A near-infrared study of the star forming region RCW 34

We report the results of a near-infrared imaging study of a $7.8 \times 7.8$ arcmin$^2$ region centered on the 6.7 GHz methanol maser associated with the RCW 34 star forming region using the 1.4m IRSF telescope at Sutherland. A total of 1283 objects were detected simultaneously in J, H, and K for an exposure time of 10800 seconds. The J-H, H-K two-colour diagram revealed a strong concentration of more than 700 objects with colours similar to what is expected of reddened classical T Tauri stars. The distribution of the objects on the K {\it vs} J-K colour-magnitude diagram is also suggestive that a significant fraction of the 1283 objects is lower mass pre-main sequence stars. We also present the luminosity function for the subset of about 700 pre-main sequence stars and show that it suggests ongoing star formation activity for about $10^7$ years. An examination of the spatial distribution of the pre-main sequence stars shows that the fainter (older) part of the population is more dispersed over the observed region and the brighter (younger) subset is more concentrated around the position of the O8.5V star. This suggests that the physical effects of the O8.5V star and the two early B-type stars on the remainder of the cloud out of which they formed, could have played a role in the onset of the more recent episode of star formation in RCW 34.Comment: Accepted for publication in The Astronomical Journa

Weak antilocalization in epitaxial graphene: evidence for chiral electrons

Transport in ultrathin graphite grown on silicon carbide is dominated by the electron-doped epitaxial layer at the interface. Weak anti-localization in 2D samples manifests itself as a broad cusp-like depression in the longitudinal resistance for magnetic fields 10 mT$< B <$ 5 T. An extremely sharp weak-localization resistance peak at B=0 is also observed. These features quantitatively agree with graphene weak-(anti)localization theory implying the chiral electronic character of the samples. Scattering contributions from the trapped charges in the substrate and from trigonal warping due to the graphite layer on top are tentatively identified. The Shubnikov-de Haas oscillations are remarkably small and show an anomalous Berry's phase.Comment: 5 pages, 4 figures. Minor change

Workplace spirituality and job satisfaction

Published ArticleIn order to obtain an improved understanding of behaviour at work, employees should be studied from physical, psychological, and spiritual dimensions. Although the physical and psychological dimensions of individuals at work have been studied extensively, the spiritual dimension has been neglected for many years. The objective of the current research was to determine the relationship between workplace spirituality and a positive attitude related to work, that is, job satisfaction. A cross-sectional study was conducted with a sample of 600 white-collar workers, chosen from two organizations in different industries in South Africa. The research results indicate that there is a positive relationship between workplace spirituality and job satisfaction. These fi ndings deepen the understanding of personal spirituality, organizational spirituality, and job satisfaction. They bring new insights into the signifi cant role which spirituality plays in the context of the workplace. To survive in the 21st century, organizations need to be spiritually based. This, in turn, will lead to workers being satisfi ed with their entire work experience

The Experience of Spirituality in a Multicultural and Diverse Work Environment

Published ArticleWorldwide, the study of spirituality is receiving increased attention, but very little is known about spirituality and its manifestation in African organizations. The aim of this research was to explore the experience of spirituality in a multicultural and diverse working environment, in order to enhance understanding of the functioning of spirituality in relation to diversity in the workplace. In particular, the study explores workplace spirituality from an individual and an organizational perspective within diverse organizations operating within a multicultural society. A cross-sectional study was conducted with a sample of 600 white collar workers from two organizations in different industries in South Africa. The research findings indicate that there is an inverse relationship between workplace spirituality and individual spirituality. Furthermore, the study confirmed that the experience of both personal and organizational spirituality is impacted by several diversity characteristics within a multicultural environment. In order to improve understanding of the experience of spirituality in multicultural societies and organizations, further empirical research is recommended. Globally, organizations need to realize the importance of embracing spirituality, in order to function effectively in a multicultural environment

Die devitaliseringsdialektiek van die skool: enkele fundamentele probleme

Historically the school has been subject to a de-/vitalizing power-play fulfilled through the manipulative power of holders of power under the primacy of a specific religious ground motif The result has been that the school is seemingly experiencing an identity crisis because of the incomplete definition of its task of educative teaching, because man/power-holders have historically been wont to regard himself/themselves as the justified determiner of meaning of his/their structures. Subsequently the school's foundational function, its destinational function and its sphere of competence have been defined by way of apostatic ground motifs and secular points of departure. Thus the school has been subjected to a never-ending, self-denying bipolar play of power which can be self-undermining. While no power-play can be driven to its fullest consequences, 1school reforms* have been self-abortive in nature. There is therefore the demand to provide the school with a stable value system which for the Christian is situated in the creation-fall-redemption religious ground motif which places man in a radical Creator-creature relationship

Measuring spirituality in South Africa: Validation of instruments developed in the USA

Published ArticleSpirituality is receiving increased attention in the context of the workplace. Research consistently shows that spirituality is signifi cantly correlated with mental health and well-being. Most of the research on spirituality, particularly in the context of the workplace, is conducted with instruments developed in the USA. However, the inter-cultural measurement of constructs remains a concern, because instruments developed in one culture are not necessarily transferable to another culture. In the current study, the transferability of two spiritual measures developed in the USA, namely the Human Spirituality Scale (HSS) and the Organizational Spirituality Values Scale (OSVS) are considered for a sample from South Africa. The results confi rm the construct validity of the HSS and the OSVS, but indicate that the factor structures of the HSS and the OSVS should be analysed and reconfi rmed when used, particularly in a South African sample. The study provides evidence that the HSS and the OSVS cannot be transferred indiscriminately to a South African sample. This insight contributes to the quality of future research studies in South Africa, not only on the important aspect of spirituality, but also when applying instruments developed elsewhere in the world

Evidence for Interlayer Electronic Coupling in Multilayer Epitaxial Graphene from Polarization Dependent Coherently Controlled Photocurrent Generation

Most experimental studies to date of multilayer epitaxial graphene on C-face SiC have indicated that the electronic states of different layers are decoupled as a consequence of rotational stacking. We have measured the third order nonlinear tensor in epitaxial graphene as a novel approach to probe interlayer electronic coupling, by studying THz emission from coherently controlled photocurrents as a function of the optical pump and THz beam polarizations. We find that the polarization dependence of the coherently controlled THz emission expected from perfectly uncoupled layers, i.e. a single graphene sheet, is not observed. We hypothesize that the observed angular dependence arises from weak coupling between the layers; a model calculation of the angular dependence treating the multilayer structure as a stack of independent bilayers with variable interlayer coupling qualitatively reproduces the polarization dependence, providing evidence for coupling.Comment: submitted to Nano Letter

Half integer quantum Hall effect in high mobility single layer epitaxial graphene

The quantum Hall effect, with a Berry's phase of $\pi$ is demonstrated here on a single graphene layer grown on the C-face of 4H silicon carbide. The mobility is $\sim$ 20,000 cm$^2$/V$\cdot$s at 4 K and ~15,000 cm$^2$/V$\cdot$s at 300 K despite contamination and substrate steps. This is comparable to the best exfoliated graphene flakes on SiO$_2$ and an order of magnitude larger than Si-face epitaxial graphene monolayers. These and other properties indicate that C-face epitaxial graphene is a viable platform for graphene-based electronics.Comment: Some modifications in the text and figures, 7 pages, 2 figure