Results 31 to 40 of about 1,948,990 (300)

A novel and fast three-dimensional measurement technology for the objects surface with non-uniform reflection

open access: yesResults in Physics, 2020
Optical three-dimensional (3D) measurement of non-diffuse objects is challenging. At present, a common used method is to adjust the camera’s sensitivity several times to get fringe sequences with different brightness, and then extract the appropriate ...
Jianhua Wang, Yuguo Zhou, Yanxi Yang
doaj   +1 more source

Near-field measurement of continuously modulated fields employing the time-harmonic near- to far-field transformation [PDF]

open access: yesAdvances in Radio Science, 2019
Near-field far-field transformations (NFFFTs) are commonly performed for time-harmonic fields. Considering arbitrary in-situ measurement scenarios with given transmission signals, time-varying aspects of modulated signals have to be taken into ...
F. T. Faul   +7 more
doaj   +1 more source

Validation and interval scale transformation of the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) in patients undergoing knee arthroplasty, using the Rasch model

open access: yesOsteoarthritis and Cartilage Open, 2022
Objectives: Interval scale reduce measurement bias compared to ordinal scale. We aimed to evaluate the fit of Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) to the Rasch model and derive the transformation table for interval scale
Ying-Ying Leung   +4 more
doaj   +1 more source

Comparison of a time-varying covariate model and a joint model of time-to-event outcomes in the presence of measurement error and interval censoring: application to kidney transplantation

open access: yesBMC Medical Research Methodology, 2019
Background Tacrolimus (TAC) is an immunosuppressant drug given to kidney transplant recipients post-transplant to prevent antibody formation and kidney rejection.
Kristen R. Campbell   +5 more
doaj   +1 more source

A comparative study of two methods for uncertainty analysis in power system state estimation [PDF]

open access: yes, 2005
This letter presents a comparative study between twomethods for estimating the uncertainty interval in power system state estimation. Constrained nonlinear and linear formulations are proposed to estimate the tightest possible upper and lower bounds ...
Al-Othman, AK, Irving, MR
core   +1 more source

Development of a Z-score equation for atrioventricular interval measurement by two-dimensional pulsed Doppler echocardiography in normal fetuses between 16 and 33+6 weeks of gestation [PDF]

open access: yesUltrasonography
Purpose Fetal echocardiography is the primary diagnostic tool for assessing the atrioventricular (AV) time interval. Establishing a reference range for this parameter throughout pregnancy is essential for the early detection of potential abnormalities ...
Luciane Alves da Rocha Amorim   +7 more
doaj   +1 more source

Sampling Time Effects for Persistence and Survival in Step Structural Fluctuations

open access: yes, 2005
The effects of sampling rate and total measurement time have been determined for single-point measurements of step fluctuations within the context of first-passage properties.
C. Dasgupta   +11 more
core   +1 more source

Analysis of Low Frequency Oscillation Using the Multi-Interval Parameter Estimation Method on a Rolling Blackout in the KEPCO System

open access: yesEnergies, 2017
This paper describes a multiple time interval (“multi-interval”) parameter estimation method. The multi-interval parameter estimation method estimates a parameter from a new multi-interval prediction error polynomial that can simultaneously consider ...
Kwan-Shik Shim   +3 more
doaj   +1 more source

Reliability analysis of helium pressure non-destructive testing method of the fuel rod

open access: yesHe jishu, 2023
BackgroundCurrently, the destructive puncture manometry method is used to measure helium pressure inside fuel rods. However, this method is expensive and does not guarantee 100% coverage.
HUANG Fan   +4 more
doaj   +1 more source

Phase-coherence time saturation in mesoscopic systems: wave function collapse

open access: yes, 2000
A finite phase-coherence time $\tau_{\phi}^{meas}$ emerges from iterative measurement onto a quantum system. For a rapid sequence, the phase-coherence time is found explicitly. For the stationary charge conduction problem, it is bounded. At all order, in
A. Bohm   +23 more
core   +1 more source

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