Measurements of fallout radioactivity in Greenland in 1977 are reported. Strontium-90 (and Cesium-137 in most cases) was determined in samples of precipitation, sea water, vegetation, animals, and drinking water. Estimates are given of the mean contents of 90Sr and 137Cs in the human diet in Greenland in 1977.

In a Perspective, Collins Iwuji and Marie-Louise Newell discuss early findings from Richard Hayes and colleagues' PopART study on HIV testing and treatment.

We present a systematic study of Plurality elections with strategic voters who,in addition to having preferences over election winners, have secondary prefer-ences, which govern their behavior when their vote cannot affect the election out-come. Specifically, we study two models that have been recently considered in theliterature [6, 17]: lazy voters, who prefer to abstain when ...

The workload of an active DBMS consists of two types of activities: externally generated tasks submitted by users, and rule management tasks caused by the triggering of rules stored in the knowledge component of the system. Most design proposals for active DBMS’s assume that an external task should be combined with all the resulting rule management tasks into a single transaction. There is no c...

[reaction: see text]. Yttrium-salen complexes effect transacylation between enolesters and chiral secondary alcohols, resulting in varying degrees of kinetic resolution. Even though the enantioselectivity remains modest (k(fast)/k(slow) up to 4.81), these results represent the first demonstration of a conceptually new metal-catalyzed acyl transfer process that results in kinetic resolution. On ...

Belief function theory provides a flexible way to combine information provided by different sources. This combination is usually followed by a decision making which can be handled by a range of decision rules. Some rules help to choose the most likely hypothesis. Others allow that a decision is made on a set of hypotheses. In [6], we proposed a decision rule based on a distance measure. First, ...

vt(mt;χt) = u(χt(mt)) + β Et[vt+1((mt −χt(mt))R+ yt+1)] (1) vt(mt;χt) = u(χt(mt)) + δβ Et[vt+1((mt −χt(mt))R+ yt+1)] (2) Notice that these functions are well defined for any consumption function χt(mt) that is feasible; they are not Bellman equations because they do not assume that the consumption function χt is optimal. For example, these functions would be well defined for χt(mt) = mt, or for...

Can we tailor fit the training to enhance judgment accuracy by changing to the learning format that invites the most effective cognitive process for the task environment at hand? The results from a study on multiple-cue judgments revealed that observing the cues and the criterion of exemplars simultaneously with no feedback involved in the training, a learning format predicted to invite exempla...