Earth Science Education in Africa: an overview     

Hugh Rollinson  Pascal Affaton  Sam Ayonghe  Marian Tredoux  Kevin Walsh 《Journal of African Earth Sciences》1999,28(4):773-776

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High-technology industries in Korea: Spatial linkages and policy implications     

Sam Ock Park 《Geoforum》1991,22(4)

This study seeks to analyze spatial linkages of high-technology (high-tech) firms in Korea and to suggest directions for high-tech industrial development policies for regional economic development. The data were derived from questionnaire and interview surveys conducted in high-tech firms throughout Korea. Patterns of spatial linkages and the intensity of local linkages of input materials, output sales, business services, and high-tech labor forces were analyzed. Characteristics of regions and high-tech firms are identified as significant dimensions in determining the intensity of local linkages of input and output materials. Four types of possible high-tech clusters, self-supporting, redeveloping, assembling, and dependent, are also identified based on the characteristics of regions and high-tech firms. Policy implications for successful high-tech industrial development in Korea are suggested from a consideration of the four types of high-tech cluster.  相似文献   

Interpretation of Hydrochemical Facies by Factor Analysis   总被引：17，自引：0，他引：17  

Matthew G. Dalton  Sam B. Upchurch 《Ground water》1978,16(4):228-233

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Influence of Regolith Properties on Migration of Septic Tank Effluent     

Raymond A. Rea  Sam B. Upchurch 《Ground water》1980,18(2):118-125

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A study of time dependence during serial needle ice events     

Dr. Sam I. Outcalt 《Meteorology and Atmospheric Physics》1970,19(1):329-337

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Variation of coastal atmospheric boundary layer characteristics with convective activity along the west coast of India during the Arabian Sea Monsoon Experiment (ARMEX) 2002     

N. V. Sam  U. C. Mohanty  A. Routray  S. Basu 《Natural Hazards》2007,42(2):361-378

This paper investigates the characteristic features of the coastal atmospheric boundary layer (CABL) along the west coast of India during the south-west monsoon (SWM) 2002. Extensive surface and upper-air findings were obtained during the same period from the Arabian Sea Monsoon Experiment (ARMEX; 15th June to 15th August 2002) 2002. The operational general circulation model (GCM) of the National Centre for Medium Range Weather Forecasting (NCMRWF) was used in this study to see the spatial variation of the CABL during two specific convective episodes that led to heavy rainfall along the west coast of India. The impact of a non-local closure (NLC) scheme employed in the NCMRWF GCM was carried out in simulating the CABL. The same episodes were also simulated using a similar parameterization scheme employed in the high resolution mesoscale modelling system (MM5). The diurnal variation of CABL is better represented from MM5 simulation. Comparing the MM5 simulation with that of the coarser grid NCMRWF GCM, we observed that the NCMRWF GCM underestimates the values of both latent heat flux (LHF) and the coastal atmospheric boundary layer height (CABLH). Results from MM5 therefore indicate that the best way to move forward in addressing the short-comings of coarse grid-scale GCMs is to provide a parameterization of the diurnal effects associated with convection processes.  相似文献   

Evaluation of optical remote sensing-based shallow water bathymetry for recursive mapping     

Lydia Sam  Ganesh Prusty  Nidhi Gahlot 《国际地球制图》2018,33(7):737-753

Water depth estimation using optical remote sensing offers a reliable and efficient means of mapping coastal zones. Here, we aim to find a suitable model for fast and practical bathymetry of an estuary using Indian Remote Sensing Satellite (IRS) Linear Imaging Self Scanning Sensor (LISS-3) images. The study examines three different models; (1) least square regression model, (2) spectral band-ratio method and (3) multi-tidal bathymetry model. The findings are supported with in situ observed depth values and statistical estimates. Although the least square regression model has provided best results with root mean square error (RMSE) of 0.4 m, it requires a large number of observed data points for absolute depth estimation. Spectral band-ratio and multi-tidal model provides results with RMSEs 2.1 and 0.9 m, respectively. The present investigation demonstrates that multi-date imagery exploitation at disparate tide levels is the best estimation technique for recursive shallow water bathymetry where in situ observation is not possible.  相似文献   

Water circulation in karst systems: comparing physicochemical and environmental isotopic data interpretation     

Joseph Asante  Sam Dotson  Evan Hart  David K. Kreamer 《Environmental Earth Sciences》2018,77(11):421

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“A shovel or a shopping cart”: lessons from ten years of disaster response by a student-led volunteer group     

Carlton  Sally  Nissen  Sylvia  Wong  Jennifer H. K.  Johnson  Sam 《Natural Hazards》2022,111(1):33-50

Natural Hazards - Recent years have seen growing interest in enabling volunteers to play a more pronounced role in disaster response, and yet efforts to systematically analyse this crisis volunteer...  相似文献   

A critical review and re-investigation of the Pleistocene deposits between Cranfield Point and Kilkeel,Northern Ireland: Implications for regional sea-level models and glacial reconstructions of the northern Irish Sea basin     

Jon W. Merritt  Sam Roberson  Mark R. Cooper 《Proceedings of the Geologists' Association. Geologists' Association》2018,129(5):583-609

The coastline of County Down includes sites that are pivotal to understanding the history of the last glaciation of the northern Irish Sea Basin in relation to relative sea level and regional glacial readvances. The cliff sections display evidence that has been used to underpin controversial models of glaciomarine sedimentation in isostatically-depressed basins followed by emergent marine and littoral environments. They also provide crucial evidence claimed to constrain millennial-scale ice sheet oscillations associated with uniquely large and rapid sea-level fluctuations. This paper reviews previous work and reports new findings that generally supports the ‘terrestrial’ model of glaciation, involving subglacial accretion and deformation of sediment beneath grounded ice. Deep troughs were incised into the till sheet during a post Late Glacial Maximum draw-down of ice into the Irish Sea Basin. Ice retreat was accompanied by glaciomarine accretion of mud in the troughs during a period of high relative sea level. The trough-fills were over-ridden, compacted, deformed and truncated during a glacial re-advance that is correlated with the Clogher Head Readvance. Grounding-line retreat accompanied by rapid subaqueous ice-proximal sedimentation preserved a widespread subglacial stone pavement. Raised beach gravels cap the sequence. The evidence supports an uninterrupted fall in relative sea level from c. 30?m that is consistent with sea level curves predicted by current glacio-isostatic adjustment modelling. Critical evidence previously cited in support of subaerial dissection of the troughs, and hence rapid fall and rise in relative sea level prior to the deposition of the glaciomarine muds, is not justified.  相似文献