1,720,988 research outputs found
Experimental high accuracy measurement in ultrasonic compass
No full textA procedure to identify useful echoes
parameters pre-estimation in an ultrasonic signal, to allow
the application off line of a Modified Maximum Likelihood
Estimator (M.L.E.) [1] as been faced. An experimental
application, utilizing an ultrasonic medical scanner,
sampled by an acquisition board is also presented
Un modello unitario per interpretare i processi di aggregazione, rappresentazione ed apprendimento. Leggi generali e locali
No full textNew Pll System To High Accuracy Ultrasound Measurement
No full textUltrasound signal, received by an ultrasound (U.S.) machine from target under observation, has an impulsive
form. Actual systems use a non-linear stage, as a
logarithmic amplifier, to get its amplitude demodulation
and to display it on U.S. scanner monitor. This work
proposes an idea to realize a new input stage based on
phase locked loop (PLL) system to obtain a more accurate
amplitude demodulation. PLL, is an inherently slow
system and it needs several cycles to reach phase lock, so
it must be modified by means with a delay locked loop
(DLL) to obtain more quickness from PLL. A first system
has been realized and experimental results confirm the
goodness of our idea
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Diagnostics of Electric Power Equipment by Discriminating Signals Coming from Different Sources
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