Now showing items 21-40 of 81943

    • Boresight Calibration

      OSIRIS-REx Asteroid Sample Return Mission (2015)
    • Linguistic Change and the Future of Metrical Persian Poetry

      Mahdavi Mazdeh, Mohsen; Univ Arizona, Dept Linguist (Informa UK Limited, 2020-08-25)
      The metrical requirements of Persian poetry are highly restrictive. Traditionally, the rigidity of the metrical system was compensated for by a high degree of flexibility in the poetic language in terms of lexicon, phonology, and morpho-syntax. Using statistical data from different periods of Persian poetry, this paper argues that the degree of flexibility of the language used in metrical Persian poetry has been in constant decrease, moving towards what may potentially be a language crisis for metrical Persian poetry. This study traces the linguistic and meta-linguistic origins of the initial flexibility of the poetic language and its subsequent change, suggesting that some of the recent trends in Persian poetry may be viewed in part as reactions to this potential crisis.
    • Bennu Key Parameter Values

      OSIRIS-REx Asteroid Sample Return Mission (2020)
    • Bennu Data in ArcMap Verification Checklist

      OSIRIS-REx Asteroid Sample Return Mission (2019)
    • Avoiding Tall Particles (RDWG code/analysis)

      OSIRIS-REx Asteroid Sample Return Mission (2015)
    • Quantum-optimal detection of one-versus-two incoherent optical sources with arbitrary separation

      Lu, Xiao-Ming; Krovi, Hari; Nair, Ranjith; Guha, Saikat; Shapiro, Jeffrey H.; Univ Arizona, Coll Opt Sci (SPRINGERNATURE, 2018-12-07)
      We analyze the fundamental quantum limit of the resolution of an optical imaging system from the perspective of the detection problem of deciding whether the optical field in the image plane is generated by one incoherent on-axis source with brightness. or by two epsilon/2-brightness incoherent sources that are symmetrically disposed about the optical axis. Using the exact thermal-state model of the field, we derive the quantum Chernoff bound for the detection problem, which specifies the optimum rate of decay of the error probability with increasing number of collected photons that is allowed by quantum mechanics. We then show that recently proposed linear-optic schemes approach the quantum Chernoff bound-the method of binary spatial-mode demultiplexing (B-SPADE) is quantum-optimal for all values of separation, while a method using image inversion interferometry (SLIVER) is near-optimal for sub-Rayleigh separations. We then simplify our model using a low-brightness approximation that is very accurate for optical microscopy and astronomy, derive quantum Chernoff bounds conditional on the number of photons detected, and show the optimality of our schemes in this conditional detection paradigm. For comparison, we analytically demonstrate the superior scaling of the Chernoff bound for our schemes with source separation relative to that of spatially resolved direct imaging. Our schemes have the advantages over the quantum-optimal (Helstrom) measurement in that they do not involve joint measurements over multiple modes, and that they do not require the angular separation for the two-source hypothesis to be given a priori and can offer that information as a bonus in the event of a successful detection.
    • The Origins Space Telescope: mission concept overview

      Leisawitz, David T.; Amatucci, Edward G.; Carter, Ruth C.; DiPirro, Michael J.; Flores, Anel; Staguhn, Johannes G.; Wu, Chi; Allen, Lynn; Arenberg, Jonathan; Armus, Lee; et al. (SPIE-INT SOC OPTICAL ENGINEERING, 2018-07-24)
      The Origins Space Telescope (OST) will trace the history of our origins from the time dust and heavy elements permanently altered the cosmic landscape to present-day life. How did the universe evolve in response to its changing ingredients? How common are life-bearing planets? To accomplish its scientific objectives, OST will operate at mid-and far-infrared wavelengths and offer superlative sensitivity and new spectroscopic capabilities. The OST study team will present a scientifically compelling, executable mission concept to the 2020 Decadal Survey in Astrophysics. To understand the concept solution space, our team studied two alternative mission concepts. We report on the study approach and describe both of these concepts, give the rationale for major design decisions, and briefly describe the mission-enabling technology.
    • The impact of state laws on motor vehicle fatality rates, 1999-2015

      Notrica, David M; Sayrs, Lois W; Krishna, Nidhi; Rowe, Dorothy; Jaroszewski, Dawn E; McMahon, Lisa E; Univ Arizona, Coll Med Phoenix (LIPPINCOTT WILLIAMS & WILKINS, 2020-06)
      BACKGROUND Motor vehicle crash (MVC) fatalities have been declining while states passed various legislation targeting driver behaviors. This study assesses the impact of state laws on MVC fatality rates to determine which laws were effective. METHODS Publically available data were collected on driver-related motor vehicle laws, law strengths, enactment years, and numbers of verified-trauma centers. Prospective data on crash characteristics and MVC fatalities 16 years or older from Fatality Analysis Reporting System 1999 to 2015 (n = 850) were obtained. Generalize Linear Autoregressive Modeling was used to assess the relative contribution of state laws to the crude MVC fatality rate while controlling for other factors. RESULTS Lowering the minimum blood alcohol content (BAC) was associated with largest declines for all ages, especially the older cohorts: 16 years to 20 years (B= 0.23;p< 0.001), 21 years to 55 years (B= 1.7;p< 0.001); 56 years to 65 years (B= 3.2;p< 0.001); older than 65 years (B= 4.1;p< 0.001). Other driving under the influence laws were also significant. Per se BAC laws accompanying a reduced BAC further contributed to declines in crude fatality rates: 21 years to 55 years (B = -0.13;p< 0.001); older than 65 years (B= -0.17;p< 0.05). Driving under the influence laws enhancing the penalties, making revocation automatic, or targeting social hosts had mixed effects by age. Increased enforcement, mandatory education, vehicle impoundment, interlock devices, and underage alcohol laws showed no association with declining mortality rates. Red light camera and seatbelt laws were associated with declines in mortality rates for all ages except for older than 65 years cohort, but speed camera laws had no effect. Graduated Driver License laws were associated with declines for 16 years to 21 years (B= -0.06;p< 0.001) only. Laws targeting specific risks (elderly, motorcycles, marijuana) showed no effect on declining MVC mortality rates during the study period. CONCLUSION States have passed a wide variety of laws with varying effectiveness. A few key laws, specifically laws lowering allowable BAC, implementing red light cameras, and mandating seatbelt use significantly reduced MVC mortality rates from 1999 to 2015. Simply adding more laws/penalties may not equate directly to lives saved. Continued research on state laws will better inform policy makers to meet evolving public health needs in the management of MVC fatalities.
    • Automated Feature Description

      OSIRIS-REx Asteroid Sample Return Mission (2015)
    • SAWG (Vicky Hamilton) Meeting Notes August 24-26

      OSIRIS-REx Asteroid Sample Return Mission (2015)
    • Astrometry and Photometry Product Description

      OSIRIS-REx Asteroid Sample Return Mission (2013)
    • Asteriod Spectral Modeling

      OSIRIS-REx Asteroid Sample Return Mission (2019)
    • ArcScene Import for DTMs

      OSIRIS-REx Asteroid Sample Return Mission (2019)
    • APWG Meeting, Dec 9th 2015 Tucson

      OSIRIS-REx Asteroid Sample Return Mission (2015)
    • AltWG/OLA Meeting and Training, Sep 5-9, 2017

      OSIRIS-REx Asteroid Sample Return Mission (2017)
    • Medical Overtesting and Racial Distrust

      Golemon, Luke; Univ Arizona, Dept Philosophy (Johns Hopkins University Press, 2019-09)
      The phenomenon of medical overtesting in general, and specifically in the emergency room, is well known and regarded as harmful to both the patient and the healthcare system. Although the implications of this problem raise myriad ethical concerns, this paper explores the extent to which overtesting might mitigate race-based health inequalities. Given that medical malpractice and error greatly increase when the patients belong to a racial minority, it is no surprise that the mortality rate similarly increases in proportion to white patients. For these populations, an environment that emphasizes medical overtesting may well be the desirable medical environment until care evens out among races and ethnicities; additionally, efforts to lower overtesting in conjunction with a high rate of racist medical mythology may cause harm by lowering testing when it is actually warranted. Furthermore, medical overtesting may help to assuage racial distrust. This paper ultimately concludes that an environment of medical overtesting may be less pernicious than the alternative.
    • Rural Bioethics: The Alaska Context

      Allhoff, Fritz; Golemon, Luke; Univ Arizona, Dept Philosophy (Springer, 2019-10-11)
      With by far the lowest population density in the United States, myriad challenges attach to healthcare delivery in Alaska. In the “Size, Population, and (In)Accessibility” section, we characterize this geographic context, including how it is exacerbated by lack of infrastructure. In the “Distributing Healthcare” section, we turn to healthcare economics and staffing, showing how these bear on delivery—and are exacerbated by geography. In the “Health Care in Rural Alaska” section, we turn to rural care, exploring in more depth what healthcare delivery looks like outside of Alaska’s major cities. This discussion continues in the “Alaska’s Native Villages” section, which specifically analyzes healthcare in Alaska’s indigenous villages, some of the smallest and most isolated communities in the United States. Though many of the ways we could improve Alaskan health care for Alaskan residents are limited by its unique features, the “Justice and Healthcare Delivery” and “Technology and Telemedicine” sections consider ways in which certain policies and technology—including telemedicine—could mitigate the challenges developed in previous sections.
    • 2018 Interview with William Mackenzie

      Carnie, Andrew; Clayton, Ian; University of Arizona; University of Nevada, Reno; Ó Broin, Àdhamh; Mackenzie, William (2020)
    • 2018 Interview with Murdo Alec Mackenzie

      Carnie, Andrew; Clayton, Ian; University of Arizona; University of Nevada, Reno; Ó Broin, Àdhamh; Mackenzie, Murdo Alec (2020)