Article
Materials Science, Multidisciplinary
Ceren B. Dag, Yidan Wang, Philipp Uhrich, Xuesen Na, Jad C. Halimeh
Summary: We find a self-similar prethermal dynamical regime in the time evolution of one-dimensional spin chains when quenching near a quantum phase transition. This regime is analytically determined by the ground-state energy gap and exists universally regardless of the probe site, weak interactions, or the initial state. The resulting prethermal dynamics result in an out-of-equilibrium scaling function of the order parameter near the transition. Our theory suggests that sudden quench dynamics can lead to universal critical slowing down near the critical point.
Article
Multidisciplinary Sciences
Paul Brookes, Giovanna Tancredi, Andrew D. Patterson, Joseph Rahamim, Martina Esposito, Themistoklis K. Mavrogordatos, Peter J. Leek, Eran Ginossar, Marzena H. Szymanska
Summary: This study explores the rich quantum activation dynamics and critical slowing down in an engineered superconducting quantum circuit, specifically in the intermediate bistable regime of the generalized Jaynes-Cummings Hamiltonian. A previously unidentified regime of quantum activation with saturation of critical slowing down is found, shedding light on the fundamental role played by the qubit in this regime through comparison with experimental results and various models.
Article
Physics, Fluids & Plasmas
Kurt Langfeld, Pavel Buividovich, P. E. L. Rakow, James Roscoe
Summary: Wang-Landau simulations provide a way to integrate over a collective coordinate and the remainder of configuration space. By choosing the slow mode for collective integration, it is possible to reduce critical slowing down. In the study of the Ising model, it is found that using the magnetization as the collective coordinate can eliminate supercritical slowing down.
Article
Engineering, Geological
Zhenghu Zhang, Yingchun Li, Lihua Hu, Chun'an Tang, Hongchun Zheng
Summary: This study investigated the critical slowing down characteristics and precursory signals preceding catastrophic rock failure by analyzing acoustic emission (AE) signals in laboratory experiments on different types of rock specimens. The results demonstrate that sudden increases in AE variance and autocorrelation coefficient can serve as precursors for rock failure. Early warning time intervals and relationships between precursory signals and influencing factors were discussed, highlighting the importance of these signals for forecasting geological disasters in rock engineering.
ENGINEERING GEOLOGY
(2021)
Article
Physics, Multidisciplinary
R. A. Alharbey, S. S. Hassan
Summary: The phenomenon of critical slowing down (CSD) of switching time in response to perturbation beta (0 < beta < 1) of control parameters at critical points of steady state bistable curves is investigated in two biological models, namely the spruce budworm outbreak model and the Thomas reaction model for enzyme membrane, using fractional derivative forms of order alpha (0 < alpha < 1) that allow for memory mechanism. Two definitions of fractional derivative, Caputo's and Caputo-Fabrizio's, are used and yield the same qualitative results. The interplay of the parameters alpha (as memory index) and beta shows that the time delay tau(D) can either be reduced or increased compared to the case of ordinary derivative (alpha = 1). Furthermore, tau(D) can be fitted as a function of beta using the scaling inverse square root formula 1/root beta at a fixed fractional derivative index (alpha < 1), and as a function of alpha (0 < alpha < 1) an exponentially increasing form at a fixed perturbation parameter beta.
FRONTIERS IN PHYSICS
(2023)
Article
Physics, Multidisciplinary
Jordan L. Shivers, Abhinav Sharma, Fred C. Mackintosh
Summary: Networks and dense suspensions near the boundary between soft and rigid regimes undergo transitions driven by changes in structure, density, stress, or strain. In this study, we establish a simple quantitative relationship between nonaffinity and excess viscosity and demonstrate its rheological consequences in strained filament networks and dense suspensions. We also predict critical signatures in the rheology of semiflexible and stiff biopolymer networks near the strain stiffening transition.
PHYSICAL REVIEW LETTERS
(2023)
Article
Multidisciplinary Sciences
Jie Li, Matteo Convertino
Summary: The study highlights the impact of temperature increase on fish community dynamics, with a decrease in fish diversity and changes in dominant species. Competitive species are more affected by temperature changes, while cooperative species may remain more stable. The findings suggest that temperature fluctuations play a crucial role in shaping species interactions within fish ecosystems.
Article
Mathematics
Hadia Ali, Ali Mahmood-ul-Hassan, Ali Akgul, Ali Saleh Alshomrani
Summary: In this paper, the scattering of plane waves through two junctions with step-down cascading discontinuities is presented. Trapped modes in the form of discrete eigenvalues are also discussed. The study focuses on the matching of continuity of pressure and velocity, energy conservation, convergence/error of reflection, and reflection and transmission of the incident wave. The results provide insights into modeling the practical exhaust system in noise reduction theory.
Article
Physics, Multidisciplinary
Chia-Jung Yang, Kristin Kliemt, Cornelius Krellner, Johann Kroha, Manfred Fiebig, Shovon Pal
Summary: Using terahertz time-domain spectroscopy, evidence for fermionic critical slowing down in YbRh2Si2 close to a quantum phase transition is found. The heavy-fermion quasiparticles in the heavy-Fermi-liquid state break down at the transition, as indicated by measurements of critical slowing down. This breakdown of heavy-fermion quasiparticles near the quantum phase transition could classify this system among a wider family of fermionic quantum phase transitions that is yet to be fully explored.
Article
Chemistry, Physical
Geert Kapteijns, David Richard, Eran Bouchbinder, Thomas B. Schroder, Jeppe C. Dyre, Edan Lerner
Summary: This study proposes a potential factor controlling the viscous slowing down, the mesoscopic elastic stiffness κ(T), and finds it increases more strongly with decreasing temperature compared to the macroscopic inherent structure shear modulus G(T). Additionally, a direct connection between the liquid's underlying mesoscopic elasticity and enthalpic energy barriers is suggested by the relation ΔE(T) proportional to κ(T) in some computer liquids. However, this relation fails in liquids with highly fragmented potential energy landscapes.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Chemistry, Physical
Mingyuan Zheng, Marco Tarzia, Patrick Charbonneau
Summary: This study provides a generic insight into the phenomenon of critical slowing down by studying one-dimensional and Bethe lattice versions of the ANNNI model. Through the formulation of two cluster algorithms, simulations of the ANNNI model on a 2D square lattice are significantly sped up.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Wenqian Zhang, Yadong Wu, Xingze Qiu, Jue Nan, Xiaopeng Li
Summary: Critical slowing-down (CSD) is a characteristic of critical dynamics for equilibrium phase transitions in a many-body system, where the relaxation time for the system to reach thermal equilibrium or the quantum ground state diverges with system size. The time-crystal phase transition has attracted attention in recent years as it provides a scenario of phase transition in quantum dynamics. In this study, we investigate critical dynamics near the Floquet time-crystal phase transition and demonstrate the occurrence of CSD through the analysis of a one-dimensional disordered spin chain. It is revealed that the relaxation time near the critical point has a subexponential scaling behavior, in contrast to the power-law behavior observed in equilibrium phase transitions. This prediction can be tested in quantum simulation experiments.
Article
Geosciences, Multidisciplinary
Yao Tang, Xing Zhu, Chunlei He, Jiewei Hu, Jie Fan
Summary: The study explored the precursor characteristics of instability in sandstone containing prefabricated fractures and intact sandstone based on the critical slowing down theory, showing that the CSD characteristics of different dissipation energy dynamical systems varied, leading to different times of CSD phenomena for distinct systems.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Chemistry, Physical
Michio Tateno, Taiki Yanagishima, Hajime Tanaka
Summary: The study on colloidal gelation using core-shell fluorescent colloidal particles reveals that the enhancement of local packing and the formation of locally stable rigid structures are the key factors leading to gel formation during phase separation. These findings support a mechanical perspective on dynamic arrest of sticky-sphere systems based on microstructure, replacing conventional explanations based on macroscopic vitrification of colloidal-rich phase.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Biology
Weiting Zhang, Pierluigi Scerbo, Marine Delagrange, Virginie Candat, Vanessa Mayr, Sophie Vriz, Martin Distel, Bertrand Ducos, David Bensimon
Summary: The study reveals that in Zebrafish, the dynamics of fgf8 and other gene transcripts, as well as segmentation frequency, shortening of pre-somitic mesoderm, and tail growth rate slow down with lower temperature, potentially explaining the temperature independence of somitogenesis.
COMMUNICATIONS BIOLOGY
(2022)
Article
Energy & Fuels
Chenjun Sun, Zengqiang Mi, Hui Ren, Fei Wang, Jing Chen, David Watts, Jinling Lu
Review
Green & Sustainable Science & Technology
Rodrigo Perez Odeh, David Watts, Yarela Flores
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2018)
Review
Green & Sustainable Science & Technology
Rodrigo Perez Odeh, David Watts, Matias Negrete-Pincetic
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2018)
Article
Green & Sustainable Science & Technology
V. Villalon, D. Watts, R. Cienfuegos
Article
Energy & Fuels
Chenjun Sun, Zengqiang Mi, Hui Ren, Zhipeng Jing, Jinling Lu, David Watts
Article
Energy & Fuels
Mansaku Maeda, David Watts
Article
Green & Sustainable Science & Technology
Rodrigo Perez Odeh, David Watts
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2019)
Article
Energy & Fuels
Camilo Aviles A, Sebastian Oliva H, David Watts
Article
Energy & Fuels
Cristian Bustos, David Watts, Daniel Olivares
Article
Computer Science, Information Systems
K. Balzer, D. Watts
Summary: In Chile, the electric generation system consists of two complementary systems - renewable energy and conventional energy. The concentrated solar and wind generation in the northern area of Chile poses challenges in frequency control and market modeling. Primary frequency control is a crucial complementary service for integrating large-scale renewable energy.
IEEE LATIN AMERICA TRANSACTIONS
(2022)
Review
Green & Sustainable Science & Technology
Joaquin Lazo, Gerson Aguirre, David Watts
Summary: To stop the spread of COVID-19, governments have implemented unprecedented confinement measures, leading to paralysis in the commercial and industrial sectors and a significant reduction in electricity demand. This has resulted in technical and financial consequences for the electricity sector, particularly impacting the wind and solar PV energy sectors. Differences exist in economic recovery planning, with developed countries focusing on green economic recovery and the creation of green jobs, while developing countries allocate fewer resources to social protection and economic stimulus programs, postponing climate objectives.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2022)
Article
Energy & Fuels
Joaquin Lazo, Gerson Aguirre, Juan Ovalle, David Watts
Summary: Ibero-America, a region with high pre-existing poverty, has been significantly affected by the pandemic. This article provides a descriptive review of the targeted subsidies implemented in eight Ibero-American countries during the COVID-19 pandemic, the targeting mechanisms, and modifications made to pre-existing subsidies. The research demonstrates that the Ibero-American regulatory response is consistent with international measures and is relevant for policymakers to prepare for future health crises.
ENERGY STRATEGY REVIEWS
(2023)
Review
Green & Sustainable Science & Technology
Joaquin Lazo, David Watts
Summary: In response to a competitive electricity market and government incentives, more academic papers are using real options approach (ROA) to plan and evaluate solar PV projects. This paper reviews the use of ROA in the PV literature, identifying common real options, uncertainty sources, and valuation methods. The reviewed papers are classified into categories such as market conditions, operational flexibility, energy storage systems, public policies, and power generation portfolios. The research provides valuable insights for researchers, investors, and policymakers on the impact of policies and market conditions on PV projects and investment timing.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2023)
Article
Energy & Fuels
Kristian Balzer, Joaquin Lazo, David Watts
Summary: This study proposes an economic modeling methodology for the real-time ancillary services market, which integrates the variability of solar-wind generation, a demand monitoring curve, and the trajectory of marginal cost using a dynamic hourly mathematical model. The results of this model can reduce the operation costs of reserves by up to 60% and the displacement of marginal costs by 10 to 40% compared to traditional methodologies.
Review
Computer Science, Information Systems
J. Ortega, D. Watts, H. Ren
IEEE LATIN AMERICA TRANSACTIONS
(2017)
Article
Engineering, Electrical & Electronic
Ehsan Rahmkhoda, Jawad Faiz, Moein Abedini
Summary: This paper investigates the failures and errors of loss-of-excitation (LOE) protection and proposes an intelligent method combined with a learning vector quantization (LVQ) neural network. The simulation results demonstrate that the proposed algorithm can detect LOE conditions quickly and prevent stresses applied to the machine and power system.
ELECTRIC POWER SYSTEMS RESEARCH
(2024)
Article
Engineering, Electrical & Electronic
Andre M. Garcia, Leonardo H. Macedo, Ruben Romero
Summary: This article presents a specialized scatter search algorithm to solve the optimal transmission switching problem considering voltage control, and its efficiency is validated through tests.
ELECTRIC POWER SYSTEMS RESEARCH
(2024)
Article
Engineering, Electrical & Electronic
Adel F. Alrasheedi, Khalid A. Alnowibet, Ahmad M. Alshamrani
Summary: This paper studies the bidding strategy problem of microgrid in a day-ahead electricity market. The DA electricity prices, demand, and uncertainties are modeled using different scenarios and robust optimization. A smart predict-and-optimize methodology is proposed, where a cost-oriented prediction model is used to replace accuracy-oriented methods. The trilevel mathematical programming approach is utilized to construct a cost-oriented model and solve the problem.
ELECTRIC POWER SYSTEMS RESEARCH
(2024)
Article
Engineering, Electrical & Electronic
Depin Lv, Qiusheng Yu, Xiaoyong Wang, Yulian Bo, Yongjing Wei, Lei Liu, Pu Zhang, Yan Zhang, Wensheng Zhang
Summary: This study proposes a method based on the MHA-CNN framework to monitor the operation status of the smart grid and power communication network coupling. The method utilizes HHT to extract features from operational data and employs MHA to extract key feature information from fault data, achieving faster fault detection speed and higher detection probability.
ELECTRIC POWER SYSTEMS RESEARCH
(2024)
Article
Engineering, Electrical & Electronic
Tao Zhang, Zhiguo Hao, Hongyue Ma, Songhao Yang, Chongtao Li
Summary: This paper introduces a dominant mode identification (DMI) method to assess the stability of grey-box grid-tied converters. The method analyzes the critical eigenvalues and can be applied to different grid connection scenarios.
ELECTRIC POWER SYSTEMS RESEARCH
(2024)
Article
Engineering, Electrical & Electronic
Aamir Nawaz, Hongtao Wang, Huiting Yang, Hammad Armghan, Jiechao Gao
Summary: This paper presents a risk constrained probabilistic problem framework for addressing the challenges of stochastic dispatching due to contingencies and the integration of renewable sources. By utilizing probabilistic analytical target cascading, polynomial chaos expansion, and benders decomposition algorithm, the proposed method reduces computational burden and improves efficiency.
ELECTRIC POWER SYSTEMS RESEARCH
(2024)
Article
Engineering, Electrical & Electronic
Thongchart Kerdphol, Issarachai Ngamroo, Tossaporn Surinkaew
Summary: This paper introduces an enhanced robust H-infinity technique to improve the regulation performance and cyber resiliency of secondary frequency control in a microgrid. The study shows that cyber-attacks affect different elements of secondary frequency control in the microgrid depending on the type of attack used.
ELECTRIC POWER SYSTEMS RESEARCH
(2024)
Article
Engineering, Electrical & Electronic
Sambeet Mishra, Praveen Prakash Singh, Ivar Kiitam, Muhammad Shafiq, Ivo Palu, Chiara Bordin
Summary: This study aims to analyze partial discharge events in high-voltage cables and extract patterns and trends. The results indicate a positive correlation between the number of PD events and the increase in voltage levels, with negative PD peaks being more frequent at lower stress levels.
ELECTRIC POWER SYSTEMS RESEARCH
(2024)
Article
Engineering, Electrical & Electronic
Cleberton Reiz, Jonatas B. Leite, Clara S. Gouveia, Mohammad Sadegh Javadi
Summary: This research proposes a bilevel method to simultaneously solve the allocation and coordination problems in microgrid protection, considering local devices. The results show that solving these problems simultaneously can save costs and select the optimal solution.
ELECTRIC POWER SYSTEMS RESEARCH
(2024)
Article
Engineering, Electrical & Electronic
Rasha Elazab, M. Ser-Alkhatm, Maged A. Abu Adma, K. M. Abdel-Latif
Summary: This paper proposes a two-layer methodology for the allocation and sizing of SVCs in radial distribution systems. The Power Loss Index (PLI) is used to choose the best candidate buses for allocating SVCs, and a two-stage stochastic programming algorithm is proposed to solve the sizing problem. The advantages of combining SVCs and the PV inverter's reactive power provision ability are also analyzed.
ELECTRIC POWER SYSTEMS RESEARCH
(2024)
Article
Engineering, Electrical & Electronic
Samreen Javaid, Dongyu Li, Abhisek Ukil
Summary: This paper introduces a new algorithm based on high pass filter for traveling wave fault location, which can differentiate the peak value of the traveling wave more easily by removing oscillation in the signal. The algorithm is tested on a DC simulation model and executed in MATLAB environment, achieving high accuracy in fault location results. Compared with traditional methods, this algorithm shows higher accuracy and faster response.
ELECTRIC POWER SYSTEMS RESEARCH
(2024)
Article
Engineering, Electrical & Electronic
Enzhe Wang, Xiangrong Chen, Hanshan Zhu, Kai Yin, Muhammad Awais, Ashish Paramane
Summary: This paper aims to reduce the power loss of tunnel cable systems by using different grounding and loss reduction methods. The case study of the submarine tunnel power cable project in Ningbo-Zhoushan, China is considered. The nodal admittance matrices of the cable are established using the telegraph equation, and the cascading algorithm is used to analyze the induced voltage and circulating current in the cable sheath, taking into account the presence of grounding node. The study finds that coordinating the amplitude and phase angle of series impedance can reduce the power loss of the cable system.
ELECTRIC POWER SYSTEMS RESEARCH
(2024)
Article
Engineering, Electrical & Electronic
Ziwei Ma, Jasronita Jasni, Mohd Zainal Abidin Ab Kadir, Norhafiz Azis
Summary: A numerical model was developed to analyze lightning attachment on UHV-AC double-circuit transmission lines. Simulation results showed that upward leaders simultaneously occurred on the ground wire and the upper-phase conductor when the phase conductors were energized. A new expression for calculating the striking distance on the ground wire was proposed based on the simulation results. Additionally, high voltage, phase angle, and terrain slope were found to increase the surface electric field of the upper-phase conductor.
ELECTRIC POWER SYSTEMS RESEARCH
(2024)
Article
Engineering, Electrical & Electronic
Kunal Kumar, Susmita Kar
Summary: This paper presents an efficient protection scheme utilizing the rate of change parameter to detect both shunt faults and high impedance faults. By comparing with the existing scheme and testing on the IEEE 13 Bus test system, the effectiveness of the proposed scheme is demonstrated.
ELECTRIC POWER SYSTEMS RESEARCH
(2024)
Article
Engineering, Electrical & Electronic
Cheng Che, Bangbang He, Zhixuan Gao, Qiwei Lu, Yang Chen, Zhifeng Wang, Jinghan Guo, Yanwen Wang
Summary: A low-cost hybrid railway power conditioner (HRPC) technology scheme is proposed in this paper to effectively compensate negative sequence current (NSC) of the V/v traction system and reduce the capacity and cost of the railway power conditioner (RPC). The proposed HRPC combines an RPC with a modular multilevel converter structure (MMC-RPC) and a railway static var compensator (RSVC) and considers regenerative braking energy in the compensation process.
ELECTRIC POWER SYSTEMS RESEARCH
(2024)