Now showing items 1-20 of 31

  • Accessibility and selective stabilization of the principal spin states of iron by pyridyl versus phenolic ketimines: modulation of the (6)a(1) <-> t-2(2) ground-state transformation of the [fen4o2](+) chromophore 

    Shongwe, Musa S.; Al-Zaabi, Usama A.; Al-Mjeni, Faizah; Eribal, Carla S.; Sinn, Ekkehard; Al-Omari, Imaddin A.; Hamdeh, Hussein H.; Matoga, Dariusz; Adams, Harry; Morris, Michael J.; Rheingold, Arnold L.; Bill, Eckhard; Sellmyer, David J. (AMER CHEMICAL SOC, 2012-08-06)
    Several potentially tridentate pyridyl and phenolic Schiff bases (apRen and HhapRen, respectively) were derived from the condensation reactions of 2-acetylpyridine (ap) and 2'-hydroxyacetophenone (Hhap), respectively, with ...
  • Cation distribution and dielectric properties of nanocrystalline gallium substituted nickel ferrite 

    Heiba, Zein K.; Mohamed, Mohamed Bakr; Ahmed, M. A.; Moussa, M. A. A.; Hamdeh, Hussein H. (Elsevier B.V., 2014-02-16)
    Nano crystalline NiFe2−xGaxO4, 0.0 ⩽ x ⩽ 1 ferrite was prepared by citrate method. The structural and micro structural evolutions of the nanophase have been studied using X-ray powder diffraction and the Rietveld method. ...
  • Effect of H2S in syngas on the Fischer-Tropsch synthesis performance of a precipitated iron catalyst 

    Ma, Wenping; Jacobs, Gary; Sparks, Dennis E.; Shafer, Wilson D.; Hamdeh, Hussein H.; Hopps, Shelley D.; Pendyala, Venkat Ramana Rao; Hu, Yongfeng; Xiao, Qunfeng; Davis, Burtron H. (Elsevier B.V., 2016-03-05)
    The sulfur limit, the relationship between the sulfur added and the surface Fe atoms lost (Fe/S), and mechanism of sulfur poisoning were studied using an iron Fischer-Tropsch synthesis (FTS) catalyst (100 Fe/5.1 Si/2.0Cu/3.0K). ...
  • Enhancement of the critical current density in FeO-coated MgB2 thin films at high magnetic fields 

    Surdu, Andrei E.; Hamdeh, Hussein H.; Al-Omari, Imaddin A.; Sellmyer, David J.; Socrovisciuc, Alexei V.; Prepelita, Andrei A.; Koparan, Ezgi T.; Yanmaz, Ekrem; Ryazanov, Valery V.; Hahn, Horst; Sidorenko, Anatolie S. (BEILSTEIN-INSTITUT, 2011-12-14)
    The effect of depositing FeO nanoparticles with a diameter of 10 nm onto the surface of MgB2 thin films on the critical current density was studied in comparison with the case of uncoated MgB2 thin films. We calculated the ...
  • First measurement of electron neutrino appearance in NOvA 

    Meyer, Holger; Muether, Mathew; Solomey, Nickolas (American Physical Society, 2016-04-13)
    We report results from the first search for nu(mu) -> nu(e) transitions by the NOvA experiment. In an exposure equivalent to 2.74 x 10(20) protons on target in the upgraded NuMI beam at Fermilab, we observe 6 events in the ...
  • First measurement of muon-neutrino disappearance in NOvA 

    NOvA Collaboration; Meyer, Holger; Muether, Mathew; Solomey, Nickolas (American Physical Society, 2016-03-25)
    This paper reports the first measurement using the NOvA detectors of nu(mu) disappearance in a nu(mu) beam. The analysis uses a 14 kton-equivalent exposure of 2.74 x 10(20) protons-on-target from the Fermilab NuMI beam. ...
  • Fischer-Tropsch synthesis: activity and selectivity of chi-Fe5C2 and circle minus-Fe3C carbides 

    Gnanamani, Muthu Kumaran; Hamdeh, Hussein H.; Jacobs, Gary; Shafer, Wilson D.; Sparks, Dennis E.; Keogh, Robert A.; Davis, Burtron H. (American Chemical Society, 2014-08-10)
    Two different iron carbides, Hägg (χ-Fe5C2) and cementite (ϴ-Fe3C) for Fischer-Tropsch synthesis (FTS) was investigated. Both iron carbides were oxidized to Fe3O4 ​during FTS. Hägg carbide (χ-Fe5C2), initially exhibits ...
  • Fischer-Tropsch synthesis: deactivation as a function of potassium promoter loading for precipitated iron catalyst 

    Pendyala, Venkat Ramana Rao; Graham, Uschi M.; Jacobs, Gary; Hamdeh, Hussein H.; Davis, Burtron H. (Springer, 2014-10)
    The effect of potassium promoter loading (0, 0.5, 1.0 and 2.0 atomic ratio) on the performance of precipitated iron catalysts was investigated during Fischer-Tropsch synthesis using a continuously stirred tank reactor. ...
  • Fischer-Tropsch synthesis: effect of activation gas after varying Cu promoter loading over K-promoted Fe-based catalyst 

    Pendyala, Venkat Ramana Rao; Jacobs, Gary; Hamdeh, Hussein H.; Shafer, Wilson D.; Sparks, Dennis E.; Hopps, Shelley G.; Davis, Burtron H. (© Springer, 2014-09)
    The effects of activation gas and copper promoter loading on the Fischer-Tropsch synthesis performance of potassium promoted precipitated iron-based catalysts were investigated using a continuously stirred tank reactor. ...
  • Fischer-Tropsch synthesis: Effect of ammonia in syngas on the Fischer-Tropsch synthesis performance of a precipitated iron catalyst 

    Ma, Wenping; Jacobs, Gary; Sparks, Dennis E.; Pendyala, Venkat Ramana Rao; Hopps, Shelley G.; Thomas, Gerald A.; Hamdeh, Hussein H.; MacLennan, Aimee; Hu, Yongfeng; Davis, Burtron H. (Elsevier B.V., 2015-06)
    The effect of ammonia in syngas on the Fischer-Tropsch synthesis (FTS) reaction over 100Fe/5.1Si/2.0Cu/3.0K catalyst was studied at 220-270 degrees C and 1.3 MPa using a 1-L slurry phase reactor. The ammonia added in syngas ...
  • Fischer-Tropsch Synthesis: effect of potassium on activity and selectivity for oxide and carbide Fe catalysts 

    Gnanamani, Muthu Kumaran; Hamdeh, Hussein H.; Shafer, Wilson D.; Sparks, Dennis E.; Davis, Burtron H. (Springer US, 2013-11)
    The effect of potassium on oxides and carbides of iron for Fischer-Tropsch synthesis (FTS) was investigated by pretreating Fe3O4 and K-promoted Fe catalysts with different gases (H-2/H2O and CO). A freshly activated sample ...
  • Fischer-Tropsch synthesis: Effects of hydrohalic acids in syngas on a precipitated iron catalyst 

    Ma, Wenping; Jacobs, Gary; Thomas, Gerald A.; Shafer, Wilson D.; Sparks, Dennis E.; Hamdeh, Hussein H.; Davis, Burtron H. (American Chemical Society, 2015-05)
    The current investigation was undertaken to identify limits of hydrohalic acid (HX, X = F, Cl, Br) impurities in syngas and shed light on the mechanism of FIX poisoning of a 100 Fe/5.1 Si/2 Cu/3 K FTS catalyst under ...
  • Fischer-Tropsch synthesis: morphology, phase transformation, and carbon-layer growth of iron-based catalysts 

    Pendyala, Venkat Ramana Rao; Graham, Uschi M.; Jacobs, Gary; Hamdeh, Hussein H.; Davis, Burtron H. (John Wiley & Sons, Inc., 2014-07)
    The morphological, phase transformations and carbon-layer growth for unpromoted and K-promoted iron catalysts were investigated over time during Fischer-Tropsch synthesis. Catalysts were activated in CO for 24 h, which ...
  • Fischer–Tropsch synthesis: Mössbauer investigation of iron containing catalysts for hydrogenation of carbon dioxide 

    Gnanamani, Muthu Kumaran; Jacobs, Gary; Hamdeh, Hussein H.; Shafer, Wilson D.; Davis, Burtron H. (Elsevier, 2012-05-25)
    CO2 hydrogenation was investigated with a doubly promoted (Cu, K) silica containing iron catalyst. Hägg carbide (χ-Fe5C2) is the dominant phase obtained under CO activation conditions at 543 K and 0.1 MPa and it was stable ...
  • From the color-magnitude diagram of omega centauri and (super-) asymptotic giant branch stellar models to a galactic plane passage gas purging chemical evolution scenario 

    Herwig, Falk; VandenBerg, Don A.; Navarro, Julio F.; Ferguson, Jason W.; Paxton, Bill (IOP Publishing, 2012-10-01)
    We have investigated the color-magnitude diagram of omega Centauri and find that the blue main sequence (bMS) can be reproduced only by models that have a helium abundance in the range Y = 0.35-0.40. To explain the faint ...
  • The HANOHANO Detector and Ongoing Research and Development 

    Cicenas, Blake; Solomey, Nickolas (Elsevier, 2012)
    The Hanohano neutrino detector is a deep sea module that can be submerged to the ocean floor far away from surface radiation. Its Physics goals are the study of geo-neutrinos to probe the isotope source of the 45 TW of ...
  • Hydrogenation of Carbon Dioxide over Co-Fe Bimetallic Catalysts 

    Gnanamani, Muthu Kumaran; Jacobs, Gary; Hamdeh, Hussein H.; Shafer, Wilson D.; Liu, Fang; Hopps, Shelley D.; Thomas, Gerald A.; Davis, Burtron H. (American Chemical Society, 2016-02)
    A series of Co-Fe bimetallic catalysts was prepared, characterized, and studied for the hydrogenation of carbon dioxide. The catalyst precursors were prepared via an oxalate coprecipitation method. Monometallic (Co or Fe) ...
  • Measurement of charged pion production yields off the NuMI target 

    Paley, Jonathan; Messier, M. D.; Raja, R.; Akgun, U.; Asner, D. M.; Aydin, G.; Baker, W.; Barnes, P. D. Jr; Bergfeld, T.; Beverly, L.; Bhatnagar, V.; Choudhary, B.; Dukes, E. C.; Duru, F.; Feldman, G. J.; Godley, A.; Graf, N.; Gronberg, J.; Gulmez, E.; Gunaydin, Y. O.; Gustafson, H. R.; Hartouni, E. P.; Hanlet, P.; Heffner, M.; Kaplan, D. M.; Kamaev, O.; Klay, J.; Kumar, A.; Lange, D. J.; Lebedev, A.; Ling, J.; Longo, M. J.; Lu, L. C.; Materniak, C.; Mahajan, S.; Meyer, Holger; Miller, D. E.; Mishra, S. R.; Nelson, K.; Nigmanov, T.; Norman, Andrew; Onel, Y.; Penzo, A.; Peterson, R. J.; Rajaram, D.; Ratnikov, D.; Rosenfeld, C.; Rubin, H.; Seun, S.; Singh, A.; Solomey, Nickolas; Soltz, R. A.; Torun, Y.; Wilson, K.; Wright, D. M.; Wu, Q. K. (American Physical Society, 2014-09)
    The fixed-target Main Injector Particle Production (MIPP) experiment, Fermilab E907, was designed to measure the production of hadrons from the collisions of hadrons of momenta ranging from 5 to 120 GeV/c on a variety of ...
  • Mossbauer and magnetization studies of nickel ferrite nanoparticles synthesized by the microwave-combustion method 

    Mahmoud, Mohamed H.; Elshahawy, A. M.; Makhlouf, Salah A.; Hamdeh, Hussein H. (ELSEVIER SCIENCE BV, 2013-10)
    Nanocrystalline nickel ferrite was synthesized from its stoichiometric metal nitrates and urea mixtures, using a microwave assisted combustion method. The process was a convenient, inexpensive and an efficient method for ...
  • Multiqubit entanglement of a general input state 

    Behrman, Elizabeth C.; Steck, James E. (Rinton Press, Inc., 2013-01)
    Measurement of entanglement remains an important problem for quantum information. We present the design and simulation of an experimental method for an entanglement indicator for a general multiqubit state. The system can ...