2,434 research outputs found
A Method for Pose and Type Verification of Resistor
AbstractThis paper proposes a method for verifying the pose and the type of different resistors mounted on a PCB. First, the pose of the resistor on the PCB is determined and missing resistors are detected by shape_based template matching. Then, the type of the resistor is extracted and compared to the known reference type by edge_based template matching. Finally, six types of resistors have been verified on 120 resistor images. Experiments have shown that the shape_based template can be used to determine the pose of the resistor even if it appears rotated and scaled. The proposed method can achieve the accuracy of 100% and average recognition time of 0.15s
The Bottom-Up EFT: Complete UV Resonances of the SMEFT Operators
The standard model effective field theory (SMEFT) provides systematic
parameterization of all possible new physics above the electroweak scale.
According to the amplitude-operator correspondence, an effective operator can
be decomposed into a linear combination of several j-basis operators, which
correspond to local amplitudes carrying certain spin and gauge quantum numbers
in a particular scattering channel. Based on the Poincare and gauge symmetries
of scattering amplitude, we construct the j-basis using the Casimir method for
both the Lorentz and gauge sectors. The quantum numbers of the j-basis
operators fix the quantum numbers of any intermediate state in the
corresponding amplitudes, such as a UV resonance. This can be re-interpreted as
the j-basis/UV correspondence, thus obtaining the j-bases in all partitions of
fields for an operator amounts to finding all of its UV origins at tree level,
constituting the central part of the bottom-up EFT framework. Applying the
j-basis analysis to SMEFT, we obtain a complete list of possible tree-level UV
origins of the effective operators at the dimension 5, 6, 7, and all the
bosonic operators at the dimension 8.Comment: 123 pages, 19 figures, 34 table
Bis(4-dimethylÂamino-1-ethylÂpyridinium) bisÂ(1,2-dicyanoÂethene-1,2-dithiolÂato-κ2 S,S′)nickelate(II)
The asymmetric unit of the title complex, (C9H15N2)2[Ni(C4N2S2)2], comprises one 4-dimethylÂamino-1-ethylÂpyriÂdinÂium cation and one half of a [Ni(mnt)2]2− (mnt2− = maleoÂnitrileÂdithiolÂate) anion; the complete anion is generated by the application of a centre of inversion. The NiII ion is coordinated by four S atoms of two mnt2− ligands and exhibits a square-planar coordination geometry
Topological magnons in one-dimensional ferromagnetic Su-Schrieffer-Heeger model with anisotropic interaction
Topological magnons in a one-dimensional (1D) ferromagnetic (FM)
Su-Schrieffer-Heeger (SSH) model with anisotropic exchange interactions are
investigated. Apart from the inter-cellular isotropic Heisenberg interaction,
the intercellular anisotropic exchange interactions, i.e. Dzyaloshinskii-Moriya
interaction (DMI) and pseudo-dipolar interaction (PDI), also can induce the
emergence of the non-trivial phase with two degenerate in-gap edge states
separately localized at the two ends of the 1D chain, while the intracellular
interactions instead unfavors the topological phase. The interplay among them
has synergistic effects on the topological phase transition, very different
from that in the two-dimensional (2D) ferromagnet. These results demonstrate
that the 1D magnons possess rich topological phase diagrams distinctly
different from the electronic version of the SSH model and even the 2D magnons.
Due to the lower dimensional structural characteristics of this 1D topological
magnonic system, the magnonic crystals can be constructed from bottom to top,
which has important potential applications in the design of novel magnonic
devices.Comment: 22 pages, 11 figure
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