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We analytically study the propagation dynamics of two-dimensional accelerating beams in a generalized way and propose an optimized method to enhance their peak intensities. Our theoretical analysis is confirmed by experimental results.
We demonstrate nonparaxial Mathieu and Weber accelerating beams, generalizing the concept of previously found accelerating beams. Such beams bend into large angles along elliptical or parabolic trajectories but still retain nondiffracting and self-healing capabilities.
We propose and demonstrate a scheme to control the trajectories of single/multiple self-accelerating beams through analyzing the Fourier-space phase in both the paraxial and non-paraxial regimes. Our method is also applicable to vector self-accelerating beams.
We show that high-intensity Airy pulses propagating in Kerr-type nonlinear media can preserve their self-accelerating features under appropriate conditions. By engineering the input pulses, controllable spectral shifting and reshaping are achieved.
We demonstrate optical beam auto-focusing without the need of a focusing lens or nonlinearity. Radial Airy beams with inward and outward accelerations are used and an abrupt transition between Airy and Bessel behavior is observed.
We show how to enhance, reduce, and completely suppress the acceleration of Airy beams in graded-index media. By engineering the refractive-index gradient, active bending control of the Airy beams is realized, relevant to various environments.
Two-dimensional Airy beams controlled with self-focusing and self-defocusing nonlinearities exhibit unexpected behavior in free-space and scattering media, including stagnation and anomalous diffraction, and resistance to vibration and distortion, solely depending on the initial control.
The interpolator is one of the key functions modules in CNC system, which directly effects on machining accuracy, machining efficiency, and tool motion smoothness. In this paper, an interpolator with look-ahead control and feedrate filtering is proposed for non-uniform rational B-spline curves (NURBS) interpolation while considering the contour errors and feedrate fluctuations. In the proposed interpolator,...
In this paper, a hierarchical fuzzy logic traffic controller is constructed for a real intersection of fourteen vehicle lanes and two pedestrian crossings controlled by signals with seven light phases. The hierarchical fuzzy controller has seven inputs as queue lengths of the seven light phases, and one output as green time of the selected phase. In the hierarchical fuzzy controller, there are six...
The different car-following indexes in different traffic flow states are extracted first. And then a model is advanced to imitate the whole course from collecting information, making decisions to controlling the states of vehicles by using a new method named Information Fusion. One neuron is set, as a perception, in order to show the car-following behavior is discontinues. And different decision-constrain...
The driver controlling model of car-following based on preview follower theory is advanced by analyzing the relation of direction controlling and velocity controlling on the following car and regarding the whole car-following course as preview-follow to the velocity of the leading car for n times. The model could describe the car-following behaviors more truly due to the safety decision index is the...
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