Trace elements in soils: H. Aubert and M. Pinta. Developments in soil science, 7. Elsevier Publishing Co., 1977, 395 p. $49.50     

Albert L. Page 《Geochimica et cosmochimica acta》1978,42(9):1466

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Atmosphere,Weather, and Baseball: How Much Farther Do Baseballs Really Fly at Denver's Coors Field?     

Frederick Chambers  Brian Page  Clyde Zaidins 《The Professional geographer》2003,55(4):491-504

This article tests the widely held assumption that batted baseballs travel 10 percent farther in Denver than in major‐league ballparks at sea level. An analysis of (1) National League fly‐ball‐distance data for 1995–1998, (2) the micrometeorology of Coors Field, and (3) weather dynamics along the Colorado front range shows that the assumed elevation enhancement of fly‐ball distance has been greatly overestimated due to prevailing weather conditions in downtown Denver. We conclude that the record number of home runs at Coors Field must be attributed as much to the personnel of the Colorado Rockies team and the effects of mile‐high elevation on the act of pitching a baseball as to the effect of low air density on fly‐ball distance.  相似文献   

Total Sulfur Concentration in Geological Reference Materials by Elemental Infrared Analyser   总被引：1，自引：0，他引：1  

L. Paul Bédard  Dany Savard  Sarah-Jane Barnes 《Geostandards and Geoanalytical Research》2008,32(2):203-208

Total sulfur is an analyte for which there are few determinations published, despite the fact that it is a very important element (e.g., a major element in most ores, an important gas constituent in global warming, an active participant in acid drainage). Most geological reference materials have very poor quality sulfur results, that is with relative standard deviations (RSD) in the range of 30–50%, even for concentrations over 100 μg g⁻¹ S, which compromises their use as calibrators. In order to provide modern results with low RSD, sulfur was determined in twenty-nine geological reference materials with a state-of-the-art elemental S/C analyser using metal chips (certified reference materials with a traceability link) and analytical grade sulfur for high concentration samples. Analytical parameters (sample mass, crucible degassing, calibration strategy, etc.) were optimised by testing. Our results agreed with reference material values provided by issuing bodies. Results for CCRMP SY-2 (129 ± 13 μg g⁻¹ S), which has been proposed as a sulfur reference material, were in agreement with the proposed modern value of 122 ± 3.7 μg g⁻¹ S.  相似文献   

Africa’s middle class: building houses and constructing identities in the small town of Buea,Cameroon     

Ben Page  Emile Sunjo 《Urban geography》2018,39(1):75-103

Across Africa households are commissioning new domestic buildings for their own use or to rent out rather than waiting for governments to supply urban shelter. We conceptualize this as two interwoven processes: building houses for a new middle class and the building of a new middle class identity. We draw particular attention to the impact of international migration on these processes. The paper uses quantitative data from building permits and qualitative data from 29 interviews and walk-round tours with homeowners and government officials in Buea, Cameroon. Despite some significant caveats (related to housing the urban poor, regulating building standards, and lost local government revenue), we argue that these individually initiated building projects do a reasonable job of meeting local demand for shelter. However, from the perspective of identity-building these buildings are less successful. Whilst homeowners take considerable pride in their building projects, the statements that these structures make about their identities are not always “read” by their neighbours in the way owners hope. New housing is the lens through which Buea’s residents interpret growing levels of inequality and its associated social tensions.  相似文献   

Cooling of Accretion-Heated Neutron Stars     

Rudy Wijnands  Nathalie Degenaar  Dany Page 《Journal of Astrophysics and Astronomy》2017,38(3):49

We present a brief, observational review about the study of the cooling behaviour of accretion-heated neutron stars and the inferences about the neutron-star crust and core that have been obtained from these studies. Accretion of matter during outbursts can heat the crust out of thermal equilibrium with the core and after the accretion episodes are over, the crust will cool down until crust-core equilibrium is restored. We discuss the observed properties of the crust cooling sources and what has been learned about the physics of neutron-star crusts. We also briefly discuss those systems that have been observed long after their outbursts were over, i.e, during times when the crust and core are expected to be in thermal equilibrium. The surface temperature is then a direct probe for the core temperature. By comparing the expected temperatures based on estimates of the accretion history of the targets with the observed ones, the physics of neutron-star cores can be investigated. Finally, we discuss similar studies performed for strongly magnetized neutron stars in which the magnetic field might play an important role in the heating and cooling of the neutron stars.  相似文献   

Assessing the significance of wet-canopy evaporation from forests during extreme rainfall events for flood mitigation in mountainous regions of the United Kingdom     

Trevor Page  Nick A. Chappell  Keith J. Beven  Barry Hankin  Ann Kretzschmar 《水文研究》2020,34(24):4740-4754

There is increased interest in the potential of tree planting to help mitigate flooding using nature-based solutions or natural flood management. However, many publications based upon catchment studies conclude that, as flood magnitude increases, benefit from forest cover declines and is insignificant for extreme flood events. These conclusions conflict with estimates of evaporation loss from forest plot observations of gross rainfall, through fall and stem flow. This study explores data from existing studies to assess the magnitudes of evaporation and attempts to identify the meteorological conditions under which they would be supported. This is achieved using rainfall event data collated from publications and data archives from studies undertaken in temperate environments around the world. The meteorological conditions required to drive the observed evaporation losses are explored theoretically using the Penman–Monteith equation. The results of this theoretical analysis are compared with the prevailing meteorological conditions during large and extreme rainfall events in mountainous regions of the United Kingdom to assess the likely significance of wet canopy evaporation loss. The collated dataset showed that event Ewc losses between approximately 2 and 38% of gross rainfall (1.5 to 39.4 mm day⁻¹) have been observed during large rainfall events (up to 118 mm day⁻¹) and that there are few data for extreme events (>150 mm day⁻¹). Event data greater than 150 mm (reported separately) included similarly high percentage evaporation losses. Theoretical estimates of wet-canopy evaporation indicated that, to reproduce the losses towards the high end of these observations, relative humidity and the aerodynamic resistance for vapour transport needed to be lower than approximately 97.5% and 0.5 to 2 s m⁻¹ respectively. Surface meteorological data during large and extreme rainfall events in the United Kingdom suggest that conditions favourable for high wet-canopy evaporation are not uncommon and indicate that significant evaporation losses during large and extreme events are possible but not for all events and not at all locations. Thus the disparity with the results from catchment studies remains.  相似文献   

Determination of Te,As, Bi,Sb and Se (TABS) in Geological Reference Materials and GeoPT Proficiency Test Materials by Hydride Generation‐Atomic Fluorescence Spectrometry (HG‐AFS)     

Eduardo Teixeira Mansur  Sarah‐Jane Barnes  Dany Savard  Peter C. Webb 《Geostandards and Geoanalytical Research》2020,44(1):147-167

The study of Te, As, Bi, Sb and Se (TABS) has increased over the past years due to their use in the development of low‐carbon energy technologies. However, there is a scarcity of mass fraction values of TABS in geological reference materials. This underlines the difficulty in undertaking routine determinations of these elements. The mass fractions of TABS were determined in geological reference materials using hydride generation‐atomic fluorescence spectrometry (HG‐AFS), calibrated with standard solutions. Comparisons with literature values were used to validate the method. Samples from the GeoPT proficiency test were also analysed. For most elements, there are no assigned or even provisional values for many of the GeoPT and reference materials because of the wide range of results reported. For mass fractions above the quantification limit of the method, our results are in good agreement with the median of GeoPT results. Thus, we propose GeoPT median values as informational values for these elements. In contrast, at mass fractions < 0.5 µg g^?1 median values of Se from GeoPT are systematically higher than our results. Our Se results are in agreement with the reference materials down to 0.02 µg g^?1, which suggest that many of the results for Se reported in GeoPT testing are too high.  相似文献   

Investigating the far-IR/radio correlation of star-forming Galaxies to z= 3     

N. Seymour  M. Huynh  T. Dwelly  M. Symeonidis  A. Hopkins  I. M. McHardy  M. J. Page  G. Rieke 《Monthly notices of the Royal Astronomical Society》2009,398(3):1573-1581

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Channel change following European settlement: Gilmore Creek,southeastern Australia     

Ken Page  Paul Frazier  Timothy Pietsch  Remy Dehaan 《地球表面变化过程与地形》2007,32(9):1398-1411

European settlement in southeastern Australia led to rapid changes in the morphology of many upland streams. However, our knowledge of the nature of these changes is limited as historical records and preserved palaeochannels are rare. In this study we compare a well‐preserved section of the late Holocene palaeochannel of Gilmore Creek to its present channel. We used a combination of map and aerial photograph interpretation, field survey, OSL dating and discharge analysis to describe and compare the modern and palaeochannels and establish a firm date for the timing of channel change. In common with many other streams in southeastern Australia Gilmore Creek's late Holocene channel meandered across a stable well‐vegetated and frequently inundated floodplain. After about 1830 European settlers quickly modified the catchment by clearing riparian and hillslope vegetation, introducing grazing animals and other exotic species and mining for alluvial gold in the headwaters. The OSL dates show that between about 1850 and 1880 the small meandering channel aggraded with coarse sands and then up to about 1 m of silty sand was deposited over the floodplain. Declining sediment input from upstream channel avulsion before 1890 resulted in the establishment of a straighter, larger capacity channel that incised to the level of basal cobbles and, in places, to bedrock. The dramatic change in channel pattern resembles that described on the Cann River in eastern Victoria following the removal of riparian vegetation and within‐channel coarse woody debris. At Gilmore Creek increased channel capacity has greatly reduced the average frequency of floodplain inundation. High values of specific stream power suggest that channel morphology is now well adjusted to the present flow regime. Copyright © 2007 John Wiley & Sons, Ltd.  相似文献   

Deep radio imaging of the SCUBA 8-mJy survey fields: submillimetre source identifications and redshift distribution     

R. J. Ivison  T. R. Greve  Ian Smail  J. S. Dunlop  N. D. Roche  S. E. Scott  M. J. Page  J. A. Stevens  O. Almaini  A. W. Blain  C. J. Willott  M. J. Fox  D. G. Gilbank  S. Serjeant  D. H. Hughes 《Monthly notices of the Royal Astronomical Society》2002,337(1):1-25

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