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Université de Neuchâtel

Numerical methods for estimating linear econometric models

Foschi, Paolo ; Nägeli, Hans-Heinrich (Dir.) ; Kontoghiorghes, Erricos John (Codir.)

Thèse de doctorat : Université de Neuchâtel : 2003 ; 1746.

The estimation of the Seemingly Unrelated Regressions (SUR) model and its variants is a core area of econometrics. The purpose of this thesis is the investigation and development of efficient numerical and computational methods for solving large-scale SUR models. Specifically, its aim is twofold: firstly to continue past successful research into the design of numerically efficient methods for...

Université de Neuchâtel

Algorithms for solving statistical model selection problems

Gatu, Cristian ; Erard, Pierre-Jean (Dir.) ; Kontoghiorghes, Erricos John (Codir.)

Thèse de doctorat : Université de Neuchâtel : 2004 ; 1744.

Statistical model selection problems arises in diverse areas. Some of the selection methods have exponential complexities and thus, are computationally demanding. The purpose of this thesis is to propose computationally efficient and numerical reliable algorithms used in statistical model selection. Particular emphasis is given to the computationally intensive model selection strategies which...

Université de Neuchâtel

A conceptual model of flow and transport in a karst aquifer based on spatial and temporal variations of natural tracers

Perrin, Jérôme ; Zwahlen, François (Dir.) ; Jeannin, Pierre-Yves (Codir.)

Thèse de doctorat : Université de Neuchâtel : 2003 ; 1699.

Karst aquifers represent an important groundwater resource world-wide. They are highly vulnerable to contamination due to fast transport through the system and limited attenuation of contaminants. The two main hydrogeological approaches developed for studying flow and transport are: inference of the system structure from karst spring hydrographs and chemographs; numerical modelling of flow and...

Université de Neuchâtel

Geometry and hydraulic parameters of karst aquifers : a hydrodynamic modeling approach

Kovács, Attila ; Perrochet, Pierre (Dir.) ; Jeannin, Pierre-Yves (Codir.)

Thèse de doctorat : Université de Neuchâtel : 2003 ; 1724.

This thesis presents a method for characterizing flow systems in karst aquifers by acquiring quantitative information about the geometric and hydraulic parameters of a karst conduit network from spring hydrograph analysis. The investigation method applied consisted of constructing simple conceptual models of karst systems, and deducing analytical formulae describing the connection between aquifer...

Université de Neuchâtel

Virus transport and attenuation in Perialpine Gravel Aquifers

Flynn, Raymond Matthew ; Zwahlen, François (Dir.) ; Hunkeler, Daniel (Codir.)

Thèse de doctorat : Université de Neuchâtel : 2003 ; 1720.

Pollution of groundwater by microbiological contaminants (bacteria, viruses and protozoa) is a widespread problem in the United States and Europe. Gravel aquifers, which form an important drinking water resource in many parts of Central Europe, may be highly vulnerable to this type of contamination. Due to the smaller size and perceived greater mobility, studies of microbiological contaminant...

Université de Neuchâtel

Deterministic models of groundwater age, life expectancy and transit time distributions in advective-dispersive systems

Cornaton, Fabien ; Perrochet, Pierre (Dir.)

Thèse de doctorat : Université de Neuchâtel : 2003 ; 1731.

The main objective of this dissertation consisted in the elaboration of a methodology to determine reservoir groundwater age, life expectancy, and transit time probability distributions in a deterministic manner, considering advective-dispersive transport in steady velocity fields. In the first section, it is shown that by modelling the statistical distribution of groundwater age at aquifer scale...

Université de Neuchâtel

Analyse de tannins inhibiteurs de la stilbène oxydase produite par Botrytis cinerea Pers.: Fr

Perret, Camille ; Tabacchi, Raphaël (Dir.)

Thèse de doctorat : Université de Neuchâtel : 2001 ; 1591.

Grey mould is one of the most important diseases of grapes. Flowering clusters are infected by the fungus Botrytis cinerea, but it does not develop until ripening. This latency is probably maintained by an unfavourable environment, corresponding to the production of phytoalexins (resveratrol (1), pterostilbene (2) and e-viniferin (3)). Some varieties, as Gamaret, are very resistant to the fungus...

Université de Neuchâtel

Les complexes arène-ruthénium et polyoxométallates : un lien entre la chimie organométallique et la chimie inorganique

Garcia Fidalgo, Eva ; Süss-Fink, Georg (Dir.)

Thèse de doctorat : Université de Neuchâtel : 2001 ; 1588.

The first part of this work refers to the complexes arene-ruthénium. since their discovery in 1967 by Winkhaus and Singer, the dinuclear arene-ruthenium complexes [(n6 -arène)RuCI2]2, erroneously considered as polymers in the beginning, have been widely used in organometallic chemistry. Very often used in synthesis and homogeneous catalysis, they are easily accessible and perfectly air-stable....