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 67 for “"mass ratios"”.
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Mass ratios in stellar triple systems that admit horseshoe orbits
… tested according to the initial parameters of mass for each of three bodies and position and velocity for the smallest body. The masses are arranged hierarchically, so as to mimic systems like Sun- Jupiter-Trojan. For a mass ratio of 1:10-4:10-8 known to produce horseshoe orbits, a grid search …
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Alaskan Eskimo and Polynesian Island Population Skeletal Anatomy: The "Pacific Paradox" Revisited Through Surface Area to Body Mass Comparisons
… demonstrate similarities in the two body mass estimations; the bi-iliac breadth measurement and maximum femoral head diameter, and in the overall stature to body mass ratios, except in the males, who are significantly different in every measurement apart from surface area to body mass …
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Alaskan Eskimo and Polynesian Island Population Skeletal Anatomy: The "Pacific Paradox" Revisited Through Surface Area to Body Mass Comparisons
… demonstrate similarities in the two body mass estimations; the bi-iliac breadth measurement and maximum femoral head diameter, and in the overall stature to body mass ratios, except in the males, who are significantly different in every measurement apart from surface area to body mass …
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Conducting polymer actuators
… of up to 6 %, strain rates of 4 %/s, power to mass ratios of 40 W/kg and forces of up to 34 MN/m2 are achieved. Polypyrrole nearly equals mammalian skeletal muscle in power to mass and exceeds it in force by two orders of magnitude. A model is developed which predicts the electrochemical …
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Theoretical And Experimental Studies On The Instability Of Charged Liquid Drops
… conditions, carries about 25% of the initial mass and 40% of the initial charge. The results also show that the difference between the final energy, calculated at different sibling mass ratios, and the minimum final energy is very small for a very wide range of sibling mass ratios (0.1 to 0.9) …
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A Microstructural Model for a Proton Exchange Membrane Fuel Cell Catalyst Layer
… resulting in optimal porosity and material mass ratios has been employed. The construction rule set in this design is easily variable, enabling a wide range of catalyst layer geometries to be made. The generated catalyst layers were found to exhibit many of the features found in currently …
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Rhodium as a promoter for an iron Fischer-Tropsch catalyst
… by impregnation. Three catalysts with varying mass ratios of rhodium to iron (1.3 Rh/100 Fe; 2.4 Rh/100 Fe; 3.9 Rh/100 Fe) were prepared by incipient wetness impregnation fo the base catalyst using rhodium chloride solution.
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The detection of gravitational microlensing anomalies
… in the probability of detecting planets with mass ratios smaller than q = 10⁻³
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Development and thermal characterization of polydiacetylene (PDA) nanofiber composites for smart wound dressing applications
… via an electrospinning method at various mass ratios of PEO to PCDA, solution concentrations, and injection speeds. High mass ratios of PEO to PCDA, low polymer concentrations, and low injection speed promoted fine fibers with smooth surfaces. The colorimetric transition of the fibers was …
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Investigating Exoplanets and Transients Using Small-Aperture Telescopes
… shape. Look-up charts were also generated for mass ratios of 10^-6 through to 10^-1. These look-up charts are intended to provide a quick reference volume correction to exoplanets (or any other system of similar mass ratios). As part of the Gaia transient preparatory and to demonstrate the …
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Optimal cooperative power-limited rendezvous
… depend in a complicated way on the power-to-mass ratios of the two spacecraft, the initial conditions, and the specified transfer time. Propellant and terminal orbit constraints are also discussed.
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The Effect of the Solar Cycle on Satellite Orbital Lifetime
… atmospheric drag. Satellites with larger area-to-mass ratios generally have shorter orbital lifetimes than satellites with small area-to-mass ratios. Missions that get delayed and have more of their operations during solar maximum than planned originally may have too short of a mission lifetime …
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Topics in Gravitational-Wave Astrophysics
… <p>gravitational wave searches for comparable mass binary black holes. We determine</p> <p>the domain of applicability of the computationally inexpensive closed form models,</p> <p>and the same for the semi-analytic models that have been calibrated to Numerical</p> <p>Relativity simulations …
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Geochemistry of deep-sea hydrothermal vent fluids from the Mid-Cayman Rise, Caribbean Sea
… pressure, substrate composition, and water/rock mass ratios during the chemical evolution of hydrothermal fluids. At Von Damm, sequential reaction of gabbroic and peridotite substrates at intermediate temperatures can explain generation of the observed fluids. At Piccard, extremely high …
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Mass and Distance Estimation Simulations for the Nancy Grace Roman Space Telescope Using PyLIMASS and a Case Study on Intellectual Property Frameworks in Space Collaborations
… exoplanets beyond the snow line, revealing mass ratios and orbital geometries inaccessible to transit or radial velocity methods. The Nancy Grace Roman Space Telescope will carry out the Galactic Exoplanet Survey to detect thousands of microlensing events with the cadence and precision …
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Proteomics approach to investigate separation behavior of proteins in ion-exchange chromatography
… were obtained by quantifying protein spot mass for the top and bottom phase gels so that mass ratios could be calculated for matched spots. The characterized three protein molecular properties were used to represent protein charge, size and surface hydrophobicity, which showed different …
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Emissions testing of two recreational marine engines with water contact in the exhaust stream
… compounds, and aqueous samples are reported. The mass ratios of hydrocarbons to carbon dioxide gaseous emission for the MerCruiser and Mercury engines were approximately 0.0046 and 0.55 respectively. These results show that concerns over gaseous hydrocarbon emissions from these sources are …
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Infrared excesses from accretion streams in pre-main-sequence binaries
… to study the formation and evolution of mass streams that transfer material from a circumbinary disk to the stars of a close binary. These streams form when the disk is hot enough and/or viscous enough (thickness-to-radius ratio c ≥ 0.05, for viscosity parameter alpha > 0.01). We …
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Cavity dynamics of water entry for spheres and ballistic projectiles
… enriched with the consideration of varying mass ratios and rotational velocities. This thesis uses advanced high-speed imaging and visualization techniques to discover underlying physics and further our understanding of these phenomena through improvements to analytical solutions describing …
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Design of a High Specific Power Electric Machine for Turboelectric Propulsion
… motor-powered propulsors, are limited by the mass and losses of the electric components introduced into the drivetrain. These propulsion systems are predicted to result in a 15\% fuel savings provided that megawatt-class electrical machines (EMs) and power electronics (PEs) are available with …
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