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Browsing Physics by Title
Now showing items 14-33 of 123
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Calibration and characterization of a highly efficient spectrometer in von Hamos geometry for 7-10 keV x-rays
(2017)We have built an absolutely calibrated, highly efficient, Bragg crystal spectrometer in von Hamos geometry. This zinc von Hamos spectrometer uses a crystal made from highly oriented pyrolytic graphite that is cylindrically ... -
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Charge-exchange x-ray spectra: Evidence for significant contributions from radiative decays of doubly excited states
(2016)Charge-exchange collisions of slow Ne10+ ions with He, Ne, and Ar targets were studied with simultaneous x-ray and cold-target recoil-ion-momentum spectroscopy proving the contribution of several mechanisms to the radiative ... -
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Coherence Preservation of a Single Neutral Atom Qubit Transferred between Magic-Intensity Optical Traps
(2016)We demonstrate that the coherence of a single mobile atomic qubit can be well preserved during a transfer process among different optical dipole traps (ODTs). This is a prerequisite step in realizing a large-scale neutral ... -
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Cold Anisotropically Interacting van der Waals Molecule: TiHe
(2017)We have used laser ablation and helium buffer-gas cooling to produce titanium-helium van der Waals molecules at cryogenic temperatures. The molecules were detected through laser-induced fluorescence spectroscopy. Ground-state ... -
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Cold collisions of heavy (2)Sigma molecules with alkali-metal atoms in a magnetic field: Ab initio analysis and prospects for sympathetic cooling of SrOH((2)Sigma(+)) by Li(S-2)
(2017)We use accurate ab initio and quantum scattering calculations to explore the prospects for sympathetic cooling of the heavy molecular radical SrOH((2)Sigma(+)) by ultracold Li atoms in a magnetic trap. Our ab initio ... -
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Collocated comparisons of continuous and filter-based PM2.5 measurements at Fort McMurray, Alberta, Canada
(2016)Collocated comparisons for three PM2.5 monitors were conducted from June 2011 to May 2013 at an air monitoring station in the residential area of Fort McMurray, Alberta, Canada, a city located in the Athabasca Oil Sands ... -
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Conditional summertime day-ahead solar irradiance forecast
(2018)We investigated the accuracy of numerical weather prediction (NWP)-based global horizontal irradiance (Gill) and clear-sky index forecasting over southern Nevada. Accurate forecasts of solar irradiance are required for ... -
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Cross sections for photoionization of fullerene molecular ions C-n(+) with n=40, 50, 70, 76, 78, and 84
(2017)Absolute cross-section measurements are reported for single photoionization of C-n(+) fullerene molecular ions (n = 40, 50, 70, 76, 78, and 84) in the photon-energy range 18-70 eV. The experiments were performed by merging ... -
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Dark matter scattering on electrons: Accurate calculations of atomic excitations and implications for the DAMA signal
(2016)We revisit the WIMP-type dark matter scattering on electrons that results in atomic ionization and can manifest itself in a variety of existing direct-detection experiments. Unlike the WIMP-nucleon scattering, where current ... -
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Decoupling Nonclassical Nonlinear Behavior of Elastic Wave Types
(2016)In this Letter, the tensorial nature of the nonequilibrium dynamics in nonlinear mesoscopic elastic materials is evidenced via multimode resonance experiments. In these experiments the dynamic response, including the spatial ... -
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Determination of plasma pinch time and effective current radius of double planar wire array implosions from current measurements on a 1-MA linear transformer driver
(2016)Implosions of planar wire arrays were performed on the Michigan Accelerator for Inductive Z-pinch Experiments, a linear transformer driver (LTD) at the University of Michigan. These experiments were characterized by lower ... -
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Developing and bounding ice particle mass- and area-dimension expressions for use in atmospheric models and remote sensing
(2016)Ice particle mass- and projected area-dimension (m-D and A-D) power laws are commonly used in the treatment of ice cloud microphysical and optical properties and the remote sensing of ice cloud properties. Although there ... -
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Development of 4.5 keV monochromatic X-ray radiography using the high-energy, picosecond LFEX laser
(2016)Development of a monochromatic x-ray imaging system using a high-energy short-pulse laser LFEX and a spherical crystal is reported. Irradiation of the intense short-pulse laser produces a flash of 4.51 keV Ti K-alpha x-ray ... -
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Development of a Multispectral Albedometer and Deployment on an Unmanned Aircraft for Evaluating Satellite Retrieved Surface Reflectance over Nevada's Black Rock Desert
(2018)Bright surfaces across the western U.S. lead to uncertainties in satellite derived aerosol optical depth (AOD) where AOD is typically overestimated. With this in mind, a compact and portable instrument was developed to ... -
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Development of Pm2.5 Source Impact Spatial Fields Using a Hybrid Source Apportionment Air Quality Model
(7/20/2015)An integral part of air quality management is knowledge of the impact of pollutant sources on ambient concentrations of particulate matter (PM). There is also a growing desire to directly use source impact estimates in ... -
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Dielectronic recombination of Zn-likeW(44+) from Cu-likeW(45+)
(2015)Energy levels, radiative transition probabilities, and autoionization rates for [Ar] 3d(10)4l'nl (n = 4- 12, l <= n - 1), [Ar]3d(10)5l'nl (n = 5-8, l <= n - 1), and [Ar]3d(9)4l'4l '' nl (n = 4-5, l <= n - 1) states in Zn- ... -
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Direct heating of compressed core by ultra-intense laser
(2016)We propose a new scheme for heating an imploded core in the fast-ignition scheme. In this method, a heating laser irradiates an imploded core plasma directly. The accelerated fast-ions as well as fast-electrons heat the ... -
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Distribution of rainfall intensity during the summer monsoon season over Kathmandu, Nepal
(2015)Over last 42 years, most of the rainfall during the summer monsoon season in theKathmandu Valley has ranged in intensity between 0.13 and 0.37mmh−1, based on the 24h accumulation measurement. We infer that this range ... -
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Dust Climatology of the NASA Dryden Flight Research Center (DFRC) in Lancaster, California, USA
(2017)A 15-year (1997-2011) climatology of dust events at the NASA DFRC in Lancaster, California, USA, was performed to evaluate how the extratropical systems were associated with dust storms over this region. For this study, ...