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Blockchain Platforms as a Tool for Resolving Contradictions in the Labor Market and Improving the Interaction of the Applicant and Employer

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Blockchain Platforms as a Tool for Resolving Contradictions ...

2022 Conference of Russian Young Researchers in Electrical and Electronic Engineering, ElConRus 2022

作者： Levitskaya, Aleksandra N. Pokrovskaia, Nadezhda N. Rodionova, Elena A. St. Petersburg University of Management Technologies and Economics Department of Economics and Management of Socio-Economic Systems Saint Petersburg Russia Saint Petersburg Electrotechnical University Innovation Management Department Higher School of Mediacommunications Pr Peter the Great St.Petersburg Polytechnic University Economics and Management of Socio-Economic Systems Leti St. Petersburg University of Management Technologies and Economics St. Petersburg Russia School of Applied Mathematics and Computational Physics of the Physic-Mechanic Institute St. Petersburg University of Management Technologies and Economics Peter the Great St.Petersburg Polytechnic University Saint Petersburg Russia

ISBN: (纸本)9781665409933

The article provides a comparative analysis of blockchain platforms for creation, storage and trusted access to personalized documents for labor market participants. A project is discussed for creating reputation tokens as a crypto-currency of public trust, or as NFT, unique non-fungible assets of brand competency certificates. The paper investigates a number of problems arising in the interaction of employers and applicants, in particular, cybersecurity and reliability of certification, security of data and information flows, reconciliation of information about real work experience and obtained qualifications with employers' requests. The problems of the younger generation in the search for work and obtaining the desired positions are noted, i.e., the lack of data on competencies acquired, portfolio, previous experience. The blockchain platforms can help with solving tasks of HR service in the search and selection of candidates. The digitalization of social and economic life in Russia, in particular, labor market, is influenced with the cultural inertia and chasm of confidence between individuals, organizations and public administrations, the advantages of the use of blockchain technologies opens up in the field of recruiting and building a career path are shown on the basis of the enhancement of the mutual trust within the networks of distributed ledgers. © 2022 IEEE.

关键词： Blockchain

Extending the computational Reach of a Superconducting Qutrit Processor

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arXiv 2023年

作者： Goss, Noah Ferracin, Samuele Hashim, Akel Carignan-Dugas, Arnaud Kreikebaum, John Mark Naik, Ravi K. Santiago, David I. Siddiqi, Irfan Quantum Nanoelectronics Laboratory Department of Physics University of California at Berkeley BerkeleyCA94720 United States Applied Mathematics and Computational Research Division Lawrence Berkeley National Lab BerkeleyCA94720 United States Keysight Technologies Canada ON KanataK2K 2W5 Canada Materials Sciences Division Lawrence Berkeley National Lab BerkeleyCA94720 United States

Quantum computing with qudits is an emerging approach that exploits a larger, more-connected computational space, providing advantages for many applications, including quantum simulation and quantum error correction. Nonetheless, qudits are typically afflicted by more complex errors and suffer greater noise sensitivity which renders their scaling difficult. In this work, we introduce techniques to tailor and mitigate arbitrary Markovian noise in qudit circuits. We experimentally demonstrate these methods on a superconducting transmon qutrit processor, and benchmark their effectiveness for multipartite qutrit entanglement and random circuit sampling, obtaining up to 3x improvement in our results. To the best of our knowledge, this constitutes the first ever error mitigation experiment performed on qutrits. Our work shows that despite the intrinsic complexity of manipulating higher-dimensional quantum systems, noise tailoring and error mitigation can significantly extend the computational reach of today's qudit processors. Copyright © 2023, The Authors. All rights reserved.

关键词： Quantum chemistry

Designed spin-texture-lattice to control anisotropic magnon transport in antiferromagnets

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arXiv 2024年

作者： Meisenheimer, Peter Ramesh, Maya Husain, Sajid Harris, Isaac Park, Hyeon Woo Zhou, Shiyu Taghinejad, Hossein Zhang, Hongrui Martin, Lane W. Analytis, James Stevenson, Paul Íñiguez-González, Jorge Kim, Se Kwon Schlom, Darrell G. Caretta, Lucas Yao, Zhi Ramesh, Ramamoorthy Department of Materials Science and Engineering University of California BerkeleyCA United States Department of Materials Science and Engineering Cornell University IthacaNY United States Materials Science Division Lawrence Berkeley National Laboratory BerkeleyCA United States Department of Physics University of California BerkeleyCA United States Daejeon Korea Republic of Department of Physics Brown University ProvidenceRI United States School of Engineering Brown University ProvidenceRI United States Department of Physics Northeastern University BostonMA United States Department of Physics and Astronomy and Materials Science and NanoEngineering Rice Advanced Materials Institute Rice University HoustonTX United States Department of Chemistry Rice University HoustonTX United States Esch-sur-Alzette Luxembourg Department of Physics and Materials Science University of Luxembourg Belvaux Luxembourg Kavli Institue for Nanoscale Science Cornell University IthacaNY United States Leibniz-Institut für Kristallzüchtung Berlin Germany Applied Mathematics and Computational Research Division Lawrence Berkeley National Laboratory BerkeleyCA United States

Spin waves in magnetic materials are promising information carriers for future computing technologies due to their ultra-low energy dissipation and long coherence length. Antiferromagnets are strong candidate materials due, in part, to their stability to external fields and larger group velocities. Multiferroic aniferromagnets, such as BiFeO3 (BFO), have an additional degree of freedom stemming from magnetoelectric coupling, allowing for control of the magnetic structure, and thus spin waves, with electric field. Unfortunately, spin-wave propagation in BFO is not well understood due to the complexity of the magnetic structure. In this work, we explore long-range spin transport within an epitaxially engineered, electrically tunable, one-dimensional (1D) magnonic crystal. We discover a striking anisotropy in the spin transport parallel and perpendicular to the 1D crystal axis. Multiscale theory and simulation suggests that this preferential magnon conduction emerges from a combination of a population imbalance in its dispersion, as well as anisotropic structural scattering. This work provides a pathway to electrically-reconfigurable magnonic crystals in antiferromagnets. © 2024, CC BY.

关键词： Magnetic structure

Disk2Planet: A Robust and Automated Machine Learning Tool for Parameter Inference in Disk-Planet Systems

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arXiv 2024年

作者： Mao, Shunyuan Dong, Ruobing Yi, Kwang Moo Lu, Lu Wang, Sifan Perdikaris, Paris Department of Physics and Astronomy University of Victoria VictoriaBCV8P 5C2 Canada Kavli Institute for Astronomy and Astrophysics Peking University Beijing100871 China Department of Computer Science University of British Columbia VancouverBCV6T 1Z4 Canada Department of Statistics and Data Science Yale University New HavenCT06511 United States Graduate Group in Applied Mathematics and Computational Science University of Pennsylvania PhiladelphiaPA19104 United States Institute for Foundations of Data Science Yale University New HavenCT06520 United States Department of Mechanical Engineering and Applied Mechanics University of Pennsylvania PhiladelphiaPA19104 United States

We introduce Disk2Planet, a machine learning-based tool to infer key parameters in disk-planet systems from observed protoplanetary disk structures. Disk2Planet takes as input the disk structures in the form of two-dimensional density and velocity maps, and outputs disk and planet properties, that is, the Shakura-Sunyaev viscosity, the disk aspect ratio, the planet-star mass ratio, and the planet's radius and azimuth. We integrate the Covariance Matrix Adaptation Evolution Strategy (CMA-ES), an evolutionary algorithm tailored for complex optimization problems, and the Protoplanetary Disk Operator Network (PPDONet), a neural network designed to predict solutions of disk-planet interactions. Our tool is fully automated and can retrieve parameters in one system in three minutes on an Nvidia A100 graphics processing unit. We empirically demonstrate that our tool achieves percent-level or higher accuracy, and is able to handle missing data and unknown levels of noise. Copyright © 2024, The Authors. All rights reserved.

关键词： Open source software

Performance of Superconducting Resonators Suspended on SiN Membranes

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arXiv 2024年

作者： Chistolini, Trevor Lee, Kyunghoon Banerjee, Archan Alghadeer, Mohammed Jünger, Christian Altoé, M.P. Virginia Song, Chengyu Chen, Sudi Wang, Feng Santiago, David I. Siddiqi, Irfan Department of Physics University of California BerkeleyCA94720 United States Applied Mathematics and Computational Research Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Materials Science Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Molecular Foundry Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Kavli Energy NanoScience Institute The University of California Berkeley The Lawrence Berkeley National Laboratory BerkeleyCA94720 United States

Suspending devices on thin SiN membranes can limit their interaction with the bulk substrate and reduce parasitic capacitance to ground. While suspending devices on membranes is used in many fields including radiation detection using superconducting circuits, there has been less investigation into maximum membrane aspect ratios and achievable suspended device quality, metrics important to establish the applicable scope of the technique. Here, we investigate these metrics by fabricating superconducting coplanar waveguide resonators entirely atop thin (∼110 nm) SiN membranes, where the membrane’s shortest length to thickness yields an aspect ratio of approximately 7.4 × 103. We compare these membrane resonators to on-substrate resonators on the same chip, finding similar internal quality factors ∼105 at single photon levels. Furthermore, we confirm that these membranes do not adversely affect resonator thermalization and conduct further materials characterization. By achieving high quality superconducting circuit devices fully suspended on thin SiN membranes, our results help expand the technique’s scope to potential uses including incorporating higher aspect ratio membranes for device suspension and creating larger footprint, high impedance, and high quality devices. Copyright © 2024, The Authors. All rights reserved.

关键词： Aspect ratio

Absolute stimulated Brillouin side scattering in an inhomogeneous flowing plasma

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Physical Review E 2021年第6期104卷 065203-065203页

作者： C. Z. Xiao Y. G. Chen J. F. Myatt Q. Wang Y. Chen Z. J. Liu C. Y. Zheng X. T. He School of Physics and Electronics Hunan University Changsha 410082 China Department of Electrical and Computer Engineering 9211 116 St. NW University of Alberta Alberta T6G 1H9 Canada Collaborative Innovation Center of IFSA (CICIFSA) Shanghai Jiao Tong University Shanghai 200240 China Institute of Applied Physics and Computational Mathematics Beijing 100084 China HEDPS Center for Applied Physics and Technology Peking University Beijing 100871 China

Theory of absolute stimulated Brillouin side scattering in an inhomogeneous flowing plasma is presented and verified numerically. The linearized coupling equations are transformed into a Schrödinger equation in k space and solved as an eigenvalue problem. Analytic threshold, growth rate, and scattering geometry are obtained for the pump laser with arbitrary incidence angle. Numerical solutions of the coupling equations show good agreements between the theoretical and numerical absolute thresholds when ion-acoustic wave damping is not too large, and thus an old but famous threshold in [Phys. Fluids 17, 1211 (1974)] is corrected. It also indicates that the theoretical analysis is not accurate for strong dampings, since it will overestimate the absolute threshold. Possibility of finding such instability in the current experiments is also discussed.

关键词： Stimulated Brillouin & Raman scattering in plasmas Laser inertial confinement

Odd-even mass differences of well and rigidly deformed nuclei in the rare earth region: A test of a newly proposed fit of average pairing matrix elements

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arXiv 2024年

作者： Hao, T.V. Nhan Nguyen, N.N. Bao Tam, D. Quang Quentin, P. Bonneau, L. Koh, Meng-Hock Faculty of Physics University of Education Hue University 34 Le Loi Street Hue City Viet Nam Center for Theoretical and Computational Physics University of Education Hue University 34 Le Loi Street Hue City Viet Nam Faculty of Basic Sciences University of Medicine and Pharmacy Hue University 06 Ngo Quyen Street Hue City Viet Nam LP2I UMR 5797 Université de Bordeaux CNRS GradignanF-33170 France Department of Physics Faculty of Science Universiti Teknologi Malaysia Johor Johor Bahru81310 Malaysia UTM Centre for Industrial and Applied Mathematics Johor Johor Bahru81310 Malaysia

We discuss a test of a recently proposed approach to determine average pairing matrix elements within a given interval of single-particle states (sp) around the Fermi level λ as obtained in the so-called uniform gap method (UGM). It takes stock of the crucial role played by the averaged sp level density ρ˜(e). These matrix elements are deduced within the UGM approach, from microscopically calculated ρ˜(e) and gaps obtained from analytical formulae of a semi-classical nature. Two effects generally ignored in similar fits have been taken care of. They are: (a) the correction for a systematic bias in choosing to fit pairing gaps corresponding to equilibrium deformation solutions as discussed by Möller and Nix [Nucl. Phys. A 476, 1 (1992)] and (b) the correction for a systematic spurious enhancement of ρ˜(e) for protons in the vicinity of λ, because of the local Slater approximation used for the treatment of the Coulomb exchange terms in most calculations (see e.g. [Phys. Rev C 84, 014310 (2011)]). This approach has been deemed to be very efficient upon performing Hartree-Fock + BCS (with seniority force and self-consistent blocking when dealing with odd nuclei) calculations of a large sample of well and rigidly deformed even-even rare-earth nuclei. The reproduction of their experimental moments of inertia has been found to be at least of the same quality as what has been obtained in a direct fit of these data [Phys. Rev C 99, 064306 (2019)]. We extend here the test of our approach to the reproduction, in the same region, of three-point odd-even mass differences centered on odd-N or odd-Z nuclei. The agreement with the data is again roughly of the same quality as what has been obtained in a direct fit, as performed in [Phys. Rev C 99, 064306 (2019)]. © 2024, CC BY-NC-ND.

关键词： Hartree approximation

Importance of nonuniform Brillouin zone sampling for ab initio Bethe-Salpeter equation calculations of exciton binding energies in crystalline solids

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Physical Review B 2023年第23期108卷 235117-235117页

作者： Antonios M. Alvertis Aurélie Champagne Mauro Del Ben Felipe H. da Jornada Diana Y. Qiu Marina R. Filip Jeffrey B. Neaton KBR Inc NASA Ames Research Center Moffett Field California 94035 USA Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA Department of Physics University of California Berkeley Berkeley California 94720 USA Applied Mathematics & Computational Research Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA Department of Materials Science and Engineering Stanford University Stanford California 94305 USA Stanford Institute for Materials and Energy Sciences SLAC National Accelerator Laboratory Menlo Park California 94025 USA Department of Mechanical Engineering and Material Sciences Yale University New Haven Connecticut 06511 USA Department of Physics University of Oxford Oxford OX1 3PJ United Kingdom Kavli Energy NanoScience Institute at Berkeley Berkeley 94720 USA

Excitons are prevalent in semiconductors and insulators, and their binding energies are critical for optoelectronic applications. The state-of-the-art method for first-principles calculations of excitons in extended systems is the ab initio GW-Bethe-Salpeter equation (BSE) approach, which can require a fine sampling of reciprocal space to accurately resolve solid-state exciton properties. Here we show, for a range of semiconductors and insulators, that the commonly employed approach of uniformly sampling the Brillouin zone can lead to underconverged exciton binding energies, as impractical grid sizes are required to achieve adequate convergence. We further show that nonuniform sampling of the Brillouin zone, focused on the region of reciprocal space where the exciton wave function resides, enables efficient rapid numerical convergence of exciton binding energies at a given level of theory. We propose a well-defined convergence procedure, which can be carried out at relatively low computational cost and which in some cases leads to a correction of previous best theoretical estimates by almost a factor of 2, qualitatively changing the predicted exciton physics. These results call for the adoption of nonuniform sampling methods for ab initio GW-BSE calculations and for revisiting previously computed values for exciton binding energies of many systems.

关键词： Electronic structure Excitons First-principles calculations Optoelectronics Bethe-Salpeter equation

IMPROVED LOCAL SMOOTHING ESTIMATE FOR THE WAVE EQUATION IN HIGHER DIMENSIONS

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arXiv 2021年

作者： Gao, Chuanwei Liu, Bochen Miao, Changxing Xi, Yakun School of Mathematical Sciences Capital Normal University Beijing100048 China Department of Mathematics International Center for Mathematics Southern University of Science and Technology Shenzhen518055 China Institute for Applied Physics and Computational Mathematics Beijing China School of Mathematical Sciences Zhejiang University Hangzhou310027 China

In this paper, we establish the sharp k-broad estimate for a class of phase functions satisfying the homogeneous convex conditions. As an application, we obtain improved local smoothing estimates for the half-wave operator in dimensions n ≥ 3. As a byproduct, we also generalize the restriction estimates of Ou–Wang [22] to a broader class of phase *** Codes 42B37 Copyright © 2021, The Authors. All rights reserved.

关键词： Wave equations