Degree Department

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Nuclear Aerosols: Direct Simulation and Elucidation of the Role of Multiple Components, Radioactivity, Charge, Shape and Spatial Inhomogeneity (open access)

Nuclear Aerosols: Direct Simulation and Elucidation of the Role of Multiple Components, Radioactivity, Charge, Shape and Spatial Inhomogeneity

Nuclear aerosols can originate from severe core damae in light water reactors, core disruptive accidents in fast reactors, nuclear accidents during nuclear material transport, at waste disposal sites, or explosions. These aerosols evolve under natural transport processes as well as under the influence of engineered safety features. Such aerosols can be hazardous for the equipment inside the reactor, and when leaked into the environment, pose potential risks to the public. Hence, the origin, movement and distribution of these aerosols need to be studied and controlled.
Date: October 12, 2008
Creator: Loyalka, Sudarshan K.
Object Type: Report
System: The UNT Digital Library
Texas Stonewall Democratic Caucus Statewide Board Meeting and Conference Call (open access)

Texas Stonewall Democratic Caucus Statewide Board Meeting and Conference Call

A breakdown of the various topics discussed by the Texas Stonewall Democratic Caucus board members.
Date: October 12, 2008
Creator: unknown
Object Type: Text
System: The UNT Digital Library
Comparison of LiMnPO4 made by Combustion and Hydrothermal Syntheses (open access)

Comparison of LiMnPO4 made by Combustion and Hydrothermal Syntheses

Among the olivine-structured metal phosphate family, LiMnPO{sub 4} exhibits a high discharge potential (4V), which is still compatible with common electrolytes, making it interesting for use in the next generation of Li ion batteries. The extremely low electronic conductivity of this material severely limits its electrochemical performance, however. One strategy to overcome this limitation is to make LiMnPO{sub 4} nanoparticulate to decrease the diffusion distance. Another is to add a carbon or other conductive coating in intimate contact with the nanoparticles of the main phase, as is commonly done with LiFePO{sub 4}. The electrochemical performance of LiFePO{sub 4} is highly dependent on the quality of the carbon coatings on the particles, among other variables. Combustion synthesis allows the co-synthesis of nanoparticles coated with carbon in one step. Hydrothermal synthesis is used industrially to make LiFePO{sub 4} cathode materials and affords a good deal of control over purity, crystallinity, and particle size. A wide range of olivine-structured materials has been successfully prepared by this technique, including LiMnPO{sub 4} in this study. In this paper, we report on the new synthesis of nano-LiMnPO{sub 4} by a combustion method. The purity is dependent upon the conditions used for synthesis, including the type of …
Date: October 12, 2008
Creator: Chen, Jiajun; Doeff, Marca M. & Wang, Ruigang
Object Type: Article
System: The UNT Digital Library
The Origins of the Rate Enhancement in LiNi0.4Co0.2-yAlyMn0.4O2 (0<y<_0.2) Cathode Materials (open access)

The Origins of the Rate Enhancement in LiNi0.4Co0.2-yAlyMn0.4O2 (0<y<_0.2) Cathode Materials

Recently, much research has been directed towards finding a replacement cathode material for LiCoO{sub 2} combining high performance with lower cost and toxicity. One promising candidate material is the mixed transition metal oxide LiNi{sub 0.4}Co{sub 0.2}Mn{sub 0.4}O{sub 2}, which delivers 180 mAh/g below 4.4 V versus Li/Li{sup +}. However, in this material, there is 4% anti-site cation mixing, which hinders the mobility of lithium within the lattice, adversely affecting its rate performance in lithium batteries. Ongoing work in our lab has shown that partial or full substitution of cobalt with aluminum, LiNi{sub 0.4}Co{sub 0.2-y}Al{sub y}Mn{sub 0.4}O{sub 2} (0 < y {le} 0.2), can lead to significant improvements in rate performance. In particular, LiNi{sub 0.4}Co{sub 0.15}Al{sub 0.05}Mn{sub 0.4}O{sub 2} shows greatly improved rate capability with almost no sacrifice in the overall capacity delivered at low rates between 2.0 and 4.3V (Figure 1). The smaller ionic radius of Al{sup 3+} in octahedral coordination (0.535 {angstrom}) compared to Li{sup +} (0.76 {angstrom}) creates a strong driving force for the formation of a more lamellar structure in the aluminum containing materials. XRD experiments and subsequent Rietveld refinement (Figure 2) reveal a significant decrease in anti-site defect concentration upon aluminum substitution, dropping from {approx}4% at …
Date: October 12, 2008
Creator: Doeff, Marca M. & Wilcox, James D.
Object Type: Article
System: The UNT Digital Library
Polk County Enterprise (Livingston, Tex.), Vol. 126, No. 84, Ed. 1 Sunday, October 12, 2008 (open access)

Polk County Enterprise (Livingston, Tex.), Vol. 126, No. 84, Ed. 1 Sunday, October 12, 2008

Semi-weekly newspaper from Livingston, Texas that includes local, state and national news along with advertising.
Date: October 12, 2008
Creator: Reddell, Valerie
Object Type: Newspaper
System: The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 88, No. 284, Ed. 1 Sunday, October 12, 2008 (open access)

The Baytown Sun (Baytown, Tex.), Vol. 88, No. 284, Ed. 1 Sunday, October 12, 2008

Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date: October 12, 2008
Creator: Clements, Clifford E.
Object Type: Newspaper
System: The Portal to Texas History
Developing Collections of Web-Published Materials (open access)

Developing Collections of Web-Published Materials

This article discusses collection development practices to meet the unique characteristics of Web-published materials.
Date: October 12, 2008
Creator: Hsieh, Inga K.; Murray, Kathleen R. & Hartman, Cathy Nelson
Object Type: Article
System: The UNT Digital Library
[TSDC Board Meeting Minutes] (open access)

[TSDC Board Meeting Minutes]

A printed email that states a detailed breakdown of minutes from a recent executive board meeting on October 12, 2008.
Date: October 12, 2008
Creator: unknown
Object Type: Text
System: The UNT Digital Library
The Altus Times (Altus, Okla.), Vol. 110, No. 59, Ed. 1 Sunday, October 12, 2008 (open access)

The Altus Times (Altus, Okla.), Vol. 110, No. 59, Ed. 1 Sunday, October 12, 2008

Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date: October 12, 2008
Creator: Bush, Michael
Object Type: Newspaper
System: The Gateway to Oklahoma History

Faculty Recital: 2008-10-12 - Lynn Eustis, soprano and Dan Tepfer, jazz piano

Access: Use of this item is restricted to the UNT Community
Recital performed at the UNT College of Music Recital Hall.
Date: October 12, 2008
Creator: Eustis, Lynn & Tepfer, Dan
Object Type: Sound
System: The UNT Digital Library
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 94, No. 25, Ed. 1 Sunday, October 12, 2008 (open access)

Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 94, No. 25, Ed. 1 Sunday, October 12, 2008

Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date: October 12, 2008
Creator: Shance, Brenda
Object Type: Newspaper
System: The Gateway to Oklahoma History
Seminole Sentinel (Seminole, Tex.), Vol. 100, No. 2, Ed. 1 Sunday, October 12, 2008 (open access)

Seminole Sentinel (Seminole, Tex.), Vol. 100, No. 2, Ed. 1 Sunday, October 12, 2008

Semiweekly newspaper from Seminole, Texas that includes local, state, and national news along with extensive advertising.
Date: October 12, 2008
Creator: Wright, Dustin
Object Type: Newspaper
System: The Portal to Texas History
The Panola Watchman (Carthage, Tex.), Vol. 136, No. 82, Ed. 1 Sunday, October 12, 2008 (open access)

The Panola Watchman (Carthage, Tex.), Vol. 136, No. 82, Ed. 1 Sunday, October 12, 2008

Semiweekly newspaper from Carthage, Texas that includes local, state, and national news along with advertising.
Date: October 12, 2008
Creator: unknown
Object Type: Newspaper
System: The Portal to Texas History
The Express-Star (Chickasha, Okla.), Ed. 1 Sunday, October 12, 2008 (open access)

The Express-Star (Chickasha, Okla.), Ed. 1 Sunday, October 12, 2008

Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date: October 12, 2008
Creator: unknown
Object Type: Newspaper
System: The Gateway to Oklahoma History
The Message, Volume 44, Number 4, October 2008 (open access)

The Message, Volume 44, Number 4, October 2008

Newsletter of Congregation Beth Yeshurun in Houston, including news and events, upcoming services, member announcements, editorials, and other information of interest to congregants.
Date: October 12, 2008
Creator: Congregation Beth Yeshurun (Houston, Tex.)
Object Type: Journal/Magazine/Newsletter
System: The Portal to Texas History