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.
Results
Showing 1 to 17 of 17 for “"cleat"”.
-
Nature and origin of minerals in anthracite from eastern Pennsylvania
… coal beds (termed systematic and non-systematic cleat), a third joint set (J$\sb3)$ which is systematic and permeates adjacent lithologies, and slip surfaces. Systematic and non-systematic cleat sets, and kaolinite within the cleat sets, formed during bituminization. All other authigenic clay …
-
Scanning Methods as Monitoring, Verification, and Accounting tools for CO₂ Sequestration in Unconventional Gas Reservoirs
… detection, and desorption analysis coupled with cleat image analysis. Analyses of coals performed by both environmental scanning electron microscope (ESEM) and micro CT demonstrate that distributions of cleat porosity in coals are anisotropic and not correlated to the seam depth or location. ESEM …
-
The effects of fault-induced stress anisotropy on fracturing, folding and sill emplacement: Insights from the Bowie coal mines, southern Piceance basin, western Colorado.
… fault that perturbed the stress field during cleat (fracture) formation, rotating cleat orientations up to 500 m on both sides of the fault. Two unusual fracture types are found only in coal adjacent to the fault: (1) concentric cleats, highly curved fractures that form blocks resembling balls …
-
Geomechanical behaviour and deformation of coal mine roof strata around faults: toward an engineering geological model
… field and local-scale measurements of joint and cleat at two sites. Results indicate that a range of faulting styles including normal and reverse faulting are prevalent across the mine, with the dominant discontinuities in the target Leichhardt coal seam limited to butt and face cleat, in …
-
Testing Soccer Cleats Designed to Reduce ACL Tears
… provides an opportunity for engineers to design cleats to reduce the risk of these injuries. The company HBN shoes designed a soccer cleat aimed at reducing ACL tears by increasing the flexibility of the cleat around the metatarsophalangeal joint. The idea behind this is that increased …
-
Enhancement of a Rolling Resistance Rig for Force and Moment Testing of Tires
… to make it capable of force and moment and cleat testing along with the standard rolling resistance test. Additionally, the design of a mechanical loading mechanism (used to apply normal force on the tire) in place of the previous one using dead weights is also discussed. This study also …
-
Modelling and analysis of a non-pneumatic tire-road interaction using finite element method
… static footprint, vertical stiffness, and drum-cleat analyses. Tire-road interaction characteristics such as tractive effort, rolling resistance coefficient, lateral force, and energy dissipation were evaluated under various operating conditions, including longitudinal speed, vertical load, and …
-
ESTIMATION OF DIFFERENT COAL COMPRESSIBILITIES OF COALBED METHANE RESERVOIRS UNDER REPLICATED IN SITU CONDITION
… to predict the permeability trend with constant cleat compressibility although the values used for the two models were different. Finally, the coupled strain and permeability models were employed to validate the field observed permeability increase data. The results indicated that the coupled …
-
Strength of beam-columns in flexibly connected steel frames.
… connections. In frames incorporating flange cleat connections the beams and columns can sustain greater loading and deflect less than is predicted by current design models. The assumptions of pin-ended columns and simply supported beams are shown to be conservative. Comparisons of the results …
-
Turning and Turbulence: A Comparative Study of Agility and Fluid Mechanics in Men’s and Women’s Soccer
… injury hypotheses and informing gender-specific cleat design considerations. Beyond individual movement, this study also examines collective team behavior through a fluid mechanics lens. No significant gender differences were found in power spectral densities or second-order structure functions, …
-
Double Angle Framing Connections Subjected to Shear and Tension
… angle connection (sometimes referred to as a cleat connection) is one of the most commonly used simple shear connections, and many investigations have been conducted on this type of connection. However, most of these investigations have focused on either the strength or the moment-rotation …
-
Operational Modal Analysis of Rolling Tire: A Tire Cavity Accelerometer Mediated Approach
… two optical sensors in a tire on drum setup with cleat excitation to characterize dynamics of tread vibration in an appreciably easier, time and cost-effective approach. In this approach, First, the TCA vibration signal in a single test run is clustered into several groups representing an array of …
-
Enhancement of the Sliding Hinge Joint Connection with Belleville Springs
… Sliding Hinge Joint with an abrasion resistant cleat. • Investigating the behaviour of the Sliding Hinge Joint with abrasion resistant cleat and shims. • The AFC component tests on the MTS machine to establish the optimum level of installed bolt tension. • The SHJAFC component tests using …
-
Development of a multi-physics tire model for wear and thermal estimation in the finite element environment
… vertical stiffness at different loads, drum cleat test, and rolling resistance test were all performed and compared to experimental datasets. In this research, a dynamic evaluation of tire wear is investigated. A controlled acceleration-deceleration cycle experiment is performed at the …
-
The chemical characterisation of authigenic carbonates from the Witbank no. 2 coal seam : environmental and diagenetic implications
… formed spberulites, 3) massive carbonates, 4) cleat-filling carbonate, 5) fracture-filling carbonates and 6) carbonate cement of associated sands. The textural relationships, depth of burial and chemical evolution of these carbonates were studied with the aid of X-ray diffraction, total organic …
-
PRELIMINARY EXPERIMENTAL AND MODELING STUDY OF PRESSURE DEPENDENT PERMEABILITY FOR INDONESIAN COALBED METHANE RESERVOIRS
… changes with variations in pressure, the cleat compressibility for the two coal types was estimated. In a separate effort, volumetric strain as a result of desorption of gases was measured using sister samples under unconstrained condition, in absence of the stress effect. Sorptioninduced …
-
LABORATORY INVESTIGATION OF COAL PERMEABILITY UNDER REPLICATED IN SITU STRESS REGIME
The cleat permeability of coal, a key to the success of any coalbed methane (CBM) recovery operation, is a dynamic parameter impacted by changes in effective stress and desorption-induced "matrix shrinkage". Most commonly-used theoretical models developed to predict CBM production as a result of …