5,586 research outputs found
The Variable-Atmosphere Wave Tank
A facility was constructed for the study of water-entry,
water-exit, and underwater trajectory behavior of
small momentum-propelled missiles for varied trajectory
launching angles, missile accelerations and velocities,
wave fields and conditions of cavitation. A unique feature
is the electromagnetic missile propulsion system.
The facility is made principally of non-magnetic and
electrically non-conducting materials to permit the determination of missile accelerating force from the reactive force on the launching coil
Fluid Free Surface Proximity Effect on a Sphere Vertically Accelerated from Rest
Theory is developed to estimate the effect of free
surface proximity on the initial added mass of a sphere
accelerated vertically upward from rest in an ideal fluid.
It is assumed that the acceleration regime is sufficiently
brief that inertial forces predominate and gravitational
effects may be neglected. Results of tests in water indicate
that while there are slight viscous and gravitational effects
over the acceleration regime, the agreement between theory
and experiment is good. It is concluded that over briefer
acceleration regimes these effects would decrease and the
agreement would improve
Interactive effects of joint angle, contraction state and method on estimates of Achilles tendon moment arms
The muscle-tendon moment arm is an important input parameter for musculoskeletal models. Moment arms change as a function of joint angle and contraction state and depend on the method being employed. The overall purpose was to gain insights into the interactive effects of joint angle, contraction state and method on the Achilles tendon moment arm using the center of rotation (COR) and the tendon excursion method (TE). Moment arms were obtained at rest (TErest, CORrest) and during a maximum voluntary contraction (CORMVC) at four angles. We found strong correlations between TErest and CORMVC for all angles (0.72 ≤ r ≤ 0.93) with Achilles tendon moment arms using CORMVC being 33 - 36% greater than those obtained from TErest. The relationship between Achilles tendon moment arms and angle was similar across both methods and both levels of muscular contraction. Finally, Achilles tendon moment arms for CORrest were 1 – 8% greater than for CORMVC. [NB rendition of scientific symbols is approximate in this display; please check full text for precise rendition]
Real Fluid Effects on an Accelerated Sphere Before Boundary-Layer Separation
Studies were made on the apparent increase in mass on acceleration (added mass) of a sphere accelerated from rest and before boundary-layer separation, in cylinders
of various diameters filled with water or oil. From a comparison of theoretical and experimentally obtained added masses, the following conclusions were drawn: In the
absence of wall effects on the boundary layer, the wall shear stress over elements of the sphere can be approximated by the solution for the flat plate moving parallel to itself and the potential flow over the elements outside the boundary layer. The impulse on the elements is obtained by integration with respect to time, and the wall
drag and drag impulse on the sphere by integration over the sphere surface. Good theoretical and experimental agreement obtains under the assumption that a mass of fluid, estimated from the wall drag impulse, is carried in the boundary layer and may be university distributed over the sphere
"5 Days in August" – How London Local Authorities used Twitter during the 2011 riots
© IFIP International Federation for Information Processing 2012This study examines effects of microblogging communications during emergency events based on the case of the summer 2011 riots in London. During five days in August 2011, parts of London and other major cities in England suffered from extensive public disorders, violence and even loss of human lives. We collected and analysed the tweets posted by the official accounts maintained by 28 London local government authorities. Those authorities used Twitter for a variety of purposes such as preventing rumours, providing official information, promoting legal actions against offenders and organising post-riot community engagement activities. The study shows how the immediacy and communicative power of microblogging can have a significant effect at the response and recovery stages of emergency events
- …