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Assessment of equipment performance variables for improved management during tillage operationsKichler, Corey Mitchell, Zech, Wesley C., January 2008 (has links) (PDF)
Thesis (M.S.)--Auburn University, 2008. / Abstract. Vita. Includes bibliographical references (p. 115-122).
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Optimising the performance of an oscillatory subsoiler /Shahgholy, Gholamhossein. Unknown Date (has links)
Thesis (PhD)--University of South Australia, 2007.
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Contour Ripping and Composted Dairy Manure for Erosion Control on Fort Hood Military Installation, TexasPrcin, Lisa J. 2009 May 1900 (has links)
Training activities on the Fort Hood Military Installation have imposed serious impacts to its grass-dominated landscape. Six decades of tracked vehicle impacts have caused soil compaction and vegetation reduction which has lead to severe surface erosion. This investigation examined two conservation practices directed at improving and creating sustainable training conditions on Fort Hood training lands, contour ripping and the application of composted dairy manure. The application of composted dairy manure may increase vegetation, while contour ripping may decrease discharge, both of which will lead to a decrease in erosion.
Three small 0.30 ha watersheds were established on Fort Hood in January 2005. Each watershed had 0.46 m berms installed on all four sides with a 0.305 m H-flume and was equipped with automated storm sampling equipment. Soil samples were collected prior to any treatments, and twice after compost applications. Discharge and precipitation was collected continuously on each watershed. Stormwater samples were collected during storm events and analyzed for water quality parameters. Water quality samples, discharge and precipitation records were collected between January 2005 and July 2007. Three composted dairy manure application rates at 0, 28 and 57 m3 ha-1 were applied on watersheds C0, C1 and C2, respectively; watersheds were evaluated for effects on NO3 and soluble reactive phosphates (SRP) concentrations and loadings in storm events and on stormwater discharge. Twenty two months after the initial compost application, the two previously composted watersheds (C1 and C2) were treated with contour ripping and C2 received a second compost application. The compost application caused the spikes in NO3 and SRP concentrations and loads immediately after application. Both NO3 and SRP concentrations decreased as the number of days from application increased. Compost application did not appear to have an effect on the discharge from watersheds. Contour ripping had a significant effect on stormwater discharge. Contour ripping decreased discharge by 74 and 80% on C1 and C2, respectively when compared to the untreated control (C0).
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Discrete element modeling of a vibratory subsoiler /Van der Linde, Jaco. January 2007 (has links)
Thesis (MScIng)--University of Stellenbosch, 2007. / Bibliography. Also available via the Internet.
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Force modelling and energy optimization ofor subsoilers in tandemKasisira, Levi Lukoda. January 2004 (has links)
Thesis (Ph.D.)(Civil Engineering)--University of Pretoria, 2005. / Includes summary. Includes bibliographical references.
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Tearable ClothPhillips, Kurt T. 16 January 2010 (has links)
This document proposes modifications to an established cloth simulation algorithm to
allow for stretch deformation and tearing of simulated cloth in computer-generated
imagery. Previous research is presented, followed by the development of a cloth
simulation system with the addition of tearing behavior. Several results are given that
show off individual features and behaviors that this thesis models.
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Discrete element modeling of a vibratory subsoilerVan der Linde, Jaco 12 1900 (has links)
Thesis (MScEng (Mechanical and Mechatronic Engineering))--University of Stellenbosch, 2007. / Vibrating a tillage tool is an effective way of reducing the draft force required
to pull it through the soil. The degree of draft force reduction is dependent on the
combination of operating parameters and soil conditions. It is thus necessary to
optimize the vibratory implement for different conditions.
Numerical modelling is more flexible than experimental testing and analytical
models, and less costly than experimental testing. The Discrete Element Method
(DEM) was specifically developed for granular materials such as soils and can be
used to model a vibrating tillage tool for its design and optimization. The goal
was thus to evaluate the ability of DEM to model a vibratory subsoiler and to
investigate the cause of the draft force reduction.
The DEM model was evaluated against data obtained from field testing done
with a full scale single tine vibratory subsoiler. Soil testing was also done for
material characterization and for the calibration of DEM material properties.
The subsoiler was simulated using a commercial code, PFC3D. The effect on
the simulation results of particle diameter, different bonding models and damping
models was investigated. The final simulations were evaluated against the experimental
results in terms of the draft force and material behaviour. The cause of
the draft force reduction due to vibration was also investigated with the aid of the
DEM model.
From the results it was concluded that DEM is able to model the vibratory
subsoiler for its design and optimization. The DEM model also provided valuable
insight into the cause of the draft force reduction such as the increased peak stresses
due to vibration and the increase in particle kinetic energy.
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The Effects of Two Types of Reclamation on Abandoned Non-Coal Surface Mines in Cuyahoga Valley National Park, OhioRuhm, Catherine Terese 04 December 2018 (has links)
No description available.
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Working Backwards: Enhancing Forest Restoration by Reversing Effects of Surface Mine Reclamation on Soil Bulk Density and Soil ChemistryBack, Michael Patrick 18 May 2021 (has links)
No description available.
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