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 14 of 14 for “"HOMs"”.
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Landscapes of Burial? The Homs Basalt, Syria in the 4th-3rd millennia BC
In the basaltic landscape of the Homs region, there exist thousands of hitherto unrecognized burial cairns and settlements provisionally dated to the 4th-3rd millennia BC. They represent a unique opportunity to analyze a largely extant archaeological record of human activity, which contrasts with …
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Investigation of Bragg Gratings in Few-Mode Fibers with a Femtosecond Laser Point-by-Point Technique
The higher-order modes (HOMs) of an optical fiber has been demonstrated as a new dimension to transmitting signals with the development of mode-division multiplexing (MDM) technique. This dissertation aims to explore the HOMs as an extra degree of freedom for device innovation. In particular, with …
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PARTICLE-WATER INTERACTIONS OF HYDROPHOBIC ORGANIC MICROPOLLUTANTS IN MARINE SYSTEMS
… of hydrophobic organic micropollutants (HOMs) is of paramount importance to water quality managers because of their toxicity, persistence, and liability to bioaccumulate. In this study, the role played by the main estuarine variables (organic matter, suspended particulate matter [SPM], …
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Photonic band gap structures for superconducting radio-frequency particle accelerators
… unwanted Higher-Order electromagnetic Modes (HOMs) in the structure. Strong HOM damping is highly desirable for SRF cavities because it increases maximum achievable beam current by reducing the negative effect that HOMs have on the propagating electron beam. In the presented structure, …
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Experimental study of photonic band gap accelerator structures
… of TeV linear colliders. In this work, PBG HOMs are studied theoretically and experimentally for the first time. PBG HOMs are shown in simulation to be low Q lattice modes, removed from the cavity defect and beam position. Direct wakefield measurements were made in hot test using the bunch …
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Improving the understanding of the influence of emissions of biogenic volatile organic compounds on climate.
… of highly oxygenated organic molecules (HOMs) from α-pinene is presented, representing a new way for BVOCs to influence climate and the first semi-explicit HOM mechanism suitable for climate models. The α-pinene-HOM mechanism captures experimentally observed dependencies of HOMs on …
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Atmospheric sub-10 nm aerosol number size distributions : measurement, analysis and implications
… sulfuric acid and highly oxygenated molecules (HOMs) can participate in NPF in the boreal forest and discovered that in Po Valley the sulfuric acid clusters are likely stabilized by bases after which HOMs participate in the growth of the particles alongside sulfuric acid and bases. Overall, this …
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Experimental studies of hybrid photonic band gap accelerator structures
… mode, thus damping higher-order modes (HOMs) generated by wakefields. We have designed, built and successfully tested a 17.14 GHz hybrid PBG (HPBG) structure containing both dielectric and metallic elements. Dielectric elements have low loss and the potential to survive high surface …
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Experimental studies of multipass beam breakup and energy recovery using the CEBAF injector linac
… high Q of the cavity higher-order modes (HOMs). The CEBAF accelerator, which employs five pass recirculation through two superconducting linacs to accelerate high CW current (up to 200 $\mu$A), poses unique instability problems. An experimental investigation of multipass BBU at CEBAF has …
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Experimental studies of multipass beam breakup and energy recovery using the CEBAF injector LINAC
… high Q of the cavity higher-order modes (HOMs ). The CEBAF accelerator, which employs five pass recirculation through two superconducting linacs to accelerate high CW current (up to 200 pA), poses unique instability problems. An experimental investigation of multipass BBU at CEBAF has been …
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Mode conversation losses in overmolded millimeter wave transmission lines
… considered the problem of higher order modes (HOMs) mixed with an HE11 input entering the miter bend. Using a numerical technique, we found that the loss through the miter bend is dependent on both the amplitude of the HOM content as well as its phase relative to the phase of the HE11 mode. …
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Miter bend loss and higher order mode content measurements in overmoded millimeter-wave transmission lines
… mode on the phase of higher order modes (HOMs) was investigated. In addition, the propagation of a multi-mode beam after the waveguide was quantified, and it was shown that if two modes with azimuthal (m) indices that differ by one propagate in the waveguide, the resultant centroid and the …
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An inductive approach to ω-categories and their computads
… of an ω-category, and to prove that the homs of a computad are computads. We then show that our definition of ω-category agrees with that of Batanin and Leinster. In the final part of the thesis, we generalise our inductive approach to other higher structures. We introduce a notion of …
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Atmospheric Chemistry of Volatile Organic Compounds: Oxidation Products, Mechanisms and Secondary Organic Aerosol Formation
The results from this work are a piece in understanding the complex puzzle of atmospheric aerosol formation. Secondary organic aerosol (SOA) formed by the oxidation of volatile organic compounds (VOC) in the atmosphere is a key component of air pollution with a strong negative impact on human …