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    Wyświetlanie 1-28 z 28
    Tytuł:
    The Influence of the Microwave Power on Josephson Microwave Absorption in High- Temperature Superconductors
    Autorzy:
    Czyżak, B.
    Stankowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1887983.pdf
    Data publikacji:
    1991-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.50.+r
    74.70.Vy
    Opis:
    The influence of the microwave power on the internal Josephson Junction System (JJS) in granular high T$\text{}_{c}$, superconductors was investigated using EPR methodology. Josephson Microwave Absorption signal was used to monitor local temperature of the Josephson Junction System while the bulk sample temperature was measured by a thermocouple. The effect of the JJS overheating is discussed as the consequence of an interaction between JJS, microwave field and the bulk sample.
    Źródło:
    Acta Physica Polonica A; 1991, 80, 1; 99-106
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of microwave power on EPR spectra of thermally sterilized eucerinum anhydricum
    Autorzy:
    Ramos, P.
    Pepliński, P.
    Pilawa, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/148715.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    EPR
    microwave saturation
    free radicals
    eucerinum anhydricum
    thermal sterilization
    Opis:
    Free radicals formed during thermal sterilization of eucerinum anhydricum – the pharmaceutical base were examined by an X-band (9.3 GHz) spectrometer. Eucerinum anhydricum was sterilized at different physical conditions according to the Polish Pharmacopeia norms. The samples were heated at temperatures: 160°C (120 min), 170°C (60 min), and 180°C (30 min). The aim of this study is to compare free radical concentration and effect of microwave power on EPR spectra of eucerinum anhydricum base thermally sterilized at different temperatures and periods of time. The effect of time storage on the free radicals in the heated samples was tested. Free radical concentrations in the sample stored 15 min strongly decreased with the increasing of sterilization temperature, probably as the result of recombination. Storage caused strong decrease of free radical concentrations in the samples, probably as the result of interactions with oxygen. It was observed to be independent of sterilization conditions from 2 days of storage and longer. Because of the lowest free radical concentration, for eucerinum anhydricum thermal sterilization at 180°C for 30 min is recommended. The sterilized samples should be stored at inert atmosphere without oxygen molecules. Fast spin-lattice relaxation processes existed in sterilized eucerinum anhydricum. The character of changes of amplitudes and linewidths of EPR lines with increasing of microwave power was the same for different storage times. The parameters of thermal sterilization and storage time influenced free radical concentration in eucerinum anhydricum, but magnetic spin-lattice interactions were unchanged. The usefulness of EPR spectroscopy in optimization of thermal sterilization process of eucerinum anhydricum was confirmed.
    Źródło:
    Nukleonika; 2015, 60, No. 3, part 1; 439-442
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Josephson Network as a Model for Inhomogeneous Superconductor: a Microwave Power Absorption
    Autorzy:
    Rycerz, A.
    Spałek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047320.pdf
    Data publikacji:
    2007-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.81.Fa
    74.25.Nf
    Opis:
    We discuss the applied magnetic field dependence of the microwave absorption by a three-dimensional array of up to 30×30 ×30 Josephson junctions with random parameters including the resistivity, capacity, and inductance of each junction. The numerical simulation results for the networks show characteristic microwave absorption anomalies observed in the ceramic samples of high temperature superconductor YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-x}$. We also provide a discussion of the absorption in simple analytical terms of the Josephson loop instabilities.
    Źródło:
    Acta Physica Polonica A; 2007, 111, 4; 581-594
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of microwave power on EPR spectra of natural and synthetic dental biocompatible materials
    Autorzy:
    Adamczyk, J.
    Ramos, P.
    Pilawa, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/147235.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    EPR
    microwave saturation
    paramagnetic centers
    dental biocompatible materials
    Opis:
    Paramagnetic centers in the two exemplary synthetic and natural dental biocompatible materials applied in implantology were examined by the use of an X-band (9.3 GHz) electron paramagnetic resonance (EPR) spectroscopy. The EPR spectra were measured in the range of microwave power 2.2–70 mW. The aims of this work were to compare paramagnetic centers concentrations in different dental biocompatible materials and to determine the effect of microwave power on parameters of their EPR spectra. It is the very fi rst and innovatory examination of paramagnetic centers in these materials. It was pointed out that paramagnetic centers existed in both natural (~1018 spin/g) and synthetic (~1019 spin/g) dental biocompatible materials, but the lower free radical concentration characterized the natural sample. Continuous microwave saturation of EPR spectra indicated that faster spin-lattice relaxation processes existed in synthetic dental biocompatible materials than in natural material. Linewidths (ΔBpp) of the EPR spectra of the natural dental material slightly increased for the higher microwave powers. Such effect was not observed for the synthetic material. The broad EPR lines (ΔBpp): 2.4 mT, 3.9 mT, were measured for the natural and synthetic dental materials, respectively. Probably strong dipolar interactions between paramagnetic centers in the studied samples may be responsible for their line broadening. EPR spectroscopy is the useful experimental method in the examination of paramagnetic centers in dental biocompatible materials.
    Źródło:
    Nukleonika; 2015, 60, No. 3, part 1; 449-453
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling and Design of a Highly Efficient Switch-Mode RF/Microwave Power Amplifier Based-on Microstrip Bandpass Filter
    Autorzy:
    Moloudi, Farzad
    Eslamipour, Omid
    Khoshnoud, Ali
    Powiązania:
    https://bibliotekanauki.pl/articles/2200707.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    broadband
    band-pass filter (BPF)
    switch-mod
    power amplifier (PA)
    matching network (MN)
    Opis:
    This paper presents a broadband Switch-Mode Power Amplifier (SMPA) using a Band-Pass Filter (BPF) at the Output Matching Network (OMN). The proposed SMPA integrates a microstrip BPF as an output impedance matching network to significantly reduce the final circuit size. The microstrip lines of the filter simultaneously play the role of filtering and impedance matching. This proposed method reduces the size of the PA and reduces the power dissipation as much as possible. The BPF is placed at the output of the circuit using microstrip lines and the RT Duroid 6006 substrate. This BPF covers a wide bandwidth ranging from 3.0 GHz to 4.4 GHz. Simulation results show 9-14 dB gain with 44 - 56.6 % drain efficiency ( DE %), and the output power of 39 – 41.3 dBm would be achieved across the frequency band from 3.0 GHz to 4.4 GHz.
    Źródło:
    International Journal of Electronics and Telecommunications; 2022, 68, 4; 775--781
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Microwave Power on EPR Signal of Melanin Radical and Copper(II) Ions in DOPA-Melanin Complexes
    Autorzy:
    Najder-Kozdrowska, L.
    Pilawa, B.
    Więckowski, A.
    Buszman, E.
    Wrześniok, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399522.pdf
    Data publikacji:
    2013-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.30.Rn
    87.80.Lg
    87.64.kh
    Opis:
    Electron paramagnetic resonance spectroscopy EPR was used for examination of microwave saturation in DOPA-melanin complexes with kanamycin and Cu(II) ions. The fast spin-lattice relaxation processes take place in system of paramagnetic metal ions. EPR signal of melanin radical saturated with growing of microwave power used during measurements. After adding Cu(II) ions a shortening of relaxation time is observed for EPR signal of melanin radical.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 1; 112-114
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Developing RF Power Sensor Calibration Station in Direct Comparison Transfer System using Vector Network Analyzer
    Autorzy:
    Szatkowski, Jarosław
    Powiązania:
    https://bibliotekanauki.pl/articles/1839334.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    direct comparison transfer
    microwave power measurement
    power sensor calibration
    measurement uncertainty
    VNA
    Opis:
    Calibration of RF power sensors is crucial issue in RF power measurements. Many calibration laboratories use the direct comparison transfer system with a signal generator and a power splitter. Increasing performance of modern vector network analyzers makes it possible to perform a power sensor calibration with acceptable uncertainties. The main advantage when using a VNA is a simple measurement setup with a wide frequency range (up to 50 GHz, limited only by the VNA and the standard power sensor), where all of required components, i.e. signal generator, a directional coupler and a reference power indicator are built in the VNA technology. This paper reports performing a VNA-based RF power sensors calibration for 10 MHz – 18 GHz band, carried out in the Laboratory of Electric, Electronic and Optoelectronic Metrology at the National Institute of Telecommunications in Warsaw, Poland. In order to validate the proposed solution two of power sensors were calibrated at a reference laboratory. The validation consisted of two steps. At first, one of those characterized power sensors was calibrated at our laboratory in direct comparison transfer system. Finally, the results obtained from the VNA-based system were compared with the previously obtained ones.
    Źródło:
    Journal of Telecommunications and Information Technology; 2021, 3; 18-22
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of microwave power on EPR spectra of DOPA-melanin-netilmicin complexes with different drug concentrations : a study at temperatures in the range of 125-275 K
    Autorzy:
    Zdybel, M.
    Pilawa, B.
    Buszman, E.
    Wrześniok, D.
    Krzyminiewski, R.
    Kruczyński, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/146482.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    DOPA-melanin
    electron paramagnetic resonance (EPR) spectroscopy
    free radicals
    netilmicin
    Opis:
    Electron paramagnetic resonance (EPR) spectra of the model eumelanin – DOPA-melanin complexes with netilmicin measured with a microwave power in the range 0.3–200 mW were examined. The influence of microwave power on amplitudes (A) and linewidths (ΔBpp) of the spectra was determined. The EPR spectra were recorded by a BRUKER spectrometer at temperatures 125, 175, 225 and 275 K. Continuous microwave saturation of EPR lines was used to compare the acceleration of spin-lattice relaxation processes in melanin samples. Changes of the parameters of the EPR spectra of DOPA-melanin-netilmicin complexes, with the microwave power for the samples differing in netilmicin concentrations, were observed. The effect of temperature on the changes of the EPR spectra of the analyzed melanin complexes with the microwave power was determined. The spin-lattice relaxation is faster at higher temperatures for all the tested melanin complexes.
    Źródło:
    Nukleonika; 2013, 58, 3; 407-411
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Investigation of Low Power Microwave Microplasma Source
    Autorzy:
    Czylkowski, D.
    Hrycak, B.
    Jasiński, M.
    Mizeraczyk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1198978.pdf
    Data publikacji:
    2014-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.50.Dg
    52.70.Ds
    52.70.Kz
    52.80.Pi
    Opis:
    The aim of this paper is to present a novel microwave microplasma source generated in different gases at atmospheric pressure. The design, rule of operation and experimental investigations of the new microwave microplasma source are described. The main advantage of the presented microwave microplasma source is its small size, simplicity, and low cost of construction and operation. The microplasma has a form of a small plasma jet of dimensions of a few mm, depending on the kind of gas, gas flow rate, and absorbed microwave power. Presented in this paper results of experimental investigations were obtained with an atmospheric pressure argon, krypton, nitrogen, and air microplasma, sustained by microwaves of standard frequency of 2.45 GHz. The absorbed microwave power was up to 70 W. The gas flow rate was from 2 to 25 l/min. The miniature size, simplicity of the source and stability of the microplasma allow to conclude that the presented new microwave microplasma source can find practical applications in various fields.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 6; 1323-1325
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Use of Osmotic Dehydration and Microwave-Vacuum Drying for the Production of Apple Snacks®
    Zastosowanie odwadniania osmotycznego i suszenia mikrofalowopróżniowego do wytwarzania przekąsek z jabłek®
    Autorzy:
    Ignaczak, Anna
    Masiarz, Ewelina
    Kowalska, Jolanta
    Kowalska, Hanna
    Powiązania:
    https://bibliotekanauki.pl/articles/2171927.pdf
    Data publikacji:
    2022
    Wydawca:
    Wyższa Szkoła Menedżerska w Warszawie
    Tematy:
    dried fruits
    fruit snacks
    reduced pressure
    microwave power
    suszone owoce
    przekąski z owoców
    obniżone ciśnienie
    moc mikrofalowa
    Opis:
    The influence of time, microwave power, reduced pressure, and initial osmotic dehydration on selected indicators of microwave-vacuum drying of apple slices was investigated. 5 drying variants were used, differing in microwave power and pressure, and with osmotic treatment: A: 250 W / 3.5 kPa; B: 300 W / 3.5 kPa; C: 300 W / 5.5 kPa; D: 300 W / 6.5 kPa; E: 300 W / 6.5 kPa / initial osmotic dehydration. Apple drying was the most intensive in the case of variant B. Water activity of apples without pretreatment was at the level of 0.71-0.81, and initial osmotic dehydration caused a decrease to 0.52. All samples showed a darkening of the color and increased red color.
    Badano wpływ czasu, mocy mikrofal, obniżonego ciśnienia i wstępnego odwadniania osmotycznego na wybrane wskaźniki suszenia mikrofalowo-próżniowego jabłek. Zastosowano 5 wariantów suszenia różniących się mocą mikrofal i ciśnieniem oraz z obróbką osmotyczną: A: 250 W/3,5 kPa; B: 300 W/3,5 kPa; C: 300 W/5,5 kPa; D: 300 W/6,5 kPa; E: 300 W/6,5 kPa/ wstępne odwadnianie osmotyczne. Suszenie jabłek najintensywniej przebiegało w przypadku wariantu B. Aktywność wody jabłek bez wstępnej obróbki była na poziomie 0,71-0,81, a wstępne odwadnianie osmotyczne spowodowało obniżenie do 0,52. Obróbka osmotyczna wpłynęła istotnie na ograniczenie skurczu suszarniczego. Próbki odznaczały się pociemnieniem barwy i zwiększeniem udziału barwy czerwonej.
    Źródło:
    Postępy Techniki Przetwórstwa Spożywczego; 2022, 2; 42--48
    0867-793X
    2719-3691
    Pojawia się w:
    Postępy Techniki Przetwórstwa Spożywczego
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High power microwave for knocking out programmable suicide drones
    Autorzy:
    Chaari, Mohamed Zied
    Powiązania:
    https://bibliotekanauki.pl/articles/1311126.pdf
    Data publikacji:
    2021
    Wydawca:
    Akademia Sztuki Wojennej
    Tematy:
    high power microwave
    conical horn antenna
    errant drone
    kill drone
    high frequency
    Opis:
    The primary research objective is to reduce the dangers of rogue drones in our lives and the consequences of extremist groups, drug dealers, and organised criminals using them. The growing number of incidents involving modified drones proves the weakness of existing technology in stopping and neutralising errant drones such as the hand-held gun jammer, trained eagle, R.F. jammer, and others. This technology is not very likely to able to knock out a rogue drone and is incapable of stopping programmable drones. This article aims to examine the directed energy of HPM (high power microwaves) in using the electromagnetic field strength energy to damage the drone’s structure or burn its PCB board electronics. It goes on to analyse electronic attack using microwave power with high frequency to immediately switch off drones. The effectiveness of high microwave power for disrupting drones at different distances and in different weather conditions is evaluated. A study of the conical horn antenna of the magnetron coupling system, which has an operating frequency of 2.45 GHz, is also included.
    Źródło:
    Security and Defence Quarterly; 2021, 34, 2; 68-84
    2300-8741
    2544-994X
    Pojawia się w:
    Security and Defence Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Computer-controlled System of High-power Microwave Sources
    Autorzy:
    Korpas, P.
    Gryglewski, D.
    Wojtasiak, W.
    Gwarek, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/226529.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    SiC
    GaN
    high power amplifier
    PLL synthesizer
    microwave sources
    Opis:
    The paper presents the design and hardware implementation of a computer controlled system composed of up to four high-power microwave sources. Each source provides up to 200 W of continuous wave power. Frequency of each source is stabilized within ±0.5 ppm of the nominal frequency adjustable within 2.35÷2.6 GHz range. All four sources can be synchronized to the same frequency with computer-controlled phase shift between the signals generated by each of them. The paper concentrates on the choice of components for such a system and the properties of the realized hardware implementation.
    Źródło:
    International Journal of Electronics and Telecommunications; 2011, 57, 1; 121-126
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis and optimization of outputs of high power microwave tubes
    Autorzy:
    Węgrzyniak, P.
    Gwarek, W.
    Baczewski, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/307618.pdf
    Data publikacji:
    2007
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    high power microwave tubes
    optimization of outputs
    Opis:
    The subject of this work is optimization of outputs of L-band high power microwave tubes. These outputs are constructed as coaxial-to-waveguide transitions with a vacuum barrier in a form of glass or ceramic cup. The goal of optimization is to obtain sufficiently low reflection loss in the predefined frequency band and to avoid so called hot spots caused by excessive dissipation of microwave power in parts of the cup. Electromagnetic simulator has been applied to model the behavior of the optimized transition and to propose its optimum shape. The proposed solutions were verified by Z.E. Lamina SA in prototypes of high power (pulsed 600 kW) amplitrons and are to be used in manufacturing practice.
    Źródło:
    Journal of Telecommunications and Information Technology; 2007, 1; 35-39
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A six-port measurement device for high power microwave vector network analysis
    Autorzy:
    Kommey, Benjamin
    Addo, Ernest Ofosu
    Tamakloe, Elvis
    Tchao, Eric Tutu
    Nunoo-Mensah, Henry
    Akowuah, Bright Yeboah
    Powiązania:
    https://bibliotekanauki.pl/articles/38436703.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Promocji Wiedzy
    Tematy:
    vector network analyzer
    microwave device
    S-Band network
    reflection coefficient
    waveguide
    Opis:
    The changes experienced in technology due to the third industrial revolution have over the years contributed immensely to the development of efficient devices and systems. As a result, solutions have been provided to challenges encountered in the heating industry. However, higher efficiency and better performance has undoubtedly been highly sort after. This paper presents the complete industrial development of a new system of a microwave device for use in S-band networks (2.45 GHz ISM band in this application): a vector network analyzer (VNA). The VNA, which is designed based on the six-port measurement principle, provides accurate measurements of both magnitude and phase of the load reflection coefficient. The device is designed to have high power handling capabilities and works under the full operating conditions of high-power microwave generators. Initial measurements show that the device perform stable and can perform temperature-independent measurements over protracted periods. The system is suited for on-line monitoring and control of network parameters in industrial waveguide applications.
    Źródło:
    Applied Computer Science; 2022, 18, 3; 105-129
    1895-3735
    2353-6977
    Pojawia się w:
    Applied Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Resistive Sensor for Short High-Power Microwave Pulse Measurement in Millimeter Wave Range
    Autorzy:
    Tamošiūnas, V.
    Kancleris, Ž
    Dagys, M.
    Simniškis, R.
    Agee, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1177568.pdf
    Data publikacji:
    2005-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.20.Ht
    72.30.+q
    85.30.De
    Opis:
    We report on the numerical investigation of the resistive sensor for the 78-118 GHz range. A three-dimensional finite-difference time-domain method was applied to simulate the wave propagation within a waveguide segment with the semiconductor sensor attached to a wider wall of the wave-guide. The electric field distribution, voltage standing-wave ratio and the average electric field dependences on frequency have been determined for several sets of dimensions and specific resistances of the sample. It is demonstrated that a proper selection of the dimensions and specific resistance of the sample can compensate the waveguide dispersion and the decrease of the electron heating effect with frequency. Therefore, a nearly constant sensitivity of the sensor can be obtained for the entire frequency range.
    Źródło:
    Acta Physica Polonica A; 2005, 107, 2; 420-424
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Investigation of High Pulse Power Microwave Resistive Sensor with Flat Frequency Response
    Autorzy:
    Kancleris, Ž.
    Simniškis, R.
    Dagys, M.
    Tamošiūnas, V.
    Ragulis, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807940.pdf
    Data publikacji:
    2009-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.57.Kp
    72.20.Ht
    85.30.De
    Opis:
    Two types of resistive sensors with flat frequency response for microwave pulse power measurements in X-band rectangular waveguide WR-90 up to 100 kW were developed and experimentally investigated. The first type of the sensors demonstrates higher sensitivity and larger output signal, while the second one exhibits better linearity of the output signal. The experimental investigations revealed the sensitivity variation within ± 10% in 8.2-12.2 GHz frequency band.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 6; 1122-1124
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of an Ultra-Compact, Repetitive Marx Generator for High-Power Microwave Applications
    Autorzy:
    Bischoff, R.
    Charon, R.
    Duperoux, J.
    Martin, B.
    Pinguet, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807853.pdf
    Data publikacji:
    2009-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    84.30.Ng
    84.32.Hh
    84.32.Tt
    84.60.Ve
    Opis:
    The need for repetitive high-power microwave systems, for instance within the scope of convoy protection, requires the availability of compact, repetitive pulsed-power generators. The development and the first experimental results of an upgraded balanced ISL Marx generator for future repetitive operations at pulse repetition frequencies in the order of 100 Hz are introduced. A key objective is to keep the fundamental modular coaxial concept by reason of its scalability and compactness. Simulation models were developed under the PSpice software package in order to investigate the charging and discharging phases of the Marx generator and also to determine the design criteria for repetitive operations. The charging resistors were replaced by ultracompact inductors for rapid charging, being able to withstand pulsed voltages up to 60 kV and pulsed currents up to 1.4 kA during the discharge phase. An improved type of strontium-titanate high-voltage ceramic capacitor was successfully tested experimentally up to 70 kV. Each new elementary stage of the Marx generator consists of eight 1.1 nF sectors of a cylinder capacitors mounted in parallel, two charging inductors of about 17.8 μH and two halves of spherical spark gaps. The pressurized self-triggered gas switches are arranged along the axis for fast consecutive breakdown thanks to the UV radiation emitted during the breakdown in each gap. The stages are installed in individual fibreglass housings. First experimental results of a 4-stage Marx generator in repetitive operation, driven by a 4 kW capacitor charging power supply up to a maximum voltage of 40 kV, are presented.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 6; 964-966
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical control of semiconductor synchronized microwave oscillators in the power suppression mode
    Autorzy:
    Usanov, D.A.
    Skripal, A.V.
    Abramov, A.V.
    Powiązania:
    https://bibliotekanauki.pl/articles/309231.pdf
    Data publikacji:
    2003
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    synchronizacja
    sterowanie optyczne
    generator mikrofalowy
    dioda Gunna
    optical control
    synchronization
    semiconductor microwave oscillator
    Gunn diode
    Opis:
    The influence of optical radiation on the performance of the synchronized microwave Gunn-diode oscillator in the coherent signals subtraction mode has been described theoretically and investigated experimentally. The high sensitivity of the oscillator characteristics to the change of the optical intensity affecting the semiconductor diode structure has been shown. It is suggested to use this mode for the creation of optoelectronic microwave systems with the controlled amplitude and phase of the output signal and for the high-accuracy indication of optical radiation.
    Źródło:
    Journal of Telecommunications and Information Technology; 2003, 1; 30-35
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High Power Microwave Detection in Asymmetrically Shaped n-Al$\text{}_{x}$Ga$\text{}_{1-x}$As Structures
    Autorzy:
    Ašmontas, S.
    Čerškus, A.
    Gradauskas, J.
    Kundrotas, J.
    Lučun, A.
    Petkun, V.
    Sužiedėlis, A.
    Šilėnas, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2041762.pdf
    Data publikacji:
    2005-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.57.Kp
    84.40.-x
    72.20.Ht
    Opis:
    Investigations of detection of high power microwaves in planar asymmetrically shaped microwave diodes on the basis of Al$\text{}_{x}$Ga$\text{}_{1-x}$As ternary semiconductors with various AlAs mole fraction are presented. The principle of operation of the microwave diodes is based on carrier heating phenomena in asymmetrically shaped homogeneous semiconductor structure due to different distribution of the electric field strength along the sample. Experimental results of microwave detection on the barrier-less asymmetrically shaped diodes are presented paying special attention to the homogeneity of Al$\text{}_{x}$Ga$\text{}_{1-x}$As which was monitored by photoluminescence technique.
    Źródło:
    Acta Physica Polonica A; 2005, 107, 2; 315-318
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    X-Rays Response of Diamond Detectors Constructed Using Diamond Layers Produced by Low Power Microwave Chemical Vapor Deposition Reactor
    Autorzy:
    Kordyasz, A.
    Bednarek, A.
    Kowalczyk, M.
    Tarasiuk, J.
    Kulczycka, E.
    Teodorczyk, M.
    Gajewski, M.
    Kordyasz, Ł.
    Rowiński, O.
    Lamparski, K.
    Karwański, Ł.
    Lipczewski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402641.pdf
    Data publikacji:
    2015-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.75.-d
    81.15.Gh
    29.40.Vj
    07.85.Fv
    Opis:
    The low power reactor for microwave chemical vapor deposition process is described. The rotating Mo holder of 12 mm diameter and 6 mm height with the diamond substrate was heated by 2.45 GHz microwaves to temperature about 800°C in the range of (1.5-7)% $CH_{4}//H_{2}$ mixture to create plasma at pressure 70 Tr. Stabilization of the holder temperature was performed by optical observation of radiation from the holder followed by adjusting of the magnetron power. Diamond detectors are produced using microwave chemical vapor deposition process grown on single crystal diamond high pressure high temperature Sumimoto substrates, [100] oriented. The response of diamond detectors for X-rays has been measured in the current mode using medical X-rays tube. The linear response of the diamond detector current versus X-ray tube current (dose) is presented.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 5; 1555-1559
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A 100 W ISM 2.45 GHz-band power test system
    Autorzy:
    Wojtasiak, W.
    Gryglewski, D.
    Gwarek, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/307777.pdf
    Data publikacji:
    2005
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    microwave precise heating
    high power solid-state amplifier
    push-pull GaAs FET
    synthetsizer
    power measurement unit
    Opis:
    This paper describes development of solid-state microwave power test system (MPTS) operating over 2.3 to 2.6 GHz with the output power level of 100 W for industrial applications in material processing, and for designing of microwave power industrial equipment. The MPTS unit consists of four major parts: PLL synthesizer, high power solid-state amplifier, detector probes for return losses and leakage measurement and microcontroller. The MPTS system is able to operate in either single fixed-frequency regime, or in swept mode with self-tuning for minimum reflection of a heated load.
    Źródło:
    Journal of Telecommunications and Information Technology; 2005, 2; 23-28
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    FDTD modeling and experimental verification of electromagnetic power dissipated in domestic microwave ovens
    Autorzy:
    Kopyt, P.
    Celuch-Marcysiak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/309259.pdf
    Data publikacji:
    2003
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    symulacja elektromagnetyczna
    algorytm FDTD
    nagrzewanie mikrofalowe
    electromagnetic simulations
    FDTD algorithm
    microwave heating
    Opis:
    The FDTD (Finite Difference Time Domain) method has proven to be effective in modeling high-frequency electromagnetic problems in telecommunications industry. Recently it has been successfully applied in microwave power engineering. In order to accurately model scenarios typical in this field one has to deal with the movement of objects placed inside cavities. This paper describes a simple algorithm that makes it possible to take into account object rotation - important in simulations of domestic microwave ovens. Results of example simulations are presented and an experimental verification of the simulation tool is performed.
    Źródło:
    Journal of Telecommunications and Information Technology; 2003, 1; 59-65
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kuchenki mikrofalowe : kontrola emisji i ekspozycji na pole elektromagnetyczne
    Microwave ovens : to control emissions and exposure to electromagnetic fields
    Autorzy:
    Mariańska, M
    Aniołczyk, H.
    Mamrot, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/180259.pdf
    Data publikacji:
    2017
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    pole elektromagnetyczne
    gęstość mocy
    kuchenki mikrofalowe
    EMF (electromagnetic fields)
    power density
    power density (S)
    microwave ovens
    Opis:
    Kuchenki mikrofalowe należą do obiektów technicznych mogących potencjalnie emitować pole-EM o wartościach mających wpływ na bezpieczeństwo i higienę pracy osób zatrudnionych w gastronomii czy serwisach firmowych. Formalnie, bezpieczeństwo użytkowania kuchenek mikrofalowych powinien gwarantować producent, który zobowiązany jest to przestrzegania standardów emisji promieniowania, po spełnieniu których urządzenia są do puszczone do sprzedaży. Dla użytkowników kuchenek mikrofalowych w gospodarstwach domowych to warunek konieczny. Przedstawione w artykule dane o poziomach tego pola w otoczeniu ponad 170 urządzeń wskazują, że należy przedsięwziąć stosowne działania ochronne. Przedstawiony w opracowaniu istniejący stan prawny dotyczący limitów emisji, który obowiązuje producentów tych kuchenek jest oparty o rekomendacje ICNIRP i spełnia wymagania limitów ekspozycji człowieka na pole - EM. Krajowe przepisy są bardziej rygorystyczne. W pracy dyskutowane są wszystkie te aspekty, szczególnie w odniesieniu do pracowników gastronomii i służb serwisowych, gdzie brak jest faktycznego nadzoru nad warunkami pracy. Zwrócono także uwagę na możliwość zapewnienia bezpieczeństwa użytkownikom kuchenek mikrofalowych w gospodarstwach domowych.
    Microwave owens can potentially emit electromagnetic fields (EMF) at levels affecting the safety and health of people employed in catering and authorized service centres. Theoretically, the manufacturer should guarantee that microwave ovens are safe, devices on the market should comply with emission standards. The levels of EMF in the vicinity of over 170 devices: presented in this article, indicate that appropriate protective measures are necessary. Current regulations on emission limits, which manufacturers of microwave ovens should comply with, are based on ICNIRP recommendations and meet human exposure limits for EMF. The regulations in Poland are more restrictive. This article discusses all those aspects, particularly in relation to staff in catering and in service centres, where there is no effective supervision of the working conditions. The ability to ensure safe household use of microwave ovens is considered, too.
    Źródło:
    Bezpieczeństwo Pracy : nauka i praktyka; 2017, 12; 8-12
    0137-7043
    Pojawia się w:
    Bezpieczeństwo Pracy : nauka i praktyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The 100 W class A power amplifier for L-band T/R module
    Autorzy:
    Wojtasiak, W.
    Gryglewski, D.
    Sędek, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/308787.pdf
    Data publikacji:
    2002
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    modelling
    MESFETs
    finite difference time domain method
    power transistors
    microwave transistors
    Opis:
    In the paper a balanced high power amplifier with class A silicon bipolar transistors for L-band T/R module is described. The amplifier was designed for maximum power and minimum transmitance distortions. The obtained parameters of the amplifier are as follow: output power at 1 dB compression P(1dB)>49 dBm, linear gain IS21I>10 dB, and transmitance deviations during the RF pulse: phase delta arg(S2)<0.9° and deltaP(out)<0.2 dB.
    Źródło:
    Journal of Telecommunications and Information Technology; 2002, 1; 11-13
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modyfikowane radiacyjnie kompozyty polimerowe w ochronie przed promieniowaniem mikrofalowym
    Radiation modified polymer composites in protection from microwave radiation
    Autorzy:
    Głuszewski, W.
    Kubacki, R.
    Rajkiewicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/214300.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    polimerowe kompozyty
    promieniowanie mikrofalowe
    sieciowanie radiacyjne
    impuls elektromagnetyczny
    polymer composites
    microwave radiation
    radiation crosslinking
    high power microwaves
    Opis:
    Niezabezpieczone odpowiednio urządzenia i podzespoły elektroniczne, w których znajdują się układy scalone ulegają bezpowrotnemu zniszczeniu pod wpływem wysokomocowych impulsów elektromagnetycznych - HPM [1]. Urządzenia generujące HPM mogą być zastosowane do działań wojskowych, ale również w celach terrorystycznych [2]. W artykule podsumowano wyniki wstępnych badań w zakresie radiacyjnej modyfikacji kompozytów polimerowych skutecznych w ochronie przed działaniem promieniowań mikrofalowych i radiowych. Prace dotyczyły konkretnego zadania - znalezienia absorbera do pomiarów na otwartych poligonach badawczych. Zbadano pod tym kątem modyfikowany radiacyjnie kompozyt: szkło metaliczne, grafit, elastomer Engage 8200.
    Improperly secured electronic devices and components, which include integrated circuits are irrevocably destroyed by high power electromagnetic pulse - HPM [1]. HPM generating device can be used for military operations, but also for terrorist purposes [2]. The article summarizes the results of preliminary research in the field of radiation modification of polymer composites effective in protecting against microwave and radio radiations. The work was related to a particular task - finding absorber for measurements on open research proving grounds. From this angle radiation modified composites were examined: metallic glass, graphite, elastomer Engage 8200.
    Źródło:
    Postępy Techniki Jądrowej; 2017, 1; 20-23
    0551-6846
    Pojawia się w:
    Postępy Techniki Jądrowej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    TEm,1 coaxial modes generator for cold-testing of high power components and devices
    Autorzy:
    Jaworski, Grzegorz
    Francik, Andrzej
    Nowak, Kacper
    Powiązania:
    https://bibliotekanauki.pl/articles/2173659.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cold testing
    high power components
    microwave path
    mode generator
    test na zimno
    komponent o dużej mocy
    ścieżka mikrofalowa
    generator trybów
    Opis:
    In this paper, we describe the development and design procedure of the new kind of coaxial TEm,1 modes generator based on ring resonator with coupling apertures. The generator enables excitation of subsequent TEm,1 modes in a cylindrical waveguide. The proposed design method allows to obtain high purity TEm,1 modes. The angular mode number can be chosen by replacing the plate with coupling apertures. Structure and parameters of the generator was optimized using CST-Microwave Studio. The mode generator was fabricated and checked on the test bench in an anechoic chamber. The measured field distributions confirm excitation of the desired TEm,1 modes. A good agreement between simulations and measurements is obtained. The presented mode generator, operating in non-rotating TEm,1 modes, is easy to fabricate, and suitable for cold-test experiments of high power components and devices.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 2; art. no. e140467
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    27 dBm Microwave Amplifiers with Adaptive Matching Networks
    Autorzy:
    Rosolowski, D.
    Wojtasiak, W.
    Gryglewski, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/226524.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Adaptive Power Amplifiers (APAs)
    components for Software Defined Radio
    multi-band devices
    multi-mode devices
    RF
    adaptivity
    tunable matching networks
    Opis:
    The paper describes adaptive amplifier design with varactors and pin diodes as regulators of matching networks. As examples the two amplifiers with SHF-0189 HFET transistor and different matching sections were designed and manufactured. The output power level of 27 dBm and gain higher than 13 dB within L and S-band have been achieved. The amplifier design methodology is based on the small-signal approach and DC characteristics of transistors and regulators. Amplifier adaptivity allows us to remotely control the chosen parameters such as: frequency range, output power level, gain and etc.
    Źródło:
    International Journal of Electronics and Telecommunications; 2011, 57, 1; 103-108
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    International Linear Collider Global and Local Implications
    Autorzy:
    Romaniuk, R. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/226596.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ILC
    ILC-GDE
    LCC
    SRF
    accelerators
    particle colliders
    linacs
    superconductivity
    high energy physics experiments
    elementary particles
    hadrons
    electron beams
    positron beams
    microwave resonant cavities
    high power 1,3 GHz systems
    superconducting RF electronics
    Opis:
    ILC machine–International Liner Collider, is one of two accelerators e+e-just under design and advanced consideration to be built with final energy of colliding electron and positron beams over 1 TeV. An alternative project to ILC is CLIC in CERN The ILC machine is an important complementary addition for the research potential of the LHC accelerator complex. The required length of ILC is minimally 30 km, but some versions of the TDR estimates mention nearly 50km. Superconducting RF linacs will be built using well established 1,3 GHz TESLA technology using ultrapure niobium or Nb3Sn resonant microwave cavities of RRR class, of ultimate finesse, working with gradients over 35MV/m, while some versions of the design mention ultimate confinement as high as 50MV/m. Several teams from Poland (Kraków. Warszawa, Wrocław – IFJ-PAN, AGH, UJ, NCBJ, UW, PW, PWr, INT-PAN) participate in the global design effort for this machine – including detectors, cryogenics, and SRF systems. Now it seems that the ILC machine will be built in Japan, during the period of 2016-2026. If true, Japan will turn to a world super-power in accelerator technology no.3 after CERN and USA. The paper summarizes the state-of-the-art of technical and administration activities around the immense ILC and CLIC machines, with emphasis on potential participation of Polish teams in the global effort of newly established LCC –The Linear Collider Consortium.
    Źródło:
    International Journal of Electronics and Telecommunications; 2014, 60, 2; 181-185
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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