How typical is the Coma cluster?

Coma is frequently used as the archetype z~0 galaxy cluster to compare higher redshift work against. It is not clear, however, how representative the Coma cluster is for galaxy clusters of its mass or X-ray luminosity, and significantly: recent works have suggested that the galaxy population of Coma may be in some ways anomolous. In this work, we present a comparison of Coma to an X-ray selected control sample of clusters. We show that although Coma is typical against the control sample in terms of its internal kinematics (substructure and velocity dispersion profile), it has a significantly high (~3sigma) X-ray temperature set against clusters of comparable mass. By de-redshifting our control sample cluster galaxies star-formation rates using a fit to the galaxy main sequence evolution at z < 0.1, we determine that the typical star-formation rate of Coma galaxies as a function of mass is higher than for galaxies in our control sample at a confidence level of > 99 per cent. One way to alleviate this discrepency and bring Coma in-line with the control sample would be to have the distance to Coma to be slightly lower, perhaps through a non-negligible peculiar velocity with respect to the Hubble expansion, but we do not regard this as likely given precision measurements using a variety of approaches. Therefore in summary, we urge caution in using Coma as a z~0 baseline cluster in galaxy evolution studies.Comment: accepted for publication in MNRA

Input guide for computer programs to generate thermodynamic data for air and Freon CF4

FORTRAN computer programs were developed to calculate the thermodynamic properties of Freon 14 and air for isentropic expansion from given plenum conditions. Thermodynamic properties for air are calculated with equations derived from the Beattie-Bridgeman nonstandard equation of state and, for Freon 14, with equations derived from the Redlich-Quang nonstandard equation of state. These two gases are used in scale model testing of model rocket nozzle flow fields which requires simulation of the prototype plume shape with a cold flow test approach. Utility of the computer programs for use in analytical prediction of flow fields is enhanced by arranging card or tape output of the data in a format compatible with a method-of-characteristics computer program

Analysis of SRM model nozzle calibration test data in support of IA12B, IA12C and IA36 space shuttle launch vehicle aerodynamics tests

Variations of nozzle performance characteristics of the model nozzles used in the Space Shuttle IA12B, IA12C, IA36 power-on launch vehicle test series are shown by comparison between experimental and analytical data. The experimental data are nozzle wall pressure distributions and schlieren photographs of the exhaust plume shapes. The exhaust plume shapes were simulated experimentally with cold flow while the analytical data were generated using a method-of-characteristics solution. Exhaust plume boundaries, boundary shockwave locations and nozzle wall pressure measurements calculated analytically agree favorably with the experimental data from the IA12C and IA36 test series. For the IA12B test series condensation was suspected in the exhaust plumes at the higher pressure ratios required to simulate the prototype plume shapes. Nozzle calibration tests for the series were conducted at pressure ratios where condensation either did not occur or if present did not produce a noticeable effect on the plume shapes. However, at the pressure ratios required in the power-on launch vehicle tests condensation probably occurs and could significantly affect the exhaust plume shapes

Higher Education Collaboratives for Community Engagement and Improvement

Our society is in a period of dramatic change with the transition from an industrial-based to a knowledge-based economy, as well as technological advances, fiscal challenges of higher education, and cultural shifts in society as a whole. Increasing collaborations between communities and universities in order to influence the public good becomes paramount during this time of dramatic change. As frustratingly slow as the movement to strengthen the relationship between higher education and society sometimes seems to be, few social institutions are better situated than colleges and universities to stimulate significant community improvement. Individually and collectively, institutions of higher education possess considerable resources—human, fiscal, organizational, and intellectual— which are critical to addressing significant social issues. Additionally, these institutions are physically rooted in their communities. Therefore, investing in the betterment of their immediate environments is good for both the community and the institution. However, it is recognized that higher education institutions often fall short of making a real impact in their home communities. Therefore, a conference was convened to examine the current and evolving role of higher education institutions, particularly those operating within the context of coalitions, consortia and state systems, to catalyze change on issues affecting communities and society as a whole. Specifically, the focus of the conference was to develop and strengthen an understanding of how higher education might work more effectively with communities and we believe that consortia or collaboratives of higher education institutions, along with community partners, can learn from one another. Cooperation between efforts is important. The papers offered in this monograph are the result of the Wingspread Conference on Higher Education Collaboratives for Community Engagement and Improvement, conducted on October 27-29, 2004, in Racine, Wisconsin. The conference, the second of a three-part series, was sponsored by the National Forum on Higher Education for the Public Good at the University of Michigan School of Education, the Johnson Foundation, Atlantic Philanthropies, and the W.K. Kellogg Foundation. The first conference in the series held in October 2003 and titled Public Understanding, Public Support and Public Policy focused on higher education’s role in society and the concluding conference will be held in the fall of 2005

‘Section 28’ and the pre-recording of cross-examination: What can advocates expect in 2018?

This article first appeared in Criminal Law and Justice weekly – (2018) 182 JPN 7-10. And can be found here: https://www.criminallawandjustice.co.uk/features/%E2%80%9CSection-28%E2%80%9D-and-Pre-Recording-Cross-ExaminationIn 2018, so long as the recently identified technological issues are remedied (rumoured to be about storage capacity for the recordings), pre-recorded cross-examination will be rolled out across Crown Courts in England and Wales. The process evaluation report (MoJ, 2016) for the pilot of section 28 Youth Justice and Criminal Evidence Act 1999 (YJCEA 1999) was encouraging as well as realistic; it acknowledged that findings might not be replicated on roll-out because courts in the study might not being representative of courts in general. The authors believe that the success of the scheme substantially rests in the hands of judges and practitioners. Here we briefly summarise the background to the roll-out, highlight some important aspects of the new guidance in the Criminal Practice Directions (CPD), illustrate practice with real case studies, and discuss the implications for professional development

Assessment of analytical and experimental techniques utilized in conducting plume technology tests 575 and 593

Since exhaust plumes affect vehicle base environment (pressure and heat loads) and the orbiter vehicle aerodynamic control surface effectiveness, an intensive program involving detailed analytical and experimental investigations of the exhaust plume/vehicle interaction was undertaken as a pertinent part of the overall space shuttle development program. The program, called the Plume Technology program, has as its objective the determination of the criteria for simulating rocket engine (in particular, space shuttle propulsion system) plume-induced aerodynamic effects in a wind tunnel environment. The comprehensive experimental program was conducted using test facilities at NASA's Marshall Space Flight Center and Ames Research Center. A post-test examination of some of the experimental results obtained from NASA-MSFC's 14 x 14-inch trisonic wind tunnel is presented. A description is given of the test facility, simulant gas supply system, nozzle hardware, test procedure and test matrix. Analysis of exhaust plume flow fields and comparison of analytical and experimental exhaust plume data are presented

A Comparison of Young Children\u27s Writing Products in Skills-Based and Whole Language Classrooms

Whole language instruction and an emphasis on the writing process have had a significant impact on the teaching of writing. Many whole language teachers are already in practice, and more educators are moving toward this kind of teaching. However, comparative research on the value of whole language curriculum is limited. It is important to study children\u27s interpretations (Erickson and Shultz, 1992) as they are reflected in the written products they generate in different kinds of classrooms. We need to know more about the sense children make of their instruction, what they are learning about written language, and the kinds of writing they produce. The purpose of this article is to report on a two-year, descriptive study of eight, low-income children\u27s writing in skills-based and whole language instruction during kindergarten and first grade. Our focus was on the development of emergent writers in these two different kinds of instruction

Detection of ionized gas in the globular cluster 47 Tucanae

We report the detection of ionized intracluster gas in the globular cluster 47 Tucanae. Pulsars in this cluster with a negative period derivative, which must lie in the distant half of the cluster, have significantly higher measured integrated electron column densities than the pulsars with a positive period derivative. We derive the plasma density within the central few pc of the cluster using two different methods which yield consistent values. Our best estimate of n_e = (0.067+-0.015)/cm^3 is about 100 times the free electron density of the ISM in the vicinity of 47 Tucanae, and the ionized gas is probably the dominant component of the intracluster medium.Comment: 5 pages, 3 included figures, accepted for publication by ApJ Letter

Implications for the origin of dwarf early-type galaxies: a detailed look at the isolated rotating dwarf early-type galaxy CG 611, with ramifications for the Fundamental Plane's (S_K)^2 kinematic scaling and the spin-ellipticity diagram

Selected from a sample of nine, isolated, dwarf early-type galaxies (ETGs) having the same range of kinematic properties as dwarf ETGs in clusters, we use CG 611 (LEDA 2108986) to address the Nature versus Nurture debate regarding the formation of dwarf ETGs. The presence of faint disk structures and rotation within some cluster dwarf ETGs has often been heralded as evidence that they were once late-type spiral or dwarf irregular galaxies prior to experiencing a cluster-induced transformation into an ETG. However, CG 611 also contains significant stellar rotation (~20 km/s) over its inner half light radius, R_(e,maj)=0.71 kpc, and its stellar structure and kinematics resemble those of cluster ETGs. In addition to hosting a faint young nuclear spiral within a possible intermediate-scale stellar disk, CG 611 has accreted an intermediate-scale, counter-rotating gas disk. It is therefore apparent that dwarf ETGs can be built by accretion events, as opposed to disk-stripping scenarios. We go on to discuss how both dwarf and ordinary ETGs with intermediate-scale disks, whether under (de)construction or not, are not fully represented by the kinematic scaling S_0.5=sqrt{ 0.5(V_rot)^2 + sigma^2 }, and we also introduce a modified spin-ellipticity diagram, lambda(R)-epsilon(R), with the potential to track galaxies with such disks.Comment: 15 pages (includes 9 figures and an extensive 2+ page reference list