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Wyszukujesz frazę "Microwave" wg kryterium: Temat


Tytuł:
Influence of blood flow on temperature distribution of human tissue during interstitial microwave hyperthermia
Autorzy:
Gas, P.
Powiązania:
https://bibliotekanauki.pl/articles/377405.pdf
Data publikacji:
2012
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
interstitial microwave hyperthermia
microwave
human tissue
Opis:
This paper describes through computer simulation the utilization of the interstitial microwave hyperthermia in the treatment of pathological tissues. Electromagnetic field, radiated from coaxial-slot antenna is used to produce a temperature gradient in human tissue. Therefore the presented issue is a coupling of the electromagnetic field and the temperature field. For simplification a 2D model is considered. In order to conduct a full investigation of the temperature variation in the computational domain, Pennes equation, which takes into account blood perfusion rate, heat conduction effects of the tissue, heat generation due to metabolic processes and external heat sources, is solved. The microwave antenna is designed to operate at 2.45 GHz. Influence of the blood perfusion rate on temperature distribution in human tissue is investigated and at the end simulation results are presented.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2012, 72; 41-48
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prospects for the use of microwave energy in grain crop seeding
Autorzy:
Kipriyanov, Fedor A.
Savinykh, Petr A.
Isupov, Alexey Yu.
Plotnikova, Yulia A.
Medvedeva, Natalia A.
Belozerova, Svetlana V.
Powiązania:
https://bibliotekanauki.pl/articles/1844334.pdf
Data publikacji:
2021
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
disinfection
microwave drying
microwave energy
microwave use on plants
pre-sowing treatment
Opis:
This study looks at determining the main trends in the application of microwaves on plants in agricultural production in the processing of grain material, it provides examples of their effectiveness and an overview of the use of microwaves on plants available on the Russian market. Additionally, the research studied the experience and developments of leading scientists in the field of microwave radiation. Analysis of the available sources provided information on the positive effect of microwave radiation in the processing of crops. The use of microwaves on plants during drying destroys pathogens and bacteria, in particular, microwave processing of red lentils reduces grey mould damage by up to 30%. Positive results are also noted in the microwave processing of other crops, providing an increase in germination capacity of up to 7% and yield growth of up to 6%. The microwave plant market in Russia is represented mainly by dryers, and the use of microwaves on plants combining several functions of drying, disinfection, and pre-sowing stimulation.
Źródło:
Journal of Water and Land Development; 2021, 49; 74-78
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Generation of chirped microwave signal with any central frequency based on a nonuniformly spaced finite impulse response filter
Autorzy:
Chen, D.
Wang, R.
Pu, T.
Xiang, P.
Fang, T.
Zheng, J.
Xiong, J.
Powiązania:
https://bibliotekanauki.pl/articles/174334.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
microwave photonics
microwave photonic filter
chirped microwave signal
dual drive Mach–Zehnder modulator
Opis:
A novel optical approach to generating a chirped microwave signal by using a nonuniformly spaced finite impulse response filter is proposed and demonstrated. In this scheme, a narrowband Gaussian pulse is used as the original chirped-free signal, which is easy to be acquired. To eliminate the need of a wideband chirped-free signal, a mixer and a radio frequency signal are used to up-convert the spectrum of the original Gaussian signal. Therefore, the required frequency response can be calculated and reconstructed by a finite impulse response filter with nonuniformly spaced taps. Besides, a dual drive Mach–Zehnder modulator is used to realize single sideband modulation of the chirpedfree signal. Thus, the transfer function induced by the fiber dispersion is eliminated and the chirped microwave signal with any central frequency can be generated. In this paper, a design example of a filter with a central frequency of 10GHz is provided, and generation of the target chirped microwave signal is also demonstrated by numerical simulations.
Źródło:
Optica Applicata; 2016, 46, 3; 399-408
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of a selectable multi-passband microwave photonic filter based on cascaded optical comb filters
Autorzy:
Wang, F.
Peng, M. M.
Powiązania:
https://bibliotekanauki.pl/articles/2033940.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
microwave photonic filter
multi-passband filter
microwave signal processing
Opis:
A multi-passband microwave photonic filter (MPF) with selectable passband frequency, spanning 0-20 GHz frequency range, is proposed, and experimentally demonstrated, in which passband frequency can be flexibly selected within a maximum passband number to four. The scheme is based on the generation of tunable optical comb lines using a broadband optical source sliced by cascaded optical comb filters, achieved by connecting an in-line birefringence fiber filter and a reconfigurable Lyot filter in series, such that various filter tap spacing and spectral combinations are obtained for the configuration of the MPF. The proposed MPF can operate with four different passband states, namely, single-, dual-, triple-, and quadruple-passband, only by adjusting polarization states of the cascaded optical comb filters. All these passbands are with a 3-dB bandwidth varying from 200 to 460 MHz and more than 20-dB sidelobe suppression.
Źródło:
Optica Applicata; 2021, 51, 3; 457-467
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reconfigurable and tunable multi-tap bandpass microwave photonic filter based on a hybrid-gain-assisted multi-wavelength fiber ring laser
Autorzy:
Peng, Mengmeng
Wang, Fei
Shi, Lun
Huang, Jingxin
Kang, Wen
Powiązania:
https://bibliotekanauki.pl/articles/174908.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
microwave photonic filter
multi-wavelength fiber ring laser
microwave signal processing
Opis:
A reconfigurable and tunable multi-tap bandpass microwave photonic filter based on a hybrid-gain-assisted multi-wavelength fiber ring laser (HMFRL) is proposed and experimentally demonstrated. The HMFRL containing a hybrid gain medium and a high birefringence fiber loop mirror serves as the multiple taps generator for the microwave photonic filter. In order to realize a bandpass filter, the multiple taps are phase modulated, then the modulated signal is launched into a coil of dispersion compensating fiber to introduce different time delays for each tap. As a result, a bandpass response is obtained at the output of a high speeding photodetector. By adjusting the bias of the semiconductor optical amplifier from 344 to 450 mA, the number of multiple taps can be increased without optical signal-to-noise ratio degradation. Thus, a multi-tap bandpass microwave photonic filter with bandwidth reconfiguring from 449 to 274 MHz is achieved. In addition, by changing the length of polarization maintaining fiber in the high birefringence fiber loop mirror, the wavelength spacing of the multiple taps can be adjusted, making the bandpass microwave photonic filter’s free spectral range tunable.
Źródło:
Optica Applicata; 2019, 49, 3; 499-507
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis of nanohydroxyapatite using microwave energy
Autorzy:
Chodara, A.
Kuśnieruk, S.
Chudoba, T.
Wojnarowicz, J.
Dąbrowska, S.
Łojkowski, W.
Powiązania:
https://bibliotekanauki.pl/articles/285151.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
hydroxyapatite
microwave energy
components
Źródło:
Engineering of Biomaterials; 2016, 19, 138; 116
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Decomposition of tars in microwave plasma – preliminary results
Autorzy:
Wnukowski, M
Powiązania:
https://bibliotekanauki.pl/articles/125310.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
tar
gasification
microwave plasma
Opis:
The paper refers to the main problem connected with biomass gasification - a presence of tar in a product gas. This paper presents preliminary results of tar decomposition in a microwave plasma reactor. It gives a basic insight into the construction and work of the plasma reactor. During the experiment, researches were carried out on toluene as a tar surrogate. As a carrier gas for toluene and as a plasma agent, nitrogen was used. Flow rates of the gases and the microwave generator’s power were constant during the whole experiment. Results of the experiment showed that the decomposition process of toluene was effective because the decomposition efficiency attained above 95%. The main products of tar decomposition were light hydrocarbons and soot. The article also gives plans for further research in a matter of tar removal from the product gas.
Źródło:
Journal of Ecological Engineering; 2014, 15, 3; 23-28
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Urządzenie namierzania oraz pomiaru częstotliwości sygnałów radiolokacyjnych i telekomunikacyjnych
Device of direction finding and frequency measurement of radar and telecommunication signals
Autorzy:
Rutkowski, A. K.
Powiązania:
https://bibliotekanauki.pl/articles/210638.pdf
Data publikacji:
2006
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
microwave frequency discriminator
microwave phase discriminator
angle of arrival
direction of emitter
Opis:
Odebranie sygnałów mikrofalowych oraz wyznaczenie ich parametrów jest źródłem informacji o emitującym je urządzeniu nadawczym. Do podstawowych charakterystyk wykrytych sygnałów mikrofalowych zalicza się: częstotliwość nośną oraz kąt nadejścia. W Zakładzie Mikrofal Instytutu Radioelektroniki WEL WAT opracowano model urządzenia umożliwiającego wykrycie oraz określenie kierunku na nadajniki radiolokacyjne i telekomunikacyjne. Urządzenie to pozwala również na pomiar parametrów sygnałów emitowanych przez te nadajniki. Pomiar kąta nadejścia sygnałów jest realizowany metodą fazową. Chwilowa wartość częstotliwości określana jest przy użyciu mikrofalowego dyskryminatora częstotliwości. System antenowy składa się z czterech dwugrzbietowych anten szerokopasmowych. Umożliwia to pomiar kąta nadejścia sygnałów zarówno w płaszczyźnie elewacji, jak i w azymucie. Urządzenie może służyć do rozpoznawania sygnałów prostych oraz złożonych. Średni błąd pomiaru częstotliwości był mniejszy niż ± 0,2 MHz, a jego wartość maksymalna nie przekraczała ± 0,5 MHz w całym zakresie mierzonych częstotliwości. Kierunek nadejścia sygnału określany był z dokładnością ± 0,2° w całym paśmie pracy.
The paper concerns a device designed for reconnaissance of the electromagnetic space. The presented device determines an angle of arrival (AOA) and immediately evaluates frequency of a received microwave signal. The angular segment of the instantaneous surveillance is 44 degrees in width. The device works within the frequency band from 0.75 to 1.25 GHz. It contains four-element antenna array, direction finding DF channel and instantaneous frequency measurement IFM channel. This structure performs so-called single-pulse phase method of direction of signal arrival and frequency estimation. The microwave parts of both these channels were printed onto a single substrate. This appliance is controlled by the computer which stores calibration data and takes them into consideration in the process of evaluation of the frequency and the direction of incoming microwave signals. This set has been successfully used for recognition of various signals emitted by close and remote electromagnetic sources. The achieved average error of the frequency estimation was ± 0.2 MHz, and maximum frequency error did not exceed ± 0.5 MHz. The accuracy of the angle of arrival determination was better than 0.2 degrees. The presented model of the device has been developed for observation of some segment of the space. To obtain all around instantaneous scanning it is necessary to appropriately place several such devices. The device can intercept simple microwave signals and the signals with LFM, FSK, and PSK modulation as well. The device architecture and experimental results are presented.
Źródło:
Biuletyn Wojskowej Akademii Technicznej; 2006, 55, 1; 203-212
1234-5865
Pojawia się w:
Biuletyn Wojskowej Akademii Technicznej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza numeryczna mikrofalowego modułu plazmowego do produkcji wodoru
Numerical analysis of microwave plasma module for hydrogen production
Autorzy:
Sobański, M.
Jasiński, M.
Mizeraczyk, J.
Powiązania:
https://bibliotekanauki.pl/articles/159714.pdf
Data publikacji:
2013
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
Tematy:
mikrofalowy moduł plazmowy
mikrofalowy generator plazmy
wyładowanie mikrofalowe
produkcja wodoru
microwave plasma module
microwave plasma source
microwave discharges
hydrogen production
Opis:
Mikrofalowy moduł plazmowy (MMP) służy do produkcji wodoru poprzez reforming węglowodorów. W pracy przedstawiono wyniki optymalizacji transferu energii w MMP o strukturze współosiowej zasilanym falowodem WR 340. W omawianym MMP wyładowanie mikrofalowe powstaje pod ciśnieniem atmosferycznym, a częstotliwość pracy wynosi 2,45 GHz. Wyniki analizy numerycznej pokazują, że dla wybranej konfiguracji MMP minimalny stosunek mocy fali odbitej do mocy fali padającej osiąga wartości po-niżej 5% w szerokim zakresie zmian położenia elementu strojącego.
Microwave plasma module (MPM) is used for hydrogen production via conversion of hydrocarbons. We present optimization of energy transfer in the waveguide-supplied coaxial-line-based MPM. The MPM operates at atmospheric pressure and frequency of 2.45 GHz. The MPM is terminated with movable plunger which plays the role of the tuning element. Tuning characteristics are defined as the dependence of the PR / PI as a function of the position ls of the movable plunger, where PR and PI are power reflected and power incident, respectively. The powers PR and PI are measured in input plane of the MPM. Optimization has been performed using Comsol Multiphysics software. The main construction elements which have been optimized are the length of the shorted coaxial line section, the diameter of the inner conductor of coaxial line and finally the height of the reduced height waveguide section.
Źródło:
Prace Instytutu Elektrotechniki; 2013, 261; 105-114
0032-6216
Pojawia się w:
Prace Instytutu Elektrotechniki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical-microwave transmission system with subcarrier multiplexing for industrial measurement systems
Autorzy:
Dawidczyk, J.
Galwas, B.A.
Skulski, J.
Szczepaniak, Z.
Gruchała, H.
Malyshev, S.
Powiązania:
https://bibliotekanauki.pl/articles/308142.pdf
Data publikacji:
2002
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
optical-microwave link
subcarrier multiplexing
Opis:
We describe short-distance three-channel optical-microwave link with subcarrier multiplexing for transmission digital and/or analog data between different points of industrial measurement systems. The optical fiber link operates with Fabry-Perot laser at 1300 nm, multimode, fiber and PIN photodiode receiver. From microwave point of view three carriers with frequencies 600 MHz, 800 MHz and 1000 MHz were chosen. The structure and main parameters of a link are reported and discussed.
Źródło:
Journal of Telecommunications and Information Technology; 2002, 1; 18-21
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
MOVPE InP based material for millimeter and submillimeter wave generation and amplification
Autorzy:
Strupiński, W.
Kosiel, K.
Jasik, A.
Jakieła, R.
Jeleński, A.
Kollberg, E.
Dillner, L.
Nawaz, M.
Powiązania:
https://bibliotekanauki.pl/articles/308777.pdf
Data publikacji:
2002
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
epitaxy InP
MOVPE
microwave generation
Opis:
The potential of the MOVPE growth process for millimeter and submillimeter wave generation and amplification is presented. The increase in layer quality, the improved homogeneity and purity, the precision of mono-layers growth and wide spectrum III-V compounds makes MOVPE techniques very attractive for modern device applications. The characterisation results of the heterostructures dedicated for HBV varactors and 2-DEG transistors (HEMT) are described.
Źródło:
Journal of Telecommunications and Information Technology; 2002, 1; 8-10
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photo-devices for optical controlling of microwave circuits
Autorzy:
Szczepaniak, Z.R.
Galwas, B.A.
Powiązania:
https://bibliotekanauki.pl/articles/309090.pdf
Data publikacji:
2001
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
microwave optoelectronic switch
photodiode
phototransistor
Opis:
The most important optical devices which can be used for controlling microwave circuits will be presented in the paper. The performance and the parameters of the devices such as semiconductor microwave optoelectronic switches, photodiodes and phototransistors were described. The influence of the optical illumination on their microwave parameters will be described in details, including the our own investigations and simulations results. Several applications of such devices and their potential possibilities will be presented.
Źródło:
Journal of Telecommunications and Information Technology; 2001, 3; 86-94
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Direct extraction techniques of microwave small-signal model and technological parameters for sub-quarter micron SOI MOSFETs
Autorzy:
Goffioul, M.
Vanhoenacker, D.
Raskin, J.P.
Powiązania:
https://bibliotekanauki.pl/articles/309316.pdf
Data publikacji:
2000
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
microelectronics
microwave devices
SOI MOSFET
Opis:
Original extraction techniques of microwave small-signal model and technological parameters for SOI MOSFETs are presented. The characterization method combines careful design of probing and calibration structures, rigorous in situ calibration and a powerful direct extraction method. The proposed characterization procedure is directly based on the physical meaning of each small-signal behavior of each model parameter versus bias conditions, the high frequency equivalent circuit can be simplified for extraction purposes. Biasing MOSFETs under depletion, strong inversion and saturation conditions, certain technological parameters and microwave small-signal elements can be extracted directly from the measured S-parameters. These new extraction techniques allow us to understand deeply the behavior of the sub-quarter micron SOI MOSFETs in microwave domain and to control their fabrication process.
Źródło:
Journal of Telecommunications and Information Technology; 2000, 3-4; 59-66
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of microwave performances for sub-quarter micron fully- and partially-depleted SOI MOSFETs
Autorzy:
Goffioul, M.
Dambrine, G.
Vanhoenacker, D.
Raskin, J.P.
Powiązania:
https://bibliotekanauki.pl/articles/309323.pdf
Data publikacji:
2000
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
microelectronics
microwave devices
SOI MOSFET
Opis:
The high frequency performances including microwave noise parameters for sub-quarter micron fully- (FD and partially-depleted (PD) silicon-on-insulator (SOI) n-MOSFETs are described and compared. Direct extraction techniques based on the physical meaning of each small-signal and noise model element are used to extract the microwave characteristics of various FD and PD SOI n-MOSFETs with different channel lenghts and widths. TiSi2 silicidation process has been demonstrated very efficient to reduce the sheet and contact resistances of gate, source and drain transistor regions. 0.25 žm FD SOI n-MOSFETs with a total gate width of 100 žm present a state-of-the-art minimum noise figure of 0.8 dB and high associated gain of 13 dB at 6 GHz for V(ds) = 0.75 V and P(dc) < 3 mW. A maximum extrapolated oscillation frequency of about 70 GHz has been obtained at V(ds) = 1 V and J(ds) = 100 mA/mm. This new generation of MOSFETs presents very good analogical and digital high speed performances with a low power consumption which make them extremely attractive for high frequency portable applications such as the wireless communications.
Źródło:
Journal of Telecommunications and Information Technology; 2000, 3-4; 72-80
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A convenient method for synthesis of 11-[14C]-loxapine
Autorzy:
Saemian, N.
Shirvani, G.
Matloubi, H.
Powiązania:
https://bibliotekanauki.pl/articles/148682.pdf
Data publikacji:
2005
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
dibenzoxazepine
carbon-14
microwave heating
Opis:
8-Chloro-11-(4-methyl-1-piperazinyl)-dibenz[b,f][1,4]oxazepine labeled with carbon-14 in 11-position has been synthesized as part of a 5-step sequence from potassium [14C] cyanide.
Źródło:
Nukleonika; 2005, 50, 4; 139-141
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł

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