Navigation/traffic control satellite mission study. Volume 1 - Summary

System of satellites, ground stations, and hardware of various user craft for transoceanic traffic contro

Effects of Paternal Presence and Family Stability on Child Cognitive Performance

This study uses data from the Fragile Families and Child Wellbeing Study (FFCWS) to examine the effects of a father?s presence on the cognitive performance of his pre-school aged child. Cognitive performance is measured by the Peabody Picture Vocabulary Test (PPVT), a well-known indicator of cognitive ability and academic readiness for young children. Like previous studies, the richness of the data is exploited by including numerous covariates in the OLS regression model. In addition, the study also employs a Proxy Variable-OLS Solution to dealing with the problem of omitted variable bias. Subsequently, causal inferences can be made from the empirical findings. The study finds two distinct effects of paternal presence based on whether the child belongs to a stable versus disruptive family structure. The empirical results indicate that cognitive outcomes are statistically similar for children in stable single-parent and stable two-parent family households. However, disruptive family structures, characterized by a father?s partial presence in the home, are shown to have deleterious effects on cognitive performance compared to a stable single-parent family structure where the father has never even been present. One profound implication of these findings is the importance of family stability above family structure in producing positive child outcomes. Moreover, there is suggestive evidence that the effect of disruptive paternal presence is significantly larger for girls than for boys.

j_psi Suppression and the Quark-Gluon Plasma

All measured Feynman x_f distributions of the ratio, R, of j_psi production in nuclei relative to production on protons fall off with x_f. They show [2] that absorption of charmonium cannot be the only source of j_psi suppression and that energy loss of the constituents of the incident proton prior to the j_psi production, because of the exponential sqrt(s) dependence of the charmonium cross section, should not be neglected. Including the effects of initial state energy loss we find that the latest measured Pb-Pb j_psi cross sections do not provide any evidence for deconfinement.Comment: 9 pages, 2 figures, additional material, accepted by Physics Letter

A fine balance: reconsidering patient autonomy in light of the UN Convention on the Rights of Persons with Disabilities

The Convention on the Rights of Persons with Disabilities is increasingly seen as driving a paradigm shift in mental health law, particularly in relation to the understanding that it requires a shift from substituted to supported decisions. This article identifies two competing moral commitments implied by this shift, both of which appeal to the notion of autonomy. It is argued that because of these commitments the Convention is in tension with more general calls in the medical ethics literature for preserving patient autonomy through support. The competing commitments within the Convention also present a particular challenge in putting the support it requires into practice. A discursive control account of freedom is used to develop some practical guidelines for navigating this new moral territory

Air traffic control surveillance accuracy and update rate study

The results of an air traffic control surveillance accuracy and update rate study are presented. The objective of the study was to establish quantitative relationships between the surveillance accuracies, update rates, and the communication load associated with the tactical control of aircraft for conflict resolution. The relationships are established for typical types of aircraft, phases of flight, and types of airspace. Specific cases are analyzed to determine the surveillance accuracies and update rates required to prevent two aircraft from approaching each other too closely

Thomas Hudson's 'Historie of Judith'

From the scantiness of the materials available for writing his biography Thomas Hudson seems to have belonged to that large class which makes little stir in the world while it is alive and which is promptly forgotten as soon as it is dead. So slightly did he impress himself upon his contemporaries that not one of them has a reference to the man himself, though one or two make mention of his Historie of Judith, and within two generations of his death Edward Phillips could write in his sketch of English poetry, "of Tho. Hudson, my researches have furnished me with no further account (than his name)" What more than this is now known comes entirely from official records which the progress of historical studies and research has gradually made available, and the brief account of his life that follows has been put together wholly from these sources.And while Thomas Hudson's Historie of Judith has usually been dismissed in a few contemptuous words, it is not a wholly contemptible piece of work and it gains an additional importance from the circumstances in which it was made

The relationship between P2X4 and P2X7: a physiologically important interaction?

Purinergic signaling within the kidney is becoming an important focus in the study of renal health and disease. The effectors of ATP signaling, the P2Y and P2X receptors, are expressed to varying extents in and along the nephron. There are many studies demonstrating the importance of the P2Y2 receptor on kidney function, and other P2 receptors are now emerging as participants in renal regulation. The P2X4 receptor has been linked to epithelial sodium transport in the nephron and expression levels of the P2X7 receptor are up-regulated in certain pathophysiological states. P2X7 antagonism has been shown to ameliorate rodent models of DOCA salt-induced hypertension and P2X4 null mice are hypertensive. Interestingly, polymorphisms in the genetic loci of P2X4 and P2X7 have been linked to blood pressure variation in human studies. In addition to the increasing evidence linking these two P2X receptors to renal function and health, a number of studies link the two receptors in terms of physical associations between their subunits, demonstrated both in vitro and in vivo. This review will analyze the current literature regarding interactions between P2X4 and P2X7 and assess the potential impact of these with respect to renal function

Study of factorization in QCD with polarized beams and Λ production at large pT

Abstract We discuss what aspects of the leading orders in QCD could be tested in the large pT reactions p ¯ → p → Λ → + X , p ¯ p → → Λ → + X and p ¯ → p → → Λ + X