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Mineral exploration in RDTs is challenging because of the lack of bedrock outcrop, and the difficulty of linking surface regolith geochemistry to the geology at depth.
One potential difficulty is that the effects of surface chemistry and surface topography may become convoluted.
The differences are due to the difficulty in determining the ratio of surface to upper-level wind speeds in typhoons, particularly for regions of complex topography.
However, the FDM process exhibits low levels of surface finishing, difficulty in getting complex and/or small geometries and low consistency in "slim" elements of the parts.
Obtaining the full spatial coverage of daily surface ozone fields is challenging because of the sparsity of the surface monitoring network and the difficulty in direct satellite retrievals of surface ozone.
In spite of the high number on plasma spray method of studies to date, the results in the literature demonstrate difficulties in deciding the optimum value of surface roughness for better osseointegration yet decrease bacterial adhesion.
The bias may be induced by the difficulties of AOD retrievals over sandy surfaces or by the application of the conversion factors [ 28].
The use of rare earth-containing perovskite oxides as total oxidation catalysts faces to the difficulty of obtaining high surface area materials and the need of calcination at high temperatures for its synthesis.
When the number of surface parameters exceeds the number of collected surface observations, a difficulty with the dimensionality emerges in classification.
