phase coherence


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phase coherence

A term used in MRI referring to the degree to which precessing nuclear spins are synchronous—i.e., the degree to which the peaks and troughs
of their waveforms coincide.
References in periodicals archive ?
The difference of ASSRs phase between the two groups was further analyzed, using phase locking factor (PLF) and inter-trial phase coherence (ITPC) index, respectively.
Thus, it can be said that the PS measure used in this work is more related to PLF (circular variance) rather than to phase coherence (consistency of phase differences), applied channel-wise.
The measure R (see (3)) expresses the average phase coherence of a couple of N point segments, with 1 and 0 to be the limits of a strong and a weak coupling, respectively [24].
and the mean phase coherence [lambda] between a pair of ECoG signals [x.sub.1](t) and [x.sub.2](t) was calculated as
AD versus bvFTD: 17 features resulted in significant differences with GC and phase coherence [beta]1 reaching the lowest p value of 7.21e - 8 at T7/T8.
In the long time limit, where we have [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII], this leads to the field induced destruction of the phase coherence when approximately one flux penetrates the area [L.sup.2.sub.B] = D[[tau].sub.B].
Tables 1, 2, and 3 show the performance of the proposed metric as well as some leading metrics such as CPBD metric [17], JNBM metric [15], local kurtosis based metric (LKM) [13], local phase coherence metric (LPC) [8], Marziliano metric [6], Laplacian metric [37], Marichal metric [38], Shaked-Tastl metric [39], BLIINDS-II metric [18], Liu metric [25], Barland metric [24], and FR metric PSNR.
The negative refractive index of the atomic vapor presented in the paper is achieved based on the mixed-parity dressed-state assisted resonance as well as quantum coherence (atomic phase coherence).
Advances in nanotechnology opened the way for the synthesis of artificial nanostructures with sizes smaller than the phase coherence length of the carriers [1].
Among specific topics are what computers need to know about verbs, visual ontology construction and concept detection for multimedia indexing and retrieval, semantics of software modeling, social and expert research in online communities, phase coherence in conceptual spaces for conversational agents, and from semantic objects to structured natural language.
However, for the additional target applications, the carrier-envelope phase coherence is more important.
However, with arbitrary timing, the phase transients required for phase coherence preclude phase continuity.