Results 51 to 60 of about 37,000 (232)

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

Adjustable speed operation of a hydropower plant associated to an irrigation reservoir [PDF]

, 2008
This paper deals with the issue of adjustable speed operation (ASO) of hydropower plants. The main idea of this technique is to allow the turbine speed to change in accordance with hydraulic conditions, thus improving the overall unit efficiency. General
Bartle, Campos, Farrell, Finardi, José R. Wilhelmi, Juan I. Pérez, Luis Maroto, Mataix   +7 more
core   +2 more sources

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

Flow Modeling in the Wake of a Francis Turbine with Hydraulic Charge: Case of Songloulou-Cameroon [PDF]

Journal of Applied Fluid Mechanics
Cavitation in hydraulic installations is still a major concern when it comes to producing electricity. We are aware of the danger of cavitation and the damage it can cause.
R. D. Wafo, M. Tientcheu-Nsiewe, D. Tcheukam-Toko, B. Kenmeugne, A. Kuitche   +4 more
doaj   +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

Internal flow characteristics in the draft tube of a Francis turbine under different working conditions

Advances in Mechanical Engineering
The Francis turbine stability is impacted significantly by the flow characteristics in its draft tube. In the case of a Francis turbine in a hydropower plant, numerical simulations were undertaken at the maximum and rated heads, respectively, under three
Yuanhang Hou, Xiaobing Liu, Ming Xiao, Haibin Zhang, Yinhui Cai, Yongzhong Zeng, Lei Zou, Jiayang Pang   +7 more
doaj   +1 more source

Influence of 3D Guide Vanes on the Channel Vortices in the Runner of a Francis Turbine

Journal of Fluid Science and Technology, 2006
It is known that the pressure fluctuation in the runner will become large when a Francis turbine operates at the low flow rate and high head. One of the reasons is the occurrence of channel vortices, which are caused by the three-dimensional flow ...
Shuhong LIU, Liang ZHANG, Yulin WU, Xianwu LUO, Michihiro NISHI   +4 more
doaj   +1 more source

Hydro/Battery Hybrid Systems for frequency regulation [PDF]

, 2019
An innovative Hydro/Battery Hybrid System (HBHS), composed of a hydropower plant (HPP) and a Battery Energy Storage System (BESS) is proposed to provide frequency regulation services in the Nordic Power System (NPS).
Laban, Danilo
core   +1 more source

Numerical study on the dynamic behavior of a francis turbine runner model with a crack [PDF]

, 2018
Crack appearance in the blade is the most common type of fatigue damage in Francis turbines. However, it is sometimes difficult to detect cracks in time using the current monitoring system, even when they are very large.
Egusquiza Montagut, Mònica, Valentín Ruiz, David, Valero Ferrando, Ma. del Carmen, Zhang, Ming, Zhao, Weiqiang   +4 more
core   +2 more sources

Careful CO Addition Enhances Autotrophic d‐Lactate Formation With Engineered Acetobacterium woodii

Engineering in Life Sciences, Volume 26, Issue 2, February 2026.
ABSTRACT The acetogen A. woodii efficiently converts CO2 and H2 to acetate. Metabolic engineering enabled the autotrophic production of non‐native products, for example, d‐lactate from CO2 by overexpression of d‐lactate dehydrogenase from Leuconostoc mesenteroides and knockout of the native lactate dehydrogenase. During gas fermentation with acetogens,
Anna Stock, Inka Sotzeck, Kira Baur, Frank Bengelsdorf, Dirk Weuster‐Botz   +4 more
wiley   +1 more source