排序方式： 共有34条查询结果，搜索用时 14 毫秒
31.
Managing marine genetic diversity: time for action? 总被引：1，自引：0，他引：1
Kenchington Ellen; Heino Mikko; Nielsen Einar Eg 《ICES Journal of Marine Science》2003,60(6):1172-1176
32.
Soile Tissari Vesa Nykänen Jouni Lerssi Mikko Kolehmainen 《Natural Resources Research》2007,16(2):159-169
Weights-of-Evidence (WofE) and Radial Basis Function Link Net (RBFLN) were applied to soil group mapping in eastern Finland.
The data consisted of low altitude airborne geophysical measurements, Landsat 5 TM-satellite image, and digital elevation
model (DEM) and slope information derived from it. Probability maps were constructed for each soil group one by one and combined
into a prediction map of soil groups using maximum posterior probability (WofE) or pattern membership (RBFLN). Self-Organizing
Map (SOM) and Sammon’s Mapping were applied for selecting the data sets for modeling and visualizing the data. The soil types
belonging to each soil group used in the Arc-SDM modeling were defined by clusters revealed by the SOM and Sammon’s Mapping
algorithms. The soil types with similar characters were collected in the same cluster. Numerical evaluation of the models’
performance was performed using the confusion matrix. The Ratio of Correct Classifications (RCC) for the best WofE model was
0.64 in the training area and 0.61 in the testing area. The RCC for the best RBFLN model was 0.62. Modeling of soil groups
using Arc-SDM is time consuming because models need to be constructed for each soil group before combining them into a final
prediction map. In this study a simple method was tested for combining the maps. In the future, more attention should be paid
to combining the posterior probability models and also to selecting data sets used for modeling. 相似文献
33.
The degradation of organic wastes and the corrosion of metallic wastes and steel containers in low and intermediate level radioactive waste (LLW/ILW) repositories are important processes that affect repository geochemistry and the speciation and transport of radionuclides. Gas is generated in association with these degradation processes and this has the potential to overpressure the repository, which can promote transport of groundwater and gas, and consequently radionuclide transport. Microbial activity plays an important role in organic degradation, corrosion and gas generation through the mediation of reduction–oxidation reactions. 相似文献
34.
Colby A. Smith Martin Sundh Henrik Mikko 《International Journal of Earth Sciences》2014,103(6):1711-1724
In Sweden, knowledge of the location and timing of glacially induced faulting and seismicity is critical to effective engineering of a long-term nuclear disposal facility. To improve understanding and modeling of the complex ice-induced and tectonic stresses associated with glacially induced faulting, field studies detailing the location and timing of movement of such structures are required. Although the fault has not been confirmed in the bedrock, multi-proxy surficial geologic evidence indicates that the recently discovered scarp in Bollnäs is such a structure. Machine-excavated trenches across the scarp reveal landsliding down the scarp and, in one location, faulted and vertically offset fine-grained glacial sediments. The presence of water-escape structures in trenches excavated on a topographic high strongly suggests a co-seismic origin derived from earthquake magnitudes >5.5. Numerous landslides in till exist in the region as well. Four slopes with landslides were examined in detail, and the factors of safety for these slopes indicate stable conditions and suggest a seismic trigger. Basal radiocarbon dates from peat bogs located stratigraphically above the landslides provide minimum limiting ages for the co-seismic landslides. The oldest date indicates sliding prior to 10,180 calendar years before the present. The proposed Bollnäs Fault is 400 km south of the so called Lapland Fault Province. To date, it is the southernmost confirmed glacially induced fault in Sweden. The results of this study are consistent with existing modeling results that indicate fault instability in this region of central Sweden following deglaciation. 相似文献