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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 67 for “"multiwavelength"”.
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Integrated Multiwavelength Semiconductor Lasers
The next technical challenge is to increase the number of lasing modes with as much control over the wavelength and linewidth as in today's single-wavelength semiconductor lasers. By utilizing multiple sections of periodic structures, dual-wavelength InGaAs-GaAs ridge waveguide semiconductor lasers …
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Multiwavelength studies of classical novae
… developments. Therefore, carrying out detailed multiwavelength studies of individual novae is important to provide an holistic picture of the eruption development with the ultimate aim of a general understanding of the physical mechanisms involved in nova eruptions, as well as the structure and …
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Multiwavelength Studies of Rotating Radio Transients
Seven years ago, a new class of pulsars called the Rotating Radio Transients (RRATs) was discovered with the Parkes radio telescope in Australia (McLaughlin et al., 2006). These neutron stars are characterized by strong radio bursts at repeatable dispersion measures, but not detectable using …
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Stable multiwavelength erbium-doped random fiber laser
Multiwavelength fiber lasers which consist of equally-spaced frequency components have found many applications and that includes as light sources for optical communication systems. One of the techniques available to generate such multiple wavelengths is random fiber lasers. Despite simplicity in …
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Classification of multiwavelength transients with machine learning
… (LSST), we are entering a golden era of multiwavelength transient astronomy. The large MeerKAT science project ThunderKAT may dramatically increase the detected number of radio transients. Currently radio transient datasets are still very small, allowing spectroscopic classification of …
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Multiwavelength studies of accretion disks around compact objects
(cont.) to the XPS in SNR RCW 103. The multiple IR band measurements of 1E 1048.1-5937 provide marginal evidence for spectral flattening, and cannot rule out an accretion disk scenario for AXPs.
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External Cavity Multiwavelength Semiconductor Mode-locked Laser Gain Dynamics
… mode-locked lasers can be configured as multiwavelength pulse sources and are good candidates for time and wavelength division multiplexing applications. The gain medium in external cavity semiconductor mode-locked lasers is a semiconductor optical amplifier (SOA), and passive and hybrid …
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Multiwavelength behaviour of Cygnus X-3 and related objects
… In order to address the broader picture, a multiwavelength comparison of Cygnus X-3 with other ‘radio-jet’ X-ray binaries is also undertaken. Infrared observations of Cyg X-3 at high time resolution reveal many rapid flare events superimposed upon the 4.8 hr (presumed) orbital motion. …
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A microprocessor based multiwavelength-detector system for liquid chromatography
A multiwavelength-detector system for liquid chromatography was constructed using a state-of-the-art microprocessor and silicon linear photodiode array. By using a microprocessor, the control, data acquisition and data manipulation functions were alterable and flexible towards the optimization of a …
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Multiwavelength Study of Photodissociation Regions and a Near -Infrared Imager
In this thesis, observations of photodissociation regions (PDRs) in the millimeter, far-infrared, and near-infrared wavelength regimes are interpreted in the context of PDR theory. Three modifications to the standard Tielens & Hollenbach PDR model are considered. The first modification adds …
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The automated detection and multiwavelength properties of LADUMA HI galaxies
In this study, we investigate the neutral atomic hydrogen (HI) and star formation history (SFH) properties of 104 low redshift (0 < zHI < 0.088) galaxies from the Looking At the Distant Universe with the MeerKAT Array (LADUMA) survey. LADUMA is a deep and narrow HI emission survey underway with the …
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Multiwavelength Surface Plasmon Resonance Sensor Designs for Chemical and Biochemical Detection
Surface plasmon resonance (SPR) sensors using multiwavelength light coupling are investigated to probe changes in refractive index that occur as a result of chemical or biochemical processes. Traditional SPR sensors have used angle modulation to facilitate detection at the sensor surface; however, …
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A Multiwavelength Analysis of the Effect of Cluster Environments on Galaxy Evolution
In this work, we present analysis to constrain the role of local environment on galaxy evolu- tion. The hot, dense galaxy cluster environment is utilized as a comparative laboratory to galaxies that reside in the less dense field where it is ‘alone’. Within clusters, the buildup of red, passive …
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Design, Development, Characterization, and Application of the DRI Model 2015 Multiwavelength Carbon Analyzer
A multiwavelength thermal/optical carbon analyzer (DRI Model 2015) equipped with a novel seven-wavelength light source (405, 445, 532, 635, 780, 808, and 980 nm) was developed to analyze chemical and optical properties of carbonaceous particles collected on quartz-fiber filters. Built upon on the …
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Multiwavelength variability of black hole x-ray binaries in the low/hard state
The behaviour of black hole X-ray binaries can be classified into five spectral states which are defined in terms of the X-ray spectral and timing properties of the source. These states show distinct and observable characteristics and transitions from one state to another often take place. Perhaps …
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A multiwavelength analysis of M31's globular clusters and their low mass X-ray binaries
A multiwavelength analysis of M31’s globular clusters and their low mass X-ray binaries by Mark B. Peacock Globular clusters (GCs) are dense groups of thousands to millions of stars. They are often very old systems with ages similar to those of their host galaxies and the early Universe. These …
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The impact of brillouin pump pre-amplification on multiwavelength brillouin-erbium fiber laser in linear cavity
Multiwavelength Brillouin Erbium Fiber Lasers (BEFLs) gain interest in recent decades due to their inherent characteristics such as narrow linewidth, high optical power and single frequency. Generation of multiple wavelengths is realizable through combination of Brillouin and Erbium-Doped Fiber …
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