Now showing items 5104-5118 of 5118

    • X-Ray and Radio Observations of the Magnetar SGR J1935+2154 during Its 2014, 2015, and 2016 Outbursts 

      Younes, George; Kouveliotou, Chryssa; Jaodand, Amruta; Baring, Matthew G.; van der Horst, Alexander J.; (2017)
      We analyzed broadband X-ray and radio data of the magnetar SGR J1935+2154 taken in the aftermath of its 2014, 2015, and 2016 outbursts. The source soft X-ray spectrum <10 keV is well described with a blackbody+power-law (BB+PL) or 2BB model during all three outbursts. Nuclear Spectroscopic Telescope Array observations revealed a hard X-ray tail, with ...
    • X-Ray Burst and Persistent Emission Properties of the Magnetar SGR 1830-0645 in Outburst 

      Younes, George; Hu, Chin-Ping; Bansal, Karishma; Ray, Paul S.; Pearlman, Aaron B.; (2022)
      We report on NICER X-ray monitoring of the magnetar SGR 1830−0645 covering 223 days following its 2020 October outburst, as well as Chandra and radio observations. We present the most accurate spin ephemerides of the source so far: ν = 0.096008680(2) Hz, Hz s−1, and significant second and third frequency derivative terms indicative of nonnegligible ...
    • X-ray laser implementation by means of a strong source of high-spin metastable atoms 

      Helman, J.S.; Rau, C.; Bunge, C.F. (1983)
      High-spin metastable atomic beams of high density and extremely small divergence can be produced by electron capture during grazing-angle scattering of ion beams at ferromagnetic surfaces. This can be used to generate a long-lived reservoir of Li 1s2s2p P5204 with enough density of metastables so that after laser-induced transfer to Li 1s2p2P2 strong ...
    • X-Ray through Very High Energy Intrabinary Shock Emission from Black Widows and Redbacks 

      van der Merwe, C.J.T.; Wadiasingh, Z.; Venter, C.; Harding, A.K.; Baring, M.G. (2020)
      Black widow and redback systems are compact binaries in which a millisecond pulsar heats and may even ablate its low-mass companion by its intense wind of relativistic particles and radiation. In such systems, an intrabinary shock can form as a site of particle acceleration and associated nonthermal emission. We model the X-ray and gamma-ray synchrotron ...
    • XENON1T dark matter data analysis: Signal reconstruction, calibration, and event selection 

      XENON Collaboration (2019)
      The XENON1T experiment at the Laboratori Nazionali del Gran Sasso is the most sensitive direct detection experiment for dark matter in the form of weakly interacting particles (WIMPs) with masses above 6  GeV/c2 scattering off nuclei. The detector employs a dual-phase time projection chamber with 2.0 metric tons of liquid xenon in the target. A ...
    • XMRF: an R package to fit Markov Networks to high-throughput genetics data 

      Wan, Ying-Wooi; Allen, Genevera I; Baker, Yulia; Yang, Eunho; Ravikumar, Pradeep; (2016)
      Abstract Background Technological advances in medicine have led to a rapid proliferation of high-throughput “omics” data. Tools to mine this data and discover disrupted disease networks are needed as they hold the key to understanding complicated interactions between genes, mutations and aberrations, ...
    • XTH31, Encoding an in Vitro XEH/XET-Active Enzyme, Regulates Aluminum Sensitivity by Modulating in Vivo XET Action, Cell Wall Xyloglucan Content, and Aluminum Binding Capacity in Arabidopsis 

      Zhu, Xiao Fang; Shi, Yuan Zhi; Lei, Gui Jie; Fry, Stephen C.; Zhang, Bao Cai; (2012-11)
      Xyloglucan endohydrolase (XEH) and xyloglucan endotransglucosylase (XET) activities, encoded by xyloglucan endotransglucosylase-hydrolase (XTH) genes, are involved in cell wall extension by cutting or cutting and rejoining xyloglucan chains, respectively. However, the physiological significance of this biochemical activity remains incompletely ...
    • Xyloglucan Endotransglucosylase-Hydrolase17 Interacts with Xyloglucan Endotransglucosylase-Hydrolase31 to Confer Xyloglucan Endotransglucosylase Action and Affect Aluminum Sensitivity in Arabidopsis 

      Zhu, Xiao Fang; Wan, Jiang Xue; Sun, Ying; Shi, Yuan Zhi; Braam, Janet; (2014)
      Previously, we reported that although the Arabidopsis (Arabidopsis thaliana) Xyloglucan Endotransglucosylase-Hydrolase31 (XTH31) has predominately xyloglucan endohydrolase activity in vitro, loss of XTH31 results in remarkably reduced in vivo xyloglucan endotransglucosylase (XET) action and enhanced Al resistance. Here, we report that XTH17, predicted ...
    • Yield strength dependence on strain rate of molybdenum-alloy nanofibers 

      Loya, P.E.; Xia, Y.Z.; Peng, C.; Bei, H.; Zhang, P.; (2014)
      The yield strength dependence on strain rate was studied for molybdenum-alloy nanofibers with varying initialᅠdislocationᅠdensity at three different pre-strain levels.ᅠIn-situᅠtensile experiments at three displacement rates were carried out in aᅠscanning electron microscope.ᅠYield strength and its scatter decreased as a function of the pre-strain ...
    • The Yoke Saying in the "Gospel of Thomas 90" 

      DeConick, April D. (1990-09)
    • Zinc Oxide Particles Induce Activation of the Lysosome–Autophagy System 

      Popp, Lauren; Segatori, Laura (2019)
      Metal-oxide-based materials are highly versatile and used in a wide variety of applications ranging from medical technology to personal care products. Generally recognized as safe by the US Food and Drug Administration, zinc oxide (ZnO) has been increasingly used in pharmaceutical, cosmetic, food, and commodity chemical industries. As a result, ...
    • ZipA Uses a Two-Pronged FtsZ-Binding Mechanism Necessary for Cell Division 

      Cameron, Todd A.; Vega, Daniel E.; Yu, Chenfei; Xiao, Han; Margolin, William (2021)
      In most bacteria, cell division is centrally organized by the FtsZ protein, which assembles into dynamic filaments at the division site along the cell membrane that interact with other key cell division proteins. In gammaproteobacteria such as Escherichia coli, FtsZ filaments are anchored to the cell membrane by two essential proteins, FtsA and ZipA. ...
    • β-YbAlB4: A Critical Nodal Metal 

      (2012-10)
      We propose a model for the intrinsic quantum criticality of β-YbAlB4, in which a vortex in momentum space gives rise to a new type of Fermi surface singularity. The unquenched angular momentum of the |J=7/2,mJ=±5/2⟩ Yb 4f states generates a momentum-space line defect in the hybridization between 4f and conduction electrons, leading to a quasi-two-dimensional ...
    • ΛΛ Correlation Function in Au+Au Collisions at √sNN=200  GeV 

      STAR Collaboration; Butterworth, J.; Eppley, G.; Geurts, F.; Llope, W.J.; (2015)
      We present ΛΛ correlation measurements in heavy-ion collisions for Au+Au collisions at √sNN=200  GeV using the STAR experiment at the Relativistic Heavy-Ion Collider. The Lednický-Lyuboshitz analytical model has been used to fit the data to obtain a source size, a scattering length and an effective range. Implications of the measurement of the ΛΛ ...
    • ρ0 photoproduction in AuAu collisions at √sNN=62.4 GeV measured with the STAR detector 

      STAR Collaboration; Eppley, G.; Geurts, F.; Liu, J.; Llope, W.J.; (2012)
      Vector mesons may be photoproduced in relativistic heavy-ion collisions when a virtual photon emitted by one nucleus scatters from the other nucleus, emerging as a vector meson. The STAR Collaboration has previously presented measurements of coherent ρ0 photoproduction at center of mass energies of 130 GeV and 200 GeV in AuAu collisions. Here, we ...