Results 21 to 30 of about 632 (187)

From dusk till dawn: ecoacoustic monitoring reveals wind energy impacts on roding Eurasian woodcock Scolopax rusticola

Wildlife Biology, EarlyView.
Renewable energy is vital for reducing carbon emissions and yet its infrastructure poses challenges to biodiversity. While the impacts of wind power on bats and raptors are well‐studied, the effects on elusive species remain largely unknown. The Eurasian woodcock Scolopax rusticola, a nocturnal forest bird, performs characteristic courtship flights at ...
Jan O. Engler, Michael Bokämper, Stefan Hannabach, Manuela Merling de Chapa, Lena Daum, Kostadin B. Georgiev, Simon Thorn   +6 more
wiley   +1 more source

Mergers and Acquisitions as Navigators of Climate Policy Shocks: Evidence from the NOx Budget Trading Program

Financial Management, EarlyView.
ABSTRACT We examine how mergers and acquisitions (M&As) enable firms to adapt to climate policy shocks. Exploiting the adoption of the Nitrogen Oxides (NOx) Budget Trading Program (NBP) across US states as an exogenous shock, we find that firms with NOx‐emitting plants subject to the NBP are more likely to engage in M&As, particularly through vertical ...
Samer Adra, Yang Gao, Malika Hamadi, Jiayi Yuan   +3 more
wiley   +1 more source

Correlating Sediment Erosion in Rotary–Stationary Gaps of Francis Turbines with Complex Flow Patterns

Energies
Secondary flows in Francis turbines are induced by the presence of a gap between guide vanes and top–bottom covers and rotating–stationary geometries. The secondary flow developed in the clearance gap of guide vanes induces a leakage vortex that travels ...
Nirmal Acharya, Saroj Gautam, Sailesh Chitrakar, Igor Iliev, Ole Gunnar Dahlhaug   +4 more
doaj   +1 more source

Do not be Afraid of Small High-Speed Francis Turbines

Journal of Mechanical Engineering, 2018
In the first quarter of the last century hydraulic power plants were equipped with high-speed Francis turbines even in the situation when a contemporary project manager would suggest Kaplan turbine. The reason is simple. Mr.
Libor Koudelka
doaj   +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

Flow-Induced Strength Analysis of Large Francis Turbine Under Extended Load Range

Applied Sciences
To meet the load requirements of the power grid, the hydroelectric power plants need to extend the operational load range of the turbine units, which are often operated under off-design operating conditions.
Xingping Liu, Xingxing Huang, Weijiang Chen, Zhengwei Wang   +3 more
doaj   +1 more source

The Dynamic Characteristics and Control of a Hydraulic Turbine

Measurement + Control, 1969
A dynamic model of a radial flow turbine was derived. The model was verified by tests on an experimental 5 hp Francis type turbine. The tests indicate that the model is adequate for control system design.
I. Djordjevic Dipl.Ing, F. J. Charlwood MSc, BSc (Eng), L. Finkelstein MSc, CEng, MIEE, AInstP, M. W. C. Houston MSc.   +3 more
doaj   +1 more source

Functional Materials for Environmental Energy Harvesting in Smart Agriculture via Triboelectric Nanogenerators

Advanced Functional Materials, Volume 36, Issue 13, 12 February 2026.
This review explores functional and responsive materials for triboelectric nanogenerators (TENGs) in sustainable smart agriculture. It examines how particulate contamination and dirt affect charge transfer and efficiency. Environmental challenges and strategies to enhance durability and responsiveness are outlined, including active functional layers ...
Rafael R. A. Silva, Giulio Fatti, Emanuel Carlos, Guilherme Ferreira, Sumita Goswami, Suman Nandy, Luiz H. C. Mattoso, Elvira Fortunato, Caio G. Otoni, Rodrigo Martins   +9 more
wiley   +1 more source

Advanced Ceramics in Aerospace and Defense: The Interrelationship between Traditional and Additive Manufacturing Approaches

Advanced Materials Technologies, Volume 11, Issue 3, 5 February 2026.
Additive manufacturing revolutionizes production by enabling on‐demand, customized, and sustainable manufacturing with streamlined supply chains. While metal and polymer AM are well‐established, advanced ceramic AM is rapidly emerging, overcoming traditional material challenges.
Kateryna Oleksandrivna Shvydyuk, Senentxu Lanceros‐Mendez, Abílio Pereira Silva   +2 more
wiley   +1 more source

Influence of tungsten carbide spray treatment on anti-wear performance of Francis turbine runner blades surface

Advances in Mechanical Engineering
Based on the velocity similarity theory, a test system for sediment wear flow around Francis turbine runner blades was established. The sediment wear test was carried out on the surface of Francis turbine runner blades with severe sediment wear before ...
Bing Yao, Yuanyuan Gang, Ming Xiao, Zhishun Yu, Dengyun Jiang, Jiayang Pang, Xiaobing Liu   +6 more
doaj   +1 more source