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Analiza mostu kolejowego przez rzekę Martwa Wisła w Gdańsku
PublicationOpracowanie dotyczy konstrukcji nowoprojektowanego mostu kolejowego przez rzekę Martwa Wisła w Gdańsku budowanego w ramach zadania "Projekt poprawy dostępu kolejowego do Portu Gdańsk" (most + dwutorowa linia kolejowa). Celem opracowania jest przeprowadzenie analizy obliczeniowej mostu na podstawie jego charakterystyk dostarczonych przez Zleceniodawcę - Biuro Projektów Budownictwa Komunalnego w Gdańsku w formie projektu architektoniczno-budowlanego....
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Cost-efficient design optimization of compact patch antennas with improved bandwidth
PublicationIn this letter, a surrogate-assisted optimization procedure for fast design of compact patch antennas with enhanced bandwidth is presented. The procedure aims at addressing a fundamental challenge of the design of antenna structures with complex topologies, which is simultaneous adjustment of numerous geometry parameters. The latter is necessary in order to find a truly optimum design and cannot be executed-at the level of high-fidelity...
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The entrepreneurship of host cities of the Olympic Games – Between success and social destruction
PublicationMany publications focus on the deficit nature of the Olympic Games organisation, when considered from the point of view of host cities – organisers of such events. However, does such an event actually affect the region and the host country in a positive way? The presented article aims at the assessment of the organisation of mass sports events, such as the Olympic Games, taking into consideration entrepreneurial activities which...
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Effects of safety barrier life cycle cost factors - identification and analysis
PublicationThe costs borne by road infrastructure authorities for managing and maintaining road devices such as safety barriers may be very high. This has prompted the need for identifying and analysing in detail all factors that influence the costs of safety barriers throughout their service life. To meet that need, the authors used international experience and field data collected under the LifeRoSE project to define the cost structure...
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Oddziaływania taboru na mosty kolejowe przy zmiennych parametrach ruchu
PublicationW pracy poruszono zagadnienia związane z identyfikacją oraz modelowaniem układu dynamicznego most-pojazd ruchomy. Za element szczególnie istotny uznano czynnik obciążający. Opracowano i wdrożono metodykę identyfikacji cech dynamicznych rzeczywistego pojazdu szynowego. Eksperyment badawczy przeprowadzono dla jednostki trakcyjnej EN57, jednak nie ma żadnych ograniczeń w stosowaniu metody dla innego, konwencjonalnego taboru szynowego....
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Geopolitical Perspective of the EU's Post-Pandemic Public Diplomacy Prospects and Challenges
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Separation of post-fermentation glycerol solution by nanofiltration membrane distillation system
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Phytochemical parasite-host relations and interactions: A Cistanche armena case study
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A Surrounding World Knowledge Acquiring by Using a Low-cost Ultrasound Sensors
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Random Forest Based Power Sustainability and Cost Optimization in Smart Grid
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Random forest based power sustainability and cost optimization in smart grid
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Efficient list cost coloring of vertices and/or edges of some sparse graphs
PublicationRozważane jest kolorowanie wierzchołków i krawędzi grafów w modelach klasycznym, totalnym i pseudototalnym z uwzględnieniem dodatkowego ograniczenia w postaci list dostępnych kolorów. Proponujemy wielomianowy algorytm oparty na paradygmacie programowania dynamicznego dla grafów o strukturze drzewa. Wynik ten można uogólnić na grafy o liczbie cyklomatycznej ograniczonej z góry przez dowolnie wybraną stała.
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Badania mostu głównego przez Wisłę w ciągu obwodnicy Płocka
PublicationOpsano zakres, metody pomiarów oraz wyniki badań statycznych i dynamicznych mostu podwieszonego przez Wisłę w ciżgu obwodnicy Płocka. Pomierzone podczas prób wartości ugięć, przemieszczeń oraz odkształceń (naprężeń) okazały się zgodne z wartościami teoretycznymi wyznaczonymi w projekcie i potwierdziły pracę mostu w zakresie sprężystym.
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Effects of Coulomb interaction on the electronic structure and lattice dynamics of the Mott insulatorFe2SiO4spinel
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Post-Isometric Back Squat Performance Enhancement of Squat and Countermovement Jump
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Dihydroxyanthraquinones as stable and cost-effective TiO2 photosensitizers for environmental and biomedical applications
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Spurring the community involvement in planning - lessons from post-socialist cities
PublicationPublic participation and community involvement in planning processes is – in general – not a new topic for contemporary planners. But in many parts of the world – including the post-socialist countries like Poland or Russia – we can still face the lack of understanding of importance of proper community involvement in planning and development processes. Situation in these countries is significantly different from both highly-developed...
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Low-Cost EM-Simulation-Driven Multi-Objective Optimization of Antennas
PublicationA surrogate-based method for efficient multi-objective antenna optimization is presented. Our technique exploits response surface approximation (RSA) model constructed from sampled low-fidelity antenna model (here, obtained through coarse-discretization EM simulation). The RSA model enables fast determination of the best available trade-offs between conflicting design goals. A low-cost RSA model construction is possible through...
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Complixity results on open shop scheduling to minimize total cost of operations
PublicationW pracy zaprezentowano serię rezultatów dotyczących złożoności obliczeniowejproblemu szeregowania w systemie otwartym z kryterium łącznego kosztu opera-cji. W ogólności problem jest NP-trudny nawet w przypadku 1-procesorowym.Dlatego zaprezentowano możliwie wiele przypadków szczególnych, które są wie-lomianowe. Są one funkcją długości operacji i struktury grafu konfliktów po-między zadaniami.
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Retrofit analysis of florida beam-and-post reinforced concreta bridge barriers
PublicationTematem pracy jest analiza przebiegu kolizji drogowych w przypadku najechania rozpędzonego pojazdu na betonową barierę mostową typu "Florida beam-and-post". Przedstawiono podstawy konstruowania modelu obliczeniowego do komputerowej symulacji zderzenia przy wykorzystaniu systemu LS-Dyna. Na podstawie otrzymanych wyników sformułowano zalecenia ewentualnych modyfikacji istniejących barier w celu poprawienia ich własności.
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Konsekwencje sposobu modelowania mostu na przykładzie drogowego wiaduktu sprężonego.
PublicationW ramach projektu próbnego obciążenia nowego wiaduktu sprężonego wykonano obliczenia statyczne rzeczywistej konstrukcji. Rozbieżności pomiędzy założeniami projektowymi a wynikami własnymi, skłoniły do przeprowadzenia analizy wpływu sposobu modelowania przęseł na jego teoretyczne wytężenie. Analizowano cztery modele MES, rusz belkowy, model powłokowo-belkowy, model powłokowo-bryłowy oraz model bryłowy. Rezultaty odniesiono do wyników...
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Evolution of post welded residual stress due multilayer circumferentialweld of tube.
PublicationOpisano sposób wykorzystania polowego efektu Barkhausena do pomiaru rozkładu naprężeń w spawanych rurach. Przedstawiono procedurę kalibracji oraz wyniki pomiaru naprężeń uzyskanych po stopniowym spawaniu rury.
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Buckling and post-buckling behavior of column with central non-linear restraint
PublicationW pracy bada się wyboczenie giętne i zachowanie pokrytyczne ściskanego osiowo pręta z nieliniową sprężystą podporą w środku rozpiętości przęsła. Rozwiązanie problemu wyznaczono za pomocą metody małego parametru. Podano przykład numeryczny wyboczenia i zachowania pokrytycznego swobodnie podpartego pręta z nieliniową sprężytą podporą w środku rozpiętości. Wykazano istotny wpływ nieliniowości podpory na zachowanie pokrytyczne pręta.
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Zmodyfikowany model COST 231 HATY do projektowania systemów dostępnych
PublicationW pracy przedstawiono zagadnienie wyznaczania strat propagacyjnych sygnału radiowego w radiowym łączu dostępowym pracującym w warunkach miejskich. Podano zmodyfikowaną postać modelu COST 231 Haty, opracowaną na podstawie wykonanych obszernych badań eksperymentalno-pomiarowych, przeprowadzonych w dużych aglomeracjach miejskich na terenie całego kraju
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Realizacja projektu wzmocnienia mostu przez rzekę Wisłę w Kiezmarku.
PublicationRemonty istniejących obiektów należą do jednych z trudniejszych zadań stawianych przed projektantem i wykonawcą. Wiedza o rzeczywistym stanie konstrukcji nie zawsze jest dostępna na etapie opracowywania projektu i zazwyczaj pogłębiana jest na etapie realizacji inwestycji. Czasami zdobyte informacje oraz możliwości produkcyjne wykonawcy wpływają na pierwotnie przyjęte założenia projektowe.Referat zawiera opis przykładowych problemów...
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Processing of Biomass Prior to Hydrogen Fermentation and Post-Fermentative Broth Management
PublicationUsing bioconversion and simultaneous value-added product generation requires purifica- tion of the gaseous and the liquid streams before, during, and after the bioconversion process. The effect of diversified process parameters on the efficiency of biohydrogen generation via biological pro- cesses is a broad object of research. Biomass-based raw materials are often applied in investigations regarding biohydrogen generation using...
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Low-Cost Behavioral Modeling of Antennas by Dimensionality Reduction and Domain Confinement
PublicationBehavioral modeling has been rising in importance in modern antenna design. It is primarily employed to diminish the computational cost of procedures involving massive full-wave electromagnetic (EM) simulations. Cheaper alternative offer surrogate models, yet, setting up data-driven surrogates is impeded by, among others, the curse of dimensionality. This article introduces a novel approach to reduced-cost surrogate modeling of...
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Cost-Efficient Optical Fronthaul Architectures for 5G and Future 6G Networks
PublicationFifth-generation and Beyond (5GB) wireless networks have introduced new centralized architectures such as cloud radio access network (CRAN), which necessitate extremely high-capacity low latency Fronthaul (FH). CRAN has many advantageous features in terms of cost reduction, performance enhancement, ease of deployment, and centralization of network management. Nevertheless, designing and deploying a cost-efficient FH is still a...
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Reduced-Cost Microwave Modeling Using Constrained Domains and Dimensionality Reduction
PublicationDevelopment of modern microwave devices largely exploits full-wave electromagnetic (EM) simulations. Yet, simulation-driven design may be problematic due to the incurred CPU expenses. Addressing the high-cost issues stimulated the development of surrogate modeling methods. Among them, data-driven techniques seem to be the most widespread owing to their flexibility and accessibility. Nonetheless, applicability of approximation-based...
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Optimal Design of Transmitarray Antennas via Low-Cost Surrogate Modelling
PublicationOver the recent years, reflectarrays and transmitarrays have been drawing a considerable attention due to their attractive features, including a possibility of realizing high gain and pencil-like radiation patterns without the employment of complex feeding networks. Among the two, transmitarrays seem to be superior over reflectarrays in terms of achieving high radiation efficiency without the feed blockage. Notwithstanding, the...
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Great Resignation and Quiet Quitting as Post-pandemic Dangers to Knowledge Management
PublicationPurpose: COVID-19 pandemic aftermaths include the emergence of new tendencies, such as the Quiet Quitting, and continuation of trends such as the Great Resignation, both of which have multiple knowledge-related impacts on individual, organizational and even national level. The aim of this paper is to show the mechanisms behind the Quiet Quitting and the Great Resignation from individual and organizational perspectives. Understanding...
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(Lost) Pride and Prejudice. Journalistic Identity Negotiation Versus the Automation of Content
PublicationThe objective of our research was to broaden the knowledge regarding the relationship between the work of journalists and their professional identity, and, in particular, to identify the attitudes of this professional group towards algorithmic content creation under conditions of liminality. Previously, the implementation of the technology of algorithmic content creation by media organisations was associated primarily with financial...
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Polaronic and Mott insulating phase of layered magnetic vanadium trihalide VCl3
PublicationTwo-dimensional (2D) van der Waals (vdW) magnetic 3d-transition metal trihalides are a new class of functional materials showing exotic physical properties useful for spintronic and memory storage applications. In this article, we report the synthesis and electromagnetic characterization of single-crystalline vanadium trichloride, VCl 3 , a novel 2D layered vdW Mott insulator, which has a rhombohedral structure (R3, No. 148) at...
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5G/6G optical fronthaul modeling: cost and energy consumption assessment
PublicationIn fifth generation (5G) and the future beyond 5G (6G) radio access networks (RANs), the cost of fronthaul deployment is a main challenge for mobile network operators. Depending on different constraints, there are various solutions to deploy an efficient fronthaul. Fiber-optic-based fronthaul offers long-term support with regard to a rapid increase in capacity demands. When fiber connections, either point-to-point (P2P) or point-to-multipoint...
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Fake News: Possibility of Identification in Post-Truth Media Ecology System
PublicationThe main aim of the article is identification of the attitudes towards the processes of identification and verification of fake news in the environment of digital media. The subject of the research refers to the users’ attitudes towards fake news. As indicated by the research, the attitudes towards fake news are not unambiguous. About 2/3 of the respondents claim that they are not able to distinguish fake news from true information;...
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Phosphorus concentration and availability in raw organic waste and post fermentation products
PublicationThe aim of the study was to determine the mobility of phosphorus forms in raw organic waste and from the solid and liquid fractions of digestate. To achieve the purpose of this study, the components (including livestock manure, agricultural waste, food waste, sewage sludge) and their post fermentation products were considered. Subsequently, the effect of the fermentation process on the mobility of phosphorus forms in post-fermentation fractions...
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Reduced-Cost Constrained Modeling of Microwave and Antenna Components: Recent Advances
PublicationElectromagnetic (EM) simulation models are ubiquitous in the design of microwave and antenna components. EM analysis is reliable but CPU intensive. In particular, multiple simulations entailed by parametric optimization or uncertainty quantification may considerably slow down the design processes. In order to address this problem, it is possible to employ fast metamodels. Here, the popular solution approaches are approximation...
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Estimating the Cost of Cybersecurity Activities with CAsPeA: A Case Study and Comparative Analysis
PublicationContemporary approaches to the estimation of cybersecurity costs in organisations tend to focus on the cost of incidents or technological investments. However, there are other, less transparent costs related to cybersecurity management that need to be properly recognised in order to get a complete picture. These costs are associated with everyday activities and the time spent by employees on cybersecurity-related actions. Such...
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Analiza następstw potencjalnej awarii wanty mostu podwieszonego w Bydgoszczy
PublicationMost Uniwersytecki został zamknięty po siedmiu latach od oddania do użytkowania. Powodem były widoczne gołym okiem objawy znacznego przeciążenia w obrębie zakotwień. Krytyczne elementy konstrukcji mostu zostały wzmocnione i przywrócono go do ruchu. W artykule przedstawiono nieliniowe analizy statyczne i dynamiczne wykonane na modelu MES, prezentujące cztery scenariusze przebiegu zachowania konstrukcji po utracie nośności mocowania...
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Inteligentne rozwiązania z zakresu post-processingu dla drukowanych elementów
PublicationCoraz większe zainteresowanie i wykorzystywanie drukowanych elementów w różnych gałęziach przemysłu wiąże się ze stosowaniem odpowiednich metod ich obróbki wykańczającej tzw. post-processing. Tego typu metody służą zazwyczaj poprawie ogólnego wyglądu wydruków, a także ich właściwości mechanicznych i eksploatacyjnych. Celem niniejszego artykułu jest zaprezentowanie wybranych i nowoczesnych rozwiązań z zakresu post-processingu na...
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The Life Cycle Assessment and Life Cycle Cost in public works contracts
PublicationAn important goal, implemented by EU countries under the Europe 2020 strategy, is sustainable development, which includes supporting economy that effectively uses natural and environmentally friendly resources. Solutions in this area are also promoted in tender proceedings in the area of public procurement. The LCA (Life Cycle Assessment) and LCC (Life Cycle Cost) analysis are indicated as the basis for decision-making by awarding...
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The influence of position of the post or its absence on the performance of the cable barrier system
PublicationRoad safety barriers are used to increase safety in potentially dangerous places on the roads. They are designed and installed on the roads to prevent any vehicle from getting outside the travelled way or from entering the opposite lane of the road. Barriers, which are used on European roads, have to undergo full scale crash tests according to the EN 1317 standards. Nowadays as a supplement to real crash tests, numerical simulations...
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The applicability of low-cost PM10 sensors for atmospheric air quality monitoring
PublicationDescribed in this work are the results of field tests carried out in the Tricity Agglomeration between 01 April 2018 and 30 June 2018 in order to evaluate the usefulness of low-cost PM10 sensors in atmospheric air quality monitoring. The results were juxtaposed with the results obtained using reference methods. The results were validated based on the measurement uncertainty as described in...
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Reinforced Secure Gossiping Against DoS Attacks in Post-Disaster Scenarios
PublicationDuring and after a disaster, the perceived quality of communication networks often becomes remarkably degraded with an increased ratio of packet losses due to physical damages of the networking equipment, disturbance to the radio frequency signals, continuous reconfiguration of the routing tables, or sudden spikes of the network traffic, e.g., caused by the increased user activity in a post-disaster period. Several techniques have...
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Effect of Overloaded Vehicles on Whole Life Cycle Cost of Flexible Pavements
PublicationThe phenomenon of vehicle overloading—illegal exceeding of maximum legal weight of vehicles, is a serious problem both in developing and developed countries around the world. Overloaded vehicles occur less frequently in comparison to properly loaded vehicles but due to their greater potential to cause damage they significantly contribute to distress of pavement structure. As studies show, the number of overloaded vehicles increases...
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A note on polynomial algorithm for cost coloring of bipartite graphs with Δ ≤ 4
PublicationIn the note we consider vertex coloring of a graph in which each color has an associated cost which is incurred each time the color is assigned to a vertex. The cost of coloring is the sum of costs incurred at each vertex. We show that the minimum cost coloring problem for n-vertex bipartite graph of degree ∆≤4 can be solved in O(n^2) time. This extends Jansen’s result [K.Jansen,The optimum cost chromatic partition problem, in:...
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Fake News: Possibility of Identification in Post-Truth Media Ecology System
PublicationInformation comes as basic good which affects social well-being. A modern society and a modern state – its administration, education, culture, national economy and armed forces – cannot function efficiently without a rationally developed field of information. The quality of the functioning of that system depends on a specific feature of information, that is namely: its reliability which makes it possible for us to evaluate accuracy,...
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Miniaturization of ESPAR Antenna Using Low-Cost 3D Printing Process
PublicationIn this paper, the miniaturized electronically steerable parasitic array radiator (ESPAR) antenna is presented. The size reduction was obtained by embedding its active and passive elements in polylactic acid (PLA) plastic material commonly used in low-cost 3D printing. The influence of 3D printing process imperfections on the ESPAR antenna design is investigated and a simple yet effective method to compensate them has been proposed....
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Case study 1.2C: Road infrastructure cost in Poland, Annex to Deliverable D3, Marginal cost case studies for road and rail transport. GRACE. Funded by Sixth Framework Programme.
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OPINIA TECHNICZNA nr 7/PG/mosty Sprawowanie nadzoru naukowo-technicznego podczas opracowywania projektów obiektów hydrotechnicznych, mostowych i drogowych w ramach realizacji przedsięwzięcia pn. „Budowa drogi wodnej łączącej Zalew Wiślany z Zatoka Gdańską” Analiza mostu w Nowakowie po modernizacji schematu statycznego w wyniku uwag NN przedstawionych w opinii nr 5/PG/mosty
PublicationOpinię przygotowano w ramach prowadzonego nadzoru naukowo-technicznego podczas opracowywania projektów obiektów hydrotechnicznych, mostowych i drogowych w ramach realizacji przedsięwzięcia pn. „Budowa drogi wodnej łączącej Zalew Wiślany z Zatoka Gdańską”.