Results 31 to 40 of about 4,488,266 (309)

Hybrid k-means-PSO Technique for Transformer Insulation Moisture Determination in the Production Stage Based on Frequency Response Analysis

Iranian Journal of Electrical and Electronic Engineering, 2022
Moisture in the transformer insulation can shorten its life. There are many methods for detecting humidity in transformer paper insulation. One of the methods used in the factory to evaluate the drying process of transformer insulation and determine its ...
M. Bigdeli
doaj  

Online High Frequency Impedance Identification Method of Inverter-Fed Electrical Machines for Stator Health Monitoring

Applied Sciences
In electric powertrain traction applications, the adopted trend to improve the performance and efficiency of electromechanical power conversion systems is to increase supply voltages and inverter switching frequencies.
Jérémy Creux, Najla Haje Obeid, Thierry Boileau, Farid Meibody-Tabar   +3 more
doaj   +1 more source

Application of Frequency Response Analysis Technique to Detect Transformer Tap Changer Faults

Applied Sciences, 2021
Power transformers are located in the electrical transmission and distribution networks where different voltage levels are needed. The turn ratio of the low voltage and high voltage windings is mechanically controlled by an on-load tap changer or de ...
Salem Mgammal Al-Ameri, Abdulaziz Almutairi, Muhammad Saufi Kamarudin, Mohd Fairouz Mohd Yousof, Ahmed Abu-Siada, Mohamed Ibrahim Mosaad, Saeed Alyami   +6 more
doaj   +1 more source

Negative high-frequency differential conductivity in semiconductor superlattices

, 2002
We examine the high-frequency differential conductivity response properties of semiconductor superlattices having various miniband dispersion laws. Our analysis shows that the anharmonicity of Bloch oscillations (beyond tight-binding approximation) leads
Andronov A. A., Gulyaev Y. V., Keldysh L. V., Ktitorov S. A., Lev G. Mourokh, Norman J. M. Horing, Orlov L. K., Orlov L. K., Ovsyannikov M. I., Romanov Y. A., Yuriy A. Romanov   +10 more
core   +1 more source

A Quality Improvement Initiative to Standardize Pneumocystis jirovecii Pneumonia Prophylaxis in Pediatric Patients With Solid Tumors

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Background Pediatric patients with extracranial solid tumors (ST) receiving chemotherapy are at an increased risk for Pneumocystis jirovecii pneumonia (PJP). However, evidence guiding prophylaxis practices in this population is limited. A PJP‐related fatality at our institution highlighted inconsistent prescribing approaches and concerns about
Kriti Kumar, Denise M. Connolly, Ellen Kellington, Elyse Zelunka, Karla Kerrigan, Furqan Shaikh, Paul C. Nathan, Meredith S. Irwin, Sarah Cohen‐Gogo   +8 more
wiley   +1 more source

The validation of an aerospace structure through the sine vibration analysis [PDF]

INCAS Bulletin, 2018
Sinusoidal vibrations represent an ideal case. Technically, it is quite hard to generate pure sinusoidal vibrations without containing other spectral components, called harmonics.
Cristina-Diana BRATU, Ionut-Cosmin ONCESCU, Ion DIMA, Alexandra Raluca PETRE   +3 more
doaj   +1 more source

Transmission Lines Impedance Fitting Using Analytical Impedance Equation and Frequency Response Analysis

Mathematics, 2022
Rational function approximation is commonly used to fit the transmission line impedance over a wide frequency range. Nevertheless, it is computationally costly and challenging to implement in practical applications due to the high number of ...
Hosam Alharbi, Muhammad Khalid, Mohammad Abido   +2 more
doaj   +1 more source

Frequency‐Domain Response Analysis for Quantitative Systems Pharmacology Models [PDF]

CPT: Pharmacometrics & Systems Pharmacology, 2017
Drug dosing regimen can significantly impact drug effect and, thus, the success of treatments. Nevertheless, trial and error is still the most commonly used method by conventional pharmacometric approaches to optimize dosing regimen. In this tutorial, we utilize four distinct classes of quantitative systems pharmacology models to introduce frequency ...
Schulthess, P., Post, T.M., Yates, J.W.T., Graaf, P.H. van der   +3 more
openaire   +3 more sources

Sickle Cell Disease Is an Inherent Risk for Asthma in a Sibling Comparison Study

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Introduction Sickle cell disease (SCD) and asthma share a complex relationship. Although estimates vary, asthma prevalence in children with SCD is believed to be comparable to or higher than the general population. Determining whether SCD confers an increased risk for asthma remains challenging due to overlapping symptoms and the ...
Suhei C. Zuleta De Bernardis, Okeleji Olayinka, Mariam Z. Quraishi, Lakshmi V. Srivaths, Deborah L. Brown, Neethu M. Menon, Ricardo A. Mosquera, Ashwin P. Patel, James M. Stark, Aravind Yadav   +9 more
wiley   +1 more source

Design Improvement of a Semi-submersible Floating Offshore Wind Turbines through Frequency-domain Load Analyses

한국해양공학회지
The purpose of this study is to analyze the differences in motion response performances according to the design variables of semi-submersible substructures supporting floating offshore wind turbines (FOWTs) and propose an improved design.
Soo Bin Lee, Joonmo Choung
doaj   +1 more source