In this article, the problem of cross-domain fault diagnosis rotating machinery is considered. a practical setting approach, operating platform machine may have different setup and conditions compared to experimental that used collect training data. This can lead significant data variations, specifically domain shifts. Conventional data-driven approaches are known adapt poorly these shifts, resulting in drop accuracy when pretrained model applied actual situation. an unsupervised adaptation...

Neural network-based inverse lithography technology (NNILT) has been used to improve the computational efficiency of large-scale mask optimization for advanced photolithography. NNILT is now mostly based on labels, and its performance affected by quality labels. It difficult achieve high extrapolation ability without using Here, we propose a label-free (LF-NNILT), which implemented completely labels greatly improves printability target layouts manufacturability synthesized masks compared...

Approximate analytic solutions of the leaky modes in two-dimensional slab waveguides are derived through an asymptotic analysis. General with three layers possibly different refractive indexes studied for both transverse electric (TE) and magnetic (TM) cases. The results useful eigenmode expansion method, where appear if a perfectly matched layer (PML) is used to terminate directions optical waveguides.

High power cylindrical Ni-MH battery cells have a heavy heat load because of their high discharge rate and large equivalent internal resistance. This load, together with an imbalanced flow in parallel liquid cooling systems, can lead to variances the temperature each cell entire pack, thereby reducing life cycle pack. In this paper, parallel-series combined system for 288V pack was designed, several parameters that influence balance by transfer fluid dynamics were calculated. Then,...

Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation J. Zhu, G. Y. Fu, Z. W. Ma; Nonlinear dynamics of toroidal Alfvén eigenmodes driven by energetic particles. Phys. Plasmas 1 July 2013; 20 (7): 072508. https://doi.org/10.1063/1.4816950 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search...

The perfectly matched layer (PML) is a widely used technique for truncating unbounded domains in numerical simulations of wave propagation problems. In this paper, the PML with standard one-way model to solve benchmark problem underwater acoustics modeling. Accurate solutions are obtained thickness only quarter wavelength. effect analyzed perturbation analysis Pekeris waveguide. keyword: Perfectly layer, acoustic waveguides, equations.

For numerical modeling of optical wave-guiding structures, perfectly matched layers (PMLs) are widely used to terminate the transverse variables waveguide. The PML modes eigenmodes a waveguide terminated by PMLs, and they have found important applications in mode matching method, coupled theory, so on. In this paper, we consider for two-dimensional slab waveguides. It is shown that consist perturbed propagating modes, leaky two infinite sequences Berenger modes. High-order asymptotic...

A numerical method is developed for solving the two-dimensional Helmholtz equation in a two layer region bounded by flat top, bottom and curved interface. local orthogonal transform used to flatten interface of waveguide. The one-way reformulation based on Dirichlet-to-Neumann (DtN) map then reduce boundary value problem an initial problem. Numerical implementation resulting operator Riccati uses large range step discretizing variable truncated eigenfunction expansion approximating...

For numerical simulations of optical waveguides, perfectly matched layers (PMLs) are widely used to truncate the unbounded transverse directions. However, a PML induces some undesired side effects propagating modes in waveguide. In general, propagation constant becomes complex, so that mode may grow or decay exponentially along waveguide axis. Through perturbation analysis, we obtain approximate formulas for constants PML-terminated planar waveguides.

For a nonhomogeneous waveguide, whose refractive index is not constant, the problem very complicated since nonlinear eigenvalue problems are unable to reduce algebraic equations yet. When varied, dispersion relation cannot be derived by using analytic expressions of solutions in each layer. In this paper, solved differential transfer matrix method, which introduced deduce relations leaky modes for TE and TM cases, respectively. Moreover, waveguide gradually can approximated some simpler...

The current status of the optical fiber vibration sensing applied in West-East Gas Pipeline project is introduced. A fast filter and a machine learning algorithm used to distinguish causes vibration.

In this paper, two optical image skeletonization algorithms are introduced. both algorithms, the matching between an input and a set of precalculated parallel check patterns is performed. Based on results, multistage symbolic substitution operations incorporated. For implementation, hologram-based content-addressable memory technique employed. The corresponding architecture as well character examples presented.

What we believe to be a new one-dimensional full-vectorial mode solver for circular waveguides in step-index optical fibers is introduced based on the multidomain Chebyshev pseudospectral method and perfectly matched layer. The formulations are derived with two transverse components radial axis cylindrical coordinate system. electromagnetic fields expanded inside each homogeneous layer by basis functions, then rigorously at discontinuities interface conditions. numerical analysis guided...

In this paper, based on a new treatment for local base transformation, modified operator marching method is provided to accurately compute optical propagation in the inhomogeneous waveguide terminated by perfectly matched layer. Compared with adjoint (AOM), high-precision results of can be obtained numerical simulations, which demonstrate that much better than AOM. This technique helpful optimize designs waveguides and integrated optics devices.

Numerical solutions of the Helmholtz equation and one-way are compared in weak range dependence limit, where overall distance is increased while weakened. It observed that difference between these two equations persists this limit. The involves a square root operator it can be further approximated by various models used underwater acoustics. An marching method based on Dirichlet-to-Neumann map local orthogonal transform to solve equation.

A unified high-accuracy mode solver is proposed to compute the modes of planar optical waveguides. The advantage this composed three aspects. first high accuracy mapped barycentric rational Chebyshev differentiation matrix (MBRCDM) for approximating differential operator. second efficiency multidirectional Newton iteration root finding on complex plane. third outstanding performance perfectly matched layer (PML) as an absorbing boundary condition (BC). Specifically, MBRCDM method accurate...

An optical carry-free technique is introduced for conversion of a modified signed digit (MSD) into two's complement binary number. Using combination polarizing beam splitters and retardation waveplates, the proposed device performs this on fly. The availability converter will lead to large speed increase various parallel MSD arithmetic processors.