Map Showing Locations of Patuxent and Patapsco Aquifer Wells in the Baltimore, Md., area

This digital image was produced in the Summer of 2012 by the Maryland State Archives (MSA) from the original map held by the Maryland Geological Survey (MGS). We are indebted to the staff of the MGS and MSA for helping us make this these images available.This map is Plate 1 from Chapelle, F.H., “Hydrogeology, Digital Solute-Transport Simulatio, and Geochemistry of the Lower Cretaceous Aquifer Systems near Baltimore, Maryland”. Baltimore: Maryland Geological Survey, 1985 (Report of Investigations No. 43)

Cross-section A-A' Showing Major Hydrologic Units in the Baltimore, Md., area

This digital image was produced in the Summer of 2012 by the Maryland State Archives (MSA) from the original map held by the Maryland Geological Survey (MGS). We are indebted to the staff of the MGS and MSA for helping us make this these images available.This map is Plate 2 from Chapelle, F.H., “Hydrogeology, Digital Solute-Transport Simulatio, and Geochemistry of the Lower Cretaceous Aquifer Systems near Baltimore, Maryland”. Baltimore: Maryland Geological Survey, 1985 (Report of Investigations No. 43)

An Analysis of Inference with the Universum

We study a pattern classification algorithm which has recently been proposed by Vapnik and coworkers. It builds on a new inductive principle which assumes that in addition to positive and negative data, a third class of data is available, termed the Universum. We assay the behavior of the algorithm by establishing links with Fisher discriminant analysis and oriented PCA, as well as with an SVM in a projected subspace (or, equivalently, with a data-dependent reduced kernel). We also provide experimental results