Results 281 to 290 of about 1,578,105 (322)

Absolute entropy and the observer’s no-boundary state

Journal of High Energy Physics
We investigate the no-boundary proposal for closed universes with an observer. We argue that the observer’s no-boundary state is the identity operator on the physical Hilbert space, i.e., the maximum entropy state and show this explicitly in Jackiw ...
Andreas Blommaert, Jonah Kudler-Flam, Erez Y. Urbach   +2 more
semanticscholar   +1 more source

State-of-charge estimation tolerant of battery aging based on a physics-based model and an adaptive cubature Kalman filter

, 2021
Battery performance declines with aging. This phenomenon makes it difficult to estimate the state-of-charge (SOC) of the battery. Because physics-based battery models (PBMs) can predict the performance decline caused by battery aging with high accuracy ...
Xiaoyu Li, Zhijia Huang, Jindong Tian, Yong Tian   +3 more
semanticscholar   +1 more source

A convolutional neural network-based anthropomorphic model observer for signal-known-statistically and background-known-statistically detection tasks

Physics in Medicine and Biology, 2020
The purpose of this study is implementation of an anthropomorphic model observer using a convolutional neural network (CNN) for signal-known-statistically (SKS) and background-known-statistically (BKS) detection tasks.
Minah Han, J. Baek
semanticscholar   +1 more source

State-of-Charge Estimation Using an EKF-Based Adaptive Observer

IEEE Transactions on Control Systems Technology, 2019
Lithium-ion batteries are used to store energy in electric vehicles. State of charge (SOC) is an important quantity of the battery cells that need to be estimated using limited measurements.
Sepideh Afshar, Kirsten Morris, Amir Khajepour   +2 more
exaly   +2 more sources

Gravitational entropy is observer-dependent

Journal of High Energy Physics
In quantum gravity, it has been argued that a proper accounting of the role played by an observer promotes the von Neumann algebra of observables in a given spacetime subregion from Type III to Type II.
Julian De Vuyst, Stefan Eccles, Philipp A. Hoehn, Josh Kirklin   +3 more
semanticscholar   +1 more source

Crossed products and quantum reference frames: on the observer-dependence of gravitational entropy

Journal of High Energy Physics
A significant step towards a rigorous understanding of perturbative gravitational entropy was recently achieved by a series of works showing that a proper accounting of gauge invariance and observer degrees of freedom converts the Type III algebra of QFT
Julian De Vuyst, Stefan Eccles, Philipp A. Hoehn, Josh Kirklin   +3 more
semanticscholar   +1 more source

Self-Adaptive Neural Network-Based Fractional-Order Nonlinear Observer Design for State of Charge Estimation of Lithium-Ion Batteries

IEEE/ASME transactions on mechatronics
Accurate state of charge (SOC) estimation provides an essential basis for the functionalities of battery management systems in electric vehicles (EVs). However, conventional equivalent circuit models suffer significant model accuracy deterioration under ...
Ruohan Guo, Yiming Xu, Cungang Hu, Weixiang Shen   +3 more
semanticscholar   +1 more source

Cylindrical Battery Fault Detection Under Extreme Fast Charging: A Physics-Based Learning Approach

IEEE transactions on energy conversion, 2021
High power operation in extreme fast charging significantly increases the risk of internal faults in Electric Vehicle batteries which can lead to accelerated battery failure.
Roya Firoozi, S. Sattarzadeh, Satadru Dey   +2 more
semanticscholar   +1 more source

Observational particle physics

Nuclear Physics A, 1988
Abstract A review is given of the detection of neutrinos from the supernova SN1987a and of neutrinos from the sun. Searches for monopoles, dark matter candidates and supersymmetric particles are described, and an outlook on future experiments given.
openaire   +1 more source

Physics-Aware Watermarking Embedded in Unknown Input Observers for False Data Injection Attack Detection in Cyber-Physical Microgrids

IEEE Transactions on Information Forensics and Security
The physics-aware watermarking-based detection method has shown great potential in detecting stealthy False Data Injection Attacks (FDIAs) by adding appropriate watermarks to control commands or sensor measurements, especially in industrial control ...
Mengxiang Liu, Xin Zhang, Hengye Zhu, Zhenyong Zhang, Ruilong Deng   +4 more
semanticscholar   +1 more source