Results 51 to 60 of about 650 (181)

A Comprehensive Characteristic Modeling Method for Francis Turbine Based on Image Digitization and RBF Neural Network

Energies
Establishing a mathematical model of a Francis turbine is the foundation for the simulation of hydropower station operation and is of great significance for the analysis of the hydropower station’s transient process.
Youhan Deng, Youping Li, Xiaojun Hua, Rui Lyu, Yushu Li, Lei Wang, Weiwei Yao, Yifeng Gu, Fangqing Zhang, Jiang Guo   +9 more
doaj   +1 more source

Power Losses in Energy Generation: Mechanisms, Mitigation Strategies, and Pathways to a Sustainable Future

Energy Technology, Volume 14, Issue 4, April 2026.
This article provides a comprehensive review of loss mechanisms in the generation stage of energy systems, covering fossil, nuclear, and renewable technologies. It examines their environmental and operational implications and shows how overlooking generation losses distorts efficiency assessments.
Pooya Parvizi, Alireza Mohammadi Amidi, Mohammad Reza Zangeneh, Jordi‐Roger Riba, Milad Jalilian   +4 more
wiley   +1 more source

Bioclimatic, demographic and anthropogenic correlates of grizzly bear activity patterns in the Greater Yellowstone Ecosystem

Oikos, Volume 2026, Issue 4, April 2026.
Plasticity of diel activity rhythms may be a key element for adaptations of wildlife populations to changing environmental conditions. In the last decades, grizzly bears Ursus arctos in the Greater Yellowstone Ecosystem (GYE) have experienced notable environmental fluctuations, including changes in availability of food sources and severe droughts ...
Aurora Donatelli, Mark A. Haroldson, Justin G. Clapp, Paolo Ciucci, Frank T. van Manen   +4 more
wiley   +1 more source

A Review on Cracking in Laser Additive Manufacturing of Nickel‐Based Superalloys: Types, Formation Mechanisms, and Suppression Strategies

Rare Metals, Volume 45, Issue 4, April 2026.
ABSTRACT Nickel‐based superalloys (Ni‐based superalloys) have attracted extensive attention in laser additive manufacturing (LAM) due to their capability to directly fabricate complex and high‐performance structural components. However, the rapid melting and solidification inherent to LAM result in intense thermal cycling, which induces high residual ...
Tianxiang Lin, Ciying Li, Hongkai Zhou, Rui Chen, Yi Li, Can Cui, Lizhang Zhang, Maoyuan Li, Zhenzhong Wang, Wei‐Wei Xu   +9 more
wiley   +1 more source

Extending the operational range of Francis turbines: A case study of a 200 MW prototype

Energy Conversion and Management: X
Francis turbines are now widely used to support the integration of renewable and intermittent energy sources such as solar and wind power. Consequently, these turbines often operate away from their best efficiency point (BEP).
Michel J. Cervantes, Joel Sundström, Shahab Shiraghaee, Morten Kjeldsen, Erik Jacques Wiborg   +4 more
doaj   +1 more source

Numerical study on unidirectional fluid–solid coupling of Francis turbine runner

Advances in Mechanical Engineering, 2015
To analyze the fluid–solid coupling stress characteristics of the Francis turbine runner comprehensively, based on the Reynolds-averaged Navier–Stokes equations and shear stress transport k-ω turbulence model, this article performs numerical simulation ...
Kan Kan, Yuan Zheng, Xin Zhang, Chunxia Yang, Yuquan Zhang   +4 more
doaj   +1 more source

Estimating golden eagle carrying capacity and wind power impacts through species distribution modeling

Ecosphere, Volume 17, Issue 3, March 2026.
Abstract Knowledge of species' habitat requirements, and the environmental conditions and resources needed for survival and reproduction are key factors in effective conservation management. We used species distribution modeling to study golden eagle (Aquila chrysaetos) habitat requirements.
Pinja Saarinen, Vesa Nivala, Suvi Ponnikas, Anssi Lensu, Hannu Tikkanen   +4 more
wiley   +1 more source

Numerical Simulation of Pressure Pulsations in Francis Turbines

IOP Conference Series: Earth and Environmental Science, 2012
For more than 150 years, hydraulic power plants have been strongly contributing to energy generation. At present, with the expanding participation of other non-storable renewable energy sources in the electrical market composition, water turbines can importantly contribute to the electrical grid stability and to energy storage.
M V Magnoli, R Schilling
openaire   +1 more source

Summertime methane and carbon dioxide emission rates and associated variables from a national‐scale survey of 146 reservoirs in the United States

Limnology and Oceanography Letters, Volume 11, Issue 2, March 2026.
Abstract Reservoirs are globally important sources of greenhouse gases, but the magnitude of their emissions is highly uncertain. Here, we present data for 146 reservoirs from two surveys of reservoir methane and carbon dioxide emissions, one at the regional scale in the midwestern United States and one at the national scale in the United States, plus ...
J. J. Beaulieu, B. R. Deemer, R. M. Pilla, K. J. Forshay, J. W. Hollister, S. A. Jacobs, J. T. Walker, P. T. Leinenbach, N. A. Griffiths, S. D. Shivers, A. O. Tatters, K. N. Buckler, J. W. Corra, R. W. Daly, A. N. Djurkovic, S. R. Fulgham, P. L. Goodwin, L. G. Herger, M. W. Jones, N. J. Jones, L. A. Juilfs, C. M. Langstroth, M. E. Mitchell, J. R. Oliveira, B. M. Richmond, J. W. Schroeder   +25 more
wiley   +1 more source

Francis Turbine Surge: Discussion and Data Base [PDF]

, 1996
A system is considered as stable in sustained operating conditions if the response to unavoidable disturbances does not endanger its safety. Normal disturbances of hydraulic turbines are pressure fluctuations [3, 5, 10], influenced by machine design, operating conditions and by the dynamic response of the water conduits and rotating components.
Jacob, Thierry, Prenat, Jean Eustache
openaire   +2 more sources