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    Research on orthogonal multi-carrier underwater acoustic communication system based on fractional Fourier transform by Yi-lin WANG, Yun CHEN, Jing-wei YIN, Ping CAI, Yi-meng ZHANG

    Published 2012-08-01
    “…Aimed at the traditional OFDM communication system fails when the channel was frequency-selective,rapidly fading and had the Doppler effects,resulting in inter-carrier interference,a orthogonal multi-carrier system for underwater acoustic communication was proposed,which employed orthogonal signal basis of the chirp type corresponding to the fractional Fourier transform (FRFT) signal basis.The scheme used the orthogonal LFM signal as sub-carrier to modulate,which had same chirp rate but different center frequency with overlapped bandwidth,and used fractional Fourier transform for modulation and demodulation method to transmit information.For suppression of the multi-paths channel effect,the guard interval (GI) was used between signal data frame.And the position correction in fractional domain method combining with QDPSK was proposed to suppress the Doppler effects,which simplified the system complexity.The communication scheme had the characteristic of high communication rate,and the maximum rate was up to 3 600bit/s.The effectiveness and reliability of this system was verified through a large number of simulation and lake experiments.…”
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    Emerging Themes in the Ecology and Management of North American Forests by Terry L. Sharik, William Adair, Fred A. Baker, Michael Battaglia, Emily J. Comfort, Anthony W. D'Amato, Craig Delong, R. Justin DeRose, Mark J. Ducey, Mark Harmon, Louise Levy, Jesse A. Logan, Joseph O'Brien, Brian J. Palik, Scott D. Roberts, Paul C. Rogers, Douglas J. Shinneman, Thomas Spies, Sarah L. Taylor, Christopher Woodall, Andrew Youngblood

    Published 2010-01-01
    “…Several “needs” emerged from the discussions regarding approaches to the study of forest ecosystems, including (1) consideration of variable spatial and temporal scales, (2) long-term monitoring, (3) development of universal databases more encompassing of time and space to facilitate meta-analyses, (4) combining field studies and modeling approaches, (5) standardizing methods of measurement and assessment, (6) guarding against oversimplification or overgeneralization from limited site-specific results, (7) greater emphasis on plant-animal interactions, and (8) better alignment of needs and communication of results between researchers and managers.…”
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    Clinical Scoring for Diagnosis of Acute Lower Abdominal Pain in Female of Reproductive Age by Kijja Jearwattanakanok, Sirikan Yamada, Watcharin Suntornlimsiri, Waratsuda Smuthtai, Jayanton Patumanond

    Published 2013-01-01
    “…The developed clinical score is comprised of (1) guarding or rebound tenderness, (2) pregnancy, (3) sites of abdominal tenderness, (4) leukocytosis, (5) peripheral neutrophils ≥75%, and (6) presence of diarrhea. …”
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    Etude de cas : la bipédie des chimpanzés de la communauté de Sebitoli, Ouganda by Lise Pernel, Brigitte Senut, Dominique Gommery, John Paul Okimat, Edward Asalu, Sabrina Krief

    Published 2022-03-01
    “…This method detected few records of charging (3) or carrying food (2). In contrast, most (11) of the orphan chimpanzee's bipedal behaviours involved carrying or handling objects. …”
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    Conservative Treatment of Spontaneous Rectus Sheath Hematomas: Single Center Experience and Literature Review by Banu Karapolat, Halil Afsin Tasdelen, Hatice Ayca Ata Korkmaz

    Published 2019-01-01
    “…Based on the computed tomography findings, the disease was classified as Type 2 found in 9 (64.3%) patients, Type 1 in 3 (21.4%) patients, and Type 3 in 2 (14.2%) patients. …”
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