek-Castro
- Grzegorz Boczkaj
- Charis M. Galanakis
2022 COMPREHENSIVE REVIEWS IN FOOD SCIENCE AND FOOD SAFETY
Industries in the agro-food sector are the largest generators of waste in the world. Agro-food wastes and by products originate from the natural process of senescence, pretreatment, handling, and manufacturing processes of food and beverage products. Notably, most of the wastes are produced with the transformation of raw materials (such as fruits, vegetables, plants, tubers, cereals, and dairy products) into different processed foods (e.g., jams, sauces, and canned fruits/vegetables), dairy derivatives (e.g., cheese and yogurt), and alcoholic (e.g., wine and beer) and nonalcoholic beverages (e.g., juices and soft drinks). Current research is committed not only to the usage of agro-food wastes and by products as a potential source of high-value bioactive compounds (e.g., phenolic compounds, anthocyanins, and organic acids) but also to the implementation of emerging and innovative technologies that can compete with conventional extraction methods for the efficient extraction of such biomolecules from the residues. Herein, specific valorization technologies, such as membrane-based processes, microwave, ultrasound, pulsed electric-assisted extraction, supercritical/subcritical fluids, and pressurized liquids, have emerged as advanced techniques in extracting various added-value biomolecules, showing multiple advantages (improved extraction yields, reduced process time, and protection to the bioactive properties of the compounds). Hence, this comprehensive review aims to analyze the ongoing research on applying such techniques in valorization protocols. A last-five-year review, together with a featured analysis of the relevant findings in the field, is provided.
A comprehensive study on nonlinear hygro-thermo-mechanical analysis of thick functionally graded porous rotating disk based on two quasi three-dimensional theories
- Shahriar Dastjerdi
- Yaghoub Tadi Beni
- Mohammad Malikan
2022 Pełny tekst MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
In this paper, a highly efficient quasi three-dimensional theory has been used to study the nonlinear hygro-thermo-mechanical bending analysis of very thick functionally graded material (FGM) rotating disk in hygro-thermal environment considering the porosity as a structural defect. Two applied quasi three-dimensional displacement fields are assumed in which the strain along the thickness is not zero unlike most of the other plate theories. By considering the nonlinear strains (von Kármán’s assumptions) the large deformations have also been taken into account in order to obtain more accurate results. Finally, some factors that affect the results have been studied further.