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1/5-scale experiment of a Mark I boiling-water reactor pressure-suppression system under hypothetical LOCA conditions
Experimental results show the sensitivity of hydrodynamically generated vertical loads to changes in the drywell pressurization rate, downcomer submergence, and vent-line loss coefficient. Insignificant effects on peak vertical loads were observed when the vent-line loss was varied. Peak vertical loads can be reduced by adding initial drywell overpressure so that the downcomers are partly cleared of water. Spatial variation of pressure at about the time of vent clearing is seen in comparisons of data from locations along the axis of the toroidal wetwell.
Date:
July 8, 1977
Creator:
Pitts, J. H. & McCauley, E. W.
Object Type:
Article
System:
The UNT Digital Library
2-D Imaging of Electron Temperature in Tokamak Plasmas
By taking advantage of recent developments in millimeter wave imaging technology, an Electron Cyclotron Emission Imaging (ECEI) instrument, capable of simultaneously measuring 128 channels of localized electron temperature over a 2-D map in the poloidal plane, has been developed for the TEXTOR tokamak. Data from the new instrument, detailing the MHD activity associated with a sawtooth crash, is presented.
Date:
July 8, 2004
Creator:
Munsat, T.; Mazzucato, E.; Park, H.; Domier, C. W.; Johnson, M.; Luhmann, N. C. Jr. et al.
Object Type:
Report
System:
The UNT Digital Library
3-D Silicon Photonic Lattices- Cornerstone of an Emerging Photonics Revolution
Three-dimensional photonic lattices are engineered materials which are the photonic analogues of semiconductors. These structures were first proposed and demonstrated in the mid-to-late 1980's. However, due to fabrication difficulties, lattices active in the infrared are only just emerging. Wide ranges of structures and fabrication approaches have been investigated. The most promising approach for many potential applications is a diamond-like structure fabricated using silicon microprocessing techniques. This approach has enabled the fabrication of 3-D silicon photonic lattices active in the infrared. The structures display band gaps centered from 12{micro} down to 1.55{micro}.
Date:
July 8, 1999
Creator:
Fleming, J.G. & Lin, Shawn-Yu
Object Type:
Article
System:
The UNT Digital Library
40 Years of Discovery
History is most interesting when seen through the eyes of those who lived it. In this 40th anniversary retrospective of bioscience research at Lawrence Livermore National Laboratory, we've asked 19 scientists to share their personal recollections about a major accomplishment in the program's history. We have not tried to create a comprehensive or seamless story. Rather, we've attempted to capture the perspectives of key individuals, each of whom worked on a research program that met significant milestones. We have focused particularly on programs and accomplishments that have shaped the current Biology and Biotechnology Research Program (BBRP). In addition, we have included a timeline of biosciences at LLNL, a history of the directorate that appeared in the Laboratory's magazine, ''Science & Technology Review'', in 2002, and a list of bioscience-related articles that have appeared over the years in ''Science & Technology Review and its predecessor, Energy & Technology Review''. The landscape of biological science today is stunningly different from 40 years ago. When LLNL bioscience began in 1963, we knew about the structure of DNA and that it was the carrier of genetic information. However, it would be another year before scientists would understand how DNA codes for the production of …
Date:
July 8, 2003
Creator:
Heller, Arnie; Henke, Amy; Weinstein, Bert & Thomas, Cindy
Object Type:
Report
System:
The UNT Digital Library
92nd Congress: Summary of Major Crime Control and Criminal Justice Legislation Enacted
This report outlines major legislation concerning crime and criminal justice during the 92nd Congress.
Date:
July 8, 1973
Creator:
Clapp, Jennifer
Object Type:
Report
System:
The UNT Digital Library
Abortion Services and Military Medical Facilities
The purpose of this report is to describe and discuss the provisions for providing abortion services to military personnel, their dependents and other military health care beneficiaries at military medical facilities. The report describes the history of these provisions, with particular emphasis on legislative actions. Finally, this report discusses a number of proposals to modify the law as well as other related legislative and administrative actions.
Date:
July 8, 2010
Creator:
Burrelli, David F.
Object Type:
Report
System:
The UNT Digital Library
AC Loss Analysis on the Superconducting Coupling Magnet in MICE
A pair of coupling solenoids is used in MICE experiment to generate magnetic field which keeps the muons within the iris of thin RF cavity windows. The coupling solenoids have a 1.5-meter inner diameter and will produce 7.4 T peak magnetic field. Three types of AC losses in coupling solenoid are discussed. The affect of AC losses on the temperature distribution within the cold mass during charging and rapid discharging process is analyzed also. The analysis result will be further confirmed by the experiment of the prototype solenoid for coupling solenoid, which will be designed, fabricated and tested at ICST.
Date:
July 8, 2008
Creator:
Wu, Hong; Wang, Li; Green, Michael; Li, LanKai; Xu, FengYu; Liu, XiaoKun et al.
Object Type:
Article
System:
The UNT Digital Library
Advanced Readout Electronics for Multielement CdZnTe Sensors
A generation of high performance front-end and read-out ASICs customized for highly segmented CdZnTe sensors is presented. The ASICs, developed in a multi-year effort at Brookhaven National Laboratory, are targeted to a wide range of applications including medical, safeguards/security, industrial, research, and spectroscopy. The front-end multichannel ASICs provide high accuracy low noise preamplification and filtering of signals, with versions for small and large area CdZnTe elements. They implement a high order unipolar or bipolar shaper, an innovative low noise continuous reset system with self-adapting capability to the wide range of detector leakage currents, a new system for stabilizing the output baseline and high output driving capability. The general-purpose versions include programmable gain and peaking time. The read-out multichannel ASICs provide fully data driven high accuracy amplitude and time measurements, multiplexing and time domain derandomization of the shaped pulses. They implement a fast arbitration scheme and an array of innovative two-phase offset-free rail-to-rail analog peak detectors for buffering and absorption of input rate fluctuations, thus greatly relaxing the rate requirement on the external ADC. Pulse amplitude, hit timing, pulse risetime, and channel address per processed pulse are available at the output in correspondence of an external readout request. Prototype chips have …
Date:
July 8, 2002
Creator:
De Geronimo, G.; O'Connor, P.; Kandasamy, A. & Grosholz, J.
Object Type:
Article
System:
The UNT Digital Library
Advanced turbine systems program conceptual design and product development. Quarterly report, February, 1996--April, 1996
This paper describes the design and testing of critical gas turbine components. Development of catalytic combustors and diagnostic equipment is included.
Date:
July 8, 1996
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Advances in NLTE Modeling for Integrated Simulations
The last few years have seen significant progress in constructing the atomic models required for non-local thermodynamic equilibrium (NLTE) simulations. Along with this has come an increased understanding of the requirements for accurately modeling the ionization balance, energy content and radiative properties of different elements for a wide range of densities and temperatures. Much of this progress is the result of a series of workshops dedicated to comparing the results from different codes and computational approaches applied to a series of test problems. The results of these workshops emphasized the importance of atomic model completeness, especially in doubly excited states and autoionization transitions, to calculating ionization balance, and the importance of accurate, detailed atomic data to producing reliable spectra. We describe a simple screened-hydrogenic model that calculates NLTE ionization balance with surprising accuracy, at a low enough computational cost for routine use in radiation-hydrodynamics codes. The model incorporates term splitting, {Delta}n = 0 transitions, and approximate UTA widths for spectral calculations, with results comparable to those of much more detailed codes. Simulations done with this model have been increasingly successful at matching experimental data for laser-driven systems and hohlraums. Accurate and efficient atomic models are just one requirement for integrated …
Date:
July 8, 2009
Creator:
Scott, H A & Hansen, S B
Object Type:
Article
System:
The UNT Digital Library
Aerial photography.
A training manual designed to teach aerial photography for military purposes.
Date:
July 8, 1941
Creator:
United States. War Department.
Object Type:
Book
System:
The UNT Digital Library
Affinity functions for modeling glass dissolution rates
Glass dissolution rates decrease dramatically as glasses approach "saturation" with respect to the leachate solution. This effect may lower the dissolution rate to 1/100 to 1/1000 of the unsaturated rate. Although rate controls on glass dissolution are best understood for conditions far from saturation, most repository sites are chosen where water fluxes are minimal, and therefore the waste glass is most likely to dissolve under conditions close to saturation. Our understanding of controls on dissolution rates close to saturation, versus far from saturation, are therefore of greater significance for assessing release rates of radionuclides from repositories. The key term in the rate expression used to predict glass dissolution rates close to saturation is the affinity term, which accounts for saturation effects on dissolution rates. The form of the affinity term and parameters used to model glass dissolution are clearly critical for accurate estimates of glass performance in a repository. The concept of saturation with respect to glass dissolution is problematic because of the thermodynamically unstable nature of glass. Saturation implies similar rates of forward (dissolution) and back (precipitation) reactions, but glasses cannot precipitate from aqueous solutions; there can be no back reaction to form glass. However experiments have shown that …
Date:
July 8, 1998
Creator:
Bourcier, W L
Object Type:
Article
System:
The UNT Digital Library
Afghanistan Reconstruction: Progress Made in Constructing Roads, but Assessments for Determining Impact and a Sustainable Maintenance Program Are Needed
A letter report issued by the Government Accountability Office with an abstract that begins "The Afghan government, the United States, and other donors consider road reconstruction a top development priority for Afghanistan. Almost 20 percent of the U.S. Agency for International Development's (USAID) $5.9 billion in assistance to Afghanistan has been for roads. The Department of Defense (Defense) has committed about $560 million for roads, of which Commander's Emergency Response Program (CERP) funds account for over half. GAO examined (1) the status of road reconstruction and challenges affecting project implementation, (2) U.S. agencies' efforts to evaluate the impact of road projects, and (3) efforts to develop a sustainable road maintenance program. GAO reviewed U.S. and Afghan governments' planning, evaluation, and funding documents and interviewed relevant stakeholders in Afghanistan."
Date:
July 8, 2008
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
Afghanistan: U.S. Foreign Assistance
The U.S. program of assistance to Afghanistan is intended to stabilize and strengthen the Afghan economic, social, political, and security environment so as to blunt popular support for extremist forces in the region. Since 2001, nearly $38 billion has been appropriated toward this effort. This report provides a "big picture" overview of the U.S. aid program and congressional action. It describes what various aid agencies report they are doing in Afghanistan. It does not address the effectiveness of their programs.
Date:
July 8, 2009
Creator:
Tarnoff, Curt
Object Type:
Report
System:
The UNT Digital Library
Afghanistan: U.S. Foreign Assistance
The U.S. program of assistance to Afghanistan is intended to stabilize and strengthen the Afghan economic, social, political, and security environment so as to blunt popular support for extremist forces in the region. Since 2001, nearly $48 billion has been appropriated toward this effort. This report provides a "big picture" overview of the U.S. aid program and congressional action. It describes what various aid agencies report they are doing in Afghanistan. It does not address the effectiveness of their programs.
Date:
July 8, 2010
Creator:
Tarnoff, Curt
Object Type:
Report
System:
The UNT Digital Library
Air Force Logistics: C-17 Support Plan Does Not Adequately Address Key Issues
A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a legislative requirement, GAO reviewed the Air Force's C-17 logistics support plan, focusing on the: (1) C-17's core logistics capabilities; (2) cost effectiveness of the planned support strategy; and (3) Air Force's implementation of the plan under current law."
Date:
July 8, 1999
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
Air Kerma Calibration Factors and kch Values for PTW Soft X-ray, NACP and Roos Ionization Chambers at Very Low X-ray Energies (0.035 mm - 1.0 mm Al HVL)
Several national and international protocols have been established for the dosimetry of x-ray beams used in radiotherapy. For the very low energy x-rays (0.035mm-1.0 mm Al HVL) only two codes are available: the UK IPEMB Code of Practice and the German standard, DIN 6809 Part 4. The measurement of very low energy x-ray beams is normally performed with parallel plate ionization chambers calibrated at a standards laboratory and characterized by an air kerma calibration factor N{sub k}. According to the IPEMB Code of Practice the absorbed dose in the user's beam should be determined by taking measurements with the parallel plate chamber positioned such that its entrance window is at the surface of a full-scatter water equivalent phantom. The absorbed dose to water can then be determined using an equation which includes a factor, k{sub ch}, which accounts for the change in response of the ionization chamber between the calibration in air and measurement at the surface of the phantom. N{sub k} and k{sub ch} values for the PTW soft X-ray, NACP and Roos ionization chambers are reported. It was found that k{sub ch} values varied from about 1.01 to 1.08 depending on the chamber, beam quality and phantom material. …
Date:
July 8, 1999
Creator:
Ipe, Nisy E.
Object Type:
Report
System:
The UNT Digital Library
AISI/DOE Technology Roadmap Program: Development of Appropriate Resistance Spot Welding Practice for Transformation-Hardened Steels
This report describes work accomplished in the project, titled ''Development of Appropriate Resistance Spot Welding Practice for Transformation-Hardened Steels.'' The Phase 1 of the program involved development of in-situ temper diagrams for two gauges of representative dual-phase and martensitic grades of steels. The results showed that tempering is an effective way of reducing hold-time sensitivity (HTS) in hardenable high-strength sheet steels. In Phase 2, post-weld cooling rate techniques, incorporating tempering, were evaluated to reduce HTS for the same four steels. Three alternative methods, viz., post-heating, downsloping, and spike tempering, for HTS reduction were investigated. Downsloping was selected for detailed additional study, as it appeared to be the most promising of the cooling rate control methods. The downsloping maps for each of the candidate steels were used to locate the conditions necessary for the peak response. Three specific downslope conditions (at a fix ed final current for each material, timed for a zero-, medium-, and full-softening response) were chosen for further metallurgical and mechanical testing. Representative samples, were inspected metallographically, examining both local hardness variations and microstructures. The resulting downslope diagrams were found to consist largely of a C-curve. The softening observed in these curves, however, was not supported by subsequent …
Date:
July 8, 2002
Creator:
Chuko, Wayne & Gould, Jerry
Object Type:
Report
System:
The UNT Digital Library
Altitude Performance of AN-F-58 Fuels in British Rolls-Royce Nene Single Combustor
"An investigation was conducted with a single combustor from a British Rolls-Royce Nene turbojet engine to determine the altitude performance characteristics of AN-F-58 fuels. Three fuel blends conforming to AN-F-58 specifications were prepared in order to determine the influence of fuel boiling temperatures and aromatic content on combustion efficiencies and altitude operational limits. The performance of the three AN-F-58 fuels was compared in the range of altitudes from sea level to 65,000 feet, engine speeds from 40- to 100- percent normal rated, and flight Mach numbers of 0.0 and 0.6" (p. 1).
Date:
July 8, 1949
Creator:
Cook, William P. & Koch, Richard G.
Object Type:
Report
System:
The UNT Digital Library
America Competes 2010: FY2012 Funding and FY2008-FY2011 Funding Summary
This report discusses how funding affects the America COMPETES program, and subsequently U.S. interests in R&D in STEM disciplines.
Date:
July 8, 2011
Creator:
Gonzalez, Heather B.
Object Type:
Report
System:
The UNT Digital Library
Americans with Disabilities Act (ADA) Requirements Concerning the Provision of Interpreters by Hospitals and Doctors
This report briefly discusses the Americans with Disabilities Act (ADA), which prohibits discrimination against individuals with disabilities by places of public accommodation. This report specifically discusses a common question of whether or not the ADA requires medical doctors and hospitals to provide an interpreter when they have a patient with a hearing disability.
Date:
July 8, 2004
Creator:
Jones, Nancy Lee
Object Type:
Report
System:
The UNT Digital Library
Americans with Disabilities Act (ADA) Requirements Concerning the Provision of Interpreters by Hospitals and Doctors
The Americans with Disabilities Act prohibits discrimination against individuals with disabilities by places of public accommodations. A common question concerning the ADA is whether this prohibition requires medical doctors and hospitals to provide an interpreter when they have a patient with a hearing disability. This requirement varies depending upon the situation presented but situations may arise where there is an obligation to provide an interpreter. Updated as appropriate.
Date:
July 8, 2004
Creator:
Jones, Nancy Lee
Object Type:
Report
System:
The UNT Digital Library
Annual Report for Gravity Collection Lysimeter Monitoring in ERDF Cells 5, 6, 7, an 8, CY 2009
The purpose of this annual report is to evaluate the conditions and identify trends to develop Hanford Site specific data on the performance of the lysimeter systems related to the vadose zone monitoring and potential future use of lysimeter systems.
Date:
July 8, 2010
Creator:
R.L. Weiss, B.L. Lawrence
Object Type:
Report
System:
The UNT Digital Library
Apparatus for Coupling and Uncoupling Cars
Patent for "a coupling of such construction as will permit the coupling and uncoupling of the cars to be effected by the engineer and to be entirely and at all times under his perfect control" (lines 16-20).
Date:
July 8, 1890
Creator:
McWhirter, Robert & Scheble, Eugene S.
Object Type:
Patent
System:
The Portal to Texas History