Microscopic calculation of the spin-dependent neutron scattering lengths on 3He

We report on the spin.dependent neutron scattering length on 3He from a microscopic calculation of p-3H, n-3He, and d-2H scattering employing the Argonne v18 nucleon-nucleon potential with and without additional three-nucleon force. The results and that of a comprehensive R-matrix analysis are compared to a recent measurement. The overall agreement for the scattering lengths is quite good. The imaginary parts of the scattering lengths are very sensitive to the inclusion of three-nucleon forces, whereas the real parts are almost insensitive.Comment: 9 pages, 1 figur

More Than Speed? an Empirical Study of Touchscreens and Body Awareness on an Object Manipulation Task

Touchscreen interfaces do more than allow users to execute speedy interactions. Three interfaces (touchscreen, mouse-drag, on-screen button) were used in the service of performing an object manipulation task. Results showed that planning time was shortest with touch screens, that touchscreens allowed high action knowledge users to perform the task more efficiently, and that only with touchscreens was the ability to rotate the object the same across all axes of rotation. The concept of closeness is introduced to explain the potential advantages of touchscreen interfaces