3,822 research outputs found
Interlayer Coupling of Co/NM/FM(NiFe and Co) Nano-Sandwich Films
AbstractCu/Co, Cu/NiFe, Ta/NiFe bilayers and Co/Cu/Co, Co/Cu/NiFe, Co/Ta/NiFe sandwich films were deposited by a magnetron sputtering method. Magnetic properties were evaluated by VSM and spin valve magnet oresistance was investigated by a four-probe method to study the interlayer coupling of the two magnetic layers. It has been found that the interlayer coupling depended not only on the layer thickness of the nonmagnetic spacer but also on the nature of the spacer. The interlayer coupling was reduced as the spacer layer thickness increased. The result was consistent with those from observations of the magnetic domain for the trilayers by means of Lorentz Electron Microscope. The trilayers with Cu spacer layer have shown a stronger coupling than those with Ta spacer layer
Virtual fractional flow reserve and virtual coronary stent guided percutaneous coronary intervention
Meta-DSP: A Meta-Learning Approach for Data-Driven Nonlinear Compensation in High-Speed Optical Fiber Systems
Non-linear effects in long-haul, high-speed optical fiber systems
significantly hinder channel capacity. While the Digital Backward Propagation
algorithm (DBP) with adaptive filter (ADF) can mitigate these effects, it
suffers from an overwhelming computational complexity. Recent solutions have
incorporated deep neural networks in a data-driven strategy to alleviate this
complexity in the DBP model. However, these models are often limited to a
specific symbol rate and channel number, necessitating retraining for different
settings, their performance declines significantly under high-speed and
high-power conditions. We introduce Meta-DSP, a novel data-driven nonlinear
compensation model based on meta-learning that processes multi-modal data
across diverse transmission rates, power levels, and channel numbers. This not
only enhances signal quality but also substantially reduces the complexity of
the nonlinear processing algorithm. Our model delivers a 0.7 dB increase in the
Q-factor over Electronic Dispersion Compensation (EDC), and compared to DBP, it
curtails computational complexity by a factor of ten while retaining comparable
performance. From the perspective of the entire signal processing system, the
core idea of Meta-DSP can be employed in any segment of the overall
communication system to enhance the model's scalability and generalization
performance. Our research substantiates Meta-DSP's proficiency in addressing
the critical parameters defining optical communication networks
The linear and nonlinear Jaynes-Cummings model for the multiphoton transition
With the Jaynes-Cummings model, we have studied the atom and light field
quantum entanglement of multiphoton transition, and researched the effect of
initial state superposition coefficient , the transition photon number
, the quantum discord and the nonlinear coefficient on the
quantum entanglement degrees. We have given the quantum entanglement degrees
curves with time evolution, and obtained some results, which should have been
used in quantum computing and quantum information.Comment: arXiv admin note: text overlap with arXiv:1404.0821, arXiv:1205.0979
by other author
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