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Item Nuclear magnetic resonance measurement of hydrodynamic dispersion in porous media: Preasymptotic dynamics, structure and nonequilibrium statistical mechanics(2012-10) Codd, Sarah L.; Seymour, Joseph D.Measurement of displacement time and length scale dependent dynamics by pulsed gradient spin echo nuclear magnetic resonance in porous media directly provides the preasymptotic hydrodynamic dispersion coefficient. This allows for comparison with nonequilibrium statistical mechanics models of hydrodynamics dispersion in porous media. Preasymptotic dispersion data and models provide characterization of porous media structure length scales relevant to transport and are related to the permeability and sample heterogeneity.Item Natural convection heat transfer between a body and its spherical enclosure(Montana State University - Bozeman, College of Engineering, 1971) Weber, NormanItem Cooling by night radiation from water with evaporation and convection(Montana State University - Bozeman, College of Engineering, 1970) Cunniff, Gregory NixonItem The forced vibration of viscus damped, N-beam structures(Montana State University - Bozeman, College of Engineering, 1970) Prill, Daniel FranklinItem A study of arterial blood noises (cervical bruits)(Montana State University - Bozeman, College of Engineering, 1969) Bowers, Joel MorrisItem The radial pressure gradient for turbulent flow in smooth pipes(Montana State University - Bozeman, College of Engineering, 1971) Greene, Charles WillisItem Natural convective flow between isothermal concentric spheres(Montana State University - Bozeman, College of Engineering, 1972) Yin, Shiu-hauItem Turbulence structure in smooth and rough pipes(Montana State University - Bozeman, College of Engineering, 1970) Powe, Ralph EdwardItem The maximum deflection of a blast loaded cantilever beam by the modified Galerkin method(Montana State University - Bozeman, College of Engineering, 1969) Koszuta, Daniel MichaelItem Parameter investigation for low frequency vibration of the forearm(Montana State University - Bozeman, College of Engineering, 1972) Matz, Roger EdwardThe need to be able to predict the response of portions of the human body to dynamic loading has been well established, and it is the purpose of this study to experimentally investigate the effects of several independent parameters as they relate to the frequency response of a biological system. Specifically, the forearm of volunteer subjects was excited by a very small amplitude, sinusoidal forcing function at a position near the styloid process, and the response of the arm was measured with an accelerometer located near the olecranon process. The input forcing function frequency was automatically swept through a frequency range of 80 to 600 Hz, and the resultant output frequency response was recorded as a power spectral density curve by means of a wave analyzer. The natural frequencies of the arm were considered to be the frequencies at which relative peak amplitudes occur in the power spectral density curve. For each subject, four independent parameters, as well as the dependent variable (natural frequency), were measured. These four independent parameters were r (1) arm length as measured from elbow to wrist, (2) bone size as indicated by wrist size, (3) muscle development as indicated by the percent increase in upper arm circumference from unflexed to flexed position, and (4-) fleshiness as indicated by the ratio of unflexed upper arm circumference to wrist width. The subjects utilized were approximately 250 college-age males. The significance of the effects of each of the foregoing parameters, and of the interactions between these parameters, on the dependent variable was examined via a 2 n fixed factor, factorial experiment. The experimental results indicated all of the four factors significantly affected the resonant frequency at the 99% level of confidence. It was further determined that each of these factors had significant interactions, with all two way interactions except arm length-bone size and muscle development-fleshiness significant. All three way interactions were significant. No general trend was determined for any factor except bone size, for which an increase in level tended to cause a decrease in natural frequency. It was concluded that although other parameters may be found which affect the resonant frequency, these four were the ones of most importance.