Rare and common The hot grains of tektite and obsidian that show up in HD 172555’s IR spectrum are small enough that the star’s radiation pressure would drive them away from their current 6-AU orbit within 0.1 million years. The SiO molecules would likely condense and reform minerals on the same time scale. Given that rocky planets take 100 My to form, catching a giant impact in HD172555, despi...

We consider the problem of reducing the control cost associated with handling connections (or ows) in multimedia networks such as ATM or an Internet supporting RSVP. This cost lies in processing and storage; it is directly related to connection setup latency and to the maximum number of connections that a switching node can handle. We advocate a systematic grouping of connections inside the tra...

Questions and answers about incapacitation abound in all discussions about criminal justice policy. They are among the most pressing of all research issues, yet estimates about the incapacitation effect on crime vary considerably, and most are based on very old and incomplete estimates of the longitudinal pattern of criminal careers. This paper provides an overview of the incapacitation issue, ...

Christian Seiler, Pascal Meier, and their co-workers of the University Hospital in Bern, Switzerland, well known for their pioneering clinical work on the collateral circulation of the heart, have described a meta-analysis of 12 studies involving 6529 patients of the role played by the collateral circulation in mortality. The authors come to the conclusion that the ‘coronary collateralization h...

A parallel variant of breadth-rst search for distributed computing is presented. The variant allows exhaustive enumeration of elements of a search space (implicitly deened graph) in which the representation of all graph nodes would otherwise require more than the total available memory. This algorithm requires the use of a tadpole data structure to partition the search space into connected subg...

The Personal Responsibility and Work Opportunity Reconciliation Act of 1996 made fundamental changes in the federal system of public assistance in the United States, and specifically limited the eligibility of immigrant households to receive many types of aid. Many states chose to protect their immigrant populations from the presumed adverse effects of welfare reform by offering state-funded as...

F rictional drag steals energy from a moving fluid, but the loss usually becomes greater as the flow goes from smooth, or “laminar,” to turbulent. The onset of turbulence therefore poses a problem for many situations involving fluid flow through a conduit, be it oil in a giant pipeline, blood in a human aorta, or liquid in a heat exchanger. One established solution is to add a small amount of p...

For centuries, people have used alcohol to relieve stress--that is, the interpretation of an event as signaling harm, loss, or threat. The organism usually responds to stress with a variety of behavioral, biological, and cognitive changes. Alcohol consumption can result in a stress-response dampening (SRD) effect, which can be assessed using various measures. Numerous individual differences and...

The reduction in polypharmacy and avoidance of inappropriate medications is a common goal in the care of older persons, regardless of setting. While multidisciplinary teams and regular medication reconciliation and review can identify and reduce medication-related problems, tools to decrease the use of high-risk/low benefit medications can help the individual clinician to improve prescribing. N...