Lacan on urban development and national identity in a global city: Integrated Resorts in Singapore     

Nathan F. Bullock 《Singapore journal of tropical geography》2014,35(2):213-227

Lacanian psychoanalysis has been used in film, literature and other areas of social thought, but rarely in the domain of urban studies and human/cultural geography. Following its introduction by urban planners Michael Gunder and Jean Hillier, I apply the theory of the four discourses and the mirror stage of development to Singapore's urban development of the two Integrated Resorts at Marina Bay and Sentosa. The decision to allow gambling and build casinos was a contentious one and provides a point of departure for insight into the identity issues and planning decision making processes in Singapore. I critically analyse the rhetoric of the public debate from 2004–2005 to draw conclusions about the government's self‐perception of Singapore as a city‐state and the manifestation of this identity through the creation of cosmopolitan spaces as an attempt to project that identity onto its citizens. The aim of Lacanian psychoanalysis is to provide an understanding and recognition by analysis to enable a change of signifiers, values and ideology among the masters and the subjects to better represent the true needs and wants of the community. This reflective position enables a movement toward postcolonial urban studies and planning.  相似文献   

Surface Heterogeneity Effects on Regional-Scale Fluxes in the Stable Boundary Layer: Aerodynamic Roughness Length Transitions   总被引：1，自引：1，他引：0  

Nathan E. Miller  Rob Stoll 《Boundary-Layer Meteorology》2013,149(2):277-301

The effects of abrupt streamwise transitions of the aerodynamic roughness length ( $z_\mathrm{o}$ z o ) on the stable atmospheric boundary layer are evaluated using a series of large-eddy simulations based on the first Global Energy and Water Cycle Experiment Atmospheric Boundary Layer intercomparison study (GABLS1). Four $z_\mathrm{o}$ z o values spanning three orders of magnitude are used to create all possible binary distributions with each arranged into patches of characteristic length scales equal to roughly one-half, one, and two times the equivalent homogeneous boundary-layer height. The impact of the heterogeneity on mean profiles of wind speed and temperature, on surface fluxes of heat and momentum, and on internal boundary-layer dynamics are considered. It is found that $z_\mathrm{o}$ z o transitions do not significantly alter the functional relationship between the average surface fluxes and the mean profiles of wind speed and potential temperature. Although this suggests that bulk similarity theory is applicable for modelling the stable boundary layer over $z_\mathrm{o}$ z o heterogeneity, effective surface parameters must still be specified. Existing models that solve for effective roughness lengths of momentum and heat are evaluated and compared to values derived from the simulation data. The existing models are unable to accurately reproduce both the values of the effective aerodynamic roughness lengths and their trends as functions of patch length scale and stability. A new model for the effective aerodynamic roughness length is developed to exploit the benefits of the other models tested. It accurately accounts for the effects of the heterogeneity and stratification on the blending height and effective aerodynamic roughness length. The new model provides improved average surface fluxes when used with bulk similarity.  相似文献   

High-resolution observations of aggregate flux during a sub-polar North Atlantic spring bloom   总被引：1，自引：0，他引：1  

Nathan Briggs  Mary Jane PerryIvona Cetini?  Craig LeeEric D'Asaro  Amanda M. GrayEric Rehm 《Deep Sea Research Part I: Oceanographic Research Papers》2011,58(10):1031-1039

An aggregate flux event was observed by ship and by four underwater gliders during the 2008 sub-polar North Atlantic spring bloom experiment (NAB08). At the height of the diatom bloom, aggregates were observed as spikes in measurements of both particulate backscattering coefficient (b_bp) and chlorophyll a fluorescence. Optical sensors on the ship and gliders were cross-calibrated through a series of simultaneous profiles, and b_bp was converted to particulate organic carbon. The aggregates sank as a discrete pulse, with an average sinking rate of ∼75 m d⁻¹; 65% of aggregate backscattering and 90% of chlorophyll fluorescence content was lost between 100 m and 900 m. Mean aggregate organic carbon flux at 100 m in mid-May was estimated at 514 mg C m⁻² d⁻¹, consistent with independent flux estimates. The use of optical spikes observed from gliders provides unprecedented coupled vertical and temporal resolution measurements of an aggregate flux event.  相似文献   

Changes in population evacuation potential for tsunami hazards in Seward, Alaska, since the 1964 Good Friday earthquake   总被引：1，自引：0，他引：1  

Nathan J. Wood  Mathew C. Schmidtlein  Jeff Peters 《Natural Hazards》2014,70(2):1031-1053

Pedestrian evacuation modeling for tsunami hazards typically focuses on current land-cover conditions and population distributions. To examine how post-disaster redevelopment may influence the evacuation potential of at-risk populations to future threats, we modeled pedestrian travel times to safety in Seward, Alaska, based on conditions before the 1964 Good Friday earthquake and tsunami disaster and on modern conditions. Anisotropic, path distance modeling is conducted to estimate travel times to safety during the 1964 event and in modern Seward, and results are merged with various population data, including the location and number of residents, employees, public venues, and dependent care facilities. Results suggest that modeled travel time estimates conform well to the fatality patterns of the 1964 event and that evacuation travel times have increased in modern Seward due to the relocation and expansion of port and harbor facilities after the disaster. The majority of individuals threatened by tsunamis today in Seward are employee, customer, and tourist populations, rather than residents in their homes. Modern evacuation travel times to safety for the majority of the region are less than wave arrival times for future tectonic tsunamis but greater than arrival times for landslide-related tsunamis. Evacuation travel times will likely be higher in the winter time, when the presence of snow may constrain evacuations to roads.  相似文献   

Hydrologic Variability and Its Control of Phytoplankton Community Structure and Function in Two Shallow,Coastal, Lagoonal Ecosystems: The Neuse and New River Estuaries,North Carolina,USA   总被引：1，自引：0，他引：1  

Hans W. Paerl  Nathan S. Hall  Benjamin L. Peierls  Karen L. Rossignol  Alan R. Joyner 《Estuaries and Coasts》2014,37(1):31-45

Hydrologic conditions, especially changes in freshwater input, play an important, and at times dominant, role in determining the structure and function of phytoplankton communities and resultant water quality of estuaries. This is particularly true for microtidal, shallow water, lagoonal estuaries, where water flushing and residence times show large variations in response to changes in freshwater inputs. In coastal North Carolina, there has been an increase in frequency and intensity of extreme climatic (hydrologic) events over the past 15 years, including eight hurricanes, six tropical storms, and several record droughts; these events are forecast to continue in the foreseeable future. Each of the past storms exhibited unique hydrologic and nutrient loading scenarios for two representative and proximate coastal plain lagoonal estuaries, the Neuse and New River estuaries. In this synthesis, we used a 13-year (1998–2011) data set from the Neuse River Estuary, and more recent 4-year (2007–2011) data set from the nearby New River Estuary to examine the effects of these hydrologic events on phytoplankton community biomass and composition. We focused on the ability of specific taxonomic groups to optimize growth under hydrologically variable conditions, including seasonal wet/dry periods, episodic storms, and droughts. Changes in phytoplankton community composition and biomass were strongly modulated by the amounts, duration, and seasonality of freshwater discharge. In both estuaries, phytoplankton total and specific taxonomic group biomass exhibited a distinctive unimodal response to varying flushing rates resulting from both event-scale (i.e., major storms, hurricanes) and more chronic seasonal changes in freshwater input. However, unlike the net negative growth seen at long flushing times for nano-/microphytoplankton, the pigments specific to picophytoplankton (zeaxanthin) still showed positive net growth due to their competitive advantage under nutrient-limited conditions. Along with considerations of seasonality (temperature regimes), these relationships can be used to predict relative changes in phytoplankton community composition in response to hydrologic events and changes therein. Freshwater inputs and droughts, while not manageable in the short term, must be incorporated in water quality management strategies for these and other estuarine and coastal ecosystems faced with increasing frequencies and intensities of tropical cyclones, flooding, and droughts.  相似文献   

Benthic foraminifera and geochemical studies with influence on pollution studies along the coast of Cuddalore,Tamil Nadu-ITS,India     

M. Suresh Gandhi  A. Sonia Nathan 《Arabian Journal of Geosciences》2014,7(3):917-925

Foraminifers, being sensitive to minute changes, either undergo morphological changes or even disappear from the area completely due to pollution or under unfavourable conditions. The characteristics of foraminifers to incorporate the signature of presence of pollutants are considered to be an effective tool for temporal pollution monitoring studies. Totally, 12 offshore samples (both sediment and water) were taken along a normal profile along the coast of Cuddalore for pollution studies. Apart from foraminiferal studies, geochemical studies of the sediments collected are also undertaken to correlate and substantiate the findings. The near-shore area has a higher concentration of trace elements. If these concentrations exceed or go below permissible limits, it is collateral for the marine community and for those who consume these marine resources. The concentration of trace elements like lead, zinc, manganese, copper, chromium and nickel was illustrated to give an idea of the trace element concentration of the study area. The sedimentological studies reveal the organic matter and calcium carbonate content of the samples, and the bottom water measurements reveal the temperature, salinity and dissolved oxygen of sample locations. These are used to determine whether the conditions prevailing could sustain life. The ratio of living to dead species is also determined and correlated with sedimentological and geochemical parameters. Pollution studies have given way to identify morphological abnormalities in the species mainly in Spiroloculina, Quinqueloculina, Elphidium, etc. but we could not find many effects among the faunal assemblages because of the nature of the sediments found in that area.  相似文献   

Keck spectroscopy and imaging of faint galaxies identified as microjansky radio sources     

Nathan D.Roche  James D.Lowenthal  David C.Koo 《Monthly notices of the Royal Astronomical Society》2002,330(2):307-328

  相似文献   

Collisions and mergers of disk galaxies: Hydrodynamics of star forming gas     

Susan A. Lamb  Nathan C. Hearn 《Astrophysics and Space Science》2003,284(2):479-482

We summarize the results of numerical simulations of colliding gas-rich disk galaxies in which the impact velocity is set parallel to the spin axes of the two galaxies. The effects of varying the impact speed are studied with particular attention to the resulting gaseous structures and shockwave patterns, and the time needed to produce these structures. The simulations employ an N-body treatment of the stars and dark matter, together with an SPH treatment of the gas, in which all components of the models are gravitationally active. The results indicate that for such impact geometries, collisions can lead to the very rapid formation of a central, rapidly rotating, dense gas disk, and that in all cases extensive star formation is predicted by the very high gas densities and prevalence of shocks, both in the nucleus and out in the galactic disks. As the dense nucleus is forming, gas and stars are dispersed over very large volumes, and only fall back towards the nucleus over long times. In the case of low impact velocities, this takes an order of magnitude more time than that needed for the formation of a dense nucleus. This revised version was published online in August 2006 with corrections to the Cover Date.  相似文献   

Rainfall patterns in the Southern Amazon: a chronological perspective (1971–2010)     

Nathan S. Debortoli  Vincent Dubreuil  Beatriz Funatsu  Florian Delahaye  Carlos Henke de Oliveira  Saulo Rodrigues-Filho  Carlos Hiroo Saito  Raquel Fetter 《Climatic change》2015,132(2):251-264

  相似文献   

A census of the Carina Nebula – I. Cumulative energy input from massive stars     

Nathan Smith † 《Monthly notices of the Royal Astronomical Society》2006,367(2):763-772

  相似文献