899 resultados para NORTHERN GONDWANA
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Comprehensive Annual Financial Report For University of Northern Iowa.
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Comprehensive Annual Financial Report For University of Northern Iowa.
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Comprehensive Annual Financial Report For University of Northern Iowa.
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Comprehensive Annual Financial Report For University of Northern Iowa.
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Report on a special investigation of the University of Northern Iowa International Dance Theatre for the period December 1, 2005 through February 28, 2014
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Abstract
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An old erg covers the northern part of the Lake Chad basin. This dune landform allowed the formation of many inter- dune ponds of various sizes. Still present in certain zones where the groundwater level is high (e.g. Kanem, southern Manga), these ponds formed in the past a vast network of lacustrine microsystems, as shown by the nature and the dis- tribution of their deposits. In the Manga, these interdune deposits represent the main sedimentary records of the Holo- cene environmental succession. Their paleobiological (pollens, diatoms, ostracods) and geochemical (δ18O, δ13C, Sr/ Ca) contents are often the basis for paleoenvironmental reconstruction. On the other hand, their sedimentological char- acters are rarely exploited. This study of palustro-lacustrine deposits of the Holocene N'Guigmi lake (northern bank of the Lake Chad; Niger) is based on the relationships between the sedimentological features and the climato-hydrological fluctuations. The mineralogical parameters (e.g. calcium carbonate content, clay mineralogy) and the nature of autoch- thonous mineralization (i.e. amorphous silica, clays, calcium carbonates) can be interpreted using a straightforward hy- dro-sedimentary model. Established to explain the geochemical dynamics of Lake Chad, this model is based on a bio- geochemical cycle of the main elements (i.e. silicium, calcium) directly controlled by the local hydrological balance (i.e. rainfall/evaporation ratio). All these results show that a detailed study of sedimentological features can provide impor- tant paleohydrological informations about the regional aridification since ca 6500 14C BP.
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Report on the University of Northern Iowa, Cedar Falls, Iowa for the year ended June 30, 2014
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Report on a special investigation of the University of Northern Iowa, College of Education – Curriculum and Instruction Department for the period January 1, 2012 through October 31, 2014
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Report on a review of selected general and application controls over the University of Northern Iowa Facility Administration and Maintenance Information System for the period April 29, 2014 through June 5, 2014
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Audit report of the University of Northern Iowa, Cedar Falls, Iowa, as of and for the years ended June 30, 2015 and 2014