Quantum-mechanical harmonic chain attached to heat baths. II. Nonequilibrium properties

U Zürcher, P Talkner - Physical Review A, 1990 - APS
We study nonequilibrium properties of a one-dimensional harmonic chain to whose ends
independent heat baths are attached which are kept at different temperatures. Using the …

Thermally activated escape over fluctuating barriers

U Zürcher, CR Doering - Physical Review E, 1993 - APS
We investigate the thermally activated escape of a Brownian particle over a potential barrier
whose height fluctuates with a rate α between the values E+ and E−. We are mainly …

Entropy of electromyography time series

M Kaufman, U Zurcher, PS Sung - Physica A: Statistical Mechanics and its …, 2007 - Elsevier
A nonlinear analysis based on Renyi entropy is applied to electromyography (EMG) time
series from back muscles. The time dependence of the entropy of the EMG signal exhibits a …

[PDF][PDF] Comparison of spectral and entropic measures for surface electromyography time series: a pilot study

PS Sung, U Zurcher, M Kaufman - Journal of rehabilitation research …, 2007 - academia.edu
In a previous study, we reported that the mean square displacement calculated from the surface
electromyography (sEMG) signal of low back muscles exhibits a plateaulike behavior for …

Stability during arboreal locomotion

AR Lammers, U Zurcher - Theoretical biomechanics, 2011 - books.google.com
Arboreal locomotion–traveling on the branches, twigs, and trunks of trees and woody shrubs–is
very common among mammals. Most primates, many rodents, marsupials, carnivores, …

Reliability difference between spectral and entropic measures of erector spinae muscle fatigability

PS Sung, U Zurcher, M Kaufman - Journal of Electromyography and …, 2010 - Elsevier
This study investigated back muscle fatigability of the erector spinae (ES) muscles during
submaximal contractions with the use of surface electromyography (sEMG). It was important to …

Torque around the center of mass: dynamic stability during quadrupedal arboreal locomotion in the Siberian chipmunk (Tamias sibiricus)

AR Lammers, U Zurcher - Zoology, 2011 - Elsevier
When animals travel on tree branches, avoiding falls is of paramount importance. Animals
swiftly running on a narrow branch must rely on movement to create stability rather than on …

[PDF][PDF] Gender differences in spectral and entropic measures of erector spinae muscle fatigue.

PS Sung, U Zurcher, M Kaufman - Journal of Rehabilitation Research …, 2008 - academia.edu
Electromyographic power spectral analysis is a valuable measurement; however, conflicting
results have been reported for amplitude and frequency changes during a fatiguing …

An instantaneous normal mode description of relaxation in supercooled liquids

T Keyes, GV Vijayadamodar, U Zurcher - The Journal of chemical …, 1997 - pubs.aip.org
A new paradigm of liquid state dynamics is emerging based upon instantaneous normal
modes INM. 1 The INM are the eigenfunctions of the force constant matrix, or Hessian, for a …

Nonlinear analysis of electromyography time series as a diagnostic tool for low back pain

PS Sung, U Zurcher, M Kaufman - Medical science monitor, 2005 - medscimonit.com
Background: A number of studies have evaluated lumbar spinal muscle fatigue using the
electromyography (EMG) signal. However, back muscle fatigue studies do not consistently …