Extensions of Fractional Precolorings show Discontinuous Behavior

We study the following problem: given a real number k and integer d, what is the smallest epsilon such that any fractional (k+epsilon)-precoloring of vertices at pairwise distances at least d of a fractionally k-colorable graph can be extended to a fractional (k+epsilon)-coloring of the whole graph? The exact values of epsilon were known for k=2 and k\ge3 and any d. We determine the exact values of epsilon for k \in (2,3) if d=4, and k \in [2.5,3) if d=6, and give upper bounds for k \in (2,3) if d=5,7, and k \in (2,2.5) if d=6. Surprisingly, epsilon viewed as a function of k is discontinuous for all those values of d

How Students Learn Best: An Analysis of Demonstrations, Labs, and Scenario-Based Teaching

The purpose of this study is to analyze how students learn best and to discover the methods in which they like to learn new information. Students often find learning in science classrooms difficult or uninteresting. My goal as a future science teacher is to stimulate students so that they are interested in learning the processes and findings of science. There are a myriad of ways that researchers and science teachers think that students can be engaged, such as demonstrations, labs, and scenario-based teaching. I would like to survey students, mainly freshmen in introductory classes, and ask them if they prefer to learn by demonstrations, labs, or scenario-based teaching. I am hoping this information will benefit me in my future classroom so that I may connect with as many of my students as possible and elevate students\u27 knowledge of science

"The good days are amazing", an evaluation of the Writer's in Prison Network

The Writers in Prison Network (WIPN) was established and appointed by the Arts Council in April 1998 to administer the Writers in Residence in Prison Scheme. The Scheme places writers and creative artists into prisons across the UK to deliver creative writing, drama, video, music, oral storytelling, journalism, creative reading and publishing programmes. The Scheme employs writers who are experienced or established in particular literary fields; many have been creative writing tutors, or have worked in publishing, the theatre, television, radio or journalism. In administering the Scheme, WIPN supports up to 20 Writers in Residence at any one time (with an average of 15-16 residencies per year and a maximum of 22 residencies per year undertaken during the lifetime of WIPN). In 2010 the Hallam Centre for Community Justice at Sheffield Hallam University was commissioned to undertake an evaluation of the Writers in Prison Network. The evaluation was primarily qualitative in approach which aimed to inform and support the future development of WIPN

Blockage and flow studies of a generalized test apparatus including various wing configurations in the Langley 7-inch Mach 7 Pilot Tunnel

A 1/12th scale model of the Curved Surface Test Apparatus (CSTA), which will be used to study aerothermal loads and evaluate Thermal Protection Systems (TPS) on a fuselage-type configuration in the Langley 8-Foot High Temperature Structures Tunnel (8 ft HTST), was tested in the Langley 7-Inch Mach 7 Pilot Tunnel. The purpose of the tests was to study the overall flow characteristics and define an envelope for testing the CSTA in the 8 ft HTST. Wings were tested on the scaled CSTA model to select a wing configuration with the most favorable characteristics for conducting TPS evaluations for curved and intersecting surfaces. The results indicate that the CSTA and selected wing configuration can be tested at angles of attack up to 15.5 and 10.5 degrees, respectively. The base pressure for both models was at the expected low level for most test conditions. Results generally indicate that the CSTA and wing configuration will provide a useful test bed for aerothermal pads and thermal structural concept evaluation over a broad range of flow conditions in the 8 ft HTST

Collections Sustainable Storage Initiative

The Worcester Art Museum is seeking a Planning Grant to develop its Collections Sustainable Storage Initiative (CSSI), an updated comprehensive Report and Master Plan of its collections storage spaces, environmental control and safety systems. A multi-disciplinary team is assembled to perform this work including consulting architects and engineers. As part of this effort the Museum will also implement the environmental data logging and analysis recommended by team consultant Image Permanence Institute (IPI). The planning goal is to develop ecologically sound, efficient, and sustainable guidelines supporting the Museum's collections storage spaces, storage furniture systems, environmental monitoring and control systems, as well as safety and protection systems. The CSSI Report will then form the basis for rethinking the existing connections between storage and permanent collections, and guide the way to more efficient and sustainable collections preservation

5-choosability of graphs with crossings far apart

We give a new proof of the fact that every planar graph is 5-choosable, and use it to show that every graph drawn in the plane so that the distance between every pair of crossings is at least 15 is 5-choosable. At the same time we may allow some vertices to have lists of size four only, as long as they are far apart and far from the crossings.Comment: 55 pages, 11 figures; minor revision according to the referee suggestion

On the Role of NAO Driven Interannual Variability in Rainfall Seasonality on Water Resources and Hydrologic Design in a Typical Mediterranean Basin

In the last several decades, extended dry periods have affected the Mediterranean area with dramatic impacts on water resources. Climate models are predicting further warming, with negative effects on water availability. The authors analyze the hydroclimatic tendencies of a typical Mediterranean basin, the Flumendosa basin located in Sardinia, an island in the center of the Mediterranean Sea, where in the last 30 years a sequence of dry periods has seriously impacted the water management system. Interestingly, in the historic record the annual runoff reductions have been more pronounced than the annual precipitation reductions. This paper performs an analysis that links this runoff decrease to changes in the total annual precipitation and its seasonal structure. The seasonality is a key determinant of the surface runoff process, as it reflects the degree to which rainfall is concentrated during the winter. The observed reductions in winter precipitation are shown here to be well correlated (Pearson correlation coefficient of −0.5) with the North Atlantic Oscillation (NAO) index. Considering the predictability of the winter NAO, there is by extension an opportunity to predict future winter precipitation and runoff tendencies. The recent hydroclimatic trends are shown to impact hydrologic design criteria for water resources planning. The authors demonstrate that there is a dangerous increase of the drought severity viewed from the perspective of water resources planning

Evaluation of the South Yorkshire Restorative Justice programme (SYRJP)

The SYRJP was developed in partnership between South Yorkshire Police and the Local Criminal Justice Board (LCJB) with the aim of implementing a county wide model of Restorative Justice (RJ) for use in neighbourhood policing and other community applications. It is aimed at tackling low level crime and anti-social behaviour in neighbourhoods and gives police officers the discretion to use Youth and Adult Restorative disposals as an alternative to prosecution for low level offending behaviour where offenders have no previous convictions, make an admission of guilt and where both offender and victim consent to the RJ process

HIM-10 is required for kinetochore structure and function on Caenorhabditis elegans holocentric chromosomes.

Macromolecular structures called kinetochores attach and move chromosomes within the spindle during chromosome segregation. Using electron microscopy, we identified a structure on the holocentric mitotic and meiotic chromosomes of Caenorhabditis elegans that resembles the mammalian kinetochore. This structure faces the poles on mitotic chromosomes but encircles meiotic chromosomes. Worm kinetochores require the evolutionarily conserved HIM-10 protein for their structure and function. HIM-10 localizes to the kinetochores and mediates attachment of chromosomes to the spindle. Depletion of HIM-10 disrupts kinetochore structure, causes a failure of bipolar spindle attachment, and results in chromosome nondisjunction. HIM-10 is related to the Nuf2 kinetochore proteins conserved from yeast to humans. Thus, the extended kinetochores characteristic of C. elegans holocentric chromosomes provide a guide to the structure, molecular architecture, and function of conventional kinetochores