more able workforce, and variance in output across individuals at the firm will rise when it shifts to piece rates. In Safelite, productivity effects amount to a 44-percent increase in output per worker. This firm apparently had selected a suboptimal compensation system, as profits also increased

-power'' used to date have measured the ability of fied form. There is no apparent interaction between plasma to withstand the oxidative effects of reactive antioxidants. Measured stoichiometric factors of Tro-species purposefully generated in the reaction mixture.

in the corporate bond market is driven by local supply/demand shocks that are independent of both changes in credit-risk and typical measures of liquidity. We note that a similar, but significantly smaller effect has been documented in the mortgage backed (Ginnie Mae) securities market by Boudoukh, Richardson

This paper describes a new NMR imaging modality-MR diffusion tensor imaging. It consists of estimating an effective diffusion tensor, Deff, within a voxel, and then displaying useful quantities derived from it. We show how the phenomenon of anisotropic diffusion of water (or metabolites

Alignment quality may have as much impact on phylogenetic reconstruction as the phylogenetic methods used. Not only the alignment algorithm, but also the method used to deal with the most problematic alignment regions, may have a critical effect on the final tree. Although some authors remove

ABSTRACT The apparent effect of cloud seeding on the average 24-hr precipitation in the Santa Catalina Moun tains during the two programs of the 7-year-long Arizona experiment was found to be a 30% loss of rain (P = 0.06). Considering rainy days only, the apparent effect is a 34% loss of rain (P

Research on people’s confidence in their general knowledge has to date produced two fairly stable effects, many inconsistent results, and no comprehensive theory. We propose such a comprehensive framework, the theory of probabilistic mental models (PMM theory). The theory (a) explains both

of household heads to examine differences in the unemployment spell distributions of UI recipients and nonrecipients. Sharp increases in the rate of escape from unemployment both through recalls and new job acceptances are apparent for UI recipients around the time when benefits are likely to lapse

is becoming apparent. Central to the design and effective operation of such multiagent systems (MASs) are a core set of issues and research questions that have been studied over the years by the distributed AI community. In this article, I present some of the critical notions in MASs and the research work

Stomach contents of three species of tuna, (Thunnus obesus, T albacares, T alalunga) commonly taken by longline, were studied during scientific cruises in Polynesia, South Pacific. An empirical method was devised for reconstructing the individual weight of prey prior to digestion. It permitted the estimation of the initial weight of stomach content. Observed values, related to the individual weight of each tuna, appeared low and suggest that the vast majority of tuna caught by longline had empty or almost empty stomachs. A comparison with observations of tuna caught by the most active gears, such as purse seine or gillnet suggest that only tunas with a low rate of stomach repletion are taken by longline. This suggestion leads to the hypothesis that the catch rate of longline fishing depends not only on tuna density, but also on the relative joint densities of prey and tuna, particularly in biologically heterogeneous environments. The consequences of such a hypothesis on the value of longline CPUE for indexing abundance of deep swimming tuna could be important.