Learning and earning: relational scales of children's work     

Joel Jennings  Stuart Aitken  Silvia López Estrada  Adriana Fernandez 《Area》2006,38(3):231-239

There is an important dissonance in recent studies of children's work between the global efforts to eradicate abusive forms of child labour on the one hand and, on the other hand, local settings where children's work plays an important role in social reproduction, socialization and skill acquisition. This research explores the reasons for this dissonance by eliding both the global perspectives of children's rights and the local realities of children's daily geographies. By closing the gap between global knowledge about children (from above) and children's knowledge and agency in their own environments (from below), we seek to present a relational account of children's work within the context of their daily geographies. We draw on data collected with child workers in Tijuana, Mexico to demonstrate the complex role that children's work often plays in the daily geographies of young people.  相似文献   

Mid-infrared imaging and spectroscopy of the southern HII region RCW 38     

Craig H. Smith  Tyler L. Bourke  Christopher M. Wright  Henrik W. W. Spoon Spoon  David K. Aitken  Garry Robinson  John W. V. Storey  Takuya Fujiyoshi  Patrick F. Roche  Thomas Lehmann 《Monthly notices of the Royal Astronomical Society》1999,303(2):367-379

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Magnetic Environments of Young Stellar Objects     

Antonio Chrysostomou  Rachel Curran  David Aitken  Tim Jenness  Chris Davis 《Astrophysics and Space Science》2003,287(1-4):161-164

We report on early results of magnetic field measurements towards a sample of young stellar objects. The results show a variety of field configurations, some of which can be explained by conventional models, while others cannot. We find that the field in some cases is curved over large scales and influenced by the gas kinematics in the local environment. This implies that, at these scales at least, the magnetic field plays a passive rôle in the star formation process.  相似文献   

The Magnetic Environments of Young Stellar Objects     

Antonio Chrysostomou  Rachel Curran  David Aitken 《Astrophysics and Space Science》2004,292(1-4):509-515

We report on early results of submillimetre polarimetric measurements towards a sample of young stellar objects. The results allow us to infer the magnetic field structure and show a variety of configurations, providing evidence for axial, helical and pinched (i.e. ‘hourglass’) magnetic field configurations. We find that in some cases the field is curved over large scales, implying that it is influenced by the gas kinematics in the local environment, and that at these scales at least, the magnetic field plays a passive rôle in the star formation process.  相似文献   

Environmental Design Research Association (EDRA)     

Stuart C. Aitken 《The Professional geographer》1989,41(4):490-492

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Detection of Polarized Millimeter and Submillimeter Emission from Sagittarius A*     

Aitken DK  Greaves J  Chrysostomou A  Jenness T  Holland W  Hough JH  Pierce-Price D  Richer J 《The Astrophysical journal》2000,534(2):L173-L176

We report the detection of linear polarization from Sgr A* at 750, 850, 1350, and 2000 μm which confirms the contribution of synchrotron radiation. From the lack of polarization at longer wavelengths, it appears to arise in the millimeter/submillimeter excess. There are large position angle changes between the millimeter and submillimeter results, and these are discussed in terms of a polarized dust contribution in the submillimeter and various synchrotron models. In the model that best explains the data, the synchrotron radiation from the excess is self-absorbed in the millimeter region and becomes optically thin in the submillimeter. This implies that the excess arises in an extremely compact source of approximately 2 Schwarzschild radii.  相似文献   

Children's Geographies: Tracing The Evolution and Involution of a Concept   总被引：1，自引：0，他引：1       下载免费PDF全文

Stuart C. Aitken 《Geographical review》2018,108(1):3-23

This essay traces the evolution of children's geographies as a concept through three phases. First, in the early 1970s as a beginning impression influenced heavily by developmental and environmental psychology. Second, beginning around 1990, children's geographies cohered politically as geographers focused on young people's identity through feminism and Marxism, and global policy initiatives on children's rights. The third phase, covering the last couple of decades, coming from issues of political identity, challenges what we think we know about young people and their geographies, and also advocates a set of loose theories about the ways young people create and re‐create spaces and themselves. Cognate disciplines coming to geography for insights about children and their worlds characterize this current phase. To offset this seeming linear progression the essay also notes an involution of the concept that defies clear categories and sequences, but suggests the fluidity of tensions and accommodations that comprises children's geographies.  相似文献   

Coal and coal-bearing strata as oil-prone source rocks special publication No. 77 Geological Society,London, edited by A. C. Scott and A. J. Fleet, 1994. No. of pages: 208. Price: £45 ($75); Members £22 ($37). ISBN 1903317 99 0     

John F. Aitken 《Geological Journal》1995,30(2):203-203

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Evolution of the Grenada and Tobago basins and implications for arc migration     

Trevor Aitken  Paul Mann 《Marine and Petroleum Geology》2011,28(1):235-258

The tectonic mechanisms controlling how volcanic arcs migrate through space and geologic time within dynamic subduction environments is a fundamental tectonic process that remains poorly understood. This paper presents an integrated stratigraphic and tectonic evolution of Late Cretaceous to Recent volcanic arcs and associated basins in the southeastern Caribbean Sea using seismic reflection data, wide-angle seismic refraction data, well data, and onland geologic data. We propose a new tectonic model for the opening of the Grenada and Tobago basins and the 50-250-km eastward jump of arc volcanism from the Late Cretaceous Aves Ridge to the Miocene to Recent Lesser Antilles arc in the southeast Caribbean based on the mapping of three seismic megasequences. The striking similarity of the half-graben structure of the Grenada and Tobago basins that flank the Lesser Antilles arc, their similar smooth basement character, their similar deep-marine seismic facies, and their similar Paleogene sediment thickness mapped on a regional grid of seismic data suggest that the two basins formed as a single, saucer-shaped, oceanic crust Paleogene forearc basin adjacent to the now dormant Aves Ridge. This single forearc basin continued to extend and widen through flexural subsidence during the early to middle Eocene probably because of slow rollback of the subducting Atlantic oceanic slab. Rollback may have been accelerated by oblique collision of the southern Aves Ridge and southern Lesser Antilles arc with the South American continent. Uplift and growth of the southern Lesser Antilles arc divided the Grenada and Tobago basins by early to middle Miocene time. Inversion of normal faults and uplift effects along both edges of the Lesser Antilles arc are most pronounced in its southern zone of arc collision with the South American continent. The late Miocene to Recent depositional histories of the Grenada and Tobago basins are distinct because of isolation of the Grenada basin by growth and uplift of the Neogene Lesser Antilles volcanic ridge.  相似文献   

A geophysically constrained multi-scale litho-structural analysis of the Trans-Tanami Fault,Granites-Tanami Orogen,Western Australia     

D. B. Stevenson  L. Bagas  A. R. A. Aitken  T. C. McCuaig 《Australian Journal of Earth Sciences》2013,60(8):745-768

The Trans-Tanami Fault in the poorly exposed Paleoproterozoic Granites-Tanami Orogen of Western Australia is an ～100 km long curvilinear structure with ～6 km right lateral displacement. Multi-scale integration and analysis of aeromagnetic, gravimetric, reflection seismic and remote sensing data have constrained the relative timing and architectural relationship of this structure. Interpretation of regional scale long-wavelength potential field (gravity and magnetic) anomalies, which are commonly used to define first-order structures, show that the fault is not a terrane boundary. Structural interpretation of short-wavelength potential field data illustrates that the structural domains on either side of the fault represent the products of a non-homogeneous stress regime developed between rigid granitic plutons. Additionally, 2D joint forward modelling of gravity and magnetic data and interpretation of reflection seismic data confirms the vertical displacement across this fault to be negligible indicating a predominant lateral displacement. The lateral displacement along a portion of this structure has exploited a pre-existing plane of a north-dipping thrust fault. Where this early thrust fault terminates, the Trans-Tanami Fault displaces previously unfaulted rock as a wrench fault step-over. These observations differ from previous findings in the area by constraining the absolute displacement of this structure and through the recognition of a wrench fault system that includes lateral step-overs between re-activated early thrust fault planes.  相似文献