1,924 research outputs found
The geological record of Neoproterozoic ice ages
No full textEmmanuelle Arnaud, Galen P. Halverson and Graham Shields-Zho
Chemostratigraphy and the Neoproterozoic glaciations
No full textAlso published as a book chapter: The Geological Record of Neoproterozoic Glaciations, 2011 / E. Arnaud, G. P. Halverson and G. Shields-Zhou (eds.), Ch.4 pp. 51-66Although the pre-glacial Proterozoic isotopic record is poorly constrained, it is apparent that the chemical and isotopic composition of the oceans began to change during the early to mid-Neoproterozoic and experienced considerable fluctuations alongside climatic instability during much of the subsequent Cryogenian and Ediacaran periods. The earliest known large negative δ13C excursion appears to post-date 811 Ma and fluctuations became progressively more extreme, culminating in the late-Ediacaran ‘Shuram–Wonoka’ anomaly. The negative excursions are commonly associated with pre-glacial and post-glacial times, while extremely high δ13C values are characteristic of strata between glaciations. The precise causal mechanism for these excursions is subject to debate. Seawater 87Sr/86Sr rose during the Neoproterozoic, with abrupt increases following deglaciation consistent with enhanced weathering rates. Reported marine sulphate and pyrite δ34S data exhibit marked variation through this interval, although the changes are not always consistent within or between sedimentary successions of equivalent age. Iron-speciation studies indicate that much of this variation was caused by fluctuating and low sulphate concentrations in seawater, which at times led to the build-up of ferruginous conditions in the ocean. The application of chemostratigraphy to understanding and correlating the Neoproterozoic glaciations evokes considerable controversy, and many questions persist regarding the reliability and calibration of the δ13C, 87Sr/86Sr and δ34S record. Nevertheless, the individual glaciations appear to be characterized by distinct combined chemostratigraphic signatures, in large part due to the generally increasing strontium isotope composition of seawater through the Neoproterozoic Era.Galen P. Halverson, and Graham Shields-Zho
Brooke Shields Addresses FIT Graduates
No full text2015 Commencement Speaker: Brooke Shields, Actor, Author, and Entrepreneur
Bob and Burton Shields, Lorraine and Graham Phillips, Doc and Yvonne Murphrey and Barbara and Jeff Batts
No full textBob and Burton Shields, Lorraine and Graham Phillips, Doc and Yvonne Murphrey and Barbara and Jeff Batts at Hawaii Kai in New York
Sulphur isotopic evolution of Neoproterozoic-Cambrian seawater: new francolite-bound sulphate delta(34)S data and a critical appraisal of the existing record
No full textGraham Shields, Hiroto Kimura, Jiedong Yang, Paul Gammo
Financial literature about discounted cash flow valuation
No full textThere is a wealth of literature about discounted cash flow valuation. In this paper, we will discuss the most important papers, highlighting those that propose different expressions for the value of the tax shield (VTS). The discrepancies between the various theories on the valuation of a company's equity using discounted cash flows originate in the calculation of the value of the tax shield (VTS). This paper illustrates and analyzes 7 different theories and presents a new interpretation of the theories.discounted cash flow valuation; cash flow valuation; value of tax shields; present value of the net increases of debt; required return to equity;
A more realistic valuation: APV and WACC with constant book leverage ratio
No full textWe value a company that targets its capital structure in book-value terms. This capital structure definition provides us with a valuation that lies between those of Modigliani-Miller (fixed debt) and Miles-Ezzell (fixed market-value leverage ratio). We show that if a company targets its leverage in market-value terms, it has less value than if it targets the leverage in book-value terms. We also present empirical evidence that permits us to conclude that debt is more related to the book-value of the assets than to their market-value.value of tax shields; required return to equity; company valuation; cost of equity;
Shields, Lawrence Graham (1941–1973) and Marion (Gibbons) Shields
No full textLawrence Shields and his wife, Marion worked as a pastoral couple in Australia and were missionaries to Papua New Guinea. Lawrence was a pilot in the Seventh-day Adventist Church aviation program and was killed in a tragic plane crash in April 1973.https://research.avondale.edu.au/esda/1415/thumbnail.jp
Application of similarity principles and turbulence research to bed-load movement
No full textTranslation of the Ph.D. thesis of A. Shields "Anwendung der Aehnlichkeitsmechanik und der Turbulenzforschung auf die Geschiebebewegung"
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