Autor: Xiang, P. - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Optical generation of ultra-wideband signals with a reconfigurable spectral notch-band
Autorzy:: Xiang, P.
Chen, Y.
Chen, D.
Zhao, J.
Tematy:: ultra-wideband (UWB)
ultra-wideband over fiber
notch-band
interference avoidance; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/174353.pdf Link otwiera się w nowym oknie
Opis:: A novel method for optical generation of ultra-wideband signals with a reconfigurable spectral notch-band is proposed. In the proposed system, ultra-wideband signals are generated in the optical domain and an optical tunable delay line is deployed to introduce a notch-band to the spectral profile of the generated ultra-wideband signals, which can effectively avoid the signal interference between ultra-wideband signals and pre-planned narrowband wireless signals used in wireless local area networks (WLAN). A theoretical model describing the proposed system is derived; the optical generation and fiber transmission of ultra-wideband signals with a reconfigurable notch-band are demonstrated via computer simulations.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 2.

Tytuł:: A novel approach to photonic generation of periodic triangular radio frequency waveforms
Autorzy:: Xiang, P.
Guo, H.
Chen, D.
Zhu, H.
Wu, C.
Tematy:: microwave photonics
triangular waveform
polarization modulator (PolM)
microwave photonic filter (MPF)
radio frequency (RF) waveform generation; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/174643.pdf Link otwiera się w nowym oknie
Opis:: A novel approach to photonic generation of triangular radio frequency waveforms with a tunable repetition rate is proposed and analyzed. In the proposed system, a continuous-wave light is modulated by a reference microwave signal through a polarization modulator, and then its output optical sidebands are manipulated by a microwave photonic filter with a negative tap. By properly adjusting the system parameters, full-duty-cycle triangular radio frequency waveforms can be generated after optical-to-electrical conversion, and its repetition rate (frequency) can be tuned in a wide range. A model describing the proposed system is derived, which is verified via computer simulations.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 3.

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.
Tematy:: microwave photonics
microwave photonic filter
chirped microwave signal
dual drive Mach–Zehnder modulator; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/174334.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 4.

Tytuł:: Two new species and four new records of Aquilegia (Ranunculaceae) from China
Autorzy:: Nobis, Marcin
Sukhorukov, Alexander P.
Yu, Sheng-Xiang
Erst, Andrey S.
Xiang, Kunli
Wang, Jian
Shaulo, Dmitry N.
Kushunina, Maria
Wang, Wei
Smirnov, Sergey V.
Opis:: Two new species, Aquilegia xinjiangensis and A. hebeica from northern China, are here described and illustrated. Additionally four species, A. amurensis, A. flabellata, A. kamelinii and A. vicaria are recorded for the country for the first time. The identification key and diagnostic characters of all Aquilegia representatives from China including the newly described and recorded species are provided and discussed.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

Artykuł

na półce

Skocz do pozycji: 5.

Tytuł:: Contribution to the flora of Asian and European countries : new national and regional vascular plant records, 7
Autorzy:: Piwowarczyk, Renata
Pospelov, Igor N.
Paszko, Beata
Koopman, Jacob
Nobis, Agnieszka
Ebel, Aleksandr L.
Király, Angéla
Oklejewicz, Krzysztof
Kushunina, Maria
Sukhorukov, Alexander P.
Vasjukov, Vladimir M.
Nowak, Arkadiusz
Pospelova, Elena B.
Domina, Gianniantonio
Meço, Marjol
Korolyuk, Andrey
Erst, Andrey
Olonova, Marina
Qasimova, Tunzala
Więcław, Helena
Király, Gergely
Seregin, Alexey P.
Molnár, Attila V.
Verkhozina, Alla V.
Wang, Wei
Klichowska, Ewelina
Xiang, Kunli
Zykova, Elena Yu
Wróbel, Anna
Aydın, Zübeyde U.
Óvári, Miklós
Mullaj, Alfred
Nobis, Marcin
Dönmez, Ali A.
Garakhani, Parvana
Wolanin, Mateusz
Bazan, Giuseppe
Liu, Bing
You-Sheng, Chen
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

Artykuł

na półce

Skocz do pozycji: 6.

Tytuł:: Contribution to the flora of Asian and European countries : new national and regional vascular plant records, 6
Autorzy:: Sukhorukov, Alexander P.
Kushunina, Maria
Wolanin, Mateusz
Tupitsyna, Natalia
Pliszko, Artur
Klichowska, Ewelina
Doğru-Koca, Asli
Burri, Jean-François
Werner, Philippe
Wolanin, Magdalena N.
Király, Gergely
Olonova, Marina
Erst, Andrey
Nobis, Agnieszka
Šilc, Urban
Kotukhov, Yuriy
Jogan, Nejc
Vasjukov, Vladimir M.
Shaulo, Dmitry
Nowak, Arkadiusz
Wang, Wei
Verloove, Filip
Piwowarczyk, Renata
Nobis, Marcin
Popovich, Anton V.
Zalewska-Gałosz, Joanna
Ebel, Aleksandr L.
Jędrzejczak, Elżbieta
Caković, Danka
Dönmez, Ali A.
Stešević, Danijela
Zare, Golshan
Xiang, Kun-Li
Opis:: The paper presents new records for 28 vascular plant species from 14 Eurasian countries. Five taxa (Catabrosa capusii, Poa albertii, Poa intricata, Poa pseudoaltaica, Poa sergievskajae) are reported from Kazakhstan, three (Ranunculus pseudomonophyllus, Ranunculus smirnovii, Ranunculus turczaninovii) from Mongolia, three (Panicum barbipulvinatum, Stipa eriocaulis, Tragopogon pratensis subsp. minor) from Poland, three (Euphorbia subtilis, Corydalis grubovii, Thymus callieri) from Russia, two (Atriplex ornata, Corispermum dutreuilii) from Afghanistan, two (Orobanche grenieri, Ranunculus mongolicus) from Kyrgyzstan, two (Erigeron annuus, Sternbergia lutea) from Tajikistan, two (Orobanche baumanniorum, Orobanche kotschyi) from Turkey, one (Polygonum subaphyllum) from China, one (Orobanche bartlingii) from Georgia, one (Rubus slavonicus) from Germany, one (Cenchrus spinifex) from Montenegro, one (Rubus canadensis) from Slovenia and one (Bolboschoenus yagara) from Switzerland. For each species, synonyms, general distribution, habitat preferences, taxonomy with remarks on recognition and differentiation of the species from the most similar taxa occurring in a given country as well as a list of recorded localities (often far from the previously known areas) are presented.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego