This study examines how Augmented Reality (AR) visualizations can impact the collective interaction of users. This research will focus on a multiphase experience with a buildup of different levels of Virtual Reality through the use of panoramas and 3D models. The experience was created using a participatory method with multiple tests and iterations to better create an evaluable product. The result if this experiment shows that the impact AR has on users is extensive. A properly framed character can even change a pair of two users into a group of three.

Mitigation of health and heat-build-up issues related to black, granulated crumb rubber infill (GCRI) in synthetic turf fields (STF) while maintaining acceptable impact absorption properties was the central goal of this study. The first step was establishing a STF baseline performance of GCRI samples that originated from several sources while elucidating the synergistic parameters between infill and turf that promulgate acceptable impact performance. Based on the knowledge base built on the GCRI-STF standard, three polymeric waste streams selected for their benign chemical contents, non-black colors and competitive low costs were evaluated as alternate turf infill materials: post-consumer carpet broadloom (PCCB), post-consumer carpet tile (PCCT) and recycled polyethylene terephthalate (PET) drink bottles. For ground PCCB carcass (the base on the carpet construction remaining after the face fibers were removed), the heterogeneous composition of unconfined fine particles and remaining short fibers prevented sufficient material integration to allow sufficient impact energy absorption. The ground PET homogeneous particles alone lacked sufficient impact absorption capabilities, and their synergistic interactions with the turf blade yarns were not sufficient to meet specified levels of impact performance. Only the PCCT infill crumb possessed a heterogeneous structure that effectively filled the STF to yield sufficient impact cushioning comparable to standard GCRI. In conclusion, PCCT was shown to be a technically-viable candidate for GCRI infill replacement, warranting further development to bring it into closer cost competitiveness to GCRI and ensure long-term wear and weathering performance in synthetic turf.

published_or_final_version / Environmental Management / Master / Master of Science in Environmental Management

No description available.

No description available.

No description available.

No description available.

The source of potassium and argon in ordinary chondrites is determined by comparing the argon activation energies of feldspar, pyroxene, and olivine with that of the L chondrites Chico and North West Africa (NWA) 091. In addition, shock pressures of 29 to 55.8 GPa are shown to lower the activation energy of feldspar. Comparable shock pressures lowers the activation energy of pyroxene outside of error, but the variability of this value, even among unshocked samples, makes a clear distinction difficult. The effect of shock on olivine has not been investigated, by myself or others. Like many ordinary chondrites, Chico and NWA 091 have two major releases of argon, one at low temperature, and the other at high temperature. The low temperature release of Chico contains two releases, which match the activation energies of shocked and unshocked feldspar. The low temperature release of NWA 091 only contains a single release, which matches shocked feldspar. The high temperature release of both Chico and NWA 091 has an activation energy that is similar to pyroxene, but not olivine. A potassium mass balance of Chico shows that all the potassium in the meteorite is contained in feldspar, and Raman spectroscopy shows this feldspar has not been converted into a high pressure phase, indicating the high temperature release is inclusions in a high temperature mineral. This mineral is probably pyroxene based upon the activation energy, though thin sections provide evidence that feldspar is more closely associated with olivine. NWA 091 exhibits multiple isochrons, showing the presence of two nonprimordial and (probably) non-terrestrial trapped components of argon. The removal of these trapped components reveals a thermal event produced by a collisional impact on the L chondrite parent body at 475 ± 6 Ma (which supports a link between L chondrites and Ordovician fossil meteorites), as well as a similar event at ~800 Ma (which, combined with similar ages on other Solar System objects, suggests an increased impact flux at that time). Chico did not exhibit an isochron, and the age data for Chico is not reported.

20 pp.

The transient dynamic analysis of constrained mechanical systems may require the solution of a mixed set of algebraic and differential equations of motion. The usual formulation of these equations is expressed in terms of the accelerations of the system components. A canonical form of the equations of motion in terms of the system velocities and the time derivative of the system momenta may be used instead. This is a natural form of the equations in which all the state variables are explicitly expressed, and have the same physical importance. The numerical solution obtained from the canonical equations shows more accuracy and stability, specifically for systems with large and fluctuating forces. For the mechanical systems that undergo an impact, the usual numerical solution of the equations of motion is not valid. Two different methods of analysis of impact problems are presented. In one method, the variations of the impulsive force during the contact period are directly added to the vector of forces in the canonical equations of motion. In the second method, based on the assumption of instantaneous nature of impact, a set of momentum balance-impulse equations is derived by explicitly integrating the canonical equations. These equations are solved at the time of impact for the jump in the system momenta right after impact. Necessary parameters are evaluated for the performance of the two methods of analysis. These parameters include the maximum relative indentation, the maximum contact force, and the coefficient of restitution. The parameters are determined for the collision between two bodies in a system with any general geometric or material properties. The influence of friction modeling in the magnitude and the direction of the total force at the contact surfaces is discussed. The dynamics of a vehicle collision is studied in order to illustrate the efficiency of obtaining a solution to the canonical equations, the simplicity of solving the momentum balance-impulse equations.