One way to characterize students' representations is to distinguish between concrete, semi-concrete, semi-abstract and abstract representations. In a previous study with 6-year olds we surprisingly found that – while solving a combinatorial task the children who used semi-concrete representations in their documentations were more systematic in the process of finding solutions with less duplicat...

Previous research has shown that performing joint actions can lead to the representation of both one's own and others' actions. In the present study we explored the influence of co-representation on response stopping. Are joint actions more difficult to stop than solo actions? Using a variation of the stop-signal task, we found that participants needed more time to stop a planned joint action c...

So-called excess growth in Medicare spending per beneficiary has varied widely and has slowed in recent years. The annual rate of excess growth fell from 5.6 percent during 1975-1983, to 2.1 percent during 1983-1997, to only 0.5 percent during 1997-2005. Changes in payment policies and regulations can help explain the observed slowdown. These include new prospective payment systems for hospital...

Abrtmcr-An important question in the study of aging concerns the rate at which people physically deteriorate with age. HOW much, for example. CB~ be physically expected of, say, a healthy, non-injured 75.year-old man or woman relative to what be or she could do at ape 4% This paper applies econometric techniques to data on men’s track and field and road racing remrds by age to estimate the rate...

We compute the wall velocity in the MSSM. We therefore generalize the SM equations of motion for bubble walls moving through a hot plasma at the electroweak phase transition and calculate the friction terms which describe the viscosity of the plasma. We give the general expressions and apply them to a simple model where stops, tops and W bosons contribute to the friction. In a wide range of par...

If you live in Barrington, you’ve seen the bright blue cars driving around town with driver’s ed teachers and their students. Those cars with the extra brake on the front passenger side belong to Joyce’s Driving School, located at 120 lageschulte Street near the high school. owned by Joyce younger, the school and its philosophy was inspired after younger observed her daughter’s driver’s ed expe...

Many enterprise environments have databases running on network-attached server-storage infrastructure (referred to as Storage Area Networks or SANs). Both the database and the SAN are complex systems that need their own separate administrative teams. This paper puts forth the vision of an innovative management framework to simplify administrative tasks that require an in-depth understanding of ...

The speed of the bacterial flagellar motor is thought to be regulated by structural changes in the motor. Two new studies, Boehm et al. (2010) in this issue and Paul et al. (2010) in Molecular Cell, now show that cyclic di-GMP also regulates flagellar motor speed through interactions between the cyclic di-GMP binding protein YcgR and the motor proteins.

This paper presents a model of influence where agents’ beliefs are based on an objective reality, such as the properties of an environment. The perception of the objective reality is not direct: all agents know is that the more correct a belief, the more successful the actions that are deduced from this belief. A pair of agents can influence eachother when they perform joint action. They are no...