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 20 of 24 for “"CRDS"”.
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Adjudication of child relocation disputes in South Africa
… the adjudication of child relocation disputes (CRDs) in South Africa. The central thesis is that judges require adequate legislative guidance when exercising their discretion in CRDs. At present, judges adopt widely different reasonings when adjudicating CRDs and this has led to inconsistent …
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Characterisation of a Cavity Ring-Down Spectrometer for measuring CO2, CH4, delta13CO2, and delta13CH4 in ambient air
… and sinks. The Cavity Ring-Down Spectrometer (CRDS) G2201-i measures 12CO2, 13CO2, 12CH4, 13CH4, and H2O continuously and simultaneously in a gas sample. In this thesis, the CRDS G2201-i has been installed in Heidelberg for routine ambient air analysis and for measurements of highly …
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Continuous-wave cavity ring down spectroscopy sensor for Hall thruster erosion measurement
… wave cavity ring down Spectroscopy (CW-CRDS) as a diagnostic tools to study the sputter erosion process for Hall thrusters. Two CW-CRDS erosion sensors have been developed for in situ monitoring of sputtered manganese (Mn) and BN. As a stepping stone towards BN detection, a Mn erosion …
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Cavity Ringdown Spectroscopy in Nitrogen/Oxygen Mixtures in the Presence of Alpha Radiation
… effects. Cavity Ringdown Spectroscopy (CRDS) was used to measure the concentration of chemical products generated as a result of radiation interactions in a controlled atmosphere. Experiments were conducted in a vacuum chamber interfaced with a gas introduction system that controlled the …
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Biophysical Studies of Pathogen Recognition by C-Type Lectins
… presents the carbohydrate recognition domains (CRDs) in a cluster of the C-terminus. The neck consists of identical domains that vary in number resulting in various polymorphic forms. The lectins selectively bind to specific oligosaccharide structures on pathogen surfaces through the CRDs. …
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Elucidating the chemistry of particulate and chlorinated nitrates in the troposphere through method development, and chamber and field studies
… dissociation cavity ring-down spectroscopy (TD-CRDS) was developed. At inlet temperatures of 540 °C and 620 °C, respectively, scatter plots of SMPS volume distribution data and TD-CRDS mixing ratios correlated (r2>0.9) with unity slopes in laboratory experiments. Sample ambient air measurements …
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Indirect Detection of Explosive Vapours by Thermal Dissociation Cavity Ring-Down Spectroscopy
… The catalytic thermal dissociation (cTD) CRDS was found to have a (1s, 3σ) limit of detection (LOD) of 0.5 ppbv. The LOD was sufficient for the detection of TNT in ambient air but lacked the sensitivity to detect less volatile nitro aromatic explosives such as 2,4,6 …
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The Relationship of Physical Activity and Sport Participation to Body Image in Older Adults
… affective BI, the Contour Rating Drawing Scale (CRDS) measured cognitive BI, and the Body Image Avoidance Questionnaire (BIAQ) measured behavioral BI. The Body Satisfaction Scale (BSS) measured satisfaction with appearance and functionality, and grip strength was used as a measure of body …
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Novel diode laser absorption techniques for combustion diagnostics
… method is Cavity Ring-Down Spectroscopy (CRDS). CRDS uses a cavity constructed of highly reflecting mirrors, laser light is then coupled into this cavity and absorption measurements can be evaluated from the decay rate of light from the cavity. The design and, novel application of …
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Graphical Tools, Incorporating Cost and Optimizing Central Composite Designs for Split-Plot Response Surface Methodology Experiments
… experiments, completely randomized designs (CRDs) are impractical due to restrictions on randomization, or the existence of one or more hard-to-change factors. Under these situations, split-plot experiments are more realistic. The two separate randomizations in split-plot experiments lead to …
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Effects of galectins and antibodies in HIV infection; Novel Assays
… with two carbohydrate recognition domains (CRDs), had high affinity for gp120 as well as the HIV receptor CD4. The N-terminal CRD mediated the strongest interaction with gp120. The results of the FAassay correlated well with binding of whole virions screened in another assay against the same …
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Laser-induced plasmas in air for pulsed broadband cavity-enhanced absorption spectroscopy
… through (i) time-dependent cavity ring-down (CRDS), and (ii) intensity-dependent incoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS) methodologies. Based on the broadband ring-down time of light within the cavity, cavity mirror reflectivities may be calibrated in situ, thus …
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Supercontinuum radiation for ultra-high sensitivity liquid-phase sensing
… broadband cavity ring-down spectroscopy (BB-CRDS), was successfully developed. Use of a novel single-photon avalanche diode (SPAD) array enabled the simultaneous detection of ring-down events at multiple spectral positions for BB-CRDS measurements. The performance of both techniques is …
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Plasma Dynamics in a High-Power Helicon Source
… temperatures, Cavity Ring-Down Spectroscopy (CRDS) for direct negative ion density measurements, and an absolute intensity calibrated Optical Emission Spectroscopy (OES) method in conjunction with the YACORA Collisional Radiative Model and an extended global model. OES is used to determine …
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Plasma Dynamics in a High-Power Helicon Source
… temperatures, Cavity Ring-Down Spectroscopy (CRDS) for direct negative ion density measurements, and an absolute intensity calibrated Optical Emission Spectroscopy (OES) method in conjunction with the YACORA Collisional Radiative Model and an extended global model. OES is used to determine …
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Development, Validation, and Application of Methods for High Time-Response Measurement of Gaseous Atmospheric Chlorinated Species
… a commercial HCl cavity ring-down spectrometer (CRDS) for sampling HCl in the ambient atmosphere and developed validation techniques to characterize the measurement uncertainties. The HCl analyzer was used to make continuous HCl measurements in the polluted marine boundary layer during the …
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Spectroscopic investigations of the X and A state dynamics of ¹³C₂H₂
… (DF), Cavity Ring-Down Spectroscopy (CRDS), Noise Immune Cavity Enhanced Optical Heterodyne Molecular Spectroscopy (NICE-OHMS) and Stimulated Emission Pumping (SEP) are employed to study the spectroscopy and dynamics of acetylene. All of these experiments focus on 13C2H2 instead of …
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Laserspektroskopische Bestimmung absoluter Konzentrationen von CN- und NH 2 -Radikalen in NO-dotierten Niederdruck-Wasserstoffflammen während der Verbrennung von Graphit
… mit Hilfe der cavity ring-down spectroscopy (CRDS) und die NH2-Konzentrationen mittels der intracavity laser absorption spectroscopy (ICLAS) gemessen. Die Temperaturen wurden über laserinduzierte Fluoreszenz (LIF)Anregungsspektren von OH-Radikalen ermittelt. Die CN-Profile wurden mit …
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Chamber investigations of atmospheric mercury oxidation chemistry
… USA. The chamber was built around an existing Hg CRDS system that could measure Hg concentrations in the chamber of<100 ngm−3 at 1 Hz enabling reactions to be followed. The main oxidant studied was bromine, which was quantified with a LED based CEAS system across the chamber. Hg oxidation in the …
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Development of a method for estimating methane gas emissions at high resolution
… uses a Picarro cavity ring down spectroscopy (CRDS) instrument. The UK Met Office's NAME dispersion model is used within InTEM to represent the physical atmospheric processes which occur throughout this period. Methane concentrations are shown to vary over different time frames and are …
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