The Calculation of the Bending Moment Response of a Typical Launch Vehicle Using Generalized Power Spectral Techniques

Bending moment response calculation of launch vehicle using generalized power spectral technique

Extreme Enhancements of r-process Elements in the Cool Metal-Poor Main-Sequence Star SDSS J2357-0052

We report the discovery of a cool metal-poor, main-sequence star exhibiting large excesses of r-process elements. This star is one of two newly discovered cool subdwarfs (effective temperatures of 5000 K) with extremely low metallicity ([Fe/H]<-3) identified from follow-up high-resolution spectroscopy of metal-poor candidates from the Sloan Digital Sky Survey. SDSS J2357-0052 has [Fe/H]=-3.4 and [Eu/Fe]=+1.9, and exhibits a scaled solar r-process abundance pattern of heavy neutron-capture elements. This is the first example of an extremely metal-poor, main-sequence star showing large excesses of r-process elements; all previous examples of the large r-process-enhancement phenomena have been associated with metal-poor giants. The metallicity of this object is the lowest, and the excess of Eu ([Eu/Fe]) is the highest, among the r-process-enhanced stars found so far. We consider possible scenarios to account for the detection of such a star, and discuss techniques to enable searches for similar stars in the future.Comment: 16 pages, 3 figures, 2 tables, ApJL in pres

Streamlining the integration between INNOPAC’s electronic course reserves and WebCT.

This article is a discussion of how electronic information resources can be used inside the online academic environment and in particular how the electronic course reserves (ECR) module of INNOPAC can be integrated with the WebCT environment. In the online academic environment, the trend is for information sources to be integrated and made available via a single point of entry. Such information sources mainly consist of copyrighted material that is effectively managed by ECR systems. These systems administer and control access to the copyrighted material, that is ECR documents. This article consists of two parts. The first focuses on the online academic environment and the role of the Internet. It continues with a brief discussion of the online academic information sources and virtual libraries. The latter part of the article focuses on the Rand Afrikaans University’s online academic environment and a practical method of integrating an ECR system with this online environment

Rethinking visual journaling in the creative process: Exploring pedagogic implications

I lecture jewellery design at a university of technology in South Africa. Through this study, I wish to arrive at a deeper understanding of my own creative process, so that I can facilitate the creative development of my students. The focus of this paper is the visual journal, or reflective sketchbook, which I require my students to keep. To establish the relationship between my creative practice and visual journaling, I analysed a creative poetic performance I delivered at the South African Educational Research Association’s (SAERA) 2016 conference. Using the little-c definition of creativity, I analyse the threads that constituted and contributed to my performance, to see how aspects of self-manifested within this creative process. I did the analysis by conducting an autoethnographic self-interview, and then examining the responses. To my surprise, I discovered that the inspiration for my own creative work does not necessarily originate in my visual journal and that the visual journal could play a more useful role, if used as a prompt for reflective conversations

Cross sections for the production of fragments with Z greater than or equal to 8 by fragmentation of Z greater than or equal to 9 and less than or equal to 26 nuclei

Charge changing nuclear collisions in plastic nuclear track detectors were studied using a new experimental technique of automatic track measurement for etched tracks in plastic detectors. Partial cross sections for the production of fragments of charge Z approximately 8 were measured for projectile nuclei of charge 9 approximately Z approximately 26 in the detector material CR39 and in silver. for this purpose three independent experiments were performed using Bevalac beams. The first one was an exposure of a stack of CR39 plastic plates to 1.8 GeV/nucl. Ar-40 nuclei. The second one was an exposure of another CR39 stack of 1.7 GeV/nucl. Fe-56 projectiles. In the third experiment a mixed stack of CR39 plates and silver foils was irradiated with 1.7 GeV/nucl. Fe-56 nuclei. Thus the measurement of nuclear cross sections in a light target (CR39 = C12H18O7) and as well in a heavy target (silver) was possible