1,893 research outputs found
A THEORETICAL MODEL OF SPORTS SINGLE CYCLE COMPETITION RANKING BASED ON SPORTSMANSHIP PROMOTION
EXPLORATION OF IDEOLOGICAL AND POLITICAL TEACHING REFORM IN COLLEGE PE CURRICULUM FROM THE PERSPECTIVE OF EDUCATIONAL PSYCHOLOGY
EXPLORATION OF IDEOLOGICAL AND POLITICAL TEACHING REFORM IN COLLEGE PE CURRICULUM FROM THE PERSPECTIVE OF EDUCATIONAL PSYCHOLOGY
Sequential fault detection for sealed deep groove ball bearings of in-wheel motor in variable operating conditions
Sealed deep groove ball bearings (SDGBBs) are employed to perform the relevant duties of in-wheel motor. However, the unique construction and complex operating environment of in-wheel motor may aggravate the occurrence of SDGBB faults. Therefore, this study presents a new intelligent diagnosis method for detecting SDGBB faults of in-wheel motor. The method is constructed on the basis of optimal composition of symptom parameters (SPOC) and support vector machines (SVMs). SPOC, as the objects of a follow-on process, is proposed to obtain from symptom parameters (SPs) of multi-direction. Moreover, the optimal hyper-plane of two states is automatically obtained using soft margin SVM and SPOC, and then using multi-SVMs, the system of intelligent diagnosis is built to detect many faults and identify fault types. The experiment results confirmed that the proposed method can excellently perform fault detection and fault-type identification for the SDGBB of in-wheel motor in variable operating conditions
Steady Bell state generation via magnon-photon coupling
We show that parity-time () symmetry can be spontaneously
broken in the recently reported energy level attraction of magnons and cavity
photons. In the -broken phase, magnon and photon form a
high-fidelity Bell state with maximum entanglement. This entanglement is steady
and robust against the perturbation of environment, in contrast to the general
wisdom that expects instability of the hybridized state when the symmetry is
broken. This anomaly is further understood by the compete of non-Hermitian
evolution and particle number conservation of the hybridized system. As a
comparison, neither -symmetry broken nor steady magnon-photon
entanglement is observed inside the normal level repulsion case. Our results
may open a novel window to utilize magnon-photon entanglement as a resource for
quantum technologies.Comment: 5 pages, 4 figure
Generation of nonparaxial self-accelerating beams using pendant droplets
We propose and demonstrate the effectual generation and control of
nonparaxial self-accelerating beams by using UV-resin pendant droplets. We show
that the geometrical shape of the hanging droplets formed as a result of the
interplay between surface tension and gravity offers a natural curvature
enabling the generation of nonparaxial self-accelerating beams. By simply
adjusting the tilt angle of the surface where the droplets reside, a passing
light beam is set to propagate along different curved trajectories, bending
into large angles with non-diffracting features superior to a conventional Airy
beam. Such self-accelerating beams are directly traced experimentally through
the scattered light in yeast-cell suspensions, along with extensive ray tracing
and numerical simulations. Furthermore, by modifying the shape of uncured
pendant resin droplets in real time, we showcase the dynamical trajectory
control of the self-accelerating beams. Our scheme and experimental method may
be adopted for droplet-based shaping of other waves such as microfluidic jets
and surface acoustic waves.Comment: 8 pages, 8 figures, research articl
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