Results 21 to 30 of about 278,088 (264)

Optimal Design and Distribution of Viscous Dampers for Shear Building Structures Under Seismic Excitations

Frontiers in Built Environment, 2019
Viscous dampers (VDs) are effective and widely used passive devices for the protection of civil structures, provided that appropriate design is carried out. For this purpose, optimal design and optimum distribution of VDs method are presented for a shear
Huseyin Cetin, Ersin Aydin, Baki Ozturk
doaj   +1 more source

Critical Response of Nonlinear Base-Isolated Building Considering Soil-Structure Interaction Under Double Impulse as Substitute for Near-Fault Ground Motion

Frontiers in Built Environment, 2018
The critical nonlinear response considering soil-structure interaction is investigated for a base-isolated building under a double impulse as a substitute for near-fault earthquake ground motions.
Hiroki Akehashi, Kotaro Kojima, Kohei Fujita, Izuru Takewaki   +3 more
doaj   +1 more source

Collapse-Limit Input Level of Critical Double Impulse for Damped Bilinear Hysteretic SDOF System With Negative Post-yield Stiffness

Frontiers in Built Environment, 2019
The collapse-limit input velocity level of the critical double impulse simulating the principal part of near-fault ground motions is derived for an elastic-plastic structure with viscous damping and P-delta effect.
Yoshito Saotome, Kotaro Kojima, Izuru Takewaki   +2 more
doaj   +1 more source

Critical Response of Single-Degree-of-Freedom Damped Bilinear Hysteretic System under Double Impulse As Substitute for Near-Fault Ground Motion

Frontiers in Built Environment, 2018
A double impulse input is used as a substitute for near-fault earthquake ground motions. An explicit expression is derived on the maximum elastic–plastic response of a single-degree-of-freedom damped structure with bilinear hysteresis under the “critical
Hiroki Akehashi, Kotaro Kojima, Izuru Takewaki   +2 more
doaj   +1 more source

Analysis of Synchronous Generator Self-Excitation under Capacitive Load Condition in Variable-Frequency Aviation Power System

Machines, 2022
As power electronic converters become more widely used in aviation power systems, the associated capacitive loads in the harmonic filter circuits increase accordingly.
Haigang Liu, Chu Sun, Mengyu He, Na Wang, Yuanjun Zhou   +4 more
doaj   +1 more source

High pressure effects on the excitation spectra and dipole properties of Li, Be+, and B2+ atoms under confinement

Matter and Radiation at Extremes, 2020
Properties of atoms and molecules undergo significant changes when subjected to spatial confinement. We study the excitation spectra of lithium-like atoms in the initial 1s22s electronic configuration when confined by an impenetrable spherical cavity. We
C. Martínez-Flores, R. Cabrera-Trujillo
doaj   +1 more source

Critical properties of quantum three- and four-state Potts models with boundaries polarized along the transverse field

SciPost Physics Core, 2022
By computing the low-lying energy excitation spectra with the density matrix renormalization group algorithm we show that boundaries polarized in the direction of the transverse field lead to scale-invariant conformal towers of states at the critical ...
Natalia Chepiga
doaj   +1 more source

Velocity of excitations in ordered, disordered, and critical antiferromagnets

Physical Review B, 2015
We test three different approaches, based on quantum Monte Carlo simulations, for computing the velocity $c$ of triplet excitations in antiferromagnets. We consider the standard $S=1/2$ one- and two-dimensional Heisenberg models, as well as a bilayer Heisenberg model at its critical point.
Sen, Arnab, Suwa, Hidemaro, Sandvik, Anders W.   +2 more
openaire   +3 more sources

Safe Model-Based Reinforcement Learning for Systems With Parametric Uncertainties

Frontiers in Robotics and AI, 2021
Reinforcement learning has been established over the past decade as an effective tool to find optimal control policies for dynamical systems, with recent focus on approaches that guarantee safety during the learning and/or execution phases.
S. M. Nahid Mahmud, Scott A. Nivison, Zachary I. Bell, Rushikesh Kamalapurkar   +3 more
doaj   +1 more source

Nonstationary Random Critical Seismic Excitations [PDF]

Journal of Engineering Mechanics, 1987
A method is presented to find nonstationary random seismic excitations with a constraint on mean square value such that the response variance of a given linear system is maximized. It is also possible to incorporate the dominant input frequency into the analysis.
Iyengar, RN, Manohar, CS
openaire   +1 more source