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Office of Scientific & Technical Information Technical Reports
176
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145
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119
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Results:
1 - 24 of
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QUESTIONNAIRE ON THE CAPABILITIES OF MEMBER STATES REGARDING THE ANALYSIS OF BIOMEDICAL SAMPLES
None
Date:
March 27, 2006
Creator:
Alcaraz, A. & Gregg, H.
Object Type:
Report
System:
The UNT Digital Library
Timpson & Tenaha News (Timpson, Tex.), Vol. 21, No. 39, Ed. 1 Thursday, July 27, 2006
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
July 27, 2006
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Timpson & Tenaha News (Timpson, Tex.), Vol. 22, No. 17, Ed. 1 Thursday, April 27, 2006
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
April 27, 2006
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Bulk Properties of Iron Isotopes
Nuclear level densities and radiative strength functions (RSF) in {sup 56}Fe and {sup 57}Fe were measured using the {sup 57}Fe({sup 3}He,{alpha}{gamma}) and {sup 57}Fe({sup 3}He, {sup 3}He{prime}{gamma}) reactions, respectively, at Oslo Cyclotron Laboratory. A low-energy enhancement in the RSF below 4 MeV energy was observed. This finding cannot be explained by common theoretical models. In a second experiment, two-step cascade intensities with soft primary transitions from the {sup 56}Fe(n,2{gamma}) reaction were measured. The agreement between the two experiments confirms the low-energy enhancement in the RSF. In a third experiment, the neutron evaporation spectrum from the {sup 55}Mn(dn,N){sup 56}Fe reaction was measured at 7-MeV deuteron energy at John Edwards Accelerator Laboratory at Ohio University. Comparison of the level density of {sup 56}Fe obtained from the first and third experiments gives an overall good agreement. Furthermore, observed enhancement for soft {gamma} rays is supported by the last experiment.
Date:
July 27, 2006
Creator:
Algin, E.; Schiller, A.; Voinov, A.; Agvannluvsan, U.; Belgya, T.; Bernstein, L. et al.
Object Type:
Article
System:
The UNT Digital Library
Renewal, Modulation, and Superstatistics in Times Series
Article discussing two different approaches, referred to as renewal and modulation, to generate time series with a nonexponential distribution of waiting times.
Date:
April 27, 2006
Creator:
Allegrini, Paolo; Barbi, Francesco; Grigolini, Paolo & Paradisi, Paolo
Object Type:
Article
System:
The UNT Digital Library
Congressional Record: Its Production, Distribution, and Accessibility
This report briefly discusses how the Congressional Record is created and distributed. The Congressional Record is the most widely recognized published account of the debates and activities in Congress and it often reflects the intent of Congress in enacting legislation.
Date:
October 27, 2006
Creator:
Amer, Mildred
Object Type:
Report
System:
The UNT Digital Library
House and Senate Chaplains
None
Date:
October 27, 2006
Creator:
Amer, Mildred
Object Type:
Report
System:
The UNT Digital Library
Secret Sessions of Congress: A Brief Historical Overview
"Secret" or "closed door" sessions of the House of Representatives and Seante are held periodically to discuss business, including impeachment deliberations, deemed to require confidentiality and secrecy. Authority for the two chambers to hold these sessions is implied by Article I, Section 5, of the Constitution. National Security is the principal reason for such sessions in recent years. This report provides a historical background of such sessions, as well as relevant regulations and expectations for Members of Congress during such sessions.
Date:
September 27, 2006
Creator:
Amer, Mildred
Object Type:
Report
System:
The UNT Digital Library
Secret Sessions of Congress: A Brief Historical Overview
None
Date:
September 27, 2006
Creator:
Amer, Mildred L.
Object Type:
Report
System:
The UNT Digital Library
Simulation of BaBar Drift Chamber
The BaBar drift chamber (DCH) is used to measure the properties of charged particles created from e{sup +}e{sup -} collisions in the PEP-II asymmetric-energy storage rings by making precise measurements of position, momentum and ionization energy loss (dE/dx). In October of 2005, the PEP-II storage rings operated with a luminosity of 10 x 10{sup 33} cm{sup -2}s{sup -1}; the goal for 2007 is a luminosity of 20 x 10{sup 33} cm{sup -2}s{sup -1}, which will increase the readout dead time, causing uncertainty in drift chamber measurements to become more significant in physics results. The research described in this paper aims to reduce position and dE/dx uncertainties by improving our understanding of the BaBar drift chamber performance. A simulation program--called GARFIELD--is used to model the behavior of the drift chamber with adjustable parameters such as gas mixture, wire diameter, voltage, and magnetic field. By exploring the simulation options offered in GARFIELD, we successfully produced a simulation model of the BaBar drift chamber. We compared the time-to-distance calibration from BaBar to that calculated by GARFIELD to validate our model as well as check for discrepancies between the simulated and calibrated time-to-distance functions, and found that for a 0{sup o} entrance angle there …
Date:
September 27, 2006
Creator:
Anderson, Rachel & /Wisconsin U., Eau Claire /SLAC
Object Type:
Report
System:
The UNT Digital Library
Deployment and Operation of the ES-3100 Type B Shipping Container
The U.S. Department of Energy (DOE) National Nuclear Security Administration (NNSA) is shipping, for disposition purposes, bulk quantities of fissile materials, primarily highly enriched uranium (HEU). The U.S. Department of Transportation (DOT) specification 6M container has been the workhorse for NNSA and many other shippers of radioactive material since the 1980s. However, the 6M does not conform to the packaging requirements in the Code of Federal Regulations (10 CFR 71) and, for that reason, is being phased out for use in the DOE secure transportation system by the end of 2006. BWXT Y-12 developed and licensed the ES-3100 container to replace the DOT 6M. The ES-3100 was certified by the Nuclear Regulatory Commission (NRC) in April 2006. The process of deploying the new package began in June 2005 and is planned to be completed in July 2006. The package will be fully operational and completely replace the DOT 6M at the Y-12 National Security Complex (Y-12) by October 2006. This paper reviews the deployment process and the mock loading station that was installed at National Transportation Research Center (NTRC) of Oak Ridge National Laboratory. Specialized equipment, tools, and instrumentation that support the handling and loading operations of the ES-3100 are …
Date:
July 27, 2006
Creator:
Arbital, J. G. & Tousley, D. R.: Miller, D. B.
Object Type:
Report
System:
The UNT Digital Library
Northern Ireland: The Peace Process
For years, the British and Irish governments have sought to facilitate a peaceful settlement to the conflict in Northern Ireland. After many ups and downs, the two government and the parties participating in the peace talks announced an agreement on April 10, 1998. The implementation of the resulting Good Friday Agreement continues to be difficult. A political stalemate in Northern Ireland since 2002 has halted the peace process and forced London to suspend the devolved government and to resume governance of the province. British and Irish leaders have set a November 24, 2006, deadline to revive talks on governance in Northern Ireland.
Date:
September 27, 2006
Creator:
Archick, Kristin & Morelli, Vince L.
Object Type:
Report
System:
The UNT Digital Library
A Catalog of Candidate High-redshift Blazars for GLAST
High-redshift blazars are promising candidates for detection by the Gamma-ray Large Area Space Telescope (GLAST). GLAST, expected to be launched in the Fall of 2007, is a high-energy gamma-ray observatory designed for making observations of celestial gamma-ray sources in the energy band extending from 10 MeV to more than 200 GeV. It is estimated that GLAST will find several thousand blazars. The motivations for measuring the gamma-ray emission from distant blazars include the study of the high-energy emission processes occurring in these sources and an indirect measurement of the extragalactic background light. In anticipation of the launch of GLAST we have compiled a catalog of candidate high-redshift blazars. The criteria for sources chosen for the catalog were: high radio emission, high redshift, and a flat radio spectrum. A preliminary list of 307 radio sources brighter than 70mJy with a redshift z {ge} 2.5 was acquired using data from the NASA Extragalactic Database. Flux measurements of each source were obtained at two or more radio frequencies from surveys and catalogs to calculate their radio spectral indices {alpha}. The sources with a flat-radio spectrum ({alpha} {le} 0.5) were selected for the catalog, and the final catalog includes about 200 sources.
Date:
September 27, 2006
Creator:
Arias, Tersi M. & U., /SLAC /San Francisco State
Object Type:
Report
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
Surface structure of CdSe Nanorods revealed by combined X-rayabsorption fine structure measurements and ab-initio calculations
We report orientation-specific, surface-sensitive structural characterization of colloidal CdSe nanorods with extended X-ray absorption fine structure spectroscopy and ab-initio density functional theory calculations. Our measurements of crystallographically-aligned CdSe nanorods show that they have reconstructed Cd-rich surfaces. They exhibit orientation-dependent changes in interatomic distances which are qualitatively reproduced by our calculations. These calculations reveal that the measured interatomic distance anisotropy originates from the nanorod surface.
Date:
January 27, 2006
Creator:
Aruguete, Deborah A.; Marcus, Matthew A.; Li, Liang-shi; Williamson, Andrew; Fakra, Sirine; Gygi, Francois et al.
Object Type:
Article
System:
The UNT Digital Library
Doctoral Recital: 2006-02-27 – Christopher Astilla, piano
Recital presented at the UNT College of Music Recital Hall in partial fulfillment of the Doctor of Musical Arts (DMA) degree
Date:
February 27, 2006
Creator:
Astilla, Christopher
Object Type:
Sound
System:
The UNT Digital Library
Observation of B0 Meson Decays to a1(1260)+- pi-+
The authors present a measurement of the branching fraction of the decay B{sup 0} {yields} a{sub 1}{sup {+-}}(1260){pi}{sup {-+}} with a{sub 1}{sup {+-}}(1260) {yields} {pi}{sup {-+}}{pi}{sup {+-}}{pi}{sup {+-}}. The data sample corresponds to 218 x 10{sup 6} B{bar B} pairs produced in e{sup +}e{sup -} annihilation through the {Upsilon}(4S) resonance. The authors measure the branching fraction {Beta}(B{sup 0} {yields} a{sub 1}{sup {+-}}(1260){pi}{sup {-+}}){Beta}(a{sub 1}{sup {+-}}(1260){yields} {pi}{sup {-+}}{pi}{sup {+-}}{pi}{sup {+-}})=(16.6 {+-} 1.9 {+-} 1.5) x 10{sup -6}, where the first error quoted is statistical and the second is systematic.
Date:
March 27, 2006
Creator:
Aubert, B.
Object Type:
Report
System:
The UNT Digital Library
Observation of e+e- Annihilations into the C=+1 Hadronic Final States \rho^0\rho^0 and \phi\rho^0
The authors report the first observation of e{sup +}e{sup -} annihilations into states of positive C-parity, namely {rho}{sup 0}{rho}{sup 0} and {phi}{rho}{sup 0}. The two states are observed in the {pi}{sup +}{pi}{sup -}{pi}{sup +}{pi}{sup -} and K{sup +}K{sup -} {pi}{sup +}{pi}{sup -} final states, respectively, in a data sample of 225 fb{sup -1} collected by the BABAR experiment at the PEP-II e{sup +}e{sup -} storage rings at energies near {radical}s = 10.58 GeV. The distributions of cos {theta}*, where {theta}* is the center-of-mass polar angle of the {phi} meson or the forward {rho}{sup 0} meson, suggest production by two-virtual-photon annihilation. They measure cross sections within the range |cos {theta}*| < 0.8 of {sigma}(e{sup +}e{sup -} {yields} {rho}{sup 0} {rho}{sup 0}) = 20.7 {+-} 0.7(stat) {+-} 2.7(syst) fb and {sigma}(e{sup +}e{sup -} {yields} {phi}{rho}{sup 0}) = 5.7 {+-} 0.5(stat) {+-} 0.8(syst) fb.
Date:
June 27, 2006
Creator:
Aubert, B.
Object Type:
Report
System:
The UNT Digital Library
A Search for the B^0 to e^+ e^- \gamma and B^0 to \mu^+ \mu^- \gamma Decays
With the BABAR detector at the PEP-II asymmetric B Factory at SLAC, they present the first search for the decays B{sup 0} {yields} {ell}{sup +}{ell}{sup -}{gamma} ({ell} = e, {mu}). Using a data set of 292 fb{sup -1} collected at the {Upsilon}(4S) resonance, they find no significant signal and set the following branching fraction upper limits at 90% confidence level: {Beta}(B{sup 0} {yields} e{sup +}e{sup -}{gamma}) < 0.7 x 10{sup -7} and {Beta}(B{sup 0} {yields} {mu}{sup +}{mu}{sup -}{gamma}) < 3.4 x 10{sup -7}.
Date:
September 27, 2006
Creator:
Aubert, B.
Object Type:
Article
System:
The UNT Digital Library
Search for the decay B^0 --> K^0_S K^0_S K^0_L
The authors present the first search for the decay B{sup 0} {yields} K{sub S}{sup 0} K{sub S}{sup 0} K{sub L}{sup 0} using a data sample of 232 million B{bar B} pairs. They find no statistically significant evidence for the non-resonant component of this decay. Our central value for the branching fraction, assuming the tru Dalitz distribution is uniform and excluding the {phi} resonance, is {Beta}(B{sup 0} {yields} K{sub S}{sup 0} K{sub S}{sup 0} K{sub L}{sup 0}) = (2.4{sub -2.5}{sup +2.7} {+-} 0.6) x 10{sup -6} where the errors are statistical and systematic, respectively. They set a single-side Bayesian upper limit of {Beta}(B{sup 0} {yields} K{sub S}{sup 0} K{sub S}{sup 0} K{sub L}{sup 0}) < 6.4 x 10{sup -6} at 90% confidence level using a uniform prior probability for physical values. Assuming the worst-case true Dalitz distribution, where the signal is entirely in the region of lowest efficiency, the 90% confidence level upper limit is {Beta}(B{sup 0} {yields} K{sub S}{sup 0} K{sub S}{sup 0} K{sub L}{sup 0}) < 14 x 10{sup -6}.
Date:
June 27, 2006
Creator:
Aubert, B.
Object Type:
Report
System:
The UNT Digital Library
Search for the decay of a B0 or B0bar meson to K*0bar K0 or K*0 K0bar
The authors present a search for the decay of a B{sup 0} or {bar B}{sup 0} meson to a {bar K}*{sup 0} K{sup 0} or K*{sup 0} {bar K}{sup 0} final state, using a sample of approximately 232 million B{bar B} events collected with the BABAR detector at the PEP-II asymmetric energy e{sup +}e{sup -} collider at SLAC. The measured branching fraction is {Beta}(B{sup 0} {yields} {bar K}*{sup 0} K{sup 0}) + {Beta}(B{sup 0} {yields} K*{sup 0} {bar K}{sup 0}) = (0.2{sub -0.8, -0.3}{sup +0.9, +0.1}) x 10{sup -6}. They obtain the following upper limit for the branching fraction at 90% confidence level: {Beta}(B{sup 0} {yields} {bar K}*{sup 0} K{sup 0}) + {Beta}(B{sup 0} {yields} K*{sup 0} {bar K}{sup 0}) < 1.9 x 10{sup -6}. They use our result to constrain the Standard Model prediction for the deviation of the CP asymmetry in B{sup 0} {yields} {phi}K{sup 0} from sin 2{beta}.
Date:
June 27, 2006
Creator:
Aubert, B.
Object Type:
Report
System:
The UNT Digital Library
The Two-loop Anomalous Dimension Matrix for Soft Gluon Exchange
The resummation of soft gluon exchange for QCD hard scattering requires a matrix of anomalous dimensions. We compute this matrix directly for arbitrary 2 {yields} n massless processes for the first time at two loops. Using color generator notation, we show that it is proportional to the one-loop matrix. This result reproduces all pole terms in dimensional regularization of the explicit calculations of massless 2 {yields} 2 amplitudes in the literature, and it predicts all poles at next-to-leading order in any 2 {yields} n process that has been computed at next-to-leading order. The proportionality of the one- and two-loop matrices makes possible the resummation in closed form of the next-to-next-to-leading logarithms and poles in dimensional regularization for the 2 {yields} n processes.
Date:
June 27, 2006
Creator:
Aybat, S.Mert; Dixon, Lance J. & Sterman, George
Object Type:
Report
System:
The UNT Digital Library
Heavy Quarks
None
Date:
March 27, 2006
Creator:
Baines, J.; Baranov, S. P.; Behnke, O.; Bracinfk, J.; Cacciari, M.; Corradi, M. et al.
Object Type:
Article
System:
The UNT Digital Library
The Silicon Tracker Readout Electronics of the Gamma-ray Large Area Space Telescope
A unique electronics system has been built and tested for reading signals from the silicon-strip detectors of the Gamma-ray Large Area Space Telescope mission. The system amplifies and processes signals from 884,736 36-cm strips using only 160 W of power, and it achieves close to 100% detection efficiency with noise occupancy sufficiently low to allow it to self trigger. The design of the readout system is described, and results are presented from ground-based testing of the completed detector system.
Date:
February 27, 2006
Creator:
Baldini, Luca; Brez, Alessandro; Himel, Thomas; Hirayama, Masaharu; Johnson, R. P.; Kroeger, Wilko et al.
Object Type:
Article
System:
The UNT Digital Library