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  • Mixing and Isosurface Geometry in Turbulent Transverse Jets
    Shan, Jerry Wei-Jen
    • Abstract : Mixing and the geometry of jet-fluid-concentration level sets in turbulent transverse jets were experimentally studied. Jet-fluid concentration fields were measured with laser-induced fluorescence and digital imaging techniques for Reynolds numbers between 1000 and 20000. The scalar field is assessed in terms of classical measures, such as two-dime...
    • Date : 2002-01-29
    • Institution : California Institute of Technology
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  • Semi-contained Interactions of Atmospheric Neutrinos in the MACRO Detector
    Nolty, Robert G.
    • Abstract : Atmospheric neutrinos arise from the decay of particles (primarily pions, muons and kaons) produced in the collision of high energy cosmic ray particles with the atmosphere. The great distances traveled by atmospheric neutrinos between their production and detection make them useful for studying neutrino oscillations, the predicted phenomenon of ma...
    • Date : 2002-01-17
    • Institution : California Institute of Technology
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  • Observations of Carbon Monoxide in the Starburst Galaxy M82 with a 690 GHz Wide Spectral Bandwidth Receiver
    Ward, John Strawn
    • Abstract : A 690 GHz wide spectral bandwidth heterodyne receiver was developed to observe the J=6-5 rotational emission line of carbon monoxide (CO) in extragalactic sources. This receiver is based on a niobium superconductor-insulator-superconductor (SIS) mixer with a twin-slot antenna in a superconducting NbTiN ground plane. A 4-8 GHz low-noise amplifier wa...
    • Date : 2002-01-17
    • Institution : California Institute of Technology
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  • Synthesis, Passivation and Charging of Silicon Nanocrystals
    Boer, Elizabeth A.
    • Abstract : Silicon nanocrystals are intriguing from both a fundamental and an applied physics point of view. The efficient room temperature luminescence exhibited by Si nanocrystals (as compared to bulk silicon) and the apparent size-dependent bandgap of Si nanocrystals are two incompletely explained phenomena. Meanwhile, the applied physicist may take advant...
    • Date : 2002-05-10
    • Institution : California Institute of Technology
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  • Blocking Adhesion to Cell and Tissue Surfaces via Steric Stabilization with Graft Copolymers containing Poly(Ethylene Glycol) and Phenylboronic Acid
    Winblade, Natalie Dawn
    • Abstract : Graft copolymers were designed to coat biological surfaces and thereby block subsequent adhesion and recognition events with other proteins, cells, and tissues. Inspired by polymeric steric stabilization of colloidal dispersions, the copolymers contain a backbone with affinity for biological surfaces and grafted side-chains that are resistant to ad...
    • Date : 2002-11-20
    • Institution : California Institute of Technology
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  • Computational Enzyme Design
    Bolon, Daniel N.
    • Abstract : The long-term objective of computational enzyme design is the ability to generate efficient protein catalysts for any chemical reaction. This thesis develops and experimentally validates a general computational approach for the design of enzymes with novel function. In order to include catalytic mechanism in protein design, a high-energy state (HES...
    • Date : 2002-01-28
    • Institution : California Institute of Technology
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  • Experimental Investigation of Quasistatic and Dynamic Fracture Properties of Titanium Alloys
    Anderson, David Deloyd
    • Abstract : The goal of this work is to investigate the quasistatic and dynamic fracture properties of three titanium alloys: 6Al-4V titanium, 6Al-4V titanium ELI, and Timetal 5111. While standard tests exist for measuring quasistatic fracture toughness, the dynamic investigation requires that several measurement techniques are employed including Coherent Grad...
    • Date : 2002-02-15
    • Institution : California Institute of Technology
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  • Direct Energy Bandgap Group IV Alloys and Nanostructures
    Ragan, Regina
    • Abstract : Novel group IV nanostructures were fabricated and the optical properties of such nanostructures were investigated for monolithic integration of optically active materials with silicon. The SnxGe1-x alloy system was studied due to the previous demonstration of an indirect to direct energy bandgap transition for strain-relieved SnxGe1-x films on Si(0...
    • Date : 2002-02-15
    • Institution : California Institute of Technology
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  • An Investigation of Ion Engine Erosion by Low Energy Sputtering
    Duchemin, Olivier B
    • Abstract : Unlike chemical propulsion systems, which are fundamentally limited in performance by propellant energy density, electric propulsion devices, such as ion engines, are limited in total deliverable impulse by maximum propellant throughput due to engine wear. In order to perform realistic modeling of engine lifetime, the erosion mechanisms involved mu...
    • Date : 2002-03-06
    • Institution : California Institute of Technology
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  • Neural computations leading to space-specific auditory responses in the barn owl
    Arthur, Benjamin Jacob
    • Abstract : Sound localization is the ability to pinpoint the direction a sound is coming from based on auditory cues alone. Neurons in the brain which mediate this behavior are active only when sound comes from a particular direction. This thesis uses physiological and anatomical methods to investigate the computations which lead to such space-specific neural...
    • Date : 2002-04-18
    • Institution : California Institute of Technology
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    Last updated on : 27 December 2002