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Search results for: spektroskopia mas
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Mass transfer of HCl and H2O across the hydrophobic membrane during membrane distillation
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Gas sensing by resistance fluctuations in Pd x WO 3 nanoparticle films
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The measurement and calculation of gas temperature inside a switchgear during fault arc period.
PublicationW artykule przedstawiono metodę obliczania temperatury gazu wewnątrz rozdzielnicy szczelnej z izolacją powietrzną podczas zwarć łukowych w oparciu o równanie przewodnictwa cieplnego. Przedstawiono wyniki badań eksperymentalnych temperatury gazów podczas zwarć z łukiem wędrującym. Opisano model do badań, układ probierczy i warunki badań. Wyniki obliczeń porównano z wynikami badań eksperymentalnych.
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Dynamic stability and spatial heterogeneity in the indyvidual-based modelling of a Lotka-Volterra gas.
PublicationPrzedstawiono wyniki symulacji systemu drapieżnik-ofiara. Dynamika populacji jest opisana oddziaływaniami typu Lotki Volterry ala uzyskane efekty przestrzenne różnia się od rozwiązań równań Lotki Voltery. Do analizy wyników symulacji uzyto miary entropii i korelacji. Entropia oscyluje w rytmie zgodnym z całą populacją, zaś średnie wartości korelacji skrosnej są zależne od rozmiarów okna obserwacji.
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Pewne aspekty zastosowania skończonych elementów EAS w zagadnieniach geometrycznie nieliniowych.
PublicationOpracowanie zawiera wyniki badań nad zastosowaniem elementów o wzbogaconym polu odkształceń w zakresie geometrycznie nieliniowym. Badania dotyczą wpływu dystorsji siatki na zbieżność rozwiązania. Przykład wskazuje na przewagę elementu o wzbogaconym polu odkształceń nad standardowym elementem przemieszczeniowym w zakresie dużych przemieszczeń.
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Porównanie różnych metod pomiarów wysokości barier potencjału w strukturach MOS.
PublicationW referacie omówiono sposoby eliminacji problemów upływności bramki przy pomiarach charakterystyk C(V) kondnsatorów z ultra-cienkim tlenkiem bramki. Przedstawiono sposoby wykorzystania trójelementowego schematu zastępczego kondensatora MOS i przykład analizy pojemności, konduktancji tlenku i rezystancji szeregowej, zmierzonych przy pomocy miernika impedancji Agilent 4294A.
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Wysokoczestotliwościowy model małosygnałowy tranzystora MOS uwzgledniający efekt nasycenia prędkosci nośników.
PublicationZaproponowano nowy małosygnałowy model wysokoczęstotliwościowy tranzystora MOS oraz przedstawiono wyniki jego weryfikacji eksperymentalnej w zakresie częstotliwości aż do 30 GHz.
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TiO2 and Reducing Gas: Intricate Relationships to Direct Reduction of Iron Oxide Pellets
PublicationIn response to the imperative for sustainable iron production with reduced CO2 emissions, this study delves into the intricate role of TiO2 in the direct reduction of iron oxide pellets. The TiO2-dependent reducibility of iron oxide pellets utilizing H2 and CO gas across varied temperatures and gas compositions is thoroughly investigated. Our findings unveil the nuanced nature of the TiO2 effect, underscored by its concentration-dependent...
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UV-assisted fluctuation-enhanced gas sensing by ink-printed MoS2 devices
PublicationIn this work, MoS2 flakes were printed on ceramic substrates and investigated toward 1–10 ppm of nitrogen dioxide (NO2), 2–12 ppm of ammonia (NH3), and 2–12 ppm acetone (C3H6O) under UV light (275 nm). The structure of overlapping MoS2 flakes and UV light assistance affected high responsivity to NO2 when DC resistance was monitored, and superior sensitivity to NH3 was obtained from the low-frequency noise spectra. MoS2 exhibited...
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Comparison of Deep Neural Network Learning Algorithms for Mars Terrain Image Segmentation
PublicationThis paper is dedicated to the topic of terrain recognition on Mars using advanced techniques based on the convolutional neural networks (CNN). The work on the project was conducted based on the set of 18K images collected by the Curiosity, Opportunity and Spirit rovers. The data were later processed by the model operating in a Python environment, utilizing Keras and Tensorflow repositories. The model benefits from the pretrained...
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UV light-activated gas mixture sensing by ink-printed WS2 layer
PublicationWe fabricated a sensing layer from ink-printed WS2 flakes and utilized it for UV-activated gas sensing. The optical imaging of the structure made by repeated printing revealed the continuous layer comprising sub-µm flakes, confirmed independently by small-area AFM images (1×1 µm2). The activity of the sensing surface was investigated locally via AFM scanning of the surface with a polarized probing tip. The results indicated that...
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Zmiana parametrów termodynamicznych panujących w uszczelnieniu labiryntowym, a upust strumienia masy
PublicationUszczelnienia labiryntowe są istotnym elementem konstrukcji turbozespołu parowego. Dzięki zastosowaniu upustu diagnostycznego istnieje możliwość nadzorowania pracy dławnicy, poprzez określenie parametrów termodynamicznych panujących na długości uszczelnienia. Duży wpływ na zmianę parametrów, ilość upuszczanego strumienia masy przez upust diagnostyczny. Praca przedstawia zależność ciśnienia panującego w szczelinie za upustem oraz...
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Research on flue gas flow measurement and modelling in the moving grate biomass boiler
PublicationThe aim of this research was to determine the nature of gas flow in a grate boiler model by the method of Particle Image Velocimetry (PIV) and CFD. The paper presents the comparison of the PIV results with numerical simulations made in the environment of ANSYS Fluent. The main goal of the experiment was to describe the phenomena occurring on the grate. Methodology of modelling solid fuel combustion on the moving grate was proposed...
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"Walerian Wróbel - Zwei Blicke auf das Unrecht am jungen Zwangsarbeiter"
PublicationZur Ausstellung Die tragische Geschichte über das Schicksal des jungen polnischen Zwangsarbeiters Walerian Wróbel (2. April 1925 in Falków — 25. August 1942 in Hamburg) bewegt heute noch viele Menschen. Er wurde im Alter von nur 17 Jahren nach einem Urteil des Sondergerichts Bremen von den Nationalsozialisten hingerichtet. In dieser Ausstellung geht es jedoch nicht um Walerian Wróbel selbst, sondern um den Versuch der...
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KEMR-Net: A Knowledge-Enhanced Mask Refinement Network for Chromosome Instance Segmentation
PublicationThis article proposes a mask refinement method for chromosome instance segmentation. The proposed method exploits the knowledge representation capability of Neural Knowledge DNA (NK-DNA) to capture the semantics of the chromosome’s shape, texture, and key points, and then it uses the captured knowledge to improve the accuracy and smoothness of the masks. We validate the method’s effectiveness on our latest high-resolution chromosome...
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The effects of gas exposure on the graphene/AlGaN/GaN heterostructure under UV irradiation
PublicationThis work demonstrates a graphene/AlGaN/GaN sensing device with two-dimensional electron gas (2DEG) toward nitrogen dioxide (NO2), tetrahydrofuran, and acetone detection under UV light irradiation. We propose combining measurements of the DC characteristics with a fluctuation-enhanced sensing method to provide insight into the gas detection mechanisms in the synergistic structure of highly stable GaN and gas-sensitive graphene....
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Enhanced gas sensing by graphene-silicon Schottky diodes under UV irradiation
PublicationThe effect of ultraviolet (UV) or blue irradiation on graphene/n-doped silicon Schottky junctions toward gas sensing was investigated. Schottky diodes were subjected to oxidizing nitrogen dioxide (NO2, 1–3 ppm) and reducing tetrahydrofuran (THF, 50–200 ppm), showing significantly different responses observed on the currentvoltage (I-V) characteristics, especially under UV light (275 nm). NO2 affected the resistive part of the forward region...
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Melanoma skin cancer detection using mask-RCNN with modified GRU model
PublicationIntroduction: Melanoma Skin Cancer (MSC) is a type of cancer in the human body; therefore, early disease diagnosis is essential for reducing the mortality rate. However, dermoscopic image analysis poses challenges due to factors such as color illumination, light reflections, and the varying sizes and shapes of lesions. To overcome these challenges, an automated framework is proposed in this manuscript. Methods: Initially, dermoscopic...
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Negative carbon dioxide gas power plant integrated with gasification of sewage sludge
PublicationOne of the primary objectives of the negative carbon dioxide gas power plant (nCO2PP) is to develop an innovative technology confirming the possibility of the use of sewage sludge to produce electricity while having a positive impact on the environment. In this paper, a mathematical model is presented to estimate thermodynamic parameters of the system in relation to the gasification process and changes in such parameters in the...
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VOCs absorption from gas streams using deep eutectic solvents – A review
PublicationVolatile organic compounds (VOCs) are one of the most severe atmospheric pollutants. They are mainly emitted into the atmosphere from anthropogenic sources such as automobile exhaust, incomplete fuel combustion, and various industrial processes. VOCs not only cause hazards to human health or the environment but also adversely affect industrial installation components due to their specific properties, i.e., corrosive and reactivity....
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Use of pyridinium and pyrrolidinium ionic liquids for removal of toluene from gas streams
PublicationSeparation of toluene from a toluene/N2 gas mixture using supported liquid membranes based on a series of pyridinium (1-butylpyridinium- bis(trifluoromethylsulfonyl)imide - [C4Py][Tf2N], 1-hexylpyridinium trifluoromethanesulfone [C6Py][Tf2N]) and pyrrolidinium (1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide - [C4Pyrr][Tf2N], 1-hexyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide - [C6Pyrr][Tf2N], 1-butyl-1-methylpyrrolidinium...
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Excitation of Non-Wave Modes by Sound of Arbitrary Frequency in a Chemically Reacting Gas
PublicationThe nonlinear phenomena in the field of high intensity sound propagating in a gas with a chemical reaction, are considered. A chemical reaction of A → B type is followed by dispersion and attenuation of sound which may be atypical during irreversible thermodynamic processes under some conditions. The first and second order derivatives of heat produced in the chemical reaction evaluated at the equilibrium temperature, density and...
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Evaluation of EMAS system functioning in private sector units, DCT Gdansk included
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Objective 3D Printed Surface Quality Assessment Based on Entropy of Depth Maps
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Concept of the multidimensional diagnostic tool based on exhaust gas composition for marine engines
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Separation of CO2 from flue gas in air-sparged hydrocyclone (ash) reactor
PublicationPrzedmiotem badań była absorpcja dwutlenku węgla w wodnym roztworze wodorotlenku sodu, z fazy gazowej w skali laboratoryjnej i technologicznej z wykorzystaniem reaktora typu ash. Natężenie przepływu powietrza wynosiło 900 dm3/min a wodnego roztworu NaOH 15 dm3/min w skali technologicznej. Zbadano stężenie CO2, pH w fazie ciekłej, wpływ natężenia przepływu fazy gazowej i fazy ciekłej na efektywność absorpcji
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An application of advanced data processing methods to response analysis of electrocatalytic gas sensor
PublicationPrzedstawiono stosowane dotychczas oraz zaproponowano nowe metody analizy odpowiedzi czujników elektrokatalitycznych. Porównano ich właściwości.
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Rekonstruktion des Baudenkmals ''Das grune Tor'' in Danzing nach einem Teileinsturz.
PublicationW pracy przedstawiono opis konstrukcyjny zabytkowej ''Zielonej Bramy'' w Gdańsku, która jako kilkukondygnacyjny obiekt murowany została wzniesiona w XVI wieku nad brzegiem Motławy. Podczas prowadzenia prac rmontowych w styczniu 2002r uległ zawaleniu fragment sklepienia wraz z podpierającą go kamienną kolumną. Dokładny przegląd całej konstrukcji wykazał, że bardzo zły stan także innych elementów konstrukcji nośnej tego obiektu....
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Mass Spectrometric Identification of 13C-Labeled Metabolites DuringAnaerobic Propanoic Acid Oxidation
PublicationBiowaste digestion is a possibility to gain biogas as a renewable fuel source. However, the anaerobic food chain may be disrupted by, e.g., substrate overload or by inhibitors, leading to the accumulation of volatile fatty acids (VFAs), predominantly of propanoic acid (PA). VFA Accumulation may cause a rapid pH decrease, less biogas production, or even a total inhibition. To maintain high biogas productivity or to prevent a collapse...
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Multistatic sonar for man-made lakes and water-power plants antiterrroristic protection
PublicationArtykuł opisuje nową koncepcję dopplerowskiego sonaru multistatycznego opracowanego w Katedrze Systemów Elektroniki Morskiej Politechniki Gdańskiej. System składa się z sieci hydrofonów rozmieszczonych równomiernie w obserwowanym akwenie oraz ze źródła dźwięku w postaci fali ciągłej o stałej częstotliwości i bardzo niskim natężeniu. Dzięki zastosowaniu specjalnie opracowanych algorytmów przetwarzania sygnałów uzyskuje się poprawną...
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Use of imidazolium ionic liquids for carbon dioxide separation from gas mixtures
PublicationNowoczesnym podejściem do separacji tlenku węgla (IV) z mieszanin gazowych jest zastosowanie cieczy jonowych jako materiału absorpcyjnego. Niemierzalna prężność par i możliwość modyfikacji budowy kationu i wyboru anionu cieczy jonowych sprawiają, że związki te mogą zastąpić obecnie stosowane aminy. Przedstawiono wpływ struktury chemicznej cieczy jonowych, ciśnienia oraz temperatury na efektywność absorpcji CO2 i innych gazów w...
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Solid electrolyte gas sensors based on cyclic voltammetry with one active electrode
PublicationW artykule przedstawiono wyniki badań elektrokatalitycznego czujnika gazów toksycznych z jedną elektrodą aktywną.
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Volatile organic compound separation from gas phase using ionic liquids
PublicationZanieczyszczenie powietrza lotnymi związkami organicznymi staje się światowym problemem ochrony środowiska w związku z ich toksycznymi właściwościami. W związku z tym poszukuje się nowych, efektywnych technologii oczyszczania strumieni gazowych. Powszechnie stosowaną metodą jest utlenianie termiczne. Wiąże się ono jednak z Wysokiem zużyciem energii i efektami ubocznymi w postaci emisji dwutlenku węgla i tlenków azotu. Alternatywą...
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Metody określenia i wykorzystania zdolności produkcyjnych w warunkach Mass Customization
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Minimizing the number of periodic points for smooth maps. Non-simply connected case
PublicationNiech f będzie gładkim odwzorowaniem zamkniętej rozmaitości o wymiarze wiekszym niż 2, a r ustaloną liczbą naturalną. W artykule zdefiniowany został niezmiennik topologiczny równy minimalnej liczbie punktów r-periodycznych w gładkiej klasie homotopii f.
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COMPARATIVE ANALYSIS OF THE RESULTS OF GAS FLOW IN A LABYRINTH SEAL FOR A NUMERICAL AND THEORETICAL MODEL
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FATE OF LAS SURFACT ANTS IN WWTPs BASED ON MEASURED CONCENTRATIONS IN WASTEWATER AND SLUDGE
PublicationThe fate of the surfactant LAS in the two different types of Waste Water Treatment Plants has been reviewed: the small “Swarzewo” WWTP (45 000 PE), and large WWTP “Wschód” (760 000 PE). The elimination of LAS from the water stream in Swarzewo (98,7%), is better than that found in Gdańsk (97,6%). In the sludge treatment course, the reduction of LAS in Swarzewo is greater than that in Gdańsk due to the greater biodegradation of LAS...
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Assessment of protective properties of rubber lining in absorbers of flue gas desulphurization systems.
PublicationResults of research on degradation of rubber lining which is the main protection of absorbers in flue gas desulphurization (FGD) systems were presented. The power plant where the system operated is lignite-fired. Owing to measurements using electrochemical impedance spectroscopy and gravimetric determination of water content in the lining, the areas of the system which are most exposed to degradation were shown. The results obtained...
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Determination of Odour Interactions of Three-Component Gas Mixtures Using an Electronic Nose
PublicationThe paper presents an application of an electronic nose prototype comprised of six TGS-type sensors and one PID-type sensor to identify odour interaction phenomena in odorous three-component mixtures. The investigation encompassed eight odorous mixtures—toluene-acetone-triethylamine and formaldehyde-butyric acid-pinene — characterized by different odour intensity and hedonic tone. A principal component regression (PCR) calibration...
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Cooperation of ORC installation with a gas boiler as a perspective co-generation system for households
PublicationThis paper reports tests of an innovative micro-CHP unit prototype, consisting of a traditional gas boiler and organic Rankine cycle (ORC), which incorporates original system components such as an axial vapour microturbine, evaporator and condenser. The system co-generates heat and electricity for a single household or a group of households. Electricity is only a by-product during production of heat. While testing the prototype,...
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Analysis of distance measurement errors in CW FM sonar with MLS code modulation
PublicationAlthough used in the classic silent sonar, the CW FM sounding signal has a major flaw which is its inaccuracy in determining the distance to a target. The authors of the article have developed a concept of silent sonar using frequency modulation signals switched by pseudorandom codes, already discussed in their previous work. This article presents a detailed analysis of errors in CW FM sonar with pseudo-random sequence code modulation...
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OPERATION OF TWO-SHAFT GAS TURBINE IN THE RANGE OF OPEN ANTI-SURGE VALVE
PublicationThis paper presents experimental tests of full-scale two-shaft gas turbine in the range of open anti-surge valve (ASV). The tests were carried out in a laboratory gas- turbine test stand belonging to Department of Automation and Power Engineering , Faculty of Ocean Engineering and Ship Technology , Gdańsk University of Technology. The tests covered the start-up and low load operation of the turbine set in the range of open...
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Experimental Designs of Mass Customized Passive Single-family Houses - Prospects and Limitations
PublicationAbstract The article deals with case studies of selected architectural designs of the past fifteen years the authors of which intended to rethink both the typology and the means of constructing single family houses. The analysis covers contemporary design issues such as variation, curvilinearity, customization, digital manufacturing and ecological concerns. The purpose behind the research was to establish in what way new design...
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Funcionality assessment of Citrus Hysteria peel as a protective barrier using gas chromatography
PublicationThe aim of this study was to analyse the volatile fractions of fruit peel and pulp using two-dimensional gas chromatography technique coupled with mass spectrometry. The isolation of the compounds was achieved by microextraction to the stationary phase from the headspace of the sample (HS-SPME). Mass spectrometry with time-of-flight analyser (TOF-MS) was used to identify the chemical compounds. There are no reports in the literature...
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Co ulewa to nas zalewa. Czy nowe prawo wodne nam pomoże?
PublicationZmiana ustawy prawo wodne. Podstawowe zmiany w stosunku do wcześniejszych regulacji. Problem wód opadowych - nowe zadania stawiane samorządom lokalnym.
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Towards Precise Visual Navigation and Direct Georeferencing for MAV Using ORB-SLAM2
PublicationA low accuracy of positioning using Global Navigation Satellite System (GNSS) are not meet geodetic requirements for direct images georeferencing for Unmanned Aerial Vehicle (UAV) photogrammetry. A majority of UAVs are equipped with a monocular or stereo non-metric cameras for either visual data gathering or live video feed for operator. A cheap positioning techniques used on board commercial UAVs are not that precise as geodetic...
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Radioisotope measurements of the liquid-gas flow in the horizontal pipeline using phase method
PublicationThe paper presents application of the gamma-absorption method to a two-phase liquid-gas flow investigation in a horizontal pipeline. The water-air mixture was examined by a set of two Am-241 radioactive sources and two NaI(Tl) scintillation probes. For analysis of the electrical signals obtained from detectors the cross-spectral density function (CSDF) was applied. Results of the gas phase average velocity measurements for CSDF...
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Standard of living in Poland at regional level - classification with Kohonen self-organizing maps
PublicationThe standard of living is spatially diversified and its analyzes enable shaping regional policy. Therefore, it is crucial to assess the standard of living and to classify regions due to their standard of living, based on a wide set of determinants. The most common research methods are those based on composite indicators, however, they are not ideal. Among the current critiques moved to the use of composite...
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High resolution liquid chromatography and time of flight mass spectrometry in perfume analysis
PublicationPerfumes consist of a wide range of natural and synthetic compounds that belongs to different chemical classes. Most of these compounds are generally determined by GC. However, in this study RP-HPLC-Q-TOF-MS and HILIC-Q-TOF-MS technique was applied for the determination of ingredients of original perfumes and their imitations. Antioxidants and compounds specific to fragrances of animal \origin were found in original...
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Determination of Metals Content in Wine Samples by Inductively Coupled Plasma-Mass Spectrometry
PublicationKnowledge about the metal content of wine is very important, for many reasons. Depending on the element, its quantity varies in wine from ng/L to mg/L. Despite the fact that metals are not directly connected to the taste and aroma of the wine, their content should be determined and controlled, because excess is undesirable, and in some cases prohibited, due to potential toxicity. Several analytical procedures for metal determination...