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Year Number of Results
1918 1
1930 1
1957 1
1960 1
1966 1
1967 1
1968 1
1969 3
1970 1
1971 1
1972 1
1973 1
1974 1
1975 3
1978 3
1979 7
1980 7
1981 4
1982 7
1983 6
1984 5
1985 9
1986 11
1987 14
1988 15
1989 16
1990 24
1991 19
1992 23
1993 29
1994 46
1995 36
1996 30
1997 48
1998 51
1999 58
2000 56
2001 65
2002 73
2003 91
2004 110
2005 143
2006 174
2007 202
2008 163
2009 191
2010 230
2011 205
2012 258
2013 261
2014 230
2015 260
2016 288
2017 264
2018 284
2019 297
2020 319
2021 308
2022 355
2023 372
2024 133

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5,623 results

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Page 1
Weddell seals produce ultrasonic vocalizations.
Cziko PA, Munger LM, Santos NR, Terhune JM. Cziko PA, et al. J Acoust Soc Am. 2020 Dec;148(6):3784. doi: 10.1121/10.0002867. J Acoust Soc Am. 2020. PMID: 33379885
Eleven vocal elements had ultrasonic center frequencies (20 kHz), including chirps, whistles, and trills, with two elements at >30 kHz. Six elements had fundamental frequencies always >21 kHz. The fundamental frequency of one repetitive U-shaped whistle element reach …
Eleven vocal elements had ultrasonic center frequencies (20 kHz), including chirps, whistles, and trills, with two elements at >30 …
Evolution and hormonal regulation of sex differences in the electrocommunication behavior of ghost knifefishes (Apteronotidae).
Smith GT. Smith GT. J Exp Biol. 2013 Jul 1;216(Pt 13):2421-33. doi: 10.1242/jeb.082933. J Exp Biol. 2013. PMID: 23761467 Review.
During social interactions, apteronotids also modulate their EODs to produce motivational signals known as chirps. Chirp structure differs markedly across species, and many species produce two or more discrete chirp types with potentially different functions. …
During social interactions, apteronotids also modulate their EODs to produce motivational signals known as chirps. Chirp struc …
Influence of long-term social interaction on chirping behavior, steroid levels and neurogenesis in weakly electric fish.
Dunlap KD, Chung M, Castellano JF. Dunlap KD, et al. J Exp Biol. 2013 Jul 1;216(Pt 13):2434-41. doi: 10.1242/jeb.082875. J Exp Biol. 2013. PMID: 23761468 Free PMC article. Review.
Compared with isolated fish, fish living in pairs have greater production of chirps, an electrocommunication signal, during dyadic interactions and in response to standardized artificial social stimuli. Social interaction also promotes neurogenesis in the periventricular z …
Compared with isolated fish, fish living in pairs have greater production of chirps, an electrocommunication signal, during dyadic in …
Chirp evoked otoacoustic emissions.
Neumann J, Uppenkamp S, Kollmeier B. Neumann J, et al. Hear Res. 1994 Sep;79(1-2):17-25. doi: 10.1016/0378-5955(94)90123-6. Hear Res. 1994. PMID: 7806479 Clinical Trial.
In contrast to click stimuli, chirp signals have the advantage of stimulating a freely selectable frequency range. In addition, chirp signals contain more energy than a click stimulus with the same maximum amplitude. ...
In contrast to click stimuli, chirp signals have the advantage of stimulating a freely selectable frequency range. In addition, ch …
Fast-frame single-shot pump-probe spectroscopy with chirped-fiber Bragg gratings.
Kobayashi M, Arashida Y, Yamashita G, Matsubara E, Ashida M, Johnson JA, Katayama I. Kobayashi M, et al. Opt Lett. 2019 Jan 1;44(1):163-166. doi: 10.1364/OL.44.000163. Opt Lett. 2019. PMID: 30645575
To acquire single-shot pump-probe waveforms for each laser pulse at a high repetition rate and high signal-to-noise ratio, we combined the photonic time-stretch technique and time-encoding method using a chirped-fiber Bragg grating (CFBG) and a grating-pair pulse compresso …
To acquire single-shot pump-probe waveforms for each laser pulse at a high repetition rate and high signal-to-noise ratio, we combined the p …
Optical parametric chirped pulse oscillation.
Brinkmann M, Hellwig T, Fallnich C. Brinkmann M, et al. Opt Express. 2017 May 29;25(11):12884-12895. doi: 10.1364/OE.25.012884. Opt Express. 2017. PMID: 28786640 Free article.
A concept to flexibly adjust the spectral bandwidth of the output pulses of a fiber optical parametric oscillator is presented. By adjusting the chirp of the pump pulses appropriate to the chirp of the resonant pulses, the energy of the output pulses can be transfer …
A concept to flexibly adjust the spectral bandwidth of the output pulses of a fiber optical parametric oscillator is presented. By adjusting …
Histotripsy Bubble Cloud Contrast With Chirp-Coded Excitation in Preclinical Models.
Wallach EL, Shekhar H, Flores-Guzman F, Hernandez SL, Bader KB. Wallach EL, et al. IEEE Trans Ultrason Ferroelectr Freq Control. 2022 Feb;69(2):787-794. doi: 10.1109/TUFFC.2021.3125922. Epub 2022 Jan 27. IEEE Trans Ultrason Ferroelectr Freq Control. 2022. PMID: 34748487
The contrast-to-tissue ratio (CTR) was improved in scattering media for subharmonic contrast relative to fundamental contrast (both chirped and standard imaging pulses) with the longest-duration chirped-pulse tested (7.4 [Formula: see text] pulse duration). ...Overa …
The contrast-to-tissue ratio (CTR) was improved in scattering media for subharmonic contrast relative to fundamental contrast (both chirp …
Detrimental effects of period-chirped gratings in pulse compressors.
Bienert F, Röcker C, Dietrich T, Graf T, Ahmed MA. Bienert F, et al. Opt Express. 2023 Nov 20;31(24):40687-40704. doi: 10.1364/OE.505875. Opt Express. 2023. PMID: 38041362 Free article.
It is shown that the chirp creates a characteristic spatio-spectral error pattern, which leads to a degradation of the beam quality and an increase of the pulse duration. The experimental investigations, for which both a narrow-bandwidth continuous-wave and a pulsed laser …
It is shown that the chirp creates a characteristic spatio-spectral error pattern, which leads to a degradation of the beam quality a …
Nonlinear spectral blueshift in semiconductor optical amplifiers.
Bednyakova AE, Khudozhitkova D, Kokhanovskiy A, Turitsyn SK. Bednyakova AE, et al. Opt Lett. 2021 Oct 1;46(19):4757-4760. doi: 10.1364/OL.438870. Opt Lett. 2021. PMID: 34598192
We demonstrate that spectral peak power of negatively chirped optical pulses can acquire a blueshift after amplification by a semiconductor optical amplifier. The central wavelength of a transform limited optical pulse translates over 20 nm towards a shorter wavelength aft …
We demonstrate that spectral peak power of negatively chirped optical pulses can acquire a blueshift after amplification by a semicon …
Photonic generation of multi-format chirped signals with a high switching rate.
Guo Y, Wang M, Li Y, Wang J, Chen D. Guo Y, et al. Opt Lett. 2023 Aug 15;48(16):4272-4275. doi: 10.1364/OL.497822. Opt Lett. 2023. PMID: 37582010
An up-chirp signal and a binary code signal are used to drive one of the sub-dual-drive Mach-Zehnder modulators (sub-DDMZMs) integrated in the DP-BPSK modulator. Another integrated sub-DDMZM is driven by a down-chirp signal and another binary code signal. By careful …
An up-chirp signal and a binary code signal are used to drive one of the sub-dual-drive Mach-Zehnder modulators (sub-DDMZMs) integrat …
5,623 results