University of Oklahoma

About: University of Oklahoma is a education organization based out in Norman, Oklahoma, United States. It is known for research contribution in the topics: Population & Radar. The organization has 25269 authors who have published 52609 publications receiving 1821706 citations. The organization is also known as: OU & Oklahoma University.

A note on the judgmental effects of the balanced scorecard's information organization

Abstract: We examine judgmental effects of the balanced scorecard’s organization. The balanced scorecard contains a large number of performance measures divided into four categories. We examine whether the scorecard’s organization results in managerial performance evaluation judgments consistent with a recognition of the potential relations (i.e. nonindependence) of measures within a category. Supporting this idea, we find that performance evaluations are affected by organizing the measures into the balanced scorecard categories when multiple below-target (or above-target) measures are contained within a category but that evaluations are not affected when the above/below-target measures are distributed across the scorecard’s four categories. # 2002 Elsevier Science Ltd. All rights reserved.

Simplified Models for Dark Matter Searches at the LHC

Abstract: This document outlines a set of simplified models for dark matter and its interactions with Standard Model particles. It is intended to summarize the main characteristics that these simplified models have when applied to dark matter searches at the LHC, and to provide a number of useful expressions for reference. The list of models includes both s-channel and t-channel scenarios. For s-channel, spin-0 and spin-1 mediation is discussed, and also realizations where the Higgs particle provides a portal between the dark and visible sectors. The guiding principles underpinning the proposed simplified models are spelled out, and some suggestions for implementation are presented.

Interaction of P-selectin and PSGL-1 generates microparticles that correct hemostasis in a mouse model of hemophilia A.

Abstract: High plasma levels of soluble P-selectin are associated with thrombotic disorders and may predict future cardiovascular events. Mice with high levels of soluble P-selectin have more microparticles in their plasma than do normal mice. Here we show that chimeras of P-selectin and immunoglobulin (P-sel–Ig) induced formation of procoagulant microparticles in human blood through P-selectin glycoprotein ligand-1 (PSGL-1; encoded by the Psgl1 gene, officially known as Selpl). In addition, Psgl1−/− mice produced fewer microparticles after P-sel–Ig infusion and did not spontaneously increase their microparticle count in old age as do wild-type mice. Injected microparticles specifically bound to thrombi and thus could be involved in thrombin generation at sites of injury. Infusion of P-sel–Ig into hemophilia A mice produced a 20-fold increase over control immunoglobulin in microparticles containing tissue factor. This significantly improved the kinetics of fibrin formation in the hemophilia A mice and normalized their tail-bleeding time. P-sel–Ig treatment could become a new approach to sustained control of bleeding in hemophilia.

Jet energy measurement and its systematic uncertainty in proton-proton collisions at s√=7 TeV with the ATLAS detector

Abstract: The jet energy scale (JES) and its systematic uncertainty are determined for jets measured with the ATLAS detector using proton-proton collision data with a centre-of-mass energy of [Formula: see text] TeV corresponding to an integrated luminosity of [Formula: see text][Formula: see text]. Jets are reconstructed from energy deposits forming topological clusters of calorimeter cells using the anti-[Formula: see text] algorithm with distance parameters [Formula: see text] or [Formula: see text], and are calibrated using MC simulations. A residual JES correction is applied to account for differences between data and MC simulations. This correction and its systematic uncertainty are estimated using a combination of in situ techniques exploiting the transverse momentum balance between a jet and a reference object such as a photon or a [Formula: see text] boson, for [Formula: see text] and pseudorapidities [Formula: see text]. The effect of multiple proton-proton interactions is corrected for, and an uncertainty is evaluated using in situ techniques. The smallest JES uncertainty of less than 1 % is found in the central calorimeter region ([Formula: see text]) for jets with [Formula: see text]. For central jets at lower [Formula: see text], the uncertainty is about 3 %. A consistent JES estimate is found using measurements of the calorimeter response of single hadrons in proton-proton collisions and test-beam data, which also provide the estimate for [Formula: see text] TeV. The calibration of forward jets is derived from dijet [Formula: see text] balance measurements. The resulting uncertainty reaches its largest value of 6 % for low-[Formula: see text] jets at [Formula: see text]. Additional JES uncertainties due to specific event topologies, such as close-by jets or selections of event samples with an enhanced content of jets originating from light quarks or gluons, are also discussed. The magnitude of these uncertainties depends on the event sample used in a given physics analysis, but typically amounts to 0.5-3 %.

The r-Process-enriched Low-Metallicity Giant HD?115444

Abstract: New high-resolution, very high signal-to-noise spectra of ultra-metal-poor (UMP) giant stars HD 115444 and HD 122563 have been gathered with the High-Resolution Echelle Spectrometer of the McDonald Observatory 2.7 m telescope. With these spectra, line identification and model atmosphere analyses have been conducted, emphasizing the neutron-capture elements. Twenty elements with Z > 30 have been identified in the spectrum of HD 115444. This star is known to have overabundances of the neutron-capture elements, but it has lacked a detailed analysis necessary to compare with nucleosynthesis predictions. The new study features a line-by-line differential abundance comparison of HD 115444 with the bright, well-studied halo giant HD 122563. For HD 115444, the overall metallicity is [Fe/H] -3.0. The abundances of the light and iron-peak elements generally show the same pattern as other UMP stars (e.g., overdeficiencies of manganese and chromium, overabundances of cobalt), but the differential analysis indicates several nucleosynthesis signatures that are unique to each star. Synthetic spectrum analyses reveal substantial overabundances of the heavier neutron-capture elements (Z ≥ 56; elements barium and beyond) in HD 115444. Thus with [Eu/Fe] +0.9, for example, HD 115444 is a moderate version of the extremely neutron-capture-rich UMP giant CS 22892-052 ([Fe/H] -3.1, [Eu/Fe] +1.7). The abundance pattern of the heavier neutron-capture elements is consistent with scaled solar system r-process-only abundances (with little contribution from the s-process). In HD 115444, [Ba/Eu] = -0.73, while in CS 22892-052 this ratio is -0.79. Thus HD 115444 becomes the second UMP r-process-rich halo giant unambiguously identified from a very detailed abundance analysis. Abundances of the lighter neutron-capture elements strontium, yttrium, and zirconium are, however, nearly identical in HD 115444 and HD 122563. Along with the heavier neutron-capture elements, the 4019 A line of Th II has been detected in HD 115444, yielding log e(Th) = -2.23 ± 0.07. Comparing the observed thorium abundance in HD 115444, along with CS 22892-052, with other theoretical estimates of the time-zero abundance suggests an age for both of these UMP stars of 15.6 ± 4 Gyr, consistent with previous radioactive age estimates for CS 22892-052 and other Galactic and cosmological age determinations.