Results 121 to 130 of about 19,320 (310)

Associations between heart rate asymmetry expression and asymmetric detrended fluctuation analysis results. [PDF]

open access: yesMed Biol Eng Comput, 2022
Piskorski J   +8 more
europepmc   +1 more source

Nonlinear trend removal should be carefully performed in heart rate variability analysis [PDF]

open access: yes, 2016
$\bullet$ Background : In Heart rate variability analysis, the rate-rate time series suffer often from aperiodic non-stationarity, presence of ectopic beats etc. It would be hard to extract helpful information from the original signals.
Dubois, Rémi   +3 more
core   +2 more sources

Software to Support Remote Sensing of River Discharge Based on Critical Flow Theory

open access: yesRiver Research and Applications, EarlyView.
ABSTRACT Water resource management requires accurate observations of streamflow but standard field methods for measuring river discharge (Q$$ Q $$) can be costly and hazardous for equipment and personnel. Remote sensing has become a viable alternative, but many image‐based techniques require field data for calibration, and depth and velocity can seldom
Carl J. Legleiter, Inhyeok Bae
wiley   +1 more source

Empirical properties of inter-cancellation durations in the Chinese stock market

open access: yesFrontiers in Physics, 2014
Order cancellation process plays a crucial role in the dynamics of price formation in order-driven stock markets and is important in the construction and validation of computational finance models.
Gao-Feng eGu   +10 more
doaj   +1 more source

Development of electron source feedback for enhanced X‐ray beam stability at NSLS‐II

open access: yesJournal of Synchrotron Radiation, EarlyView.
An electron‐source feedback method has been demonstrated at the NSLS‐II Hard X‐ray Nanoprobe, using X‐ray beam position data to drive electron beam corrections. The approach suppresses dominant vibration peaks and significantly improves X‐ray beam stability and ptychographic image quality.Future synchrotron light sources are being designed to deliver ...
Sukho Kongtawong   +9 more
wiley   +1 more source

Population trends and variability within bird communities are amplified by intense land use

open access: yesJournal of Animal Ecology, EarlyView.
We show that bird populations in farmland have stronger long‐term changes and are more variable around these changes than in woodland. Disentangling these two components of population stability helps understand the effects of anthropogenic pressures on wild communities.
Josquin Guerber   +2 more
wiley   +1 more source

Rising Tides, Falling Harvests: Examining the Effects of Salinity Intrusion on Paddy Production in Vietnam's Mekong Delta

open access: yesJournal of Agricultural Economics, EarlyView.
ABSTRACT Rising sea levels and salinity intrusion increasingly threaten rice farming in Vietnam's Mekong Delta. Using a district‐level panel dataset from 2000 to 2020, this study examines the impacts of salinity on Winter–Spring rice yields and acreage and how farmers adapt to salinity risk.
Huong Nguyen   +3 more
wiley   +1 more source

基于MF-DFA和SVM的齿轮箱故障诊断

open access: yesJixie chuandong, 2014
The fault signal of the gearbox is the complex signal of the non-stationary and nonlinear characteristics,by using the multifractal detrended fluctuation analysis(MF-DFA)and the support vector machine(SVM)to diagnose the fault of the gearbox.The ...
刘春林   +3 more
doaj  

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