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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 19 of 19 for “"spring systems"”.
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Micromagnetic simulations of magnetic exchange spring systems
Magnetic exchange spring systems are multi-layers or composites of magnetically hard and soft materials that are exchange-coupled across their interfaces. In recent years, research into exchange spring systems has flourished, with potential for application in high-performance permanent magnets, GMR …
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Evaluating the use of particle-spring systems in the conceptual design of grid shell structures
This thesis evaluates particle-spring systems as conceptual design tools in an effort to create efficient grid shell structures. Currently many simulation tools are available to create representations of intricate geometries and forms. However, these forms can become highly complex and challenging …
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Comparative analysis of aquatic insect, amphipod, and isopod community composition along environmental gradients in rheocrene spring systems of Missouri
Spring systems in Missouri harbor a unique biota and provide critical initial discharge from subterranean aquifers to streams. However, little research has been conducted on the crenobiology or ecology in these systems. In this study, aquatic insect, amphipod, and isopod communities were examined …
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Efficient techniques for soft tissue modeling and simulation
… and ChainMail, we have implemented a mass spring system because of its acceptable accuracy and speed. Mass spring systems have, however, some drawbacks such as, the determination of simulation coefficients with their iterative nature. Given the correct parameters, mass spring systems can …
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Multiphysics simulations of magnetic nanostructures
… also been extended in order to model exchange spring systems. Using Nmag, we carried out micromagnetic simulations in order to characterise the magnetisation dynamics in exchange spring systems and derived analytical models to validate and gain further insight into the numerical results. We …
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Establishing Patterns in Vegetation Associations of the Fountain Darter Etheostoma fonticola in the San Marcos and Comal Rivers of Texas
… Darter Etheostoma fonticola, found only in spring systems of the San Marcos and Comal rivers in central Texas, is reported to associate with vegetation for feeding, reproduction, and refuge. Descriptions of associations with vegetation range from preferred to exclusive, whereas other studies …
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Identification of fecal pollution sources of karst waters by a combination of Bacteroidales genetic marker, bacterial indicators, and environmental variables
… and environmental variables. Water samples from springs and wells were collected from Illinois, Wisconsin, Kentucky and Missouri quarterly. Quantitative PCR with seven primer sets targeting different members of Bacteroidales was used to discriminate human and livestock fecal pollution. The …
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Biomechanics of Hierarchical Elastic Systems
… across the tree of life. The ubiquity of elastic systems in biology is partly due to the variety of useful functions they permit such as the simplification of motor control in running cockroaches and the efficient recycling of kinetic energy in hopping kangaroos. Elastic energy is also responsible …
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Towards Real-Time Simulation Of Hyperelastic Materials
… types of hyperelastic materials from mass-spring systems to three-dimensional finite element models, pushing the performance of the simulation towards real-time. Fast simulation methods such as Position Based Dynamics exist, but support only limited selection of materials; even classical …
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Exploring Eastern Musk Turtle (Sternotherus odoratus) Population Dynamics and Phenotypic Plasticity in Comal Springs, Texas
Freshwater turtles are vital to aquatic ecosystems but are increasingly affected by anthropogenic change. The eastern musk turtle (Sternotherus odoratus) is a small, omnivorous species inhabiting spring systems in Central Texas, where invasive gastropods have become abundant. This study …
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Eigenvalue optimization and its applications in buckling and vibration
… The physical parameters of optimal discrete link-spring models, which maximize the buckling loads, are reconstructed. It is shown that the optimal system can be determined recursively by using a one parameter iterative loop. The mathematical problem of determining parameters of an affine sum such …
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New feedback design methodologies for large space structures: a multi-criterion optimization approach
A few problems of designing structural control systems are addressed, considering optimization of three design objectives: state error energy, control energy and stability robustness. Tradeoff relationships among these selected design objectives are investigated by solving multiple objective …
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Non-ideal exchange springs in DyFe2/YFe2 superlattices
Magnetic exchange spring systems have potential applications in (i) the next generation of permanent magnets and (ii) storage elements in information systems. However any practical realization of this potential will involve a study of non-ideal exchange spring behaviour. Within the context of …
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An Isotopic Examination of Cave, Spring and Epigean Trophic Structures in Mammoth Cave National Park
<p>AN ISOTOPIC EXAMINATION OF CAVE, SPRING AND EPIGEAN TROPHIC STRUCTURES IN MAMMOTH CAVE NATIONAL PARK</p> <p>Name: Zacchaeus Greg Compson Date: October 15, 2004 Pages: 56</p> <p>Directed by: Philip Lienesch, Doug McElroy, Michael Stokes and Richard Bowker</p> <p>Department of Biology Western …
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Modifying the magnetic properties of Laves phase intermetallic multilayers and films by nano-patterning and ion implantation
… & Coey some 20 years ago, the topic of exchange springs has received considerable attention. Exchange springs, systems where thin hard and soft magnetic layers are alternately arranged in multilayer stacks, provide great potential in improving the performance of a wide range of devices, from …
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The dynamics of ultrafast motion in biological and bio-inspired systems: the case study of click beetles
… such high accelerations using complex latch and spring systems to overcome their muscle force-speed trade-offs and amplify mechanical power output. This dissertation introduces a multi-scale analytical and experimental framework to investigate how extreme accelerations are generated in biological …
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Effects of Extreme Flow Events on Community Composition and Habitat Complexity of Groundwater Dominated Systems
Extreme flow events in the form of major floods and droughts are primary drivers in structuring aquatic habitats and communities. While floods and droughts can directly alter aquatic biota by displacement or by increased mortalities, extreme flow events can have an indirect and prolonged effect on …
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CARBONIC SPRINGS AS DISTAL MANIFESTATIONS OF THE JEMEZ GEOTHERMAL SYSTEM, SAN YSIDRO, NEW MEXICO, HIGHLIGHTING THE IMPORTANCE OF FAULT PATHWAYS AND HYDROCHEMICAL MIXING.
… out on three groups of carbonic warm and hot springs in New Mexico, USA: 1) Tierra Amarilla springs (~ 20ºC), near San Ysidro south of Nacimiento Mountains, 2) Penasco springs (~ 20 ºC) along the Nacimiento fault west of the Nacimiento basement mountain block, and 3) Soda Dam, Jemez, and …
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U-series dating, geochemistry, and geomorphic studies of travertines and springs of the Springerville area, east-central Arizona, and tectonic implications.
High CO2 springs and related travertine deposits of the Springerville area of east-central Arizona provide an exceptional field laboratory for understanding travertine-depositing spring systems. U-series dating of travertines provides an opportunity to unravel paleohydrologic and neotectonic …