Article
Physics, Multidisciplinary
A. Erpenbeck, E. Gull, G. Cohen
Summary: We propose a numerically exact method for nonequilibrium quantum impurity models, which directly formulates in the steady state, eliminating the need to traverse the transient dynamics and reducing computational costs. The method is benchmarked on quantum dots in the noninteracting and Kondo regime, as well as correlated materials driven away from equilibrium. Qualitative differences are observed in the response to bias voltage between correlated materials and bias-driven quantum dots.
PHYSICAL REVIEW LETTERS
(2023)
Article
Thermodynamics
Catarina G. dos Santos, Julia P. Ruivo, Leticia B. Gasparini, Maria Thereza de M. G. Rosa, Darci Odloak, Miriam Tvrzska de Gouvea
Summary: This paper proposes a rigorous model for predicting the operation of an air cooled chiller in a large office building. It also presents simple correlations for predicting heat exchange coefficients and pressure drops. The rigorous model is shown to accurately predict the operation of the chiller and optimize energy consumption. The importance of considering evaporator pressure drop is emphasized.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Mechanics
Xiaoyan Yang, Ye Li
Summary: Based on the recent study by Yang et al., this research investigates two primary waves traveling with an arbitrary included angle by solving the water-wave equations as a nonlinear boundary-value problem. The homotopy analysis method is used to solve the problem of small denominators and singularity. It is found that as the acute angle between the two primary wave components becomes smaller, the wave energy slowly shifts from the primary wave components to the high-order wave components, and the increase in wave amplitude strengthens this energy transfer.
Article
Physics, Multidisciplinary
S. Toepfer, Y. Narita, D. Schmid
Summary: In the steady-state picture, the magnetic field can be described by a curl-free potential field in the magnetosheath region. The sheath field is determined by the upstream field and the transformation matrix, and it can be used to reconstruct the upstream field.
FRONTIERS IN PHYSICS
(2022)
Article
Computer Science, Artificial Intelligence
Jie Zhong, Bowen Li, Yang Liu, Jianquan Lu, Weihua Gui
Summary: This article examines the steady-state design of large-dimensional Boolean networks via model reduction and pinning control, reducing computational complexity significantly. The proposed method is demonstrated on two specific networks, showing a substantial reduction in redundant states.
IEEE TRANSACTIONS ON NEURAL NETWORKS AND LEARNING SYSTEMS
(2021)
Article
Thermodynamics
Lixun Chi, Huai Su, Enrico Zio, Meysam Qadrdan, Jing Zhou, Li Zhang, Lin Fan, Zhaoming Yang, Fei Xie, Lili Zuo, Jinjun Zhang
Summary: This paper proposes a systematic framework to analyze the reliability of energy supply in Integrated Energy Systems (IES) by considering the dynamics of IES and the inter-relationships among uncertainties. By establishing a quasi-steady-state model and a model that combines the statistical structure with the machine learning method, the reliability of IES is evaluated and validated through case studies.
Article
Automation & Control Systems
Zhijie Liu, Ke-Jun Li, Jinyu Wang, Wentao Liu, Zahid Javid, Zhuo-di Wang
Summary: This study introduces a general MMC model which comprehensively considers various optimization methods to improve the multiaspect performance of the MMC, with a calculation error less than 1%. The proposed model shows better performance compared to traditional models in affecting both DC and fundamental components in modulation signals.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2021)
Article
Mathematics, Interdisciplinary Applications
Mengxin Chen, Ranchao Wu
Summary: This study introduces prey-taxis, which describes the directed movement of predator species, into the Previte-Hoffman model and investigates steady-state bifurcation with no-flux boundary conditions and prey-taxis. The stability analysis of the positive equilibrium, the existence of Hopf bifurcation, and steady-state bifurcation are presented. The Crandall-Rabinowitz local bifurcation theory is employed to determine the existence and stability of nonconstant steady-state bifurcation. Results show that only repulsive prey-taxis can induce steady-state bifurcation in the Previte-Hoffman model, leading to the occurrence of spatiotemporal patterns demonstrated through numerical simulations.
INTERNATIONAL JOURNAL OF BIFURCATION AND CHAOS
(2023)
Article
Materials Science, Multidisciplinary
Takuji Oda
Summary: This study proposes an effective method to calculate the steady-state tritium inventory in plasma-facing tungsten, using rate theory and equilibrium theory to model the surface and diffusion processes of hydrogen isotopes and trap effects. The results show that tritium retention in the deep region becomes the main source of tritium inventory at a steady state in plasma-facing tungsten. The proposed method has important implications for exploring tritium inventory and the effects of hydrogen isotopes on mechanical integrity.
JOURNAL OF NUCLEAR MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Luca Corradini, Dragan Maksimovic
Summary: This article demonstrates that lossless switched-mode power converters may not have a unique steady-state solution, especially odd-order converters. Indeterminate converters can be sensitive to nonideal effects and exhibit undesired voltages or circulating currents with both dc and ac components. The developed mathematical framework and theory provide a systematic assessment of steady-state indeterminacy and explain the behavior of various converter topologies, such as multiphase and multilevel dc-dc converters.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Chemistry, Physical
Loic Joubert-Doriol, Kenneth A. Jung, Artur F. Izmaylov, Paul Brumer
Summary: This study provides a completely general approach to defining components of a quantum network in the nonequilibrium steady state (NESS) and obtaining rates of processes between these components. The methodology is applied to model cases, including two versions of the V-level system and the spin-boson model, to investigate the roles of environment and internal system properties in determining the rates.
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
(2023)
Article
Energy & Fuels
Mingtan Zhu, Bo Li, Guo Liu
Summary: Due to the exhaustion of coal resources and resource integration, a large number of coal mines in China have been closed or are close to closing, resulting in the discharge of acid mine water from abandoned mines, which poses pollution and safety risks to the water environment. Therefore, conducting environmental risk assessments of abandoned mine groundwater is essential. This study analyzes the mine water inflow, groundwater water chemistry, and water environment pollution situation of the abandoned Chuanbei mine in northern Sichuan province, China, identifies the drivers and sources of pollution, and discovers high-risk areas for groundwater pollution. The results can provide theoretical guidance for the comprehensive remediation of mine environments in this area.
Article
Materials Science, Multidisciplinary
N. A. Fleck, J. R. Willis
Summary: The study utilizes the Wiener-Hopf technique to obtain a steady-state solution for the transformation of an interface between two dissimilar solids into a corroded interface. Fickian diffusion of the solute occurs in the upper half-space, leading to corrosion by chemical reaction in the lower half-space.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2021)
Article
Mechanics
Yudong Zhang, Xiao Wu, Bangbang Nie, Aiguo Xu, Feng Chen, Ronghan Wei
Summary: In micro- and nanoscale channels, flow characteristics exhibit discontinuity due to the small scale and rarefaction. The conventional continuum-based models are inadequate for describing such flow behavior, therefore adopting kinetic models based on statistical mechanics becomes necessary. This paper presents a novel discrete Boltzmann model specifically tailored for non-equilibrium flows at the micro-nanoscale and demonstrates its effectiveness through numerical simulations.
Article
Energy & Fuels
Yuwei Jin, Moses Amoasi Acquah, Mingyu Seo, Samira Ghorbanpour, Sekyung Han, Taeyoung Jyung
Summary: The steady-state voltage security region (SVSR) is an important criterion for evaluating the power system's operation security and safety margin. However, its application to electric vehicle (EV) proliferation has not been explored. To address this, we propose a load margin index (LMI) based on SVSR considering uncertainties, and use it to assess the impact of EV proliferation. A bi-layer optimal EV scheduling model is employed to solve a dispatching plan for EV aggregators in the upper layer, and model each EV's charging/discharging strategy in the lower layer. A real-time scheduling plan is also used to adjust the day-ahead scheduling based on forecast errors. A case study on the IEEE-33 node distribution network confirms the feasibility and effectiveness of the proposed method.
Letter
Physics, Multidisciplinary
Philip Anderson
Review
History & Philosophy Of Science
Cormac O'Raifeartaigh, Michael O'Keeffe, Werner Nahm, Simon Mitton
EUROPEAN PHYSICAL JOURNAL H
(2017)
Article
History & Philosophy Of Science
Cormac O'Raifeartaigh, Michael O'Keeffe, Werner Nahm, Simon Mitton
EUROPEAN PHYSICAL JOURNAL H
(2018)
Article
History & Philosophy Of Science
Cormac O'Raifeartaigh, Simon Mitton
PHYSICS IN PERSPECTIVE
(2018)
Book Review
History & Philosophy Of Science
Simon Mitton
JOURNAL FOR THE HISTORY OF ASTRONOMY
(2019)
Article
History & Philosophy Of Science
Cormac O'Raifeartaigh, Michael O'Keeffe
PHYSICS IN PERSPECTIVE
(2020)
Article
History & Philosophy Of Science
Cormac O'Raifeartaigh, Michael O'Keeffe, Simon Mitton
Summary: Einstein and de Sitter's 1932 paper introduced a relativistic model that provided a unique relationship between cosmic expansion and matter density, serving as an important benchmark in cosmology. Their work, despite some critics, established a simple model with straightforward mathematical relations that influenced the field for much of the 20th century.
EUROPEAN PHYSICAL JOURNAL H
(2021)
Book Review
Multidisciplinary Sciences
Cormac O'Raifeartaigh
Review
History & Philosophy Of Science
Victor S. Alpher, Simon A. Mitton
Summary: This paper examines the collaboration between George Antonovich Gamow and Ralph Asher Alpher at George Washington University. It focuses on a collection of 53 letters and postcards that Alpher received from Gamow during his absences. The analysis reveals their efforts to improve their model of primordial element building and highlights the strong friendship and scientific discovery that characterized their partnership.
EUROPEAN PHYSICAL JOURNAL H
(2023)
Letter
Physics, Multidisciplinary
Cormac O'Raifeartaigh
Article
Astronomy & Astrophysics
Simon Mitton
ASTRONOMY & GEOPHYSICS
(2017)
Letter
Physics, Multidisciplinary
Cormac O'Raifeartaigh