Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 96 for “"digging"”.
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A nondimensional model for axial digging in granular materials
… depth and estimate the thickness that minimizes digging energy. A stochastic algorithm is proposed to model the digger's axial force as a function of depth, taking into account the force distribution at each depth. We then calculate the energy required for a digger of each thickness to reach a …
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Autonomous Loading of Fragmented Rock: Admittance Control for Robotic Digging
An admittance-based controller for autonomously digging in fragmented rock piles was developed and tested by using a 1 t surface loader, and a 14 t Atlas Copco Load-Haul-Dump (LHD) vehicle. This admittance-based Autonomous Loading Controller (ALC) had superior consistency over both digging at …
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Digging Deep Into Urban Mobility Data Through Machine Learning Techniques
L'abstract è presente nell'allegato / the abstract is in the attachment
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Digging for Growth? Which infrastructure development should African countries prioritise?
This study investigates the impact of infrastructure development on economic growth among 10 selected African countries over a period of 15 years from 2000 – 2015. The study uses panel data to analyse the effect of infrastructure components on economic growth. The findings show that infrastructure …
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Digging deeper: Enriching transition to adult life outcome research through life-histories
1 PDF file (v, 293 pages)
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Parameters that affect the digging of a biologically-inspired underwater borrowing robot
… velocity were all found to correlate with faster digging speed. Future work will involve experimentally determining the minimum fluidizing velocity and the effect of contraction speed on digging ability.
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Digging Deeper than Platinum: South Africa's Participation in an Emergent Fuel Cell Industry
South’s Africa’s position as global platinum supplier provides a unique opportunity for an emergent fuel cell industry. The innovative technology’s reliance on platinum has sparked interest in the mining sector, promoting the clean energy-producing devices in their own operations. This research …
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The Application of Computer Modelling to the Design Optimisation of a Microexcavator Digging
… be considered for the design of microexcavator digging arm and hydraulic system has been undertaken.<br/><br/>Fundamental mechanics and structural theories have been used to develop a structural model of the Powerfab 360WT microexcavator digging arm under static or Quasi-Static loading …
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An Investigation of Diggability and Other Digging Effort Related Metrics for Cable Shovels at Multiple Mines
… open-pit mines for the purposes of quantifying digging effort. A comparative analysis of public domain diggability metrics was conducted to look at the influence of rock types, fragmentation distribution, blasting practices, excavator capabilities and other factors on calculated values. Results …
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Development of a Virtual Reality Excavator Simulator: a Mathematical Model of Excavator Digging and a Calculation Methodology
… by proposing a mathematical model of excavator digging and a calculation methodology. The mathematical model of excavator digging provides physically meaningful soil-bucket interaction information to a simulator. The calculation methodology provides systematic and efficient computation methods …
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Digging deeper : a case study on Hispanic male students' post-secondary plans in a rural Texas high school.
The academic achievement gap between Hispanic males and other demographic groups is not a new problem. Historically, due to years of marginalization, language barriers, and suppression, Hispanic males underperform academically compared to their demographic counterparts. While more Hispanic males …
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An investigation of the critical timescales needed for digging in wet and dry soil using a biomimetic burrowing robot
… its valves to fluidize the surrounding soil. Its digging method uses an order of magnitude less energy than would be needed to push the clam directly into soil, which could be useful in engineering applications such as anchoring and sensor placement. The first chapter of this thesis presents the …
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Digging the dirt: a comparative analysis of excavation methods and recording systems in relation to their applications in forensic archaeology.
Archaeological excavation has been widely used in the recovery of human remains and other evidence in the service of legal cases for many years. However, established approaches will in future be subject to closer scrutiny following the announcement by the Law Commission in 2011 that expert evidence …
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ΠΑΡΑΜΕΤΡΟΙ ΠΟΥ ΕΠΗΡΕΑΖΟΥΝ ΤΗΝ ΕΞΟΡΥΞΙΜΟΤΗΤΑ ΤΩΝ ΠΕΤΡΩΜΑΤΩΝ ΜΕ ΚΑΔΟΦΟΡΟ ΕΚΣΚΑΦΕΑ
… OF THE BUCKET WHEEL EXCAVATOR AND THE SPECIFIC DIGGING ENERGY OF THE ROCK MASS. THE PROPOSED CRITERION IS FORMULATED BY USING THE SIMULATORBWDIG, WHICH SIMULATES THE DIGGING OPERATION OF A STANDARD BUCKET WHEEL EXCAVATOR WITH A CROWDLESS-TYPE BUCKET WHEEL BOOM, EXCAVATING ACCORDING TO THE FULL …
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Digging Below the Demographic Level: Examining the Effects of Internalized Racial and Social Attitudes on White Physicians-In-Training Self-Reported Cross Cultural Competency
<p>The racial and social attitudes of White physicians-in-training were explored in relation to aspects of self-perceived cross cultural competence. Specifically, internal motivation to respond without prejudice, ethnocultural empathy, color-blind racial attitudes, and general just world beliefs …
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Digging deeper for benefits: rural local governance and the livelihood and sustainability outcomes of devils claw (Harpagophytum spp.) harvesting in the Zambezi Region, Namibia
Natural resource governance in Africa is characterised by increased commercialisation of natural resources, the promotion of community-based natural resource management, and a re-appropriation of traditional authorities and customary law as evidenced by their inclusion in statutory frameworks. Yet, …
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The design of scaled robotic end effectors to mimic razor clam burrowing
… scaled mechanical end effectors that mimic the digging of Ensis directus, the Atlantic Razor Clam. Modeled after a 0.5x Ensis scale device, the end effectors are 1.0x and 2.0x Ensis scale. The end effectors will be coupled to a pneumatic robotic actuator to explore the nondimensional …
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Transport in granular systems
… with flexible boundaries. This thesis focuses on digging in granular materials. Pinto bean plant roots were used as a model biological system, and experiments using photoelastic grains were performed to quantify the effect of the inhomogeneous forces in the substrate on the root growth. It was …
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