1,422 research outputs found
Design of an Advanced Portable System for High Density Surface EMG Recording with Wireless Control of Signal Quality
High density surface EMG (HD-sEMG) is a technique for evaluating and recording the electrical activity produced by muscles by placing a 2-dimensional (2D) grid (comprising many closely spaced electrodes with 3~10 mm center-to-center), instead of just a few electrodes, on the muscles. The advantage of HD-sEMG over intramuscular (needle) EMG, apart from the non-invasiveness and the relative ease of obtaining spatial distributions of electrical muscle activity, is its high reproducibility in follow up studies. Despite the importance of HD-sEMG in many fields (such as a valuable aid in discovering and diagnosing abnormalities not only in the muscles but also in the motor system as a whole), the development of HD-sEMG detecting and recording system is considered to be quite behind technology nowadays. It is necessary to develop a new generation HD-sEMG detecting and recording device in order to meet the requirements in more channels, higher resolution and portable, which is why the design of an advanced portable system for high density surface EMG recording with wireless control of signal quality (HD-sEMG RSWC) is proposed.
In this thesis, the design of a portable system for high density surface EMG recording with wireless control of signal quality (HD-sEMG RSWC) is going to be proposed. A prototype (including hardware, firmware and control panel) is going to be implemented and its performances are going to be tested. Physiological applications using this prototype to acquire EMG signals from biceps brachii muscle and dorsal forearm muscles during contractions are going to be studied.
The HD-sEMG prototype satisfied the design criteria defined in the thesis and has advantage of 64-channel cable-free signal quality control (The existing commercial available product is only 32-channel wirelessly).
In first application (EMG signals acquired from biceps brachii muscle), motor unit action potentials (MUAPs) produced by motor units of biceps brachii were detected . Information concerning the innervation zone (IZ) and conduction velocity of the MUAP can be obtained from all columns showing the MUAP. Location of the IZ can be estimated, by visual inspection. Conduction velocity (CNV) can be estimated as the ratio between the distance D travelled by the MUAP in the time interval T.
The second physiological application (EMG signals acquired from dorsal forearm muscles ) shows that the spatial properties of the monopolar EMG amplitude distribution (RMS) over the proximal portion of dorsal forearm can be used to discriminate different contractions. Active areas by different contractions of different subjects can be the same, such as subject3 (wrist extension) and subject1 (middle finger extension)
A note on Maxwell's equal area law for black hole phase transition
The state equation of the charged AdS black hole is reviewed in the
plane. Thinking of the phase transition, the , , graphs are
plotted and then the equal area law is used in the three cases to get the phase
transition point (P,T). The analytical phase transition point relations for P-T
of charged AdS black hole has been obtained successfully. By comparing the
three results, we find that the equal area law possibly cannot be used directly
for plane. According to the , results, we plot the
graph and find that for a highly charged black hole a very low temperature
condition is required for the phase transition
Analysis and Processing on the Composing of Noun Conglomeration Combination
PACLIC 20 / Wuhan, China / 1-3 November, 200
Prolongation Approach to B\"{a}cklund Transformation of Zhiber-Mikhailov-Shabat Equation
The prolongation structure of Zhiber-Mikhailov-Shabat (ZMS) equation is
studied by using Wahlquist-Estabrook's method. The Lax-pair for ZMS equation
and Riccati equations for pseudopotentials are formulated respectively from
linear and nonlinear realizations of the prolongation structure. Based on
nonlinear realization of the prolongation structure, an auto-Bcklund
transformation of ZMS equation is obtained.Comment: Revtex, no figures, to appear in J. Math. Phys. (1996
A New Phase Transition Related to the Black Hole's Topological Charge
The topological charge of AdS black hole is introduced in
Ref.[1,2], where a complete thermodynamic first law is obtained. In this paper,
we investigate a new phase transition related to the topological charge in
Einstein-Maxwell theory. Firstly, we derive the explicit solutions
corresponding to the divergence of specific heat and determine
the phase transition critical point. Secondly, the curve and curve
are investigated and they exhibit an interesting van der Waals system's
behavior. Critical physical quantities are also obtained which are consistent
with those derived from the specific heat analysis. Thirdly, a van der Waals
system's swallow tail behavior is observed when in the
graph. What's more, the analytic phase transition coexistence lines are
obtained by using the Maxwell equal area law and free energy analysis, the
results of which are consistent with each other.Comment: 11 pages, 5 figure
Attractive Interaction between Vortex and Anti-vortex in Holographic Superfluid
Annihilation process of a pair of vortices in holographic superfluid is
numerically simulated. The process is found to consist of two stages which are
amazingly separated by vortex size . The separation distance
between vortex and anti-vortex as a function of time is well fitted by , where the scaling exponent for , and
for . Then the approaching velocity and acceleration as
functions of time and as functions of separation distance are obtained. Thus
the attractive force between vortex and anti-vortex is derived as
for the first stage, and for the second stage. In the end, we explained why the
annihilation rate of vortices in turbulent superfluid system obeys the two-body
decay law when the vortex density is low.Comment: 14 pages, 5 figure
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