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2. Multi-criteria aggregation for sensistive parcel-based census data

Author

Indermühle, Selina, Laube, Patrick, Geilhausen, Martin, Zwicker, Thomas, Indermühle, Selina, Laube, Patrick, Geilhausen, Martin, and Zwicker, Thomas

Abstract

Modern urban planning considers various socio-economic issues and hence requires fine-grained, potentially sensitive spatial data, raising the disclosure dilemma: Whilst it is imperative to aggregate fine-grained sensitive records large enough to avoid disclosure, aggregation blurs the information, potentially hindering insights about spatially explicit relationships. MASC is an aggregation algorithm for sensitive data, balancing five aggregation criteria.

Published
2018

4. Multi-criteria aggregation for sensistive parcel-based census data

Author

Indermühle, Selina, Laube, Patrick, Geilhausen, Martin, and Zwicker, Thomas

Subjects
711: Raumplanung (Städtebau), Cartographic generalization, Census data
Abstract

Modern urban planning considers various socio-economic issues and hence requires fine-grained, potentially sensitive spatial data, raising the disclosure dilemma: Whilst it is imperative to aggregate fine-grained sensitive records large enough to avoid disclosure, aggregation blurs the information, potentially hindering insights about spatially explicit relationships. MASC is an aggregation algorithm for sensitive data, balancing five aggregation criteria.

Published
2014

6. Enhanced oil-mineral aggregation with modified bentonite.

Author

Li Chen, Yanbo Zhou, Xiaoqian Wang, Zwicker, Thomas, and Jun Lu

Subjects
MINERAL aggregates, BENTONITE, ELECTRIC properties, AMMONIUM bromide, FLUORESCENCE microscopy
Abstract

The application of modified-bentonite-enhanced oil dispersion in water and oil-mineral aggregate (OMA) formation was studied in the laboratory. The effect of modification on the surface properties of bentonite was characterized. The hydrophobicity and surface electric properties of bentonite were significantly improved by attaching cetyltrimethyl ammonium bromide to its surface. The results showed that surface properties of bentonite played an important role in OMA formation. Spherical droplets of OMAs were formed with natural bentonite and elongated solid OMAs and flake OMAs were formed with modified bentonite as observed by fluorescence microscopy. The effects of shaking time, oil concentration and mineral content were also studied. It was suggested that oil concentration and mineral content were critical factors and OMA formed rapidly with both types of bentonite. Modified bentonite had better performance on OMA formation than hydrophilic natural bentonite. [ABSTRACT FROM AUTHOR]

Published
2013
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