Josef Steinbach (1999), Uneven Worlds. Theories, empirical analysis and perspectives to regional development     

Ron Boschma 《GeoJournal》2000,50(1):69-70

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Bioremediation perspective of historically contaminated sediment with polycyclic aromatic hydrocarbons     

Snezana Maletic  Jelena Beljin  Dragana Tamindzija  Marko Grgic  Jelena Molnar Jazic  Marijana Kragulj Isakovski  Srdan Roncevic 《国际泥沙研究》2021,36(4):479-488

The purpose of the current study is to compare the influence of different aerobic conditions(biostimulation(BS),bioaugmentation(BA),and a combination of biostimulation and bioaugmentation(BB))on polycyclic aromatic hydrocarbons(PAH)degradation and compare the degraded amount with single step XAD-4 extraction as a new tool for bioavailability assessment for chronically contaminated sediment samples obtained from territory of Autonomous Province Vojvodina of Serbia(S1,S2,and S3).A great number of papers dealing with biodegradation of PAHs in spiked sediment or soil have been published,but to the authors’knowledge,a limited number of papers studied aged,historically polluted sediment and a sum of chosen U.S.Environmental Protection Agency(USEPA)PAHs.A significant reduction(up to67%)in PAH concentration was observed,while the percentage of reduction varied depending on the sediment sample and treatment used.BS treatment successfully stimulated growth of indigenous bacteria.Further,PAH-degrading strain Sphingomonas paucimobilis F8 inoculated in BA and BB treatment survived for up to 7 weeks after it was suppressed by unfavorable conditions or native microbes.Degraded amounts generally showed good correlation with results obtained from XAD-4 extraction.Results obtained in the current study represent a good start for standardizing a XAD-4 extraction technique as a simplified,easier,and lower cost method for bioavailability assessment.  相似文献   

Returns from a speculation     

Ron Johnston  Derek Gregory  Geraldine Pratt  Michael Watts  Sarah Whatmore 《Geoforum》2008,39(3):1105-1107

A reply to a recent paper by Setten.  相似文献   

Fine-Scale Measurements Of Turbulence In The Lower Troposphere: An Intercomparison Between A Kite- And Balloon-Borne, And A Helicopter-Borne Measurement System     

Andreas Muschinski  Ror Frehich  Mike Jensen  Ron Hugo  Axel Hoff  Frank Eaton  Ben Balsley 《Boundary-Layer Meteorology》2001,98(2):219-250

Two state-of-the-art, high-resolution, in situ turbulence measurement systems, which can be deployed at altitudes well above the atmospheric surface layer, are compared: the Tethered Lifting System (TLS) of the Cooperative Institute for Research in Environmental Sciences (CIRES)at the University of Colorado, Boulder, Colorado, and the helicopter-borneturbulence measurement system HELIPOD of the Technical UniversityBraunschweig, Germany, and the University of Hanover, Germany. Whilethe CIRES TLS is a fixed-point platform, HELIPOD is a moving platform.On the basis of data taken with the two systems in separate field campaigns,the system capabilities are quantified and discussed. Criteria for instrumentalrequirements are presented. It is shown that both the CIRES TLS and HELIPODare well suited for measuring fine-scale turbulence that is characterized by very small temperature structure parameters 10⁶ K² m^–2/3 and smaller) and very small energy dissipation rates (10^-7 m² s^-3 and smaller). The authors are not aware of any other turbulence measurement systems that have similar capabilities and can be deployed at altitudes of up to several kilometres. The HELIPOD is ideal for high-resolution horizontal measurements while the TLS is ideal for high-resolution vertical measurements using multiple sensors attached to a suspended line.  相似文献   

Migration velocity analysis using a genetic algorithm     

Paul Docherty  Ron Silva  Satish Singh  Zhong-Min Song  Margaret Wood 《Geophysical Prospecting》1997,45(5):865-878

Migration velocity analysis, a method for determining long wavelength velocity structure, is a critical step in prestack imaging. Solution of this inverse problem is made difficult by a multimodal objective function; a parameter space often vast in extent; and an evaluation procedure for candidate solutions, involving the calculation of depth-migrated image gathers, that can be prohibitively expensive. Recognizing the global nature of the problem, we employ a genetic algorithm (GA) in the search for the optimum velocity model. In order to describe a model efficiently, regions of smooth variation are identified and sparsely parametrized. Region boundaries are obtained via map migration of events picked on the zero-offset time section. Within a region, which may contain several reflectors, separate components describe long and short wavelength variations, eliminating from the parameter space, models with large velocity fluctuations. Vital to the success of the method is rapid model evaluation, achieved by generating image gathers only in the neighbourhood of specific reflectors. Probability of a model, which we seek to maximize, is derived from the flatness of imaged events. Except for an initial interpretation of the zero-offset time section, our method is automatic in that it requires no picking of residual moveout on migrated gathers. Using an example data set from the North Sea, we show that it is feasible to solve for all velocity parameters in the model simultaneously: the method is global in this respect also.  相似文献   

Europe and the environment — into the next century : ‘Global environmental change’, presidential session of the annual conference of the institute of British geographers, Swansea, Wales, 8 January 1992     

Ron Cooke 《Global Environmental Change》1992,2(4)

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Reconstruction of 1852 Banda Arc megathrust earthquake and tsunami     

TszMan L. Fisher  Ron A. Harris 《Natural Hazards》2016,83(1):667-689

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Zip-Code Areas As Statistical Regions     

Ron Abler 《The Professional geographer》1970,22(5):270-274

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3-D Shoreline Extraction from IKONOS Satellite Imagery   总被引：1，自引：0，他引：1  

Ron Li  Kaichang Di  Ruijin 《Marine Geodesy》2003,26(1):107-115

Shorelines are recognized as unique features on Earth. They have valuable properties for a diverse user community. At present, photogrammetry is the most popular technique used to capture a shoreline. With improved resolution and accuracy, commercial high-resolution satellite imagery is demonstrating a great potential in the photogrammetry application domain. One example is the utilization of IKONOS satellite imagery in shoreline extraction. IKONOS panchromatic imagery has a resolution of approximately one meter as well as the capabilities of stereo imaging. This article presents the results of an experiment in which we attempted to improve IKONOS Rational Functions (RF) for a better ground accuracy and to employ the improved RF for 3-D shoreline extraction using 1-meter panchromatic stereo images in a Lake Erie coastal area. Two approaches were investigated. One was to rectify the ground coordinates derived from vendor-provided RF coefficients using ground control points (GCPs). The other was to refine the RF coefficients using the GCPs. We compare the results from these two approaches. An assessment of the shoreline extracted from IKONOS images compared with the existing shoreline is also conducted to demonstrate the potential of the IKONOS imagery for shoreline mapping.  相似文献   

Wave groupiness variations in the nearshore: Reply to the comments of J.R. Medina     

Jeffrey H. List   《Coastal Engineering》1992,18(3-4)

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