A multiproxy (micro‐XRF,pollen, chironomid and stable isotope) lake sediment record for the Lateglacial to Holocene transition from Thomastown Bog,Ireland          下载免费PDF全文

JONATHAN N. TURNER  NAOMI HOLMES  STEPHEN R. DAVIS  MELANIE J. LENG  CATHERINE LANGDON  ROBERT G. SCAIFE 《第四纪科学杂志》2015,30(6):514-528

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Estimating tectonic uplift of the Cape Fear Arch (south‐eastern United States) using reconstructions of Holocene relative sea level          下载免费PDF全文

ALEX J. WRIGHT  BENJAMIN P. HORTON  SIMON E. ENGELHART  ANDREW C. KEMP  DAVID MALLINSON  ROBERT E. KOPP 《第四纪科学杂志》2014,29(8):749-759

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The fractionation of sea salt and acids during transport across an Antarctic ice shelf     

ROBERT MULVANEY  GUY F. J. COULSON  HUGH F. J. CORR 《Tellus. Series B, Chemical and physical meteorology》1993,45(2):179-187

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Integrating GIS and spatial data analysis: problems and possibilities     

MICHAEL GOODCHILD  ROBERT HAINING  STEPHEN WISE  others? 《International journal of geographical information science》2013,27(5):407-423

Abstract

This article is an agreed summary of a workshop held in Sheffield between 18-20 March 1991. The focus here is on three of the themes of the workshop: the mutual benefits of closer links between geographical information systems (GIS) and the methods of spatial data analysis (SDA); the specific areas of SDA that should be linked with GIS; how the linkage should be made in practice. Directions for future research are also reviewed. The emphasis throughout is on statistical SDA and principally from the perspective of human rather than physical geography.  相似文献   

Diary of forthconing events     

GEORGE H. LEAVESLEY  GREGG C. LUSBY  ROBERT W. LICHTY 《水文科学杂志》2013,58(3):339-344

Abstract

New global models provide the opportunity to generate quantitative information about the world water situation. Here the WaterGAP 2 model is used to compute globally comprehensive estimates about water availability, water withdrawals, and other indicators on the river-basin scale. In applying the model to the current global water situation, it was found that about 24% of world river basin area has a withdrawal to availability ratio greater than 0.4, which some experts consider to be a rough indication of “severe water stress”; the impacts of this stress are expected to be stronger in developing countries than in industrialized ones. Under a “business-as-usual” scenario of continuing demographic, economic and technological trends up to 2025, water withdrawals are expected to stabilize or decrease in 41% of world river basin areas because of the saturation of water needs and improvement in water-use efficiency. Withdrawals grow elsewhere because population and economic growth will lead to rising demand for water, and this outweighs the assumed improvements in water-use efficiency. An uncertainty analysis showed that the uncertainty of these estimates is likely to have a strong geographic variability.  相似文献   

UK retail concentration, Chilean wine producers and value chains     

ROBERT N GWYNNE 《The Geographical journal》2008,174(2):97-108

This paper seeks to examine how value chains impinge upon firms within the Chilean wine sector. The value chain analysis will further link the production and export of wine in Chile with the import and retailing of this wine in one key core economy market, namely that of the UK. The analysis is divided into three sections. First, the political economy of value chains in agro-industry is discussed, particularly in relation to the distinction between network or quasi-hierarchical relationships. Then the paper examines the theme of retail concentration in the UK and the impacts that this has on global value chains which incorporate Chilean wine firms. The focus then moves to value chains and the nature of upgrading within Chilean wine firms by examining the strategic example of the lead firm and firm upgrading as a response to demands of UK retailers and through the flying winemaker model. Broad conclusions on the comparative nature of value chains and the scramble for value within them are finally made.  相似文献   

The geology and age of Peter I 0y, Antarctica     

TORE PRESTVIK  ROBERT A. DUNCAN 《Polar research》1991,9(1):89-98

The island Peter I 0y is located in the BeUinghausen Sea 400 km off the coast of West Antarctica. It is situated at the transition between oceanic and contintental crust close to a former transform fault, the Tharp fracture zone. The island is completely volcanic, consisting of predominantly alkali basalt and hawaiite and some more evolved rocks. Sampling done by the Aurora expedition in 1987 has made dating and detailed petrological studies possible. The island appears to be much younger (<0.5 Ma) than previously believed. However, the volcanic activity responsible for this oceanic island may have lasted for 10-20 Ma. Volcanic activity at the island thus took place at the same time as post-subduction rift-related volcanism took place along the Antarctic Peninsula and in Marie Byrd Land. However, the petrologic data indicate that this may be coincidental and that the Peter I 0y activity is independent and related to transtensional rifting along the Tharp fracture zone.  相似文献   

A STATISTICAL PROCEDURE TO EVALUATE CLEAN-UP STANDARDS     

ROBERT O''BRIEN BIMAL K.SINHA WILLIAM P.SMITH Statistical Policy Branch  Environmental Protection Agency  M St.  SW  Washington  DC  U.S.A. 《地理学报(英文版)》1991,(3)

The object of this paper is to develop a suitable statistical procedure to evaluate clean-up standards athazardous waste sites.Under the assumptions that contaminant masses at a site follow a gammadistribution and that the data from the pre-remediation baseline sample as well as from the interim orfinal sample taken after a certain period of operation are both distributed as gamma with the same shapeparameter but different scale parameters,we derive a uniformly most powerful unbiased test of thehypothesis that a specified percentage of contaminant mass has been reduced.A large-sampleapproximation of the exact test procedure and a comparison with the likelihood ratio test are provided.  相似文献   

Counterpoint     

P.A. ALLEN  ROBERT CAMPBELL 《Geology Today》1985,1(3):74-74

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Origins of Large Volume Rhyolitic Volcanism in the Antarctic Peninsula and Patagonia by Crustal Melting   总被引：10，自引：1，他引：10  

RILEY  TEAL R.; LEAT  PHILIP T.; PANKHURST  ROBERT J.; HARRIS  CHRIS 《Journal of Petrology》2001,42(6):1043-1065

Voluminous rhyolitic volcanism along the palaeo-Pacific marginof Gondwana was marked by three principal episodes of magmatism.The first of these ( V₁) is essentially coincident with themain episode of Karoo–Ferrar magmatism at  相似文献