207 research outputs found
Mathematical modelling – tool to diagnosis of human apparatus
There is presented a model of human gait based on power developed by muscle joints in this paper. The mathematical model was presented for healthy subjects, patients with gonarthrosis and patients with Anterior Cruciate Ligaments (ACL). The regression function and the stochastic approximation function were used to the modeling. The differences between the values of model’s coefficients of people with these two pathologies have been compared to the model’s coefficients of healthy subjects. Proposed model is very accurate. The modeling could help to define the level of gait pathology and treatment in a large number of patient
Different techniques for EMG signal processing
Electromyography signal can be used for biomedical applications. It is complicated in interpretation, so it acquires advanced methods for detection, decomposition, processing, and classification. The techniques of EMG signal analysis such as: filtering, wavelet transform, and modeling will be presented in this paper to provide efficient and effective ways of understanding the signal. A comparison study is also given to show performance of various EMG signal analysis methods. This paper provides researchers a good understanding of EMG signal and its analysis procedures. This knowledge will help to develop more flexible and efficient application
The suboptimal set of parameters describing human gait
The influence of choosing a set of parameters describing human gait for automatic gait analysis and assessment has been presented in this paper. The investigations were based on three sets of parameters and two different classificators. The conclusion is that the best set of parameters is set of coefficients which have been obtained by modelling of human gait by means of identification using the regression functio
Light-by-light scattering sum rules constraining meson transition form factors
Relating the forward light-by-light scattering to energy weighted integrals
of the \gamma* \gamma -fusion cross sections, with one real photon (\gamma) and
one virtual photon (\gamma*), we find two new exact super-convergence
relations. They complement the known super-convergence relation based on the
extension of the GDH sum rule to the light-light system. We also find a set of
sum rules for the low-energy photon-photon interaction. All of the new
relations are verified here exactly at leading order in scalar and spinor QED.
The super-convergence relations, applied to the \gamma* \gamma -production of
mesons, lead to intricate relations between the \gamma \gamma -decay widths or
the \gamma* \gamma -transition form factors for (pseudo-) scalar, axial-vector
and tensor mesons. We discuss the phenomenological implications of these
results for mesons in both the light-quark sector and the charm-quark sector.Comment: 32 pages, 7 figure
Different techniques for EMG signal processing
Electromyography signal can be used for biomedical applications. It is complicated in interpretation, so it acquires advanced methods for detection, decomposition, processing, and classification. The techniques of EMG signal analysis such as: filtering, wavelet transform, and modeling will be presented in this paper to provide efficient and effective ways of understanding the signal. A comparison study is also given to show performance of various EMG signal analysis methods. This paper provides researchers a good understanding of EMG signal and its analysis procedures. This knowledge will help to develop more flexible and efficient application
Mathematical modelling – tool to diagnosis of human apparatus
There is presented a model of human gait based on power developed by muscle joints in this paper. The mathematical model was presented for healthy subjects, patients with gonarthrosis and patients with Anterior Cruciate Ligaments (ACL). The regression function and the stochastic approximation function were used to the modeling. The differences between the values of model’s coefficients of people with these two pathologies have been compared to the model’s coefficients of healthy subjects. Proposed model is very accurate. The modeling could help to define the level of gait pathology and treatment in a large number of patient
Analyticity constraints for hadron amplitudes : going high to heal low energy issues
Analyticity constitutes a rigid constraint on hadron scattering amplitudes. This property is used to relate models in different energy regimes. Using meson photoproduction as a benchmark, we show how to test contemporary low-energy models directly against high-energy data. This method pinpoints deficiencies of the models and treads a path to further improvement. The implementation of this technique enables one to produce more stable and reliable partial waves for future use in hadron spectroscopy and new physics searches
Determination of the pole position of the lightest hybrid meson candidate
Mapping states with explicit gluonic degrees of freedom in the light sector
is a challenge, and has led to controversies in the past. In particular, the
experiments have reported two different hybrid candidates with spin-exotic
signature, pi1(1400) and pi1(1600), which couple separately to eta pi and eta'
pi. This picture is not compatible with recent Lattice QCD estimates for hybrid
states, nor with most phenomenological models. We consider the recent partial
wave analysis of the eta(') pi system by the COMPASS collaboration. We fit the
extracted intensities and phases with a coupled-channel amplitude that enforces
the unitarity and analyticity of the S-matrix. We provide a robust extraction
of a single exotic pi1 resonant pole, with mass and width 1564 +- 24 +- 86 MeV
and 492 +- 54 +- 102 MeV, which couples to both eta(') pi channels. We find no
evidence for a second exotic state. We also provide the resonance parameters of
the a2(1320) and a2'(1700).Comment: 6 pages + 3 pages of supplemental material. Version to appear on
Phys.Rev.Let
Correction of planovalgus deformity through rotational reinsertion of the lateral layers of the achilles tendons in ambulatory children with cerebral palsy
Achilles tendon, cerebral palsy, foot pressure, planovalgus, surger
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