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    Wyświetlanie 1-4 z 4
    Tytuł:
    Using a segmented voltage sweep mode and a Gaussien curve fitting method to improve heavy metal measurement system performance
    Autorzy:
    Dias Pereira, J. M.
    Postolache, O.
    Silva Girao, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/220629.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heavy metals measurement
    electrochemical analysis
    voltammetry
    auto-calibration and curve fitting
    Opis:
    This paper presents a voltammetric segmented voltage sweep mode that can be used to identify and measure heavy metals' concentrations. The proposed sweep mode covers a set of voltage ranges that are centered around the redox potentials of the metals that are under analysis. The heavy metal measurement system can take advantage of the historical database of measurements to identify the metals with higher concentrations in a given geographical area, and perform a segmented sweep around predefined voltage ranges or, alternatively, the system can perform a fast linear voltage sweep to identify the voltammetric current peaks and then perform a segmented voltage sweep around the set of voltages that are associated with the voltammetric current peaks. The paper also includes the presentation of two auto-calibration modes that can be used to improve system's reliability and proposes the usage of a Gaussian curve fitting of voltammetric data to identify heavy metals and to evaluate their concentrations. Several simulation and experimental results, that validate the theoretical expectations, are also presented in the paper.
    Źródło:
    Metrology and Measurement Systems; 2012, 19, 2; 381-394
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrochemical grinding of titanium-containing materials
    Autorzy:
    Przystupa, K.
    Litak, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/102219.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    hybrid processes
    electrochemical grinding (ECG)
    micro short-circuit
    time-frequency analysis
    Opis:
    The paper focuses on machining difficult-to-cut materials where a significant component is titanium. The paper discusses a complex process of electrochemical grinding (ECG). A practical example was given by discussing the results of ECG. Selected difficult-to-cut materials, along with their typical ECG properties, were compared. In addition, the paper discusses the phenomenon of micro short-circuits constituting a form of an interference characteristic for the process. The results presented in the paper refer to the phenomenon of a micro short-circuits, i.e. the case when a rapid and uncontrolled electrical discharge occurs in the machining zone. The paper presents examples of recorded micro short-circuits and attempts a time-frequency analysis regarding the occurrence of the disturbance. To reveal the dynamics of the ECG process we applied wavelet analysis.
    Źródło:
    Advances in Science and Technology. Research Journal; 2017, 11, 4; 183-188
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wyznaczanie wartości czasu wykorzystania mocy zainstalowanej elektrolizera zasilanego z farmy fotowoltaicznej
    Determination of the value of the time of using the installed power of the electrolyser supplied from the photovoltaic farm
    Autorzy:
    Ceran, Bartosz
    Wróblewski, Robert
    Powiązania:
    https://bibliotekanauki.pl/articles/2204800.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
    Tematy:
    wodór
    elektrolizer PEM
    analiza energetyczna
    bateria elektrochemiczna
    hydrogen
    PEM electrolyser
    energy analysis
    electrochemical battery
    Opis:
    W rozdziale przedstawiono przykłady inwestycji w technologie wodorowe w Polsce. Przedstawiono wyniki analizy energetycznej układu farma fotowoltaiczna–elektrolizer do produkcji czystego, zielonego wodoru. Zdefiniowano wzór na czas wykorzystania mocy zainstalowanej elektrolizera zasilanego z farmy PV oraz wyznaczono jego wartość. Przedstawiono profil produkcji energii elektrycznej przez farmę PV. Obliczenia wykonano na podstawie danych nasłonecznienia dla lokalizacji miasta Poznania. Przytoczono wzór na wartość mocy generowanej przez farmę PV oraz wzory pozwalające określić roczną wartość masy wyprodukowanego wodoru. Przebadano wpływ wartości stosunku mocy elektrolizera do mocy farmy fotowoltaicznej (PEL/PPV) na wartość czasu wykorzystania jego mocy zainstalowanej. Wyniki analizy przedstawiono w formie graficznej za pomocą charakterystyki PEL/PPV = f(TEL). Zaproponowano metodologię doboru mocy i pojemności baterii elektrochemicznej w celu zwiększenia produkcji wodoru.
    The chapter presents examples of investments in hydrogen technologies in Poland. The results of the energy analysis of the photovoltaic farm-electrolyser system for the production of pure, green hydrogen are presented. The formula for the use of the installed power of the electrolyser supplied from a PV farm was defined and its value was determined. The profile of electricity production by a PV farm was presented. The calculations were made on the basis of insolation data for the city of Poznań. The formula for the value of the power generated by the PV farm and the formulas allowing to determine the annual value of the mass of produced hydrogen were presented. The influence of the ratio of the electrolyser power to the power of a photovoltaic farm (PEL/PPV) on the value of the utilization time of its installed power was investigated. The results of the analysis are presented graphically by means of the PEL/PPV = f(TEL) characteristic. A methodology for selecting the power and capacity of an electrochemical battery was proposed to increase hydrogen production.
    Źródło:
    Zeszyty Naukowe Instytutu Gospodarki Surowcami Mineralnymi i Energią PAN; 2023, 111; 131--142
    2080-0819
    Pojawia się w:
    Zeszyty Naukowe Instytutu Gospodarki Surowcami Mineralnymi i Energią PAN
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Justification of the most rational method for the nanostructures synthesis on the semiconductors surface
    Autorzy:
    Suchikova, Y.
    Vambol, S.
    Vambol, V.
    Mozaffari, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/368501.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    hierarchies’ analysis method
    chemical etching
    electrochemical etching
    lithographic etching
    nanostructures synthesis
    metoda hierarchii analitycznej
    trawienie chemiczne
    wytrawianie elektrochemiczne
    litografia
    synteza nanostruktur
    Opis:
    Purpose: of this paper is to justification the most rational method for the nanostructures synthesis on the semiconductors surface, which is capable of providing high quality synthesized nanostructures at low cost and ease of the process. Design/methodology/approach: The choice of the optimal method of synthesis was carried out using the hierarchy analysis method, which is implemented by decomposing the problem into more simple parts and further processing judgments at each hierarchical level using pair comparisons. Findings: The article describes the main methods of synthesis of nanostructures, presents their advantages and disadvantages. The methods were evaluated by such criteria as: environmental friendliness, efficiency, stages number of the technological process, complexity, resources expenditure and time and effectiveness. Using the hierarchy analysis method, has been established that electrochemical etching is the most important alternative, and when choosing a nanostructures synthesis method on the semiconductors surface, this method should be preferred. Such studies are necessary for industrial serial production of nanostructures and allow reducing expenses at the realization of the problem of synthesis of qualitative samples. Research limitations/implications: In this research, the hierarchy analysis method was used only to select a rational method for synthesizing nanostructures on the semiconductors surface. However, this research needs to be developed with respect to establishing a correlation between the synthesis conditions and the nanostructures acquired properties. Practical implications: First, was been established that the optimal method for the nanostructures synthesis on the semiconductors surface is electrochemical etching, and not lithographic or chemical method. This allowed the theoretical and empirical point of view to justify the choice of the nanostructures synthesis method in the industrial production conditions. Secondly, the presented method can be applied to the synthesis method choice of other nanostructures types, which is necessary in conditions of resources exhaustion and high raw materials cost. Originality/value: In the article, for the first time, the choice of the nanostructures synthesis method on the semiconductors surface is presented using of paired comparisons of criteria and available alternatives. The article will be useful to engineers involved in the nanostructures synthesis, researchers and scientists, as well as students studying in the field of "nanotechnology".
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2019, 92, 1-2; 19-28
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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