Results 31 to 40 of about 488 (140)

Detection of Incipient Faults in Power Transformers using Fuzzy Logic and Decision Tree Models Based on Dissolved Gas Analysis

ABUAD Journal of Engineering Research and Development
This paper proposes an integrated approach utilizing Fuzzy Logic and Decision Tree algorithms to diagnose early-stage faults in power transformers based on Dissolved Gas Analysis (DGA) test results of transformer insulation oil.
Felix Olowolafe, Kehinde Olukunmi Alawode   +1 more
doaj   +1 more source

Reliable Estimation for Health Index of Transformer Oil Based on Novel Combined Predictive Maintenance Techniques

IEEE Access, 2022
Transformer oil insulation condition may be deteriorated due to electrical and thermal faults, which may lead to transformer failure and system outage. In this regard, the first part of this paper presents comprehensive maintenance for power transformers
Mohamed Badawi, Shimaa A. Ibrahim, Diaa-Eldin A. Mansour, Adel A. El-Faraskoury, Sayed A. Ward, Karar Mahmoud, Matti Lehtonen, Mohamed M. F. Darwish   +7 more
doaj   +1 more source

Forensic Hydraulic Analysis of Floodplain Connectivity Driven by Historical Beaver Dams in Colorado Headwater Streams

River Research and Applications, EarlyView.
ABSTRACT As ecosystem engineers, beavers (Castor canadensis) modify river corridor form through dam building. When beavers are removed from a river corridor, their unmaintained dams wash out, altering the stream's hydrologic regime. The assumption that beaver dams increase floodplain connectivity is frequently presumed but has not been directly ...
Kayla Schultz, Ryan R. Morrison, Sara Rathburn, Connor Mertz, Nicholas Christensen   +4 more
wiley   +1 more source

Comparison of Dissolved Gases in Mineral and Vegetable Insulating Oils under Typical Electrical and Thermal Faults

Energies, 2016
Dissolved gas analysis (DGA) is attracting greater and greater interest from researchers as a fault diagnostic tool for power transformers filled with vegetable insulating oils.
Chenmeng Xiang, Quan Zhou, Jian Li, Qingdan Huang, Haoyong Song, Zhaotao Zhang   +5 more
doaj   +1 more source

Influence of ageing on oil degradation and gassing tendency under high-energy electrical discharge faults for mineral oil and synthetic ester

High Voltage, 2020
In this work, mineral oil and synthetic esters were selected at different ageing factors (based on acidity values). Fresh and aged oils have been subjected to high-energy discharges (repeated 100 breakdowns) to simulate electric faults of highly ...
L. Loiselle, U. Mohan Rao, I. Fofana, I. Fofana   +3 more
doaj   +1 more source

Effective Behavior Change Techniques for Successful Weight Loss and Weight Loss Maintenance Among Adults With Overweight and Obesity: A Systematic Review and Meta‐Analysis

Obesity Reviews, EarlyView.
ABSTRACT Achieving and maintaining weight loss are challenging and require sustained lifestyle changes. This study examined which behavior change techniques (BCTs) support long‐term weight outcomes among adults with overweight or obesity. We synthesized evidence from randomized controlled trials of behavioral interventions versus control or alternative
Katharina Preuhs, Iris Eekhout, Rosa Andree, Hilde van Keulen, Pepijn van Empelen   +4 more
wiley   +1 more source

Coordinating representation registers: linear algebra students' understanding of orthogonal Legendre polynomials in the inner product space ℙn in a technology-assisted learning environment

Annales de Didactique et de Sciences Cognitives, 2018
The purpose of this research study was to understand how linear algebra students in a university in the United States make sense of the orthogonal Legendre polynomials as vectors of the inner product space ℙn in a DGS (Dynamic Geometry Software)-MATLAB ...
Günhan Caglayan
doaj   +1 more source

Lack of Hydraulic Acclimation in Response to Multiple Droughts and Recovery

Plant, Cell &Environment, Volume 49, Issue 9, Page 6931-6943, September 2026.
ABSTRACT Human‐caused climate change is expected to bring more frequent and extended droughts with shorter wet periods of relief in between for many regions of the world. Critical knowledge gaps remain around the extent to which tree species can acclimate physiologically to repeated droughts.
Jaycie C. Fickle, Kelly L. Kerr, Lillie I. Congram, Cedric Zahnd, William R. L. Anderegg   +4 more
wiley   +1 more source

Fault Classification in Power Transformers Using Dissolved Gas Analysis and Optimized Machine Learning Algorithms

Machines
Power transformers are critical assets in electrical power systems, yet their fault diagnosis often relies on conventional dissolved gas analysis (DGA) methods such as the Duval Pentagon and Triangle, Key Gas, and Rogers Ratio methods.
Vuyani M. N. Dladla, Bonginkosi A. Thango   +1 more
doaj   +1 more source

Teleseismic S‐Wave Coda Autocorrelation and vp/vs ${v}_{p}/{v}_{s}$ Distribution Over the Antarctic Ice Sheet

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 8, August 2026.
Abstract Accurate characterization of the compressional to shear (P‐to‐S) wave‐speed ratio (vp/vs ${v}_{p}/{v}_{s}$) within the Antarctic Ice Sheet (AIS) is crucial for understanding its internal structure, mechanical stability, and vulnerability to a changing climate.
Ammu Sanjayan, Thanh‐Son Phạm, Hrvoje Tkalčić   +2 more
wiley   +1 more source