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Astrophysical Gyrokinetics: Kinetic and Fluid Turbulent Cascades In Magentized Weakly Collisional Plasmas
This paper presents a theoretical framework for understanding plasma turbulence in astrophysical plasmas. It is motivated by observations of electromagnetic and density fluctuations in the solar wind, interstellar medium and galaxy clusters, as well as by models of particle heating in accretion disks. All of these plasmas and many others have turbulentmotions at weakly collisional and collisionless scales. The paper focuses on turbulence in a strong mean magnetic field. The key assumptions are that the turbulent fluctuations are small compared to the mean field, spatially anisotropic with respect to it and that their frequency is low compared to the ion cyclotron frequency. The turbulence is assumed to be forced at some system-specific outer scale. The energy injected at this scale has to be dissipated into heat, which ultimately cannot be accomplished without collisions. A kinetic cascade develops that brings the energy to collisional scales both in space and velocity. The nature of the kinetic cascade in various scale ranges depends on the physics of plasma fluctuations that exist there. There are four special scales that separate physically distinct regimes: the electron and ion gyroscales, the mean free path and the electron diffusion scale. In each of the scale ranges separated …
Date:
April 23, 2009
Creator:
A.A. Schekochihin, S.C. Cowley, W. Dorland, G.W. Hammett, G.G. Howes, E. Quataert, and T. Tatsuno
Object Type:
Report
System:
The UNT Digital Library
Co-ordination of the International Network of Nuclear Structure and Decay Data Evaluators; Summary Report of an IAEA Technical Meeting
The IAEA Nuclear Data Section convened the 18th meeting of the International Network of Nuclear Structure and Decay Data Evaluators at the IAEA Headquarters, Vienna, 23 to 27 March 2009. This meeting was attended by 22 scientists from 14 Member States, plus IAEA staff, concerned with the compilation, evaluation and dissemination of nuclear structure and decay data. A summary of the meeting, recommendations/conclusions, data centre reports, and various proposals considered, modified and agreed by the participants are contained within this document. The International Network of Nuclear Structure and Decay Data (NSDD) Evaluators holds biennial meetings under the auspices of the IAEA, and consists of evaluation groups and data service centres in several countries. This network has the objective of providing up-to-date nuclear structure and decay data for all known nuclides by evaluating all existing experimental data. Data resulting from this international evaluation collaboration is included in the Evaluated Nuclear Structure Data File (ENSDF) and published in the journals Nuclear Physics A and Nuclear Data Sheets (NDS).
Date:
March 23, 2009
Creator:
Abriola, D. & Tuli, J.
Object Type:
Report
System:
The UNT Digital Library
Performance of particle in cell methods on highly concurrent computational architectures
Particle in cell (PIC) methods are effective in computing Vlasov-Poisson system of equations used in simulations of magnetic fusion plasmas. PIC methods use grid based computations, for solving Poisson’s equation or more generally Maxwell’s equations, as well as Monte-Carlo type methods to sample the Vlasov equation. The presence of two types of discretizations, deterministic field solves and Monte-Carlo methods for the Vlasov equation, pose challenges in understanding and optimizing performance on today large scale computers which require high levels of concurrency. These challenges arises from the need to optimize two very different types of processes and the interactions between them. Modern cache based high-end computers have very deep memory hierarchies and high degrees of concurrency which must be utilized effectively to achieve good performance. The effective use of these machines requires maximizing concurrency by eliminating serial or redundant work and minimizing global communication. A related issue is minimizing the memory traffic between levels of the memory hierarchy because performance is often limited by the bandwidths and latencies of the memory system. This paper discusses some of the performance issues, particularly in regard to parallelism, of PIC methods. The gyrokinetic toroidal code (GTC) is used for these studies and a new …
Date:
September 23, 2009
Creator:
Adams, M. F.; Ethier, S. & Wichmann, N.
Object Type:
Report
System:
The UNT Digital Library
Lebanon: Background and U.S. Relations
This report provides an overview of Lebanese politics, recent events in Lebanon, and current issues in U.S.-Lebanon relations and will be updated to reflect major developments.
Date:
July 23, 2009
Creator:
Addis, Casey L.
Object Type:
Report
System:
The UNT Digital Library
The Global Economic Downturn and Protectionism
This report develops three scenarios to approximate different dimensions of the relationship between the global economic downturn and protectionism. The scenarios are not predictions, but descriptions of how and why pressures for protection could be manifested and transmitted under different circumstances and assumptions.
Date:
March 23, 2009
Creator:
Ahearn, Raymond J.
Object Type:
Report
System:
The UNT Digital Library
Timpson & Tenaha News (Timpson, Tex.), Vol. 27, No. 16, Ed. 1 Thursday, April 23, 2009
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
April 23, 2009
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Timpson & Tenaha News (Timpson, Tex.), Vol. 28, No. 29, Ed. 1 Thursday, July 23, 2009
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
July 23, 2009
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Nurturing Children's Spirituality: Christian Perspectives and Best Practices
Lecture given Wednesday, September 23, 2009, 4:00 PM at Abilene Christian University: "This class explores the unfolding concept of children's spirituality, examining definitions, biblical and theological foundations and current research. It briefly overviews 10 key ways to cultivate children's spiritual development, but focuses principally on three re-orienting and profound approaches for parents and churches to consider."
Date:
September 23, 2009
Creator:
Allen, Holly
Object Type:
Sound
System:
The Portal to Texas History
Time-Dependent Measure of a Nano-Scale Force-Pulse Driven by the Axonemal Dynein Motors in Individual Live Sperm Cells
Nano-scale mechanical forces generated by motor proteins are crucial to normal cellular and organismal functioning. The ability to measure and exploit such forces would be important to developing motile biomimetic nanodevices powered by biological motors for Nanomedicine. Axonemal dynein motors positioned inside the sperm flagellum drive microtubule sliding giving rise to rhythmic beating of the flagellum. This force-generating action makes it possible for the sperm cell to move through viscous media. Here we report new nano-scale information on how the propulsive force is generated by the sperm flagellum and how this force varies over time. Single cell recordings reveal discrete {approx}50 ms pulses oscillating with amplitude 9.8 {+-} 2.6 nN independent of pulse frequency (3.5-19.5 Hz). The average work carried out by each cell is 4.6 x 10{sup -16} J per pulse, equivalent to the hydrolysis of {approx}5,500 ATP molecules. The mechanochemical coupling at each active dynein head is {approx}2.2 pN/ATP, and {approx}3.9 pN per dynein arm, in agreement with previously published values obtained using different methods.
Date:
April 23, 2009
Creator:
Allen, M J; Rudd, R E; McElfresh, M W & Balhorn, R
Object Type:
Article
System:
The UNT Digital Library
Multi-Racial and Multi-Generational Fellowships: Practicing the Presence of God in Your Ministry
Lecture given Wednesday, September 23, 2009, 10:00 AM at Abilene Christian University: "Every minister desires to seek and follow God's direction and will. Practicing the presence of God involves total dependence on God through prayer and listening to His voice. Does your church want to get to know your neighbors? Integrating begins by building relationships and continues with bridge-building into the community of faith."
Date:
September 23, 2009
Creator:
Almanza, Joe
Object Type:
Sound
System:
The Portal to Texas History
Multi-Channel Auto-Dilution System for Remote Continuous Monitoring of High Soil-CO2 Fluxes
Geological sequestration has the potential capacity and longevity to significantly decrease the amount of anthropogenic CO2 introduced into the atmosphere by combustion of fossil fuels such as coal. Effective sequestration, however, requires the ability to verify the integrity of the reservoir and ensure that potential leakage rates are kept to a minimum. Moreover, understanding the pathways by which CO2 migrates to the surface is critical to assessing the risks and developing remediation approaches. Field experiments, such as those conducted at the Zero Emissions Research and Technology (ZERT) project test site in Bozeman, Montana, require a flexible CO2 monitoring system that can accurately and continuously measure soil-surface CO2 fluxes for multiple sampling points at concentrations ranging from background levels to several tens of percent. To meet this need, PNNL is developing a multi-port battery-operated system capable of both spatial and temporal monitoring of CO2 at concentrations from ambient to at least 150,000 ppmv. This report describes the system components (sampling chambers, measurement and control system, and power supply) and the results of a field test at the ZERT site during the late summer and fall of 2008. While the system performed well overall during the field test, several improvements to the …
Date:
April 23, 2009
Creator:
Amonette, James E. & Barr, Jonathan L.
Object Type:
Report
System:
The UNT Digital Library
A Ministry for the Masses
Lecture given Wednesday, September 23, 2009, 4:00 PM at Abilene Christian University: "This session is bigger than discussing the unique opportunity of ministry to those inside the criminal justice system. Not all of the imprisoned are in prison. This session explores addictive behavior, games convicts play, stories of working with inmates for 25 years and the "how to" of ministering to convicts."
Date:
September 23, 2009
Creator:
Anderson, Freddie
Object Type:
Sound
System:
The Portal to Texas History
Doctoral Recital: 2009-11-23 - Matthew Anderson, trumpet
Recital presented at the UNT College of Music Main Auditorium in partial fulfillment of the Doctor of Musical Arts (DMA) degree.
Date:
November 23, 2009
Creator:
Anderson, Matthew
Object Type:
Sound
System:
The UNT Digital Library
Constraints on Inelastic Dark Matter from XENON10
It has been suggested that dark matter particles which scatter inelastically from detector target nuclei could explain the apparent incompatibility of the DAMA modulation signal (interpreted as evidence for particle dark matter) with the null results from CDMS-II and XENON10. Among the predictions of inelastically interacting dark matter are a suppression of low-energy events, and a population of nuclear recoil events at higher nuclear recoil equivalent energies. This is in stark contrast to the well-known expectation of a falling exponential spectrum for the case of elastic interactions. We present a new analysis of XENON10 dark matter search data extending to E{sub nr} = 75 keV nuclear recoil equivalent energy. Our results exclude a significant region of previously allowed parameter space in the model of inelastically interacting dark matter. In particular, it is found that dark matter particle masses m{sub x} {approx}> 150 GeV are disfavored.
Date:
November 23, 2009
Creator:
Angle, J; Aprile, E; Arneodo, F; Baudis, L; Bernstein, A; Bolozdynya, A et al.
Object Type:
Article
System:
The UNT Digital Library
MINOR PARAMETERS NEEDED FOR INDIVIDUAL-DOSE CALCULATIONS: Final Report for Tasks 7.1, 7.2, 8.1, 8.2, 9.1, 9.2, and 9.3
This brief report documents the selection of parameters needed to support individual-dose calculations from 131I released into the environment with gaseous effluents from the Mayak Production Association.
Date:
October 23, 2009
Creator:
Anspaugh, L. R. & Napier, Bruce A.
Object Type:
Report
System:
The UNT Digital Library
A Story of Sharing the Gospel Through Sign Language
Lecture given Wednesday, September 23, 2009, 10:00 AM at Abilene Christian University: "Come hear the minister and director of the Village of Hope orphanage in Ghana tell his story of how serving as a boy interpreter prepared him for evangelism. Sign language became a tool to deliver the gospel to a neglected and forgotten people bound by silence."
Date:
September 23, 2009
Creator:
Asare, Fred
Object Type:
Sound
System:
The Portal to Texas History
What the American Church Can Learn From the African Church
Lecture given Wednesday, September 23, 2009, 9:00 AM at Abilene Christian University: "More than 100 years ago, American missionaries began planting Churches of Christ in Africa. Since then, the African church has grown and matured. Today, African congregations outnumber American congregations and the African church continues to grow as American church declines. What lessons may American churches learn from African churches?"
Date:
September 23, 2009
Creator:
Asare, Fred
Object Type:
Sound
System:
The Portal to Texas History
The Oklahoma Daily (Norman, Okla.), Vol. 94, No. 159, Ed. 1 Tuesday, June 23, 2009
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
June 23, 2009
Creator:
Atkinson, Luke
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Oklahoma Daily (Norman, Okla.), Vol. 94, No. 170, Ed. 1 Thursday, July 23, 2009
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
July 23, 2009
Creator:
Atkinson, Luke
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Measurement of the Semileptonic Decays B->D tau nu and B->D* tau nu
The authors present measurements of the semileptonic decays B{sup -} {yields} D{sup 0} {tau}{sup -} {bar {nu}}{sub {tau}}, B{sup -} {yields} D*{sup 0} {tau}{sup -}{bar {nu}}{sub {tau}}, {bar B}{sup 0} {yields} D{sup +} {tau}{sup -} {bar {nu}}{sub {tau}}, and {bar B}{sup 0} {yields} D*{sup +} {tau}{sup -}{bar {nu}}{sub {tau}}, which are sensitive to non-Standard Model amplitudes in certain scenarios. The data sample consists of 232 x 10{sup 6} {Upsilon}(4S) {yields} B{bar B} decays collected with the BABAR detector at the PEP-II e{sup +}e{sup -} collider. They select events with a D or D* meson and a light lepton ({ell} = e or {mu}) recoiling against a fully reconstructed B meson. They perform a fit to the joint distribution of lepton momentum and missing mass squared to distinguish signal B {yields} D{sup (*)}{tau}{sup -} {bar {nu}}{sub {tau}} ({tau}{sup -} {yields} {ell}{sup -} {bar {nu}}{sub {ell}}{nu}{sub {tau}}) events from the backgrounds, predominantly B {yields} D{sup (*)} {ell}{sup -}{bar {nu}}{sub {ell}}. They measure the branching-fraction ratios R(D) {triple_bond} {Beta}(B {yields} D{tau}{sup -} {bar {nu}}{sub {tau}})/{Beta}(B {yields} D{ell}{sup -} {bar {nu}}{sub {ell}}) and R(D*) {triple_bond} {Beta}(B {yields} D*{tau}{sup -} {bar {nu}}{sub {tau}})/{Beta}(B {yields} D* {ell}{sup -} {bar {nu}}{sub {ell}}) and, from a combined fit …
Date:
February 23, 2009
Creator:
Aubert, B.
Object Type:
Article
System:
The UNT Digital Library
Search for the decay B^+ \to K_S^0 K_S^0 \pi ^+
The authors search for charmless decays of charged B mesons to the three-body final state K{sub S}{sup 0}K{sub S}{sup 0}{pi}{sup +}. Using a data sample of 423.7 fb{sup -1} collected at the {Upsilon}(4S) resonance with the BABAR detector, corresponding to (465.1 {+-} 5.1) x 10{sup 6} B{bar B} pairs, they find no significant signal and determine a 90% confidence level upper limit on the branching fraction of 5.1 x 10{sup -7}.
Date:
February 23, 2009
Creator:
Aubert, B.; Bona, M.; Karyotakis, Y.; Lees, J. P.; Poireau, V.; Prencipe, E. et al.
Object Type:
Article
System:
The UNT Digital Library
Building America Best Practices Series, Volume 9: Builders Challenge Guide to 40% Whole-House Energy Savings in the Hot-Dry and Mixed-Dry Climates
This best practices guide is the ninth in a series of guides for builders produced by the U.S. Department of Energy’s Building America Program. This guide book is a resource to help builders design and construct homes that are among the most energy-efficient available, while addressing issues such as building durability, indoor air quality, and occupant health, safety, and comfort. With the measures described in this guide, builders in the hot-dry and mixed-dry climates can achieve homes that have whole house energy savings of 40% over the Building America benchmark (a home built to mid-1990s building practices roughly equivalent to the 1993 Model Energy Code) with no added overall costs for consumers. These best practices are based on the results of research and demonstration projects conducted by Building America’s research teams. The guide includes information for managers, designers, marketers, site supervisors, and subcontractors, as well as case studies of builders who are successfully building homes that cut energy use by 40% in the hot-dry and mixed-dry climates.
Date:
October 23, 2009
Creator:
Baechler, Michael C.; Gilbride, Theresa L.; Hefty, Marye G.; Williamson, Jennifer L.; Ruiz, Kathleen A.; Bartlett, Rosemarie et al.
Object Type:
Report
System:
The UNT Digital Library
Research Opportunities in High Energy Density Laboratory Plasmas on the NDCX-II Facility
Intense beams of heavy ions offer a very attractive tool for fundamental research in high energy density physics and inertial fusion energy science. These applications build on the significant recent advances in the generation, compression and focusing of intense heavy ion beams in the presence of a neutralizing background plasma. Such beams can provide uniform volumetric heating of the target during a time-scale shorter than the hydrodynamic response time, thereby enabling a significant suite of experiments that will elucidate the underlying physics of dense, strongly-coupled plasma states, which have been heretofore poorly understood and inadequately diagnosed, particularly in the warm dense matter regime. The innovations, fundamental knowledge, and experimental capabilities developed in this basic research program is also expected to provide new research opportunities to study the physics of directly-driven ion targets, which can dramatically reduce the size of heavy ion beam drivers for inertial fusion energy applications. Experiments examining the behavior of thin target foils heated to the warm dense matter regime began at the Lawrence Berkeley National Laboratory in 2008, using the Neutralized Drift Compression Experiment - I (NDCX-I) facility, and its associated target chamber and diagnostics. The upgrade of this facility, called NDCX-II, will enable an exciting …
Date:
March 23, 2009
Creator:
Barnard, John; Cohen, Ron; Friedman, Alex; Grote, Dave; Lund, Steven; Sharp, Bill et al.
Object Type:
Report
System:
The UNT Digital Library
Called to the Mountaintop: Developing the Leadership Potential in Others
Lecture given Wednesday, September 23, 2009, 9:00 AM at Abilene Christian University: "Do you feel called to leadership? Do you feel called to develop leadership potential in others? This session will offer real-life examples of personal leadership development experiences and current best practices for leadership development."
Date:
September 23, 2009
Creator:
Barnard, Mimi
Object Type:
Sound
System:
The Portal to Texas History