5,776 research outputs found
Doping dependence of the upper critical field in La_{2-x}Sr_xCuO_4 from specific heat
The low-temperature specific heat of La_{2-x}Sr_xCuO_4 (LSCO) single crystals
in magnetic field H up to 12 T has been examined over a wide range of doping
(0.063=< p =<0.238). From this we have mapped the upper critical field H_{c2}
of LSCO across the entire superconducting diagram. It is found that the H_{c2}
shows a doping dependence similar to that of the critical temperature T_c. We
have discussed the implications of the result and proposed that there may be an
effective superconducting energy scale responsible for the H_{c2} behavior in
the underdoped region.Comment: 6 pages,3 figures,1 tabl
Predicting nonlinear dynamics of optical solitons in optical fiber via the SCPINN
The strongly-constrained physics-informed neural network (SCPINN) is proposed
by adding the information of compound derivative embedded into the
soft-constraint of physics-informed neural network(PINN). It is used to predict
nonlinear dynamics and the formation process of bright and dark picosecond
optical solitons, and femtosecond soliton molecule in the single-mode fiber,
and reveal the variation of physical quantities including the energy,
amplitude, spectrum and phase of pulses during the soliton transmission. The
adaptive weight is introduced to accelerate the convergence of loss function in
this new neural network. Compared with the PINN, the accuracy of SCPINN in
predicting soliton dynamics is improved by 5-11 times. Therefore, the SCPINN is
a forward-looking method to study the modeling and analysis of soliton dynamics
in the fiber
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