Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 1367 for “"TH"”.
-
U-Th Dating of lacustrine carbonates
… have been hindered by poor chronology. Uranium-thorium (U-Th) dating has the potential to fill a gap in current geochronological tools for such archives, but past attempts have been confounded by poor understanding of the complex makeup of lacustrine carbonates, leading to misguided conclusions …
-
Variations in the particulate flux of ²³⁰Th and ²³¹Pa and paleoceanograhpic applications of the ²³¹Pa/²³¹Th ratio
Fractionation between 230Th (t1/2 = 7.5x104yr) and 231 Pa (t1/2 = 3.2x104yr), the two longest-lived radionuclides produced from the decay of natural uranium, is found widely within the oceans. This large scale fractionation was investigated in samples of sinking particulate matter collected with …
-
The History of th Tidings 1895-1945
<p>The newspapers may properly be described as the eyes and ears of every man and woman in the land. It is on the papers that they depend, at least partially, for the knowledge of the whole of contemporary life, except that insignificant fraction of it which falls within the narrow limits of their …
-
Ozsva?th-Szabo? invariants of contact surgeries
In this thesis, I am going to deal with contact manifolds of dimension three: these are orientable manifolds with a plane field that is nowhere tangent to a surface. Contact manifolds split into two families, the overtwisted ones and the tight ones, according to the presence or absence of a certain …
-
Applying U-Th Disequilibrium to Dating Siliceous Sinter
Continental hydrothermal systems are critical avenues for the crustal transport of heat and mass captured for geothermal energy and mineral exploration. Thus, understanding their temporal evolution and longevity is important for resource characterization. In particular, high temperature reservoirs …
-
Outdoor augmented reality n-th game editing suite
… Augmented Reality provides players a view of the real world augmented with virtual characters and information. Augmented Reality has proved to be a valuable educational tool, but bridging the gap between experimental game engines and in-class deployment has proved difficult. OARnGES attempts …
-
Zircon (U-Th)/He Dates from Radiation Damaged Crystals: A New Damage-He Diffusivity Model for the Zircon (U-Th)/He Thermochronometer
Zircon (U-Th)/He (zircon He) dating has become a widely used thermochronologic method in the geosciences. Practitioners have traditionally interpreted (U-Th)/He dates from zircons across a broad spectrum of chemical compositions with a single set of ⁴He diffusion kinetics derived from only a …
-
Modulatoren des Calcineurin-NFATc-Signalweges in humanen TH-Zellen
Die Ca2+/Calmodulin-aktivierte Serin/Threonin-Phosphatase Calcineurin ist ein Schlüsselmolekül des T-Zell-Rezeptorabhängigen Signalnetzwerkes. Calcineurin aktiviert die Transkriptionsfaktoren der NFATc-Familie durch Dephosphorylierung und reguliert darüber die Expression wichtiger Zytokine und …
-
On the Development of a Very Fast Simulator for TH-UWB Systems = Sobre el Desarrollo de un Simulador Rápido para los Sistemas TH-UWB
Impulse Radio-Time Hopping-Ultra Wideband (IR-TH-UWB) is a relatively new technology that might have a big effect on improving wireless communication. Multipath resistance, low power, high capacity, coexistence with other systems, ability of penetrating walls are some of the characteristics that …
-
U-Th-Pb fractionation in selected carbonate and silicate systems
V-Th-Pb fractionation trends, and the associated variations in Pb-isotopes, provide important constraints on the nature, and age, of a wide range of geological processes. This thesis presents three detailed case studies from a carbonatite intrusive complex, lower crustal granulite xenoliths, and …
-
The development and application of microanalytical (U-Th)/He thermochronology
The (U-Th)/He thermochronmeter is the foremost tool available to geoscientists for the purposes of constraining the thermal evolution of the crust below 250°C. However, the potential of the technique is far from fully explored. The existing de facto (U-Th)/He age standard, the fluorapatite of Cerro …
-
The 5-th element. A new high pressure high temperature allotrope
Boron is the fifth element in the Periodic Table known for its structural complexity, unusual types of bonding, and for a rich variety of compounds that it forms. Even the number of its existing or hitherto proven elemental modifications is still under discussion. The present study of boron …
-
The Fraser Lakes Zone B U-Th-REE deposit and its host rocks : implications for pegmatite- and leucogranite-hosted U-Th-REE deposits in northern Saskatchewan, Canada
The Fraser Lakes Zone B U-Th-LREE deposit is located approximately 50 km SE of the Key Lake uranium mine in the Wollaston Domain of Northern Saskatchewan, Canada. Here, a number of variably radioactive pegmatites and leucogranites intruded the highly sheared, unconformable contact between …
-
The Elgamal Cryptosystem is better than Th RSA Cryptosystem for Mental Poker
Cryptosystems are one of the most important parts of secure online poker card games. However, there is no research comparing the RSA Cryptosystem (RC) and Elgamal Cryptosystem (EC) for mental poker card games. This paper compares the RSA Cryptosystem and Elgamal Cryptosystem implementations of …
-
Development of Radiochemical Quality Control Methods for Ra-223 and Th-227 Radiotherapies
… treatment are a mainstay of patient management. The majority of radiopharmaceuticals deployed to date undergo a single radioactive transition (decay) to reach a stable ground state. Complex emitters, which produce a series of daughter radionuclides, are emerging as novel radiopharmaceuticals, and …
-
Leakage-corrected discontinuity factors for a second-generation Th-Pu pressure-tube SCWR.
The neutron flux throughout a reactor core should be calculated, ideally, by solving the neutron transport equation for a highly detailed geometric model of the core. Since this is computationally impractical, approximate node-homogenized models have historically been used whereby neutronic …
-
Massenspektrometrische Th/U-Datierung von Höhlensintern aus dem Oman: Klimaarchive des asiatischen Monsuns
… Ziel dieser Untersuchung ist es, hochaufgelöste Thorium/Uran-Zeitskalen an den Höhlensintern zu erstellen, um die Periodizitäten des d18O exakt zu datieren. Durch die Fortschritte der Thermionen-Massenspektrometrie (TIMS) und das hohe Datierungspotential der Proben konnte eine hochgradige …
-
Isotopengeochemie des Heidelberger Neckarschwemmfächers - Th/U-Ungleichgewichte und Pb-Isotopie quartärer klastischer Sedimente
… die langlebigen Radionuklide 238U, 234U, 230Th und 232Th und Blei-Isotopenverhältnisse mithilfe der Thermionen-Massenspektrometrie (TIMS) untersucht. Anomal positive d234U-Werte können mit einer post-depositionalen Urananreicherung aus dem Grundwasser durch authigene Bildung von …
Page 1 of 69