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Search results for: IMPEDANCE MATCHING, INTERDIGITATED STRUCTURE, METAL MOUNTABLE TAG ANTENNA, MINIATURE UHF TAG ANTENNA
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Evaluation of pitting corrosion by means of dynamic electrochemical impedance spectroscopy.
PublicationPrzeprowadzono badania stali stopowej 304L metodą dynamicznej elektrochemicznej spektroskopii impedancyjnej w warunkach liniowo zmieniającego się potencjału. Określono ogólny schemat układu elektrycznego dla elektrody ulegającej korozji. Przeprowadzone badania pozwalają na jednoczesne badanie zachowania się stali stopowej w stanie pasywnym, podczas stanu przejściowego (metastabilne tworzenie się i repasywacja wżerów) oraz w stanie...
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The Goertzel filter-bank usage in the non-stationary impedance measurement.
PublicationArtykuł prezentuje metodę pomiaru parametrów impedancyjnych w warunkach niestacjonarnych bazującą na próbkowaniu sygnałów pomiarowych i przetwarzaniu cyfrowym. Zaproponowano i przeanalizowano zastosowanie banku filtrów Goertzela. Porównano zaproponowane podejście z tradycyjnie stosowaną metodą STDFT. Przedstawiono wynik symulacji i pomiarów.
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Ionophores in polymeric membranes for selective ion recognition; impedance studies
PublicationBadania impedancyjne membran zawierających jonofory selektywne na kation Na+ (L1) i Cs+(L2) wykazały, ze stala dielektryczna materiału membrany zależy od typu uzytego plastyfikatora i zmienia się w zakresie od 28 do 60. Rezystancja membran zawierających ligand L1 i L2 wynosi 0.15 -1.4 Mohm w zależności od stężenia elektrolitu zewnnetrznego. Testowona dwa typy elektrod jonoselektywnych: elektrody typu ASS z polimerem przewodzącym...
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Dynamic electrochemical impedance spectroscopy of the first order electrode reaction
PublicationCiągłe transformaty STFT sinusoidalnego sygnału pobudzenia i odpowiedzi prądowej zostały wyznaczone dla reakcji elektrodowej pierwszego rzędu. Wyznaczono impedancję elektrody w łącznej dziedzinie czasu i częstotliwości. Wykonano pomiary dla reakcji redukcji Cd(II) na rtęciowej elektrodzie kroplowej w funkcji potencjału. Przedstawiono możliwość wyznaczenia chwilowych widm impedancyjnych. Opisano zależność rezystancji przeniesienia...
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Microsystem for measurement of impedance sensors parameters.Optoelectronic and electronic sensors V.
PublicationW artykule przedstawiono mikrosystem do pomiaru parametrów impedancyjnych czujników o module impedancji z przedziału 100ohm-1Gohm. Zastosowana w mikrosystemie technika cyfrowego przetwarzania sygnałów, pozwoliła na uzyskanie szerokiego zakresu częstotliwości pomiarowych, zwłaszcza bardzo niskich od 100uHz do 1MHz, przy zachowaniu prostej konstrukcji zapewniającej jego niską cenę. Mikrosystem zrealizowano w formie przyrządu...
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Evaluating and predicting the performance of organic coatings using impedance spectroscopy
PublicationPrzedstawiono wyniki badań cyklicznych, sinusoidalnych zmian temperatury na powłokowe systemy ochronne o skrajnie różnych właściwościach antykorozyjnych. Porównano zachowanie nowej powłoki poliestrowej typu "coil-coating" na ocynkowanej stali uprzednio eksponowanej w warunkach atmosferycznych alkidowej powłoki malarskiej na podłożu stalowym. Badania przeprowadzono przy zastosowaniu techniki spektroskopii impedancyjnej. Stwierdzono...
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Impedancyjne badanie korozji wżerowej. Impedance measurements of pitting corrosion
PublicationKryteria zachodzenia korozji wżerowej związane są z badaniami tego zjawiska metodą cyklicznej polaryzacji i opierają się na wartości gęstości prądu lub bezwzględnej wartości prądu płynącego w układzie. Na podstawie przeglądu literaturowego wybrano cztery kryteria stosowane przy badaniu stali stopowych metodą cyklicznej polaryzacji. Dla warunków prądowych odpowiadających kryteriom zachodzenia korozji wżerowej przedstawiono widma...
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The influence of parameters of input probe on the error of high impedance measurement
PublicationW artykule przedstawiono sondę do pomiaru wysokich impedancji w zakresie 1kohm<|Zx|<100Gohm przeznaczoną do dołączenia do analizatorów typu gain-phase. Przeanalizowano wpływ parametrów sondy (pojemności pasożytnicze, toleranca rezystorów określających wzmocnienie wzmacniacza) na dokładność wyznaczenia modułu i argumentu zespolonego stosunku sygnałów wydzielonych w sondzie. Zamieszczono wyniki symulacji i pomiarów, pozwalające na...
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The contribution of blood-flow-induced conductivity changes to measured impedance
PublicationW pracy rozwazane sa zmiany przewodnosci zachodzace w anizotropowym osrodku i ich wplyw na mierzona rezystancje. Uzyskano to za pomoca rozszerzenia wzoru Geselowizta na przypadki anizotropowe. Wykazano, ze tylko te skladowe zmian przewodnosci wplywaja na mierzona rezystancje, dla ktorych odpowiadajacy im skladnik pola eklektrycznego byl niezerowy.Wyniki te zastosowanu do zmian rezystywnosci wywolanych zmiananmi przewodnosci plynacej...
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Optimization of impedance measurements using ''chirp'' type perturbation signal
PublicationW pracy przedstawiono innowacyjny sposób pomiaru impedancji przy użyciu sygnału niestacjonarnego "chirp". W procesie akwizycji pobudzenia i odpowiedzi prądowej zastosowano zmienną częstotliwość próbkowania. Podejście takie pozwala zarówno na wielokrotne zmniejszenie ilości niezbędnych do otrzymania widma impedancyjnego rejestrowanych danych jak również upraszcza i przyspiesza proces obliczeniowy. Stwierdzono iż dokładność wyników...
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On-line measurement of cell impedance during charging and discharging process
PublicationW pracy przedstawiono założenia metody pomiaru impedancji, która w przeciwieństwie do dotychczasowych technik impedancyjnych stosowanych w badaniach ogniw, umożliwia pracę on-line. W celu zaprezentowania możliwości metody wykonano eksperyment polegający na cyklicznym ładowaniu i rozładowywaniu elektrody ołowianej w 4.8M H2SO4 z jednoczesnym pomiarem impedancji. Zmiany parametrów elektrycznych otrzymanych w wyniku analizy widm impedancyjnych...
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BLOOD PRESSURE ESTIMATION BY MEANS OF A JOINT IMPEDANCE– PHOTOPLETYSMOGRAPHIC METHOD
PublicationThe knowledge of patient’s day to day blood pressure changes is invaluable to physicians for both diagnostics and health monitoring reasons. Constant observation of the pressure throughout a day would provide even more valuable clinical information. A convenient non-invasive methods of blood pressure estimation for monitoring purposes are widely proposed. This work shows a statistical approach to...
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Structure of Microemulsion Formulated with Monoacylglycerols in the Presence of Polyols and Ethanol
PublicationThe influence of polyols as cosurfactants (propylene glycol PG; glycerol G) and short chain alcohol as a cosolvent (ethanol EtOH) on the formation and solubilization capacity of the systems: hexadecane/monoacylglycerols (MAG)/polyol/water:EtOH, at 60C, was investigated. Electrical conductivity measurement, and the DSC method were applied to determine the structure and type of microemulsions formed. The dimension of the droplets...
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Impedance spectra of ZnO varistor type 280 model O M ver. 89
Open Research DataThe impedance spectrum of high-voltage ZnO varistor obtained using FRA EIS impedance spectrosocpy measurement method. The 1V sinusoidal excitation was used. The frequency range was chosen from 10 kHz down to 100 uHz. The object under test and the measuring instrument were placed in a Faraday cage due to high impedance of the object. The data was acquired...
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Nowe potrójne związki w układzie RE2TGe3 (RE – ziemia rzadka, T – metal przejściowy)
PublicationCelem niniejszej pracy była synteza nowych związków międzymetalicznych z rodziny RE2TGe3, gdzie RE to metale ziem rzadkich, a T to metal przejściowy (Pd, Pt). Dokonano tego stosując metodę topienia w łuku elektrycznym. Za pomocą proszkowej dyfrakcji rentgenowskiej ustalono, że udało się otrzymać następujące materiały: Pr2Pd1.15Ge2.85, Sm2PdGe3, Tb2Pd1.25Ge2.85, Dy2Pd1.25Ge2.85, Ho2Pd1.3Ge2.7, Ce2Pt0.9Ge3.1, Pr2Pt1.15Ge2.85, Nd2PtGe3,...
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Linear impedance of 50(2Bi2O3-V2O5)-50SrB4O7 glass measured with impedance spectroscopy method at high temperature region
Open Research DataThe linear electrcial properties of 50(2Bi2O3-V2O5)-50SrB4O7 glass was measured by impedance spectroscopy method.
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Zr‐Based Metal‐Organic Framework UiO‐66/Ultem® 1000 Membranes for Effective CO2/H2 Separation
PublicationMixed-matrix membranes (MMMs) using UiO-66 nanofillers as dispersing inorganic phase and polyetherimide (PEI) as continuous polymeric matrix were synthesized. Different UiO-66 loadings of 10, 20, and 30 wt % were applied. The morphology and UiO-66 dispersion over the prepared MMMs were examined. Gas separation measurements were performed for H2/CO2 gas mixture to evaluate the influence of UiO-66 on the separation yield of resulting...
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Low-cost multi-objective optimization of antennas using Pareto front exploration and response features
PublicationIn the paper, a procedure for low-cost multi-objective optimization of antenna structures is presented. Our approach is based on exploration of the Pareto front representing the best possible trade-offs between conflicting objectives, here, the structure size and its electrical performance. Starting from the design representing the best in-band reflection level, subsequent Pareto-optimal designs are identified through local constrained...
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Coupling coefficients for the space group of the hexagonal close-packed structure
PublicationWe have computed the Clebsch-Gordan coefficients of the representations for the space group of the hexagonal close-packed structure for the points:V, A, H, K, L, M. We enumerate all arms of the wave vector stars and all wave vector selection rules.
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Effect of Different Structure Type Traffic On Railway Line Capacity
PublicationThe article points to methods of analyzing railway traffic conditions based on two parameters: capacity and delay of trains. The impact of the differentiated railway type structure on the capacity of the railway line was presented. Particular attention has been paid to the assessment of commonly used simplifications in analyzes.
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Linear impedance of 10Na2O–60P2O5–30CaO glass measured with impedance spectroscopy method at low temperature region
Open Research DataThe linear electrical properties of 10Na2O–60P2O5–30CaO glass was measured by impedance spectroscopy method.
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Nonlinear impedance of vanadate glasses containing BaTiO3
Open Research DataThe nonlinear impedance of vanadate glasses doped with BaTiO3 was measured. Samples of the composition of x[BaO,TiO2]–(80 − x)V2O5–20Bi2O3 where x = 5, 10 and 15 in mol% were prepared by a conventional melt quenching technique. The melting was performed in alumina crucibles at the temperature of 1273 K–1373 K. The melts were poured on a preheated (573...
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Nonlinear impedance of Bi2VO5.5 glass-ceramic annealed at 423 K was measured with impedance spectroscopy method at high temperature region
Open Research DataThe nonlinear electrical properties of Bi2VO5.5 glass-ceramic annealed at 423 K was measured by impedance spectroscopy method.
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Linear impedance of 1SiO2–99(40Na2O-20CaO-40P2O5) glass measured with impedance spectroscopy method at low temperature region
Open Research DataThe linear electrical properties of 1SiO2–99(40Na2O-20CaO-40P2O5) glass was measured by impedance spectroscopy method.
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Multi-objective optimization for assessment of topological modification in UWB antennas
PublicationThis paper addresses an issue of systematic and rigorous assessment of effects of topological modifications on the performance of compact UWB antennas. Application of fast surrogate-assisted multi-objective optimization procedures allows us for obtaining, in a practically acceptable timeframe, a set of designs representing the best possible trade-offs between conflicting objectives (here, antenna size minimization and reduction...
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Crystal structure, chemical bonding, and physical properties of layered AIrSn2 (A = Sr and Ba)
PublicationWe report the experimental and theoretical investigation of structure, chemical bonding interactions, and physical properties of new ternary stannides AIrSn2 (A = Sr and Ba). AIrSn2 (A = Sr and Ba) crystallizes in the orthorhombic Re3B-type structure with the space group Cmcm (No. 64). According to single-crystal X-ray diffraction results, the structure of AIrSn2 (A = Sr and Ba) can be considered as a Zintl-type compound with heterogeneous...
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Nonlinear impedance of 58(2Bi2O3-V2O5)-42SrB4O7 glass measured with impedance spectroscopy method at low temperature region
Open Research DataThe nonlinear electrcial properties of 58(2Bi2O3-V2O5)-42SrB4O7 glass was measured by impedance spectroscopy method.
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Optical and photocatalytic properties of rare earth metal-modified ZnO quantum dots
PublicationA series of novel ZnO quantum dots modified with rare earth metals was successfully prepared by a simple sol-gel approach. The effects of types (Eu, Er, Tb, Yb, Ho, La) and amounts (from 0.09 to 0.45 mmol) of lanthanides on the optical properties, structural characterization and photocatalytic activity of ZnO/RE QDs were systematically investigated. The X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform...
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Insightful Analysis of Phenomena Arising at the Metal|Polymer Interphase of Au-Ti Based Non-Enzymatic Glucose Sensitive Electrodes Covered by Nafion
PublicationThis paper focuses on the examination of glucose oxidation processes at an electrode material composed of gold nanoparticles embedded in a titanium template. Three dierent conditions were investigated: the chloride content in the electrolyte, its ionic conductivity and the presence of a Nafion coating. The impact of the provided environment on the oxidation reaction was evaluated by cyclic voltammetry (CV) and electrochemical impedance...
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Linear impedance of Bi2VO5.5 ceramic of thickness 2.88 mm measured with impedance spectroscopy method at low temperature region
Open Research DataThe linear electrical properties of Bi2VO5.5 ceramic of thickness 2.88 mm was measured by impedance spectroscopy method.
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Linear impedance of 5(2Bi2O3-V2O5)-95SrB4O7 glass measured with impedance spectroscopy method at high temperature region
Open Research DataThe linear electrcial properties of 5(2Bi2O3-V2O5)-95SrB4O7 glass was measured by impedance spectroscopy method.
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Linear impedance of Bi2VO5.5 ceramic of thickness 2.52 mm measured with impedance spectroscopy method at low temperature region
Open Research DataThe linear electrical properties of Bi2VO5.5 ceramic of thickness 2.52 mm was measured by impedance spectroscopy method.
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Strength analysis of the support structure of the offshore wind turbine
PublicationThe global power demand from renewable sources is growing. One of a very favorable solution which meets severe environmental protection requirements are the offshore wind turbines. The offshore wind energy sector has experienced very fast development over last decade. Offshore wind farms, in comparison with onshore applications, can provide increased efficiency with reduced noise, visual, transportation and installation con-flicts....
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Testing impedance analyzer with potentiostat using RC model with Si diode at 200 mV
Open Research DataThe dataset presents impedance spectrum non-linear RC model with diode presented in the figure below. This model was used as a test engine of the impedance analyzer with potentiostat described in the referenced paper. When changing the DC polarisation of the model the non-linear phenomena could be observed. Thanks to this, the model can be used as a...
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Testing impedance analyzer with potentiostat using RC model with Si diode at 0 V
Open Research DataThe dataset presents impedance spectrum non-linear RC model with diode presented in the figure below. This model was used as a test engine of the impedance analyzer with potentiostat described in the referenced paper. When changing the DC polarisation of the model the non-linear phenomena could be observed. Thanks to this, the model can be used as a...
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Testing impedance analyzer with potentiostat using RC model with Si diode at 600 mV
Open Research DataThe dataset presents impedance spectrum non-linear RC model with diode presented in the figure below. This model was used as a test engine of the impedance analyzer with potentiostat described in the referenced paper. When changing the DC polarisation of the model the non-linear phenomena could be observed. Thanks to this, the model can be used as a...
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Testing impedance analyzer with potentiostat using RC model with Si diode at 400 mV
Open Research DataThe dataset presents impedance spectrum non-linear RC model with diode presented in the figure below. This model was used as a test engine of the impedance analyzer with potentiostat described in the referenced paper. When changing the DC polarisation of the model the non-linear phenomena could be observed. Thanks to this, the model can be used as a...
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EM-Driven Size Reduction and Multi-Criterial Optimization of Broadband Circularly-Polarized Antennas Using Pareto Front Traversing and Design Extrapolation
PublicationMaintaining small size has become an important consideration in the design of contemporary antenna structures. In the case of broadband circularly polarized (CP) antennas, miniaturization is a challenging process due to the necessity of simultaneous handling of electrical and field properties (reflection, axial ratio, gain), as well as ensuring sufficient frequency range of operation, especially at the lower edge of the antenna...
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Single and Series of Multi-valued Decision Diagrams in Representation of Structure Function
PublicationStructure function, which defines dependency of performance of the system on performance of its components, is a key part of system description in reliability analysis. In this paper, we compare two approaches for representation of the structure function. The first one is based on use of a single Multi-valued Decision Diagram (MDD) and the second on use of a series of MDDs. The obtained results indicate that the series of MDDs...
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Silicon microcantilever with impedance sensor
Open Research DataThe issue of microelectromechanical systems (MEMS) [1] has been enjoying popularity and interest since the 90s of the 20th century. Microcells are one of the simplest devices of this type, but they can be widely used in sensors. There are reports on the possibility of using this type of sensors in the context of such important issues as diagnostics...
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The influence of small intestinal mucus structure on particle transport ex vivo
PublicationMucus provides a barrier to bacteria and toxins while allowing nutrient absorption and waste transport. Unlike colonic mucus, small intestinal mucus structure is poorly understood. This study aimed to provide evidence for a continuous, structured mucus layer and assess the diffusion of different sized particles through it. Mucus structure was assessed by histology and immunohistochemistry. Ultra-structure was assessed by scanning...
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Nonlinear impedance of as-quenched 40Bi2VO5.5-60SrB4O7 glass measured with impedance spectroscopy method at high temperature region
Open Research DataThe nonlinear electrical properties of as-quenched 40Bi2VO5.5-60SrB4O7 glass was measured by impedance spectroscopy method.
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Mixed-ligand complexes of zinc(II), cobalt(II) and cadmium(II) with sulfur, nitrogen and oxygen ligands. Analysis of the solid state structure and solution behavior. Implications for metal ion substitution in alcohol dehydrogenase
PublicationScharakteryzowano strukturę heteroleptycznych kompleksów cynku(II), kobaltu(II) i kadmu(II) z 2-(2'-hydroksyetylopirydyną), tri-tert-butoksysilanotiolem i metanolem. Przy pomocy widm UV-Vis i NMR stwierdzono szybką wymianę N-liganda w roztworach tych kompleksów. Wyznaczono przesunięcia 15N NMR 2-(2'-hydroksyetylopirydyny) w kompleksach cynku(II) i kadmu(II). Na podstawie widm w podczerwieni i obliczeń DFT oszacowano względną moc...
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Nonlinear impedance of 5(2Bi2O3-V2O5)-95SrB4O7 glass measured with impedance spectroscopy method at high temperature region
Open Research DataThe nonlinear electrcial properties of 5(2Bi2O3-V2O5)-95SrB4O7 glass was measured by impedance spectroscopy method.
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Linear impedance of as-quenched 40Bi2VO5.5-60SrB4O7 glass measured with impedance spectroscopy method at low temperature region
Open Research DataThe linear electrcial properties of 40Bi2VO5.5-60SrB4O7 glass was measured by impedance spectroscopy method.
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Influence of processing conditions on crystal structure of BiNbO 4 ceramics
PublicationBismuth niobate (BiNbO4) has attracted attention as a low-fired ceramics with promising microwave application potential. It belongs to the bismutocolumbite oxides with similarly to scheelite-like stibiotantalite structure (SbTaO4) A3+B5+O4. Aim of the present research was to fabricate BiNbO4 ceramics by solid state reaction route from the mixture of simple oxides viz. Bi2O3, and Nb2O5, and study its phase composition as well as...
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Low-Cost Quasi-Global Optimization of Expensive Electromagnetic Simulation Models by Inverse Surrogates and Response Features
PublicationConceptual design of contemporary high-frequency structures is typically followed by a careful tuning of their parameters, predominantly the geometry ones. The process aims at improving the relevant performance figures, and may be quite expensive. The reason is that conventional design methods, e.g., based on analytical or equivalent network models, often only yield rough initial designs. This is especially the case for miniaturized...
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Quality of Service in ASON/GMPLS Network with Hierarchical Control Plane Structure
PublicationThe paper presents the problem of quality of service for hierarchical control plane structure of Automatically Switched Optical Network (ASON) utilizing Generalized Multi-Protocol Label Switching (GMPLS). The approach is implemented to control the multidomain network with required quality of service, in a use case of incomplete domain network information. The authors examine different factors, including resource reservation algorithms...
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Comprehensive dimension scaling of multi-band antennas for operating frequencies and substrate parameters
PublicationIn this paper, low-cost and comprehensive redesign of multi-band antennas with respect to the operating frequencies and material parameters of the substrate is presented. Our approach exploits an inverse surrogate model identified based on a set of reference designs optimized at the level of coarse-discretization EM simulations of the antenna at hand. An iterative correction procedure is also implemented to account for the initial...
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Combinatorial Pattern Matching
Conferences