Prevention of Acidic Groundwater in Lignite Overburden Dumps by the Addition of Alkaline Substances: Pilot-scale Field Experiments

2001 ◽  
Vol 20 (3) ◽  
pp. 122-128 ◽  
Author(s):  
Frank Wisotzky
Keyword(s):  
Field Experiments ◽  
Pilot Scale ◽  
Acidic Groundwater ◽  
Scale Field ◽  
Overburden Dumps

Newly developed membrane contactor-based N and P recovery process: Pilot-scale field experiments and cost analysis

2021 ◽  
Vol 281 ◽  
pp. 125288
Author(s):  
Juho Uzkurt Kaljunen ◽  
Raed A. Al-Juboori ◽  
Anna Mikola ◽  
Ilaria Righetto ◽  
Irene Konola
Keyword(s):  
Cost Analysis ◽  
Field Experiments ◽  
Recovery Process ◽  
Pilot Scale ◽  
Membrane Contactor ◽  
Scale Field ◽  
P Recovery

Dynamics of an Array of Submersible Mussel Rafts in Waves and Current

2019 ◽  
Author(s):  
Tobias Dewhurst ◽  
Spencer T. Hallowell ◽  
Carter Newell
Keyword(s):  
Field Experiments ◽  
Natural Frequencies ◽  
Dynamic Loads ◽  
Full System ◽  
Mooring Lines ◽  
Element Analysis ◽  
Commercial Code ◽  
Scale Field ◽  
Waves And Currents ◽  
Corner Node

Abstract A three-by-three grid of submersible mussel rafts was analyzed using an experimentally validated dynamic numerical modeling approach. When submerged, the rafts’ pontoons are flooded, and they are held vertically by lines attached to surface floats and horizontally by a mooring grid. The rafts’ decreased waterplane area and increased inertia reduce the heave and pitch natural frequencies so that they are below the frequencies associated with the greatest wave energy. This has been found to significantly reduce the motion of the rafts compared to the surfaced configuration. The nine submersible rafts were anchored with 16 anchors and mooring lines. These mooring lines were connected to a grid of adjacent rectangular bays, with each corner (node) supported by a grid float. Each bay contains a raft connected to the submerged nodes of the grid by four bridle lines. The dynamics of the full system were modeled using a combined multibody and Finite Element Analysis (FEA) approach with dynamic loads computed using a modified Morison formulation. This model was implemented in the commercial code OrcaFlex. A similar model for a single submersible raft was previously validated with full-scale field experiments. The full dynamic system was simulated in the maximum expected waves and currents. Mean and maximum tensions in each grid line were quantified. Accelerations and velocities at the mussel rope attachment points were also examined, since these relate to mussel drop-off.

Nudging organizations: evidence from three large-scale field experiments

2019 ◽  
Author(s):  
Paul Ferraro ◽  
James Fan ◽  
Kent Messer ◽  
Collin Weigel
Keyword(s):  
Large Scale ◽  
Field Experiments ◽  
Scale Field ◽  
Large Scale Field
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