64 research outputs found
Precision and test-retest reliability of a large-scale British Pendulum designed to assess lateral edge shoe-surface friction at high impact velocities
Lateral edge friction variability in indoor sports shoes
It has previously been speculated that the occurrence and severity of lateral ankle sprain injuries is linked to excessive shoe-surface friction. The purpose of this study was to assess the amount of lateral edge friction in indoor sports shoes, and evaluate the variation from the traditional forefoot traction test. Therefore, we modified the ISO:12387:2019 test for slip resistance and positioned the shoe on its lateral edge while simulating a sideways movement. All tests were conducted on an indoor surface. In general, we found that lateral edge friction on average was 22% lower than forefoot friction (p<0.0001). However, linear regression showed that the forefoot test could only explain 63% of the variation in edge friction, thereby suggesting that a lateral test is needed to adequately inform on lateral edge friction. Future research is planned to determine whether a noticeable change in friction coefficient is also a ‘valuable change’, hence potentially having clinical implications for injury prevention
Monte Carlo study of linear chain submonolayer structures.Application to Li/W(112)
The lattice gas model for adsorption of alkaline elements on W(112) surface
is studied by Monte Carlo simulations. The model includes dipole--dipole
interaction as well as long-range indirect interaction. The numerical results
show that truncation of the indirect interaction even at 200 may change a
phase diagram, i.e., new phases containing domain walls might occur. It is
demonstrated that a defected phase can exist at high temperatures even if it is
not stable at T=0. The phase diagram for Li/W(112) is constructed and long
periodic chain structures (9*1), (6*1), (4*1), (3*1), and (2*1) are found to be
stable at low temperatures. Role of thermal fluctuation is discussed by
comparison of Monte Carlo results with mean field approximation results.Comment: 7 pages, 7 figures, REVTe
Lanczos exact diagonalization study of field-induced phase transition for Ising and Heisenberg antiferromagnets
Using an exact diagonalization treatment of Ising and Heisenberg model
Hamiltonians, we study field-induced phase transition for two-dimensional
antiferromagnets. For the system of Ising antiferromagnet the predicted
field-induced phase transition is of first order, while for the system of
Heisenberg antiferromagnet it is the second-order transition. We find from the
exact diagonalization calculations that the second-order phase transition
(metamagnetism) occurs through a spin-flop process as an intermediate step.Comment: 4 pages, 4 figure
What Characterises (Video-Recorded) Lateral Ankle Joint Injuries in Indoor and Court Sports? A Systematic Video Analysis of 445 Non Consecutive Case Series
The Noncontact Lateral Ankle Sprain Injury in Indoor and Court Sports is not just the result of a “bad landing”:A Systematic Video Analysis of 145 Non-consecutive Case Series
A model of linear chain submonolayer structures. Application to Li/W(112) and Li/Mo(112)
We propose a lattice gas model to account for linear chain structures
adsorbed on (112) faces of W and Mo. The model includes a dipole-dipole
interaction as well as a long-ranged indirect interaction. We have explicitly
demonstrated that the periodic ground states depend on a competition between
dipole-dipole and indirect interaction. The effect of temperature is studied
within the molecular-field approximation. The numerical results show that for
dipole-dipole interaction only, all long periodic linear chain phases are
suppressed to low temperatures. However, when the long-range indirect
interaction becomes important, the long-periodic linear chain phases start to
fill up the phase diagram and develop a high thermal stability. Model
parameters are chosen to reconstruct a sequence of long-periodic phases as
observed experimentally for Li/Mo(112) and Li/W(112).Comment: RevTeX 9 pages + 5 Postscript figures (included), uses newdoc.sty
(included), to be published in Surface Scienc
Metamagnetism in the 2D Hubbard Model with easy axis
Although the Hubbard model is widely investigated, there are surprisingly few
attempts to study the behavior of such a model in an external magnetic field.
Using the Projector Quantum Monte Carlo technique, we show that the Hubbard
model with an easy axis exhibits metamagnetic behavior if an external field is
turned on. For the case of intermediate correlations strength , we observe a
smooth transition from an antiferromagnetic regime to a paramagnetic phase.
While the staggered magnetization will decrease linearly up to a critical field
, uniform magnetization develops only for fields higher than .Comment: RevTeX 5 pages + 2 postscript figures (included), accepted for PRB
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