6,321 research outputs found

    Description of a new Crossidius LeConte (Coleoptera: Cerambycidae: Cerambycinae: Trachyderini) from southern Georgia with comments on its biology and unusual distribution

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    Crossidius grahami Morris and Wappes new species (Coleoptera: Cerambycidae) is described from the Ohoopee Dunes of southern Georgia. Comments are included on the new species’ biology and disjunct distribution compared to other species of Crossidius LeConte. Illustrations include: dorsal and lateral views of the primary types of C. grahami, its natural habitat, the known host plant (Chrysoma pauciflosculosa (Michx.) Greene (Asteraceae)), pupal chamber, and dorsal views of both sexes of Crossidius humeralis quadrivittata Penrose, 1974, considered its closest anatomical counterpart and nearest geographical relative

    A Quantitative Methodology for Vetting Dark Network Intelligence Sources for Social Network Analysis

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    Social network analysis (SNA) is used by the DoD to describe and analyze social networks, leading to recommendations for operational decisions. However, social network models are constructed from various information sources of indeterminate reliability. Inclusion of unreliable information can lead to incorrect models resulting in flawed analysis and decisions. This research develops a methodology to assist the analyst by quantitatively identifying and categorizing information sources so that determinations on including or excluding provided data can be made. This research pursued three main thrusts. It consolidated binary similarity measures to determine social network information sources\u27 concordance and developed a methodology to select suitable measures dependent upon application considerations. A methodology was developed to assess the validity of individual sources of social network data. This methodology utilized source pairwise comparisons to measure information sources\u27 concordance and a weighting schema to account for sources\u27 unique perspectives of the underlying social network. Finally, the developed methodology was tested over a variety of generated networks with varying parameters in a design of experiments paradigm (DOE). Various factors relevant to conditions faced by SNA analysts potentially employing this methodology were examined. The DOE was comprised of a 24 full factorial design augmented with a nearly orthogonal Latin hypercube. A linear model was constructed using quantile regression to mitigate the non-normality of the error terms

    Fatigue testing a plurality of test specimens and method

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    Described is a fatigue testing apparatus for simultaneously subjecting a plurality of material test specimens to cyclical tension loading to determine the fatigue strength of the material. The fatigue testing apparatus includes a pulling head having cylinders defined therein which carry reciprocating pistons. The reciprocation of the pistons is determined by cyclical supplies of pressurized fluid to the cylinders. Piston rods extend from the pistons through the pulling head and are attachable to one end of the test specimens, the other end of the test specimens being attachable to a fixed base, causing test specimens attached between the piston rods and the base to be subjected to cyclical tension loading. Because all the cylinders share a common pressurized fluid supply, the breaking of a test specimen does not substantially affect the pressure of the fluid supplied to the other cylinders nor the tension applied to the other test specimens

    Color infrared photography and thermal infrared imagery of selected locations along the Missouri River between Omaha and Blair, Nebraska

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    CER71-72MMS-JFR 49.June, 1972.Submitted to Department of the Army Omaha District, Corps of Engineers Omaha, Nebraska.Circulating copy deaccessioned 2020

    Description of a new \u3ci\u3eCrossidius\u3c/i\u3e LeConte (Coleoptera: Cerambycidae: Cerambycinae: Trachyderini) from southern Georgia with comments on its biology and unusual distribution

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    Abstract. Crossidius grahami Morris and Wappes new species (Coleoptera: Cerambycidae) is described from the Ohoopee Dunes of southern Georgia. Comments are included on the new species’ biology and disjunct distribution compared to other species of Crossidius LeConte. Illustrations include: dorsal and lateral views of the primary types of C. grahami, its natural habitat, the known host plant (Chrysoma pauciflosculosa (Michx.) Greene (Asteraceae)), pupal chamber, and dorsal views of both sexes of Crossidius humeralis quadrivittata Penrose, 1974, considered its closest anatomical counterpart and nearest geographical relative. Resumen. Se describe Crossidius grahami Morris and Wappes, especie nueve (Coleoptera: Cerambycidae) de la Dunas Ohoopee del sur de Georgia. Se incluyen comentarios sobre la biología de la nueva especie y sobre su distribución dispersa en comparación con las otras especies de Crossidius LeConte

    Glycolysis in the African Trypanosome: Targeting Enzymes and Their Subcellular Compartments for Therapeutic Development

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    Subspecies of the African trypanosome, Trypanosoma brucei, which cause human African trypanosomiasis, are transmitted by the tsetse fly, with transmission-essential lifecycle stages occurring in both the insect vector and human host. During infection of the human host, the parasite is limited to using glycolysis of host sugar for ATP production. This dependence on glucose breakdown presents a series of targets for potential therapeutic development, many of which have been explored and validated as therapeutic targets experimentally. These include enzymes directly involved in glucose metabolism (e.g., the trypanosome hexokinases), as well as cellular components required for development and maintenance of the essential subcellular compartments that house the major part of the pathway, the glycosomes

    Transmission measurements (4000-400 cm(exp -1), 2.5-25 microns) of crystalline ferric oxides and ferric oxyhydroxides: Implications for Mars

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    Transmission spectra of three ferric oxides (two alpha-Fe2O3 samples and one gamma-Fe2O3 sample) and two ferric oxyhydroxides (alpha-FeOOH and gamma-FeOOH) were measured. This preliminary study has demonstrated that crystalline ferric oxides and ferric oxyhydroxides exhibit complex spectral features at thermal wavelengths. Some of these features suggest that thermal infrared observations of Mars can provide significant insight into the ferric mineralogy of that planet. The results of this study suggest that emissivity spectra of crystalline ferric oxides and ferric oxyhydroxides may prove quite important for the interpretation of thermal infrared spectral observations of Mars
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