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 41 for “"shape factor"”.
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Transient Shape Factors for Thermal Flow Simulation in Fractured Reservoirs
… and surrounded fractures, which is modeled via a shape factor. The main focuses of this dissertation are the characterization and understanding as to how shape factors are utilized for modeling non-isothermal, fracture-matrix fluid exchange in fractured reservoirs. The intention of this research, …
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Net Impulse and Net Impulse Characteristics in Vertical Jumping
… height and width, rate of force development, shape factor, and net impulse proportion. The following were then examined: 1) test-retest reliability of a new approach to identify net impulse in a force-time curve and of net impulse characteristics and criterion validity of the new approach; 2) …
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The characterization of particle clouds using optical imaging techniques
… techniques to characterize parameters such as shape factor and entrainment coefficient which govern the initial descent phase of particle clouds in water. Several different aspects of optical imaging are considered and evaluated such as the illumination, camera, and data acquisition components. …
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Strain Rate and Temperature Controls on Strain Heterogeneity: Its Significance for Deformational Concepts
… evaluate the important analytical techniques of shape factor analysis and the use of strain heterogeneity to establish a path of progressive deformation.
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An experimental investigation of heat transfer through insulation uniformly applied to a flat end cylinder
… comparison with the dimensions of the enclosure. Shape factors have been applied to this basic equation so the equation may be used in the determination of heat transfer where the area A is not constant and the effect of corners can not be neglected. The equation then becomes Q= …
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Determination of streamflow characteristics for ungaged Texas streams using regression analysis
… drainage area, channel length and slope, basin shape factor, precipitation, and hydrologic soil group. The harmonic mean regression equation included slope, precipitation, and area and had a higher adjusted R$\sp2$ than the 7Q2 and 7Q10 equations. Gamma 7Q2 and 7Q10 estimates yielded more …
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Numerical and experimental investigation of VG flow control for a low-boom inlet
… parameters included incompressible axisymmetric shape factor, post-shock separation area, inlet pressure recovery, and mass flow ratio. The design of experiments (DOE) methodology was used to select device size and location, analyze the resulting data, and determine the optimal choice of device …
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Probing metal nanoparticles and assemblies with analytical ultracentrifugation
… tool to obtain statistically relevant size and shape measurements for macromolecular systems. Metal nanoparticles coated by a ligand shell of thiolated molecules provide diverse functionality, from targeted cellular delivery to the formation of complex assemblies. Here I show that AUC can be …
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Improvement and validation of a thermodynamic S.I. engine simulation code
… were generated using a central ignition, disc-shaped combustion chamber variant of a ported single-cylinder research engine with full-bore overhead optical access. These data included simultaneous measurement of cylinder pressure and flame position at different operating conditions. The engine …
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Prediction of in-situ asphalt mixture density using ground penetrating radar: theoretical development and field verification
… improve the density prediction accuracy, a shape factor was introduced into the modified Bottcher model. Nonlinear least square curve fitting of the field core data indicated that a shape factor of -0.3 provided the best-performance model, which is referred to as the Al-Qadi Lahouar Leng …
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Machine Learning Approaches to Data-Driven Transition Modeling
… even for those where physically defined shape factor parameters cannot be defined/determined in a consistent manner. Furthermore, sequence-to-sequence mapping is used to predict the transition location based on the mean boundary layer profiles. Such an end-to-end transition model provides …
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Characterization of aerosols in an underground mine
… strategies. Changes in fractal dimension, shape factor and primary particle diameter were observed for examined control strategies as well as light duty and heavy duty engines. Samples collected from uncontrolled zone showed higher fractal dimension of chain-like agglomerates. Volatile …
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Physical and radiative properties of coated nanoparticle aggregates
… after a critical coating fraction. The dynamic shape factor, critical for particle transport, is also investigated. For coagulated BC, its non-monotonic evolution is driven by the attached structure morphology, while for condensed BC the shape factor decreases to one at spherical encapsulation. …
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Morphological and mechanical analysis of the porous structure of cortical bone
… strain increased significantly with area, shape factor, and clustering, however,these relationships were not strong. Discussion: Studying the microstructure of cortical bone is useful for identifying the exact location of bone growth and repair based on mechanical stimulus. Relating …
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The effects of micro-vortex generators on normal shock wave/boundary layer interactions
… the boundary-layer incompressible shape factor/skin friction coefficient) through a SWBLI, increasing pressure recovery, and reducing flow distortion at the aerodynamic interface plane while adding minimal drag to the system. The investigation encompasses experiments in both …
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Active Flow Control of Subsonic Flow in an Adverse Pressure Gradient Using Synthetic Jets and Passive Micro Flow Control Devices
… of boundary layer flow.</p><p>The boundary layer shape factor is used as a figure of merit for determining the boundary layer flow quality/modification and its tendency towards separation. It is found by a large number of numerical experiments and the analysis of simulation data that a flow …
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Solids mixing and segregation in a gas spout-fluid bed-effect of the distributor design
… and different density flotsam-rich systems. The shape factor does not seem to have an affect as long as it is only restricted to the minor component. However, in the case of the major component, particle shape significantly affects the final results. Studies of aspect ratio showed that there is a …
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Mechanistic-Empirical Evaluation of the Mn/ROAD Low-Volume Road Test Sections
… that Area Under Pavement Profile (geometric shape factor of deflection basin) can be used to predict the strains at the bottom of AC layer. The 'Design Time' concept was utilized to consider temperature effects on AC fatigue computations. The analyses showed that the 'Design Time' is …
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On gravity-driven flow
… downstream gradient Richardson number, and a shape factor φ. These solutions lead to global constraints on the entrainment flux and energy dissipation of transitioning currents. In the third problem we present a series of new numerical simulations on two- dimensional gravity currents …
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Influence of site, clone, age, and growth rate on wood properties of three Populus X Euramericana clones
… including vessel lumen diameter, area and shape factor, number of vessels per unit area, fiber lumen diameter and area, fiber length, ray area, and cell wall area percent were measured by an image analyzer. Site, clone and/or their interaction significantly affected one or more of these …
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