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Throughput-Coverage Characteristics for Soft and Partial Frequency Reuse in the LTE Downlink
PublikacjaThe paper presents results of simulation and evaluation of throughput-coverage characteristics for the OFDMA-based LTE network with Soft Frequency Reuse or Partial Frequency Reuse. Firstly, simulation results of throughput characteristics for a single user connection are presented, which allow the evaluation of the stability and availability of bit rate achieved in different areas of a cell. Secondly, the capacity characteristics...
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Koncepcja, modelowanie i symulacja układu napędowego prototypu samochodu elektrycznego "ELV001"
PublikacjaAbstract: In this paper a conception, modelling and simulation tool for drive system of the prototype electric vehicle ''ELV001'' have been presented. The design and building of this vehicle have been carried out in frame of the project: ''Building a market of electric vehicle and charging infrastructure - fundamentals of energy safety''. The simulation tools are of great assistance to engineers and researchers to reduce product-development...
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Acoustic Processor of the Mine Countermeasure Sonar
PublikacjaThis paper presents the concept of an acoustic processor of the mine countermeasure sonar. Developed at the Department of Marine Electronics Systems, Gdansk University of Technology, the acoustic processor is an element of the MG-89, an underwater acoustic station. The focus of the article is on the modules of the processor. They are responsible for sampling analogue signals and implementing the algorithms controlling the measurement...
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Mobile navigation system for visually impaired users in the urban environment
PublikacjaThis paper describes the prototype version of a mobile application supporting independent movement of theblind. Its objective is to improve the quality of life of visually impaired people, providing them with navigationalassistance in urban areas. The authors present the most important modules of the application. The module forprecise positioning using DGPS data from the ASG-EUPOS network as well as enhancements of positioning...
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Hand gesture recognition supported by fuzzy rules and Kalman filters
PublikacjaThe paper presents a system based on camera and multimediaprojector enabling a user to control computer applications by dynamic hand gestures. Gesture recognition methodology based on representing hand movement trajectory by motion vectors analysed using fuzzy rule-based inference is first given. For effective hand position tracking Kalman filters are employed. The system engineered is developed using J2SE and C++/OpenCV technology....
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Teaching High Performance Computing Using BeesyCluster and Relevant Usage Statistics
PublikacjaThe paper presents motivations and experiences from using the BeesyCluster middleware for teaching high performance computing at the Faculty of Electronics, Telecommunications and Informatics, Gdansk University of Technology. Features of BeesyCluster well suited for conducting courses are discussed including: easy-to-use WWW interface for application development and running hiding queuing systems, publishing applications as services...
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Ergonomics in Polish outpatient clinics
PublikacjaOutpatient clinics are structures In which ergonomics play a key role. This fact is associated with an often occurring risk of developing hospital-acquired infection. The risk increases with mistakes made in wrong planning the functional and spatial lay-out is subordinated to high utilitarian requirements, including hygienic and sanitary, and technological requirements. A properly planned structure allows to reduce dangers more...
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Development and tuning of irregular divide-and-conquer applications in DAMPVM/DAC
PublikacjaThis work presents implementations and tuning experiences with parallel irregular applications developed using the object oriented framework DAM-PVM/DAC. It is implemented on top of DAMPVM and provides automatic partitioning of irregular divide-and-conquer (DAC) applications at runtime and dynamic mapping to processors taking into account their speeds and even loads by other user processes. New implementations of parallel applications...
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EASY ACCESS TOOL FOR SMALL INTERFERING RNA (siRNA) DATA
PublikacjaFor many decades it was an accepted dogma of molecular genetics that the expression of genes is a “one-way-road” leading only in one direction from DNA to RNA to proteins. Recent discoveries in modern molecular genetics have challenged this dogma showing that specific RNA molecules play a central role in controlling the activity of genes by changing the structure of DNA sequences, targeting other RNAs for degradation or blocking...
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Primary degradation of antidiabetic drugs
PublikacjaType 2 diabetes is a chronic disease affecting a large portion of the world population and is treated by orally administered drugs. Since these drugs are often taken in high doses and are excreted unchanged or partially metabolised many of them are nowadays detected in surface waters or wastewater treatment plants effluents. Unmetabolised antidiabetics or some of their transformation products retain their pharmacological activity,...
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Structural and dynamic insights on the EmrE protein with TPP+ and related substrates through molecular dynamics simulations
PublikacjaEmrE is a bacterial transporter protein that forms an anti-parallel homodimer with four transmembrane helices in each monomer. EmrE transports positively charged aromatic compounds, such as TPP+ and its derivatives. We performed molecular dynamics (MD) simulations of EmrE in complex with TPP+, MeTPP+, and MBTPP+ embedded in a membrane. The detailed molecular properties and interactions were analysed for all EmrE-ligand complexes....
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Heptaene macrolides biosynthesis by Streptomyces species
PublikacjaPolyene macrolides are one of the groups of secondary metabolites, generated by microorganisms belonging to the Streptomyces genus. These compounds, containing 3 - 7 conjugated double bonds systems in their molecules exhibit high antifungal activity against a broad spectrum of fungal pathogens with heptaenes demonstrating the highest antifungal potential. At the large extent, efficiency of biosynthesis of these natural products...
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Resistance of Escherichia coli and Enterococcus spp. to selected antimicrobial agents present in municipal
PublikacjaIn this study, the susceptibility to erythromycin (E) and to trimethoprim/sulfamethoxazole (SXT) among isolates of Enterococcus spp. and Escherichia coli was tested, respectively. Both fecal indicators were detected and isolated from raw(RW) and treated wastewater (TW) as well as from samples of activated sludge (AS) collected in a local wastewater treatment plant (WWTP). Biodiversity of bacterial community in AS was also monitored...
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Koncept ekologicznie przyjaznego masowca „Gary Muwalt” napędzanego siłą wiatru
PublikacjaW artykule przeanalizowano możliwości, jakie niesie wykorzystanie siły wiatru we współczesnym transporcie morskim na przykładzie ekologicznego masowca z napędem żaglowym. W tym celu dokonano analiz oporowych przy użyciu metod CFD oraz analizy ekonomicznej na podstawie danych rynkowych. Jest to wstęp do dalszych prac, mających na celu stworzenie nowoczesnej jednostki ograniczającej emisję szkodliwych substancji do atmosfery oraz...
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Mechanism of the Reaction of Amines with 5-[(Aryl- or Alkylamino)hydroxymethylene]-2,2-dimethyl-1,3-dioxane-4,6-diones in the Presence of Chlorotrimethylsilane (Me3SiCl);
PublikacjaAddition of chlorotrimethylsilane (Me3SiCl) to the mixture of a carbamoyl‐substituted Meldrum's acid, i.e., a 5‐[(arylamino)hydroxymethylene]‐2,2‐dimethyl‐1,3‐dioxane‐4,6‐dione of type 1 and a secondary amine as nucleophile strongly accelerated the rate of their reaction. The reason for this phenomenon observed, during our previous research, remained, however, unclear. To elucidate the mechanism of this reaction, we assumed and...
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Impedance spectroscopy as a diagnostic tool of degradation of Solid Oxide Fuel Cells = Spektroskopia impedancyjna jako narzędzie diagnostyczne degradacji tlenkowych ogniw paliwowych
PublikacjaTlenkowe ogniwa paliwowe SOFC sa obecnie bliskie komercjalizacji. Wiedza na temat mechanizmów degradacji ogniw paliwowych jest niezbędna do dalszej poprawy ich działania. Spektroskopia impedancyjna jest skutecznym narzędziem diagnostycznym. Pozwala ona na wskazanie który element ogniwa SOFC ulega pogorszeniu oraz pozwala poznać dokładniej naturę procesu degradacji. W tej pracy degradacja ogniwa SOFC została zbadana przy użyciu...
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Określenie zawartości lotnych kwasów tłuszczowych (LKT) w odciekach pochodzących z mikrobiologicznej degradacji monosacharydów
PublikacjaOkreślenie zawartości lotnych kwasów tłuszczowych (LKT) w odciekach pochodzących z mikrobiologicznej degradacji monosacharydów. Milena Jabłońska, Maria Rybarczyk, Marta Wisielewska, Marek Lieder Politechnika Gdańska, Wydział Chemiczny, Katedra Technologii Chemicznej Zawartość lotnych kwasów tłuszczowych (LKT) w metabolitach pochodzących z mikrobiologicznego ogniwa paliwowego (MFC – Microbial Fuel Cell) świadczy o rozkładzie...
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The Interaction of Heptakis (2,6-di-O-Methyl)-β-Cyclodextrin with Mianserin Hydrochloride and Its Influence on the Drug Toxicity
PublikacjaOne tetracyclic antidepressant, mianserin hydrochloride (MIA), has quite significant side effects on a patients’ health. Cyclodextrins, which are most commonly used to reduce the undesirable features of contained drugs within their hydrophobic interior, also have the potential to alter the toxic behavior of the drug. The present paper contains investigations and the characteristics of interaction mechanisms for MIA and the heptakis...
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The reliability of tree and star networks
PublikacjaThis paper investigated the reliability of tree and star networks. Following measures of network reliability are assumed: the expected number of nodes, that can communicate with the central node; the expected number of node pairs, that are connected by a path through the central node; the expected number of node pairs communicating.
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Techniki śródoperacyjnego monitorowania EKG
PublikacjaZ badania EKG lekarze uzyskują szereg cennych informacji niezbędnych do prawidłowego podejmowanie ważnych decyzji terapeutycznych. EKG stało się pierwszym parametrem monitorowanym standardowo i w sposób ciągły podczas znieczulenia. Współczesna technika umożliwia nie tylko ciągłe monitorowanie zapisu EKG, a także transmisję danych on-line do dowolnego miejsca w szpitalu, i ich cyfrową rejestrację. Najistotniejszym kryterium przydatności...
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Potassium trimethylsilanolate-mediated conversion of dialkyl phosphonates to their anhydrous potassium monoalkyl phosphonates under mild, non-aqueous conditions
PublikacjaPrzedstawiona została metoda syntezy bezwodnych soli potasowych fosfonianów monoalkilu z odpowiednich fosfonianów dialkilu w reakcji z trimetylosilanolanem potasu w bezwodnym eterze i chlorku metylenu. Metoda ta może być również stosowana dla makrocyklicznych kaliks[4]arenów z wbudowanymi grupami fosfonowymi na górnej obręczy; preferowanym rozpuszczalnikiem jest w tym przypadku bezwodny THF. Zaletą opisanej metody są łagodne warunki...
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Survey on opportunities and barriers in lighting controls
PublikacjaThis report summarizes a survey performed in eight countries on the status quo of daylight and electric lighting control systems. Feedback from more than 100 international experts (building / facility managers and planers) was evaluated. The aim of the survey was to identify the perception of the different possibilities of the current lighting control solutions and the expectations about the control systems. The survey aims to...
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Framework for gamification of specialized subjects within engineering studies
PublikacjaGamification is a relatively new term forged along with the occurrence of new information technology, especially easy access to internet and smartphones. Gamification is a use of game mechanics, to modify the behavior of people in non-games situations to increase the involvement of individuals. The method is based on the pleasure that comes from overcoming the obstacles to reach next achievable level, which consists of challenges,...
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DATA INTEROPERABILITY AND THE OPEN DATA ECOSYSTEM: ROLES AND RESEARCH AREAS
PublikacjaSustainability and value-creation are considered important parameters to measure the success of an open data system. Unfortunately, existing open data systems are not meeting their promises to achieve a sustainable and value-based open data system. Van Loenen et al. (2021) proposed a sustainable and value-creating open data ecosystem. According to their study, the open data ecosystem needs to be user-driven, inclusive, circular,...
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Modeling the Structure, Dynamics, and Transformations of Proteins with the UNRES Force Field
PublikacjaThe physics-based united-residue (UNRES) model of proteins ( www.unres.pl ) has been designed to carry out large-scale simulations of protein folding. The force field has been derived and parameterized based on the principles of statistical-mechanics, which makes it independent of structural databases and applicable to treat nonstandard situations such as, proteins that contain D-amino-acid residues. Powered by Langevin dynamics...
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Yields and Time-of-Flight Spectra of Neutral High-Rydberg Fragments at the K Edges of the CO2 Molecule
PublikacjaWe have studied the production of neutral fragments in high-Rydberg (HR) states at the C 1s and O 1s edges of the CO2 molecule by performing two kinds of experiments. First, the yields of neutral HR fragments were measured indirectly by ionizing such fragments in a static electric field and by collecting resulting singly charged positive ions as a function of the photon energy. Such measurements reveal not only excitations below...
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PRZYCZEPY DO BADANIA OPORU TOCZENIA OPON DO SAMOCHODÓW OSOBOWYCH
PublikacjaPrzedstawiono doświadczenia Zespołu Pojazdów Katedry Konstrukcji Maszyn i Pojazdów Wydziału Mechanicznego Politechniki Gdańskiej dotyczące urządzeń badawczych (przyczep) do pomiaru oporu toczenia opon do samochodów osobowych i nawierzchni drogowych. Opisano przyczepy pomiarowe tego typu. Pomiary oporu toczenia opon samochodowych wymuszane są koniecznością osiągania przez pojazd jak największej swojej sprawności...
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State of the art and prospects of methods for determination of lipophilicity of chemical compounds
PublikacjaLipophilicity of the compounds is useful to (i) explain their distribution in biological systems, which is different in plant and in animal organisms, (ii) predict the possible pathways of pollutant transport in the environment, and (iii) support drug discovery process and select optimal composition in terms of bioactivity and bioavailability. The lipophilic properties can be determined by two main approaches, experimental, which...
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PROBLEMATYKA WYZNACZANIA WARTOŚCI OPAŁOWEJ MODYFIKOWANYCH PALIW ŻEGLUGOWYCH
PublikacjaW artykule przedstawiono krótką charakterystykę modyfikowanych paliw żeglugowych wprowadzanych na rynek przez koncerny paliwowe PKN ORLEN S.A., LOTOS Asfalt Sp. z o.o. oraz STENA OIL (Szwecja) oraz ich podstawowe własności fizykochemiczne. Zwrócono szczególną uwagę na odpowiedni dobór lepkości paliwa zasilającego silnik okrętowy, który determinuje właściwy przebieg procesu spalania oraz odpowiednie warunki smarowania par precyzyjnych...
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Analiza możliwości usprawnienia organizacji przewozów kurierskich o zróżnicowanym zasięgu przestrzennym na przykładzie powiatu nidzickiego
PublikacjaW artykule przedstawiono możliwości poprawy efektywności przewozów kurierskich na przykładzie danych pochodzących z firmy Siódemka S.A, dotyczących obsługi powiatu nidzickiego. Uzyskane wyniki wskazują na możliwości osiągnięcia wymiernych efektów w postaci redukcji przebytego przez kuriera dystansu, co przekłada się na oszczędności w postaci niższego zużycia paliwa oraz oszczędności czasowych. Problemem jest możliwość praktycznego...
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Cloning, expression, purification and characterization of recombinant trehalose synthase from Deinococcus radiodurans.
PublikacjaTrehalose (α-D-glucopyranosyl-1,1-α-D-glucopyranoside) is a nonreducing disacharide in which the two glucose molecules are linked trough a α-1,1-glycosidic bond. Trehalose is readily hydrolyzed to glucose and can be used as a reserve of that sugar in the cell. The presence of trehalose was found in the cells of fungi and yeasts, bacteria, nematodes, insects, eggs, pupae and some plants. The characteristics of trehalose make it...
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Energetyczne wykorzystanie biomasy
PublikacjaW artykule przedstawiono energetyczne wykorzystanie biomasy jako alternatywy dla paliwa pierwotnego. Szczególną uwagę poświecono rodzajom, właściwościom i sposobom przygotowania biomasy do procesu spalania.Spalanie stanowi najstarszy sposób pozyskiwania energii z biomasy,jednak ze względu na technologiczno-ekonomiczne aspekty częściej wykorzystywany jest proces współspalania. Wzrost proekologicznej świadomości i rozwój lokalnego...
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Photoconversion of carbon dioxide to methane and light hydrocarbons
PublikacjaFotokonwersja ditlenku węgla do lekkich węglowodorów jest czystym i przyjaznym dla środowiska procesem, pozwalającym na obniżenie emisji CO2 przy jednoczesnym generowaniu paliwa. Badanie efektywności procesu fotokonwersji CO2 prowadzono w obecności promieniowania UV-Vis, pary wodnej oraz fotokatalizatorów Ag-TiO2, Au-TiO2, Ag/Au-TiO2 otrzymanych w mikroemulsji woda/AOT/cykloheksan. Najwyższą aktywność w procesie fotoredukcji...
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Pyrolysis as an alternative for combustion of waste
PublikacjaProces pirolizy polega na rozkładzie materii organicznej w podwyższonej temperaturze w warunkach beztlenowych, dlatego może być on stosowany jako alternatywa lub uzupełnienie dla procesu spalania. Piroliza pozwala na uzyskanie substancji chemicznych z polimerów naturalnych i syntetycznych. W umiarkowanej temperaturze (300 - 500 ° C), można uzyskać wysokiej wydajności frakcji ciekłej, natomiast wysokie temperatury sprzyjają powstawaniu...
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Redefiniowanie przestrzeni medycznej = Redefining healthcare space
PublikacjaSzpital jest obiektem publicznym, budynkiem-miastem, jego architektura nakierowana jest na realizację procesu leczenia i zdrowienia, a jednocześnie formuje przestrzenne ramy mikrokosmosu interakcji społecznych rozgrywających się pomiędzy pacjentami i personelem, gośćmi i „mieszkańcami”. Współcześnie w podejściu do rozumienia czym jest szpital - a zatem również do kształtowania architektury obiektów medycznych - można zauważyć dwa...
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Analiza Niezawodności Człowieka w Ramach Funkcji związanych z Bezpieczeństwem w Przykładowej Instalacji
PublikacjaW analizie bezpieczeństwa funkcjonalnego systemów sterowania i zabezpieczeń należy określić wymagany poziom nienaruszalności bezpieczeństwa SIL w procesie analizy ryzyka, a następnie zweryfikować ten poziom stosując odpowiednie metody modelowania probabilistycznego. Działania człowieka mogą mieć istotny wpływ na realizację funkcji bezpieczeństwa. Wpływ ten ocenia się na podstawie wyników analizy niezawodności człowieka HRA. W niniejszym...
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A note on polynomial algorithm for cost coloring of bipartite graphs with Δ ≤ 4
PublikacjaIn 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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Detection of debonding in reinforced concrete beams using ultrasonic transmission tomography and hybrid ray tracing technique
PublikacjaThis paper concerns inspection of reinforced concrete elements, with particular emphasis on assessing the quality of the adhesive connection between steel and concrete. A novel theoretical model was developed to determine the paths of transmitted, refracted and reflected elastic waves as well as a creeping wave propagated along the inclusion surface. Imaging the internal structure of tested beams was based on wave propagation measurements...
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Proton transfer reactions for ionized water clusters
PublikacjaCalculations of formation energies of the ionized water clusters and energies of reactions between small (including less than eight water molecules) neutral and positively ionized water clusters are presented. Moreover, we discuss some reaction paths between neutral and positively charged dimers, trimers and tetramers and proton transfer reactions (PTR) between cyclic clusters and H3O+ ions which can appear in beam experiments...
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Large thermo-elastic displacement and stability FEM analysis of multilayered plates and shells
PublikacjaThe paper concerns the load capacity analysis of thermally loaded multilayered plates and shells. The multilayered body is treated as an equivalent single layer whose kinematics is consistent with first order shear deformation theory. The authors focus on the thermo-elastic stability problem of the thin-walled structures. The equilibrium paths are traced with the use of Riks-Wempner-Ramm algorithm. By making use of the Tsai-Wu...
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Examination of epigenetic inhibitor zebularine in treatment of skin wounds in healthy and diabetic mice
PublikacjaDNA methyltransferase inhibitor zebularine was proven to induce regeneration in the ear pinna in mice. We utilized a dorsal skin wound model to further evaluate this epigenetic inhibitor in wound healing. Full-thickness excisional wounds were made on the dorsum of 2 and 10-month-old healthy BALB/c and 3 and 8-month-old diabetic (db/db) mice, followed by topical or intraperitoneal zebularine delivery. Depending on the strain, age,...
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Singlet oxygen-dominated peroxymonosulfate activation by layered crednerite for organic pollutants degradation in high salinity wastewater
PublikacjaAdvanced oxidation processes have been widely studied for organic pollutants treatment in water, but the degradation performance of radical-dominated pathway was severely inhibited by the side reactions between the anions and radicals, especially in high salinity conditions. Here, a singlet oxygen (1O2)-dominated non-radical process was developed for organic pollutants degradation in high salinity wastewater, with layered crednerite...
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Regulation of the First Committed Step in Lipopolysaccharide Biosynthesis Catalyzed by LpxC Requires the Essential Protein LapC (YejM) and HslVU Protease
PublikacjaWe previously showed that lipopolysaccharide (LPS) assembly requires the essential LapB protein to regulate FtsH-mediated proteolysis of LpxC protein that catalyzes the first committed step in the LPS synthesis. To further understand the essential function of LapB and its role in LpxC turnover, multicopy suppressors of ΔlapB revealed that overproduction of HslV protease subunit prevents its lethality by proteolytic degradation...
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Energy roadmaps for the city of Gdańsk
PublikacjaThe paper presents energy roadmaps for Gdansk in three time perspectives: short-term (the year 2012), medium-term (2020) and long-term (2050). The paper is a result of the research carried out under the PATH-TO-RES project, supported by European Commission programme SAVE Altener Intelligent Energy Europe.
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Parallel implementation of a Sailing Assistance Application in a Cloud Environment
PublikacjaSailboat weather routing is a highly complex problem in terms of both the computational time and memory. The reason for this is a large search resulting in a multitude of possible routes and a variety of user preferences. Analysing all possible routes is only feasible for small sailing regions, low-resolution maps, or sailboat movements on a grid. Therefore, various heuristic approaches are often applied, which can find solutions...
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Simulation Environment in Python for Ship Encounter Situations
PublikacjaTo assess the risk of collision in radar navigation distance-based safety measures such as Distance at the Closest Point of Approach and Time to the Closest Point of Approach are most commonly used. Also Bow Crossing Range and Bow Crossing Time measures are good complement to the picture of the meeting situation. When ship safety domain is considered then Degree of Domain Violation and Time to Domain Violation can be applied. This...
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Child-Robot Interaction Studies During COVID-19 Pandemic
PublikacjaThe coronavirus disease (COVID-19) pandemic affected our lives deeply, just like everyone else, the children also suffered from the restrictions due to COVID-19 affecting their education and social interactions with others, being restricted from play areas and schools for a long time. Although social robots provide a promising solution to support children in their education, healthcare, and social interaction with others, the precautions...
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Towards Improving Optimised Ship Weather Routing
PublikacjaThe aim of the paper is to outline a project focusing on the development of a new type of ship weather routing solution with improved uncertainty handling, through better estimation of ship performance and responses to sea conditions. Ensemble forecasting is considered to take into account the uncertainty levels that are typical of operations in a stochastic environment. Increased accuracy of weather prediction is achieved through...
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Technological and Media Platforms: Redefinition of Meanings as Symbolic Power over the Discourse
PublikacjaRedefining the meanings of such social terms as “likes” and “friends” on Facebook is a popular practice. In terms of consistency, the (auto)-redefinition of the term “platform” is itself particularly important from a media management perspective. The article proposes to consider the redefinition of meanings as a form of wielding non-transparent power over discourse. From this perspective, redefining a meaning is a form of holding...
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Influence of the Widespread Use of Corten Plate on the Acoustics of the European Solidarity Centre Building in Gdansk
PublikacjaThis paper describes the relationship between a strong architectural vision that is difficult to balance, and user expectations in terms of acoustics. The focus is on the use of corten steel as the dominant finishing material on façades and interiors to achieve an expressive, symbolic message through program-based design. The architectural premises justifying the adopted solutions are presented, especially the universality and...