Skill Shortages,Demographic Aging,and Training Implications for Skill-Based Economies     

Helen Lawton Smith 《The Professional geographer》2013,65(1):59-69

This article draws on a study of the supply of technician training in engineering and science and technology sectors in Oxfordshire in southeast England. The study conducted between January and May 2004 set out to identify the challenges facing training providers and employers in the context of an increasing age profile of technicians, while the skills demanded of technicians are changing. Some forty interviews were conducted with local providers of training, employers, and industry organizations. The study shows that a key part of the Oxfordshire labor market is undergoing radical changes in structure and function. So far these changes have not been matched by a coherent training response.  相似文献   

Forthcoming events     

Dr Helen Mounsey 《International journal of geographical information science》2013,27(5):451-454

Abstract

This is the second of two papers which elaborates a framework for embedding urban models within GIS. In the first paper (Batty and Xie 1994), we outlined how the display functions of a proprietary GIS could be used to organize a series of external software modules which contained the central elements of the modelling process, namely dataset selection and analysis, and model specification, calibration, and prediction. In that paper, we dwelt on display and data analysis functions whereas here we outline the model-based functions of the system. We begin by reviewing residential location models based on population density theory, stating continuous and discrete model forms, and calibration methods. We then illustrate a pass through the software using data for the Buffalo urban region, showing how observed data and model estimates can be evaluated through graphic display. We present ways in which the system can be used to explore and fit a variety of models to different zoning systems and in so doing, show how subset selection and aggregation can be used to find models with good fit. Finally we draw conclusions and outline an agenda for further research.  相似文献   

Classification of kangaroo habitat distribution using three GIS models     

Andrew K. Skidmore  Alison Gauld  Paul Walker 《International journal of geographical information science》2013,27(4):441-454

Abstract

In this paper, we compare three techniques for mapping wildlife habitat, termed BIOCLIM, CART and a new classification method based on nonparametric techniques. These techniques model dependent map layers of species distributions, where the areas to be mapped are large and the plot data is sparse. The techniques recognise pattern in the (independent) plot data, available to natural resource managers. In this case, the independent data set comprised 12 climate surfaces, that attempt to represent the range of temperature and precipitation important in determining the habitat of kangaroos across Australia. With this particular data set, the CART (decision tree) model was most accurate, but more time consuming to initialise. The relative performance of these models depends on the quality of the data set, and skill of the GIS analyst. Where possible, GIS analysts should implement all available methods, and compare output.  相似文献   

Secular and orbital variability of Cir X-1 observed in optical spectra     

Helen M. Johnston  Kinwah Wu  Rob Fender  Jason G. Cullen 《Monthly notices of the Royal Astronomical Society》2001,328(4):1193-1199

We have observed variations in the optical emission lines from the X-ray binary Circinus X-1. These variations may be attributed both to orbital variations and to long term secular changes in line strength. We have detected double-peaked H α emission lines on two occasions, providing the first direct evidence for an accretion disc in the system. The separation of the peaks was different on the two occasions, suggesting that the disc might have a different size. The equivalent width of the emission lines dropped by more than a factor of three between 1999 and 2000; this continues the trend seen in earlier data, so that the H α equivalent width has now declined by a factor of 20 since 1976. The emission lines do not appear to show signature of orbital motion, except for the data taken near phase 0, which show a significant velocity shift.
We have observed an absorption component to the He  i lines on one occasion. We suggest that, unlike the P Cygni profiles seen in X-ray spectra, this absorption does not arise in the accelerating zone of a radiatively driven wind. Instead, the absorption arises in material previously ejected from the system. It was only seen on this one occasion because the strength of the emission line had dropped dramatically.  相似文献   

The Eclipsing Binary bx Andromedae and its Orbital Period Behaviour     

Helen Rovithis-Livaniou  Sotirios Tsantilas  Peter Rovithis  DrahomÍr Chochol  AugustÍn Skopal  Theodor Pribulla 《Astrophysics and Space Science》2005,296(1-4):101-104

The orbital period variations of the eclipsing binary BX And are examined analysing its (O–C) diagram 1) with the standard method, in which the minima times are fitted by the quadratic ephemeris combined with an assumed light-time effect, and 2) with the first continuous method. The results from the use of the two methods are, as was expected, different.  相似文献   

The 2dF Galaxy Redshift Survey: the number and luminosity density of galaxies     

Nicholas Cross  Simon P. Driver  Warrick Couch  Carlton M. Baugh  Joss Bland-Hawthorn  Terry Bridges  Russell Cannon  Shaun Cole  Matthew Colless  Chris Collins  Gavin Dalton  Kathryn Deeley  Roberto De Propris  George Efstathiou  Richard S. Ellis  Carlos S. Frenk  Karl Glazebrook  Carole Jackson  Ofer Lahav  Ian Lewis  Stuart Lumsden  Steve Maddox  Darren Madgwick  Stephen Moody  Peder Norberg  John A. Peacock  Bruce A. Peterson  Ian Price  Mark Seaborne  Will Sutherland  Helen Tadros  Keith Taylor 《Monthly notices of the Royal Astronomical Society》2001,324(4):825-841

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The characteristics and source of laminated mud at Lake Barrine, Northeast Australia     

D. Walker  J. A. K. Owen 《Quaternary Science Reviews》1999,18(14):214

In a small (1 km²) crater lake in the Australian upland tropics (17°15′S, 145°38′E, 721 m a.s.l.), laminated mud has accumulated throughout the past 5 ka. It is limited to a central region below 50–67 m of water where it is protected by a monimolimnion. The contents of the laminae (e.g., total lake products, organic detritus, diatoms, pollen grains, vivianite crystals) distinguish two contrasting types, namely detritus-rich and detritus-poor. Judged against radiocarbon dates over long sequences, these couplets are not annual. Gravimetric, mineralogical and chemical observations on the mud, and on suspended organic and inorganic matter caught through several periods, indicate some diagenetic changes across the mud–water interface. Diatom analyses do not assist in relating mud type to source or period of origin. The most likely mechanism of lamination is that continuous deposition of clay, with small and varied detrital accompaniment, is periodically enhanced by greater detrital input. This occurs in some, but not all, periods of winter isothermy when ground temperatures fall to zero and below on several consecutive nights. This leads to the stirring of sediments in water shallower than 50 m and their relocation in the deeper meromictic zone. Fine variations in, e.g., diatom content, partly independent of lamination type, probably contain a wealth of detail about the lake’s environmental history.  相似文献   

Homo britannicus: the incredible story of human life in Britain. C. Stringer. Publisher: Penguin,London, 2006 (319 pp.) ISBN 0‐713‐99795‐8     

Mike Walker 《第四纪科学杂志》2008,23(3):309-310

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First ground-based 200-μm observing with THUMPER on JCMT – sky characterization and planet maps     

D. Ward-Thompson  P. A. R. Ade  H. Araujo  I. Coulson  J. Cox  G. R. Davis  Rh. Evans  M. J. Griffin  W. K. Gear  P. Hargrave  P. Hargreaves  D. Hayton  B. J. Kiernan  S. J. Leeks  P. Mauskopf  D. Naylor  N. Potter  S. A. Rinehart  R. Sudiwala  C. R. Tucker  R. J. Walker  S. L. Watkin 《Monthly notices of the Royal Astronomical Society》2005,364(3):843-848

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Toxic metal enrichment and boating intensity: sediment records of antifoulant copper in shallow lakes of eastern England     

John F. Boyle  Carl D. Sayer  Dan Hoare  Helen Bennion  Kate Heppel  Stephen J. Lambert  Peter G. Appleby  Neil L. Rose  Anthony J. Davy 《Journal of Paleolimnology》2016,55(3):195-208

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