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 63 for “"Atomic Oxygen"”.
-
Effects of Atomic Oxygen on Outgassing of Silicone Materials
… are material outgassing and the presence of atomic oxygen in low Earth orbit (LEO). Materials that are considered for use in space are tested to be able to understand how they’ll outgas on orbit and how they’ll respond to interactions with atomic oxygen. However, testing to understand how …
-
Spectroscopic studies of atomic oxygen using gas laser techniques
Massachusetts Institute of Technology. Dept. of Physics. Thesis. 1967. Ph.D.
-
Development of a reusuable atomic oxygen sensor using oxide thick films
… would accurately respond to various fluxes of atomic oxygen (AO), allowing it to be regenerated after saturation. The sensors were manufactured using a thick film technique of screen printing over a substrate (alumina) that is inert to the action of AO; some of sensors were developed with pure …
-
Atomic Oxygen Considerations for LEO De-orbit Trajectories Using Solar Sails
… years upon mission termination. To determine how atomic oxygen would affect the solar sail, material from Lightsail-2 was tested in a thermal-energy, isotropic, atomic oxygen vacuum chamber based in the space environments laboratory in California Polytechnic State University. The sail material, …
-
The Effects of Atomic Oxygen on Patch Antenna Performance and Lifetime
… in. For Low Earth Orbiting (LEO) satellites, atomic oxygen (AO) is a constant corrosive effect that degrades the outer surface of satellites over long durations. Atomic oxygen exists in the atmosphere between 180 and 675 km and has a relatively high energy at 4.5 eV, which allows AO to break …
-
A kinetic study of the interaction between atomic oxygen and aerosols
… of aerosols on the kinetics of disappearance of atomic oxygen. Atomic oxygen was generated by a 2450 MHz microwave discharge, and the kinetics of disappearance measured in a fast flow system using N0<sub>2</sub> titration. The recombination coefficient, for heterogeneous wall recombination was …
-
The Effects of Atomic Oxygen on the Outgassing Properties of Spacecraft Materials
… and threaten the success of space missions. Atomic oxygen (AO) and outgassing are among the chief concerns that spacecraft engineers must design for in order to ensure the safety of a spacecraft. AO is monatomic oxygen (O1) that is created when Ultraviolet (UV) radiation photochemically …
-
Atomic Oxygen Effects on Particulate Contamination and Short Beam Strength of Carbon Composites
… in must be considered during the design process. Atomic oxygen (AO) is a detrimental environmental effect found in Low Earth Orbit (LEO) that affects spacecraft surfaces by oxidizing and eroding material over time, particularly polymers. Carbon fiber/epoxy composites are a commonly used spacecraft …
-
Development of a Ground Based Atomic Oxygen and Vacuum Ultraviolet Radiation Simulation Apparatus
… aspects of the space environment include Atomic Oxygen, AO, and Ultraviolet, UV, radiation. UV radiation becomes more severe in space as there is no atmosphere to attenuate incoming photons, thereby exposing spacecraft to radiation that never reaches the surface of the Earth. Overall, …
-
Modification of a Ground Based Atomic Oxygen Simulation Apparatus to Accommodate Three Dimensional Specimens
… aspects of the space en- vironment is Atomic Oxygen, AO. Only present in harmful quantities in Lower Earth Orbit, LEO, AO causes significant damage to materials by breaking molecular bonds. California Polytechnic State University’s, Cal Poly’s, space environments laboratory features an …
-
Effects of Atomic Oxygen on the Vacuum-Induced Mass Loss Properties of a Variety of Spacecraft Materials
… of interest for this research are the vacuum and atomic oxygen (AO) environments. This project used the outgassing testing chamber and the AO chamber in the Cal Poly Space Environments lab to test multiple common spacecraft materials and determine whether AO affects the outgassing properties of …
-
Ab initio calculations of the electronic properties of the nickel oxide surface
… calculations are presented for the adsorption of atomic oxygen onto the nickel oxide (100) surface. The perfect surface is shown to be non-reactive, but enhanced binding is found for vacancy sites in the first two atomic layers. Of particular interest are a first layer cation vacancy and a second …
-
Laboratory Studies of Gas-Grain Processes on Cosmic Dust Analogues
… grain analogues in simulated ISM environments. Oxygen is the third most abundant element in the universe and is present in many astrobiologically important molecules. The desorption energy of atomic oxygen is a fundamental parameter that enters ISM models because it controls the residence time …
-
Efficient THz lasers and broadband amplifiers based on quantum cascade gain media
… feedback QC lasers aimed for 2.060 THz atomic oxygen line. THz travelling-wave QC amplifiers are highly desired to achieve broadband amplification of THz radiation in free space. The second part of the thesis focuses on the development of 4.3 THz travelling-wave QC amplifier by …
-
The adsorption of molecular oxygen on Au/Ni(111) alloys and its oxidation of CO at 85 K
Molecular oxygen is observed to adsorb on 0.2 - 0.6 ML Au/Ni(111) surface alloys. Molecular oxygen adsorbates are characterized by their 0-0 stretching frequencies of 740 cm', 851 cm' and 962 cm', as measured by high resolution electron energy loss spectroscopy (HREELS). The concentrations and …
-
Acoustic-Gravity Wave Propagation Based on Solutions to the Generalized Multi-component Transport Equations
… physical transitions between molecular and atomic gases in the lower thermosphere. However, models with time-dependent composition have been shown to outperform commonly used models with fixed composition; these time-dependent effects have been included in a one-gas model by adding an …
Page 1 of 4