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Analysis of Order Formation in Block Copolymer Thin Films UsingResonant Soft X-Ray Scattering (open access)

Analysis of Order Formation in Block Copolymer Thin Films UsingResonant Soft X-Ray Scattering

The lateral order of poly(styrene-block-isoprene) copolymer(PS-b-PI) thin films is characterized by the emerging technique ofresonant soft X-ray scattering (RSOXS) at the carbon K edge and comparedto ordering in bulk samples of the same materials measured usingconventional small-angle X-ray scattering. We show resonance using theoryand experiment that the loss of scattering intensity expected with adecrease in sample volume in the case of thin films can be overcome bytuning X-rays to the pi* resonance of PS or PI. Using RSOXS, we study themicrophase ordering of cylinder- and phere-forming PS-b-PI thin films andcompare these results to position space data obtained by atomic forcemicroscopy. Our ability to examine large sample areas (~;9000 mu m2) byRSOXS enables unambiguous identification of the lateral lattice structurein the thin films. In the case of the sphere-forming copolymer thin film,where the spheres are hexagonally arranged, the average sphere-to-spherespacing is between the bulk (body-centered cubic) nearest neighbor andbulk unit cell spacings. In the case of the cylinder-forming copolymerthin film, the cylinder-to-cylinder spacing is within experimental errorof that obtained in the bulk.
Date: November 27, 2006
Creator: Virgili, Justin M.; Tao, Yuefei; Kortright, Jeffrey B.; Balsara,Nitash P. & Segalman, Rachel A.
Object Type: Article
System: The UNT Digital Library
The Baytown Sun (Baytown, Tex.), Vol. 86, No. 2, Ed. 1 Monday, November 27, 2006 (open access)

The Baytown Sun (Baytown, Tex.), Vol. 86, No. 2, Ed. 1 Monday, November 27, 2006

Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date: November 27, 2006
Creator: Clements, Clifford E.
Object Type: Newspaper
System: The Portal to Texas History
Bioterrorism Countermeasure Development: Issues in Patents and Homeland Security (open access)

Bioterrorism Countermeasure Development: Issues in Patents and Homeland Security

This report provides information about the Bioterrorism Countermeasure Development and its issues in Patents and Homeland Security.
Date: November 27, 2006
Creator: Schacht, Wendy H. & Thomas, John R.
Object Type: Report
System: The UNT Digital Library
Black Hole Production at the LHC by Standard Model Bulk Fields in the Randall-Sundrum Model. (open access)

Black Hole Production at the LHC by Standard Model Bulk Fields in the Randall-Sundrum Model.

We consider the production of black holes at the LHC in the Randall-Sundrum (RS) model through the collisions of Standard Model(SM) fields in the bulk. In comparison to the previously studied case where the SM fields are all confined to the TeV brane, we find substantial suppressions to the corresponding collider cross sections for all initial states, i.e., gg, qq and gq, where q represents a light quark or anti-quark which lie close to the Planck brane. For b quarks, which are closer to the TeV brane, this suppression effect is somewhat weaker though b quark contributions to the cross section are already quite small due to their relatively small parton densities. Semi-quantitatively, we find that the overall black hole cross section is reduced by roughly two orders of magnitude in comparison to the traditional TeV brane localized RS model with the exact value being sensitive to the detailed localizations of the light SM fermions in the bulk.
Date: November 27, 2006
Creator: Rizzo, Thomas G.
Object Type: Article
System: The UNT Digital Library
Critical Review of Mercury Chemistry in Flue Gas. (open access)

Critical Review of Mercury Chemistry in Flue Gas.

Mercury (Hg) and its compounds have long been recognized as potentially hazardous to human health and the environment. Many man-made sources of mercury have been reduced in recent years through process changes and control measures. However, emissions of mercury from coal-fired power plants, while exceedingly dilute by the usual pollution standards, still constitute a major source when considered in the aggregate. Concerns over those emissions and the prospect of impending emissions regulations have led to a wide range of research projects dealing with the measurement and control of mercury in flue gas. This work has made considerable progress in improving the understanding of mercury emissions and their behavior, but inconsistencies and unexpected results have also shown that a better understanding of mercury chemistry is needed. To develop a more complete understanding of where additional research on mercury chemistry is needed, the U.S. Department of Energy (DOE) asked Argonne National Laboratory (Argonne) to conduct a critical review of the available information as reported in the technical literature. The objectives were to summarize the current state of the art of chemistry knowledge, identify significant knowledge gaps, and recommend future research to resolve those gaps. An initial evaluation of potential review topics indicated …
Date: November 27, 2006
Creator: Mendelsohn, M. H. & Livengood, C. D.
Object Type: Report
System: The UNT Digital Library
Design and Use of a Novel Apparatus for Measuring Capsule Fill Hole Conductance (open access)

Design and Use of a Novel Apparatus for Measuring Capsule Fill Hole Conductance

Description and results of a novel apparatus for determining the flow conductance through a laser drilled hole in a spherical shell for inertial confinement fusion experiments are described. The instrument monitors the pressure of an enclosed volume containing the laser pressure drilled capsule as air bleeds through the hole into the shell. From these measurements one obtains the conductance of the fill hole. This system has proven to be a valuable tool for verifying the conduct conductance into the capsule in a timely and nondestructive manner.
Date: November 27, 2006
Creator: Seugling, R M; Nederbragt, W W; Klingmann, J L; Edson, S; Reynolds, J & Cook, R
Object Type: Article
System: The UNT Digital Library

Doctoral Recital: 2006-11-27 - Alfredo Arjona, piano

Recital presented at the UNT College of Music Concert Hall in partial fulfillment of the Doctor of Musical Arts (DMA) degree
Date: November 27, 2006
Creator: Arjona, Alfredo
Object Type: Sound
System: The UNT Digital Library

Doctoral Recital: 2006-11-27 - So Myung (Sonia) Hwang, piano

Recital presented at the UNT College of Music Concert Hall in partial fulfillment of the Doctor of Musical Arts (DMA) degree
Date: November 27, 2006
Creator: Hwang, So Myung (Sonia)
Object Type: Sound
System: The UNT Digital Library
Drug Trafficking and North Korea: Issues for U.S. Policy (open access)

Drug Trafficking and North Korea: Issues for U.S. Policy

This report gives an overview of Drug Trafficking in North Korea and discusses issues for U.S. policy
Date: November 27, 2006
Creator: Perl, Raphael F.
Object Type: Report
System: The UNT Digital Library
The effect of pulse duration on laser-induced damage by 1053-nm light in potassium dihydrogen phosphate crystals (open access)

The effect of pulse duration on laser-induced damage by 1053-nm light in potassium dihydrogen phosphate crystals

Laser induced damage in potassium dihydrogen phosphate (KDP) has previously been shown to depend significantly on pulse duration for 351-nm Gaussian pulses. In this work we studied the properties of damage initiated by 1053-nm temporally Gaussian pulses with 10ns and 3ns FWHM durations. Our results indicate that the number of damage sites induced by 1053-nm light scales with pulse duration ({tau}) as ({tau}{sub 1}/{tau}{sub 2}){sup 0.17} in contrast to the previously reported results for 351-nm light as ({tau}{sub 1}/{tau}{sub 2}){sup 0.35}. This indicates that damage site formation is significantly less probable at longer wavelengths for a given fluence.
Date: November 27, 2006
Creator: Cross, D A; Braunstein, M R & Carr, C W
Object Type: Article
System: The UNT Digital Library
Energy Penalty Analysis of Possible Cooling Water Intake Structure Requirements on Existing Coal-Fired Power Plants. (open access)

Energy Penalty Analysis of Possible Cooling Water Intake Structure Requirements on Existing Coal-Fired Power Plants.

Section 316(b) of the Clean Water Act requires that cooling water intake structures must reflect the best technology available for minimizing adverse environmental impact. Many existing power plants in the United States utilize once-through cooling systems to condense steam. Once-through systems withdraw large volumes (often hundreds of millions of gallons per day) of water from surface water bodies. As the water is withdrawn, fish and other aquatic organisms can be trapped against the screens or other parts of the intake structure (impingement) or if small enough, can pass through the intake structure and be transported through the cooling system to the condenser (entrainment). Both of these processes can injure or kill the organisms. EPA adopted 316(b) regulations for new facilities (Phase I) on December 18, 2001. Under the final rule, most new facilities could be expected to install recirculating cooling systems, primarily wet cooling towers. The EPA Administrator signed proposed 316(b) regulations for existing facilities (Phase II) on February 28, 2002. The lead option in this proposal would allow most existing facilities to achieve compliance without requiring them to convert once-through cooling systems to recirculating systems. However, one of the alternate options being proposed would require recirculating cooling in selected …
Date: November 27, 2006
Creator: Veil, J. A.; Littleton, D. J.; Gross, R. W.; Smith, D. N.; Parsons, E.L., Jr.; Shelton, W. W. et al.
Object Type: Report
System: The UNT Digital Library

Ensemble: 2006-11-27 – Center for Chamber Music Studies

Access: Use of this item is restricted to the UNT Community
Chamber music concert presented at the UNT College of Music Winspear Hall
Date: November 27, 2006
Creator: University of North Texas. Center for Chamber Music Studies.
Object Type: Sound
System: The UNT Digital Library
The Express-Star (Chickasha, Okla.), Ed. 1 Monday, November 27, 2006 (open access)

The Express-Star (Chickasha, Okla.), Ed. 1 Monday, November 27, 2006

Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date: November 27, 2006
Creator: Bush, Kent
Object Type: Newspaper
System: The Gateway to Oklahoma History
[Funeral Program for Charlene D. Hawkins, November 27, 2006] (open access)

[Funeral Program for Charlene D. Hawkins, November 27, 2006]

Funeral program for Charlene D. Hawkins, born November 3, 1929 and died November 20, 2006. The funeral was held Monday, November 27, 2006 at Second Baptist Church, officiated by Rev. Dr. Robert L. Jemerson, Pastor. Funeral arrangements were made through Sutton-Sutton Mortuary and she was buried in Fort Sam Houston National Cemetery near San Antonio, Texas.
Date: November 27, 2006
Creator: unknown
Object Type: Pamphlet
System: The Portal to Texas History
Health Savings Accounts: Overview of Rules for 2007 (open access)

Health Savings Accounts: Overview of Rules for 2007

None
Date: November 27, 2006
Creator: Lyke, Bob
Object Type: Report
System: The UNT Digital Library
Internet Gambling: An Abridged Overview of Federal Criminal Law (open access)

Internet Gambling: An Abridged Overview of Federal Criminal Law

None
Date: November 27, 2006
Creator: Doyle, Charles
Object Type: Report
System: The UNT Digital Library
Internet Gambling: Overview of Federal Criminal Law (open access)

Internet Gambling: Overview of Federal Criminal Law

This report is a brief summary of the federal criminal status implicated by conducting illegal gambling using the internet. It also discusses some of the constitutional issues associated with prosecuting illegal internet gambling.
Date: November 27, 2006
Creator: Doyle, Charles
Object Type: Report
System: The UNT Digital Library
IPNS Progress Report 2001-2006. (open access)

IPNS Progress Report 2001-2006.

In August 1981, the proton beam from the rapid cycling synchrotron (RCS) was first delivered to the Intense Pulsed Neutron Source (IPNS) neutron scattering target and now, in June 2006, it is with great joy that we celebrate the impending 25th anniversary of this event. This edition of the IPNS Progress Report will focus on the development and scientific accomplishments of the past 5 years, since our last Progress Report, but with some mention of the 25 years of IPNS experience. It is appropriate at this anniversary date to recall some of the more significant historic events that have led to the present IPNS and discuss some of the plans that will lead to even more successes. Below is a brief chronology that captures some of the developments of IPNS: 8/4/81 - First beam delivered to the neutron scattering target; 6/10/84 - IPNS produced its one billionth neutron pulse; 1/10/85 - Installed world's first solid methane moderator; 6/30/87 - 1000th experiment performed at IPNS; 9/19/87 - IPNS produced its two billionth neutron pulse; 11/20/91 - 2000th experiment performed at IPNS; 4/17/04 - IPNS produced its eight billionth neutron pulse; and 8/19/05 - 7000th experiment performed at IPNS. During the past …
Date: November 27, 2006
Creator: Marzec, B.
Object Type: Report
System: The UNT Digital Library
The National Ignition Facility (NIF) A Path to Fusion Energy (open access)

The National Ignition Facility (NIF) A Path to Fusion Energy

Fusion energy has long been considered a promising clean, nearly inexhaustible source of energy. Power production by fusion micro-explosions of inertial confinement fusion (ICF) targets has been a long term research goal since the invention of the first laser in 1960. The NIF is poised to take the next important step in the journey by beginning experiments researching ICF ignition. Ignition on NIF will be the culmination of over thirty years of ICF research on high-powered laser systems such as the Nova laser at LLNL and the OMEGA laser at the University of Rochester as well as smaller systems around the world. NIF is a 192 beam Nd-glass laser facility at LLNL that is more than 90% complete. The first cluster of 48 beams is operational in the laser bay, the second cluster is now being commissioned, and the beam path to the target chamber is being installed. The Project will be completed in 2009 and ignition experiments will start in 2010. When completed NIF will produce up to 1.8 MJ of 0.35 {micro}m light in highly shaped pulses required for ignition. It will have beam stability and control to higher precision than any other laser fusion facility. Experiments using …
Date: November 27, 2006
Creator: Moses, Edward
Object Type: Article
System: The UNT Digital Library
The Oklahoma Daily (Norman, Okla.), Vol. 91, No. 69, Ed. 1 Monday, November 27, 2006 (open access)

The Oklahoma Daily (Norman, Okla.), Vol. 91, No. 69, Ed. 1 Monday, November 27, 2006

Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date: November 27, 2006
Creator: Savage, William W., III
Object Type: Newspaper
System: The Gateway to Oklahoma History
Possible Signals of Wino LSP at the Large Hadron Collider (open access)

Possible Signals of Wino LSP at the Large Hadron Collider

We consider a class of anomaly-mediated supersymmetry breaking models where gauginos acquire masses mostly from anomaly mediation while masses of other superparticles are from Kaehler interactions, which are as large as gravitino mass {approx} {Omicron}(10-100) TeV. In this class of models, the neutral Wino becomes the lightest superparticle in a wide parameter region. The mass splitting between charged and neutral Winos are very small and experimental discovery of such Winos is highly non-trivial. We discuss how we should look for Wino-induced signals at Large Hadron Collider.
Date: November 27, 2006
Creator: Ibe, M.; Moroi, Takeo & Yanagida, T. T.
Object Type: Report
System: The UNT Digital Library
Reduction of Thermal Conductivity in Wafer-Bonded Silicon (open access)

Reduction of Thermal Conductivity in Wafer-Bonded Silicon

Blocks of silicon up to 3-mm thick have been formed by directly bonding stacks of thin wafer chips. These stacks showed significant reductions in the thermal conductivity in the bonding direction. In each sample, the wafer chips were obtained by polishing a commercial wafer to as thin as 36 {micro}m, followed by dicing. Stacks whose starting wafers were patterned with shallow dots showed greater reductions in thermal conductivity. Diluted-HF treatment of wafer chips prior to bonding led to the largest reduction of the effective thermal conductivity, by approximately a factor of 50. Theoretical modeling based on restricted conduction through the contacting dots and some conduction across the planar nanometer air gaps yielded fair agreement for samples fabricated without the HF treatment.
Date: November 27, 2006
Creator: Liau, ZL; Danielson, LR; Fourspring, PM; Hu, L; Chen, G & Turner, GW
Object Type: Article
System: The UNT Digital Library
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 92, No. 14, Ed. 1 Monday, November 27, 2006 (open access)

Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 92, No. 14, Ed. 1 Monday, November 27, 2006

Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date: November 27, 2006
Creator: Mattox, Jami
Object Type: Newspaper
System: The Gateway to Oklahoma History
Screening and Ranking Framework (SRF) for Geologic CO2 Storage Site Selection on the Basis of Hse Risk (open access)

Screening and Ranking Framework (SRF) for Geologic CO2 Storage Site Selection on the Basis of Hse Risk

A screening and ranking framework (SRF) has been developedto evaluate potential geologic carbon dioxide (CO2) storage sites on thebasis of health, safety, and environmental (HSE) risk arising from CO2leakage. The approach is based on the assumption that CO2 leakage risk isdependent on three basic characteristics of a geologic CO2 storage site:(1) the potential for primary containment by the target formation; (2)the potential for secondary containment if the primary formation leaks;and (3) the potential for attenuation and dispersion of leaking CO2 ifthe primary formation leaks and secondary containment fails. Theframework is implemented in a spreadsheet in which users enter numericalscores representing expert opinions or published information along withestimates of uncertainty. Applications to three sites in Californiademonstrate the approach. Refinements and extensions are possible throughthe use of more detailed data or model results in place of propertyproxies.
Date: November 27, 2006
Creator: Oldenburg, Curtis M.
Object Type: Article
System: The UNT Digital Library