نتایج جستجو برای: pulses

تعداد نتایج: 35993  

2007
P. Weltevrede B. W. Stappers J. M. Rankin G. A. E. Wright

We present a detailed study of the single radio pulses of PSR B0656+14. The emission can be characterized by two separate populations of pulses: bright pulses have a narrow " spiky " appearance in contrast to the underlying weaker broad pulses. The shape of the pulse profile requires an unusually long timescale to achieve stability (over 25,000 pulses at 327 MHz) caused by spiky emission. The e...

1998
N. Nishimura C. B. Schaffer E. H. Li

We used water and human skin tissue to compare the surgical potential of 100-fs and 200-ps laser pulses. For investigation of threshold behavior of 100-fs and 200-ps pulses, we use water as a model for tissue. In addition to having a lower threshold, we find that energy deposition is much more consistent with 100-fs pulses. We also compared 100-fs and 200-ps laser pulse effects on the surface a...

2016
H. I. Saleh A. A. Arafa

The crystal identification and particle identification require applying pulse shape discrimination (PSD) or Crystal Identification (CI) me thods to differentiate between two or more types of scintillation pulses according to their decay times. The characterizations of scintillation pulses significantly affect the performance and the complexity of the CI algorithm. This paper implements a mathem...

2007
Kevin R. Smith Vitaliy I. Vasyuchka Mingzhong Wu Gennadiy A. Melkov Carl E. Patton

Magnetostatic backward volume spin-wave SW pulses have been cloned and trapped through the use of multiple, properly timed, parametric pumping PP pulses. The experiment was done with 30-ns-wide pulses at 5 GHz in a 7.1m-thick yttrium iron garnet film. Well-timed, large-area, high-power, 2-ns-wide microwave pulses at 10 GHz were used to pump the SW pulses. The interaction between the initial SW ...

2011
K. Narahara

We investigate numerically the collision of nonlinear envelope pulses in composite rightand left-handed transmission lines with regularly spaced Schottky varactors. Because of the nonlinearity caused by the Schottky varactors, the dispersive distortion of envelope pulses is well compensated. We find that when two nonlinear envelope pulses traveling in the opposite directions collide, two envelo...

Journal: :Journal of the Optical Society of America. A, Optics, image science, and vision 2004
Michel Zamboni-Rached Hugo E Hernández-Figueroa Erasmo Recami

We analyze the properties of chirped optical X-shaped pulses propagating in material media without boundaries. We show that such ("superluminal") pulses may recover their transverse and longitudinal shapes after some propagation distance, whereas the ordinary chirped Gaussian pulses can recover their longitudinal width only (since Gaussian pulses suffer a progressive transverse spreading during...

Journal: :Physical review letters 2001
D Golomb G B Ermentrout

We study the propagation of traveling solitary pulses in one-dimensional networks of excitatory and inhibitory integrate-and-fire neurons. Slow pulses, during which inhibitory cells fire well before neighboring excitatory cells, can propagate along the network at intermediate inhibition levels. At higher levels, they destabilize via a Hopf bifurcation. There is a bistable parameter regime in wh...

Journal: :Optics express 2012
Armand Vedadi Mohammad Amin Shoaie Camille-Sophie Brès

A novel method using optical fiber parametric amplification and phase modulation is proposed in order to generate Nyquist pulses. Using parabolic pulses as a pump, we show theoretically that it is possible to generate Nyquist pulses. Furthermore, we show that by using a sinusoidal pump (pump intensity modulated by an RF tone), it is possible to obtain pulses with characteristics that are close ...

2001
Kazuya Takasago Akira Endo Akira Yada Masakazu Washio Taisuke Miura Fumihiko Kannari

Amplified square shaped picosecond pulses was generated for low emittance electron beam generation in a photocathode RF-GUN. Square shaped pulses were generated by using Ti:sapphire amplifier system in inrfared region and then converted to ultraviolet region via third harmonics generation. Generated squares shaped pulses were measeured by crosscorrelation and spectral interferometric technique ...

Journal: :Journal of controlled release : official journal of the Controlled Release Society 1999
R Vanbever U F Pliquett V Préat J C Weaver

High-voltage pulses have been shown to increase rates of transport across skin by several orders of magnitude on a time scale of minutes to seconds. Two main pulse protocols have been employed to promote transport: the intermittent application of short ( approximately 1 ms) high-voltage (approximately 100 V across skin) pulses and a few applications of long (=100 ms) medium-voltage (>30 V acros...

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