Movement Coordination during Forward and Backward Rope Jumping: A Relative Phase Study

The study of the relative phase between strong and electromagnetic amplitudes is of great importance for understanding the dynamics of charmonium decays. The information of the phase can be obtained model-independently by fitting the scan data of some special decay channels, one of which is ψ′ →K+K-. To find out the optimal data taking strategy for a scan experiment in the measurement of the phase in ψ′ →K+ K-, the minimization process is analyzed from a theoretical point of view. The result indicates that for one-parameter fit, only one data taking point in the vicinity of a resonance peak is sufficient to acquire the optimal precision. Numerical results are obtained by fitting simulated scan data. Besides the results related to the relative phase between strong and electromagnetic amplitudes, the method is extended to analyze the fits of other resonant parameters, such as the mass and the total decay width of ψ′.

Download Full-text

Human movement coordination implicates relative direction as the information for relative phase

Experimental Brain Research ◽

10.1007/s00221-005-2301-2 ◽

2005 ◽

Vol 165 (3) ◽

pp. 351-361 ◽

Cited By ~ 44

Author(s):

Andrew D. Wilson ◽

David R. Collins ◽

Geoffrey P. Bingham

Keyword(s):

Relative Phase ◽

Human Movement ◽

Movement Coordination ◽

Relative Direction

Download Full-text

Effect of badminton shoe sole on the lunge skill performance: in the viewpoint of coordination

Leather and Footwear Journal ◽

10.24264/lfj.21.2.4 ◽

2021 ◽

Vol 21 (2) ◽

pp. 119-126

Author(s):

Guanchun LIU ◽

Yuqi LI ◽

Quting HUANG ◽

Jin ZHOU ◽

Wing-Kai LAM

Keyword(s):

High Resolution ◽

Phase Angle ◽

Relative Phase ◽

Recovery Phase ◽

Movement Coordination ◽

Ankle Kinematics ◽

Skill Performance ◽

Ankle Joints ◽

Continuous Relative Phase ◽

Motion Capturing

Badminton lunge requires rapid coordination between the knee and ankle joints and it is accompanied by fast contact between the shoe’s sole and the floor. Phase angle analysis is a protocol with high resolution and relating to the coordination, but how the shoe’s sole would affect the lunge performance was not clear in terms of coordination. Thereby, the aim of this study was to applied phase angle analysis to insight the lunge process, then to disclose the effect of badminton shoe’s sole on the lunge skill performance. Eleven elite badminton players performed five left-forward maximum lunge trials with wearing Rounded Heel Shoe (RHS), Flattened Heel Shoe (FHS), and Standard Heel Shoes (SHS). The motion capturing system was used to measure the knee and ankle kinematics information. The Phase Angle (PA), continuous relative phase (CRP) and variability of continuous relative phase (VCRP) between the knee and ankle joints were then calculated for both forward lunge phase and recovery phase in each of the three shoes. Current findings indicated that players wearing RHS had certain advantages on better movement coordination than other shoes, as indicated by better PA and CRP. The findings of this study would be helpful to understand the coordination of badminton lunges and explain the synergy between the lower extremity ankle and knee joint to minimize the possibility of injury in badminton. Furthermore, the coordination between the knee and ankle joints was greatly affected by the structure of the shoe heel design.

Download Full-text

Human movement coordination implicates relative direction as the information for relative phase

Journal of Vision ◽

10.1167/5.8.346 ◽

2010 ◽

Vol 5 (8) ◽

pp. 346-346

Author(s):

A. D. Wilson ◽

D. R. Collins ◽

G. P. Bingham

Keyword(s):

Relative Phase ◽

Human Movement ◽

Movement Coordination ◽

Relative Direction

Download Full-text

Friedel'S law breakdown and interpretation of stacking fault images in tetrahedral semiconductors

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100126408 ◽

1987 ◽

Vol 45 ◽

pp. 318-319

Author(s):

Rob. W. Glaisher ◽

A.E.C. Spargo

Keyword(s):

Relative Phase ◽

Point Group ◽

Binary Compound ◽

Stacking Fault ◽

Fold Axis ◽

Atom Pair ◽

Tetrahedral Semiconductors ◽

Group Symmetries ◽

Thin Crystal ◽

Phase Differences

Images of <11> oriented crystals with diamond structure (i.e. C,Si,Ge) are dominated by white spot contrast which, depending on thickness and defocus, can correspond to either atom-pair columns or tunnel sites. Olsen and Spence have demonstrated a method for identifying the correspondence which involves the assumed structure of a stacking fault and the preservation of point-group symmetries by correctly aligned and stigmated images. For an intrinsic stacking fault, a two-fold axis lies on a row of atoms (not tunnels) and the contrast (black/white) of the atoms is that of the {111} fringe containing the two-fold axis. The breakdown of Friedel's law renders this technique unsuitable for the related, but non-centrosymmetric binary compound sphalerite materials (e.g. GaAs, InP, CdTe). Under dynamical scattering conditions, Bijvoet related reflections (e.g. (111)/(111)) rapidly acquire relative phase differences deviating markedly from thin-crystal (kinematic) values, which alter the apparent location of the symmetry elements needed to identify the defect.

Download Full-text