Learn More
—Wireless Sensor Networks (WSNs) are generally designed to support applications in long-term deployments, and thus WSN protocols are primarily designed to be energy efficient. However, the research community has recently explored new WSN applications such as industrial process automation. These mission-critical applications demand not only energy efficient(More)
It is widely accepted, based on data from the last few decades and on model simulations, that anthropogenic climate change will cause increased fire activity. However, less attention has been paid to the relationship between abrupt climate changes and heightened fire activity in the paleorecord. We use 35 charcoal and pollen records to assess how fire(More)
We analyse the implications of optimal taxation for the stochastic behaviour of debt. We show that when a government pursues an optimal fiscal policy under complete markets, the value of debt has the same or less persistence than other variables in the economy and it declines in response to shocks that cause the deficit to increase. By contrast, under(More)
By comparing Silurian through end Permian [approximately 250 million years (Myr)] charcoal abundance with contemporaneous macroecological changes in vegetation and climate we aim to demonstrate that long-term variations in fire occurrence and fire system diversification are related to fluctuations in Late Paleozoic atmospheric oxygen concentration.(More)
Theoretical models of growth and trade suggest that patterns of international specialisation are inherently dynamic and evolve endoge-nously over time. Initial comparative advantages are either reinforced or gradually unwound with the passage of time. This paper puts forward an empirical framework to evaluate the dynamics of international trade patterns,(More)
Fire is a worldwide phenomenon that appears in the geological record soon after the appearance of terrestrial plants. Fire influences global ecosystem patterns and processes, including vegetation distribution and structure, the carbon cycle, and climate. Although humans and fire have always coexisted, our capacity to manage fire remains imperfect and may(More)
We investigate theoretically and empirically the competitive effects of increased trade on prices, productivity and markups. Using disaggregated data for EU manufacturing over the period 1988-2000 we Þnd increased openness exerts a negative and signiÞcant impact on sectoral prices. Increased openness lowers prices by both reducing markups and raising(More)
for useful discussions. We are also grateful for comments from Abstract Our objective is to identify the trading strategy that would allow an investor to take advantage of " excessive " stock price volatility and " sentiment " fluctuations. We construct a general-equilibrium model of sentiment. In it, there are two classes of agents and stock prices are(More)
We suggest that the spread of angiosperms in the Cretaceous was facilitated by novel fire regimes. Angiosperms were capable of high productivity and therefore accumulated flammable biomass ('fuel') more rapidly than their predecessors. They were capable of rapid reproduction, allowing populations to spread despite frequent disturbance. We evaluate the(More)
It is rapidly becoming clear that entertainment will be one of the killer applications of future wireless networks. More specifically mobile gaming is predicted to be worth $1.2 billion by the year 2006 to providers in the U.S. alone [20]. The driving force behind this is the introduction of powerful feature rich handsets and ubiquitous access to high(More)