Representations of utopian urbanism and the feminist geopolitics of “new city” development     

Casey R. Lynch 《Urban geography》2013,34(8):1148-1167

Increasingly over the past few years the building of new cities “from scratch” has become a key strategy to promote development across much of the Global South. While several projects are currently under construction, many others exist primarily as proposals awaiting adequate investment or government action. This paper builds on previous literature that considers representations of such projects – promotional materials, digitally-produced video simulations, and master plans – as key components in the production of imagined urban futures. Through an exploration of the proposed Zone for Economic Development and Employment (ZEDE) in Honduras, this article demonstrates a feminist geopolitical approach focused on how such representations of utopian urbanism circulate through the local communities slated for new city development. I examine how representations of future urban spaces and future urban governance regimes become appropriated by local residents in organizing opposition or otherwise making sense of the proposed project’s potential impact on their lives.  相似文献   

Uneven development of the sustainable city: shifting capital in Portland,Oregon     

Erin Goodling  Jamaal Green 《Urban geography》2013,34(4):504-527

Portland, Oregon, is renowned as a paradigmatic “sustainable city.” Yet, despite popular conceptions of the city as a progressive ecotopia and the accolades of planners seeking to emulate its innovations, Portland’s sustainability successes are inequitably distributed. Drawing on census data, popular media, newspaper archives, city planning documents, and secondary source histories, we attempt to elucidate the structural origins of Portland’s “uneven development,” exploring how and why the urban core of this paragon of sustainability has become more White and affluent while its outer eastside has become more diverse and poor. We explain how a “sustainability fix”—in this case, green investment in the city’s core—ultimately contributed to the demarcation of racialized poverty along 82nd Avenue, a major north–south arterial marking the boundary of East Portland. Our account of structural processes taking place at multiple scales contributes to a growing body of literature on eco-gentrification and displacement and inner-ring suburban change while empirically demonstrating how Portland’s advances in sustainability have come at the cost of East Portland’s devaluation. Our “30,000 foot” perspective reveals systemic patterns that might then guide more fine-grained analyses of particular political-socio-cultural processes, while providing cautionary insights into current efforts to extend the city’s sustainability initiatives using the same green development model.  相似文献   

Lagrangian dispersion in sheared flow     

Daniel R. Lynch  Keston W. Smith 《Continental Shelf Research》2010

Two-dimensional Lagrangian trajectories are studied near an idealized ocean front with shear and convergence plus an uncorrelated random walk. Applications include fixed-depth drifters and plankton patches with perfect depth regulation.  相似文献   

Water Level Declines in the High Plains Aquifer: Predevelopment to Resource Senescence   总被引：1，自引：0，他引：1       下载免费PDF全文

Erin M. K. Haacker  Anthony D. Kendall  David W. Hyndman 《Ground water》2016,54(2):231-242

A large imbalance between recharge and water withdrawal has caused vital regions of the High Plains Aquifer (HPA) to experience significant declines in storage. A new predevelopment map coupled with a synthesis of annual water levels demonstrates that aquifer storage has declined by approximately 410 km³ since the 1930s, a 15% larger decline than previous estimates. If current rates of decline continue, much of the Southern High Plains and parts of the Central High Plains will have insufficient water for irrigation within the next 20 to 30 years, whereas most of the Northern High Plains will experience little change in storage. In the western parts of the Central and northern part of the Southern High Plains, saturated thickness has locally declined by more than 50%, and is currently declining at rates of 10% to 20% of initial thickness per decade. The most agriculturally productive portions of the High Plains will not support irrigated production within a matter of decades without significant changes in management.  相似文献   

A general scheme for modelling γ-ray burst prompt emission     

Pawan Kumar  Erin McMahon 《Monthly notices of the Royal Astronomical Society》2008,384(1):33-63

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A multi-perspective examination of heat waves affecting Metro Vancouver: now into the future     

Ronald E. Stewart  Daniel Betancourt  James B. Davies  Deborah Harford  Yaheli Klein  Robert Lannigan  Linda Mortsch  Erin O’Connell  Kathy Tang  Paul H. Whitfield 《Natural Hazards》2017,87(2):791-815

Using studies of places where heat waves are common, projected changes in heat waves in Metro Vancouver are assessed from a multi-disciplinary perspective with respect to the potential impacts of the physical change on the people and infrastructure with the intention of being better prepared for future events. Trends in maximum temperature parameters for Metro Vancouver for the past 75 years are generally not statistically significant; however, projections for 2041–2060 and 2081–2100 suggest that the region will experience such events more frequently in the future due to climate change. While Metro Vancouver, British Columbia (BC) generally does not typically experience heat waves it was strongly affected by a major heat event in July 2009, with temperature records being broken at Vancouver (≥31 °C) on the coast and at Abbotsford (≥36 °C) 65-km inland. A lack of sea breeze during this event meant that there was no cooling effect, and land surface temperatures over the downtown area approached 40 °C and excess deaths occurred. Many victims were either in the 65–74 age category, the vulnerable poor, or people with mental health issues. Because these events are rare, many buildings lack air-conditioning, and residents of Metro Vancouver under-anticipate their vulnerability. The costs of health-related impacts outweighed those related to higher electricity usage.  相似文献   

Changes in the red giant and dusty environment of the recurrent nova RS Ophiuchi following the 2006 eruption     

M. T. Rushton  B. Kaminsky  D. K. Lynch †  Ya. V. Pavlenko  A. Evans  S. P. S. Eyres  C. E. Woodward †  Ray W. Russell †  Richard J. Rudy †  Michael L. Sitko †  T. Kerr 《Monthly notices of the Royal Astronomical Society》2010,401(1):99-104

We present near-infrared spectroscopy of the recurrent nova RS Ophiuchi (RS Oph) obtained on several occasions after its latest outburst in 2006 February. The  1–5 μ  m spectra are dominated by the red giant, but the H  i , He  i and coronal lines present during the eruption are present in all our observations. From the fits of the computed infrared spectral energy distributions to the observed fluxes, we find   T _eff= 4200 ± 200   K for the red giant. The first overtone CO bands at  2.3 μ  m, formed in the atmosphere of the red giant, are variable. The spectra clearly exhibit an infrared excess due to dust emission longward of  5 μ  m; we estimate an effective temperature for the emitting dust shell of 500 K, and find that the dust emission is also variable, being beyond the limit of detection in 2007. Most likely, the secondary star in RS Oph is intrinsically variable.  相似文献   

Modeling anthropogenic boron in groundwater flow and discharge at Volusia Blue Spring (Florida,USA)     

Erin M. Reed  Dingbao Wang  Steven J. Duranceau 《Hydrogeology Journal》2017,25(1):91-101

Volusia Blue Spring (VBS) is the largest spring along the St. Johns River in Florida (USA) and the spring pool is refuge for hundreds of manatees during winter months. However, the water quality of the spring flow has been degraded due to urbanization in the past few decades. A three-dimensional contaminant fate and transport model, utilizing MODFLOW-2000 and MT3DMS, was developed to simulate boron transport in the Upper Florida Aquifer, which sustains the VBS spring discharge. The VBS model relied on information and data related to natural water features, rainfall, land use, water use, treated wastewater discharge, septic tank effluent flows, and fertilizers as inputs to simulate boron transport. The model was calibrated against field-observed water levels, spring discharge, and analysis of boron in water samples. The calibrated VBS model yielded a root-mean-square-error value of 1.8 m for the head and 17.7 μg/L for boron concentrations within the springshed. Model results show that anthropogenic boron from surrounding urbanized areas contributes to the boron found at Volusia Blue Spring.  相似文献   

The antiquity of man in South America     

Thomas F. Lynch 《Quaternary Research》1974,4(3):356-377

The initial peopling of South America is reviewed in terms of geochronological and archaeological data. The problem is put in historical perspective and a systematic evaluation is made of the latest typologically oriented arguments for the presence of preprojectile point complexes. Field evidence is very weak for early Biface and Chopper traditions. There is better support for an early Flake tradition, but it is not likely to precede the use of stone projectile points.Radiocarbon dates and “terrace dating” should be used only with great caution and careful attention to the nature of cultural and stratigraphic associations. Uncritical acceptance of determinations on bone and soil samples has led to extremely problematic cultural reconstructions. Emphasis on stratified sites with finished artifacts, faunal assocations, and charcoal dates leads to a reconstruction at odds with those presented in recent textbooks. It is concluded that the bulk of solid evidence favors the entry of man as a big game hunter using stone projectile points and having an adaptation much like that of the Paleo-Indians of North America.  相似文献   

The influence of hydrocyclone diameter on reduced-efficiency curves     

A.J. Lynch  T.C. Rao  K.A. Prisbrey 《International Journal of Mineral Processing》1974,1(2):173-181

Classification tests have been carried out on limestone in 10.2-, 15.2-, 25.4- and 38.1-cm “Krebs” hydrocyclones in order to study the effect of cyclone diameter on the reduced-efficiency curve. Parameters which were varied included the vortex finder and spigot diameter, throughput and feed-solids content, but the feed size remained constant. The reduced-efficiency curve was found to be constant for all tests and the conclusion is that for constant feed size this curve is a function of the material being classified only for geometrically similar cyclones and is independent of the cyclone diameter.  相似文献