Background. It is well known that overarm throwing is one of the most performed activities in the handball. Shoulder and glenohumeral injuries incidence are high in handball because of both pass, and shooting activity was executed repeatedly in high angular speed. Objectives. This study set out to investigate the usefulness of inexpensive commercial inertial movement sensors for prediction of ...

Design, fabrication, and testing of multi-axis CMOS piezoresistive accelerometers is described. Vertical axis accelerometers have been fabricated in multiple processes using a production tested maskless bulk etch step. Horizontal axis accelerometers have also been fabricated and require an additional assembly step. Acceleration sensing in based on the piezoresistive behavior of the gate polysil...

Diagnostic for investigating and distinguishing different laser ion acceleration mechanisms has been developed and successfully tested. An ion separation wide angle spectrometer can simultaneously investigate three important aspects of the laser plasma interaction: (1) acquire angularly resolved energy spectra for two ion species, (2) obtain ion energy spectra for multiple species, separated ac...

Dynamic impact responses and brain tissue deformations from helmeted centric and non-centric headform impacts were assessed with respect to suggested concussive injury thresholds from the literature. Results from six commercially available ice hockey helmets were compared statistically. It is proposed that the current centric impact standards for ice hockey helmets measuring linear acceleration...

Design, fabrication, and testing of multi-axis CMOS piezoresistive accelerometers is described. Vertical axis accelerometers have been fabricated in multiple processes using a production tested maskless bulk etch step. Horizontal axis accelerometers have also been fabricated and require an additional assembly step. Acceleration sensing in based on the piezoresistive behavior of the gate polysil...

In this paper the problem of the speed estimation of an Unmanned Aerial Vehicle is addressed, when only the standard outputs (acceleration, angles and angular speeds) are available for measurement. We focus our analysis on a prototype drone a 4 rotors helicopter robotwhich is not equipped with GPS related devices and relies on the Inertial Measurement Unit (IMU) only. Two different approaches h...

We analyzed the results of non-linear resistive magnetohydrodynamical (MHD) simulations of jet formation to study the acceleration mechanism of axisymmetric, resistive MHD jets. The initial state is a constant angular momentum, polytropic torus threaded by weak uniform vertical magnetic fields. The time evolution of the torus is simulated by applying the CIP-MOCCT scheme extended for resistive ...

The surprising lack of a high energy cutoff in the cosmic ray spectrum at the highest energies together with an apparently isotropic distribution of arrival directions have strongly challenged most models proposed for the acceleration of ultra high energy cosmic rays. Young neutron star winds may be able to explain the mystery. We discuss this recent proposal after summarizing the observational...

Design, fabrication, and testing of multi-axis CMOS piezoresistive accelerometers is described. Vertical axis accelerometers have been fabricated in multiple processes using a production tested maskless bulk etch step. Horizontal axis accelerometers have also been fabricated and require an additional assembly step. Acceleration sensing in based on the piezoresistive behavior of the gate polysil...

15 Skilled throwers achieve accuracy in overarm throwing by releasing the ball on the handpath 16 with a timing precision as low as one millisecond. It is generally believed that this remarkable 17 ability results from a precisely timed command from the brain that opens the fingers. 18 Alternatively, precise timing of ball release could result from a backforce from the ball that 19 pushes the f...