The human requires attentive effort as assessed in dual-task experiments. Consistently, an attentive task can modify the walking pattern and a attention deficit and hyperactivity disorder (ADHD) is accompanied by gait modifications. Here we investigated the relationships between backward walking and attentive performances in ADHD children (n=13) and healthy age-, height and weight matched contr...

The impacts of solid spheres with the free surface have been studied for over one hundred years. In this thesis, the Worthington jets resulting from the impacts of hydrophobic and hydrophilic spheres with the free surface are studied experimentally. Several impact velocities and three materials of differing mass ratios are used. The resulting jets are characterized in terms of common non-dimens...

We investigated the effect of reduced gravity on the human walk-run gait transition speed and interpreted the results using an inverted-pendulum mechanical model. We simulated reduced gravity using an apparatus that applied a nearly constant upward force at the center of mass, and the subjects walked and ran on a motorized treadmill. In the inverted pendulum model for walking, gravity provides ...

The aim of this study is to test the validity of Froude number (NFr) or Strouhal number (Str) to determine intersubjects similar running patterns. Twenty male and eighteen female subjects ran barefoot on a runway equipped with a force platform. The running tests were performed in three experimental conditions. C0: all subjects ran at the same absolute velocity V=3.5 m.s; C1: the velocity was de...

BACKGROUND Ever since Gay-Lussac's time, the alcoholic strength by volume (% vol) has been determined by using densimetric measurements. The typical reference procedure involves distillation followed by pycnometry, which is comparably labour-intensive and therefore expensive. At present, infrared (IR) spectroscopy in combination with multivariate regression is widely applied as a screening proc...

In Figure 1F, the number 0.24 should be 2.4 instead. The incorrect Froude number given for human walking (0.24) corresponds to 1.5m/s, which is closer to the preferred speed of human walking. The correct number now given (2.4) corresponds to a speed of about 4.6m/s.