Boxing Punch Detection with Single Static Camera.

Computer vision in sports analytics is gaining in popularity. Monitoring players' performance using cameras is more flexible and does not interfere with player equipment compared to systems using sensors. This provides a wide set of opportunities for computer vision systems that help coaches, reporters, and audiences.

The effect of transverse wavefront width on specular neutron reflection.

In the analysis of neutron scattering measurements of condensed matter structure, it normally suffices to treat the incident and scattered neutron beams as if composed of incoherent distributions of plane waves with wavevectors of different magnitudes and directions that are taken to define an instrumental resolution. However, despite the wide-ranging applicability of this conventional treatment, there are cases, such as specular neutron reflectometry, in which the structural length scales of the scattering object require that the wavefunction of an individual neutron in the beam be described by a spatially localized packet - in particular with respect to the transverse extent of its wavefronts ( normal to the packet's mean direction of propagation). It is shown in the present work that neutron diffraction patterns observed for periodic transmission phase gratings, as well as specular reflection measurements from patterned thin films with repeat units of the order of micrometres, can be accurately described by associating an individual neutron with a wave packet and treating a beam as a collection of independent packets.

Method for the definitive detection of orbital angular momentum states in neutrons by spin-polarized He.

A standard method to detect thermal neutrons is the nuclear interaction He(n,p)H. The spin dependence of this interaction is also the basis of a neutron spin-polarization filter using nuclear polarized He. We consider the corresponding interaction for neutrons placed in an intrinsic orbital angular momentum (OAM) state.

Real-World Data Difficulty Estimation with the Use of Entropy.

In the era of the Internet of Things and big data, we are faced with the management of a flood of information. The complexity and amount of data presented to the decision-maker are enormous, and existing methods often fail to derive nonredundant information quickly. Thus, the selection of the most satisfactory set of solutions is often a struggle.

Resonant X-ray Emission and Valence-band Lifetime Broadening in LiNO.

X-ray absorption and resonant inelastic x-ray scattering measurements are carried out on lithium nitrate LiNO. The nitrogen orbitals exhibit a large lifetime effect. Experimentally, this is manifest as an apparent weakening of the x-ray emission signal from these states, but a closer examination shows that instead it is due to extreme broadening.