26,926 research outputs found
NEW PANNING-VIDEOGRAPHY STRATEGIES FOR THE UNDEWATER MOTION ANALYSIS
The purpose of this study was to evaluate, through simulation, two new panning-videography strategies based on single continuous control volume (continuous-volume approach) in an effort to overcome the shortcomings of the previously reported method that was based on a set of discrete control volumes (discrete-volume approach). Two continuous-volume strategies were tested: the large-frame strategy and the small-frame strategy. A series of camera calibrations were performed based on a theoretical refraction model and an imaginary experimental setup. Both strategies provided continuous DLT parameter-pan angle curves and demonstrated the potential to provide more reliable calibration results than the discrete-volume approach with less discontinuity in the reconstructed object space and less chance of extrapolation
A CAMERA CALIBRATION ALGORITHM FOR THE UNDERWATER MOTION ANALYSIS
A new camera calibration algorithm was developed though hybridisation of a geometric refraction-correction procedure and the 2D DLT method. For evaluation, the calibration errors in the image-plane coordinates were computed and compared with those obtained from the 3D DLT method in a simulated calibration trial. It was concluded that the new algorithm has potential advantages over the 3D DLT method in terms of the maximum calibration error and the extrapolation error
HOW TO WRITE MANUSCRIPTS AND RESPOND TO REVIEWERS' COMMENTS FOR 'SPORTS BIOMECHANICS'
The purpose of this paper is to outline the fundamental writing principles for the manuscripts to be submitted to Sports Biomechanics and how to respond to the reviewers' comments after a review. General and section-specific writing guidelines are presented along with the recommendations for the preparation of the point-by-point responses to the reviewers' comments
Relation between Kitaev magnetism and structure in -RuCl
Raman scattering has been employed to investigate lattice and magnetic
excitations of the honeycomb Kitaev material -RuCl and its
Heisenberg counterpart CrCl. Our phonon Raman spectra give evidence for a
first-order structural transition from a monoclinic to a rhombohedral structure
for both compounds. Significantly, only -RuCl features a large
thermal hysteresis, consistent with the formation of a wide phase of
coexistence. In the related temperature interval of K, we observe a
hysteretic behavior of magnetic excitations as well. The stronger magnetic
response in the rhombohedral compared to the monoclinic phase evidences a
coupling between the crystallographic structure and low-energy magnetic
response. Our results demonstrate that the Kitaev magnetism concomitant with
fractionalized excitations is susceptible to small variations of bonding
geometry.Comment: 9 pages, 8 figures, To appear in PR
Superconductivity-induced Phonon Renormalization on NaFeCoAs
We report a study of the lattice dynamics in superconducting NaFeAs (Tc = 8
K) and doped NaFe0.97Co0.03As (Tc = 20 K) using Raman light scattering. Five of
the six phonon modes expected from group theory are observed. In contrast with
results obtained on iso-structural and iso-electronic LiFeAs, anomalous
broadening of Eg(As) and A1g(Na) modes upon cooling is observed in both
samples. In addition, in the Co-doped sample, a superconductivity-induced
renormalization of the frequency and linewidth of the B1g(Fe) vibration is
observed. This renormalization can not be understood within a single band and
simple multi-band approaches. A theoretical model that includes the effects of
SDW correlations along with sign-changing s-wave pairing state and interband
scattering has been developed to explain the observed behavior of the B1g(Fe)
mode.Comment: 10 pages; 6 figure
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