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Observation of Polarized Positrons from an Undulator-Based Source
An experiment (E166) at the Stanford Linear Accelerator Center (SLAC) has demonstrated a scheme in which a multi-GeV electron beam passed through a helical undulator to generate multi-MeV, circularly polarized photons which were then converted in a thin target to produce positrons (and electrons) with longitudinal polarization above 80% at 6 MeV. The results are in agreement with Geant4 simulations that include the dominant polarization-dependent interactions of electrons, positrons and photons in matter.
Date:
March 6, 2008
Creator:
Alexander, G; Barley, J.; Batygin, Y.; Berridge, S.; Bharadwaj, V.; Bower, G. et al.
Object Type:
Article
System:
The UNT Digital Library
Timpson & Tenaha News (Timpson, Tex.), Vol. 26, No. 10, Ed. 1 Thursday, March 6, 2008
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
March 6, 2008
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Altus Times (Altus, Okla.), Vol. 106, No. 283, Ed. 1 Sunday, March 6, 2005
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
March 6, 2005
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Northern Ireland: The Peace Process
None
Date:
March 6, 2006
Creator:
Archick, Kristin
Object Type:
Report
System:
The UNT Digital Library
Oral History Interview with Clifford Ashby, March 6, 2007
The National Museum of the Pacific War presents an oral interview with Clifford Ashby. Ashby was born in Effingham, Illinois on 11 June 1925. He became interested in amateur radio while in high school and joined the Merchant Marines in 1943. After passing tests related to radio operations he was assigned to the liberty ship, SS James B. Francis (1942) as a radio operator. He tells of the ship loaded with ammunition sitting in the harbor at Guadalcanal with hoses pumping water on the deck to keep it cool. He also observed Japanese air raids over the island of Morotai. Ashby’s ship also participated in the invasion of Luzon. Later, he was assigned to the SS Benjamin Grierson commenting on the excellent food served aboard Liberty ships. He comments on the excellent wages paid to Merchant seaman and the fact that the pay was doubled when the ship was within a war zone. He tells of the SS Grierson setting at Ulithi with 40 other merchant ships for three months following the Japanese surrender. After leaving the Merchant Marine he attended various colleges and he comments on his career prior to retirement.
Date:
March 6, 2007
Creator:
Ashby, Clifford
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with Clifford Ashby, March 6, 2007
The National Museum of the Pacific War presents an oral interview with Clifford Ashby. Ashby was born in Effingham, Illinois on 11 June 1925. He became interested in amateur radio while in high school and joined the Merchant Marines in 1943. After passing tests related to radio operations he was assigned to the liberty ship, SS James B. Francis (1942) as a radio operator. He tells of the ship loaded with ammunition sitting in the harbor at Guadalcanal with hoses pumping water on the deck to keep it cool. He also observed Japanese air raids over the island of Morotai. Ashby’s ship also participated in the invasion of Luzon. Later, he was assigned to the SS Benjamin Grierson commenting on the excellent food served aboard Liberty ships. He comments on the excellent wages paid to Merchant seaman and the fact that the pay was doubled when the ship was within a war zone. He tells of the SS Grierson setting at Ulithi with 40 other merchant ships for three months following the Japanese surrender. After leaving the Merchant Marine he attended various colleges and he comments on his career prior to retirement.
Date:
March 6, 2007
Creator:
Ashby, Clifford
Object Type:
Text
System:
The Portal to Texas History
First Observation of B+ to rho+ K0 and Measurement of its Branching Fraction and Charge Asymmetry
We present the first observation of the decay B{sup +} {yields} {rho}{sup +}K{sup 0}, using a data sample of 348 fb{sup -1} collected at the {Upsilon}(4S) resonance with the BABAR detector. The branching fraction and charge asymmetry are measured to be (8.0{sub -1.3}{sup +1.4} {+-} 0.5) x 10{sup -6} and (-12.2 {+-} 16.6 {+-} 2.0)%, respectively, where the first uncertainty is statistical and the second is systematic. The significance of the observed branching fraction, including systematic uncertainties, is 7.9 standard deviations.
Date:
March 6, 2007
Creator:
Aubert, B.
Object Type:
Article
System:
The UNT Digital Library
Measurement of CP Asymmetries in B0 to K0S K0S K0S Decays
The authors present measurements of the time-dependent CP-violating asymmetries in B{sup 0} {yields} K{sub S}{sup 0}K{sub S}{sup 0}K{sub S}{sup 0} decays based on 384 million {Upsilon}(4S) {yields} B{bar B} decays collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. They obtain the CP asymmetry parameters C = 0.02 {+-} 0.21 {+-} 0.05 and S = -0.71 {+-} 0.24 {+-} 0.04, where the first uncertainties are statistical and the second systematic. These results are consistent with standard model expectations.
Date:
March 6, 2007
Creator:
Aubert, B.
Object Type:
Article
System:
The UNT Digital Library
Measurement of CP-Violating Asymmetries in B0 to (rho pi)0 using a Time-Dependent Dalitz Plot Analysis
We report a measurement of CP-violating asymmetries in B{sup 0} {yields} ({rho}{pi}){sup 0} {yields} {pi}{sup +}{pi}{sup -}{pi}{sup 0} decays using a time-dependent Dalitz plot analysis. The results are obtained from a data sample of 375 million {Upsilon}(4S) {yields} B{bar B} decays, collected by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. We measure 26 coefficients of the bilinear form-factor terms occurring in the time-dependent decay rate of the B{sup 0} meson. We derive the physically relevant quantities from these coefficients. In particular, we measure a constraint on the angle {alpha} of the Unitarity Triangle.
Date:
March 6, 2007
Creator:
Aubert, B.
Object Type:
Article
System:
The UNT Digital Library
Productivity and injectivity of horizontal wells
One of the key issues addressed was pressure drop in long horizontal wells and its influence on well performance. Very little information is available in the literature on flow in pipes with influx through pipe walls. Virtually all of this work has been in small diameter pipes and with single-phase flow. In order to address this problem new experimental data on flow in horizontal and near horizontal wells have been obtained. Experiments were conducted at an industrial facility on typical 6 1/8 ID, 100 feet long horizontal well model. The new data along with available information in the literature have been used to develop new correlations and mechanistic models. Thus it is now possible to predict, within reasonable accuracy, the effect of influx through the well on pressure drop in the well.
Date:
March 6, 2000
Creator:
Aziz, Khalid
Object Type:
Report
System:
The UNT Digital Library
Small modular biopower initiative Phase 1 feasibility studies executive summaries
The Phase 1 objective is a feasibility study that includes a market assessment, resource assessment, preliminary system design, and assessment of relevant environmental and safety considerations, and evaluation of financial and cost issues, and a preliminary business plan and commercialization strategy. Each participating company will share at least 20% of the cost of the first phase.
Date:
March 6, 2000
Creator:
Bain, R.
Object Type:
Report
System:
The UNT Digital Library
Impedance Calculations of Non-Axisymmetric Transitions Using the Optical Approximation
In a companion report, we have derived a method for finding the impedance at high frequencies of vacuum chamber transitions that are short compared to the catch-up distance, in a frequency regime that--in analogy to geometric optics for light--we call the optical regime. In this report we apply the method to various non-axisymmetric geometries such as irises/short collimators in a beam pipe, step-in transitions, step-out transitions, and more complicated transitions of practical importance. Most of our results are analytical, with a few given in terms of a simple one dimensional integral. Our results are compared to wakefield simulations with the time-domain, finite-difference program ECHO, and excellent agreement is found.
Date:
March 6, 2007
Creator:
Bane, K. L. F.; Stupakov, G. & Zagorodov, I.
Object Type:
Article
System:
The UNT Digital Library
Femtosecond Laser Materials Processing
The use of femtosecond lasers allows materials processing of practically any material with extremely high precision and minimal collateral damage. Advantages over conventional laser machining (using pulses longer than a few tens of picoseconds) are realized by depositing the laser energy into the electrons of the material on a time scale short compared to the transfer time of this energy to the bulk of the material, resulting in increased ablation efficiency and negligible shock or thermal stress. The improvement in the morphology by using femtosecond pulses rather than nanosecond pulses has been studied in numerous materials from biologic materials to dielectrics to metals. During the drilling process, we have observed the onset of small channels which drill faster than the surrounding material.
Date:
March 6, 2000
Creator:
Banks, P. S.; Stuart, B. C.; Komashko, A. M.; Feit, M. D.; Rubenchik, A. M. & Perry, M. D.
Object Type:
Article
System:
The UNT Digital Library
Observations of microstructural coarsening in micro flip-chip solder joints
Coarsening of solder microstructures dramatically affects fatigue lifetimes. This paper presents a study of microstructural evolution due to thermal cycling and aging of small solder joints.
Date:
March 6, 2001
Creator:
Barney, Monica M. & Morris, John W., Jr.
Object Type:
Article
System:
The UNT Digital Library
From Non-Hermitian Effective Operators to Large-Scale No-Core Shell Model Calculations for Light Nuclei
No-core shell model (NCSM) calculations using ab initio effective interactions are very successful in reproducing experimental nuclear spectra. The main theoretical approach is the use of effective operators, which include correlations left out by the truncation of the model space to a numerically tractable size. We review recent applications of the effective operator approach, within a NCSM framework, to the renormalization of the nucleon-nucleon interaction, as well as scalar and tensor operators.
Date:
March 6, 2006
Creator:
Barrett, B R; Stetcu, I; Navratil, P & Vary, J P
Object Type:
Article
System:
The UNT Digital Library
Federal Emergency Management Policy Changes After Hurricane Katrina: A Summary of Statutory Provisions
This report summarizes provisions from legislation enacted by the 109th Congress with regard to federal emergency management authorities but does not cover all legislation enacted in response to Hurricane Katrina, Rita, Wilma.
Date:
March 6, 2007
Creator:
Bea, Keith
Object Type:
Report
System:
The UNT Digital Library
Federal Stafford Act Disaster Assistance: Presidential Declarations, Eligible Activities, and Funding
This report provides information about the Presidential Declarations, Eligible Activities, and Funding on Federal Stafford Act Disaster Assistance. Congress appropriates money to DRF for disaster assistance authorized by the Stafford Act, which is administered by FEMA.
Date:
March 6, 2007
Creator:
Bea, Keith
Object Type:
Report
System:
The UNT Digital Library
Sub-Scale Prototype Spent Nuclear Fuel/High Level Waste (SNF/HLW) Containers - B559010 REV 02
None
Date:
March 6, 2008
Creator:
Beardsley, M
Object Type:
Report
System:
The UNT Digital Library
South Texas Catholic (Corpus Christi, Tex.), Vol. 44, No. 5, Ed. 1 Friday, March 6, 2009
Semi-monthly newspaper from Corpus Christi, Texas published by the Diocese of Corpus Christi that includes news of interest to Diocese members along with advertising.
Date:
March 6, 2009
Creator:
Beaton, Paula J.
Object Type:
Newspaper
System:
The Portal to Texas History
Doctoral Recital: 2006-03-06 – Brad Bennight, harpsichord
Recital presented at UNT College of Music Organ Recital Hall in partial fulfillment of the Doctor of Musical Arts (DMA) degree
Date:
March 6, 2006
Creator:
Bennight, Brad
Object Type:
Sound
System:
The UNT Digital Library
Intelligence Issues for Congress
This report discusses intelligence issues for Congress including terrorism, conflicts between Israel and Palestine, in Iraq, and among the former Yugoslav states, and North Korean missile capabilities. Updated March 6, 2003.
Date:
March 6, 2003
Creator:
Best, Richard A., Jr.
Object Type:
Report
System:
The UNT Digital Library
Relocation impacts of an H-Separations coil and tube failure
The relocation impacts of an accidental release, scenario 1-RD-2.35, are evaluated for H-Separations. The extent of the area potentially contaminated to a level that would result in doses exceeding the relocation protective action guide (PAG) is calculated. The maximum calculated distance downwind from the accident at which the relocation PAG is exceeded is also determined. The consequences of the release are evaluated using the HOTSPOT model and an EXCEL spreadsheet.
Date:
March 6, 2000
Creator:
Blanchard, A.
Object Type:
Report
System:
The UNT Digital Library
Investigations of charged interfaces for electric vehicle applications
We refined the parametrization of our model for the hydrogen evolution on Pt(111) in the presence of SO4H2 [1,2,3,4]. In particular we studied the effects of changing the turning point of the water. The form of the voltammogram is not very sensitive to the exact position of the turning point, which in previous work was treated as an adjustable parameter. Physically a reasonable choice is that the turning point is the PZC (point of zero charge). This new parametrization clarified some issues related to the mechanism of hydrogen oxidation. In the early stages of this project, we tried with N. Marzari [5] to compute the ex-situ structure of the bisulfate-water √3X√7 (or also 5/2X√7) phase, seen by STM. However, we were unsuccessful in reproducing the known structures of the phase, even though we used state of the art pseudo potentials. There are various possible reasons why this happens, but the most obvious one is the environment of the electrode surface. This means that we need a theory that is able to include the local microfield as a function of the applied potential and electrochemical environment, and hence, we need to fully develop the density functional of a real molecular solvent …
Date:
March 6, 2007
Creator:
Blum, Lesser
Object Type:
Report
System:
The UNT Digital Library
Three-dimensional Reconstruction of Dust Particle Trajectories in the NSTX
Highly mobile incandescent dust particles are routinely observed on NSTX using two fast cameras operating in the visible region. An analysis method to reconstruct dust particle trajectories in space using two fast cameras is presented in this paper. Position accuracies of a few millimeters depending on the particle's location have been achieved and particle velocities between 10 and 200 m/s have been observed. 2008 American Institute of Physics. __________________________________________________
Date:
March 6, 2009
Creator:
Boeglin, W. U.; Roquemore, A. L. & Maqueda, R.
Object Type:
Report
System:
The UNT Digital Library