Remanent magnetization of the Permian Cutler formation of western Colorado

Remanent magnetization of Permian Cutler formation of western Colorad

Evidence for an ancient lunar magnetic field. Investigation of the maximum magnetic field ever present on the moon Final report

Lunar paleomagnetic field evidence from Apollo 12 rock studie

Paleomagnetic evidence for the rotation of Alaska

Paleomagnetic evidence for rotation of Alaska relative to North Americ

Social Networks and Interactions in Cities

We examine how interaction choices depend on the interplay of social and physical distance, and show that agents who are more central in the social network, or are located closer to the geographic center of interaction, choose higher levels of interactions in equilibrium. As a result, the level of interactivity in the economy as a whole will rise with the density of links in the social network and with the degree to which agents are clustered in physical space. When agents can choose geographic locations, there is a tendency for those who are more central in the social network to locate closer to the interaction center, leading to a form of endogenous geographic separation based on social distance. Finally, we show that the market equilibrium is not optimal because of social externalities. We determine the value of the subsidy to interactions that could support the first-best allocation as an equilibrium and show that interaction effort and the incentives for clustering are higher under the subsidy program.Social networks; urban-land use; Bonacich centrality

Social Networks and Interactions in Cities

We examine how interaction choices depend on the interplay of social and physical distance, and show that agents who are more central in the social network, or are located closer to the geographic center of interaction, choose higher levels of interactions in equilibrium. As a result, the level of interactivity in the economy as a whole will rise with the density of links in the social network and with the degree to which agents are clustered in physical space. When agents can choose geographic locations, there is a tendency for those who are more central in the social network to locate closer to the interaction center, leading to a form of endogenous geographic separation based on social distance. Finally, we show that the market equilibrium is not optimal because of social externalities. We determine the value of the subsidy to interactions that could support the first-best allocation as an equilibrium and show that interaction effort and the incentives for clustering are higher under the subsidy program.social networks, urban-land use, Bonacich centrality

Sprawl and Blight

The objective of this paper is to show how the same market failures that contribute to urban sprawl also contribute to urban blight. The paper develops a simple dynamic model in which new suburban and older central-city properties compete for mobile residents. The level of housing services generated by older properties depends on current maintenance or reinvest-ment expenditures. In this setting, market failures that reduce the cost of occupying suburban locations, thus leading to excessive suburban development, also depress central-city housing prices and undermine maintenance incentives, leading to deficient levels of central-city rein-vestment. Corrective policies that shift population from the suburbs to the center result in higher levels of reinvestment in central-city housing, therefore reducing blight.urban sprawl, blight, market failures

I Forgot To Remember To Forget

Memory is a nonlinear narrative: pieces of a story that are parceled away in various places in your mind, that come together to tell another larger story. These parcels are made up of moments and events that when combined create a new story and offer new direction. Our original memory can become distorted by perspective. What influences your recollec- tions? Maybe a photograph has influenced how you remember something; maybe you have intentionally or unintentionally altered a story so many times that you now believe the altered version to be a factual account. When we remember a moment or event we remember it in an instant; we do not relive this experience as it happened in real time, it is relived in a fleeting moment. It is the stories told and the memories captured in these fleeting moments that I explore in my work

Sprawl and Blight

The objective of this paper is to show how the same market failures that contribute to urban sprawl also contribute to urban blight. The paper develops a simple dynamic model in which new suburban and older central-city properties compete for mobile residents. The level of housing services generated by older properties depends on current maintenance or reinvestment expenditures. In this setting, market failures that reduce the cost of occupying suburban locations, thus leading to excessive suburban development, also depress central-city housing prices and undermine maintenance incentives, leading to deficient levels of central-city reinvestment. Corrective policies that shift population from the suburbs to the center result in higher levels of reinvestment in central-city housing, therefore reducing blight.Urban sprawl; Urban blight; Market failures

The Economics of an HIF SPRFD Fusion System in a Desert Region

The economics of the FPC SPRFD fusion power system have been discussed previously by Helsley and Burke (2014) in a general model that was based on marketing of electricity and the production of synthetic fuel from the excess generating capacity..