• Effect of support pretreatment temperature on the performance of an iron Fischer-Tropsch catalyst supported on silica-stabilized alumina 

  Keyvanloo, Kamyar; Huang, Baiyu; Okeson, Trent; Hamdeh, Hussein H.; Hecker, William C. (MDPI, 2018-02-12)

  The effect of support material pretreatment temperature, prior to adding the active phase and promoters, on Fischer-Tropsch activity and selectivity was explored. Four iron catalysts were prepared on silica-stabilized ...

• Constraints on the distance moduli, helium, and metal abundances, and ages of globular clusters from their RR Lyrae and non-variable horizontal branch stars. II. multiple stellar populations in 47 Tuc, M3, and M13 

  Denissenkov, Pavel A.; VandenBerg, Don A.; Kopacki, Grzegorz; Ferguson, Jason W. (IOP Publishing, 2017-11-10)

  We present a new set of horizontal branch (HB) models computed with the MESA stellar evolution code. The models adopt alpha-enhanced Asplund et al. metal mixtures and include the gravitational settling of He. They are used ...

• Search for active-sterile neutrino mixing using neutral-current interactions in NOvA 

  Meyer, Holger; Muether, Mathew; Solomey, Nickolas (American Physical Society, 2017-10-30)

  We report results from the first search for sterile neutrinos mixing with active neutrinos through a reduction in the rate of neutral-current interactions over a baseline of 810 km between the NOvA detectors. Analyzing a ...

• Constraints on oscillation parameters from nu(e) appearance and nu(mu) disappearance in NOvA 

  Meyer, Holger; Muether, Mathew; Solomey, Nickolas (American Physical Society, 2017-06-05)

  Results are reported from an improved measurement of nu(mu) -> nu(e) transitions by the NOvA experiment. Using an exposure equivalent to 6.05 x 10(20) protons on target, 33 nu(e) candidates are observed with a background ...

• Measurement of the neutrino mixing angle theta(23) in NOvA 

  Meyer, Holger; Muether, Mathew; Solomey, Nickolas (American Physical Society, 2017-04-10)

  This Letter reports new results on muon neutrino disappearance from NOvA, using a 14 kton detector equivalent exposure of 6.05 x 10(20) protons on target from the NuMI beam at the Fermi National Accelerator Laboratory. The ...

• Hydrogenation of carbon dioxide over K-Promoted FeCo bimetallic catalysts prepared from mixed metal oxalates 

  Gnanamani, Muthu Kumaran; Hamdeh, Hussein H.; Jacobs, Gary; Shafer, Wilson D.; Hopps, Shelley D.; Thomas, Gerald A.; Davis, Burtron H. (John Wiley & Sons, Inc., 2017-04-07)

  The hydrogenation of carbon dioxide over K-promoted FeCo bimetallic catalysts prepared by sequential oxalate decomposition and carburization of FeCo with CO was studied in a fixed-bed reactor at 240 degrees C and 1.2MPa. ...

• The effects of individual metal contents on isochrones for C, N, O, Na, Mg, Al, Si, and Fe 

  Beom, Minje; Na, Chongsam; Ferguson, Jason W.; Kim, Y. -C. (IOP Publishing, 2016-07-28)

  The individual characteristics of C, N, O, Na, Mg, Al, Si, and Fe on isochrones have been investigated in this study. Stellar models have been constructed for various mixtures in which the content of each element is changed ...

• Fischer-Tropsch synthesis: effect of Cu, Mn and Zn addition on activity and product selectivity of cobalt ferrite 

  Gnanamani, Muthu Kumaran; Hamdeh, Hussein H.; Jacobs, Gary; Qian, Dali; Liu, Fang; Hopps, Shelley D.; Thomas, Gerald A.; Shafer, Wilson D.; Xiao, Qunfeng; Hu, Yongfeng; Davis, Burtron H. (Royal Society of Chemistry, 2016)

  The effect of Cu, Mn and Zn addition on cobalt ferrite was investigated for Fischer-Tropsch synthesis (FTS). Oxalate co-precipitation followed by decomposition under inert conditions was used to obtain various metal ...

• 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). ...

• 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. ...

• 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 ...

• 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) ...

• Role of Cu2+ substitution on the structural and magnetic properties of Ni-ferrite nanoparticles synthesized by the microwave-combustion method 

  Elshahawy, A. M.; Mahmoud, Mohamed H.; Makhlouf, Salah A.; Hamdeh, Hussein H. (Elsevier B.V., 2015-11)

  Ni1-xCuxFe2O4 (x=0.00, 0.05, 0.10, 0.15, 0.20 and 0.25) nanoparticles were successfully synthesized by microwave-induced combustion process using urea as fuel. The structural and magnetic properties of the samples were ...

• The NOvA far detector data acquisition system 

  Biery, Kurt; Guglielmo, Gerald; Habig, Alec; Illingworth, Robert; Kasahara, Susan; Meyer, Holger; Kwarciany, Rick; Lu, Qiming; Lukhanin, Gennadiy; Magill, Stephen; Mathis, Mark; Moren, Adam; Mualem, Leon; Muether, Mathew; Norman, Andrew; Paley, Jonathan; Perevalov, Denis; Piccoli, Luciano; Rechenmacher, Ronald; Shanahan, Peter; Suter, Louise; Waldron, Abigail; Zalesak, Jaroslav (2014)

  Biery, Kurt, et al. "The NOvA Far Detector Data Acquisition System." Journal of Physics: Conference Series 513 no 1. doi:10.1088/1742-6596/513/1/012041.

• 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 D.; 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: 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 ...

• Stellar models of multiple populations in globular clusters - I. The main sequence of NGC 6752 

  Dotter, Aaron; Ferguson, Jason W.; Conroy, Charlie; Milone, A. P.; Marino, A. F.; Yong, David (Oxford University Press, 2015-01-11)

  We present stellar atmosphere and evolution models of main-sequence stars in two stellar populations of the Galactic globular cluster NGC 6752. These populations represent the two extremes of light-element abundance ...

• 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 ...

• Structural analysis and cations distribution of nanocrystalline Ni1-xZnxFe1.7Ga0.3O4 

  Heiba, Zein K.; Mohamed, Mohamed Bakr; Hamdeh, Hussein H.; Ahmed, M. A. (Elsevier B.V., 2014-09-09)

  Nanostructured Ni1-xZnxFe1.7Ga0.3O4, with x = 0.0, 0.1, 0.2, 0.3, 0.4 and 0.5 were prepared by citrate method and were investigated using X-ray diffraction and Mossbauer spectroscopy. The structure characterized using X-ray ...

• 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 ...

View more