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.
Results
Showing 1 to 20 of 179 for “"Tether"”.
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Three-dimensional tether awareness trainer
Thesis (S.B. and M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1999.
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Varying tether lengths for modifying orbital eccentricities
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1985.
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Emission of whistler waves from an ionospheric tether
In this thesis, we analyze how electromagnetic waves propagate in ionosphere around the earth which is magnetized plasma. We calculate the electromagnetic wave field made by a dipole antenna at an arbitrary observation point far from the antenna using the Stationary Phase Method. With this wave …
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A part-task trainer for underwater tether awareness
Thesis (S.B. and M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998.
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Optimal Electrodynamic Tether Phasing and Orbit-Raising Maneuvers
… solutions for a point-mass electrodynamic tether (EDT) performing phasing and orbit-raising maneuvers. An EDT is a conductive tether on the order of 20 km in length and uses a Lorentz force to provide propellantless thrust. We develop the optimal equations of motion using Pontryagin's …
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Radiation of VLF/ELF waves from a magnetospheric tether
… Waves (EMIC) from a high-voltage magnetospheric tether, which are the waves proposed to scatter protons. The plasma is anisotropic due to the external Earth's magnetic field and it is assumed to have sufficiently low density, temperature and degree of ionization so that collisions and thermal …
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Membrane tether formation from outer hair cells with optical tweezers
… of OHC plasma membrane (PM) by pulling tethers. A greater force was required for tether formations from OHC lateral wall (499 pN +/- 152) than from OHC basal end (142 pN +/- 49), consistent with the presence of a more extensive cytoskeleton support beneath the PM at the lateral wall. The …
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Electron collection by an electrodynamic bare tether at high potential
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2003.
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Numerical study of current collection by an orbiting bare tether
An electrodynamic (ED) Tether is a long thin conductive string deployed from a spacecraft. A part of the ED tether near one end is rendered positive with respect to the ambient plasma. This positive potential is maintained by the motion-induced Electromotive Force (EMF) or by the power supply, …
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Applications of an electrostatic high-voltage tether to radiation belt remediation
… of magnetospheric ions by an electrostatic tether at various altitudes. This computation relies upon past studies in the OML regime of charged tethers to determine the deflection angles incurred upon incoming ions at any given incident velocity. Calculated depletion rates are used to …
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An examination of peptide-tether binding to gold and glass surfaces
… will bind to a surface. In this thesis, a tether, bead, peptide complex is constructed using the gold binding peptide (GBP) of sequence (CGGVSGSSPDS). Several assays and assay modifications are developed and tested to attempt to attach the GBP first to a gold slide and then to gold …
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The Impact of Atmospheric Models on the Dynamics of Space Tether Systems
… is to de-orbit defunct satellites using a space tether system. A space tether system is often made up of three parts: the main satellite, the tether and the sub-satellite. The tether connects the main satellite and the sub-satellite. Space tether systems make use of the Lorentz force as an …
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Phosphate Tether-Mediated, One-Pot Metathesis Processes: Application in Small Molecule Synthesis
… to utilize the empowering ability of phosphate tethers to mediate a series of reactions towards the synthesis of bioactive molecules by exploiting several salient features inherent to organophosphates, including (i) orthogonal stability under acid conditions, (ii) possessing leaving group …
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Effects of Linoleic Acid on Tether Formation between Monocytes and Endothelial Cells
… hypothesis that linoleic acid increases membrane tether formation between monocytes and endothelial cells. </p><p>Treatment of U937 monocytes with free linoleic acid or albumin-bound linoleic acid reduced the cortical tension of the monocytes. The effects of albumin-bound linoleic acid on the …
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Dynamics and control of the space shuttle based kinetic isolation tether experiment
Thesis (E.A.A.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1988.
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A Study of Dynamics and Stability of Two-Craft Coulomb Tether Formations
… dynamics and stability of a two-craft Coulomb tether formation are investigated. With a Coulomb tether the relative distance between two satellites is controlled using electrostatic Coulomb forces. A charge feedback law is introduced to stabilize the relative distance between the satellites to …
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Dynamics of an Electrodynamic Tether System in a Varying Space-Plasma Environment
Electrodynamic tethers have a wide range of proposed applications in the fields of satellite propulsion and space plasma research. The fundamental purpose of this dissertation is to improve the understanding of the behavior of an electrodynamic tether (EDT) system in Earth's ionosphere. An …
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Multivalent activation in temporary phosphate tethers: A new tether for small molecule synthesis
The use of phosphate esters as temporary tethers, capable of multivalent activation is the broad focus of the dissertation research reported herein. Specifically, the utility of phosphate tethers has been demonstrated through the divalent activation of allylic C2-symmetric monocyclic phosphates. …
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Electron current collection by a positively charged tether using a particle-in-cell method
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1998.
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Phosphate Tether-mediated Approaches for the Syntheses of Complex Polyols, Natural Products and Related Analogs
… discovery. In this regard, the use of temporary tethering of two advanced intermediates has been a very powerful way in streamlining synthetic sequences by decreasing the entropic demand associated with the reactions and thus, allowing to overcome the difficulties associated with the …
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