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Les composantes du développement économique visant l'emploi dans les régions moins favorisées : le cas des régions périphériques du QuébecPoulin, Martine January 2008 (has links)
Thèse numérisée par la Division de la gestion de documents et des archives de l'Université de Montréal.
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Role of mycorrhizas in the regeneration of arid zone plantsMcGee, P. A. (Peter Allan) January 1987 (has links) (PDF)
Bibliography: leaves 146-152.
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Les composantes du développement économique visant l'emploi dans les régions moins favorisées : le cas des régions périphériques du QuébecPoulin, Martine January 2008 (has links)
Thèse numérisée par la Division de la gestion de documents et des archives de l'Université de Montréal
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Economic evaluation of management strategies for cattle ranching in semi-arid regions.Tarr, Heather Lucy. January 2001 (has links)
Arid and semi-arid regions have increasingly become the subject of much research
and debate by scientists. By their very nature, these regions characteristically
exhibit extremes which complicate the implementation of effective management
strategies that ensure sustainable productivity and economic output. Namibia is
one such region where low and highly variable rainfall conditions and fluctuating
productivity pose a challenge to managers of commercial livestock enterprises,
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who seek to optimise economic benefits while controlling the negative effect on
herd production and income of unpredictable and unfavourable climatic events.
Various management approaches are proposed as a means of exploiting periods
of abundant productivity and so optimising income from herd production, while
controlling for the effects of drought conditions. To analyse the effects of these
various offtake strategies, a rainfall-driven plant-herbivore simulation model is
used. The model comprises components simul~tihg vegetation and herbivore
dynamics. The vegetation component incorporates soil moisture and nutrient
allocation to plant parts. The herbivore dynamics sub-model comprises age and
sex classes, population dynamics and animal energy requirements which govern
accumulated fat reserves. The model is adapted to account for climatic and
vegetation attributes specific to Namibia. An economic component including a
seasonal monthly price structure is developed, and a dynamic feedback governing
management decisions is incorporated.
The much debated issue of whether to maintain a constant stocking rate or to track
climatic variation by employing a variable stocking level is investigated, with the
performance of management strategies incorporating these approaches ranked
according to various factors, including annual returns, associated risk and annual
stock mortality. The economic consequences of the timing of offtake are
investigated, with the simulation of management strategies that implement destocking
in the face of anticipated drought conditions. A dynamic projection of
expected income allows the impact of forecasting potential economic gains on
decision-making to be analysed.
Results indicate that the performance of management strategies is not as
dependent on climatic and seasonal price variability as was originally expected,
with the application of a constant stocking level proving to be the most favourable
strategy in terms of economic gain and variability of income. Tracking climatic
variation by adapting stocking levels does not provide the improvement in
economic returns from a livestock production system that was anticipated,
although this approach is successful in effecting a significant reduction in annual
stock mortality. Further results show the sensitivity of income to the long-term
average stocking level characterising the management strategies investigated, as
well as to the elasticity of the underlying price structure.
The results of this study indicate that the implementation of management
strategies designed to track climatic variation does not offer significant economic
advantages over the application of a constant stocking approach. / Thesis (M.Sc.)-University of Natal, Pietermaritzburg, 2001.
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Role of mycorrhizas in the regeneration of arid zone plants / by Peter Allan McGeeMcGee, P. A. (Peter Allan) January 1987 (has links)
Bibliography: leaves 146-152 / 152 leaves : ill ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--Dept. of Plant Pathology, Waite Agricultural Research Institute, University of Adelaide, 1987
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Spectroscopic observations of the [lambda]630 nm thermospheric emission from Mawson, Antarctica, under daylight, twilight and night-time observing conditions / M.G. Conde.Conde, Mark January 1990 (has links)
Bibliography: leaves 194-212. / ix, 214 leaves : ill. (some col.) ; 31 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--University of Adelaide, Mawson Institute for Antarctic Research, 1991
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Economic analysis of biofuels production in arid regionsRuskin, Helen Ann Kassander. January 1983 (has links) (PDF)
Thesis (Ph. D. - Arid Lands Resource Sciences)--University of Arizona, 1983. / Includes bibliographical references (leaves 164-170).
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Woody debris and the effect on the predicted probability of lizard capture in Arcoona Creek, Gammon Ranges National Park, South Australia /Coventry, Ben January 1998 (has links) (PDF)
Thesis (Env. Mgt.(Hons.))--University of Adelaide, Dept. of Environmental Science and Management, 1998. / Bibliography: leaves 52-58.
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Les coccinelles algériennes (Coleoptera, Coccinellidae) : analyse faunistique et structure des communautés / Algerian ladybirds (Coleoptera, Coccinellidae) : a faunistic analysis and community structure studySaharaoui, Lounes 11 December 2017 (has links)
L'étude menée durant quatre années consécutives (2003-2007) a caractérisé écologiquement et faunistiquement le peuplement des coccinelles en Algérie. 48 espèces ont été répertoriées dont 46 sont des agents de lutte biologiques. Elles se répartissent dans huit sous-familles, 12 tribus et 23 genres. La richesse spécifique est très élevée dans les secteurs du nord d'Algérie. Cette zone est caractérisée par des bioclimats humide, sub-humide et semi aride regroupant 41 espèces. Elle est par contre très faible dans le secteur de l'Atlas saharien et le Sud algérien avec respectivement 12 et 16 espèces. L'étude des spécificités trophiques, spatiales et temporelles des principales espèces, nous a conduits à définir leurs niches écologiques dans les différents agro écosystèmes de l'Algérie. Ainsi, la distribution spatiale des espèces peut apparaître comme quelque chose de statique. Il s'agit en réalité d'un processus dynamique dont le moteur est la disponibilité d'habitat favorable qui abrite la proie préférentielle. La communauté de coccinelles fonctionne sur le principe de partage des ressources et les interactions entre espèces organisent la communauté en réseaux trophiques. L'analyse de la distribution des coccinelles à travers les différents secteurs géographiques montre que les espèces: C. septempunctata, H. variegata, S. punctillum et, H. argus présentent une forte valence écologique. En revanche, les espèces: P. ovoideus, P. numidicus, E. pubescent forme apicalis, H. marmottani, et Pullus sp semblent être spécifiques aux régions sahariennes et plus particulièrement au Sahara septentrional. / The study led during four consecutive years (on 2003-2007) shed light on the species composition, and habitat characteristics of the communities of ladybirds in Algeria. 48 species were listed among which 46 are biological control agents. They divide up in 8 sub-families, 12 tribes and 23 genera. The specific richness is very high in the sectors of the North of Algeria (41 species). This zone is characterized by bioclimates wet, sub-wet and semi-dry grouping. It is very low on the other hand in the sector of the Saharan Atlas and the Algerian South with respectively 12 and 16 species. The study of trophic interactions, spatial and temporal distribution of the main species, led us to define their ecological niches in the various agro-ecosystems of Algeria. So, the spatial distribution of the species can appear as something static. It is in reality a dynamic process the engine of which is the availability of favorable habitats that shelter ladybird preferential prey. Communities of ladybird works on the principle of division (sharing) of the resources and the interactions between species organize the community in trophic networks. The analysis of the distribution of ladybirds through the various geographical areas shows that the C. septempunctata, H. variegata, S. punctillum, and, H. argus present strong ecological valence. On the other hand, P. ovoideus, P. numidicus, E. pubescens forme apicalis, H. marmottani, and Pullus sp are specific to the Saharan regions and more particularly to northern Sahara.
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Paradiplomacie regionů v EU / Paradiplomacy of the Regions in the European UnionNovák, Ondřej January 2008 (has links)
This paper deals with the new phenomenon of international relations - the foreign relations of subnational units. It describes it in the framework of new regionalism and in the concept of paradiplomacy. It analyses the main channels of regional representation at the level of European Union: the Committee of Regions, the European Commission, the Council of ministers, the European parliament, regional representation offices and transnational associations. At the end, the paper focuses on examples of Flandern, Baden-Würtemberg, Burgundy, Voivodship of Opole and Central Bohemian region.
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