Non-radial Oscillation Modes of Compact Stars with a Crust

Oscillation modes of isolated compact stars can, in principle, be a fingerprint of the equation of state (EoS) of dense matter. We study the non-radial high-frequency l=2 spheroidal modes of neutron stars and strange quark stars, adopting a two-component model (core and crust) for these two types of stars. Using perturbed fluid equations in the relativistic Cowling approximation, we explore the effect of a strangelet or hadronic crust on the oscillation modes of strange stars. The results differ from the case of neutron stars with a crust. In comparison to fluid-only configurations, we find that a solid crust on top of a neutron star increases the p-mode frequency slightly with little effect on the f-mode frequency, whereas for strange stars, a strangelet crust on top of a quark core significantly increases the f-mode frequency with little effect on the p-mode frequency.Comment: 10 pages, 6 figure

\u3ci\u3eAnaphes\u3c/i\u3e (Hymenoptera: Mymaridae) Reared from the Eggs of a Shore Fly (Diptera: Ephydridae)

Members of the family Mymaridae are obligate parasitoids of insect eggs, and some species attack the eggs of aquatic insects. Only one account of egg parasitism by the mymarid genus Anaphes on Diptera has been disclosed in the literature. Bakkendorf (1971) bred Anaphes autumnalis Foerster from an egg of Tipula autumnalis Loew

Kondo-Ising and Tight-Binding Models for TmB4

In $TmB_4$, localized electrons with a large magnetic moment interact with metallic electrons in boron-derived bands. We examine the nature of $TmB_4$ using full-relativistic ab-initio density functional theory calculations, approximate tight-binding Hamiltonian results, and the development of an effective Kondo-Ising model for this system. Features of the Fermi surface relating to the anisotropic conduction of charge are discussed. The observed magnetic moment $\sim 6 \, \mu_B$ is argued to require a subtle crystal field effect in metallic systems, involving a flipped sign of the effective charges surrounding a Tm ion. The role of on-site quantum dynamics in the resulting Kondo-Ising type "impurity" model are highlighted. From this model, elimination of the conduction electrons will lead to spin-spin (RKKY-type) interaction of Ising character required to understand the observed fractional magnetization plateaus in $TmB_4$

A Possible Case of Spatial Isolation in Brine Flies of the Genus \u3ci\u3eEphydra\u3c/i\u3e (Diptera: Ephydridae)

(excerpt) During the summer of 1975, adults and larvae of Ephydra riparia Fallen and E. cinerea Jones were encountered in the many brine pools occurring on the property of the Morton Salt Company at Rittman, Wayne County, Ohio (Scheiring and Foote, 1973). Larvae of both species have been reported to be salt tolerant (Bayly, 1972). E. ripariu larvae can survive in salinities up to 80°/oo (Sutcliffe, 1960), and the larvae of cinerea have been encountered by Nemenz (1960) in the Great Salt Lake of Utah at a salinity of 300°/oo

2006 NASA Range Safety Annual Report

Throughout 2006, Range Safety was involved in a number of exciting and challenging activities and events, from developing, implementing, and supporting Range Safety policies and procedures-such as the Space Shuttle Launch and Landing Plans, the Range Safety Variance Process, and the Expendable Launch Vehicle Safety Program procedures-to evaluating new technologies. Range Safety training development is almost complete with the last course scheduled to go on line in mid-2007. Range Safety representatives took part in a number of panels and councils, including the newly formed Launch Constellation Range Safety Panel, the Range Commanders Council and its subgroups, the Space Shuttle Range Safety Panel, and the unmanned aircraft systems working group. Space based range safety demonstration and certification (formerly STARS) and the autonomous flight safety system were successfully tested. The enhanced flight termination system will be tested in early 2007 and the joint advanced range safety system mission analysis software tool is nearing operational status. New technologies being evaluated included a processor for real-time compensation in long range imaging, automated range surveillance using radio interferometry, and a space based range command and telemetry processor. Next year holds great promise as we continue ensuring safety while pursuing our quest beyond the Moon to Mars

Neutron Correlations in the Decay of the First Excited State of 11Li

The decay of unbound excited 11Li was measured after being populated by a two-proton removal from a 13B beam at 71 MeV/nucleon. Decay energy spectra and Jacobi plots were obtained from measurements of the momentum vectors of the 9Li fragment and neutrons. A resonance at an excitation energy of ∼1.2 MeV was observed. The kinematics of the decay are equally well fit by a simple dineutron-like model or a phase-space model that includes final state interactions. A sequential decay model can be excluded

Understanding single-top-quark production and jets at hadron colliders

I present an analysis of fully differential single-top-quark production plus jets at next-to-leading order. I describe the effects of jet definitions, top-quark mass, and higher orders on the shapes and normalizations of the kinematic distributions, and quantify all theoretical uncertainties. I explain how to interpret next-to-leading-order jet calculations, and compare them to showering event generators. Using the program ZTOP, I show that HERWIG and PYTHIA significantly underestimate both s-channel and t-channel single-top-quark production, and propose a scheme to match the relevant samples to the next-to-leading-order predictions.Comment: 40 pgs., revtex4, 35 ps figs; added Fig. 4, 1 Ref., minor clarifications, to appear in Phys. Rev.

Asian gliriform origin for arctostylopid mammals

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Sierra Leone After the End of the Armed Conflict

Since March 1991, Sierra Leone has experienced continuous civil strife culminat­ing in a protracted civil war, leading to widespread destructions of infrastructures and property, and the death of thousands of people, many more injured and over half of the population displaced. Three peace accords were signed in 1996, 1997 and 1999 in Abidjan, Conakry and Lame respectively. However, these agreements did not bring peace. In this paper, the author situates the reasons and the nature of the conflict, the events leading to both government and rebel leaders declaring in January 2002 the end to conflict. Finally, he looks at Sierra Leone following the formal declaration of an end to the war.Desde Março de 1991, a Serra Leoa viveu uma experiencia de permanentes conflitos violentes envolvendo populações civil, experiência esta que desembocou numa verdadeira guerra civil, com a destruição em larga escala de infra-estruturas e propriedades, a morte de milhares de pessoas, um número muito maior de feridos, e mais de metade da população deslocada. Três acordos de paz foram assinados — em 1996 (Abidjan), 1997 (Conakry) e 1999 (Lame), respectivamente. Porém, nenhum deles trouxe a paz. No presente artigo, o autor localiza as razoes e a natureza do conflito, e os acontecimentos que levaram o governo e os líderes rebeldes a declarar o conflito terminado, em Janeiro de 2002. Na parte final analisa a situação Serra Leoa desta «declaração de fim de guerra».Dès mars 1991, la Sierra Leone a vécu une expérience de continuels conflits violents qui impliquaient des populations civiles. Cette expérience a débouché sur une vraie guerre civile, avec destruction à grande échelle d'infrastructures et propriétés, la mort de milliers de personnes, un nombre encore plus grand de blessés, et plus de moitié de la population déplacée. Trois accords de paix ont été signés — en 1996 (Abidjan), 1997 (Conakry)et 1999 (Lame), respectivement. Cependant, aucun d'entre eux n'a produit la paix. Dans l'article qui suit, l'auteur localise les raisons et la nature du conflit ainsi que les évènements que ont conduit le gouvernement et les chefs rebelles a déclarer le conflit comme terminé, en janvier 2002. Dans la parte finale il analyse les résultats de cette « déclaration de fin de guerre » en Sierra Léone