2021 - Repozytorium publikacji - Politechnika Gdańska

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Facet effect of TiO2 nanostructures from TiOF2 and their photocatalytic activity
- Marta Kowalkińska
- Szymon Dudziak
- Jakub Karczewski
- Jacek Ryl
- Grzegorz Trykowski
- Anna Zielińska-Jurek
2021 Pełny tekst CHEMICAL ENGINEERING JOURNAL
In this study, special attention is focused on the design of TiO2 morphology and microstructure in the two-step preparation procedure using TiOF2 as a precursor to study their photodegradation mineralization efficiency. Firstly, TiOF2 was synthesized by a simple solvothermal method using titanium(IV) tetrafluoride, which was further used as a precursor in preparation of anatase 2D nanosheets, octahedral, decahedral, and rectangular prisms shape structures. The as-obtained nanostructures were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Brunauer-Emmett-Teller surface area analysis (BET), X-ray photoelectron spectroscopy (XPS), UV–vis diffuse reflectance spectroscopy and photoluminescence spectroscopy. It was assumed that TiOF2 could be applied as a useful precursor for the preparation of nanostructured TiO2 with defined morphology. Simple controlling of the reaction environment, together with the stabilizing effect of the introduced substrates, resulted in the formation of TiO2 particles with different morphologies and consequently exposed crystal facets. The presence of {001}, {101} and {100} facets influence on their photocatalytic activity but mostly on their mineralization efficiency and the pathway of phenol degradation. From the obtained series, the TiO2 octahedra exposing {101} facets exhibited the highest photoactivity and mineralization efficiency under UV–Vis light irradiation, which decreases as the other facets appear and become more exposed. The obtained results were compared with a computational study on the ∙OH and ∙O2– attack on the phenyl ring. Overall results showed that the surface effects of the photocatalyst could be an influencing factor in both mineralization efficiency and photodegradation products formation.
Fast and reliable knowledge-based design closure of antennas by means of iterative prediction-correction scheme
- Sławomir Kozieł
- Anna Pietrenko-Dąbrowska
2021 Pełny tekst ENGINEERING COMPUTATIONS
A novel framework for expedited antenna optimization with an iterative prediction-correction scheme is proposed. The methodology is comprehensively validated using three real-world antenna structures: narrow-band, dual-band and wideband, optimized under various design scenarios. The keystone of the proposed approach is to reuse designs pre-optimized for various sets of performance specifications and to encode them into metamodels that render good initial designs, as well as an initial estimate of the antenna response sensitivities. Subsequent design refinement is realized using an iterative prediction-correction loop accommodating the discrepancies between the actual and target design specifications. The presented framework is capable of yielding optimized antenna designs at the cost of just a few full-wave electromagnetic simulations. The practical importance of the iterative correction procedure has been corroborated by benchmarking against gradient-only refinement. It has been found that the incorporation of problem-specific knowledge into the optimization framework greatly facilitates parameter adjustment and improves its reliability. The proposed approach can be a viable tool for antenna optimization whenever a certain number of previously obtained designs are available or the designer finds the initial effort of their gathering justifiable by intended re-use of the procedure. The future work will incorporate response features technology for improving the accuracy of the initial approximation of antenna response sensitivities. The proposed optimization framework has been proved to be a viable tool for cost-efficient and reliable antenna optimization. To the knowledge, this approach to antenna optimization goes beyond the capabilities of available methods, especially in terms of efficient utilization of the existing knowledge, thus enabling reliable parameter tuning over broad ranges of both operating conditions and material parameters of the structure of interest.
Fast Approximate String Search for Wikification
- Szymon Olewniczak
- Julian Szymański
2021 Pełny tekst
The paper presents a novel method for fast approximate string search based on neural distance metrics embeddings. Our research is focused primarily on applying the proposed method for entity retrieval in the Wikification process, which is similar to edit distance-based similarity search on the typical dictionary. The proposed method has been compared with symmetric delete spelling correction algorithm and proven to be more efficient for longer stings and higher distance values, which is a typical case in the Wikification task.
Fast Design Closure of Compact Microwave Components by Means of Feature-Based Metamodels
- Anna Pietrenko-Dąbrowska
- Sławomir Kozieł
2021 Pełny tekst Electronics
Precise tuning of geometry parameters is an important consideration in the design of modern microwave passive components. It is mandatory due to limitations of theoretical design methods unable to quantify certain phenomena that are important for the operation and performance of the devices (e.g., strong cross-coupling effects in miniaturized layouts). Consequently, the initial designs obtained using analytical or equivalent network models require further adjustment. For reliability reasons, it has to be conducted using electromagnetic (EM) simulation tools, which entails considerable computational expenses whenever conventional numerical optimization algorithms are employed. Accelerating EM-driven design procedures is therefore highly desirable. This work discusses a surrogate-based algorithm for fast design closure and dimension scaling of miniaturized microwave passives. Our approach involves a small database of previously obtained designs as well as two metamodels, an inverse one, employed to yield a high-quality initial design, and the forward surrogate that provides predictions of the system sensitivities. The second model is constructed at the level of response features, which enables a more accurate gradient estimation and leads to improved reliability and a faster convergence of the optimization process. The presented technique is validated using two compact microstrip couplers and benchmarked against the state-of-the-art warm-start optimization frameworks.
Fast Fading Influence on the Deep Learning-Based LOS and NLOS Identificationin Wireless Body Area Networks
- Krzysztof Cwalina
- Alicja Olejniczak
- Olga Błaszkiewicz
- Piotr Rajchowski
- Jarosław Sadowski
2021
In the article, the fast fading influence on the proposed DL (Deep Learning) approach for LOS (Line-of-Sight) and NLOS (Non-Line-of-Sight) conditions identification in Wireless Body Area Networks is investigated. The research was conducted on the basis of the off-body communication measurements using the developed mobile measurement stand, in an indoor environment for both static and dynamic scenarios. The measurements involved five different people with diverse body parameters. The proposed DL approach allows identifying the LOS and NLOS conditions with efficiency over 99% for selected scenarios, which include the fast fading component.
Fatal N-Ethylhexedrone Intoxication
- Ewa Domagalska
- Laura Banaszkiewicz
- Mateusz Woźniak
- Marzena Kata
- Beata Szpiech
- Michał Kaliszan
2021 Pełny tekst JOURNAL OF ANALYTICAL TOXICOLOGY
N-Ethylhexedrone [2-(ethyloamino)-1-phenylhexan-1-one; α-ethylaminohexanophenone; NEH] is one of the most recent synthetic cathinones that appeared on the illegal market in late 2015. The majority of information concerning the model of consumption of NEH and its impact on the body originates only from self-reports from grey literature websites and drug forums. There are only limited data associated with the concentrations of NEH in blood samples available in the literature. This article presents a case of fatal NEH intoxication and a method for the determination of this substance in whole blood. A 21-year-old man without any diagnosed diseases was admitted to the hospital due to disorientation, aggression and finally loss of consciousness. Hyperthermia (>41°C), tachycardia (>160 beats per minute), tachypnoe (20 breaths per minute), blood pressure (110/60 mmHg) and acute kidney failure were diagnosed. After a few hours of hospitalization, the patient died. A plastic bag with a white powder was found in his underwear. Analysis of the powder by another laboratory revealed cocaine hydrochloride; however, no cocaine or its metabolites were found in the biological material upon testing in our laboratory. Therefore, re-analysis of the powder was performed, and NEH was identified. Liquid-liquid extraction followed by LC-MS-MS analysis were used for the determination of NEH in blood. The validation parameters were as follows: calibration range 1-250 ng/mL, accuracy 106.5-109.9%, precision 3.5-6.3%, recovery 90.1-96.9%, LOD 0.07 ng/mL and LOQ 1 ng/mL. NEH was quantified in the blood at a concentration of 145 ng/mL. Additionally, amphetamine at low concentrations and THC-COOH were detected. Our study provided information on the possible lethal concentration and toxidrome that clinicians can observe for NEH-intoxicated patients and can be helpful during the preparation of toxicology analysis reports for a court of law for proper data.
Fatigue Performance of Double-Layered Asphalt Concrete Beams Reinforced with New Type of Geocomposites
- Piotr Jaskuła
- Dawid Ryś
- Marcin Stienss
- Cezary Szydłowski
- Michał Gołos
- Jacek Kawalec
2021 Pełny tekst Materials
The reinforcement of asphalt layers with geosynthetics has been used for several decades, but proper evaluation of the influence of these materials on pavement fatigue life is still a challenging task. The presented study investigates a novel approach to the reinforcement of asphalt layers using a new type of geogrid composite, in which square or hexagonal polypropylene stiff monolithic paving grid with integral junctions is bonded to polypropylene non-woven paving fabric. The laboratory fatigue tests were performed on large asphalt concrete beams reinforced with the new type of geocomposite. Unreinforced samples were used as reference. Test results were analysed in several aspects, including the standardised approach based on stiffness reduction, but also using energy dissipation. The effect of reinforcement on pavement fatigue life was also estimated. Based on the obtained final results of fatigue life calculations, it can be concluded that the evaluated geogrid composites have an evident positive effect on pavement performance and have a significant potential to extend the overall pavement life, especially in the case of hexagonal grid.
Female entrepreneurship in Kazakhstan
- Krystyna Gomółka
2021
Women constitute the majority of the Kazakh population and, even though they live almost 10 years longer than men on average, they are far less economically active. Less than half of the female population take up employment. Women’s wages are often as much as 30% lower than men’s. The subjective reasons for undertaking economic activity as mentioned by women included: independence from the husband, low earnings of the husband and wish to help the family, lower pay compared to men’s, and opportunities in business. Wishing to encourage women to undertake economic activity, the government of Kazakhstan adopted the Act on gender equality, followed by a programme of intensified efforts for SME development. Women’s entrepreneurship was supported by funds made available as part of financial programmes aimed at women, the most important of which is known as DAMU. In 2009 companies with female managers accounted for 5.17% and in 2019 for 43.26% of all SMEs. The majority of the businesses established by women were in the services, retail and wholesale sectors. Car and motorcycle repair enterprises and other services employed the largest number of workers. The largest number of companies were established in two cities: Almaty and Nur-Sultan. The businesses owned by women were mostly one-person companies.
Feminidad online:¿ ni feminista ni auténtica?
- David Duenas Cid
- Estefanía Jiménez
- Cilia Willem
2021
Mucho se ha escrito sobre internet y sus múltiples y diversos impactos sobre la vida de las personas, la economía, la política o cualquier otro ámbito de la sociedad. Evidentemente, lo relacionado con los modos de expresar las relaciones de género en entornos digitales no ha quedado al margen de esta espiral analítica. De hecho, ha generado una abundante literatura que cubre múltiples subtemas, incluyendo aspectos tan diversos como la sexualización, la violencia de género en las redes sociales, la renovación de las formas del feminismo digital, las diferentes formas de adopción de tecnología según el género o la expresión de roles de género en el mundo gamer. (...).
Ferrofluids based analytical extractions and evaluation of their greenness
- Muhammad Sajid
- Kaja Kalinowska
- Justyna Płotka-Wasylka
2021 JOURNAL OF MOLECULAR LIQUIDS
Ferrofluids are stable dispersions of magnetic nanoparticles in a carrier liquid. They have attracted considerable attention in analytical extractions as they combine fluid-like properties with magnetic character, providing magnetic control over the extraction process. The synthesis of ferrofluids is very straightforward, and it generally involves the preparation of magnetic nanoparticles, their coating, and then mixing in a suitable carrier solvent. This review provides an overview of the synthesis of ferrofluids and some considerations that should be taken into account when synthesizing ferrofluids for analytical extractions. This review also provides insights into the role of coating/composite materials and carrier liquids and how they can contribute toward the extraction of analytes. The applications of ferrofluids-based microextractions have been covered briefly. Finally, the green index of ferrofluids-based analytical methodologies has been evaluated using Eco-Scale, GAPI, and AGREE metrics. The factors that can induce further greenness in such methods have been critically appraised.
Fiber-optic sensors based on microspheres with nanocoatings (Zastosowanie mikrosfer optycznych z cienkowarstwowymi pokryciami w czujnikach światłowodowych)
- Paulina Listewnik
2021 Pełny tekst
Temperature is one of the most important physical quantities. Temperature measurements are used in every field of life, especially electronics, electrical engineering, energy-related fields, including energy source and storage devices. The goal of this dissertation is to design and optimize the microsphere-based fiber-optic sensors construction for measurement of the sensor surrounding medium temperature, including selection of the optical microsphere optimal geometrical parameters and selection of the parameters of the ZnO (zinc oxide) coatings deposited by Atomic Layer Deposition (ALD) method. A comprehensive state of the art about the significance of temperature measurements and measurement methods was performed as well. In the dissertation, the fabrication and the characterization of the designed sensors are described. Experimental results of the measurements validating a proper operation of the sensors are presented. Applications of the microsphere-based fiber-optic sensors, firstly as a device for in situ monitoring of the temperature of the supercapacitors and secondly for investigation of the optical and thermal properties of the few-layer black phosphorus coating was proposed.
Financial Markets and Bankruptcy Systems: Is there a Relationship?
- Sylwia Morawska
- Michał Łukowski
- Kamil Gemra
- Waldemar Rogowski
- Przemysław Banasik
- Błażej Prusak
2021 Pełny tekst European Research Studies Journal
Purpose: Filling the cognitive gap in the theory of ex-post transaction costs, i.e., at the stage of enforcing market transactions by examining the relationship between friendliness/severity of the bankruptcy and restructuring law towards debtors, the level of development of financial markets, the effectiveness of the judicial system and the rate of debt recovery. Design/Methodology/Approach: In the research, the following methods were used: literature review, cluster, and panel analysis. Findings: Based on the research, the existence of a statistical relationship was proven between the effectiveness of bankruptcy systems (measured by the recovery rate) and factors characterizing the level of development of the financial market as well as the severity of bankruptcy law towards debtors and the effectiveness of the judicial system. Practical Implications: Research shows that the development of the financial market, and the debt market, in particular, forces countries to put more emphasis on the effectiveness of judicial systems and to create more stringent bankruptcy laws for debtors (more creditor-friendly). Originality/value: This is the first study of its type. In the next stage of the research, the authors want to additionally include such variables as the type of the legal system (statutory law vs. common law) and its origin, the form of organization of the financial market, and at the same time, the banking system model (the Anglo-Saxon and continental models), the effectiveness of conducted restructuring measures, the level of development of countries.
Finansowanie zadań oświatowych jednostek samorządu terytorialnego
- Alicja Sekuła
- Joanna Nucińska,
2021
Celem monografii jest przedstawienie, analiza i ocena procesu organizacji i finansowania zadań oświatowych w Polsce. W ujęciu szczegółowym w książce skupiono się opisie zasad organizacji i finansowania zadań oświatowych z punktu widzenia samorządu terytorialnego, w tym także zasad finansowania i przekazywania środków publicznych w formie dotacji placówkom prowadzonym przez podmioty inne niż jednostki samorządu terytorialnego. W efekcie wskazano zalety procesu, a także jego mankamenty wraz z możliwościami ich likwidacji bądź minimalizacji wpływu na proces kształcenia uczniów i wychowanków. Zakres przestrzenny przedstawionych w książce badań i analiz obejmuje cały kraj. Na zakres podmiotowy składają się wszystkie jednostki samorządu terytorialnego, tj. stopnia gminnego, powiatowego i wojewódzkiego. Zakres czasowy pracy, co do zasady, obejmuje lata 2012-2019 (część empiryczna). W niektórych przypadkach, zwłaszcza w odniesieniu do zagadnień prawnych, analizy przekraczają podstawowe ramy czasowe. Opis zmian w systemie oświaty i systemie jej finansowania przedstawiono od roku 1990, aby wyeksponować ich mnogość, nietrwałość i niestabilność, jednocześnie nakreślając tło rozwiązań funkcjonujących w badanym okresie. Prowadzone rozważania nawiązują także do aktualnego stanu prawnego. Adekwatnie do obranego celu sporządzono strukturę obejmującą pięć rozdziałów poprzedzonych wstępem i zwieńczonych zakończeniem.
Finite element analysis on failure of reinforced concrete corner in sewage tank under opening bending moment
- Ireneusz Marzec
- Jerzy Bobiński
- Andrzej Tejchman-Konarzewski
- Jakub Schönnagel
2021 ENGINEERING STRUCTURES
W artykule omówiono mechanizm uszkodzenia żelbetowego zbiornika ściekowego w narożniku ściany, który uległ uszkodzeniu podczas próby wypełnienia na skutek nadmiernych przemieszczeń poziomych ścian pod wpływem otwierającego momentu zginającego. Aby wyjaśnić przyczyny awarii, przeprowadzono kompleksowe obliczenia metodą elementów skończonych (MES) żelbetowego zbiornika w warunkach odkształcenia płaskiego. Beton zamodelowano za pomocą sprzężonego modelu konstytutywnego sprężysto-plastycznego z degradacją sztywności. Model został wzbogacony w reżimie osłabienia o charakterystyczną długość mikrostruktury, aby zapewnić obiektywne wyniki siatki. Analizy MES przeprowadzono dla różnych układów zbrojenia na zginanie w narożniku. Skoncentrowano się na ewolucji lokalizacji odkształcenia i wytrzymałości narożników. Omówiono przyczyny awarii zbiornika. Wyniki FE wykazały dużą wrażliwość nośności narożnika ściany zbiornika i lokalizacji odkształcenia na układ zbrojenia na zginanie. Ponadto przeprowadzono analizę numeryczną dwóch eksperymentów laboratoryjnych dotyczących żelbetowych narożników poddanych działaniu otwierających momentów zginających.
Finite-difference time-domain analyses of active cloaking for electrically-large objects
- Tomasz Stefański
- Konstantinos Baskourelos
- Kosmas L. Tsakmakidis
2021 Pełny tekst OPTICS EXPRESS
Invisibility cloaking devices constitute a unique and potentially disruptive technology, but only if they can work over broad bandwidths for electrically-large objects. So far, the only known scheme that allows for broadband scattering cancellation from an electrically-large object is based on an active implementation where electric and magnetic sources are deployed over a surface surrounding the object, but whose ‘switching on’ and other characteristics need to be known (determined) a priori, before the incident wave hits the surface. However, until now, the performance (and potentially surprising) characteristics of these devices have not been thoroughly analysed computationally, ideally directly in the time domain, owing mainly to numerical accuracy issues and the computational overhead associated with simulations of electrically-large objects. Here, on the basis of a finite-difference time-domain (FDTD) method that is combined with a perfect (for FDTD’s discretized space) implementation of the total-field/scattered-field (TFSF) interface, we present detailed, time- and frequency-domain analyses of the performance and characteristics of active cloaking devices. The proposed technique guarantees the isolation between scattered- and total-field regions at the numerical noise level (around −300 dB), thereby also allowing for accurate evaluations of the scattering levels from imperfect (non-ideal) active cloaks. Our results reveal several key features, not pointed out previously, such as the suppression of scattering at certain frequencies even for imperfect (time-delayed) sources on the surface of the active cloak, the broadband suppression of back-scattering even for imperfect sources and insufficiently long predetermination times, but also the sensitivity of the scheme on the accurate switching on of the active sources and on the predetermination times if broadband scattering suppression from all angles is required for the electrically-large object.
FinTech oraz rynek zastosowań technologii blockchain w polskich małych i średnich przedsiębiorstwach
- Adam Marszk
- Krzysztof Piech
2021
Książka jubileuszowa wydana z okazji 50-lecia pracy zawodowej prof. Piotra Dominiaka. Pierwsza część tytułu niniejszej książki - Ekonomia, kultura, wartości - nawiązuje do nazwy cyklicznej, międzynarodowej konferencji, którą prof. Dominiak współorganizował. Te trzy pojęcia wyznaczają szeroki zakres jego zainteresowań naukowych. Druga część tytułu - trzy oblicza roztropności - określa styl pracy jubilata. I według tego klucza podzielona jest zawartość książki. Jej autorami są naukowcy - przyjaciele, współpracownicy i uczniowie prof. Piotra Dominiaka.
First deep eutectic solvent-based (DES) stationary phase for gas chromatography and future perspectives for DES application in separation techniques
- Malwina Momotko
- Justyna Łuczak
- Andrzej Przyjazny
- Grzegorz Boczkaj
2021 Pełny tekst JOURNAL OF CHROMATOGRAPHY A
The paper presents the first application of deep eutectic solvents (DES) as stationary phases for gas chromatography. DES obtained by mixing tetrabutylammonium chloride (TBAC) as a hydrogen bond acceptor (HBA) with heptadecanoic acid being a hydrogen bond donor (HBD) in a mole ratio of HBA:HBD equal to 1:2 was characterized by its ability to separate volatile organic compounds (VOCs). The Rohrschneider – McReynolds constants determined reveal that the synthesized DES is a stationary phase of medium polarity. A detailed retention characteristic was determined for a number of groups of chemical compounds, including aromatic hydrocarbons, alcohols, ketones, sulfides and thiophene derivatives. The synthesized DES was found to have a high selectivity towards alcohols. At the same time, the investigated stationary phase was found to have specific interactions with some analytes. For example, a stronger retention was observed for 1-hexanol and 1-heptanol compared to other alcohols. Retention times of these two alcohols are longer by 191% and 300%, respectively, relative to the expected value based on their boiling point. Such an increased retention is caused by a synergistic effect of various kinds of interactions – the possibility of formation of hydrogen bonds between the DES and the hydroxyl group of alcohols and hydrophobic interactions of alkyl chains of the DES with the alkyl chain of alcohols. The ability to modify properties of DESs by replacement of HBA or HBD with a different chemical compound or by dissolving in DES macromolecular substances makes the proposed stationary phase highly flexible. In addition to using the developed DES in chromatographic techniques, the retention data collected indicate the possibility of its application to other separation techniques, i.e. extractive distillation.
First evaluation of wastewater discharge influence on marine water contamination in the vicinity of Arctowski Station (Maritime Antarctica)
- Małgorzata Szopińska
- Aneta Łuczkiewicz
- Katarzyna Jankowska
- Sylwia Fudala-Książek
- Joanna Potapowicz
- Agnieszka Kalinowska
- Robert Józef Bialik
- Stanisław Chmiel
- Żaneta Polkowska
2021 Pełny tekst SCIENCE OF THE TOTAL ENVIRONMENT
In Antarctica,waste is generatedmainly during scientific research programmes and related logistics. In this study, the impact ofwastewater on the western shore of Admiralty Baywas investigated during austral summer in 2017 and 2019. A range of physicochemical parameters and the presence of selected trace metals, formaldehyde and different groups of surfactants were determined in wastewater coming from Arctowski Station and in nearby coastal waters. The presence of selected trace metals (e.g., Cr: 2.7–4.4 μg/L; Zn: 15.2–37.3 μg/L; and Ni: 0.9–23.3 μg/L) and the sums of cationic (0.3–1.5mg/L), anionic (3.1–1.7 mg/L), and non-ionic (0.6–2.4mg/L) surfactants in wastewater indicated the potential influence of anthropogenic factors on sea water. The determined surfactants are found in many hygiene products that end up in the waste water tank after human use and, if untreated, can be released into surface waters with discharge. In addition, the levels of some trace metals indicate that they cannot come only from natural sources, but are the result of human activity. The reported data show disturbances in the marine environment caused by non-treatedwastewater discharge, e.g. by comparing the obtained results from the values of the no observed effect concentrations (NOECs) on selected Antarctic bioindicators, and provide information for the implementation of proper wastewater treatment at any Antarctic station in the future.
Fiscal decentralization in the European Countries: a cluster analysis approach
- Alicja Sekuła
- Kamila Adamowicz
2021 Pełny tekst
The scope of public authority depend on many factors. One of them is a declaration, usually expressed in the constitution of a given country (Sferlea, 2014, Libman, 2010, Nehmelman, Vetzo, 2016) of the application of the decentralisation principle in the performance of public tasks. Despite this declaration, the structure of the public sector and the tasks carried out at different levels in particular countries are not identical. This also applies to the countries of the European Union, although some issues related to legal order are regulated by treaties. This fact became a premise for undertaking the research presented in this article. Its aim was to compare the extent of fiscal decentralisation in EU countries, creation groups of states with similar levels of decentralization and then identify the characteristics of countries where the level is similar. Data obtained from Eurostat were subjected to statistical analysis – non-hierarchical grouping. For this purpose, the cluster analysis module of the R software was used. Analyse was made for the years 2013-2019 for 27 European countries. United Kingdom was excluded due to not available data in Eurostat for year 2019. Based on clustering, the following conclusions were drawn: the level of decentralization in the EU increases with the size of the country. Small states are centralized. Due to the second tier of government, federal countries are characterized by a small degree of decentralization, regardless of their size. The highest level of decentralization is in the Nordic countries, in Denmark so large that it formed a separate cluster.
Flexomagnetic response of buckled piezomagnetic composite nanoplates
- Mohammad Malikan
- Victor Eremeev
2021 Pełny tekst COMPOSITE STRUCTURES
In this paper, the equation governing the buckling of a magnetic composite plate under the influence of an in-plane one-dimensional magnetic field, assuming the concept of flexomagnetic and considering the resulting flexural force and moment, is investigated for the first time by different analytical boundary conditions. To determine the equation governing the stability of the plate, the nonlocal strain gradient theory has been used by taking into account the classical plate theory. The axial magnetic force, which is originated from the magnetic field, is investigated. After extracting the governing differential equation, the critical buckling load is obtained for different support conditions. The effect of nonlocal parameter, sheet aspect ratio and the effect of one-dimensional magnetic field on critical load are discussed. It was earned that if the nanoplate is rectangular so that the value of aspect ratio is less than one, the flexomagnetic response will be more noticeable.