The Hellings-Down (HD) function describes gravitational-wave (GW) induced correlations in pulse arrival times from pulsar populations. author presents a thorough analytical treatment of the HD variance, demonstrating how cosmological vs. effects can be separated, and variance measurements provide unique insight on GW sources themselves.

We take as our starting point the insights of Downs (1957) into twoparty competition. A careful reading of Downs offers a much more sophisticated and nuanced portrait of the factors affecting party differentiation than the simplistic notion that, in plurality elections, we ought to expect party convergence to the views of the median voter. Later scholars have built on Downsian ideas to see what...

Chromosomal aneuploidy is the most frequent genetic damage observed in newborn children and originates as a rule from nondisjunction during maternal or paternal germ cell development. The error of chromosome segregation could be allocated in the past--at least in cases of 47,XXY--to maternal meiosis I (50%) or meiosis II (10%) and to paternal meiosis I (40%). Recent cytological improvements wit...

w Myocardial perfusion imaging (MPI) in acute myocardial infarction (MI) has had its ups and downs over the past 4 decades (1). “Cold-spot” imaging with thallium-201, technetium-99m tetrofosmin and sestamibi, wall motion assessment with gated radionuclide angiography, and “hot-spot” imaging with radionuclide-bound pyrophosphate, glucarate, antimyosin, annexin V (2), and more recently, duramycin...

The project studied videotaped unstructured play sessions between 16 Downs Syndrome (DS) infants (aged 6 months and 12 months) and their mothers, to investigate the relationship between maternal attention-directing strategies and the infants' response to toys. A comparison group consisted of 16 high-risk premature infants matched by mental and motor age. At 6 months, the DS infants spent more t...

Most people with Downs Syndrome (DS) experience low integration with society. Recent research and new opportunities for their integration in mainstream education and work provided numerous cases where levels of achievement exceeded the (limiting) expectations. This paper describes a project, POSEIDON, aiming at developing a technological infrastructure which can foster a growing number of servi...

Professor John Zaller has developed "A Theory of Media Politics" that posits a system of political campaigns in which voters, presidential candidates and the media are dependent on one another (Zaller, 1998). This theory is a direct descendant of An Economic Theory of Democracy, (Downs, 1957) which portrays voters and candidates as rational actors. Zaller's theory expands Downs' model to includ...