105 research outputs found
USING A DOE AND EIS TO EVALUATE THE SYNERGISTIC EFFECTS OF LOW TOXICITY INHIBITORS FOR MILD STEEL
Diagnostic accuracy of a clinical diagnosis of idiopathic pulmonary fibrosis: An international case-cohort study
We conducted an international study of idiopathic pulmonary fibrosis (IPF) diagnosis among a large group of physicians and compared their diagnostic performance to a panel of IPF experts. A total of 1141 respiratory physicians and 34 IPF experts participated. Participants evaluated 60 cases of interstitial lung disease (ILD) without interdisciplinary consultation. Diagnostic agreement was measured using the weighted kappa coefficient (\u3baw). Prognostic discrimination between IPF and other ILDs was used to validate diagnostic accuracy for first-choice diagnoses of IPF and were compared using the Cindex. A total of 404 physicians completed the study. Agreement for IPF diagnosis was higher among expert physicians (\u3baw=0.65, IQR 0.53-0.72, p20 years of experience (C-index=0.72, IQR 0.0-0.73, p=0.229) and non-university hospital physicians with more than 20 years of experience, attending weekly MDT meetings (C-index=0.72, IQR 0.70-0.72, p=0.052), did not differ significantly (p=0.229 and p=0.052 respectively) from the expert panel (C-index=0.74 IQR 0.72-0.75). Experienced respiratory physicians at university-based institutions diagnose IPF with similar prognostic accuracy to IPF experts. Regular MDT meeting attendance improves the prognostic accuracy of experienced non-university practitioners to levels achieved by IPF experts
Buckling and Vibration of Functionally Graded Non-uniform Circular Plates Resting on Winkler Foundation
Potency of ZnFe2O4 Nanoparticles as Corrosion Inhibitor for Stainless Steel; the Pigment Extract Study
Design of protective and stabilizing controllers: a study with considering natural events
In renewable systems, there may be conditions that can be either network error
or power transmission line and environmental conditions such as when the wind speed is
unbalanced and the wind turbine is connected to the grid. In this case, the control system
is not damaged and will remain stable in the power transmission system. Voltage stability
studies on an independent wind turbine at fault time and after fixing the error is one of the
topics that can strengthen the future of independent collections. At the time of the fault, the
network current increases dramatically, resulting in a higher voltage drop. Hence the talk
of fast voltage recovery during error and after fixing the error and protection of rotor and
grid side converters against the fault current and also protection against rising DC voltage
(which sharply increases during error) is highly regarded. So, several improvements have
been made to the construction of a doubly-fed induction generator (DFIG) turbine such as:
a) error detection system, b) DC link protection, c) crow bar circuit, d) block of the rotor and
stator side converters, e) injecting reactive power during error, f) nonlinear control design for
turbine blades, g) tuning and harmonization of controllers used to keep up the power quality
and to stabilize the system output voltage in the power grid. First, the dynamic models of
a wind turbine, gearbox, and DFIG are presented. Then the controllers are modeled. The
results of the simulation have been validated in MATLAB/Simulink
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