Autor: Armstrong, J. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Blind frequency offset estimation for overlap PCC-OFDM systems in presence of phase noise
Autorzy:: Shentu, J.
Armstrong, J.
Powiązania:: https://bibliotekanauki.pl/articles/307668.pdf
Data publikacji:: 2003
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: OFDM
frequency offset
estimation
phase noise
overlap PCC-OFDM
Opis:: This paper presents a technique for frequency offset estimation for polynomial cancellation coded orthogonal frequency division multiplexing with symbols overlapped in the time domain (overlap PCC-OFDM) in the presence of phase noise. The frequency offset estimator is designed based on the subcarrier pair imbalance (SPI) caused by frequency offset. The estimation is performed in the frequency domain at the output of the receiver discrete Fourier transform (DFT). No training symbols or pilot tones are required. Simulations show that this estimator is an approximately linear function of frequency offset. Phase noise does not significantly affect the variance performance of the estimator.
Źródło:: Journal of Telecommunications and Information Technology; 2003, 2; 17-27
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Geochemistry of siliciclastic rocks from the Shemshak Group (Upper Triassic-Middle Jurassic), northeastern Alborz, northern Iran : implications for palaeoweathering, provenance, and tectonic setting
Autorzy:: Taheri, A.
Jafarzadeh, M.
Armstrong-Altrin, J. S.
Mirbagheri, S. R.
Powiązania:: https://bibliotekanauki.pl/articles/2060454.pdf
Data publikacji:: 2018
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: Shemshak Group
geochemistry
provenance
palaeoweathering
tectonic setting
Neotethys
Opis:: Combined petrographic and geochemical data of the siliciclastic sedimentary rocks from the Shemshak Group in the northeastern Alborz Mountains, north of Iran are described, together with their implications for palaeoweathering, their provenance, and tectonic setting. Based on field observations and modal composition, the sandstones are classified as litharenites. The chemical index of alteration (CIA) indicated that the source terrains underwent a moderate intensity of chemical weathering. The index of chemical variation (ICV) values indicated that the Shemshak Group rocks were immature and related to a source area with an active tectonic regime. Major, trace and rare earth element (REE) data suggested the domination of mixed sedimentary (recycled) and igneous rocks in the source area of the Shemshak Group. Petrographic and geochemical characteristics of Shemshak Group rocks suggest an active continental margin (ACM), which corresponds to the collision of the Iran plate with the Turan plate.
Źródło:: Geological Quarterly; 2018, 62, 3; 522--535
1641-7291
Pojawia się w:: Geological Quarterly
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Access-II: a detailed model for crop growth and water conditions
Autorzy:: Armstrong, A.C.
Legros, J.P.
Voltz, M.
Powiązania:: https://bibliotekanauki.pl/articles/25694.pdf
Data publikacji:: 1996
Wydawca:: Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:: soil water
water condition
crop growth
climate condition
England
validation
France
climate change
Źródło:: International Agrophysics; 1996, 10, 3
0236-8722
Pojawia się w:: International Agrophysics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Foam drainage on thick porous substrate
Autorzy:: Armstrong, T.
Smith, H.
Arjmandi-Tash, O.
Cook, J.
Trybala, A.
Starov, V.
Powiązania:: https://bibliotekanauki.pl/articles/110824.pdf
Data publikacji:: 2018
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: foam drainage
imbibition into porous material
Newtonian liquid
Opis:: The use of foam-based applications as a method of drug delivery represents a recent and promising area of research. The interaction of foam and porous substrates have been recently theoretically described using a mathematical model, which combines the equation of foam drainage with that of imbibition of liquid into the porous substrate. Below the drainage of foam placed on chalk experimentally investigated to verify the theory prediction. The surfactants sodium dodecyl sulfate (SDS) and Triton X-100 were used to form a foam. The initial liquid volume fractions of the foam were found to be ranging in between 14.12 and 16.46%. The porosity and permeability of the chalk substrate were experimentally obtained at 59.1% and 3.122·10-11 m2 respectively. The height of foam deposited onto the thick porous substrate (chalk) was 2.5 cm and 6 cm. The imbibition into the chalk, the height of foam, and the bubble size within the foam were monitored. The latter enabled the kinetics of the drainage/imbibition to be determined and compared with the predictions according to the theoretical model. The rate of decrease in foam height was initially high and decreased over time as predicted by the theoretical model. All the foam displayed an initial rapid imbibition through the porous substrate, which is again in the agreement with the theory predictions. It was found that solutions with lower surfactant concentrations could penetrate deeper into the chalk. The imbibition front was observed to be uniform: evenly distributed liquid throughout the cross-section of the porous substrate.
Źródło:: Physicochemical Problems of Mineral Processing; 2018, 54, 1; 193-202
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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