- About
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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.
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Showing 331 to 335 of 335 (0.105 seconds)Spelling suggestions: "subject:"bond"" "subject:"fond""
| 331 |
Festlegung von Radionukliden und Arsen in Feuchtgebieten an Bergbaualtstandorten – Ein Beitrag zur Passiven WasserreinigungDienemann, Holger 28 February 2008 (has links)
Im Abstrom von Uranbergbauobjekten (Sachsen, Deutschland) wurden Uran, Radium-226 und Arsen in unterschiedlichen Feuchtgebieten untersucht. Dabei wurden Wasser (vor¬wiegend neutrale bis leicht basische pH-Werte), Sedimente und im Wasser befindlicher Bestandesabfall (CPOM) beprobt. Zur Klärung der Genese der Urangehalte im Sediment erfolgten Untersuchungen an Pb-Isotopen. Sie zeigen u. a., dass das Uran in den obersten Zentimetern des Sediments (organische Auflage) aus der wässrigen Phase und nicht von ca. 300 Millionen Jahre alten Erzteilchen stammt. Für die Verlagerung von Radionukliden und Arsen aus dem Wasserkörper in das Sediment wird ein neuer Weg aufgezeigt. Eine Fixierung dieser Stoffe an Bestandesabfällen (plant litter) ist möglich. Allochthoner Bestandesabfall (Blätter, Früchte, Zweige von Alnus spec. und Quercus spec.) weist nach Kontakt mit kontaminiertem Wasser (ca. 100 - 300 µgU L-1) Urangehalte von 50 - 2.000 µgU g-1 auf. Im Vergleich zu Uran sind Ra-226 und Arsen labiler am Bestandesabfall gebunden. Für die Genese der Gehalte in den subhydrischen Auflagen sind die Herkunft des (autochthonen bzw. allochthonen) Bestandesabfalls und der Abbau eine entscheidende Rolle. Sedimente aus leicht abbaubaren Bestandesabfällen (z.B. Lemna spec., Algen) weisen im Vergleich mit allochthonen Bestandesabfällen (von Bäumen) deutlich geringere Urangehalte auf. Exemplarisch wurde für einen aus allochthonen Bestandesabfällen bestehenden Sedimentkern mittels Cs-137-Bestimmung eine maximale Uranfestlegung von 1 – 2 g m-² a-1 ermittelt. Neben allochthonem Bestandesabfall führen Eisen- und Manganhydroxide, die unmittelbar an den Sickerwasseraustrittstellen ausfallen, bei relativ geringen Arsen- und Radiumkon¬zentrationen im Wasser zu hohen Arsen- bzw. Radiumgehalten im Sediment (As ≤ 5 mg g-1; Ra-226 ≤ 25 Bq g-1). Unter reduktiven Bedingungen werden Ra-226 und Arsen jedoch leicht freigesetzt. Ausgehend von den Untersuchungsergebnissen wird eine mögliche Anordnung für eine naturnahe passive Sickerwasserbehandlung vorgeschlagen.
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| 332 |
A Population Demographic of Midland Painted Turtles (<i>Chrysemys picta marginata</i>) in Conrad Balliet Family Nature Preserve PondVogt, Leah 03 August 2023 (has links)
No description available.
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| 333 |
GIANT voice : An alternative destiny for city glitchesTang, Yuqing January 2024 (has links)
My degree project aims to find an alternative destiny to the city glitches- the forgotten industrial buildings which are constantly being torn down. All the memories, the urban creatures that nest inside them, are considered disposable in city planning. The aim of this project is not to stop urban development but to create spaces where this endless force magically stops, a bubble of “utopia”, where the urban beings take their own time to flourish, undisturbed. I focus my project on the abandoned factory house Nitrolackfabriken in the southern part of Stockholm, a building threatened with demolition. I went through three stages in the design process: first background research, second a design proposal about turning the building into a functional culture house, and lastly landed on a design intervention where I gave up the previous culture house proposal, refused it on behave of the building itself, and gave the house back to what is already inside. I created three design interventions in this new part of the project: the garden, the pond, and the fire room. I see the building and all the small beings nesting inside as part of an intertwining relationship, a living being, a “GIANT.” I abstracted her into a human-like shape, wishing to create an emotional resonance between the GIANT and us. To remind us that we are all part of this complexity.
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| 334 |
Erfassung und Risikoanalyse von niedersächsischen Aquakulturbetrieben vor dem Hintergrund der Fischseuchengesetzgebung / Census and risk analysis of Lower Saxony aquaculture production business against the background of fish epizootics legislationKleingeld, Dirk Willem 06 July 2010 (has links)
No description available.
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| 335 |
Sportovně - rekreační centrum Vsetín, Ohrada / Sports and Relaxation Centre Vsetín, OhradaKuklínková, Klára January 2019 (has links)
Diploma thesis of was preceded by a specialized studio focused on the development of urban-architectural design in the area of "Vsetín - Ohrada". The newly created objects have the a task of transform the whole territory, which nowadays deteriorate. The solved area is separated by the highest industrial zone from the edge of the city and after the connection to the urban area. The whole sports complex is conceived as an independent urban complex, mainly linked to the surrounding nature. These are cycle paths that are designed for the entire area. The center is designed for the needs of the population of Vsetín and its catchment areas. Sports, recreational options for all ages. The grassy wall divides the river from the city and reflects the calm zone by the river, and at the same time divides large flat areas. In addition to sports, the area offers wellness, gastro and meeting places. The advantage of this place is cycling trail parallel to the beautiful nature. Moreover, the grassy wall is used to hide service roads and parking spaces. This ensures excellent transport accessibility and supply, but does not interfere with the sports complex. Wall created from excavations of single buildings and demolition works of the original stadium will achieve a safe transition from one sports ground to another, creating a natural observation post and incorporating buildings and sports facilities to become part of the wall and form a single unit. By embedding buildings in the wall, the buildings visually diminish. The embedded sports ground is bounded on two sides by a rampart and the third by a staircase. It can be used as a grandstand, or to enter the ridge of the dike. This minimizes the need for unsightly fencing on each pitch. With the new concept we will meet the requirements of visitors in the given locality and, above all, the attractiveness of the whole area will be increased.
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