14 research outputs found
The simulation of aerial movement—IV. A computer simulation model
A computer simulation model of human airborne movement is described. The body is modelled
as 11 rigid linked segments with 17 degrees of freedom which are chosen with a view to modelling
twisting somersaults. The accuracy of the model is evaluated by comparing the simulation values
of the angles describing somersault, tilt and twist with the corresponding values obtained from film
data of nine twisting somersaults. The maximum deviations between simulation and film are found
to be 0.04 revolutions for somersault, seven degrees for tilt and 0.12 revolutions for twist. It is shown
that anthropometric measurement errors, from which segmental inertia parameters are calculated,
have a small effect on a simulation, whereas film digitization errors can account for a substantial
part of the deviation between simulation and film values
Pulsar-wind nebulae and magnetar outflows: observations at radio, X-ray, and gamma-ray wavelengths
We review observations of several classes of neutron-star-powered outflows:
pulsar-wind nebulae (PWNe) inside shell supernova remnants (SNRs), PWNe
interacting directly with interstellar medium (ISM), and magnetar-powered
outflows. We describe radio, X-ray, and gamma-ray observations of PWNe,
focusing first on integrated spectral-energy distributions (SEDs) and global
spectral properties. High-resolution X-ray imaging of PWNe shows a bewildering
array of morphologies, with jets, trails, and other structures. Several of the
23 so far identified magnetars show evidence for continuous or sporadic
emission of material, sometimes associated with giant flares, and a few
possible "magnetar-wind nebulae" have been recently identified.Comment: 61 pages, 44 figures (reduced in quality for size reasons). Published
in Space Science Reviews, "Jets and Winds in Pulsar Wind Nebulae, Gamma-ray
Bursts and Blazars: Physics of Extreme Energy Release
Intake, digestibility, and ruminal parameters of Nellore bulls supplemented with increasing levels of crude glycerin in Brachiaria Brizantha pastures
Yacht sail aerodynamics Part 2; achievable mainsail specification
SIGLEAvailable from British Library Document Supply Centre- DSC:5294.94(LUT-TT--8904) / BLDSC - British Library Document Supply CentreGBUnited Kingdo
Yacht sail aerodynamics Part 1; optimising overall performance
SIGLEAvailable from British Library Document Supply Centre- DSC:5294.94(LUT-TT--8903) / BLDSC - British Library Document Supply CentreGBUnited Kingdo
Yacht sail aerodynamics Part 3; achievable jibsail specification
SIGLEAvailable from British Library Document Supply Centre- DSC:5294.94(LUT-TT--8905) / BLDSC - British Library Document Supply CentreGBUnited Kingdo