Vulnerability exploited and a population betrayed

Stabilization of an Exploited Fish Population

Abstract. The purpose of the paper is to design a fishing strategy in order to regulate an exploited fish population. To this end, we use a stagestructured model of a harvested fish population that has been derived in [5]. We give a formula for the fishing effort as a feedback control that allows to stabilize the system. travail réalisé avec la contribution financière du CNCPRST (Maroc) et du C...

The Betrayed Generation

How Feeling Betrayed Affects Cooperation

For a population of interacting self-interested agents, we study how the average cooperation level is affected by some individuals' feelings of being betrayed and guilt. We quantify these feelings as adjusted payoffs in asymmetric games, where for different emotions, the payoff matrix takes the structure of that of either a prisoner's dilemma or a snowdrift game. Then we analyze the evolution o...

Vulnerability of intensively-exploited hard-rock aquifers to fluoride contamination in India: impact of global change

A geochemical study was conducted to obtain a comprehensive understanding of fluoride concentration increase in groundwater from a crystalline (hard-rock) aquifer in a small Indian agricultural watershed, where groundwater is intensively abstracted for paddy irrigation. A reactive1-D geochemical model using PHREEQC was used to reproduce fluoride concentrations under rice paddies taking into acc...

Betrayed Mood in Public View: Taking a MySpace History

Social networking sites (SNS), the modern mainstay of adolescent expression, may provide vital information to physicians. The emergency department (ED) is a setting where SNS may be helpful. A reticent 19-year-old in the ED prompted a search for pertinent information on the Internet, where a profile on www.myspace.com relayed a troubled post. The patient was admitted for psychiatric evaluation ...