Reconclining phi radiative decays with other data for a0(980), fo(980), pi-pi -> KK and pi-pi -> eta-eta

Data for phi -> gamma (eta-pizero) are analysed using the KK loop model and compared with parameters of a0(980) derived from Crystal Barrel data. The eta-pi mass spectrum agrees closely and the absolute normalisation lies just within errors. However, BES parameters for fo(980) predict a normalisation for phi -> gamma (pizero-pizero) at least a factor 2 lower than is observed. This discrepancy may be eliminated by including constructive interference between fo(980) and sigma. The magnitude required for sigma -> KK is consistent with data on pi-pi -> KK. A dispersion relation analysis by Buttiker, Descotes-Genon and Moussallam of pi-pi -> KK leads to a similar conclusion. Data on pi-pi -> eta-eta also require decays of sigma to eta-eta. Four sets of pi-pi -> KK data all require a small but definite fo(1370) signal.Comment: 21 pages, 11 figures, Small rearrangement of reference

Mixed mode education: implications for library user services

The Faculty of Information Technology at QUT does not formally carry out distance education for any of its courses. However, it has pursued a number of initiatives that have made it possible for students to carry out an increasing proportion of their coursework off-site. These initiatives include computer-managed learning, World Wide Web and CDROM delivery of administrative and educational materials, and most recently the development of an integrated learning environment (ILE) for electronic delivery. These developments have been complemented and supported by the QUT Library by means of different avenues of access to CDROMs, a regional electronic document delivery service (REDD), and an electronic reserve (E-Reserve) service. Issues associated with the operation and evaluation of such facilities are described, and future library role in educational delivery are discussed

Near-threshold production of omega mesons in the pn -> d omega reaction

The first measurement of the p n -> d omega total cross section has been achieved at mean excess energies of Q = 28 and 57 MeV by using a deuterium cluster-jet target. The momentum of the fast deuteron was measured in the ANKE spectrometer at COSY-Juelich and that of the slow "spectator" proton p(sp) from the p d -> p(sp) d omega reaction in a silicon telescope placed close to the target. The cross sections lie above those measured for p p -> p p omega but seem to be below theoretical predictions.Comment: 7 pages, 8 figures; second approach to describe the background has been added; results changed insignificantly, EPJ in pres

Getting Time Off: Access to Leave Among Working Parents

"Mommy, I don't feel good." "Honey, it's time to go to the hospital." When working parents, or parents-to-be, hear these phrases, their anxiety levels often increase. Not only because their children are sick or their partners are in labor, but also because they will have to find a way to keep their jobs while tending to their families' needs. Maternity and paternity leave, along with vacation, sick leave, and personal leave, help workers balance their responsibilities at home and at the office. This brief uses new data from the National Survey of America's Families (NSAF) to portray which working parents have access to paid and maternity/paternity leave.Although federal law guarantees job-protected, unpaid family leave to many workers, only three in five American workers are eligible to take this leave (Cantor et al. 2001). Moreover, no state or federal legislation requires employers to provide paid leave of any kind. Because access to leave is not universal, some caregivers do not fully realize the benefits of job-protected leave, namely job security and some flexibility to care for children.This analysis examines whether access to leave differs by socioeconomic characteristics. The data suggest that the majority of working parents can take maternity or paternity leave from their jobs. Although access to maternity/paternity leave varies with measures of economic well-being, it is much more equal than access to paid leave. Most poor workers, working welfare recipients, and working recent welfare leavers cannot take paid leave from their jobs. And those who can take paid leave typically have fewer days of paid leave than nonpoor workers or workers with no recent welfare experience. The relatively even distribution of access to maternity and paternity leave, compared with the uneven access to paid leave, could be an effect of the Family and Medical Leave Act of 1993 (FMLA)

Pension Reform: The Pension Preservation and Savings Expansion Act of 2003

CRS ReportPensionreform_may282003.pdf: 462 downloads, before Oct. 1, 2020

Localization properties of a tight-binding electronic model on the Apollonian network

An investigation on the properties of electronic states of a tight-binding Hamiltonian on the Apollonian network is presented. This structure, which is defined based on the Apollonian packing problem, has been explored both as a complex network, and as a substrate, on the top of which physical models can defined. The Schrodinger equation of the model, which includes only nearest neighbor interactions, is written in a matrix formulation. In the uniform case, the resulting Hamiltonian is proportional to the adjacency matrix of the Apollonian network. The characterization of the electronic eigenstates is based on the properties of the spectrum, which is characterized by a very large degeneracy. The $2\pi /3$ rotation symmetry of the network and large number of equivalent sites are reflected in all eigenstates, which are classified according to their parity. Extended and localized states are identified by evaluating the participation rate. Results for other two non-uniform models on the Apollonian network are also presented. In one case, interaction is considered to be dependent of the node degree, while in the other one, random on-site energies are considered.Comment: 7pages, 7 figure

Designing in the Street: Innovation In-Situ

This paper suggests that taking the design process into the field and constantly engaging with the site to observe, intervene, brainstorm, prototype and create fosters unique forms of inspiration and innovation. How does a consideration of participation of both the designer and the user in the space change the design process? With participation comes understanding of the situation and by elaborating on possible futures with users, designers can find lucid innovations. We describe a project conducted by students from the Interaction Design course at the Royal College of Art in London which used a variety of approaches to speculate on the social and technological future of a London street. We discuss and compare the role of different techniques which enable designers to find inspiration for innovative technology in the field, or in this case the street. Keywords: Design, Prototyping, Ethno-Fiction</p

The kilohertz quasi-periodic oscillations during the Z and atoll phases of the unique transient XTE J1701--462

We analysed 866 observations of the neutron-star low-mass X-ray binary XTE J1701-462 during its 2006-2007 outburst. XTE J1701-462 is the only example so far of a source that during an outburst showed, beyond any doubt, spectral and timing characteristics both of the Z and atoll type. We found that the lower kHz QPO in the atoll phase has a significantly higher coherence and fractional rms amplitude than any of the kHz QPOs seen during the Z phase, and that in the same frequency range, atoll lower kHz QPOs show coherence and fractional rms amplitude, respectively, 2 and 3 times larger than the Z kHz QPOs. Out of the 707 observations in the Z phase, there is no single observation in which the kHz QPOs have a coherence or rms amplitude similar to those seen when XTE J1701-462 was in the atoll phase, even though the total exposure time was about 5 times longer in the Z than in the atoll phase. Since it is observed in the same source, the difference in QPO coherence and rms amplitude between the Z and atoll phase cannot be due to neutron-star mass, magnetic field, spin, inclination of the accretion disk, etc. If the QPO frequency is a function of the radius in the accretion disk in which it is produced, our results suggest that in XTE J1701-462 the coherence and rms amplitude are not uniquely related to this radius. Here we argue that this difference is instead due to a change in the properties of the accretion flow around the neutron star. Regardless of the precise mechanism, our result shows that effects other than the geometry of space time around the neutron star have a strong influence on the coherence and rms amplitude of the kHz QPOs, and therefore the coherence and rms amplitude of the kHz QPOs cannot be simply used to deduce the existence of the innermost stable circular orbit around a neutron star.Comment: 11 pages, 5 figures, 2 tables, submitted to MNRA