Ross Gelbspan,The Heat is On: The High Stakes Battle Over Earth's Threatened Climate     

Steel  Duncan 《Earth, Moon, and Planets》1997,76(1-2):124-124

Earth, Moon, and Planets -  相似文献   

Contents to Volume 9     

Thomas Duncan  Timothy J. Shaw 《Aquatic Geochemistry》2003,9(4):361-362

Volume Contents

Contents to Volume 9  相似文献   

Lead isotope systematics and the evolution of the core,mantle, crust and atmosphere     

Ian J. Duncan 《Journal of Geodynamics》1985,2(1):1-21

A new analysis of the isotope systematics of sulphide common leads can be made on the basis of examining the deriations of the data from a simple single-stage evolution. Δt, the age discrepancy between the single-stage lead model age and the geologic age, increases systematically from 3.8 Ga to the present. This trend appears to reflect an increase in the μ of the primitive mantle due to incorporation of a large portion of the earth's lead into the core, early in the earth's evolution. Leads associated with shale-hosted lead-zinc deposits show a rapid increase in Δt beginning at 2.5 to 2.0 Ga. This deviation of shale-hosted leads from the general trend is interpreted as a response to concentration of uranium in organic-rich shales subsequent to the evolution of an oxidizing atmosphere. Comparison of common leads in alkali feldspars with the volcanogenic sulphide data suggests that they have a similar evolution of Δt with time. Numerical simulations reveal that even substantial increases in real μ over the last 2.0 Ga are not reflected in significant increases in the single-stage model μs.  相似文献   

Consolidation analysis for partly saturated clay by using an elastic–plastic effective stress–strain model     

C. S. Chang  J. M. Duncan 《国际地质力学数值与分析法杂志》1983,7(1):39-55

The theory of consolidation is extended to partly saturated clay soils, and formulated for finite element analyses. This formulation couples the effects of both stress and flow. It takes account of variations of this permeability of the soil and compressibility of the pore fluid with changes in void ratio, and the non-linear stress–strain behaviour of soil. The Cam Clay model is revised to model the stress–strain behaviour of compacted soils. The compressibility of pore fluid is derived using Boyle's Law and Henry's Law, taking into account the effect of surface tension. An empirical equation is developed for permeability of pore fluid. An example of settlement of a footing on partly saturated soil is described and discussed.  相似文献   

The fundamental plane of isolated early-type galaxies   总被引：1，自引：0，他引：1  

Fatma M. Reda  Duncan A. Forbes  George K. T. Hau 《Monthly notices of the Royal Astronomical Society》2005,360(2):693-702

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XTE J1550–564: a superluminal ejection during the September 1998 outburst     

Diana Hannikainen  Duncan Campbell-Wilson  Richard Hunstead  Vince McIntyre  Jim Lovell  John Reynolds  Tasso Tzioumis  Kinwah Wu 《Astrophysics and Space Science》2001,276(1):45-48

In 1998 September, the X-ray transient XTE J1550–564 underwent amajor outburst in soft and hard X-rays, followed by a radio flare. Australian Long Baseline Array imagesobtained shortly after the peak in the radio flare showed evolving structure.The components observed have an apparent separation velocity of >2c.  相似文献   

The failure of Teton Dam     

H. Bolton Seed  James Michael Duncan   《Engineering Geology》1987,24(1-4):173-205

This paper reviews the events leading to the failure of Teton Dam in Idaho on June 5, 1976 and the investigations, conducted over a period of about eight years, to determine the cause of the failure. Conclusions are presented regarding the probable trigger mechanisms which initiated the failure, the mechanics of failure and the significant lessons concerning earth dam design and construction resulting from the investigations.  相似文献   

A spatial and temporal drought risk assessment of three major tree species in Britain using probabilistic climate change projections     

Michal Petr  Luc G. J. Boerboom  Anne van der Veen  Duncan Ray 《Climatic change》2014,124(4):791-803

Probabilistic climate data have become available for the first time through the UK Climate Projections 2009, so that the risk of change in tree growth can be quantified. We assessed the drought risk spatially and temporally using drought probabilities calculated from the weather generator data and tree species vulnerabilities using Ecological Site Classification model across Britain. We evaluated the drought impact on the potential yield class of three major tree species (Picea sitchensis, Pinus sylvestris, and Quercus robur), which cover around 59 % (400,700 ha) of state-managed forests, across the lowlands and uplands. We show that drought impacts result mostly in reduced tree growth over the next 80 years when using B1, A1B, and A1FI IPCC emissions scenarios, but varied spatially. We found a maximum reduction of 94 % but also a maximum increase of 56 % in potential stand yield class in the 2080s from the baseline climate (1961–1990). Furthermore, potential production over the state-managed forests for all three species in the 2080s is estimated to decrease due to drought by 42 % in the lowlands and by 32 % in the uplands in comparison to the baseline climate. Our results reveal that potential tree growth and forest production on the state-managed forests in Britain is likely to reduce, and indicate where and when adaptation measures are required. Moreover, this paper demonstrates the value of probabilistic climate projections for an important economic and environmental sector.  相似文献   

Encircling the Peak of World Oil Production     

Duncan  Richard C.  Youngquist  Walter 《Natural Resources Research》1999,8(3):219-232

Natural Resources Research - The peak of world oil production, followed by an irreversible decline, will be a watershed in human history. The goal of this paper is to predict the world peak....  相似文献   

Applied sedimentology by R. C. Selley,Academic Press,San Diego, 2000. No. of pages: 523 (hardback). ISBN 012 636375 7     

Duncan Pirrie 《Geological Journal》2004,39(2):230-230

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