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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
781

Eutrophication: a mathematical model

Friedman, Joel Herbert, 1949- January 1973 (has links)
No description available.
782

A scheduling system for elective medical procedures

Rankin, William Benford, 1943- January 1974 (has links)
No description available.
783

Application of chance-constrained programming to the multi-period capital budgeting problem under risk

Herrero, Jesus, 1942- January 1974 (has links)
No description available.
784

An economic analysis of supply response in the California-Arizona lemon industry

Ribyat, Kenneth Martin January 1979 (has links)
No description available.
785

Non-disturbing methods of estimating trace gas emissions from agricultural and forest sources

Kaharabata, Samuel K. January 1999 (has links)
Two approaches, one using an atmospheric diffusion model and the other an atmospheric tracer, were used to predict the source strength of trace gases from observations of the downwind concentration field. Both approaches do not disturb the prevailing environmental and physical conditions nor the existing biogenic processes. An analytical solution to the advection-diffusion equation was used to back-calculate the source strength from the downwind concentration measurements of (i) single and multipoint (4 and 16 points) trace gas (sulphur hexafluoride (SF6) and methane (CH4)) release experiments conducted over microplots over an open field, and (ii) single point source SF6 release experiments conducted over a forested terrain. Best predictions of the source strength (to within +/-20%) were obtained from concentration observations made along the centreline of the diffusing plumes with the predictions improving when observations at the mean plume height were used. The diffusion model was then used to compute footprint estimates for neutral and unstable conditions, for tower and aircraft based observation platforms above the forest. They showed spatially constrained footprints in the surface layer, due to effective vertical coupling, so that observations from towers and low flying aircraft must be expected to be very site specific, and scaling up to larger areas will have to be done with careful consideration of surface mosaics. Above-canopy sampling of trace gases to determine volatile organic compound emissions were then interpreted in terms of footprint considerations. This was accomplished by defining the upwind canopy areas effectively sampled under the given wind and stability conditions. The analysis demonstrated, for example, that the variability observed in measured isoprene fluxes could be accounted for by varying numbers of randomly distributed clumps of emitter species within a varying footprint. It suggested that heterogeneity of the forest canopy, in ter / Sulphur hexafluoride was also used as an atmospheric tracer in order to estimate CH4 emissions from manure slurry and cattle housed in barns and feedlots. (Abstract shortened by UMI.)
786

A model of the neuronal encoding mechanism for studying neural systems.

Varano, Vincent. January 1973 (has links)
No description available.
787

Termes non-linéaires de l'équation de termodynamique pour la circulation asymétrique moyenne générale de janvier 1979

Gravel, Sylvie. January 1983 (has links)
No description available.
788

Ondes baroclines longues forcées par un échauffement local

Gauthier, Pierre. January 1982 (has links)
No description available.
789

Stability of the market model beta coefficient : effects of information

Riding, Allan Lance. January 1982 (has links)
The Single Factor market Model is an important tool in contemporary research in finance. The assumption of parametric stability is usually invoked to facilitate statistical estimation of the model. Much of the importance of the model follows from its "beta" parameter which, ideally, measures the sensitivity of returns on a security to changes in a market factor. While stability of this parameter is desirable, this property is neither required nor expected from financial theory. Instances of nonstationarity are commonly observed. The objective of this thesis is to address, theoretically and empirically, the nature and causes of potential instability. To this end, analytical models are derived for the beta parameter. These models predict that the intertemporal behaviour of parametric estimates is characterized by information-related structural shifts and seemingly random perturbations. These predictions are given empirical support. Structural shifts are observed in conjunction with pre-selected information flows; a random component of the beta parameter is identified. The implications of these findings are considered.
790

Cauchy interpolation for multi-variate and multi-derivative data

Kaufman, Jonathan, 1981- January 2007 (has links)
There is often a need to interpolate data that is obtained through experiment or computational analysis, because the data is difficult or expensive to obtain. An example is the scattering parameters of microwave devices, obtained through computationally intensive finite element (FE) analysis. Cauchy interpolation is an established solution to this problem. In this thesis it is extended to interpolate data over a multi-parameter space, when the data available includes not just the function to be interpolated, but also its derivatives with respect to each parameter. The finite element method (FEM) provides such derivatives. The new algorithm is applied to a simple RLC circuit test case, and to real data from a 3D FE analysis of a rectangular waveguide component, in a 4-parameter space. Results show the effectiveness of the approach taken.

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