Self-consistent description of nuclear compressional modes

Isoscalar monopole and dipole compressional modes are computed for a variety of closed-shell nuclei in a relativistic random-phase approximation to three different parametrizations of the Walecka model with scalar self-interactions. Particular emphasis is placed on the role of self-consistency which by itself, and with little else, guarantees the decoupling of the spurious isoscalar-dipole strength from the physical response and the conservation of the vector current. A powerful new relation is introduced to quantify the violation of the vector current in terms of various ground-state form-factors. For the isoscalar-dipole mode two distinct regions are clearly identified: (i) a high-energy component that is sensitive to the size of the nucleus and scales with the compressibility of the model and (ii) a low-energy component that is insensitivity to the nuclear compressibility. A fairly good description of both compressional modes is obtained by using a ``soft'' parametrization having a compression modulus of K=224 MeV.Comment: 28 pages and 10 figures; submitted to PR

Repatriating more than Mapungubwe human remains: archaeological material culture, a shared future and an artificially divided past

Apartheid's lingering ghost ensures that repatriation processes in South Africa are complex. Apartheid ideology not only separated black and white, but also made ethnicity the prime identity for Africans, many of whom internalised it. South Africa's ethicised past ensured that the process of repatriating Mapungubwe human remains was framed in ethnic terms. This resulted in quarrels between claimant communities, who tried to authenticate their claims by proving sole ownership of the human remains. In this potentially volatile context archaeologists were not only negotiating responsible repatriation, but also had to consider their role in a divided present, as squabbles over repatriation could harm both the dead and the living. Fluid group membership involved in the negotiation for the return of human remains from Mapungubwe meant that it would be difficult to exclude any claimants. It was therefore agreed that conflicting oral traditions should be viewed as equal, even when not supported by archaeological data. This acceptance of multivocality resulted in a joint claim by representatives of the Mapungubwe descendants.http://www.tandfonline.com/loi/cjca2

Role of substrate clamping on anisotropy and domain structure in the canted antiferromagnet alpha Fe2O3

Antiferromagnets have recently been propelled to the forefront of spintronics by their high potential for revolutionizing memory technologies. For this, understanding the formation and driving mechanisms of the domain structure is paramount. In this work, we investigate the domain structure in a thin film canted antiferromagnet amp; 945; amp; 8722;Fe2O3. We find that the internal destressing fields driving the formation of domains do not follow the crystal symmetry of amp; 945; amp; 8722;Fe2O3, but fluctuate due to substrate clamping. This leads to an overall isotropic distribution of the N el order with locally varying effective anisotropy in antiferromagnetic thin films. Furthermore, we show that the weak ferromagnetic nature of amp; 945; amp; 8722;Fe2O3 leads to a qualitatively different dependence on the magnetic field compared to collinear antiferromagnets such as NiO. The insights gained from our work serve as a foundation for further studies of electrical and optical manipulation of the domain structure of antiferromagnetic thin film

How applicants want and expect to be treated: Applicants` selection treatment beliefs and the development of the Social Process Questionnaire on Selection.

In psychology, general beliefs are considered to be the stepping-stones of future behavior and attitudes (Rokeach, 1973; Olson, Roese, & Zanna, 1996). The goal of this paper is to explore applicants' general beliefs about the selection treatment, namely the way they want and expect to be treated during selection. After the concept of selection treatment beliefs is introduced and both its theoretical and practical relevance is highlighted, the development of the Social Process Questionnaire on Selection (SPQS) is reported, which measures selection treatment beliefs. Factor analyses (660 students and 643 applicants) revealed six treatment factors. Applicants valued and expected transparency, objectivity, feedback, Job information, participation, and a humane treatment. Apparently, applicants valued the six factors more than they expected them to be realized. The scientific and practical relevance of the findings are discussed