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25-ps neutron detector for measuring ICF-target burn history
We have developed a fast, sensitive neutron detector for recording the fusion reaction-rate history of inertial-confinement fusion (ICF) experiments. The detector is based on the fast rise-time of a commercial plastic scintillator (BC-422) and has a response < 25 ps FWHM. A thin piece of scintillator material acts as a neutron-to-light converter. A zoom lens images scintillator light to a high-speed (15 ps) optical streak camera for recording. A retractable nose cone positions the scintillator between 1 and 50 cm from a target. A simultaneously recorded optical fiducial pulse allows the streak camera time base to be calibrated relative to the incident laser power. Burn histories have been measured for deuterium-tritium filled targets with yields ranging between 10{sup 8} and 2 {times} 10{sup 13} neutrons.
Date:
May 2, 1994
Creator:
Lerche, R. A.; Phillion, D. W. & Tietbohl, G. L.
Object Type:
Article
System:
The UNT Digital Library
A 3D Contact Smoothing Method
Smoothing of contact surfaces can be used to eliminate the chatter typically seen with node on facet contact and give a better representation of the actual contact surface. The latter affect is well demonstrated for problems with interference fits. In this work we present two methods for the smoothing of contact surfaces for 3D finite element contact. In the first method, we employ Gregory patches to smooth the faceted surface in a node on facet implementation. In the second method, we employ a Bezier interpolation of the faceted surface in a mortar method implementation of contact. As is well known, node on facet approaches can exhibit locking due to the failure of the Babuska-Brezzi condition and in some instances fail the patch test. The mortar method implementation is stable and provides optimal convergence in the energy of error. In the this work we demonstrate the superiority of the smoothed versus the non-smoothed node on facet implementations. We also show where the node on facet method fails and some results from the smoothed mortar method implementation.
Date:
May 2, 2002
Creator:
Puso, M. A. & Laursen, T. A.
Object Type:
Article
System:
The UNT Digital Library
78th Texas Legislature, Regular Session, House Concurrent Resolution 85
Concurrent resolution introduced by the Texas House of Representatives and Senate relating to saluting volunteers in the State of Texas.
Date:
May 2, 2003
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
78th Texas Legislature, Regular Session, House Concurrent Resolution 210
Concurrent resolution introduced by the Texas House of Representatives and Senate relating to designating April 23, 2003, as Long-Term Care Ombudsman Day in Texas.
Date:
May 2, 2003
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
78th Texas Legislature, Regular Session, Senate Bill 240, Chapter 11
Bill introduced by the Texas Senate relating to the enrollment of certain children and recipients of medical assistance in group health benefit plans.
Date:
May 2, 2003
Creator:
Texas. Legislature. Senate.
Object Type:
Legislative Document
System:
The Portal to Texas History
78th Texas Legislature, Regular Session, Senate Joint Resolution 25
Joint resolution introduced by the Texas Senate and House of Representatives relating to proposing a constitutional amendment authorizing the legislature to exempt certain travel trailers from ad valorem taxation.
Date:
May 2, 2003
Creator:
Texas. Legislature. Senate.
Object Type:
Legislative Document
System:
The Portal to Texas History
80th Texas Legislature, Regular Session, House Joint Resolution 36
Joint resolution introduced by the Texas House of Representatives and Senate relating to proposing a constitutional amendment to permit a state justice or judge who reaches the mandatory age of retirement while in office to complete the justice's or judge's current term.
Date:
May 2, 2007
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
83rd Texas Legislature, Regular Session, House Concurrent Resolution 24
Concurrent resolution introduced by the Texas House of Representatives and Senate designating Nacogdoches as the official Garden Capital of Texas.
Date:
May 2, 2013
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
83rd Texas Legislature, Regular Session, House Concurrent Resolution 109
Concurrent resolution introduced by the Texas House of Representatives and Senate honoring Sue Brannon of Midland for her years of civic engagement.
Date:
May 2, 2013
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
83rd Texas Legislature, Regular Session, Senate Bill 422, Chapter 5
Bill introduced by the Texas Senate relating to service of citation on a financial institution.
Date:
May 2, 2013
Creator:
Texas. Legislature. Senate.
Object Type:
Legislative Document
System:
The Portal to Texas History
83rd Texas Legislature, Regular Session, Senate Bill 510, Chapter 6
Bill introduced by the Texas Senate relating to passing certain vehicles on a highway; providing a penalty.
Date:
May 2, 2013
Creator:
Texas. Legislature. Senate.
Object Type:
Legislative Document
System:
The Portal to Texas History
83rd Texas Legislature, Regular Session, Senate Bill 530, Chapter 7
Bill introduced by the Texas Senate relating to the inclusion of the emblem of the veteran's branch of service on Disabled Veteran specialty license plates.
Date:
May 2, 2013
Creator:
Texas. Legislature. Senate.
Object Type:
Legislative Document
System:
The Portal to Texas History
83rd Texas Legislature, Regular Session, Senate Bill 543, Chapter 8
Bill introduced by the Texas Senate relating to the authority of the Midland County Hospital District of Midland County, Texas, to employ and commission peace officers.
Date:
May 2, 2013
Creator:
Texas. Legislature. Senate.
Object Type:
Legislative Document
System:
The Portal to Texas History
83rd Texas Legislature, Regular Session, Senate Bill 847, Chapter 9
Bill introduced by the Texas Senate relating to business entities and associations.
Date:
May 2, 2013
Creator:
Texas. Legislature. Senate.
Object Type:
Legislative Document
System:
The Portal to Texas History
83rd Texas Legislature, Regular Session, Senate Bill 953, Chapter 10
Bill introduced by the Texas Senate relating to the adoption of the Uniform Trade Secrets Act.
Date:
May 2, 2013
Creator:
Texas. Legislature. Senate.
Object Type:
Legislative Document
System:
The Portal to Texas History
85th Texas Legislature, Regular Session, House Bill 89, Chapter 1
Bill introduced by the Texas House of Representatives relating to state contracts with and investments in companies that boycott Israel.
Date:
May 2, 2017
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
AB Initio Calculations of Elastic Constants of BCC V-NB System at High Pressures
First-principles total energy calculation based on the exact muffin-tin orbital and full potential linear muffin-tin orbital methods were used to calculate the equation of state and shear elastic constants of bcc V, Nb, and the V{sub 95}Nb{sub 05} disordered alloy as a function of pressure up to 6 Mbar. We found a mechanical instability in C{sub 44} and a corresponding softening in C at pressures {approx} 2 Mbar for V. Both shear elastic constants show softening at pressures {approx} 0.5 Mbar for Nb. Substitution of 5 at. % of V with Nb removes the instability of V with respect to trigonal distortions in the vicinity of 2 Mbar pressure, but still leaves the softening of C{sub 44} in this pressure region. We argue that the pressure induced shear instability (softening) of V (Nb) originates from the electronic system and can be explained by a combination of the Fermi surface nesting, electronic topological transition, and band Jahn-Teller effect.
Date:
May 2, 2005
Creator:
Landa, A; Klepeis, J; Soderlind, P; Naumov, I; Velikokhatnyi, O; Vitos, L et al.
Object Type:
Article
System:
The UNT Digital Library
The Absorption Spectrum of Hydrated Americium Chloride
The following document focuses on the study of the absorption spectra of americium chloride. Large samples and a spectrograph of great dispersion were used.
Date:
May 2, 1952
Creator:
Stover, Betsy Jones & Conway, John G.
Object Type:
Report
System:
The UNT Digital Library
Acetylene Gas Generator
Patent for an acetylene gas generator. Illustration included.
Date:
May 2, 1905
Creator:
Pruitt, George Holditch & Pruitt, Conrad D.
Object Type:
Patent
System:
The Portal to Texas History
Achieving Order through CHAOS: the LLNL HPC Linux Cluster Experience
Since fall 2001, Livermore Computing at Lawrence Livermore National Laboratory has deployed 11 Intel IA-32-based Linux clusters ranging in size up to 1154 nodes. All provide a common programming model and implement a similar cluster architecture. Hardware components are carefully selected for performance, usability, manageability, and reliability and are then integrated and supported using a strategy that evolved from practical experience. Livermore Computing Linux clusters run a common software environment that is developed and maintained in-house while drawing components and additional support from the open source community and industrial partnerships. The environment is based on Red Hat Linux and adds kernel modifications, cluster system management, monitoring and failure detection, resource management, authentication and access control, development environment, and parallel file system. The overall strategy has been successful and demonstrates that world-class high-performance computing resources can be built and maintained using commodity off-the-shelf hardware and open source software.
Date:
May 2, 2003
Creator:
Braby, R L; Garlick, J E & Goldstone, R J
Object Type:
Article
System:
The UNT Digital Library
Active Measurement of Memory Resource Consumption
None
Date:
May 2, 2013
Creator:
Guix, M C & Bronevetsky, G
Object Type:
Report
System:
The UNT Digital Library
Active Measurement of the Impact of Network SwitchUtilization on Application Performance
None
Date:
May 2, 2013
Creator:
Guix, M C & Bronevetsky, G
Object Type:
Report
System:
The UNT Digital Library
Adaptation of Combustion Principles to Aircraft Propulsion Volume 2: Combustion in Air-Breathing Jet Engines
This volume continues the NACA study of combustion principles for aircraft propulsion. The various aspects of combustion pertinent to jet engines are organized and interpreted with quite extensive information, particularly for basic or fundamental. subject matter. The report concerns only air-breathing engines and hydrocarbon fuels, and not rocket engines and high-energy fuels.
Date:
May 2, 1956
Creator:
Fuels and Combustion Research Division
Object Type:
Report
System:
The UNT Digital Library
Aerodynamic characteristics of two-plane, unswept tapered wings of aspect ratio 3 and 3-percent thickness from tests on a transonic bump
From Introduction: "The Ames Aeronautical Laboratory has in progress an experimental investigation of the aerodynamic characteristics of wings of interest in the design of high-speed fighter aircraft. This program included an investigation in the Ames 6-by 6-foot supersonic wind tunnel at both subsonic and supersonic Mach numbers of a wing-body combination having a 3-percent-thick, unswept, tapered wing with circular-arc sections and an aspect ratio of 3.1 (reference 1).
Date:
May 2, 1952
Creator:
Emerson, Horace F. & Gale, Bernard M.
Object Type:
Report
System:
The UNT Digital Library