Fractal based observables to probe jet substructure of quarks and gluons

New jet observables are defined which characterize both fractal and scale-dependent contributions to the distribution of hadrons in a jet. These infrared safe observables, named Extended Fractal Observables (EFOs), have been applied to quark-gluon discrimination to demonstrate their potential utility. The EFOs are found to be individually discriminating and only weakly correlated to variables used in existing discriminators. Consequently, their inclusion improves discriminator performance, as here demonstrated with particle level simulation from the parton shower

The Impact of Land Fragmentation on Beef Cattle Inventory

Many groups have discussed with alarm the impact of agricultural land conversion to non-agricultural uses. This research indicates little evidence that beef cow inventory has been negatively affected by land fragmentation. Average acres per transaction, total transactions, or a fragmentation index did not have an important effect on cattle inventory.Land Economics/Use, Livestock Production/Industries,

Ariel - Volume 5 Number 3

Editor J.D. Kanofsky Entertainment Editors Robert Breckenridge Gary Kaskey Overseas Editor Mike Sinason Staff Ken Jaffe Bob Sklaroff Janet Weish David Jacoby Circulation Editor Jay Amsterdam Humorist Jim McCan

Quality assurance policies and implementation in nursing and midwifery training colleges in Ghana

The study assessed internal quality assurance (QA) systems in health training institutions in the Upper West Region. The study adopted the cross-section analytical design with a sample size of 272 (67 health tutors and 205 final year nursing students) using systematic and purposive sampling techniques. Data for the study were collected with a questionnaire and analyzed using SPSS and Stata. The study revealed that the majority (5 of 7) of nursing and midwifery colleges (NMTCs) in the Upper West Region have no quality assurance policy available, 65.7% of tutors indicated their institutions had quality assurance units/committees however these committees are inactive the total level of QA practices/implementation rate was low among colleges in the region. The study also revealed a lack of participatory governance and the existence of a poor communication system between staff and heads. The study contended that there is a need for heads (principals) of NMTCs in the Upper West region in Ghana should ensure the formation and functioning of QA units in their various institutions. These units should be empowered and allowed by heads to function as per recommendations by the regulatory bodies to support and to ensure quality training of nurses and midwives

Ariel - Volume 5 Number 4

Editors Mark Dembert J.D. Kanofskv Entertainment Editors Robert Breckenridge Joe Conti Overseas Editor Mike Sinason Photographer Scott Kastner Epistemologist Gary Kaskey Staff Ken Jaffe Bob Sklaroff Janet Weish David Jacoby Phil Nimoityn Circulation Editor Jay Amsterdam Humorist Jim Mccan

Using a probabilistic approach to derive a two-phase model of flow-induced cell migration

Interstitial fluid flow is a feature of many solid tumors. In vitro experiments have shown that such fluid flow can direct tumor cell movement upstream or downstream depending on the balance between the competing mechanisms of tensotaxis (cell migration up stress gradients) and autologous chemotaxis (downstream cell movement in response to flow-induced gradients of self-secreted chemoattractants). In this work we develop a probabilistic-continuum, two-phase model for cell migration in response to interstitial flow. We use a kinetic description for the cell velocity probability density function, and model the flow-dependent mechanical and chemical stimuli as forcing terms that bias cell migration upstream and downstream. Using velocity-space averaging, we reformulate the model as a system of continuum equations for the spatiotemporal evolution of the cell volume fraction and flux in response to forcing terms that depend on the local direction and magnitude of the mechanochemical cues. We specialize our model to describe a one-dimensional cell layer subject to fluid flow. Using a combination of numerical simulations and asymptotic analysis, we delineate the parameter regime where transitions from downstream to upstream cell migration occur. As has been observed experimentally, the model predicts downstream-oriented chemotactic migration at low cell volume fractions, and upstream-oriented tensotactic migration at larger volume fractions. We show that the locus of the critical volume fraction, at which the system transitions from downstream to upstream migration, is dominated by the ratio of the rate of chemokine secretion and advection. Our model also predicts that, because the tensotactic stimulus depends strongly on the cell volume fraction, upstream, tensotaxis-dominated migration occurs only transiently when the cells are initially seeded, and transitions to downstream, chemotaxis-dominated migration occur at later times due to the dispersive effect of cell diffusion