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122
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104
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Carrier hopping in disordered semiconducting polymers: How accurate is the Miller-Abrahams model?
We performed direct calculations of carrier hopping rates in strongly disordered conjugated polymers based on the atomic structure of the system, the corresponding electronic states and their coupling to all phonon modes. We found that the dependence of hopping rates on distance and the dependence of the mobility on temperature are significantly different than the ones stemming from the simple Miller-Abrahams model, regardless of the choice of the parameters in the model. A model that satisfactorily describes the hopping rates in the system and avoids the explicit calculation of electron-phonon coupling constants was then proposed and verified. Our results indicate that, in addition to electronic density of states, the phonon density of states and the spatial overlap of the wavefunctions are the quantities necessary to properly describe carrier hopping in disordered conjugated polymers.
Date:
July 30, 2010
Creator:
Vukmirovic, Nenad & Wang, Lin-Wang
Object Type:
Article
System:
The UNT Digital Library
Climate Change: The Quality, Comparability, and Review of Emissions Inventories Vary Between Developed and Developing Nations
A letter report issued by the Government Accountability Office with an abstract that begins "Nations that are Parties to the United Nations Framework Convention on Climate Change periodically submit inventories estimating their greenhouse gas emissions. The Convention Secretariat runs a review process to evaluate inventories from 41 "Annex I" nations, which are mostly economically developed nations. The 153 "non-Annex I" nations are generally less economically developed and have less stringent inventory reporting guidelines. The Department of State (State) represents the United States in international climate change negotiations. GAO was asked to report on (1) what is known about the comparability and quality of inventories and barriers, if any, to improvement; (2) what is known about the strengths and limits of the inventory review process; and (3) views of experts on implications for current and future international agreements to reduce emissions. GAO analyzed inventory reviews and inventories from the seven highest-emitting Annex I nations and seven of the highest emitting non-Annex I nations. GAO also selected and interviewed experts."
Date:
July 30, 2010
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
Conversation about a Burushaski proverb "duljame c̣ham au-yeshi" (rich will never experience hunger)
Recording of Naseema Ali explaining the background story of a proverb in the Nagar dialect of Burushaski.
Date:
July 30, 2010
Creator:
Munshi, Sadaf
Object Type:
Sound
System:
The UNT Digital Library
Conversation about Burushaski orthography
Recording of Ghulamuddin Hunzai discussing his proposed orthography for Burushaski language in the Hunza dialect of Burushaski.
Date:
July 30, 2010
Creator:
Munshi, Sadaf & Karim, Piar
Object Type:
Sound
System:
The UNT Digital Library
Dallas Voice (Dallas, Tex.), Vol. 27, No. 11, Ed. 1 Friday, July 30, 2010
Weekly newspaper from Dallas, Texas that includes local, state, and national news and advertising of interest to the Lesbian, Gay, Bisexual, and Transgender (LGBT) community.
Date:
July 30, 2010
Creator:
Nash, Tammye
Object Type:
Newspaper
System:
The UNT Digital Library
Deepwater Horizon Oil Spill: Selected Issues for Congress
This report summarizes provisions of selected legislation - enacted and proposed - that address oil spill policy issues raised after the April 20, 2010, explosion and resulting oil spill at the Deepwater Horizon drilling platform in the Gulf of Mexico. This report focuses primarily on oil spill policy matters that concern prevention, preparedness, response, and the liability and compensation framework.
Date:
July 30, 2010
Creator:
Hagerty, Curry L. & Ramseur, Jonathan L.
Object Type:
Report
System:
The UNT Digital Library
Defense Infrastructure: Army's Privatized Lodging Program Could Benefit from More Effective Planning
A letter report issued by the Government Accountability Office with an abstract that begins "The Department of Defense (DOD) operates nearly 70,000 lodging rooms--similar to hotel rooms--and spent nearly $1 billion in 2009 to operate them. In 2002, Congress provided authority to privatize lodging facilities. Army privatized lodging at 10 installations in August 2009 and plans to privatize its remaining domestic facilities in the future. The National Defense Authorization Act for Fiscal Year 2008 requires GAO to review lodging privatization and an Army report. This report addresses (1) the factors the military services considered in their decisions to privatize, (2) challenges in the Army's privatization efforts, (3) the effect of the economic downturn on the Army's privatization program, and (4) the extent to which an Army report required by the act, issued in March 2010, addresses the elements in the law. GAO reviewed documentation and interviewed officials from the Office of the Secretary of Defense, the military services, the developer for the Army's privatization project, and four Army installations where lodging was privatized."
Date:
July 30, 2010
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
Design of Helical Cooling Channel for Muon Collider
Fast muon beam six dimensional (6D) phase space cooling is essential for muon colliders. The Helical Cooling Channel (HCC) uses hydrogen-pressurized RF cavities imbedded in a magnet system with solenoid, helical dipole, and helical quadrupole components that provide the continuous dispersion needed for emittance exchange and effective 6D beam cooling. A series of HCC segments, each with sequentially smaller aperture, higher magnetic field, and higher RF frequency to match the beam size as it is cooled, has been optimized by numerical simulation to achieve a factor of 10{sup 5} emittance reduction in a 300 m long channel with only a 40% loss of beam. Conceptual designs of the hardware required for this HCC system and the status of the RF studies and HTS helical solenoid magnet prototypes are described.
Date:
July 30, 2010
Creator:
Yonehara, Katsuya
Object Type:
Article
System:
The UNT Digital Library
Determination of the spin-flip time in ferromagnetic SrRuO3 from time-resolved Kerr measurements
We report time-resolved Kerr effect measurements of magnetization dynamics in ferromagnetic SrRuO{sub 3}. We observe that the demagnetization time slows substantially at temperatures within 15K of the Curie temperature, which is {approx} 150K. We analyze the data with a phenomenological model that relates the demagnetization time to the spin flip time. In agreement with our observations the model yields a demagnetization time that is inversely proportional to T-T{sub c}. We also make a direct comparison of the spin flip rate and the Gilbert damping coefficient showing that their ratio very close to k{sub B}T{sub c}, indicating a common origin for these phenomena.
Date:
July 30, 2010
Creator:
Kantner, C. L. S.; Langner, M. C.; Siemons, W.; Blok, J. L.; Koster, G.; Rijnders, A.J. H. M. et al.
Object Type:
Article
System:
The UNT Digital Library
Developmemt, Characterization, Production, and Demonstration of Nanofluids for Industrial Cooling Applications. Quarterly Report #7.
Pumping power measurements have been made on a series of 40-nm boehmite (AlOOH) alumina ''bricks'' (2 - 8 vol. percent in water). The alumina nanoparticles were obtained from Sasol and are designated as ''Catapal-200''. The pH of all compositions was adjusted to 3.2{+-}0.5. A complete characterization of the particles and their nanofluid thermal properties has been published in Journal of Applied Physics 106, 014304 (2009). While the nanofluid doesn't show large enhancements, it nevertheless serves as good comparisons between the experimental results and calculated results.
Date:
July 30, 2010
Creator:
Routbort, J.; Singh, D.; Timofeeva, E.; Yu, W. & France, D.
Object Type:
Report
System:
The UNT Digital Library
Discussion about the song entitled "Wahdate Shaan" in Urdu
Recording of Ghulamuddin Hunzai translating the story Wahdate Shaan into Urdu.
Date:
July 30, 2010
Creator:
Munshi, Sadaf
Object Type:
Sound
System:
The UNT Digital Library
Enhancing FEL Power with Phase Shifters
Tapering the undulator parameter is a well-known method for maintaining the resonant condition past saturation, and increasing Free Electron Laser (FEL) efficiency. In this paper, we demonstrate that shifting the electron bunch phase relative to the radiation is equivalent to tapering the undulator parameter. Using discrete phase changes derived from optimized undulator tapers for the Linac Coherent Light Source (LCLS) x-ray FEL, we show that appropriate phase shifts between undulator sections can reproduce the power enhancement of undulator tapers. Phase shifters are relatively easy to implement and operate, and could be used to aid or replace undulator tapers in optimizing FEL performance.
Date:
July 30, 2010
Creator:
Ratner, Daniel; Chao, Alex & Huang, Zhirong
Object Type:
Article
System:
The UNT Digital Library
The Express-Star (Chickasha, Okla.), Ed. 1 Friday, July 30, 2010
Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 30, 2010
Creator:
Wray, Kelly
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Federal Register, Volume 75, Number 146, July 30, 2010, Pages 44881-45046
Daily publication of the U.S. Office of the Federal Register contains rules and regulations, proposed legislation and rule changes, and other notices, including "Presidential proclamations and Executive Orders, Federal agency documents having general applicability and legal effect, documents required to be published by act of Congress, and other Federal agency documents of public interest" (p. ii). Table of Contents starts on page iii.
Date:
July 30, 2010
Creator:
United States. Office of the Federal Register.
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
FEEDSTOCK-FLEXIBLE REFORMER SYSTEM (FFRS) FOR SOLID OXIDE FUEL CELL (SOFC)- QUALITY SYNGAS
The U.S. Department of Energy National Energy Technology Laboratory funded this research collaboration effort between NextEnergy and the University of Michigan, who successfully designed, built, and tested a reformer system, which produced highquality syngas for use in SOFC and other applications, and a novel reactor system, which allowed for facile illumination of photocatalysts. Carbon and raw biomass gasification, sulfur tolerance of non-Platinum Group Metals (PGM) based (Ni/CeZrO2) reforming catalysts, photocatalysis reactions based on TiO2, and mild pyrolysis of biomass in ionic liquids (ILs) were investigated at low and medium temperatures (primarily 450 to 850 C) in an attempt to retain some structural value of the starting biomass. Despite a wide range of processes and feedstock composition, a literature survey showed that, gasifier products had narrow variation in composition, a restriction used to develop operating schemes for syngas cleanup. Three distinct reaction conditions were investigated: equilibrium, autothermal reforming of hydrocarbons, and the addition of O2 and steam to match the final (C/H/O) composition. Initial results showed rapid and significant deactivation of Ni/CeZrO2 catalysts upon introduction of thiophene, but both stable and unstable performance in the presence of sulfur were obtained. The key linkage appeared to be the hydrodesulfurization activity of the …
Date:
July 30, 2010
Creator:
Jezierski, Kelly; Tadd, Andrew; Schwank, Johannes; Kibler, Roland; McLean, David; Samineni, Mahesh et al.
Object Type:
Report
System:
The UNT Digital Library
FEL Gain Length and Taper Measurements at LCLS
We present experimental studies of the gain length and saturation power level from 1.5 nm to 1.5 {angstrom} at the Linac Coherent Light Source (LCLS). By disrupting the FEL process with an orbit kick, we are able to measure the X-ray intensity as a function of undulator length. This kick method is cross-checked with the method of removing undulator sections. We also study the FEL-induced electron energy loss after saturation to determine the optimal taper of the undulator K values. The experimental results are compared to theory and simulations.
Date:
July 30, 2010
Creator:
Ratner, Daniel; Brachmann, A.; Decker, F. J.; Ding, Y.; Dowell, D.; Emma, P. et al.
Object Type:
Article
System:
The UNT Digital Library
Genome-wide analysis of phenylpropanoid defence pathways
Article on genome-wide analysis of phenylpropanoid defence pathways.
Date:
July 30, 2010
Creator:
Naoumkina, Marina A.; Zhao, Qiao; Gallego-Giraldo, Lina; Dai, Xinbin; Zhao, Patrick Xuechun & Dixon, R. A.
Object Type:
Article
System:
The UNT Digital Library
The Greensheet (Dallas, Tex.), Vol. 34, No. 118, Ed. 1 Friday, July 30, 2010
Free weekly newspaper that includes business and classified advertising.
Date:
July 30, 2010
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Greensheet (Dallas, Tex.), Vol. 34, No. 119, Ed. 1 Friday, July 30, 2010
Free weekly newspaper that includes business and classified advertising.
Date:
July 30, 2010
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Greensheet (Houston, Tex.), Vol. 41, No. 310, Ed. 1 Friday, July 30, 2010
Free weekly newspaper that includes business and classified advertising.
Date:
July 30, 2010
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Greensheet (Houston, Tex.), Vol. 41, No. 311, Ed. 1 Friday, July 30, 2010
Free weekly newspaper that includes business and classified advertising.
Date:
July 30, 2010
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Greensheet (Houston, Tex.), Vol. 41, No. 312, Ed. 1 Friday, July 30, 2010
Free weekly newspaper that includes business and classified advertising.
Date:
July 30, 2010
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Guam: U.S. Defense Deployments
This report discusses the strategic significance of Guam for defense buildup and the force relocation and deployments from the U.S. mainland. It also discusses the concerns and issues for congress, such as allies and partner, China, and legislation.
Date:
July 30, 2010
Creator:
Kan, Shirley A.
Object Type:
Report
System:
The UNT Digital Library
The GV Tribune (Grandview, Tex.), Vol. 115, No. 30, Ed. 1 Friday, July 30, 2010
Weekly newspaper from Grandview, Texas that includes local, state, and national news along with advertising.
Date:
July 30, 2010
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History