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 63 for “"volume expansion"”.
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Exercise Induced Hypervolemia: Role of Exercise Mode
… has been shown to limit exercise-induced plasma volume expansion. Differences in hydrostatic pressure gradients between the standing and seated position indicate that treadmill exercise might promote a greater plasma volume expansion than cycle ergometer exercise. To test this hypothesis ten …
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Investigation of the Lanthanide Sesquioxides as High Temperature Transformation Toughening Agents
… examined. This transformation involves an 8-10% volume expansion and a shape change ($\Delta\beta$) of $\sim$10$\sp\circ$. Techniques used in the investigation of the transformation behavior included: grinding, cooling in liquid nitrogen, DTA, dilatometry, ambient and high temperature Vickers …
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High pressure diffraction studies of gallosilicate natrolite: applications to pressure-induced cation trapping
The natrolite family of zeolites undergoes volume expansion under pressure. Natrolite itself is a three dimensionally porous zeolite with 8-ring channels. It shows an unusual unit cell volume expansion when under hydrostatic pressure where it undergoes two distinct, reversible phase transitions to …
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Investigation of non-intercalation electrode materials for next-generation batteries
… CNT/NaI cathode are examined. In Chapter 5, a volume expansion issue of conversion electrodes is addressed. A 3D Ni supported Sb2O3 electrode is prepared by colloidal templating and pulsed electrodeposition followed by heat treatment. Larger pore interconnects are obtained in the 3D scaffold to …
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Sympathetic neural control of renal blood flow
… the frequency spectrum of RSNA and RBF following volume expansion in conscious rabbits. At least 6 days prior to experiments animals underwent surgery to implant an electrode for recording renal nerve activity and a flow probe for recording RBF. Volume expansion resulted in a 25 ± 5% decrease in …
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THE RELATIONSHIP BETWEEN AEROBIC TRAINING AND CARDIOVASCULAR RESPONSE TO EXERCISE
… the effect of short-term training-induced plasma volume expansion on the cardiac and peripheral vascular capacity of untrained males (n=14) was examined. Impedance cardiography was used to examine stroke volume and cardiac output, whereas resting and peak blood flow were assessed using …
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Microbubble cell actuator
… mechanism uses a vapor microbubble as a means of volume expansion to create a jet of fluid that ejects a particle. The theory, design, and testing are described, and successful operation of the device is demonstrated. Applications and suggestions for future work are discussed.
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Microstructure and mechanical properties of laser shocked iron-based alloys
… W/cm$\sp2$. Shock waves were generated by volume expansion of the plasma formed when the material was laser irradiated. Maximum shock wave intensities were obtained using an energy-absorbing black paint coating without a plasma-confining overlay. Maximum modification of the material surface …
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Comparison of oil and intensive quenching via coupled thermal, transformation, and mechanical modeling
… core. When the core austenite transforms, the volume expansion was insufficient to overcome the thermal contraction resulting in large compressive stresses at the surface and core, and a large tensile stress at the mid-radius. This profile was not found in literature. 1020 was found to …
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Design, development and experimental validation of a lab-scale system for rapid rotational molding of functionally graded integral-skin cellular polyethylene composites
… were assessed in terms of: foam density, volume expansion ratio, cell density, and cell size. The experimentally obtained rotationally molded foam composites desirably exhibited gradual change in compositional quality and morphology from one region to another, which was correlated with the …
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Stress evolution of thin film RuO₂ Li-ion battery electrodes
… obstacle to TFB battery development is high volume expansion and material degradation in electrodes with high theoretical Li ion capacities. Among these materials is RuO₂, which exhibits excellent capacity and great potential for use as either cathode or anode in low power electronics. In …
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Preparation, microstructure and properties of silicon carbide-dysprosia composites
… (monoclinic to cubic) phase transformation with volume expansion during cooling from high temperatures ($\approx$1850$\sp\circ$C). The effects of Dy$\sb2$O$\sb3$ additions on the microstructure and on selected mechanical properties of the composites were investigated. The phase analysis and …
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Multi-Proxy Records of Climate and Carbon Cycle Perturbations in the Paleozoic: Integrating Isotope Geochemistry and Sedimentology
… a ~5ºC global cooling and substantial ice volume expansion coincident with a major perturbation to the global carbon cycle. Chapter 5 examines the extent to which diagenesis and facies- and phase-specific effects drive a major Early Mississippian carbon isotope excursion. In aggregate, this …
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Phase-field simulation of freezing water droplet
… cold plate, a pointy tip forms as the result of volume expansion. In this dissertation, we will introduce a quasi-compressible phase-field model that deals with this non-isothermal three-phase system involving water, ice, and air. The water-ice phase transition and the water-air fluid interface …
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Alkali attack on coal gasifier refractory lining
… of the Na₂O⋅Al₂O/K₂O⋅Al₂O₃ compounds cause large volume expansion from the reaction surface which causes poor thermal shock resistance and eventual refractory failure. The hot face of an alumina-chrome refractory in service in an alkali environment will be prone to failure by alkali attack.
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Modeling of Effect of Alloying Elements on Radiation Damage in Metallic Alloys
… size between Fe and W can introduce both global volume expansion and local lattice distortion in the Fe matrix. In order to understand how oversized W influences the defect production behaviors in Fe-based alloys, molecular dynamics simulations were conducted to study the primary damage in three …
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Nonequilibrium phase Behaviour and Mass Transfer of Alkane Solvents(s)-CO2-Heavy Oil Systems Under Reservoir Conditions
… solvent(s)–CO2–heavy oil systems at a constant volume expansion rate and a constant pressure decline rate, respectively. Experimentally, constant-composition expansion (CCE) tests have been conducted for alkane solvent(s)–CO2–heavy oil systems with a PVT setup, during which not only pressure and …
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Porous anodic aluminum oxide scaffolds; formation mechanisms and applications
… formation of H-AAO originate from suppressed volume expansion and plastic flow of Al₂O₃ confined by the SiO₂ hard mask. By determining new anodization conditions leading to zero volume expansion, dendritic H-AAO can be avoided and kinetic retardation can be minimized. A new method for …
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Low birthweight discrimination using maternal variables.
… (1973) have shown a relationship between plasma volume expansion in pregnancy and birthweight. Plasma volume has previously been studied but only in isolation from the other maternal factors or in small scale surveys. From 1967 to 1980, antenatal and birth records including a number of maternal …
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