Evaluation of the Implementation of Hot Pour Sealants and Equipment for Crack Sealing in Indiana

This study was initiated as an implementation effort that would monitor, assist with and report on a new maintenance activity involving the trial use of hot pour crack sealant. Work associated with this new activity was qualitatively assessed over a period of several years. INDOT began by purchasing six oil-jacketed melters that were distributed to various sub-districts. Previous INDOT research indicated using hot pour sealant might save on labor expense because it lasted significantly longer than the current emulsion. Random observations were made of various sub-district crews using hot pour sealant and the results were reported to appropriate personnel. Inspections were made on field operations and equipment performance. The study resulted in the preparation of a written work activity, development of general guidelines for sealing, creation of a training video, the exchange of information and reporting of findings. As a result of this study and other efforts INDOT has purchased several more melters with improved features. The total volume of hot pour sealing being conducted is relatively small compared to emulsion sealing. Currently INDOT spends over two million dollars on crack sealing efforts. This study has prompted the need to conduct research that will examine the cost effectiveness of crack sealing

On The Orbital Evolution of Jupiter Mass Protoplanet Embedded in A Self-Gravity Disk

We performed a series of hydro-dynamic simulations to investigate the orbital migration of a Jovian planet embedded in a proto-stellar disk. In order to take into account of the effect of the disk's self gravity, we developed and adopted an \textbf{Antares} code which is based on a 2-D Godunov scheme to obtain the exact Reimann solution for isothermal or polytropic gas, with non-reflecting boundary conditions. Our simulations indicate that in the study of the runaway (type III) migration, it is important to carry out a fully self consistent treatment of the gravitational interaction between the disk and the embedded planet. Through a series of convergence tests, we show that adequate numerical resolution, especially within the planet's Roche lobe, critically determines the outcome of the simulations. We consider a variety of initial conditions and show that isolated, non eccentric protoplanet planets do not undergo type III migration. We attribute the difference between our and previous simulations to the contribution of a self consistent representation of the disk's self gravity. Nevertheless, type III migration cannot be completely suppressed and its onset requires finite amplitude perturbations such as that induced by planet-planet interaction. We determine the radial extent of type III migration as a function of the disk's self gravity.Comment: 19 pages, 13 figure

Prevalence of traumatic brain injury amongst children admitted to hospital in one health district : a population-based study

There is a dearth of information regarding the prevalence of brain injury, serious enough to require hospital admission, amongst children in the United Kingdom. In North Staffordshire a register of all children admitted with traumatic brain injury (TBI) has been maintained since 1992 presenting an opportunity to investigate the incidence of TBI within the region in terms of age, cause of injury, injury severity and social deprivation. The register contains details of 1553 children with TBI, two thirds of whom are male. This population-based study shows that TBI is most prevalent amongst children from families living in more deprived areas, however, social deprivation was not related to the cause of injury. Each year, 280 per 100,000 children are admitted for ≥24 hours with a TBI, of these 232 will have a mild brain injury, 25 moderate, 17 severe, and 2 will die. The incidence of moderate and severe injuries is higher than previous estimates. Children under 2 years old account for 18.5% of all TBIs, usually due to falls, being dropped or non-accidental injuries. Falls account for 60% of TBIs in the under 5s. In the 10-15 age group road traffic accidents were the most common cause (185, 36.7%). These findings will help to plan health services and target accident prevention initiatives more accurately

Scalar--Flat Lorentzian Einstein--Weyl Spaces

We find all three-dimensional Einstein--Weyl spaces with the vanishing scalar curvatureComment: 4 page

A Survey for Outer Satellites of Mars: Limits to Completeness

We surveyed the Hill sphere of Mars for irregular satellites. Our search covered nearly the entire Hill Sphere, but scattered light from Mars excluded the inner few arcminutes where the satellites Phobos and Deimos reside. No new satellites were found to an apparent limiting red magnitude of 23.5, which corresponds to radii of about 0.09 km using an albedo of 0.07.Comment: 5 figures (1 color), 2 Tables, to appear in AJ Nov. 200

Food insecurity in South Australian single parents: an assessment of the livelihoods framework approach

Single parent households experience periods of food insecurity more frequently than other Australian families. Despite elevated risk, many single parents achieve food security with limited means. This article applies and evaluates the utility of the livelihoods framework approach as a tool for understanding food insecurity in this population and generating relevant policy recommendations. The approach is adapted here to provide insight into the skills, strategies and resource individuals use to attain or strive for food security. The framework incorporates these individual capabilities into a model of the social, economic and political structures and processes through which individuals navigate to attain food security. Semi-structured interviews were conducted with single parents living in rural and urban South Australia. Transcripts were analysed in an effort to populate a food security livelihoods framework for single parents. The livelihoods framework is found to be capable of reproducing the types and levels of capabilities reported in previous findings. Furthermore, it provides novel insight into the relationships that form between classes of capabilities and between capabilities and the structures and processes in which they are utilised. These insights are considered in terms of relevance to policy

Extranuclear X-ray Emission in the Edge-on Seyfert Galaxy NGC 2992

We found several extranuclear (r >~ 3") X-ray nebulae within 40" (6.3 kpc at 32.5 Mpc) of the nucleus of the Seyfert galaxy NGC 2992. The net X-ray luminosity from the extranuclear sources is ~2-3 E39 erg/s (0.3-8.0 keV). The X-ray core itself (r <~ 1") is positioned at 9:45:41.95 -14:19:34.8 (J2000) and has a remarkably simple power-law spectrum with photon index Gamma=1.86 and Nh=7E21 /cm2. The near-nuclear (3" <~ r <~ 18") Chandra spectrum is best modelled by three components: (1) a direct AGN component with Gamma fixed at 1.86, (2) cold Compton reflection of the AGN component, and (3) a 0.5 keV low-abundance (Z < 0.03 Zsolar) "thermal plasma," with ~10% of the flux of either of the first two components. The X-ray luminosity of the 3rd component (the "soft excess") is ~1.4E40 erg/s, or ~5X that of all of the detected extranuclear X-ray sources. We suggest that most (~75-80%) of the soft excess emission originates from 1" < r < 3", which is not imaged in our observation due to severe CCD pile-up. We also require the cold reflector to be positioned at least 1" (158 pc) from the nucleus, since there is no reflection component in the X-ray core spectrum. Much of the extranuclear X-ray emission is coincident with radio structures (nuclear radio bubbles and large-scale radio features), and its soft X-ray luminosity is generally consistent with luminosities expected from a starburst-driven wind (with the starburst scaled from L_FIR). However, the AGN in NGC 2992 seems equally likely to power the galactic wind in that object. Furthermore, AGN photoionization and photoexcitation processes could dominate the soft excess, especially the \~75-80% which is not imaged by our observations.Comment: 34 pages AASTEX, 9 (low-res) PS figures, ApJ, in press. For full-resolution postscript file, visit http://www.pha.jhu.edu/~colbert/n2992_chandra.ps.g