Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "ion current" wg kryterium: Temat

  Lista filtrów
Wyrównaj
    Wyświetlanie 1-12 z 12
    Tytuł:
    Application of Ion Current Measurement to Identification of Combustion Parameters in a Homogeneous Charge Compression Ignition Engine
    Autorzy:
    Hunicz, J.
    Filipek, P.
    Sobiesiak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/221670.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    HCCI
    ion current
    heat release rate
    combustion control
    Opis:
    This study examines the application of ion current measurements to the identification of heat release parameters inside the combustion chamber of a homogeneous charge compression ignition (HCCI) engine fuelled with gasoline. HCCI combustion was achieved with the use of exhaust gas trapping. Combustion parameters derived from the in-cylinder pressure and ion current measurements were compared and analysed. Ion current measurements were accomplished using the existing spark plug and a dedicated electronic circuit. The experiments were performed at a variable excess air ratio and a variable amount of trapped residuals. The results showed a good correlation between peak values of the ion current and heat release rate, except for the cases where a fuel-rich mixture was burnt. The computed ion current integral over the volume of the combustion chamber showed a good agreement with the heat released in the combustion chamber, however this parameter was found to be affected by the amount of trapped residuals. Combustion timing characteristic values computed using heat release and ion current were found to be correlated, however the relationship was not linear.
    Źródło:
    Metrology and Measurement Systems; 2018, 25, 1; 223-234
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transistor Effect in the Cochlear Amplifier
    Autorzy:
    Kiełczyński, P.
    Szalewski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/178149.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cochlear amplifier
    acoustoelectric transducers
    electromechanical transistor
    equivalent circuits
    field effect transistors
    ion current
    Opis:
    The paper presents a new electromechanical amplifying device i.e., an electromechanical biological transistor. This device is located in the outer hair cell (OHC), and constitutes a part of the Cochlear amplifier. The physical principle of operation of this new amplifying device is based on the phenomenon of forward mechanoelectrical transduction that occurs in the OHC’s stereocilia. Operation of this device is similar to that of classical electronic Field Effect Transistor (FET). In the considered electromechanical transistor the input signal is a mechanical (acoustic) signal. Whereas the output signal is an electric signal. It has been shown that the proposed electromechanical transistor can play a role of the active electromechanical controlled element that has the ability to amplify the power of input AC signals. The power required to amplify the input signals is extracted from a battery of DC voltage. In the considered electromechanical transistor, that operates in the amplifier circuit, mechanical input signal controls the flow of electric energy in the output circuit, from a battery of DC voltage to the load resistance. Small signal equivalent electrical circuit of the electromechanical transistor is developed. Numerical values of the electrical parameters of the equivalent circuit were evaluated. The range, which covers the levels of input signals (force and velocity) and output signals (voltage, current) was determined. The obtained data are consistent with physiological data. Exemplary numerical values of currents, voltages, forces, vibrational velocities and power gain (for the assumed input power levels below 1 picowatt (〖10〗^(-12) W), were given. This new electromechanical active device (transistor) can be responsible for power amplification in the cochlear amplifier in the inner ear.
    Źródło:
    Archives of Acoustics; 2014, 39, 1; 117-124
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza wrażliwościowa spektrometru mas z innowacyjnym układem polaryzacji źródła elektronów
    Sensitivity analysis of mass spectrometer with innovative biasing system ofin an electron source
    Autorzy:
    Sikora, J.
    Szczepaniak, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/155334.pdf
    Data publikacji:
    2012
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    wrażliwość
    spektrometr mas
    układ polaryzacji
    prąd emisji elektronowej
    napięcie przyśpieszające
    sensitivity
    mass spectrometer
    biasing system
    ion current
    electron emission current
    accelerating voltage
    Opis:
    Praca prezentuje wyniki badań wrażliwości spektrometru mas z nowatorskim układem polaryzacji źródła elektronów, zapewniającym niezależny dobór natężenia prądu emisji elektronowej i napięcia przyśpieszającego elektrony. Dzięki takiemu rozwiązaniu możliwe jest wyznaczenie wrażliwości natężenia prądu jonowego niezależnie względem natężenia prądu emisji elektronowej i napięcia przyśpieszającego elektrony. Badania objęły również pozostałe charakterystyki spektrometru mas oraz wrażliwości natężenia prądu jonowego względem ciśnienia i napięcia przyspieszającego jony. Wyniki potwierdzają zalety nowego rozwiązania w spektrometrze mas.
    The sensitivity measurement results of a mass spectrometer (Fig. 1) with an innovative biasing system in an electron source [1] are presented. The biasing system ensures that an accelerating voltage and an electron emission current are independent of each other. Owing to that, the sensitivity of an ion current versus the electron emission current (Fig. 2), and independently versus the electron accelerating voltage (Fig. 3) can be determined. The researches included the determination of the mass spectrometer characteristics and sensitivity of the ion current in function of a pressure (Fig. 4.) and the ion current in function of an ion accelerating voltage (Fig. 5, Fig. 6). The results confirm that new biasing system is highly suitable for the mass spectrometer.
    Źródło:
    Pomiary Automatyka Kontrola; 2012, R. 58, nr 3, 3; 256-259
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Relations between ion signal and flame propagation in cylinder of a rapid compression machine
    Autorzy:
    Fiedkiewicz, Łukasz
    Pielecha, Ireneusz
    Powiązania:
    https://bibliotekanauki.pl/articles/133907.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    ion current
    flame speed
    high speed camera
    rapid compression machine
    prąd jonowy
    prędkość płomienia
    szybka kamera wideo
    maszyna pojedynczego sprężu
    Opis:
    Internal combustion engine diagnostics using traditional methods of cylinder pressure signal processing limits the amount of information available about the combustion process. It is necessary to conduct research in order to obtain more precise information - in-creasing the combustion process diagnosis potential. One such suggestion is the use of an ionization signal and an attempt to link it to the flame development during combustion of gaseous fuels. The article attempts to identify such a relationship using a rapid compression machine due to optical access it provides to the combustion chamber. As a result of the research, the relationships between the ionization voltage (chemical and thermal) of the first combustion phase and the corresponding flame development rates were determined. A relatively high coefficient of determination value was obtained for both relations, which indicates the possibility of obtaining diagnostic information about the combustion process from the ionization signal.
    Źródło:
    Combustion Engines; 2019, 58, 4; 264-268
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Liquid chromatographic techniques in separation of betacyanins and their derivatives from red beet roots
    Autorzy:
    Spórna, A.
    Stalica, P.
    Jerz, G.
    Szaleniec, M.
    Wybraniec, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/115819.pdf
    Data publikacji:
    2010
    Wydawca:
    Fundacja na Rzecz Młodych Naukowców
    Tematy:
    betanin
    betalains
    betacyanins
    ion-pair counter-current chromatography
    perfluorinated carboxylic acids
    Opis:
    A study on separation of betacyanins and their decarboxylated as well as dehydrogenated derivatives obtained from red beet roots (Beta vulgaris L.) in high pressure liquid chromatography (HPLC) and ion-pair high-speed counter-current chromatography (IP-HSCCC) was performed. The IP-HSCCC process was accomplished in the ‘head-to-tail’ mode in a solvent system composed of butanol — acetonitrile — water (5:1:6 v/v/v, acidifi ed with 0.7% trifl uoroacetic acid). The HPLC separation was performed in a typical reversed phase mode with mass spectrometry (ESI-MS) and diode-array (DAD) detection. The chromatographic profi les of betalains obtained in these two techniques were signifi cantly diff erent. In HPLC, the most polar compounds, like betanin and isobetanin, eluted before less polar decarboxylated and dehydrogenated derivatives (mostly degradation products of betanin). In IP-HSCCC, the dehydrogenated derivatives were eluted faster then their non-dehydrogenated analogues. It was observed for the fi rst time that betanin and neobetanin (14,15-dehydrogenated betanin), which are present in many plants containing betalains, had reversed elution orders during chromatographic separation by these two techniques.
    Źródło:
    Challenges of Modern Technology; 2010, 1, 1; 19-22
    2082-2863
    2353-4419
    Pojawia się w:
    Challenges of Modern Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nanopory : budowa, właściwości, modele, zastosowania
    Nanopores : structure, properties, models, app lications
    Autorzy:
    Stachiewicz, A.
    Molski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/171558.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    nanopory
    prąd jonowy
    translokacja biopolimerów
    równanie Poissona-Boltzmanna
    równanie Poissona-Nernsta-Plancka
    dynamika molekularna
    nanopores
    ion current
    biopolymer translocation
    Poisson-Boltzmann
    equation
    Poisson-Nernst-Planck equation
    molecular dynamics
    Opis:
    Nanopores are small (1–100 nm diameter) holes/channels formed in biological membranes (Fig. 1) or fabricated in synthetic materials (Fig. 2). Permeation of ions and small molecules through nanopores is common in biological systems. The first experiments where nanopores were used as single-molecule sensors were performed in the 90s [1, 2]. The detection principle is based on a monitoring of an ionic current passing through a nanopore as an electric field is applied across the membrane. Electrically charged particles (e.g. DNA ) move in the electric field and block the ionic current as they pass through the nanopore. A sudden drop of the ionic current signals a single-molecule translocation event (Fig. 3–5). Nanopore sensors can give an information about the analyte: its size, structure and bonds stability. Today, a major topic of interest is the possibility of nanopore DNA sequencing. In this work we present an introduction to nanopore technology and to current research related to potential nanopore applications. First, we describe biological and synthetic nanopores: their structure and methods of fabrication. Next, different modes of nanopore experiments are presented. In the third section, we focus on theoretical models and simulations of nanopores. Finally, we present future perspectives for applications with particular reference to DNA sequencing.
    Źródło:
    Wiadomości Chemiczne; 2013, 67, 3-4; 277-302
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Leakage Current Degradation Due to Ion Drift and Diffusion in Tantalum and Niobium Oxide Capacitors
    Autorzy:
    Kuparowitz, M.
    Sedlakova, V.
    Grmela, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/221515.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    niobium oxide capacitors
    tantalum capacitors
    leakage current
    ion diffusion
    ion drift
    Opis:
    High temperature and high electric field applications in tantalum and niobium capacitors are limited by the mechanism of ion migration and field crystallization in a tantalum or niobium pentoxide insulating layer. The study of leakage current (DCL) variation in time as a result of increasing temperature and electric field might provide information about the physical mechanism of degradation. The experiments were performed on tantalum and niobium oxide capacitors at temperatures of about 125°C and applied voltages ranging up to rated voltages of 35 V and 16 V for tantalum and niobium oxide capacitors, respectively. Homogeneous distribution of oxygen vacancies acting as positive ions within the pentoxide layer was assumed before the experiments. DCL vs. time characteristics at a fixed temperature have several phases. At the beginning of ageing the DCL increases exponentially with time. In this period ions in the insulating layer are being moved in the electric field by drift only. Due to that the concentration of ions near the cathode increases producing a positively charged region near the cathode. The electric field near the cathode increases and the potential barrier between the cathode and insulating layer decreases which results in increasing DCL. However, redistribution of positive ions in the insulator layer leads to creation of a ion concentration gradient which results in a gradual increase of the ion diffusion current in the direction opposite to the ion drift current component. The equilibrium between the two for a given temperature and electric field results in saturation of the leakage current value. DCL vs. time characteristics are described by the exponential stretched law. We found that during the initial part of ageing an exponent n = 1 applies. That corresponds to the ion drift motion only. After long-time application of the electric field at a high temperature the DCL vs. time characteristics are described by the exponential stretched law with an exponent n = 0.5. Here, the equilibrium between the ion drift and diffusion is achieved. The process of leakage current degradation is therefore partially reversible. When the external electric field is lowered, or the samples are shortened, the leakage current for a given voltage decreases with time and the DCL vs. time characteristics are described by the exponential stretched law with an exponent n = 0.5, thus the ion redistribution by diffusion becomes dominant.
    Źródło:
    Metrology and Measurement Systems; 2017, 24, 2; 255-264
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reduction of Microalgae by Copper Ion in Impressed Current Anti Fouling System for Biofouling Prevention in Saline Environment
    Autorzy:
    Pratikno, Herman
    Titah, Harmin Sulistiyaning
    Handayanu, -
    Powiązania:
    https://bibliotekanauki.pl/articles/952426.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    biocorrosion
    biofouling
    impressed current antifouling
    copper ion
    microalgae
    Opis:
    The biofouling causes corrosion in marine environment, also known as the biological corrosion. The biological corrosion occurs in the metal material on coastal buildings, offshore buildings, port buildings and shipboard. One method to prevent the biological corrosion is ICAF (Impressed Current Anti-Fouling). The study on the microalgae that cause biofouling was conducted in laboratory scale using a simple ICAF system. The variables were the operating time of the simple ICAF system, the strength of the electric current and the species of microalgae. The determination of cell number of microalgae was conducted using a Neubauer improved Hemocytomete method, while determination of the concentration of Cu ion was conducted using Atomic Absorption Spectrophotometry (AAS). The aim of the research was to determine of microalgae, Isochrysis galbana and Botryococcus sp, population reduction using ICAF system. On the basis of the results, the highest population reduction occurred in Isochrysis galbana and Botryococcus sp reaching 77.5% and 50%, respectively. The highest concentration of Cu that was produced during the operation of the simple ICAF system reached 4.08 ± mg/L. In conclusion, ion Cu that was produced during the operation of the simple ICAF system can reduce the cell number of Isochrysis galbana and Botryococcus sp.
    Źródło:
    Journal of Ecological Engineering; 2020, 21, 2; 80-87
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Novel Method of Improving Electrical Properties of Thin PECVD Oxide Films by Fluorination of Silicon Surface Region by RIE in RF CF4 Plasma
    Autorzy:
    Kalisz, M.
    Głuszko, G.
    Beck, R. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/308057.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    capacitance-voltage characteristics
    current-voltage characteristics
    fluorine plasma
    radio frequency reactive ion etching
    Opis:
    This study describes a novel technique to form good quality low temperature oxide (< 350 C degree). Low temperature oxide was formed by N2O + SiH4:N2 plasma in a plasma enhanced chemical vapour deposition (PECVD) system on the silicon surface reactively etched in CF4 plasma (RIE - reactive ion etching). The fabricated oxide demonstrated excellent (for low temperature dielectric formation process) currentvoltage (I-V) characteristics, such as: low leakage current, high breakdown voltage and good reliability. Experimental results indicate that the proposed method of fluorine incorporation into the SiO2/Si inteface improves electrical parameters of MOS structures.
    Źródło:
    Journal of Telecommunications and Information Technology; 2010, 1; 20-24
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Direct current and pulsed direct current plasma nitriding of ferrous materials a critical review
    Autorzy:
    Łępicka, M.
    Grądzka-Dahlka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/386438.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    plasma nitriding
    ion nitriding
    direct current plasma nitriding
    pulsed direct current
    edge effect
    azotowanie plazmowe
    azotowanie jonowe
    prąd stały impulsowy
    Opis:
    Nowadays, the improvement of ferrous materials performance is a problem of high interest. One of well-known wear- and corrosion properties improving technique is plasma nitriding, in which elemental nitrogen is introduced to the surface of a metal part for subsequent diffusion into the material. As a result, a compound, “white” layer and a diffusion zone are formed at the detail’s surface. Most of the authors positively describe the effects of surface ion nitiding. On the other hand, there are also reports on adverse effects of direct current and pulsed direct current plasma nitriding on ferrous materials performance. Therefore, an attempt to provide comprehensive summary on direct current and pulsed direct current ion nitriding and its influence on ferrous materials’ mechanical and corrosion properties has been made. According to the results, some of the technique drawbacks are hard to avoid in mass production.
    Źródło:
    Acta Mechanica et Automatica; 2016, 10, 2; 150-158
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of High Temperature Annealing on Fluorine Distribution Profile and Electro-Physical Properties of Thin Gate Oxide Fluorinated by Silicon Dioxide RIE in CF4 Plasma
    Autorzy:
    Kalisz, M.
    Głuszko, G.
    Beck, R. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/308059.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    capacitance-voltage characteristics
    current-voltage characteristics
    fluorine plasma
    high temperature annealing process
    radio frequency reactive ion etching
    Opis:
    This study describes the effects of high temperature annealing performed on structures fluorinated during initial silicon dioxide reactive ion etching (RIE) process in CF4 plasma prior to the plasma enhanced chemical vapour deposition (PECVD) of the final oxide. The obtained results show that fluorine incorporated at the PECVD oxide/Si interface during RIE is very stable even at high temperatures. Application of fluorination and high temperature annealing during oxide layer fabrication significantly improved the properties of the interface (Ditmb decreased), as well as those of the bulk of the oxide layer (Qeff decreased). The integrity of the oxide (higher Vbd ) and its uniformity (Vbd distribution) are also improved.
    Źródło:
    Journal of Telecommunications and Information Technology; 2010, 1; 25-28
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Elektrody jonoselektywne – klasyka i nowe koncepcje
    Ion-selective electrodes – classical systems and new ideas
    Autorzy:
    Maksymiuk, K.
    Michalska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/143070.pdf
    Data publikacji:
    2015
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Przemysłu Chemicznego. Zakład Wydawniczy CHEMPRESS-SITPChem
    Tematy:
    elektrody jonoselektywne
    potencjometria
    uproszczenia konstrukcyjne
    obniżenie granicy wykrywalności
    nanocząstki
    metody prądowe
    ion-selective electrodes
    potentiometry
    construction simplification
    detection limit lowering
    nanoparticles
    electrochemical current based techniques
    Opis:
    Artykuł dotyczy tendencji rozwojowych elektrod jonoselektywnych stosowanych w potencjometrii. Przedstawiono typowe rozwiązania stosowane w praktyce, a także opisano główne kierunki badań dotyczących tej grupy sensorów, związanych zarówno z uproszczeniami konstrukcji, jak i poprawą parametrów analitycznych. Scharakteryzowano też nowe możliwości analityczne uzyskiwane dla takich elektrod w warunkach polaryzacji prądowej.
    The article concerns trends in development of ion-selective electrodes used in potentiomeric analysis, it shows typical practical solutions and describes main trends of research concerning this group of sensors, oriented both to construction simplification and improvement of analytical parameters. New analytical advantages, achieved under conditions of galvanostatic polarization, were also described.
    Źródło:
    Chemik; 2015, 69, 7; 373-382
    0009-2886
    Pojawia się w:
    Chemik
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

      Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies