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 125 for “"water vapour"”.
-
Sensing atmospheric water vapour using the global positioning system
Atmospheric water vapour measurements are of importance to meteorologists, radio astronomers and geodesists. Precipitable water vapour (PWV) is a greenhouse gas to be reckoned with in numerical weather models and climate change studies, it is a nuisance in centimetre-wavelength radio astronomy and …
-
Timescales of processes controlling water vapour entry to the stratosphere
… representation of the key processes determining water vapour entry into the stratosphere in reanalysis and two global climate model configurations. This is done by applying the advection-condensation method and comparing alternative formulations. In the region of the atmosphere around 15–50 km …
-
The estimation of precipitable water vapour from GPS measurements in South Africa
… possible to estimate the amount of precipitable water vapour (PWV) in the atmosphere. The application of the GPS data for the estimation of PWV in the atmosphere is not a new concept and has been described in numerous publications and reports since the early 1990's (Bevis et al., 1992, Rocken et …
-
Effect of water vapour on growth and adherence of chromia scales on pure chromium
… were used, to allow the effects of oxygen and water vapour partial pressures to be determined. It was shown that the oxide scale formed in Ar-O2 environments was dependent on the oxygen partial pressure. Decreasing the pO2 in such gas mixtures lowered the oxidation rate and improved scale …
-
Ecosystem-atmosphere exchange of carbon dioxide and water vapour in typical East-Asian croplands
… change on ecosystem-atmosphere exchange of heat, water vapour and carbon dioxide if crop species planted or irrigation management is changed in croplands. Improvement of the Penman-Monteith model to simulate evapotranspiration and light-response model to simulate carbon dioxide flux for croplands …
-
Heat transfer and condensation of water vapour from humid air in compact heat exchangers
… and simulation study of heat transfer in water-to-air compact-plate heat exchanger is presented. A compact-plate heat exchanger made of polypropylene, in which flow pattern is maintained as counter-current, was constructed to conduct the experiments. Experiments were conducted for …
-
Atmospheric water vapour tomography for DInSAR application and effect of volcanic plume on the microwaves
A particular synergy among GPS and SAR techniques, to improve the precision of the current ground deformation monitoring techniques,is investigated. The study of atmospheric anomalies in the GPS EM waves propagation is useful to extrapolate information about the wet refractivity ?eld. Because of …
-
Water vapour transport from the South Atlantic and Indian Oceans and summer rainfall in southern Africa
… over southern Africa is examined through zonal water vapour transport. Along the west coast, variations in intensity and latitudinal position of the South Atlantic anticyclone/modulations of the westerly flow that penetrates from the tropical Atlantic, contribute the most about 25% and 11% of …
-
Improved Desiccant Coatings for Heat and Water Vapour Transfer on the Matrix Surfaces of Air-To-Air Regenerative Wheels
… and buildings; however, the effectiveness of water vapor exchange in these regenerative wheels appears to be much lower than may be economically feasible. The purpose of this research is to investigate the feasibility of using agglomerated desiccant particle coatings to improve the performance …
-
Determination of the suitability of MT Gamsberg in Namibia for millimetre wave stronomy by measurements of the precipitable water vapour
Precipitable Water Vapour (PWV) is the amount of water vapour in the atmospheric column above a location equivalent to the amount of liquid precipitation that would result if all the water vapour in the column was condensed. Water vapour is the main source of opacity in the Earth’s atmosphere at …
-
The atmosphere above Mauna Kea at mid-infrared wavelengths
… compromised by rapid variations of atmospheric water vapour content that distort the phase coherence of incoming celestial signals. Unless corrected, these phase distortions, which vary rapidly with time and from antenna to antenna, seriously compromise the sensitivity and image quality of these …
-
A stabilized master laser system for differential absorption LIDAR.
In this thesis, we present a prototype water vapour DIfferential Absorption Lidar (DIAL) instrument with accurate and precise wavelength control of master diode lasers. This stabilization system design has a number of novel elements that work towards a robust and low-cost autonomous DIAL …
-
Atmospheric correction of New Zealand Landsat imagery : a thesis presented in partial fulfilment of the requirements for the degree of Master of Philosophy in Earth Science at Massey University
… Data for one year were downloaded for aerosols, water vapour and ozone and trends of this data were studied. The sensitivity of retrieved reflectance of several targets to changes in the atmospheric components as seen in the MODIS data were also analysed. Several methods were developed for using …
-
Application of optical and infrared remote sensing to the retrieval of selected land and sea features
… The basis for this work is the Dynamic Water Vapour method developed by Steyn-Ross et al. [1993], Smith [1993]. Two new methods are proposed in this thesis: The Dynamic Water Vapour or Atmospheric Temperature (DWVT) and the Simultaneous Water Vapour and Atmospheric Temperature (SimWVT). …
-
Temporal Variations of delta 2 H, delta 18 O and Deuterium Excess in Atmospheric Moisture and Improvements in the CO 2 -H 2 O Equilibration Technique for 18 O/ 16 O Isotope Ratio Analysis
… isotope ratios D/H and 18O/16O in atmospheric water vapour collected at the Central European site Heidelberg (49° 25’ N and 8° 41’ E) is analysed. Its basic features, such as seasonal variations of D/H and 18O/16O, are discussed and compared with the isotope composition of precipitation. The …
-
Recrystallisation Of Strontium Titanate
… is dramatically enhanced by thermal annealing in water vapour as compared with a dry ambient. Time resolved optical reflectivity (TRR) has been combined with Rutherford backscattering spectrometry (RBS) and ion channelling to investigate this effect. Thin amorphous films were produced on single …
-
The blending and permeability of polymers for packaging applications
… prepared, to develop a material with optimal water vapour and oxygen barrier properties. The effect of compatibilizers on phase dispersion has been investigated using three commercial Polybond's, PB3002, PB1001, and PB3009. Three compatibilizers prepared in-house were also used as, maleic …
-
Radon, progeny and health: investigation in different environments in Northamptonshire
… results from the diurnal variation in ambient water vapour pressure. And that the seasonal variation in radon, arises from the changes in the range of this diurnal variation during the course of a year brought about by changing levels of temperature and barometric pressure. This will be varied …
Page 1 of 7