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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 65 for “"bulk modulus"”.
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Low-Temperature Bulk-Modulus of Solid Argon
Made available in DSpace on 2015-05-12T22:38:59Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 7405735.PDF: 4331136 bytes, checksum: 28d4c92935b9f534b5ad68bc8ec65beb (MD5) Previous issue date: 1973
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Low temperature bulk modulus of solid argon
… crystal in this pressure range, give a P=O, T=O bulk modulus of 28.8±0.4 kbar. This value is in good agreement with the value obtained by extrapolating recent piston-displacement measurements to P=O and also with recent theoretical calculations which incorporate three-body forces. A comparison …
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The velocity of sound in solid krypton
… previous deductions made from measurements of bulk modulus and heat capacity. The present velocity results are compared with model calculations based on m-6 Mie-Lennard~Jones pair potentials but there is only fair agreement. The adiabatic bulk modulus was obtained from the longitudinal and …
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Measuring material properties of tectorial membranes from normal and genetically modified mice
… was found to be the primary determinant of the bulk modulus. However, the shear modulus was not affected. Collla2 is one of the genes that encodes for type XI collagen. Mutation in this gene causes no significant change in fixed charge concentration and, therefore, bulk modulus. However, the …
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A study of Asphalt Aging Behavior Using Molecular Dynamics Simulations
… which is revealed by the increase of density, bulk modulus and viscosity. Considering the mechanical property of asphalt using MD simulations, both the unoxidized and oxidized asphalts deform more and fail faster with an increase in both compressive and tensile stress rates, especially under …
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The effect of trivalent cations on the major lower mantle silicates
… The presence of trivalent cations decreases the bulk modulus of perovskite at pressures corresponding to the upper lower mantle. Ferric iron in perovskite undergoes a spin-pairing transition from the high spin state to low spin in the octahedral site. Ferric iron in the dodecahedral site remains …
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The Effect of Zr-Doping and Crystallite Size on the Mechanical Properties of TiO2 Rutile and Anatase
… size to the nanometer range modifies the bulk modulus of rutile. These results are different from those of anatase, where a decreasse of crystallite size and doping with Zr leads to an increase of the bulk modulus. Second order EoS fits (K0’=4) resulted in a bulk modulus of microscale …
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Investigations into the mechanics of connective tissue
… was discovered that there is a softening of the bulk modulus at small time scales resulting in a volume increase following deformation, the bulk modulus then recovers and there is over all no volume change. This is in stark contrast to the typical case, where it is the shear modulus that becomes …
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Rock physics investigations using pressure oscillations
… permeability, storage capacity and pseudo-bulk modulus of rocks simultaneously. I present the method, calibration measurements (capillary tube) and sample measurements (sandstone) of permeability and storage capacity at reservoir conditions. A concurrent measurement of elastic properties …
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Pressure-induced phase transitions in select molybdates and tungstates
… GPa that was observed by a stiffening of its bulk modulus from 51 GPa, for the low-pressure phase, to 141.5 GPa for the high-pressure phase. Bi[sub]2W[sub]2O[sub]9 exhibited a phase transition at ~11 GPa that was observed by a change in the x-ray diffraction pattern. Bi[sub]2WO[sub]6 exhibited …
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The Steady Performance of Complaint-surface Aerostatic Thrust Bearings
… experimental apparatus to determine the bulk modulus of the elastomers to be used was also constructed, and the design was similar in principle of operation to one described by Rightmire [305]. Experiments were first performed on rigid bearings to develop the rig. A method of predicting …
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The phonon spectra of simple metals - higher order effects of the electron-ion interaction
… customary in the past. An. expression for the bulk modulus is derived by studying the long-wavelength behavior of the phonon dynamical matrix in the two-umk1app approximation and this agrees with that calculated from the second-order perturbation theory expression for the energy of the uniform …
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Molecular Theory of the Structure, Thermodynamics, and Miscibility of Polymer Nanocomposites
… structural features. Finally, the thermodynamic bulk modulus of the system is found to universally and monotonically decrease as &phis; is increased."
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Accelerated atomistic prediction of structure, dynamics and material properties in molten salts
… thermophysical and transport properties such as bulk density, thermal expansion coefficient, bulk modulus, and diffusivity, which were compared to available experimental data.
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Study of Active Valve Timing on Efficient Hydraulic Piston Motor Operations
… integrated into a commercial pump. A rectified bulk modulus model was derived from a novel mass transfer experiment to determine the compressibility of oil with entrained gas based on an optical bubble size measurement. The contributions of the thesis are: (1) the validated analytical and …
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Calculations of the elastic constants of crystals as functions of pressure with applications to quartz and cristobalite
… pressures and yield pressure derivatives of the bulk modulus that are in close agreement with that observed for quartz. Using the SQLOO potential, although the results of the calculations do not agree with the experimental data as well as those calculated using the two ionic potentials, the …
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Material property extraction procedure for electromomentum coupled metamaterials
… et al. to measure the complex-valued density and bulk modulus, including negative values, [Phys. Rev. B, 76(14), 114302, (2007)], and Muhlestein et al. who extended the work of Fokin et al. to measure Willis coupling in addition to density and bulk modulus [Nat. Commun., 8, 15625, (2017)]. This …
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Time-resolved spectroscopic characterization of ballistic impact events in polymer and nanocomposite materials
… mechanical property information, such as elastic modulus, bulk modulus, shear modulus, and Poisson's ratio are measured using impulsive stimulated thermal scattering, a laser-based photoacoustic technique.
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High Temperature And Pressure Resonant Ultrasound Spectroscopy Study Of Metal Hydride Systems
… of 250–500 psi. A strong softening of the shear modulus was observed at temperature and pressure points around the critical points, 293 °C and 290 psi respectively. On the other hand, anomalous softening of the bulk modulus and the C' was observed in the same temperature and pressure region. The …
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The effects of fluid pressure changes on fractured rock elastic moduli and surface deformation
… models use the elastic moduli of rock, both bulk and shear, to compute deformation. These moduli may change with pressure and fracture density, but this effect is usually left out of models. This work shows effective elastic moduli of fluid-filled fractured rock through a self consistent …
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