Determinants of Drug Injection Behavior: Economic Factors, HIV Injection Risk and Needle Exchange Programs

This study examines the effects of local cocaine and heroin prices, AIDS rates, and needle exchange programs on drug injection and needle sharing by adult male arrestees in 24 large U.S. cities during 1989 1995. Regressions that control for personal characteristics including income, fixed city and year effects, and city-specific trends indicate that needle exchange programs decrease both injection and sharing. Increases in previous year AIDS prevalence reduce injection by both sharers and non-sharers, leaving the proportion of injectors who share unchanged. Higher cocaine prices lead to less cocaine injection and more sharing, but heroin prices do not effect injection or sharing.

Fraternity Membership and Binge Drinking

This paper examines the relationship between membership in social fraternities and sororities and binge drinking among 18–24 year old full-time four-year college students who participated in the 1995 National College Health Risk Behavior Survey. To deal with unobserved heterogeneity in binge drinking incidence and frequency regressions, I enter as explanatory variables various measures of situational and overall alcohol use. When these are added, the fraternity membership coefficient is substantially reduced in size, but remains large and highly significant. This suggests that fraternity membership increases binge drinking. If not, it identifies a very specific mechanism underlying the decision to join a fraternity: members drink more intensely than non-members even while doing so in similar frequencies and situations and for similar lengths of time. Particularly notable is that behavior by underage students appears to drive the relationship.

High School Alcohol Use and Young Adult Labor Market Outcomes

We estimate the relationship between 10th grade binge drinking in 1990 and labor market outcomes in 2000 among National Educational Longitudinal Survey respondents. For females, adolescent drinking and adult wages are unrelated, and negative employment effects disappear once academic achievement is held constant. For males, negative employment effects and, more strikingly, positive wage effects persist after controlling for achievement as well as background characteristics, educational attainment, and adult binge drinking and family and job characteristics. Accounting for illegal drug use and other problem behaviors in 10th grade eliminates the unemployment effect, but strengthens the wage effect. As the latter is not explicable by the health, income or social capital justifications that are often used for frequently observed positive correlations between adult alcohol use and earnings, we conjecture that binge drinking conveys unobserved social skills that are rewarded by employers.

The Effect of Child Access Prevention Laws on Non-Fatal Gun Injuries

Many states have passed child access prevention (CAP) laws, which hold the gun owner responsible if a child gains access to a gun that is not securely stored. Previous CAP law research has focused exclusively on gun-related deaths even though most gun injuries are not fatal. We use annual hospital discharge data from 1988-2001 to investigate whether CAP laws decrease non-fatal gun injuries. Results from Poisson regressions that control for various hospital, county and state characteristics, including state-specific fixed effects and time trends, indicate that CAP laws substantially reduce non-fatal gun injuries among both children and adults. Our interpretation of the estimates as causal impacts is supported by the absence of effects on self-inflicted gun injuries among adults, non-gun self-inflicted injuries, and knife assaults, the failure of violent crime levels and law leads to attain significance or alter estimated law coefficients, and larger coefficient magnitudes in states where the law covers older children.

Dorr Rebellion Project Selected Bibliography

An annotated and traditional bibliography of research materials utilized by Dr. Erik J. Chaput and Rhode Island scholar Russell J. DeSimone in creating the script for The Dorr Rebellion short-form documentary and other resources on the Dorr Rebellion Project website. For those resources which are open access, an access link has been provided within the document. Visit the Dorr Rebellion Project website for more information: http://library.providence.edu/dorr

The Road Not Taken: John Brown Francis and the Dorr Rebellion

In this contextualizing essay, Dr. Erik J. Chaput and Russell DeSimone examine historical opposing views to Providence attorney Thomas Wilson Dorr and his attempt to reform the state\u27s archaic governing structure in the spring of 1842. Chief among these views is that of former Governor John Brown Francis, who urged both sides to find a compromise with each other. The essay, along with a collection of letters it accompanies on our Dorr Rebellion Letters project site, elucidates how the moderate faction within the Law and Order party; had this moderate voice been heeded Rhode Island’s Dorr Rebellion would have turned out quite differently and that there were alternative approaches that politicians might have taken. The Dorr Rebellion Project http://library.providence.edu/dorr The Dorr Letters Project http://library.providence.edu:8080/xtf/index.htm

On the genesis of directional friction through bristle-like mediating elements

We propose an explanation of the genesis of directional dry friction, as emergent property of the oscillations produced in a bristle-like mediating element by the interaction with microscale fluctuations on the surface. Mathematically, we extend a convergence result by Mielke, for Prandtl-Tomlinson-like systems, considering also non-homothetic scalings of a wiggly potential. This allows us to apply the result to some simple mechanical models, that exemplify the interaction of a bristle with a surface having small fluctuations. We find that the resulting friction is the product of two factors: a geometric one, depending on the bristle angle and on the fluctuation profile, and a energetic one, proportional to the normal force exchanged between the bristle-like element and the surface. Finally, we apply our result to discuss the with the nap/against the nap asymmetry

Purcell magneto-elastic swimmer controlled by an external magnetic field

International audienceThis paper focuses on the mechanism of propulsion of a Purcell swimmer whose segments are magnetized and react to an external magnetic field applied into the fluid. By an asymptotic analysis, we prove that it is possible to steer the swimmer along a chosen direction when the control functions are prescribed as an oscillating field. Moreover, we discuss what are the main obstructions to overcome in order to get classical controllability result for this system

SOCAP: Lessons learned in applying SIPE-2 to the military operations crisis action planning domain

This report describes work funded under the DARPA Planning and Scheduling Initiative that led to the development of SOCAP (System for Operations Crisis Action Planning). In particular, it describes lessons learned in applying SIPE-2, the underlying AI planning technology within SOCAP, to the domain of military operations deliberate and crisis action planning. SOCAP was demonstrated at the U.S. Central Command and at the Pentagon in early 1992. A more detailed report about the lessons learned is currently being prepared. This report was presented during one of the panel discussions on 'The Relevance of Scheduling to AI Planning Systems.