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10,928 Matching Results
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Zimbabwe: 2008 Elections and Implications for U.S. Policy
This report provides an overview of Zimbabwe's March 2008 elections. The report discusses the power-sharing agreement, the transitional government, cholera outbreak, international reactions, and U.S. policy on Zimbabwe.
Date:
May 22, 2008
Creator:
Ploch, Lauren
Object Type:
Report
System:
The UNT Digital Library
Zimbabwe: 2008 Elections and Implications for U.S. Policy
This report provides an overview of Zimbabwe's March 2008 elections. The report discusses the power-sharing agreement, the transitional government, cholera outbreak, international reactions, and U.S. policy on Zimbabwe.
Date:
July 10, 2008
Creator:
Ploch, Lauren
Object Type:
Report
System:
The UNT Digital Library
Zimbabwe: 2008 Elections and Implications for U.S. Policy
This report provides an overview of Zimbabwe's March 2008 elections. The report discusses the power-sharing agreement, the transitional government, cholera outbreak, international reactions, and U.S. policy on Zimbabwe.
Date:
September 26, 2008
Creator:
Ploch, Lauren
Object Type:
Report
System:
The UNT Digital Library
Zirconium Oxide Nanostructures Prepared by Anodic Oxidation
Zirconium oxide is an advanced ceramic material highly useful for structural and electrical applications because of its high strength, fracture toughness, chemical and thermal stability, and biocompatibility. If highly-ordered porous zirconium oxide membranes can be successfully formed, this will expand its real-world applications, such as further enhancing solid-oxide fuel cell technology. Recent studies have achieved various morphologies of porous zirconium oxide via anodization, but they have yet to create a porous layer where nanoholes are formed in a highly ordered array. In this study, electrochemical methods were used for zirconium oxide synthesis due to its advantages over other coating techniques, and because the thickness and morphology of the ceramic fi lms can be easily tuned by the electrochemical parameters, such as electrolyte solutions and processing conditions, such as pH, voltage, and duration. The effects of additional steps such as pre-annealing and post-annealing were also examined. Results demonstrate the formation of anodic porous zirconium oxide with diverse morphologies, such as sponge-like layers, porous arrays with nanoholes ranging from 40 to 75 nm, and nanotube layers. X-ray powder diffraction analysis indicates a cubic crystallographic structure in the zirconium oxide. It was noted that increased voltage improved the ability of the membrane to …
Date:
January 1, 2008
Creator:
Dang, Y. Y.; Bhuiyan, M.S. & Paranthaman, M. P.
Object Type:
Article
System:
The UNT Digital Library
Zn-Site Determination in Protein Encapsulated ZnxFe3-xO4 Nanoparticles
The X-ray absorption spectra of the Fe and Zn L-edges for 6.7 nm Fe{sub 3}O{sub 4} nanoparticles grown inside 12 nm ferritin protein cages with 10%, 15%, 20% and 33% zinc doping, shows that the Zn is substitutional as Zn{sup 2+} within the iron oxide host structure. A Neel-Arrhenius plot of the blocking temperature in the frequency dependent ac-susceptibility measurements show that the particles are non-interacting and that the anisotropy energy barrier is reduced with Zn loading. X-ray magnetic circular dichroism (XMCD) of the Fe displays a linear decrease with Zn-doping in sharp contrast to the initial increase present in the bulk system. The most plausible explanation for the moment decrease is that Zn substitutes preferentially into the tetrahedral A-site as a Zn{sup 2+} cation, generating a mixed spinel.
Date:
October 1, 2008
Creator:
Pool, V. L.; Klem, M. T.; Holroyd, J.; Harris, T.; Arenholz, E.; Young, M. et al.
Object Type:
Article
System:
The UNT Digital Library
ZnO:Al Doping Level and Hydrogen Growth Ambient Effects on CIGS Solar Cell Performance
None
Date:
May 1, 2008
Creator:
Duenow, J. N.; Gessert, T. A.; Wood, D. M.; Egaas, B.; Noufi, R. & Coutts, T. J.
Object Type:
Presentation
System:
The UNT Digital Library
ZnO:Al Doping Level and Hydrogen Growth Ambient Effects on CIGS Solar Cell Performance: Preprint
Cu(In,Ga)Se2 (CIGS) photovoltaic (PV) cells require a highly conducting and transparent electrode for optimum device performance. ZnO:Al films grown from targets containing 2.0 wt.% Al2O3 are commonly used for this purpose. Maximum carrier mobilities of these films grown at room temperature are ~20-25 cm2V-1s-1. Therefore, relatively high carrier concentrations are required to achieve the desired conductivity, which leads to free carrier absorption in the near infrared (IR). Lightly doped films (0.05 - 0.2 wt.% Al2O3), which show less IR absorption, reach mobility values greater than 50 cm2V-1s-1 when deposited in H2 partial pressure. We incorporate these lightly doped ZnO:Al layers into CIGS PV cells produced at the National Renewable Energy Laboratory (NREL). Preliminary results show quantum efficiency values of these cells rival those of a past world-record cell produced at NREL that used 2.0 wt.% Al-doped ZnO films. The highest cell efficiency obtained in this trial was 18.1%.
Date:
May 1, 2008
Creator:
Duenow, J. N.; Gessert, T. A.; Wood, D. M.; Egaas, B.; Noufi, R. & Coutts,T. J.
Object Type:
Article
System:
The UNT Digital Library
ZZ ---> l+ l- v anti-v production in p anti-p collisions at s**(1/2) = 1.96-TeV
None
Date:
August 1, 2008
Creator:
Abazov, V. M.; /Dubna, JINR; Abbott, B.; U., /Oklahoma; Abolins, M.; U., /Michigan State et al.
Object Type:
Article
System:
The UNT Digital Library