Results 41 to 50 of about 432,453 (195)

Seismic responses of isolated bridges subjected to near-fault ground motions: simple pulses vs. whole records

Frontiers in Built Environment
Velocity pulse with strong energy input is the significant feature of near-fault ground motions. Bridges close to or passing across seismic faults may suffer from higher failure risk, which is inseparable from the influence of velocity pulse.
Ying-Xin Hui, Ying-Xin Hui, Jie Wang, Jie Wang, Jia-Le Lv, Ting-Ting Xu   +5 more
doaj   +1 more source

Negative Group Velocity [PDF]

, 2000
The group velocity for pulses in an optical medium can be negative at frequencies between those of a pair of laser-pumped spectral lines. The gain medium then can amplify the leading edge of a pulse resulting in a time advance of the pulse when it exits ...
Hamilton W. R., Kirk T. McDonald
core   +4 more sources

Analysis of faulting destruction and water supply pipeline damage from the first mainshock of the February 6, 2023 Türkiye earthquake doublet[Key points]

Earthquake Science
In 2023, two consecutive earthquakes exceeding a magnitude of 7 occurred in Türkiye, causing severe casualties and economic losses. The damage to critical urban infrastructure and building structures, including highways, railroads, and water supply ...
Xiaoqing Fan, Libao Zhang, Juke Wang, Yefei Ren, Aiwen Liu   +4 more
doaj   +1 more source

Observations of a pulse driven cool polar jet by SDO/AIA

, 2011
Context. We observe a solar jet at north polar coronal hole (NPCH) using SDO AIA 304 {\deg}A image data on 3 August 2010. The jet rises obliquely above the solar limb and then retraces its propagation path to fall back. Aims.
A. K. Srivastava, Alexander, Bohlin, Brooks, Cirtain, Culhane, De Pontieu, De Pontieu, De Pontieu, De Pontieu, Filippov, Georgakilas, Hansteen, He, Innes, K. Murawski, Kamio, Kamio, Katsukawa, Ko, Lee, Liu, Murawski, Nisticò, Pariat, Shibata, Shibata, Shimojo, Vernazza, Wang, Yokoyama, Yokoyama   +31 more
core   +1 more source

Urbanization as a risk factor for aortic stiffness in a cohort in India. [PDF]

PLoS ONE, 2018
Urbanization is associated with higher prevalence of cardiovascular disease worldwide. Aortic stiffness, as measured by carotid-femoral pulse wave velocity is a validated predictor of cardiovascular disease. Our objective was to determine the association
Laura Corlin, Kevin J Lane, Jahnavi Sunderarajan, Kenneth K H Chui, Harivanza Vijayakumar, Lawrence Krakoff, Anbarasi Chandrasekaran, Sadagopan Thanikachalam, Doug Brugge, Mohan Thanikachalam   +9 more
doaj   +1 more source

Storage and retrieval of light pulses in atomic media with "slow" and "fast" light

, 2005
We present experimental evidence that light storage, i.e. the controlled release of a light pulse by an atomic sample dependent on the past presence of a writing pulse, is not restricted to small group velocity media but can also occur in a negative ...
A. Lezama, F. Renzoni, M. O. Scully, P. Hannaford, V. Smirnov   +4 more
core   +1 more source

Seismic Response of a Large-Span Steel Truss Arch Bridge under Nonuniform Near-Fault Ground Motions

Buildings
The ground motion in the near-fault region of an earthquake is characterized by exceptional energy levels, powerful velocity impulses, substantial spatial variability, and notable permanent displacement.
Zhen Liu, Xingliang Ma, Junlin Lv
doaj   +1 more source

Comparison of arterial stiffness indices measured by pulse wave velocity and pulse wave analysis

Blood Pressure, 2019
Objective: Arterial stiffness indices measured by pulse wave velocity and pulse wave analysis have been widely studied in different populations. Only a few small studies have been reported regarding these two measurement methods.
Hongyan Zhu, Yuan Gao, Huiling Cheng, Yichao Lu, IokFai Cheang, Dongxu Xu, Wenming Yao, Tianbao Xu, Fang Zhou, Yanli Zhou, Fang Xu, Xiangqing Kong, Xinli Li, Haifeng Zhang   +13 more
doaj   +1 more source

A learning-based image processing approach for pulse wave velocity estimation using spectrogram from peripheral pulse wave signals: An in silico study

Frontiers in Physiology, 2023
Carotid-to-femoral pulse wave velocity (cf-PWV) is considered a critical index to evaluate arterial stiffness. For this reason, estimating Carotid-to-femoral pulse wave velocity (cf-PWV) is essential for diagnosing and analyzing different cardiovascular ...
Juan M. Vargas, Mohamed A. Bahloul, Taous-Meriem Laleg-Kirati, Taous-Meriem Laleg-Kirati   +3 more
doaj   +1 more source

Lagrangian measurements of turbulent dissipation over a shallow tidal flat from pulse coherent Acoustic Doppler Profilers [PDF]

, 2012
We present high resolution (25 mm spatial, 8 Hz temporal) profiles of velocity measured over a shallow tidal flat using pulse-coherent Acoustic Doppler Profilers mounted on surface drifters.
Henderson, Stephen M., Mullarney, Julia C.   +1 more
core   +2 more sources