Small flying robots can perform landing maneuvers using bio-inspired optical flow by maintaining a constant divergence. However, optical flow is typically estimated from frame sequences recorded by standard miniature cameras. This requires processing full images on-board, limiting the update rate of divergence measurements, and thus the speed of the control loop and the robot. Event-based camer...

The reflectance of La0.7Ca0.3MnO3 epitaxial thin films on perovskite substrates with a range of lattice constants is studied in the frequency range 50–5000 cm. The complex dielectric functions of the bare La0.7Ca0.3MnO3 films are obtained by modeling the measured reflectivity spectra of the two-layer La0.7Ca0.3MnO3/substrate system with separately measured dielectric functions of the bare subst...

Considerable effort has been devoted in the literature to the synthesis of one-dimensional, periodic, binary and nonbinary sequences having small values for their out-of-phase autoeorrelation functions. This paper considers the synthesis of two-dimensional, periodic, binary and nonbinary sequences (arrays) which exhibit similar properties for their two-dimensional autocorrelation functions. The...

In this paper we report the results of electrical resistivity (1.5≤ T ≤ 300K) and point contact spectroscopy (PCS) measurements on single crystals of metallic sodium tungsten bronze with varying sodium content. We have shown that the electronphonon coupling function as measured through PCS can explain quantitatively the large temperature dependence of resistivity ρ seen in these materials over ...

An analytical approach, based on the unitary transformation method, has been developed to study the effect of quantum lattice fluctuations on the ground state of a model electron-phonon system. To study nonadiabatic case, the Green's function method is used to implement the perturbation treatment. The phase diagram and the density of states of fermions are obtained. We show that when electron-p...

Copper oxide doped TeO2–B2O3 glass system with empirical formula; $${[\left({{\text{B}}_{2}{\text{O}}_{3})}_{0.3}{\left({\text{TeO}}_{2}\right)}_{0.7}\right]}_{1-x}{(\text{CuO})}_{x}$$ was fabricated using the melt quenching method, where x = 0.0, 0.01, 0.015, 0.02, and 0.025 combined. The samples’ density molar volume were measured, followed by characterizations UV–Vis, Fourier transform infra...

In the last decade many variants of well-known notion an optical orthogonal code (OOC) have been studied. particular, it was allowed to variable weights and that codewords different weight may autocorrelation parameters so one should speak 'autocorrelation function' rather than parameter'. this paper we investigate OOCs with two 4 5, function values in $ \{1, 2\} $, crosscorrelation parameter o...

The optical gradient force distributions in focal plane of cosh-Gaussian beams with sine-azimuthal variation wavefront and half space phase modulation were investigated. Results show that optical gradient force distributions can be affected considerably by the phase retardation of half-space phase modulation, of a phase parameter that indicates the phase change frequency on an increasing azimut...