scholarly journals High-accuracy Ising machine using Kerr-nonlinear parametric oscillators with local four-body interactions

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Taro Kanao ◽  
Hayato Goto
Keyword(s):  
Large Scale ◽  
High Accuracy ◽  
Two Dimensional ◽  
Promising Candidate ◽  
Parametric Oscillators ◽  
Adiabatic Quantum Computation ◽  
Asymmetric Networks ◽  
Simulation Results ◽  
The Asymmetry ◽  
General Networks

AbstractA two-dimensional array of Kerr-nonlinear parametric oscillators (KPOs) with local four-body interactions is a promising candidate for realizing an Ising machine with all-to-all spin couplings, based on adiabatic quantum computation in the Lechner–Hauke–Zoller (LHZ) scheme. However, its performance has been evaluated only for a symmetric network of three KPOs, and thus it has been unclear whether such an Ising machine works in general cases with asymmetric networks. By numerically simulating an asymmetric network of more KPOs in the LHZ scheme, we find that the asymmetry in the four-body interactions causes inhomogeneity in photon numbers and hence degrades the performance. We then propose a method for reducing the inhomogeneity, where the discrepancies of the photon numbers are corrected by tuning the detunings of KPOs depending on their positions, without monitoring their states during adiabatic time evolution. Our simulation results show that the performance can be dramatically improved by this method. The proposed method, which is based on the understanding of the asymmetry, is expected to be useful for general networks of KPOs in the LHZ scheme and thus for their large-scale implementation.

scholarly journals Unified particle method with application to the 2013 Huangping landslides and tsunamis event of China

2018 ◽  
Vol 53 ◽  
pp. 03018
Author(s):  
Quan Jiang ◽  
Xi-liang Chen ◽  
Xiang-dong Qiu
Keyword(s):  
Large Scale ◽  
Particle Method ◽  
High Accuracy ◽  
Governing Equations ◽  
Wave Generator ◽  
Lagrangian Form ◽  
Verification Test ◽  
Simulation Results ◽  
Impulse Waves ◽  
The Relationship

In this study, a unified particle method is presented to simulate the fluid-solid coupling problem in broad range of scales such as landslide and tsunamis. First, a general overview of the method is addressed, and the governing equations are solved in a Lagrangian form. Second, the method is used to simulate the Scott Russell wave generator experiment containing simple fluid-solid coupling, and the relationship between the simulation results and the experimental results is analyzed to verify the validity of the model. Then, the method is applied to the 2D processes simulation of Huangping landslide generated impulse waves in large scale. The results show that: in the verification test, the wave amplitude error between the simulation and the experimental data is almost 0. In the application case of Huangping landslides and tsunamis, the maximum impulse wave height obtained by the simulation is close to the local observations, which indicates that the method has high accuracy and credibility.

The Application of Subsection Simpson Integration on Artillery Firing Efficiency Simulation Modeling

2011 ◽  
Vol 130-134 ◽  
pp. 2655-2660
Author(s):  
Zhi Qiang Zhao ◽  
Bo Chuan Jiang
Keyword(s):  
Simulation Modeling ◽  
Large Scale ◽  
Evaluation Model ◽  
Computation Method ◽  
Two Dimensional ◽  
Statistical Experiment ◽  
Large Scale Simulation ◽  
Experiment Method ◽  
Simulation Results ◽  
Firing Efficiency

The evaluation model of artillery firing efficiency is widely applied to firepower command&control and large-scale simulation, itis very important for improving precision and speed of calculation to enhance capability of firepower command&control and large-scale simulation. Two-dimensional subsection Simpson integration was introduced to evaluation the model, the analysis of two-dimensional subsection Simpson integration in theory showed that convergence speed of two-dimensional subsection Simpson integration enhance to O(h4). The simulation results indicate that, speed of two-dimensional subsection Simpson integration is higher 20 times than statistics experiment method, precision of two-dimensional subsection Simpson integration is a little higher than the typical numerical integration such as midpoint formula integration and statistical experiment method, but it can promotes precision by 10% than approximate computation method.

Coordination Fault Diagnosis Based on RBF

2013 ◽  
Vol 329 ◽  
pp. 278-282
Author(s):  
Rui Hua Xu ◽  
Zheng Zhou Wang ◽  
Ya Dong Yan ◽  
Cai Wen Ma
Keyword(s):  
Fault Diagnosis ◽  
Large Scale ◽  
High Accuracy ◽  
Case Based Reasoning ◽  
Rule Based ◽  
Diagnosis System ◽  
Fault Diagnosis System ◽  
Simulation Results ◽  
Self Learning ◽  
Case Based

In large-scale complex system, The establishment of a fast, accurate fault diagnosis system is more difficult because there exist many uncertain elements between the fault cause and the fault sign .A fault diagnosis system is established based on RBF cloud neural network ,the RBR (rule-based reasoning) and the CBR (case-based reasoning).The fault diagnosis system not only has the advantages of self-learning, high accuracy, randomness, fuzziness, etc ,and has the advantages of independently of mathematical model ,rich knowledge representation, mighty problem solving ability, etc. Theoretical analysis and simulation results show that the system is feasible and effective for fast and accurate fault positioning of complex systems.

scholarly journals Beta-PdBi2 Monolayer: Two-Dimensional Topological Metal with Superior Catalytic Activity for Carbon Dioxide Electroreduction to Formic Acid

2020 ◽  
Author(s):  
Xiaorong Zhu ◽  
Yu Wang ◽  
Yu Jing ◽  
Thomas Heine ◽  
Yafei Li
Keyword(s):  
Catalytic Activity ◽  
Large Scale ◽  
Three Dimensional ◽  
Layered Materials ◽  
Spin Orbit Coupling ◽  
Two Dimensional ◽  
Promising Candidate ◽  
Onset Potential ◽  
Promising Solution ◽  
2D Crystals

The lack of efficient electrocatalysts has been a main obstacle for the large-scale commercialization of CO<sub>2</sub> electroreduction. In this work, we demonstrate that two-dimensional (2D) beta-PdBi<sub>2</sub> mono-layer is a promising solution for this issue. beta-PdBi<sub>2</sub> monolayer is a stable 2D crystal and the three-dimensional (3D) bulk interlayer energy is similar as for other layered materials that can be exfoliated into 2D crystals. Interestingly, beta-PdBi<sub>2</sub> monolayer has rather intri-guing electronic properties: while being metallic, it also has a non-trivial topological point. Remarkably, the extra electronic states at the Fermi level induced by the intrinsic spinorbit coupling (SOC) effect significantly enhance the adsorption of OCHO* intermediate on beta-PdBi<sub>2</sub> monolayer, resulting in a rather small onset potential of -0.26 V vs. RHE for CO<sub>2</sub> electroreduction to HCOOH. These results not only suggest a promising candidate for CO<sub>2</sub> electrolysis but also deepen our understanding of the factors dominating the catalytic activity of 2D materials. <br>

scholarly journals Beta-PdBi2 Monolayer: Two-Dimensional Topological Metal with Superior Catalytic Activity for Carbon Dioxide Electroreduction to Formic Acid

2020 ◽  
Author(s):  
Xiaorong Zhu ◽  
Yu Wang ◽  
Yu Jing ◽  
Thomas Heine ◽  
Yafei Li
Keyword(s):  
Catalytic Activity ◽  
Large Scale ◽  
Three Dimensional ◽  
Layered Materials ◽  
Spin Orbit Coupling ◽  
Two Dimensional ◽  
Promising Candidate ◽  
Onset Potential ◽  
Promising Solution ◽  
2D Crystals

The lack of efficient electrocatalysts has been a main obstacle for the large-scale commercialization of CO<sub>2</sub> electroreduction. In this work, we demonstrate that two-dimensional (2D) beta-PdBi<sub>2</sub> mono-layer is a promising solution for this issue. beta-PdBi<sub>2</sub> monolayer is a stable 2D crystal and the three-dimensional (3D) bulk interlayer energy is similar as for other layered materials that can be exfoliated into 2D crystals. Interestingly, beta-PdBi<sub>2</sub> monolayer has rather intri-guing electronic properties: while being metallic, it also has a non-trivial topological point. Remarkably, the extra electronic states at the Fermi level induced by the intrinsic spinorbit coupling (SOC) effect significantly enhance the adsorption of OCHO* intermediate on beta-PdBi<sub>2</sub> monolayer, resulting in a rather small onset potential of -0.26 V vs. RHE for CO<sub>2</sub> electroreduction to HCOOH. These results not only suggest a promising candidate for CO<sub>2</sub> electrolysis but also deepen our understanding of the factors dominating the catalytic activity of 2D materials. <br>

Solution‐Processed Large‐Scale Concentric‐Ring Laser on Two‐Dimensional Ruddlesden–Popper Perovskites Thin Films

2021 ◽  
pp. 2100193
Author(s):  
Peng Liu ◽  
Bingqian Zhang ◽  
Qing Liao ◽  
Guifen Tian ◽  
Chunling Gu ◽  
...  
Keyword(s):  
Thin Films ◽  
Ring Laser ◽  
Large Scale ◽  
Two Dimensional ◽  
Concentric Ring ◽  
Solution Processed

scholarly journals Polymorphic gallium for active resonance tuning in photonic nanostructures: from bulk gallium to two-dimensional (2D) gallenene

Nanophotonics ◽  
2020 ◽  
Vol 9 (14) ◽  
pp. 4233-4252
Author(s):  
Yael Gutiérrez ◽  
Pablo García-Fernández ◽  
Javier Junquera ◽  
April S. Brown ◽  
Fernando Moreno ◽  
...  
Keyword(s):  
Optical Properties ◽  
Room Temperature ◽  
Phase Change Materials ◽  
Two Dimensional ◽  
Active Materials ◽  
Promising Candidate ◽  
Plasmonic Structures ◽  
Resonance Tuning ◽  
The Many ◽  
Optical Behavior

AbstractReconfigurable plasmonics is driving an extensive quest for active materials that can support a controllable modulation of their optical properties for dynamically tunable plasmonic structures. Here, polymorphic gallium (Ga) is demonstrated to be a very promising candidate for adaptive plasmonics and reconfigurable photonics applications. The Ga sp-metal is widely known as a liquid metal at room temperature. In addition to the many other compelling attributes of nanostructured Ga, including minimal oxidation and biocompatibility, its six phases have varying degrees of metallic character, providing a wide gamut of electrical conductivity and optical behavior tunability. Here, the dielectric function of the several Ga phases is introduced and correlated with their respective electronic structures. The key conditions for optimal optical modulation and switching for each Ga phase are evaluated. Additionally, we provide a comparison of Ga with other more common phase-change materials, showing better performance of Ga at optical frequencies. Furthermore, we first report, to the best of our knowledge, the optical properties of liquid Ga in the terahertz (THz) range showing its broad plasmonic tunability from ultraviolet to visible-infrared and down to the THz regime. Finally, we provide both computational and experimental evidence of extension of Ga polymorphism to bidimensional two-dimensional (2D) gallenene, paving the way to new bidimensional reconfigurable plasmonic platforms.

scholarly journals Galaxy spin direction distribution in HST and SDSS show similar large-scale asymmetry

2020 ◽  
Vol 37 ◽  
Author(s):  
Lior Shamir
Keyword(s):  
Large Scale ◽  
Spiral Galaxies ◽  
Hubble Space Telescope ◽  
Gravitational Interaction ◽  
Large Data ◽  
Sloan Digital Sky Survey ◽  
Data Sets ◽  
Dipole Axis ◽  
Data Set ◽  
The Asymmetry

Abstract Several recent observations using large data sets of galaxies showed non-random distribution of the spin directions of spiral galaxies, even when the galaxies are too far from each other to have gravitational interaction. Here, a data set of $\sim8.7\cdot10^3$ spiral galaxies imaged by Hubble Space Telescope (HST) is used to test and profile a possible asymmetry between galaxy spin directions. The asymmetry between galaxies with opposite spin directions is compared to the asymmetry of galaxies from the Sloan Digital Sky Survey. The two data sets contain different galaxies at different redshift ranges, and each data set was annotated using a different annotation method. The results show that both data sets show a similar asymmetry in the COSMOS field, which is covered by both telescopes. Fitting the asymmetry of the galaxies to cosine dependence shows a dipole axis with probabilities of $\sim2.8\sigma$ and $\sim7.38\sigma$ in HST and SDSS, respectively. The most likely dipole axis identified in the HST galaxies is at $(\alpha=78^{\rm o},\delta=47^{\rm o})$ and is well within the $1\sigma$ error range compared to the location of the most likely dipole axis in the SDSS galaxies with $z>0.15$ , identified at $(\alpha=71^{\rm o},\delta=61^{\rm o})$ .

Large-scale visualization of dispersion of liquid-exfoliated two-dimensional nanosheets

2021 ◽  
Author(s):  
Xingyu Cui ◽  
Wen ying Shi ◽  
Chao Lu
Keyword(s):  
Aqueous Solution ◽  
Large Scale ◽  
Fluorescence Microscope ◽  
Visualization Method ◽  
Two Dimensional ◽  
Non Invasive

An ultrafast, non-invasive and large-scale visualization method has been developed to evaluate the dispersion of two-dimensional nanosheets in aqueous solution with fluorescence microscope by formation of excimers from improvement of...

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