Wszystkie pola: microwave power - Katalog OPAC zbiorów

Skocz do pozycji: 1.

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

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Skocz do pozycji: 2.

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

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Skocz do pozycji: 3.

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

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Skocz do pozycji: 4.

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

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Skocz do pozycji: 5.

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

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Skocz do pozycji: 6.

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

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Skocz do pozycji: 7.

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

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Skocz do pozycji: 8.

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

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Skocz do pozycji: 9.

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

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Skocz do pozycji: 10.

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

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Skocz do pozycji: 11.

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

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Skocz do pozycji: 12.

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

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Skocz do pozycji: 13.

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

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Skocz do pozycji: 14.

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

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Skocz do pozycji: 15.

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

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