A geographer on well-trodden ground

Integrated teaching: a less trodden path.

A Geographer Looks at Spatial Information Theory

Geographic information is defined as a subset of spatial information, specific to the spatiotemporal frame of the Earth’s surface. Thus geographic information theory inherits the results of spatial information theory, but adds results that reflect the specific properties of geographic information. I describe six general properties of geographic information, and show that in some cases specializ...

Geographer of the male genome.

An English literature student called up David C. Page a few years ago and told him she was thinking of doing a thesis that would rebut feminist criticism and bring back a measure of respectability to him and his work. “I didn’t know I was in need of rehabilitation,” Page remarks one late September afternoon in his fourth-fl oor corner offi ce at the Whitehead Institute on the Massachusetts Inst...

Effect of Well Disinfection on Arsenic in Ground Water

Domestic water wells are routinely subjected to in situ chemical disinfection treatments to control nuisance or pathogenic bacteria. Most treatments are chlorine based and presumably cause strongly oxidizing conditions in the wellbore. Water resource managers in Wisconsin were concerned that such treatments might facilitate release of arsenic from sulfide minerals disseminated within a confined...

Amb Breaks Well-Pointedness, Ground Amb Doesn't

McCarthy’s amb operator has no known denotational semantics, and its basic operational properties the context lemma, the compatibility of refinement similarity and convex bisimilarity have long been open. In this paper, we give a single example program that demonstrates the failure of each of these properties. This shows that there cannot be any well-pointed denotational semantics. However, we ...