Many visual attributes of a target stimulus are computed according to dynamic, non-retinotopic reference frames. For example, the motion trajectory of a reflector on a bicycle wheel is perceived as orbital, even though it is in fact cycloidal in retinal, as well as spatial coordinates. We cannot perceive the cycloidal motion because the linear motion of the bike is discounted for. In other word...

We review and re-examine the description and separation of the spin and orbital angular momenta (AM) of an electromagnetic field in free space. While the spin and orbital AM of light are not separately meaningful physical quantities in orthodox quantum mechanics or classical field theory, these quantities are routinely measured and used for applications in optics. A meaningful quantum descripti...

1 Abstract: In the frame of the FAST20XX project under the supervision of ESA, two hybrid rocket engines are developed at Université Libre de Bruxelles (ULB) in collaboration with the Royal Military Academy of Belgium to assess the performance of paraffin/N2O propellants. The goal behind the study is to measure the regression rate and optimize the size of ALPHA, which is a sub-orbital vehicle d...

The objective of GOCE (Gravity Field and Steady-State Ocean Circulation Explorer) is the determination of the Earth’s gravity field with high spatial resolution. The main science sensor (the gradiometer) measures differential accelerations, from which the gravitational gradients, i.e. the matrix of the second derivatives of the gravitational potential, are derived. Some of them (the diagonal co...

Co-orbital systems contain two or more bodies sharing the same orbit around a planet star. The best-known flavors of co-orbital are tadpoles (in which bodies' angular separations oscillate about L4/L5 Lagrange points $60^\circ$ apart) and horseshoes (with periodically exchanging orbital energy to trace out horseshoe shape in co-rotating frame). Here, we use N-body simulations explore parameter ...

a generalization of the known results in fusion frames and $g$-frames theory to continuous fusion frames which defined by m. h. faroughi and r. ahmadi, is presented in this study. continuous resolution of the identity (cri) is introduced, a new family of cri is constructed, and a number of reconstruction formulas are obtained. also, new results are given on the duality of continuous fusion fram...

The orbital angular momentum (OAM) of light has been implemented as an information carrier in OAM holography. Holographic can be multiplexed theoretical unbounded channels, promoting the applications optically addressable dynamic display and high-security optical encryption. However, frame-rate extraction reconstruction process holography is physically determined by switching speed incident sta...