Code Validation Study for Base Flows

New and old rocket launch concepts recommend the clustering of motors for improved lift capability. The flowfield of the base region of the rocket is very complex and can contain high temperature plume gases. These hot gases can cause catastrophic problems if not adequately designed for. To assess the base region characteristics, advanced computational fluid dynamics (CFD) is being used. As a precursor to these calculations the CFD code requires validation on base flows. The primary objective of this code validation study was to establish a high level of confidence in predicting base flows with the USA CFD code. USA has been extensively validated for fundamental flows and other applications. However, base heating flows have a number of unique characteristics so it was necessary to extend the existing validation for this class of problems. In preparation for the planned NLS 1.5 Stage base heating analysis, six case sets were studied to extend the USA code validation data base. This presentation gives a cursive review of three of these cases. The cases presented include a 2D axi-symmetric study, a 3D real nozzle study, and a 3D multi-species study. The results of all the studies show good general agreement with data with no adjustments to the base numerical algorithms or physical models in the code. The study proved the capability of the USA code for modeling base flows within the accuracy of available data

College Students’ Sense Of Cycling Capability Deters Helmet Use: Implications For Safety Helmet Ordinances

Proponents frequently cite increased injury protection as a reason for supporting bicycle helmet ordinances; yet, many cyclists oppose such policies. In this study, six focus groups of college students discussed cycling behaviors and attitudes toward using bicycle safety helmets, and perceptions of the local helmet ordinance. The usual concerns were voiced such as “inconvenience” and “helmet hair”. Participants reported very high confidence in their cycling ability and their ability to avoid a crash which might require a helmet. They failed to take into account external factors or the actions of others which may increase risk for injury. They also did not understand how health insurance spreads the financial risk for traumatic events. These findings have implications for designing education campaigns to promote college student health, as well as initiatives for helmet ordinance advocacy.

Building a Model of Collaboration Between Historically Black and Historically White Universities

Despite increases over the last two decades in the number of degrees awarded to students from underrepresented groups in science, technology, engineering, and mathematics (STEM) disciplines, enhancing diversity in these disciplines remains a challenge. This article describes a strategic approach to this challenge—the development of a collaborative partnership between two universities: the historically Black Elizabeth City State University and the historically White University of New Hampshire. The partnership, a type of learning organization built on three mutually agreed upon principles, strives to enhance opportunities for underrepresented students to pursue careers in the STEM disciplines. This article further describes six promising practices that framed the partnership, which resulted in the submission of nine proposals to federal agencies and the funding of four grants that led to the implementation, research, learning, and evaluation that followed

Radio Observations of the Hubble Deep Field South region: I. Survey Description and Initial Results

This paper is the first of a series describing the results of the Australia Telescope Hubble Deep Field South (ATHDFS) radio survey. The survey was conducted at four wavelengths - 20, 11, 6, and 3 cm, over a 4-year period, and achieves an rms sensitivity of about 10 microJy at each wavelength. We describe the observations and data reduction processes, and present data on radio sources close to the centre of the HDF-S. We discuss in detail the properties of a subset of these sources. The sources include both starburst galaxies and galaxies powered by an active galactic nucleus, and range in redshift from 0.1 to 2.2. Some of them are characterised by unusually high radio-to-optical luminosities, presumably caused by dust extinction.Comment: Accepted by AJ. 32 pages, 4 tables, 3 figures. PDF with full-resolution figures is on http://www.atnf.csiro.au/people/rnorris/N197.pd

The Ursinus Weekly, December 17, 1969

Special centennial issue: Ursinus College\u27s 100th Anniversary, 1869-1969 • Editorial: The first hundred years • Focus: Nora Shuler Helfferich, Ursinus College\u27s oldest living alumnus • Reprinted articles: Pa. Governor Martin salutes President McClure and college at ceremony commemorating seventy-fifth anniversary; Ursinus adopts a war time program; Ursinus recipient of new gateway; Apology for peace; Freshman coed evaluates customs, finds friendly spirit on U.C. campus; Customs are savored; Chaperon, Why? Who?; WSGA is frowning on dungarees, slacks for Ursinus campus wear; When Shriner shrieks Ursinus sheiks come dashing from each dorm; Freshman President snatched by Sophs; Ursinus offers special class • Freeland Hall: Don\u27t let it be forgot • Ursinus raises $2,350,000;$550,000 still needed • Search into history substantiates claim of second oldest graduate that Freeland was everything • Ursinus administrators analyze past, present, and future • 1969 season climaxes 76 years • Mangan wins little All-American mention • Bears\u27 football since 1893 • Ray Gurzynski pilots Bear Harriers to 45-4 mark, two championships • Fifty years of girls\u27 field hockey at UC: Bearites to Snell-belles and champs • Albert leads UC Harriers to MAC championship • Footmen end season with 6-win record • 1969 MAC grid statistics • Concise history of Ursinus College: 1869 - present • Ursinus College: One century old, before and afterhttps://digitalcommons.ursinus.edu/weekly/1153/thumbnail.jp

Cardiovascular magnetic resonance of the charcoal heart

We report a case of malignant melanoma metastasis to the heart presenting as complete heart block. The highlight of the case is to demonstrate that silent cardiac metastasis is not uncommon and CMR has the potential to characterize these cardiac metastases and should be used routinely as a screening tool for those cancers with a high chance of cardiac involvement

Dynamics of orographic gravity waves observed in the mesosphere over Auckland Islands during the Deep Propagating Gravity Wave Experiment (DEEPWAVE)

On 14 July 2014 during the Deep Propagating Gravity Wave Experiment (DEEPWAVE), aircraft remote sensing instruments detected large-amplitude gravity wave oscillations within mesospheric airglow and sodium layers at altitudes z ~ 78–83 km downstream of the Auckland Islands, located ~1000 km south of Christchurch, New Zealand. A high-altitude reanalysis and a three-dimensional Fourier gravity wave model are used to investigate the dynamics of this event. At 0700 UTC when the first observations were made, surface flow across the islands’ terrain generated linear three-dimensional wave fields that propagated rapidly to z ~ 78 km, where intense breaking occurred in a narrow layer beneath a zero-wind region at z ~ 83 km. In the following hours, the altitude of weak winds descended under the influence of a large-amplitude migrating semidiurnal tide, leading to intense breaking of these wave fields in subsequent observations starting at 1000 UTC. The linear Fourier model constrained by upstream reanalysis reproduces the salient aspects of observed wave fields, including horizontal wavelengths, phase orientations, temperature and vertical displacement amplitudes, heights and locations of incipient wave breaking, and momentum fluxes. Wave breaking has huge effects on local circulations, with inferred layer-averaged westward flow accelerations of ~350 m s−1 h−1 and dynamical heating rates of ~8 K h−1, supporting recent speculation of important impacts of orographic gravity waves from subantarctic islands on the mean circulation and climate of the middle atmosphere during austral winter