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 α\alpha-RuCl3_3

Raman scattering has been employed to investigate lattice and magnetic excitations of the honeycomb Kitaev material $\alpha$-RuCl$_3$ and its Heisenberg counterpart CrCl$_3$. Our phonon Raman spectra give evidence for a first-order structural transition from a monoclinic to a rhombohedral structure for both compounds. Significantly, only $\alpha$-RuCl$_3$ features a large thermal hysteresis, consistent with the formation of a wide phase of coexistence. In the related temperature interval of $70-170$ 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 NaFe1−x_{1-x}Cox_{x}As

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