منابع مشابه
Spin Echoes
Intense radiofrequency power in the form of pulses is applied to an ensemble of spins in a liquid placed in a large static magnetic Geld H&. The frequency of the pulsed r-f power satisGes the condition for nuclear magnetic resonance, and the pulses last for times which are short compared with the time in which the nutating macroscopic magnetic moment of the entire spin ensemble can decay. After...
متن کاملT1 Maps From Shifted Echoes and Stimulated Echoes
Theory The proposed sequence is shown in Figure 1. The basic idea is to obtain a spin echo (SE) and a stimulated echo (STE) with different T1 weighting for T1 calculation. In contrast to the FastPACE technique, both echoes were acquired separately. Then, only magnitude images are required which allows for exploiting the Half Fourier technique and using phased array coils. Acquisition of the tru...
متن کاملRegeneration of photon echoes with amplified photon echoes.
Photon-echo-based devices have been proposed for many applications in data storage, image processing, and optical communications. Many of these applications would benefit if the output from the photon-echo process could be used as input in a second photon-echo process. We demonstrate the generation of such secondary echoes, using the amplified output from an initial photon-echo process. The amp...
متن کاملEchoes and revival echoes in systems of anharmonically confined atoms
We study echoes and what we call “revival echoes” for a collection of atoms that are described by a single quantum wave function and are confined in a weakly anharmonic trap. The echoes and revival echoes are induced by applying two successive temporally localized potential perturbations to the confining potential, one at time t = 0, and a smaller one at time t = τ . Pulselike responses in the ...
متن کاملAthletic Training
annual Celebration of Student Research and Creative Activity. Undergraduate research, as one of the signature experiences of a Xavier education, allows our students to do more than study their discipline; instead they become practitioners of their discipline. In their classes, they may study philosophy, science and art; through research with faculty mentors, they become philosophers, scientists...
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ژورنال
عنوان ژورنال: Circulation
سال: 1977
ISSN: 0009-7322,1524-4539
DOI: 10.1161/01.cir.56.3.500