g-Factor anisotropy of hole quantum wires induced by the Rashba interaction

We present calculations of the g factors for the lower conductance steps of 3D hole quantum wires. Our results prove that the anisotropy with magnetic field orientation, relative to the wire, originates in the Rashba spin-orbit coupling. We also analyze the relevance of the deformation, as the wire evolves from 3D towards a flat 2D geometry. For high enough wire deformations, the perpendicular g factors are greatly quenched by the Rashba interaction. On the contrary, parallel g factors are rather insensistive to the Rashba interaction, resulting in a high g factor anisotropy. For low deformations we find a more irregular behavior which hints at a sample dependent scenario.Comment: 7 pages, 6 figures (expanded from previous version

Review of the West Indian species of Efferia Coquillett (Diptera: Asilidae): Part 1. Bahamas, Cayman Islands, Cuba, and Jamaica

The genus Efferia Coquillett from the Bahamas, Cayman Islands, Cuba, and Jamaica is reviewed. The fauna now totals 16 species with 6 new species described (Ef. bellardii n. sp., Ef. bromleyi n. sp., Ef. hinei n. sp., Ef. insula n. sp., Ef. pina n. sp., and Ef. vinalensis n. sp.). Cuba has the greatest diversity with 10 species, Jamaica 3, the Bahamas 2, and the Cayman Islands 1. Efferia stylata (Fabricius) is removed from the species list of these West Indian islands. The wings of Ef. caymanensis Scarbrough and Ef. bromleyi, spermathecae of Ef. bromleyi, Ef. cubensis (Bromley), Ef. insula, Ef. nigritarsis (Hine), and terminalia of all species are illustrated. Keys for the identification of the species are provided. Specimens of two additional species from Cuba are in too poor a condition to be described but their terminalia are illustrated and the species are included in the key to the males

A summary of the endemic beetle genera of the West Indies (Insecta: Coleoptera); bioindicators of the evolutionary richness of this Neotropical archipelago

The Caribbean Islands (or the West Indies) are recognized as one of the leading global biodiversity hot spots. This is based on data on species, genus, and family diversity for vascular plants and non-marine vertebrates. This paper presents data on genus level endemicity for the most speciose (but less well publicised) group of terrestrial animals: the beetles, with 205 genera (in 25 families) now recognized as being endemic (restricted) to the West Indies. The predominant families with endemic genera are Cerambycidae (41), Chrysomelidae (28), Curculionidae (26), and Staphylinidae (25). This high level of beetle generic endemicity can be extrapolated to suggest that a total of about 700 genera of all insects could be endemic to the West Indies. This far surpasses the total of 269 endemic genera of all plants and non-marine vertebrates, and reinforces the biodiversity richness of the insect fauna of the West Indies.Las islas del Caribe (o Indias Occidentales) son reconocidas como uno de los principales hotspots de la biodiversidad global. Esto se basa en datos sobre la diversidad de especies, géneros y familias de plantas vasculares y vertebrados no-marinos. Este trabajo presenta datos sobre la endemicidad a nivel genérico para el más especioso (pero menos popularizado) grupo de animales terrestres: los escarabajos, con 205 géneros (en 25 familias) reconocidos al presente como endémicos (restringidos) a las Indias Occidentales. Las familias predominantes en géneros endémicos son Cerambycidae (41), Chrysomelidae (28), Curculionidae (26) y Staphylinidae (25). Este alto nivel de endemicidad genérica en los escarabajos puede extrapolarse a sugerir que alrededor de 700 géneros pudieran ser endémicos entre todos los insectos de las Indias Occidentales. Esto sobrepasa ampliamente el total de 269 géneros endémicos de plantas y vertebrados no-marinos y refuerza la riqueza en biodiversidad de la fauna de insectos en las Indias Occidentales

Interview with Maria Gelabert

This interview was conducted for the as part of the 20th Anniversary of the September 11th Terrorist Attacks on the United States. This effort was to produce a history of the university’s, as well as the community’s, response in the days and weeks following the attacks. A key aspect of the project was a series of audio-taped interviews conducted with various members of the Rock Hill and Winthrop communities who felt their stories needed to be shared. This interview is of Dr. Maria Gelabert, Professor of Chemistry at Winthrop University. In her interview with Andrew Russell, Dr. Gelabert discusses her memories and thoughts of the September 11, 2001 terrorist attacks. Dr. Gelabert describes her experience during the events and the devastation that resulted from them while living in New Jersey and working at Wagner College on Staten Island.https://digitalcommons.winthrop.edu/oralhistoryprogram/1604/thumbnail.jp

Multichannel effects in Rashba quantum wires

We investigate intersubband mixing effects in multichannel quantum wires in the presence of Rashba spin-orbit coupling and attached to two terminals. When the contacts are ferromagnetic and their magnetization direction is perpendicular to the Rashba field, the spin-transistor current is expected to depend in a oscillatory way on the Rashba coupling strength due to spin coherent oscillations of the travelling electrons. Nevertheless, we find that the presence of many propagating modes strongly influences the spin precession effect, leading to (i) a quenching of the oscillations and (ii) strongly irregular curves for high values of the Rashba coupling. We also observe that in the case of leads' magnetization parallel to the Rashba field, the conductance departs from a uniform value as the Rashba strength increases. We also discuss the Rashba interaction induced current polarization effects when the contacts are not magnetic and investigate how this mechanism is affected by the presence of several propagating channels.Comment: 8 pages, 7 figure

Community Lutheran Church

Community Lutheran battled food insecurities by holding weekly afterschool programs to pass out food to underprivileged children, held festivals with free food and community outreach to bring those in need towards the church, and a monthly “Feel Good Fridays” to give back to the community and those in need.https://digitalscholarship.unlv.edu/educ_sys_202/1035/thumbnail.jp

Interview with Maria Gelabert

In her interview with Andrew Russell, Maria Gelabert discusses her experience during the September 11, 2001 attacks. Ms. Gelabert details her experience living and working in New York City both on that day and the period following. She discusses the City’s immediate response to the terrorist attacks as well as the effect these events had on the citizens

Reflejo de la vendimia y aplicaciones derivadas en los textos clásicos, en los mosaicos de Hispania y África y en sarcófagos romanos

Los mosaicos y los relieves de los sarc6fagos producidos en el seno de la civilización romana aportan, a través de sus motivos figurados, una ingente cantidad de información para el historiador, tanto de la vida cotidiana como del ambiente ideológico, religioso y simbólico. En el estudio presente abordamos una actividad agrícola, la vendimia, examinada como hecho real, a pesar de que en gran número de los monumentos que trataremos adquiere unas dimensiones que trascienden la realidad campesina.The mosaics and the sarcophagi reliefs produced at the heart of the Roman civilisation provide, through their ornamental motifs, an enormous quantity of information to the historian about daily Iife as well as the ideological, religious, and symbological environment. In the present study we embrace an agricultural activity, grape harvest, examined as a true fact, even though in a great number of monuments we will deal with it acquires dimensions that transcend farming reality