Chern-Simons action for inhomogeneous Virasoro group as an extension of three dimensional flat gravity

We initiate the study of a Chern-Simons action associated to the semi-direct sum of the Virasoro algebra with its coadjoint representation. This model extends the standard Chern-Simons formulation of three dimensional flat gravity and is similar to the higher-spin extension of three dimensional anti-de Sitter or flat gravity. The extension can also be constructed for the exotic but not for the cosmological constant deformation of flat gravity.Comment: 15 pages. Version to appear in J. of Math. Phy

SHRINKAGE IN TERNARY MIXES OF CONTAINER MEDIA

Based on functional relationships established for binary mixes of container media, a mathematical model is proposed for ternary component mixtures. Shrinkage values are generated for three-component mixtures based on mathematical equations. Empirically observed shrinkage values for corresponding three-component mixtures are determined and used as the basis for assessing the reliability of the proposed mathematical model for characterizing shrinkage in mixtures of container media. . Regression equations were developed and compared for both theoretical and empirical results

Interplay of spin-orbit coupling and Zeeman splitting in the absorption lineshape of 2D fermions

We suggest that electron spin resonance (ESR) experiment can be used as a probe of spinon excitations of hypothetical spin-liquid state of frustrated antiferromagnet in the presence of asymmetric Dzyaloshinskii-Moriya (DM) interaction. We describe assumptions under which the ESR response is reduced to the response of 2D electron gas with Rashba spin-orbit coupling. Unlike previous treatments, the spin-orbit coupling, \Delta_{SO}, is not assumed small compared to the Zeeman splitting, \Delta_Z. We demonstrate that ESR response diverges at the edges of the absorption spectrum for ac magnetic field perpendicular to the static field. At the compensation point, \Delta_{SO}\approx \Delta_Z, the broad absorption spectrum exhibits features that evolve with temperature, T, even when T is comparable to the Fermi energy.Comment: 11 pages, 6 figure

InSb/CdTe Heterostructures Grown by Molecular Beam Epitaxy

Given the potential for quantum effect device application, the growth, by molecular beam epitaxy, and characterization of InSb-CdTe heterostructures is described. Two procedures for growth of these heterostructures are employed. For the growth of InSb/CdTe double heterostructures, InSb and CdTe layers are grown in separate MBE growth chambers connected via an ultrahigh vacuum transfer module. Here, antimony originating from a compound InSb source oven is used for growth of InSb layers. For the growth of CdTe/InSb multiple quantum well structures, InSb and CdTe layers are grown in a single MBE growth chamber, where antimony is derived from an antimony cracking furnace. To study the optical nature of heteroepitaxially grown InSb, infrared photoluminescence from InSb based double heterostructures has been examined. Despite the transferral of grown layers between III-V and II-VI chambers, luminescence gathered from thick” InSb active layers has shown the existence of recombination features which are similar to bulk InSb. For multilayer structures, grown in a single chamber with the use of an antimony cracker, emphasis has been placed on structural examination by transmission electron microscopy and x-ray diffraction techniques. Examination of multilayer structures by transmission electron microscopy suggests tha t the cracker may be useful for the growth of InSb at low substrate temperatures and low growth rates. Using the cracker, CdTe/InSb superlattice structures have been grown showing multiple satellite peaks in the x-ray diffraction spectrum

First flea (Siphonaptera) records for Kanuti National Wildlife Refuge, Central Alaska

Kanuti National Wildlife Refuge (KNWR) was established in 1980 in Central Alaska. Collections of mammal fleas began in 1991. Six species resulted: Catallagia dacenkoi Ioff, Corrodopsylla curvata (Rothschild), Ctenophthalmus pseudagyrtes Baker, Megabothris calcarifer (Wagner), Amalaraeus dissimilis (Jordan) and Peromyscopsylla ostsibirica (Scalon). Ten species of fleas were previously recorded from the upper Koyukuk River watershed. One female specimen each of C. curvata and Ct. pseudagyrtes from the KNWR are the only new fleas added to the upper watershed list

First flea (Siphonaptera) records for Kanuti National Wildlife Refuge, Central Alaska

Kanuti National Wildlife Refuge (KNWR) was established in 1980 in Central Alaska. Collections of mammal fleas began in 1991. Six species resulted: Catallagia dacenkoi Ioff, Corrodopsylla curvata (Rothschild), Ctenophthalmus pseudagyrtes Baker, Megabothris calcarifer (Wagner), Amalaraeus dissimilis (Jordan) and Peromyscopsylla ostsibirica (Scalon). Ten species of fleas were previously recorded from the upper Koyukuk River watershed. One female specimen each of C. curvata and Ct. pseudagyrtes from the KNWR are the only new fleas added to the upper watershed list

Microgravity science at Langley Research Center

Although space research is still in an embryonic state, a combination of Earth based and space flight experiments are being coupled to yield a better understanding of the complex interaction of heat and fluid flow on the dynamics of crystal growth. Continued efforts on the ground as well as additional flight opportunities are needed to continue the drive to fully understand the advantages, both scientifically and economically, of microgravity crystal growth

Hearing the silences: adult Nigerian women’s accounts of ‘early marriages’

‘Early marriage’ is a relatively common, but under-researched global phenomenon, associated with poor health, mental health, educational and occupational outcomes, particularly for young girls. In this article, we draw on qualitative interviews with 6 Nigerian women from Sokoto State, who were married between the ages of 8 and 15. The interviews explored young women’s experiences of the transition to marriage, being married, pregnancy and their understanding of the marital and parental role. Using Interpretive Phenomenological Analysis, we explore women’s constrained articulations of their experiences of early marriage, as they are constituted within a social context where the identity of ‘woman’ is bound up in values and practices around marriage and motherhood. We explore the complexity of ‘hearing’ women’s experiences when their identities are bound up in culturally overdetermined ideas of femininity that function explicitly to silence and constrain the spaces in which women can speak