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 254 for “"Reorientation"”.
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Visual features for scene recognition and reorientation
In this thesis, I investigate how scenes are represented by the human visual system and how observers use visual information to reorient themselves within a space. Scenes, like objects, are three-dimensional spaces that are experienced through twodimensional views and must be recognized from many …
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Time-optimal reorientation maneuvers of an aircraft
The problem of time-optimal fuselage-reorientation maneuvering of a combat aircraft, with and without thrust-vectoring capability, was analyzed. An accurate mathematical model for the reorientation maneuvers of interest was developed, to ensure practical value of the analysis. In particular, an …
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Satellite Reorientation Using Reinforcement Learning Under Unknown Attitude Failure
<p>This study presents a reinforcement learning (RL) approach for reestablishing communication with deep-space satellites under unknown attitude determination and control system (ADCS) failures. When traditional fault-tolerant control methods cannot restore signal, the proposed RL controller acts …
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Development of astronaut reorientation methods : a computational and experimental study
… are developed to create and analyze astronaut reorientation methods. The computational development of control methods for human motion planning offers a novel way to provide astronauts with maneuvers that are difficult to obtain experimentally in Earth gravity (1-G). Control of human-body …
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Mechanisms of reorientation in phytoplankton : fluid shear, surface interactions, and gravitaxis
Phytoplankton are a vital part of the ecosystem in oceans and lakes, where they form the base of the food chain and have major global impacts, for example producing 50% of the planet's oxygen. Phytoplankton can also serve as a clean source of biofuel and, as concerns over both climate and energy …
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Examining the Associations Between Puberty and Social Reorientation at the Neural Level
Social reorientation theory posits that puberty may facilitate changes in social relationships, such as spending less time with parents and heightened motivation towards peer relationships, by reorienting neural responses to prioritize peer social information. However, limited studies have …
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Towards a vegan jurisprudence : the need for a reorientation of human rights
The objective of this thesis is to develop a new way of thinking about the theory and practice of human rights to accommodate the demands of vegans for basic moral rights for nonhuman animals. The work firstly outlines the ways in which the claims of vegans, under the right to freedom of thought …
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The Politics of Foreign Policy Change : Explaining the Swedish Reorientation on EC Membership
… Allan Larsson, Carlsson launched the policy reorientation in the midst of a severe balance of payments crisis. By redefining Swedish EC membership from a political to an economic issue, he successfully capitalized on the seriousness of the economic situation and marginalized potential …
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Gas-phase processes for carbon nanotubes production: catalyst synthesis and CNT reorientation dynamics
… of single-walled CNTs (SWCNTs) and the gas-phase reorientation dynamics of CNTs, which is a critical step preceding aerogel formation in the FCCVD process. This dissertation develops a novel aerosol synthesis route induced by corona discharge at ambient conditions to harness the effect of unipolar …
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Understanding Ferroelastic Domain Reorientation as a Damping Mechanism in Ferroelectric Reinforced Metal Matrix Composites
Ferroelectric-reinforced metal matrix composites (FR-MMCs) offer the potential to improve damping characteristics of structural materials. Many structural materials are valued based on their stiffness and strength; however, stiff materials typically have limited inherent ability to dampen …
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RAPID REORIENTATION OF ATTENTION IN CHILDREN WITH AND WITHOUT ATTENTION DEFICITS (COGNITIVE DEVELOPMENT, HYPERACTIVITY, DISORDER)
… improvement with age was found in the speed of reorientation from the central point to the target area. In a third experiment, auditory reorientation of attention was measured in hyperactive and nonhyperactive children matched for age, sex, and IQ. Using the same task used in the first …
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Potential-Dependent-Adsorption and Reorientation Responses Associated With a Phospholipid Monolayer at the Water /Dichloroethane Interface
Total internal reflection fluorescence (TIRF) and electrocapillary measurements were employed to interrogate the potential dependent mechanical and physicochemical properties of adsorbed films at the interface between two immiscible electrolyte solutions (ITIES). Mixed films of a phospholipid, …
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ENVIRONMENTAL GEOMETRY IN FISHES AND TORTOISES: EFFECT OF LANDMARKS, BEHAVIOURAL METHODOLOGIES, AND SENSORY CHANNELS ON SPATIAL REORIENTATION
The present Thesis explored spatial reorientation behaviour of three species of fish (the zebrafish Danio rerio, the redtail splitfin fish Xenotoca eiseni, the goldfish Carassius auratus) and one species of reptiles (the Hermann tortoise Testudo hermanni) to widely assess three issues: 1) the use …
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Synthesis and Characterization of Heusler Compounds with Non-Collinear Magnetic Structure - From Spin Glasses to Spin Reorientation
… Heusler series Fe3−xMnxSi, which features a spin reorientation transition at low temperatures. Despite being one of the most studied Heusler systems, the magnetotransport properties were not yet covered systematically in literature. The presented investigations unveiled that the mechanisms of …
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Raman Spectroscopy of Dense Fluids. Temperature and Pressure Effects on Vibrational Relaxation, Molecular Reorientation and Spectral Frequencies
This work reports measurements of the Raman spectra of the Si-CH(,3) and C-H stretching modes of tetramethylsilane, the C-H stretching mode of fluoroform, and the C = O stretching mode of acetone. All spectra were measured under independently varied conditions of temperature and pressure.
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Temperature and High Pressure Light Scattering Studies of Linear Triatomic Molecules in the Liquid State (Reorientation, Dephasing, Collision-Induced)
… in carbon disulfide and carbonyl sulfide, and reorientational motion and vibrational relaxation in carbonyl sulfide.
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Stimulus Modality and the Rotational Error: An Examination of the Various Reorientation Accounts in Humans Using a 3D Virtual Environment
<p>Reorientation occurs when an organism enters a novel environment and utilizes cues within said environment to get its bearings. Though reorientation occurs, little is known about which cues are utilized to reorient and the mechanism underlying this reorientation process. Three competing accounts …
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DIS/REORIENTATION OF CHINESE INTERNATIONAL STUDENTS’ RACIAL AND ETHNIC IDENTITIES IN THE U.S.: COMMUNICATING RACE AND ETHNICITY IN THE GLOBAL-LOCAL DIALECTIC
… 66), to study the racial and ethnic identity dis/reorientation process of Chinese international students in the U.S. Specifically, I used ethnographic observations, interviews, and autoethnographic journaling as my research methods to examine the direct, subjective, and embodied experiences of my …
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