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2,195 Matching Results

Start Over Year 2011 Day 4th

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Results: 1 - 24 of 2,195 next

(open access)

Measurement of the 8B Solar Neutrino Flux with KamLAND

We report a measurement of the neutrino-electron elastic scattering rate from {sup 8}B solar neutrinos based on a 123 kton-day exposure of KamLAND. The background-subtracted electron recoil rate, above a 5.5-MeV analysis threshold is 1.49 {+-} 0.14(stat) {+-} 0.17(syst) events per kton-day. Interpreted as due to a pure electron flavor flux with a {sup 8}B neutrino spectrum, this corresponds to a spectrum integrated flux of 2.77 {+-} 0.26(stat) {+-} 0.32(syst) x 10{sup 6} cm{sup -2}s{sup -1}. The analysis threshold is driven by {sup 208}Tl present in the liquid scintillator, and the main source of systematic uncertainty is due to background from cosmogenic {sup 11}Be. The measured rate is consistent with existing measurements and with standard solar model predictions which include matter-enhanced neutrino oscillation.

Date: June 4, 2011

Creator: Abe, S.; Furuno, K.; Gando, A.; Gando, Y.; Ichimura, K.; Ikeda, H. et al.

Object Type: Article

System: The UNT Digital Library

(open access)

DEMONSTRATION OF MIXING AND TRANSFERRING SETTLING COHESIVE SLURRY SIMULANTS IN THE AY-102 TANK

In support of Hanford's waste certification and delivery of tank waste to the Waste Treatment and Immobilization Plant (WTP), Savannah River National Laboratory (SRNL) was tasked by the Washington River Protection Solutions (WRPS) to evaluate the effectiveness of mixing and transferring tank waste in a Double Shell Tank (DST) to the WTP Receipt Tank. The work discussed in this report (Phase III) address the impacts cohesive simulants have on mixing and batch transfer performance. The objective of the demonstrations performed in Phase III was to determine the impact that cohesive particle interactions in the simulants have on tank mixing using 1/22{sup nd} scale mixing system and batch transfer of seed particles. This testing is intended to provide supporting evidence to the assumption that Hanford Small Scale Mixing Demonstration (SSMD) testing in water is conservative. The batch transfers were made by pumping the simulants from the Mixing Demonstration Tank (MDT) to six Receipt Tanks (RTs), and the consistency in the amount of seed particles in each batch was compared. Tests were conducted with non-Newtonian cohesive simulants with Bingham yield stress ranging from 0.3 Pa to 7 Pa. Kaolin clay and 100 {mu}m stainless steel seed particles were used for all the …

Date: August 4, 2011

Creator: Adamson, D.

Object Type: Report

System: The UNT Digital Library

(open access)

A Regional Seismic Array of Three-Component Stations in Central Saudi Arabia

None

Date: May 4, 2011

Creator: Al-Amri, A.; Harris, D.; Fnais, M.; Rodgers, A. & Hemaida, M.

Object Type: Article

System: The UNT Digital Library

(open access)

Study of Abnormal Vertical Emittance Growth in ATF Extraction Line

Since several years, the vertical beam emittance measured in the Extraction Line (EXT) of the Accelerator Test Facility (ATF) at KEK, that will transport the electron beam from the ATF Damping Ring (DR) to the future ATF2 Final Focus beam line, is significantly larger than the emittance measured in the DR itself, and there are indications that it grows rapidly with increasing beam intensity. This longstanding problem has motivated studies of possible sources of this anomalous emittance growth. One possible contribution is non-linear magnetic fields in the extraction region experimented by the beam while passing off-axis through magnets of the DR during the extraction process. In this paper, simulations of the emittance growth are presented and compared to observations. These simulations include the effects of predicted non-linear field errors in the shared DR magnets and orbit displacements from the reference orbit in the extraction region. Results of recent measurements using closed orbit bumps to probe the relation between the extraction trajectory and the anomalous emittance growth are also presented.

Date: November 4, 2011

Creator: Alabau, M.; Faus-Golfe, A.; /Valencia U., IFIC; Alabau, M.; Bambade, P.; Brossard, J. et al.

Object Type: Article

System: The UNT Digital Library

transcript

Oral History Interview with Marvin T. Alexander, April 4, 2011

Transcript of an oral interview with Marvin T. Alexander. Alexander grew up in Louisiana and entered the Navy in early 1941. Upon completion of basic training at San Diego, Alexander was assigned as an engine mechanic to Patrol Squadron 12 (VP-12), which flew PBY airplanes at Coronado Naval Air Station. His unit was sent to Pearl Harbor in October, 1941. Alexander describes what he witnessed at Ford Island on 7 December 1941 when the Japanese attacked Pearl Harbor. Alexander was also present on Midway during the Battle of Midway. Eventually, VP-12 headed for the Solomon Islands where they conducted search and rescue operations. Alexander and VP-12 stayed aboard the USS Wright (AV-1), a seaplane tender. Sometime in 1943, Alexander received some home leave and returned to the US. He was still stationed in the US when the war ended.

Date: April 4, 2011

Creator: Alexander, Marvin T.

Object Type: Sound

System: The Portal to Texas History

(open access)

Oral History Interview with Marvin T. Alexander, April 4, 2011

Date: April 4, 2011

Creator: Alexander, Marvin T.

Object Type: Text

System: The Portal to Texas History

(open access)

2011 GASEOUS IONS GORDON RESEARCH CONFERENCE

The Gaseous Ions: Structures, Energetics and Reactions Gordon Research Conference will focus on ions and their interactions with molecules, surfaces, electrons, and light. The conference will cover theory and experiments, and systems ranging from molecular to biological to clusters to materials. The meeting goal continues to be bringing together scientists interested in fundamentals, with those applying fundamental phenomena to a wide range of practical problems. Each of the ten conference sessions will focus on a topic within this spectrum, and there will also be poster sessions for contributed papers, with sufficient space and time to allow all participants to present their latest results. To encourage active participation by young investigators, about ten of the poster abstracts will be selected for 15 minute 'hot topic' talks during the conference sessions. Hot topic selection will be done about a month before the meeting. Funds should be available to offset the participation cost for young investigators.

Date: March 4, 2011

Creator: Anderson, Scott

Object Type: Article

System: The UNT Digital Library

(open access)

The European Union: Questions and Answers

This report provides a brief overview of the European Union (EU), an economic and political partnership between 27 sovereign member states. The report describes the formation of the EU, the three main institutions of the EU, and the EU's relationship with the United States.

Date: May 4, 2011

Creator: Archick, Kristin & Mix, Derek E.

Object Type: Report

System: The UNT Digital Library

(open access)

Political Transition in Tunisia

This report discusses Tunisia's "Jasmine Revolution," the common term for President Zine El Abidine Ben Ali's flight from the country following weeks of mounting anti-government protests. This report discusses how the Jasmine Revolution appears to have added momentum to anti-government sentiment in Egypt, Libya, Yemen, and other countries. This report discusses Tunisia's pro-democracy movement; concerns over potential instability in a previously secure, pro-Western area; and U.S.-Tunisian relations.

Date: March 4, 2011

Creator: Arieff, Alexis

Object Type: Report

System: The UNT Digital Library

(open access)

Optimal alignment of mirror based pentaprisms for scanning deflectometric devices

In the recent work [Proc. of SPIE 7801, 7801-2/1-12 (2010), Opt. Eng. 50(5) (2011), in press], we have reported on improvement of the Developmental Long Trace Profiler (DLTP), a slope measuring profiler available at the Advanced Light Source Optical Metrology Laboratory, achieved by replacing the bulk pentaprism with a mirror based pentaprism (MBPP). An original experimental procedure for optimal mutual alignment of the MBPP mirrors has been suggested and verified with numerical ray tracing simulations. It has been experimentally shown that the optimally aligned MBPP allows the elimination of systematic errors introduced by inhomogeneity of the optical material and fabrication imperfections of the bulk pentaprism. In the present article, we provide the analytical derivation and verification of easily executed optimal alignment algorithms for two different designs of mirror based pentaprisms. We also provide an analytical description for the mechanism for reduction of the systematic errors introduced by a typical high quality bulk pentaprism. It is also shown that residual misalignments of an MBPP introduce entirely negligible systematic errors in surface slope measurements with scanning deflectometric devices.

Date: March 4, 2011

Creator: Barber, Samuel K.; Geckeler, Ralf D.; Yashchuk, Valeriy V.; Gubarev, Mikhail V.; Buchheim, Jana; Siewert, Frank et al.

Object Type: Article

System: The UNT Digital Library

(open access)

U.S. Energy: Overview and Key Statistics

This report presents a current and historical view of the supply and consumption of various forms of energy including oil, electricity, coal, and renewable energies. It includes compiled statistics and charts.

Date: April 4, 2011

Creator: Behrens, Carl E. & Glover, Carol

Object Type: Report

System: The UNT Digital Library

(open access)

2011 Plant Lipids: Structure, Metabolism, & Function Gordon Research Conference

This is the second Gordon Research Conference on 'Plant Lipids: Structure, Metabolism & Function'. It covers current topics in lipid structure, metabolism and function in eukaryotic photosynthetic organisms including seed plants, algae, mosses and ferns. Work in photosynthetic bacteria is considered as well as it serves the understanding of specific aspects of lipid metabolism in plants. Breakthroughs are discussed in research on plant lipids as diverse as glycerolipids, sphingolipids, lipids of the cell surface, isoprenoids, fatty acids and their derivatives. The program covers nine concepts at the forefront of research under which afore mentioned plant lipid classes are discussed. The goal is to integrate areas such as lipid signaling, basic lipid metabolism, membrane function, lipid analysis, and lipid engineering to achieve a high level of stimulating interaction among diverse researchers with interests in plant lipids. One Emphasis is on the dynamics and regulation of lipid metabolism during plant cell development and in response to environmental factors.

Date: February 4, 2011

Creator: Benning, Christopher

Object Type: Article

System: The UNT Digital Library

(open access)

A Non-scaling Fixed Field Alternating Gradient Accelerator for the Final Acceleration Stage of the International Design Study of the Neutrino Factory.

The International Design Study of the Neutrino Factory (IDS-NF) has recently completed its Interim Design Report (IDR), which presents our current baseline design of the neutrino factory. To increase the efficiency and reduce the cost of acceleration, the IDR design uses a linear non-scaling fixed field alternating gradient accelerator (FFAG) for its final acceleration stage. We present the current lattice design of that FFAG, including the main ring plus its injection and extraction systems. We describe parameters for the main ring magnets, kickers, and septa, as well as the power supplies for the kickers. We present a first pass at an engineering layout for the ring and its subsystems.

Date: September 4, 2011

Creator: Berg, J. S.; Aslaninejad, M.; Pasternak, J.; Witte, H.; Bliss, N.; Cordwell M. et al.

Object Type: Article

System: The UNT Digital Library

(open access)

Stochastic cooling of a high energy collider

Gold beams in RHIC revolve more than a billion times over the course of a data acquisition session or store. During operations with these heavy ions the event rates in the detectors decay as the beams diffuse. A primary cause for this beam diffusion is small angle Coloumb scattering of the particles within the bunches. This intra-beam scattering (IBS) is particularly problematic at high energy because the negative mass effect removes the possibility of even approximate thermal equilibrium. Stochastic cooling can combat IBS. A theory of bunched beam cooling was developed in the early eighties and stochastic cooling systems for the SPS and the Tevatron were explored. Cooling for heavy ions in RHIC was also considered.

Date: September 4, 2011

Creator: Blaskiewicz, M.; Brennan, J. M.; Lee, R. C. & Mernick, K.

Object Type: Article

System: The UNT Digital Library

(open access)

Demographic Trends of College Students Today & Tomorrow: How Do We Entice Them to Use the Academic Library?

This article discusses how libraries can use demographic trends to tailor library services to future populations.

Date: November 4, 2011

Creator: Bloechle, Marie & Brannon, Sian

Object Type: Paper

System: The UNT Digital Library

(open access)

Community Development Block Grants: Funding Issues in the 112th Congress and Recent Funding History

This report discusses funding Issues in the 112th Congress and Recent Funding History The Administration's FY2012 budget proposes to: (1) increase funding for CDBG formula grants by 10.5% from $3.303 billion appropriated in FY2010 to $3.691 billion; (2) eliminate funding for the Neighborhood Initiative and Economic Development Initiative programs; (3) eliminate funding for Section 107 activities; (4) transfer its Sustainable Communities Initiative to a new stand alone account; and (5) convert Section 108 loan guarantees to a fee-based program.

Date: May 4, 2011

Creator: Boyd, Eugene

Object Type: Report

System: The UNT Digital Library

(open access)

Evolved QCD predictions for the meson-photon transition form factors: beyond the semiclassical AdS/QCD approximation

The QCD evolution of the pion distribution amplitude (DA) {phi}{sub {pi}} (x, Q{sup 2}) is computed for several commonly used models. Our analysis includes the nonperturbative form predicted by lightfront holographic QCD, thus combining the nonperturbative bound state dynamics of the pion with the perturbative ERBL evolution of the pion distribution amplitude. We calculate the meson-photon transition form factors for the {pi}{sup 0}, {eta} and {eta}' using the hard-scattering formalism. We point out that a widely-used approximation of replacing {phi} (x; (1 - x)Q) with {phi} (x;Q) in the calculations will unjustifiably reduce the predictions for the meson-photon transition form factors. It is found that the four models of the pion DA discussed give very different predictions for the Q{sup 2} dependence of the meson-photon transition form factors in the region of Q{sup 2} > 30 GeV{sup 2}. More accurate measurements of these transition form factors at the large Q{sup 2} region will be able to distinguish the four models of the pion DA. The rapid growth of the large Q{sup 2} data for the pion-photon transition form factor reported by the BABAR Collaboration is difficult to explain within the current framework of QCD. If the BABAR data for the …

Date: November 4, 2011

Creator: Brodsky, Stanley J.; /SLAC; Cao, Fu-Guang; U., /Massey U. /Beijing Normal; de Teramond, Guy F. & U., /Costa Rica

Object Type: Article

System: The UNT Digital Library