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Synthesis and Characterization of Cluster-Derived Supported Bimetallic Catalysts
New procedures have been developed for synthesizing di- and tri-metallic cluster complexes. The chemical properties of the new complexes have been investigated, particularly toward the activation of molecular hydrogen. These complexes were then converted into bi- and tri-metallic nanoparticles on silica and alumina supports. These nanoparticles were characterized by electron microscopy and were then tested for their ability to produce catalytic hydrogenation of unsaturated hydrocarbons and for the preferential oxidation of CO in the presence of hydrogen. The bi- and tri-metallic nanoparticles exhibited far superior activity and selectivity as hydrogenation catalysts when compared to the individual metallic components. It was found that the addition of tin greatly improved the selectivity of the catalysts for the hydrogenation of polyolefins. The addition of iron improves the catalysts for the selective oxidation of CO by platinum in the presence of hydrogen. The observations should lead to the development of lower cost routes to molecules that can be used to produce polymers and plastics for use by the general public and for procedures to purify hydrogen for use as an alternative energy in the hydrogen economy of the future.
Date:
October 10, 2008
Creator:
Adams, Richard D & Amiridis, Michael D
Object Type:
Report
System:
The UNT Digital Library
Osmose Experiment Representativity Studies.
The OSMOSE program aims at improving the neutronic predictions of advanced nuclear fuels through measurements in the MINERVE facility at the CEA-Cadarache (France) on samples containing the following separated actinides: Th-232, U-233, U-234, U-235, U-236, U-238, Np-237, Pu-238, Pu-239, Pu-240, Pu-241, Pu-242, Am-241, Am-243, Cm-244 and Cm-245. The goal of the experimental measurements is to produce a database of reactivity-worth measurements in different neutron spectra for the separated heavy nuclides. This database can then be used as a benchmark for integral reactivity-worth measurements to verify and validate reactor analysis codes and integral cross-section values for the isotopes tested. In particular, the OSMOSE experimental program will produce very accurate sample reactivity-worth measurements for a series of actinides in various spectra, from very thermalized to very fast. The objective of the analytical program is to make use of the experimental data to establish deficiencies in the basic nuclear data libraries, identify their origins, and provide guidelines for nuclear data improvements in coordination with international programs. To achieve the proposed goals, seven different neutron spectra can be created in the MINERVE facility: UO2 dissolved in water (representative of over-moderated LWR systems), UO2 matrix in water (representative of LWRs), a mixed oxide fuel matrix, …
Date:
October 10, 2007
Creator:
Aliberti, G. & Klann, R.
Object Type:
Report
System:
The UNT Digital Library
The effect of bulk composition on swelling and radiation-induced segregation in austenitic alloys.
None
Date:
October 10, 2000
Creator:
Allen, T. R.; Cole, J. I.; Dietz, N. L.; Wang, Y.; Was, G. S. & Kenik, E. A.
Object Type:
Article
System:
The UNT Digital Library
Impact of the implementation of MPI point-to-point communications on the performance of two general sparse solvers
We examine the mechanics of the send and receive mechanism of MPI and in particular how we can implement message passing in a robust way so that our performance is not significantly affected by changes to the MPI system. This leads us to using the Isend/Irecv protocol which will entail sometimes significant algorithmic changes. We discuss this within the context of two different algorithms for sparse Gaussian elimination that we have parallelized. One is a multifrontal solver called MUMPS, the other is a supernodal solver called SuperLU. Both algorithms are difficult to parallelize on distributed memory machines. Our initial strategies were based on simple MPI point-to-point communication primitives. With such approaches, the parallel performance of both codes are very sensitive to the MPI implementation, the way MPI internal buffers are used in particular. We then modified our codes to use more sophisticated nonblocking versions of MPI communication. This significantly improved the performance robustness (independent of the MPI buffering mechanism) and scalability, but at the cost of increased code complexity.
Date:
October 10, 2001
Creator:
Amestoy, Patrick R.; Duff, Iain S.; L'Excellent, Jean-Yves & Li, Xiaoye S.
Object Type:
Article
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 105, No. 177, Ed. 1 Friday, October 10, 2003
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
October 10, 2003
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 164, Ed. 1 Sunday, October 10, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
October 10, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Color transparency and pion valence quark distributions from di-jet events in Fermilab E791
Diffractive, exclusive di-jet events produced by 500 GeV/c {pi}{sup {minus}} scattered off nuclei were used to measure their A-dependence, and to make the first direct measurement of the valence-quark momentum distribution in pions. Data on the latter are compared to two limiting predictions for the pion light-cone wave-function. The results show that the asymptotic wave-function of perturbative QCD describes the data well for Q{sup 2} of 10 GeV{sup 2} and above. The measured A-dependence is consistent with observation of point-like configurations in the pion and color-transparency calculations.
Date:
October 10, 2000
Creator:
Appel, Jeffrey A.
Object Type:
Article
System:
The UNT Digital Library
Neutrino masses at v3/2
Theories in which neutrino masses are generated by a conventional see-saw mechanism generically yield masses which are O(v{sup 2}) in units where M{sub Pl} = 1, which is naively too small to explain the results from SuperKamiokande. In supersymmetric theories with gravity mediated supersymmetry breaking, the fundamental small parameter is not v/M{sub Pl}, but m{sub I}/M{sub Pl}, where m{sub I} is the scale of supersymmetry breaking in the hidden sector. We note that m{sub I}{sup 3}/M{sub Pl}{sup 2} is only slightly too large to explain SuperKamiokande, and present two models that achieve neutrino masses at this order in m{sub I}, one of which has an additional suppression {lambda}{sub {tau}}{sup 2}, while the other has additional suppression arising from a loop factor. The latter model shares a great deal of phenomenology with a class of models previously explored, including the possibility of viable sneutrino dark matter.
Date:
October 10, 2000
Creator:
Arkani-Hamed, Nima; Hall, Lawrence; Murayama, Hitoshi; Smith,David & Weiner, Neal
Object Type:
Report
System:
The UNT Digital Library
Power Corrections in Charmless Nonleptonic B Decays: Annihilationis Factorizable and Real
We classify {Lambda}{sub QCD}/m{sub b} power corrections to nonleptonic B {yields} M{sub 1}M{sub 2} decays, where M{sub 1,2} are charmless non-isosinglet mesons. Using recent developments in soft-collinear effective theory, we prove that the leading contributions to annihilation amplitudes of order {alpha}{sub s}(m{sub b}) {Lambda}{sub QCD}/m{sub b} are real. The leading annihilation amplitudes depend on twist-2 and the twist-3 three parton distributions. A complex nonperturbative parameter from annihilation first appears at {Omega}[{alpha}{sub s}{sup 2}({radical}{Lambda}m{sub b}){Lambda}{sub QCD}/m{sub b}]. 'Chirally enhanced' contributions are also factorizable and real at lowest order. Thus, incalculable strong phases are suppressed in annihilation amplitudes, unless the {alpha}{sub s}({radical}{Lambda}m{sub b}) expansion breaks down. Modeling the distribution functions, we find that (11 {+-} 9)% and (15 {+-} 11)% of the absolute values of the measured {bar B}{sup 0} {yields} K{sup -}{pi}{sup +} and B{sup -} {yields} K{sup -}K{sup 0} penguin amplitudes come from annihilation. This is consistent with the expected size of power corrections.
Date:
October 10, 2006
Creator:
Arnesen, Christian M.; Ligeti, Zoltan; Rothstein, Ira Z. & Stewart, Iain W.
Object Type:
Article
System:
The UNT Digital Library
Atmospheric Radiation Measurement Program Facilities Newsletter, September 2001.
Monthly newsletter discussing news and activities related to the Atmospheric Radiation Measurement Program, articles about weather and atmospheric phenomena, and other related topics.
Date:
October 10, 2001
Creator:
Atmospheric Radiation Measurement Program (U.S.)
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
Oral History Interview with Louis Avant, October 10, 2003
The National Museum of the Pacific War presents an oral interview with Louis Avant. Avant was 16 when the war began and joined the Navy a few years later. He was trained as an electrician, but ended up working as a machinist mate for the boat pool that served CINPAC at Hawaii and then Guam. Avant mentions boxing in several smoker events. He was a member of the boat crew that took Admiral Nimitz to the surrender ceremony.
Date:
October 10, 2003
Creator:
Avant, Louis
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with Louis Avant, October 10, 2003
The National Museum of the Pacific War presents an oral interview with Louis Avant. Avant was 16 when the war began and joined the Navy a few years later. He was trained as an electrician, but ended up working as a machinist mate for the boat pool that served CINPAC at Hawaii and then Guam. Avant mentions boxing in several smoker events. He was a member of the boat crew that took Admiral Nimitz to the surrender ceremony.
Date:
October 10, 2003
Creator:
Avant, Louis
Object Type:
Text
System:
The Portal to Texas History
Ion Beam Modification of Materials
This volume contains the proceedings of the 14th International Conference on Ion Beam Modification of Materials, IBMM 2004, and is published by Elsevier-Science Publishers as a special issue of Nuclear Instruments and Methods B. The conference series is the major international forum to present and discuss recent research results and future directions in the field of ion beam modification, synthesis and characterization of materials. The first conference in the series was held in Budapest, Hungary, 1978, and subsequent conferences were held every two years at locations around the Globe, most recently in Japan, Brazil, and the Netherlands. The series brings together physicists, materials scientists, and ion beam specialists from all over the world. The official conference language is English. IBMM 2004 was held on September 5-10, 2004. The focus was on materials science involving both basic ion-solid interaction processes and property changes occurring either during or subsequent to ion bombardment and ion beam processing in relation to materials and device applications. Areas of research included Nanostructures, Multiscale Modeling, Patterning of Surfaces, Focused Ion Beams, Defects in Semiconductors, Insulators and Metals, Cluster Beams, Radiation Effects in Materials, Photonic Devices, Ion Implantation, Ion Beams in Biology and Medicine including New Materials, Imaging, …
Date:
October 10, 2005
Creator:
Averback, B; de la Rubia, T D; Felter, T E; Hamza, A V & Rehn, L E
Object Type:
Article
System:
The UNT Digital Library
SPIN DEPENDENCE IN ELASTIC SCATTERING IN THE CNI REGION.
The interference of the electromagnetic spin-flip amplitude with a hadronic spin-nonflip amplitude in the elastic scattering of hadrons leads to significant spin dependencies at very low 4-momentum transfer t (0.001 < |t| < 0.01 (GeV/c){sup 2}). This kinematical region is known as the Coulomb Nuclear Interference (CNI) region. First results on spin effects in polarized proton-proton elastic scattering in the CNI region at 100 GeV from the 2004 polarized proton run at RHIC are presented. Preliminary results on A{sub N} in the elastic scattering of polarized protons off a carbon target over a wide energy range from 4 GeV to 100 GeV from AGS and RHIC are presented as well. These results allow us to further investigate the spin dependence in elastic scattering and the mechanisms at work.
Date:
October 10, 2004
Creator:
BRAVAR, A.; MAKDISI, Y. & AL., ET
Object Type:
Article
System:
The UNT Digital Library
Solutions to Monthly Problems 11456 and 11457
None
Date:
October 10, 2009
Creator:
Bailey, David H. & Borwein, Jonathan M.
Object Type:
Report
System:
The UNT Digital Library
The use of rotating shadowband radiometers and microwave radiometers to obtain cloud properties in arctic environments.
None
Date:
October 10, 2000
Creator:
Barnard, J. C.; Liljegren, J. C.; Min, Q. L. & Doran, J. C.
Object Type:
Article
System:
The UNT Digital Library
[Susan Mosi shaking ambassador's hand]
Photograph of the Ambassador of Tunisia, Mohamed Nejib Hachana, shaking hands with Susan Mosi, a freshman in International Studies, and holding a drink. They are gathered in the Diamond Eagle Suite in the UNT Union and there are other people waiting to meet the ambassador behind them.
Date:
October 10, 2007
Creator:
Baugh, Brian
Object Type:
Photograph
System:
The UNT Digital Library
[Tunisian Ambassador speaking to a faculty member]
Photograph of the Ambassador of Tunisia, Mohamed Nejib Hachana, speaking to a faculty member and holding a drink. They are gathered in the Diamond Eagle Suite in the UNT Union and there are other people and artwork on the wall behind them.
Date:
October 10, 2007
Creator:
Baugh, Brian
Object Type:
Photograph
System:
The UNT Digital Library
[Tunisian Ambassador speaking to students]
Photograph of the Ambassador of Tunisia, Mohamed Nejib Hachana, speaking to students on the UNT campus. They are gathered in the Diamond Eagle Suite in the UNT Union. There are rugs on the ground and a painting on the wall.
Date:
October 10, 2007
Creator:
Baugh, Brian
Object Type:
Photograph
System:
The UNT Digital Library
Confederate memorial, Fannin County
Photograph of a Confederate memorial on the grounds of the Fannin County courthouse. It is a tall monument, with a statue of a man at the top. There is text on the base of the statue, and there are cars parked behind it.
Date:
October 10, 2005
Creator:
Belden, Dreanna L.
Object Type:
Photograph
System:
The Portal to Texas History
Confederate memorial, Fannin County
Photograph of a Confederate memorial in Fannin County. It reads: "To the Confederate soldiers who sacrificed their lives for a just cause, this monument is lovingly dedicated by the Daughters of the Confederacy, aided by the Confederate Veterans Association of Fannin county."
Date:
October 10, 2005
Creator:
Belden, Dreanna L.
Object Type:
Photograph
System:
The Portal to Texas History
Cooke County Courthouse, Gainesville
Photograph of the Cooke County Courthouse under renovation. There are vans and orange construction equipment in front of the building, and many of the windows are boarded up.
Date:
October 10, 2005
Creator:
Belden, Dreanna L.
Object Type:
Photograph
System:
The Portal to Texas History
Fannin County Courthouse
Photograph of the Fannin County Courthouse in Bonham. It has many windows, and a flagpole stands in front of the building. There are four cars parked in front of the courthouse.
Date:
October 10, 2005
Creator:
Belden, Dreanna L.
Object Type:
Photograph
System:
The Portal to Texas History
First United Methodist Church, Paris
Photograph of the First United Methodist Church in Paris, Texas. It was built between 1921 and 1924. It is a three-story stone building with a dome that houses an additional story on the top.
Date:
October 10, 2005
Creator:
Belden, Dreanna L.
Object Type:
Photograph
System:
The Portal to Texas History