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1,020 Matching Results
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Identification of Matrix Conditions that Give Rise to the Linear Coupling Resonances
N/A
Date:
March 1, 2009
Creator:
Gardner, C. J.
Object Type:
Report
System:
The UNT Digital Library
Identification of matrix conditions that give rise to the linear coupling resonances
General definitions of horizontal and vertical amplitudes for linear coupled motion are developed from the normal form of the one-turn matrix. This leads to the identification of conditions on the matrix that give rise to the linear coupling sum and difference resonances. The correspondence with the standard hamiltonian treatment of the resonances is discussed.
Date:
March 1, 2009
Creator:
Gardner,C.J.
Object Type:
Report
System:
The UNT Digital Library
The J-TAC (Stephenville, Tex.), Vol. 181, No. 12, Ed. 1 Thursday, April 23, 2009
Weekly student newspaper from Tarleton State University in Stephenville, Texas that includes local, state and campus news along with advertising.
Date:
April 23, 2009
Creator:
Cedeno, Michael
Object Type:
Newspaper
System:
The Portal to Texas History
Recess Appointments Made by President George W. Bush
None
Date:
April 15, 2009
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
SUPPORTING SAFE STORAGE OF PLUTONIUM-BEARING MATERIALS THROUGH SCIENCE, ENGINEERING AND SURVEILLANCE
Reductions in the size of the U. S. nuclear weapons arsenal resulted in the need to store large quantities of plutonium-bearing metals and oxides for prolonged periods of time. To assure that the excess plutonium from the U. S. Department of Energy (DOE) sites was stored in a safe and environmentally friendly manner the plutonium-bearing materials are stabilized and packaged according to well developed criteria published as a DOE Standard. The packaged materials are stored in secure facilities and regular surveillance activities are conducted to assure continuing package integrity. The stabilization, packaging, storage and surveillance requirements were developed through extensive science and engineering activities including those related to: plutonium-environment interactions and container pressurization, corrosion and stress corrosion cracking, plutonium-container material interactions, loss of sealing capability and changes in heat transfer characteristics. This paper summarizes some of those activities and outlines ongoing science and engineering programs that assure continued safe and secure storage of the plutonium-bearing metals and oxides.
Date:
November 10, 2009
Creator:
Dunn, K.; Chandler, G.; Gardner, C.; Louthan, M. & Mcclard, J.
Object Type:
Article
System:
The UNT Digital Library
TMTI Task 1.6 Genetic Engineering Methods and Detection
A large number of GE techniques can be adapted from other microorganisms to biothreat bacteria and viruses. Detection of GE in a microorganism increases in difficulty as the size of the genetic change decreases. In addition to the size of the engineered change, the consensus genomic sequence of the microorganism can impact the difficulty of detecting an engineered change in genomes that are highly variable from strain to strain. This problem will require comprehensive databases of whole genome sequences for more genetically variable biothreat bacteria and viruses. Preliminary work with microarrays for detecting synthetic elements or virulence genes and analytic bioinformatic approaches for whole genome sequence comparison to detect genetic engineering show promise for attacking this difficult problem but a large amount of future work remains.
Date:
December 4, 2009
Creator:
Slezak, T.; Lenhoff, R.; Allen, J.; Borucki, M.; Vitalis, E. & Gardner, S.
Object Type:
Report
System:
The UNT Digital Library
Dark Matter Constraints from a Cosmic Index of Refraction
The dark-matter candidates of particle physics invariably possess electromagnetic interactions, if only via quantum fluctuations. Taken en masse, dark matter can thus engender an index of refraction which deviates from its vacuum value. Its presence is signaled through frequency-dependent effects: the real part yields dispersive effects in propagation, and the imaginary part yields such in attenuation. We discuss theoretical constraints on the expansion of the index of refraction with frequency, the physical interpretation of the terms, and the particular observations needed to isolate its coefficients. This, with the advent of new opportunities to view gamma-ray bursts at cosmological distance scales, gives us a new probe of dark matter. As a first application we use the time delay determined from radio afterglow observations of gamma-ray bursts to limit the charge-to-mass ratio of dark matter to |{var_epsilon}|/M < 1.8 x 10{sup -5} eV{sup -1} at 95% CL.
Date:
April 1, 2009
Creator:
Gardner, Susan & Latimer, David C.
Object Type:
Article
System:
The UNT Digital Library
Distributed Wind Energy in Idaho
This project is a research and development program aimed at furthering distributed wind technology. In particular, this project addresses some of the barriers to distributed wind energy utilization in Idaho.
Date:
January 31, 2009
Creator:
Gardner, John; Johnson, Kathryn; Haynes, Todd & Seifert, Gary
Object Type:
Report
System:
The UNT Digital Library
Polarized proton performance of AGS in run 8 operation
None
Date:
May 4, 2009
Creator:
Huang, H.; Ahrens, L.; Bai, M.; Brown, K. A.; Gardner, C.; Glenn, J. W. et al.
Object Type:
Article
System:
The UNT Digital Library
Compendium of Avian Occurrence Information for the Continental Shelf Waters along the Atlantic Coast of the United States: Final Report (Database Section-Seabirds)
This study follows the regulatory requirements by the MMS and FWS in assessing the construction of building and wind turbines effects on marine bird populations.
Date:
July 2009
Creator:
O'Connell, Allan; Gardner, Beth; Gilbert, Andrew & Laurent, Kevin
Object Type:
Text
System:
The UNT Digital Library
A quasilinear model for solute transport under unsaturated flow
We developed an analytical solution for solute transport under steady-state, two-dimensional, unsaturated flow and transport conditions for the investigation of high-level radioactive waste disposal. The two-dimensional, unsaturated flow problem is treated using the quasilinear flow method for a system with homogeneous material properties. Dispersion is modeled as isotropic and is proportional to the effective hydraulic conductivity. This leads to a quasilinear form for the transport problem in terms of a scalar potential that is analogous to the Kirchhoff potential for quasilinear flow. The solutions for both flow and transport scalar potentials take the form of Fourier series. The particular solution given here is for two sources of flow, with one source containing a dissolved solute. The solution method may easily be extended, however, for any combination of flow and solute sources under steady-state conditions. The analytical results for multidimensional solute transport problems, which previously could only be solved numerically, also offer an additional way to benchmark numerical solutions. An analytical solution for two-dimensional, steady-state solute transport under unsaturated flow conditions is presented. A specific case with two sources is solved but may be generalized to any combination of sources. The analytical results complement numerical solutions, which were previously required to …
Date:
May 15, 2009
Creator:
Houseworth, J.E. & Leem, J.
Object Type:
Article
System:
The UNT Digital Library
Biochemistry and genetics of autotrophy in Methanococcus
The project investigated fundamental aspects of carbon metabolism and genetics in the methane-producing archaeon Methanococcus maripaludis. The project yielded 23 peer-reviewed publications and five reviews from 1997-2007. PDFs of the peer-reviewed publications are included in the next section. Some papers of special interest are listed below. The pathway of pyruvate biosynthesis was elucidated by a combination of biochemical and physiological studies. This work characterized the very oxygen sensitive pyruvate oxidoreductase and showed that the enzyme was irreversible under physiological conditions. Evidence for the flow of electrons from the energy coupling hydrogenase b (Ehb) was presented. These results were published in the following papers. Yang, Y.L., J.N. Gluska, and W.B. Whitman (2002) Intracellular pyruvate flux in the methane-producing archaeon Methanococcus maripaludis. Arch. Microbiol. 178: 493-498. Lin, W.C., Y.L. Yang, and W.B. Whitman (2003) The anabolic pyruvate oxidoreductase from Methanococcus maripaludis. Arch. Microbiol. 179: 444-456. Lin, W., and W.B. Whitman (2004) The importance of porE and porF in the anabolic pyruvate oxidoreductase of Methanococcus maripaludis. Arch. Microbiol. 181: 68-73. Porat, I., W. Kim, E.L. Hendrickson, Q. Xia, Y. Zhang, T. Wang, F. Taub, B.C. Moore, I.J. Anderson, M. Hackett, J.A. Leigh, and W.B. Whitman (2006) Disruption of the Ehb hydrogenase operon limits …
Date:
March 31, 2009
Creator:
Whitman, William B.
Object Type:
Report
System:
The UNT Digital Library
The Clifton Record (Clifton, Tex.), Vol. 114, No. 23, Ed. 1 Wednesday, June 10, 2009
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
June 10, 2009
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
State of the Climate in 2008
This report describes observations of precipitation, temperature, and other climatology metrics from different global regions.
Date:
August 2009
Creator:
Peterson, T. C.; Baringer, M. O.; Diamond, H. J.; Fogt, R. L.; Levy, J. M.; Richter-Menge, J. et al.
Object Type:
Text
System:
The UNT Digital Library
The Clifton Record (Clifton, Tex.), Vol. 114, No. 21, Ed. 1 Wednesday, May 27, 2009
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
May 27, 2009
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 114, No. 9, Ed. 1 Wednesday, March 4, 2009
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
March 4, 2009
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 114, No. 20, Ed. 1 Wednesday, May 20, 2009
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
May 20, 2009
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 114, No. 24, Ed. 1 Wednesday, June 17, 2009
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
June 17, 2009
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 114, No. 30, Ed. 1 Wednesday, July 29, 2009
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
July 29, 2009
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 114, No. 14, Ed. 1 Wednesday, April 8, 2009
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
April 8, 2009
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 114, No. 18, Ed. 1 Wednesday, May 6, 2009
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
May 6, 2009
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 114, No. 41, Ed. 1 Wednesday, October 14, 2009
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
October 14, 2009
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
Scholarly Electronic Publishing Bibliography: 2008 Annunal Edition
This bibliography lists citations of English-language articles, books and other printed and electronic sources that are useful in understanding scholarly electronic publishing efforts on the Internet. Most sources have been published from 1990 through 2008; however, a limited number of key sources published prior to 1990 are also included.
Date:
2009
Creator:
Bailey, Charles W.
Object Type:
Text
System:
The UNT Digital Library
Novel High Transverse Momentum Phenomena in Hadronic and Nuclear Collisions
I discuss a number of novel phenomenological features of QCD in high transverse momentum reactions. The presence of direct higher-twist processes, where a proton is produced directly in the hard subprocess, can explain the 'baryon anomaly' - the large proton-to-pion ratio seen at RHIC in high centrality heavy ion collisions. Direct hadronic processes can also account for the deviation from leading-twist PQCD scaling at fixed x{sub T} = 2 p{sub T}/{radical}s. I suggest that the 'ridge' --the same-side long-range rapidity correlation observed at RHIC in high centrality heavy ion collisions is due to the imprint of semihard DGLAP gluon radiation from initial-state partons which have transverse momenta biased toward the trigger. A model for early thermalization of the quark-gluon medium is also outlined. Rescattering interactions from gluon-exchange, normally neglected in the parton model, have a profound effect in QCD hard-scattering reactions, leading to leading-twist single-spin asymmetries, diffractive deep inelastic scattering, diffractive hard hadronic reactions, the breakdown of the Lam-Tung relation in Drell-Yan reactions, nuclear shadowing--all leading-twist dynamics not incorporated in the light-front wavefunctions of the target computed in isolation. Anti shadowing is shown to be quark flavor specific and thus different in charged and neutral deep inelastic lepton-nucleus scattering. I …
Date:
April 10, 2009
Creator:
Brodsky, Stanley J.
Object Type:
Article
System:
The UNT Digital Library