lunes, 17 de junio de 2013


echo: mid-14c., from Latin echo, from Greek echo, personified as a mountain nymph, from or related toekhe "sound," ekhein "to resound," from PIE root *swagh- "to resound" (cf. Sanskrit vagnuh"sound," Latin vagire "to cry," Old English swogan "to resound"). Related: Echoes.

эхо russian
eggo afrikaans
jehonë albanian
صدى arab
ընդօրինակել armenian
əks-səda azeri
рэха bieloruso
jeka bosnio
ехо bulgaro
ಪ್ರತಿಧ್ವನಿ canares
ressò catalan
ipalanog cebuano

Observation of a photon echo

NA Kurnit, ID Abella, SR Hartmann - Physical Review Letters, 1964 - APS
fore the phototube to reduce the amount of scat-tered light from the excitation pulses. It is acti-vated by a 100-nsec pulse to permit observation of the echo. Not shown in Fig. 2 are a pair of coils, which can provide a magnetic field of 250 gauss along the direction of the incident ...

Ancient history in the New World: integrating oral traditions and the archaeological record in deep time

RC Echo-Hawk - American Antiquity, 2000 - JSTOR
Oral traditions provide a viable source of information about historical settings dating back far
in time-a fact that has gained increasing recognition in North America, although
archaeologists and other scholars typically give minimal attention to this data. The Native ...

Impact-echo. Nondestructive evaluation of concrete and masonry

MJ Sansalone, WB Streett - 1997 -
Abstract: This book draws together all of the available knowledge and information about
impact-echo and presents it in a concise and logical format. Descriptions of the applications
of impact-echo are accompanied by case studies, which include photographs, drawings, ...

Quadrupolar echo deuteron magnetic resonance spectroscopy in ordered hydrocarbon chains

JH Davis, KR Jeffrey, M Bloom, MI Valic… - Chemical Physics …, 1976 - Elsevier
Abstract The quadrupolar spin echo from deuterons in ordered hydrocarbon systems is
shown to provide a much more reliable spectrum than the conventional free induction decay
Fourier transform. Spectrometer dead time is eliminated, phase correction uncertainties ...

[CITAS] Echo-planar MR imaging.

RR Edelman, P Wielopolski, F Schmitt - Radiology, 1994 -
(MR) imaging, proposed by Mansfield in i977 (i), is a fast imaging technique that allows one
to collect all the data required to reconstruct an image in a brief interval, as short as the
duration of a single readout period (about 30-iOO msec)(2). With image acquisition times ...

[PDF] A self-adaptive echo canceller

MM Sondhi, AJ Presti - Bell Syst. Tech. J, 1966 -
Conventional echo suppressors combat echoes generated at hybrid junctions in lo11g
distance telephone connections by interrupting the return path accordiI1g to some decision
scheme based upon the relative levels of the outgoing and return signals. In this brief, a ...

Three‐dimensional magnetization‐prepared rapid gradient‐echo imaging (3D MP RAGE)

JP Mugler, JR Brookeman - Magnetic Resonance in Medicine, 1990 - Wiley Online Library
Abstract A new three-dimensional imaging technique which is applicable for 3D MR imaging
throughout the body is introduced. In our preliminary investigations we have acquired high-
quality 3D image sets of the abdomen showing minimal respiratory artifacts in just over 7 ...

[CITAS] Encyclopedia of Native American Religions

AB Hirschfelder, PF Molin, WR Echo-Hawk - 1992 -
An academic directory and search engine.

Correction for geometric distortion in echo planar images from B0 field variations

P Jezzard, RS Balaban - Magnetic resonance in medicine, 1995 - Wiley Online Library
Abstract A method is described for the correction of geometric distortions occurring in echo 
planar images. The geometric distortions are caused in large part by static magnetic field
inho-mogeneities, leading to pixel shifts, particularly in the phase encode direction. By ...

Reduction of eddy‐current‐induced distortion in diffusion MRI using a twice‐refocused spin echo

TG Reese, O Heid, RM Weisskoff… - Magnetic Resonance in …, 2003 - Wiley Online Library
Abstract Image distortion due to field gradient eddy currents can create image artifacts in
diffusion-weighted MR images. These images, acquired by measuring the attenuation of
NMR signal due to directionally dependent diffusion, have recently been shown to be ...

[CITAS] Rotational-echo double-resonance NMR

T Gullion, J Schaefer - Journal of magnetic resonance, 1989 -
... Titre du document / Document title. Rotational-echo double-resonance NMR. Auteur(s) /
Author(s). GULLION T. (1) ; SCHAEFER J. ; Affiliation(s) du ou des auteurs / Author(s)
Affiliation(s). ... Etude expérimentale. ; Echo rotationnel. ; Mots-clés espagnols / Spanish Keywords. ...

A model for non-Rayleigh sea echo

E Jakeman, P Pusey - Antennas and Propagation, IEEE …, 1976 -
Abstract A mathematical model for non-Rayleigh microwave sea echo is developed which
describes explicitly the dependence of statistical properties of the radar cross section on the
area of sea surface illuminated by the radar. In addition to the first probability distribution ...

Echo‐planar time course MRI of cat brain oxygenation changes

R Turner, DL Bihan, CTW Moonen… - Magnetic …, 1991 - Wiley Online Library
Abstract When deoxygenated, blood behaves as an effective susceptibility contrast agent.
Changes in brain oxygenation can be monitored using gradient-echo echo-planar imaging.
With this technique, difference images also demonstrate that blood oxygenation is ...

Breakdown of echo suppression in the precedence effect

RK Clifton - The Journal of the Acoustical Society of America, 1987 -
... Specifically, we ob- served a release from the inhibitory influence of the prece- dence effect,resulting in localization of both the direct sound source and the echo sound... Frequency, intensity, and duration of direct and echo sounds may affect the extent of the effect. ...

Auditory processing of sound sources: Is there an echo in here?

WA Yost, SJ Guzman - Current Directions in Psychological Science, 1996 - JSTOR
Bonica, JJ (1990). Biochemistry and modulation of nociception and pain. In JJ Bonica (Ed.), The management of pain (Vol. 1, pp. 95-121). Philadelphia: Lea & Febiger. Bruehl, S., Carlson, C, & McCubbin, JA (1992). The relationship between pain sensitivity and blood ...

Echo sound apparatus including an oscillating mirror for use in medical diagnosis

J Dory - US Patent 4,274,421, 1981 - Google Patents
[57] ABSTRACT An echo sounding apparatus which includes an ultrasonic transmitter-receiver probe 3 generating a horizontal ultrasonic beam and a mirror 4 inclined at 45 with respect to the said beam and driven by a torque motor 5 for oscillatory conical motion ...

[CITAS] Auditory localization(Binaural acoustic field sampling, head movement and echoeffect in auditory localization of sound sources position, distance and …

AW Mills - Foundations of modern auditory theory., 1972

[CITAS] Tables of the velocity of sound in pure water and sea water for use in echo-sounding and sound-ranging

DJ Matthews - 1939 - Published for the Hydrographic Dept …

[PDF] Mapping subglacial surfaces of tetnperate valley glaciers by two-pass tnigration of a radio-echo sounding survey

BC Welch, A RACT - Journal qfGlaciology, 1998 -
... Resolution ?f three-dimensIOnal maps of subglacial surfaces is determined by the radio-echosound- 1l1g wavelength, data spacing in the field, and migration. ... Detection is simply the ability of a radio-echo sound ing device to record the energy reflected by an interface. ...

Automotive multi-speaker audio system with automatic echo-control feature

J Kasai, H Imai, H Tsuda - US Patent 4,694,497, 1987 - Google Patents
... audio signal path. An echo system is provided with the second audio signal path, which echosystem provides echo sound component for the audio sound to be reproduced through the second main amplifier. The echo system ...

[CITAS] Acoustic assessment of fish abundance and distribution

SB Brandt - Fisheries techniques, 2nd edition. American Fisheries …, 1996

Analysis of frequency-modulated sounds by auditory neurones ofecho-locating bats.

N Suga - The Journal of physiology, 1965 -
METHODS Little brown bats, Myotis lucifugus, anaesthetizedwith 45mg/kg Nembutal (pentobarbital sodium) were held in a special holder (Suga, 1964a) in an electrically shielded room at 35370 C. The inferior colliculus was easily exposed since it protrudes ...

Measurements of atmospheric attenuation at ultrasonic frequencies and the significance for echolocation by bats

BD Lawrence, JA Simmons - The Journal of the Acoustical Society of …, 1982 -
... x'xø The distances at which bats first react to targets provide some indication of the maximumopera- ting range of echolocation, 9 and the echo sound-pres- sure levels reaching the bat's ears when these reac- tions are first noticed have been estimated x using the results of ...

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