326 research outputs found

    Analyzing Fatal Bird-Window Collisions Occurring on USU\u27s C&SS Building, Brigham City, Utah

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    Fatal bird window collisions are often overlooked as minimally damaging to bird populations or viewed as inevitable collateral damage of human habitat expansion. In reality, these unnecessary collisions are truly monumental in number, and prove to be a serious threat to bird populations, especially endangered bird species. In the United States alone it is estimated that between 365 - 988 million birds fatally collide with man-made windows annually. We are focusing our study on fatal bird-window collisions occurring on the Classroom and Student Services Building (C&SS building) at the USU campus in Brigham City, UT 84302. We have selected this building as a potential location for a high frequency of bird-window collision for its inclusion of multiple large windows. Several studies have indicated that window area was positively correlated with the amount of window strikes. The objective of the study is to: Investigate the number of fatal bird window collisions that occur on the C&SS building, then determine if it is larger than the expected number of fatal window collisions per month for a low-rise non-residential building. The expected number is between 0 – 6 collisions per month. The objective will be accomplished through a two-step method. First, we will be analyzing data obtained through the conduction of daily surveys of the C&SS building during the months of August through November of 2020. The surveys will be conducted by ourselves and USU faculty. We will be looking for bird-window collision evidence. Finally, we will be collating our survey data with survey data obtained in the in the years 2017-2019.https://digitalcommons.usu.edu/fsrs2020/1039/thumbnail.jp

    Carl Bosch and the Haber-Bosch Process

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    This poster for the Natural Sciences Poster Session at Parkland College features organic chemist Carl Bosch, winner of the Nobel Prize of Chemistry in 1931 for his contribution to the development of chemical high pressure methods, Bosch built on Fritz Haber\u27s process of fixing nitrogen using high pressure chemistry to industrialize the process on a large scale to mass produce fertilizer, now known as the Haber-Bosch process, which takes nitrogen from the air, bonds it with hydrogen from natural gases and converts it to ammonia

    Building a Custom 4-Row Planter

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    This brief essay describes the processes taken to build a custom 4-row planter with the precision Agriculture Department and their company partner, Helena Chemical

    Strongly spin-polarized current generated in Zeeman-split unconventional superconductors

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    We consider a thin-film normal metal/superconductor junction in the presence of an externally applied in-plane magnetic field for several symmetries of the superconducting order parameter. For p-wave superconductors, a strongly spin-polarized current emerges due to an interplay between the nodal structure of the superconducting order parameter, the existence or non-existence of zero-energy surface states, and the Zeeman-splitting of the bands which form superconductivity. Thus, the polarization depends strongly on the orbital symmetry of the superconducting state. Our findings suggest a mechanism for obtaining fully spin-polarized currents crucially involving zero-energy surface states, not present in s-wave superconductors.Comment: 5 pages, 5 figures. Accepted for publication in Phys. Rev.

    The InfraRed Imaging Spectrograph (IRIS) for TMT: Reflective ruled diffraction grating performance testing and discussion

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    We present the efficiency of near-infrared reflective ruled diffraction gratings designed for the InfraRed Imaging Spectrograph (IRIS). IRIS is a first light, integral field spectrograph and imager for the Thirty Meter Telescope (TMT) and narrow field infrared adaptive optics system (NFIRAOS). We present our experimental setup and analysis of the efficiency of selected reflective diffraction gratings. These measurements are used as a comparison sample against selected candidate Volume Phase Holographic (VPH) gratings (see Chen et al., this conference). We investigate the efficiencies of five ruled gratings designed for IRIS from two separate vendors. Three of the gratings accept a bandpass of 1.19-1.37 {\mu}m (J band) with ideal spectral resolutions of R=4000 and R=8000, groove densities of 249 and 516 lines/mm, and blaze angles of 9.86 and 20.54 degrees, respectively. The other two gratings accept a bandpass of 1.51-1.82 {\mu}m (H Band) with an ideal spectral resolution of R=4000, groove density of 141 lines/mm, and blaze angle of 9.86{\deg}. We measure the efficiencies off blaze angle for all gratings and the efficiencies between the polarization transverse magnetic (TM) and transverse electric (TE) states. The peak reflective efficiencies are 98.90 +/- 3.36% (TM) and 84.99 +/- 2.74% (TM) for the H-band R=4000 and J-band R=4000 respectively. The peak reflective efficiency for the J-band R=8000 grating is 78.78 +/- 2.54% (TE). We find that these ruled gratings do not exhibit a wide dependency on incident angle within +/-3{\deg}. Our best-manufactured gratings were found to exhibit a dependency on the polarization state of the incident beam with a ~10-20% deviation, consistent with the theoretical efficiency predictions.Comment: Proceedings of the SPIE, 9147-34

    Charge relaxation resistance in the Coulomb blockade problem

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    We study the dissipation in a system consisting of a small metallic island coupled to a gate electrode and to a massive reservoir via single tunneling junction. The dissipation of energy is caused by a slowly oscillating gate voltage. We compute it in the regimes of weak and strong Coulomb blockade. We focus on the regime of not very low temperatures when electron coherence can be neglected but quantum fluctuations of charge are strong due to Coulomb interaction. The answers assume a particularly transparent form while expressed in terms of specially chosen physical observables. We discovered that the dissipation rate is given by a universal expression in both limiting cases.Comment: 21 pages, 12 figure

    Non-Fraunhofer Interference Pattern in Inhomogeneous Ferromagnetic Josephson Junctions

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    Generic conditions are established for producing a non-Fraunhofer response of the critical supercurrent subject to an external magnetic field in ferromagnetic Josephson junctions. Employing the quasiclassical Keldysh-Usadel method, we demonstrate theoretically that an inhomogeneity in the magnitude of the energy scales in the system, including Thouless energy, exchange field and temperature gradient normal to the transport direction, influences drastically the standard Fraunhofer pattern. The exotic non-Fraunhofer response, similar to that observed in recent experiments, is described in terms of an intricate interplay between multiple '0-pi'-states and is related to the appearance of proximity vortices.Comment: 5 pages, 3 figures. To Appear in Physical Review Letter

    Automated data processing architecture for the Gemini Planet Imager Exoplanet Survey

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    The Gemini Planet Imager Exoplanet Survey (GPIES) is a multi-year direct imaging survey of 600 stars to discover and characterize young Jovian exoplanets and their environments. We have developed an automated data architecture to process and index all data related to the survey uniformly. An automated and flexible data processing framework, which we term the Data Cruncher, combines multiple data reduction pipelines together to process all spectroscopic, polarimetric, and calibration data taken with GPIES. With no human intervention, fully reduced and calibrated data products are available less than an hour after the data are taken to expedite follow-up on potential objects of interest. The Data Cruncher can run on a supercomputer to reprocess all GPIES data in a single day as improvements are made to our data reduction pipelines. A backend MySQL database indexes all files, which are synced to the cloud, and a front-end web server allows for easy browsing of all files associated with GPIES. To help observers, quicklook displays show reduced data as they are processed in real-time, and chatbots on Slack post observing information as well as reduced data products. Together, the GPIES automated data processing architecture reduces our workload, provides real-time data reduction, optimizes our observing strategy, and maintains a homogeneously reduced dataset to study planet occurrence and instrument performance.Comment: 21 pages, 3 figures, accepted in JATI
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