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Parity violation in polarized electron scattering
The weak forces are responsible for the decay of radioactive nuclei, and it was in these decay processes where parity non-conservation was first observed. Beta decay occurs through emission of e/sup +/ or e/sup -/ particles, indicating that the weak force can carry charge of both signs, and it was natural to speculate on the existence of a neutral component of the weak force. Even though weak neutral forces had not been observed it was conjectured that a neutral component of weak decay could exist, and Zel'dovich in 1957 suggested that parity violating effects may be observable in electron scattering and in atomic spectra. More than twenty years have passed since the early conjectures, and a great deal has been learned. Progress in quantum field theory led to the development of the SU(2) x U(1) gauge theory of weak and electromagnetic interactions and provided a renormalizable theory with a minimum of additional assumptions. Gauge theories predicted the existence of a new force, the neutral current interaction. This new interaction was first seen in 1973 in the Gargamelle bubble chamber at CERN. Today the neutral currents are accepted as well established, and it is the details of the neutral current structure …
Date:
October 1, 1980
Creator:
Prescott, Charles Y.
Object Type:
Article
System:
The UNT Digital Library
Spectroscopy of transition metal species in rare gas matrices. I. Vanadium metal. II. Sulfides. III. Carbonyl complexes. IV. Dinitrogen complexes. V. Homonuclear diatomic compounds
None
Date:
October 1, 1975
Creator:
DeVore, T. C.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Application of the graphical unitary group approach to the energy second derivative for CI wave functions via the coupled perturbed CI equations
Analytic derivatives of the potential energy for Self-Consistent-Field (SCF) wave functions have been developed in recent years and found to be useful tools. The first derivative for configuration interaction (CI) wave functions is also available. This work details the extension of analytic methods to energy second derivatives for CI wave functions. The principal extension required for second derivatives is evaluation of the first order change in the CI wave function with respect to a nuclear perturbation. The shape driven graphical unitary group approach (SDGUGA) direct CI program was adapted to evaluate this term via the coupled-perturbed CI equations. Several iterative schemes are compared for use in solving these equations. The pilot program makes no use of molecular symmetry but the timing results show that utilization of molecular symmetry is desirable. The principles for defining and solving a set of symmetry adapted equations are discussed. Evaluation of the second derivative also requires the solution of the second order coupled-perturbed Hartree-Fock equations to obtain the correction to the molecular orbitals due to the nuclear perturbation. This process takes a consistently higher percentage of the computation time than for the first order equations alone and a strategy for its reduction is discussed.
Date:
October 1, 1983
Creator:
Fox, D.J.
Object Type:
Report
System:
The UNT Digital Library
Dynamic modeling of transport and positional control of tokamaks
We describe here a numerical model of a free boundary axisymmetric tokamak plasma and its associated control systems. The plasma is modeled with a hybrid method using two-dimensional velocity and flux functions with surface-averaged MHD equations describing the evolution of the adiabatic invariants. Equations are solved for the external circuits and for the effects of eddy currents in nearby conductors. The method is verified by application to several test problems and used to simulate the formation of a bean-shaped plasma in the PBX experiment.
Date:
October 1, 1985
Creator:
Jardin, S. C.; Pomphrey, N. & DeLucia, J.
Object Type:
Report
System:
The UNT Digital Library
The Advanced Light Source U8 beam line, 20--300 eV
The U8 is a beam line under construction at the Advanced Light Source (ALS). The beam line will be described along with calculations of its performance and its current status. An 8 cm period undulator is followed by two spherical collecting mirrors, an entrance slit, spherical gratings having a 15{degree} deviation angle, a moveable exit slit, and refocusing and branching mirrors. Internal water cooling is provided to the metal M1 and M2 mirrors as well as to the gratings. Calculations have been made of both the flux output and the resolution over its photon energy range of 20--300 eV. The design goal was to achieve high intensity, 10{sup 12} photons/sec, at a high resolving power of 10,000. The U8 Participating Research Team (PRT) is planning experiments involving the photoelectron spectroscopy of gaseous atoms and molecules, the spectroscopy of ions and actinide spectroscopy.
Date:
October 1, 1991
Creator:
Heimann, P.; Warwick, T.; Howells, M.; McKinney, W.; Digennaro, D.; Gee, B. et al.
Object Type:
Article
System:
The UNT Digital Library
Manual for COMSYN: A orbit integration code for the study of beam dynamics in compact synchrotrons
COMSYN is a numerical integration code which is written for the study and design of the compact synchrotrons. An improved 4th-order Runge-Kutta method is used in COMSYN to integrate the exact equations of motion in a rectangular coordinate system. The magnetic field components of the dipole B{sub x}, B{sub y} and B{sub z} can be obtained from either measurement or directly computed data (MAGNUS, TOSCA). A spline interpolation method is then used to get the field value at the particle position. For standard quadrupole and sextupole, the analytical expression is employed to compute its field distribution.
Date:
October 1, 1991
Creator:
Huang, Y.
Object Type:
Report
System:
The UNT Digital Library
Reactor thermal-hydraulic FY 1986 status report for the multimegawatt Space Nuclear Power Program
PNL's 1986 activities can be divided into three basic areas: code assessment, correlation assessment and experimental activities. The ultimate goal of all these activities is developing computer codes and verifying their use to perform the thermal-hydraulic analysis and design of the reactor core and plenum of the various proposed concepts. To perform this task as assessment is made of existing computer codes, models, correlations, and microgravity experimental data.
Date:
October 1, 1986
Creator:
Krotiuk, W.J. & Antoniak, Z.I.
Object Type:
Report
System:
The UNT Digital Library
TRU Waste Management Program cost/schedule optimization analysis
The cost/schedule optimization task is a necessary function to insure that program goals and plans are optimized from a cost and schedule aspect. Results of this study will offer DOE information with which it can establish, within institutional constraints, the most efficient program for the long-term management and disposal of contact handled transuranic waste (CH-TRU). To this end, a comprehensive review of program cost/schedule tradeoffs has been made, to identify any major cost saving opportunities that may be realized by modification of current program plans. It was decided that all promising scenarios would be explored, and institutional limitations to implementation would be described. Since a virtually limitless number of possible scenarios can be envisioned, it was necessary to distill these possibilities into a manageable number of alternatives. The resultant scenarios were described in the cost/schedule strategy and work plan document. Each scenario was compared with the base case: waste processing at the originating site; transport of CH-TRU wastes in TRUPACT; shipment of drums in 6-Packs; 25 year stored waste workoff; WIPP operational 10/88, with all sites shipping to WIPP beginning 10/88; and no processing at WIPP. Major savings were identified in two alternate scenarios: centralize waste processing at INEL and …
Date:
October 1, 1985
Creator:
Detamore, J. A. (Rockwell International Corp., Albuquerque, NM (United States). Joint Integration Office); Raudenbush, M. H.; Wolaver, R. W. & Hastings, G. A. (Stoller (S.M.) Corp., Boulder, CO (United States))
Object Type:
Report
System:
The UNT Digital Library
[News Script: Grand jury]
Script from the WBAP-TV/NBC station in Fort Worth, Texas relating a news story.
Date:
October 1, 1968
Creator:
WBAP-TV (Television station : Fort Worth, Tex.)
Object Type:
Script
System:
The UNT Digital Library
[Letter template from Bill McCarter and Nancy Cason, October 1, 1991]
Photocopy of a letter template from Bill McCarter and Nancy Cason of North Texas Institute for Educators on the Visual Arts. The letter is in regards to the successful implementation of DBAE, discipline-based arts education in NTIEVA's consortium members. Several of the districts are getting together for sharing ideas and extended planning for a number of activities for the 1990 and 1991 Summer Institute. McCarter and Cason have included in the letter, registration forms for activities through the month of October that they believe are extremely worthwhile.
Date:
October 1, 1991
Creator:
McCarter, William & Cason, Nancy
Object Type:
Letter
System:
The UNT Digital Library
Migrant Labor Law and Relations: Selected References, 1960-1969
This report provides a bibliography of sources related to migrant labor law and relations that were published between 1960 and 1969.
Date:
October 1, 1969
Creator:
Guy, Kent
Object Type:
Report
System:
The UNT Digital Library
Screening study on high temperature energy transport systems
The purpose of the study described in this document is to identify the options for transporting thermal energy over long distances. The study deals specifically and exclusively with high temperature (> 400/sup 0/C(752/sup 0/F)) energy for industrial use. Energy transport is seen as a potential solution to: high unit cost of small coal and nuclear steam generators, and opposition to siting of coal or nuclear plants near populated areas. The study is of a preliminary nature but covers many options including steam, molten salts, organics, and chemical heat pipes. The development status and potential problems of these and other energy transport methods are discussed. Energy transport concepts are compared on a fundamental level based on physical properties and also are subjected to an economic study. The economic study indicated that the chemical heat pipe, under a specific set of circumstances, appeared to be the least expensive for distances greater than about 32 km (20 miles). However, if the temperature of the energy was lowered, the heat transfer salt (sodium nitrate/nitrite) system would apparently be a better economic choice for less than about 80 km (50 miles). None of the options studied appear to be more attractive than small coal-fired boilers …
Date:
October 1, 1980
Creator:
Graves, R.L.
Object Type:
Report
System:
The UNT Digital Library
Chemical Technology Branch annual report, fiscal year 1967
None
Date:
October 1, 1967
Creator:
Bower, J. R.
Object Type:
Report
System:
The UNT Digital Library
Modeling of coupled geochemical and transport processes: An overview
Early coupled models associated with fluid flow and solute transport have been limited by assumed conditions of constant temperature, fully saturated fluid flow, and constant pore fluid velocity. Developments including coupling of chemical reactions to variable fields of temperature and fluid flow have generated new requirements for experimental data. As the capabilities of coupled models expand, needs are created for experimental data to be used for both input and validation. 25 refs.
Date:
October 1, 1989
Creator:
Carnahan, C.L.
Object Type:
Article
System:
The UNT Digital Library
Review of induction LINACS
There has been a recent upsurge of activity in the field of induction linacs, with several new machines becoming operational and others in the design stages. The performance levels of electron machines have reached 10's of kiloamps of current and will soon reach 10's of MeV's of energy. Acceleration of ion current has been demonstrated, and the study of a 10 GeV heavy ion induction linac for ICF continues. The operating principles of induction linacs are reviewed with the emphasis on design choices which are important for increasing the maximum beam currents.
Date:
October 1, 1981
Creator:
Faltens, A. & Keefe, D.
Object Type:
Article
System:
The UNT Digital Library
Improved tunnel resistance of silvered-polymer mirrors
This report documents the research performed at the Solar Energy Research Institute during fiscal year (FY) 1991 to develop ways to prevent delamination failure (known as tunneling) of silvered-polymer reflector materials. Several promising approaches have been identified and demonstrated that substantially reduce such failures. These approaches include (1) use of Tedlar edge tape rather than the manufacturer-recommended ECP-244 tape, (2) thermal treatment of laminated reflector/substrate constructions, and (3) application of silver to the polymer film through an alternative deposition process. Approaches 1 and 2 offer readily available engineering solutions to the delamination problem. Approaches 2 and 3 provide tunnel resistance over the entire surface of the reflector material, including the edges. Tedlar (a polyvinyl fluoride from DuPont) tape is an opaque white tape available in different widths from 3M Company. The base material has demonstrated outstanding outdoor durability. Thermal treatment of ECP-305 laminated to substrate materials has demonstrated outstanding resistance to tunneling. Alternative silver deposition techniques such as sputtering (rather than thermal evaporation) offer increased resistance to tunneling. 15 refs., 10 figs.
Date:
October 1, 1991
Creator:
Jorgensen, G.; Schissel, P.; Kennedy, C.; Shinton, Y.; Powell, D. & Siebarth, J.
Object Type:
Report
System:
The UNT Digital Library
Optical watthour meter digitizer
As concern about energy conservation and energy-use efficiency increases, a simple and inexpensive instrument that would provide accurate, reliable and high-resolution data on electrical energy usage should find widespread application in research and industrial facilities. An instrument that would also provide one or more outputs compatible with a wide range of digital data acquisition systems would be especially appropriate, since the use of automatic data logging equipment is now common, even in small-scale and low-budget operations. An optical watthour meter digitizer was developed which meets these criteria. Based on the induction-type watthour meter, the digitizer provides an output pulse for a fixed amount of energy use. The digitizer senses the motion of the rotor disc of the meter by optically detecting passage of a nonreflective area painted on the underside of the disc. The passage of such area initiates a logic-compatible output pulse that can be used to measure power or energy usage in a variety of ways. The accuracy of the measurement is determined by the watthour meter. The resolution of the measurement is determined by the K/sub h/ constant (in watthours per revolution) of the meter and the number of equally spaced targets painted on the disc. The …
Date:
October 1, 1980
Creator:
Andrews, W.H.
Object Type:
Report
System:
The UNT Digital Library
Growth rate of dislocation loop in Fe-Ni-Cr alloy under Kr sup + ion and electron irradiation
In order to examine the effect of irradiating particle species on the growth rate of radiation-induced dislocation loops, a solution-annealed Fe-25Ni-15Cr-0.02C alloy was irradiated at 723 K first by 1.5 MeV Kr{sup +} ions for 2520 sec, then by 1.5 MeV Kr{sup +} ions and 1.0 MeV electrons simultaneously for 780 sec, and finally by 1.0 MeV electrons for 780 sec with the HVEM-Tandem Facility in Argonne National Laboratory. The calculated damage rate by 1.5 MeV Kr{sup +} ions was 5.8 {times} 10{sup {minus}4} dpa/s, and that by 1.0 MeV electrons was 1 {times} 10{sup {minus}4} dpa/s. The growth rate of a dislocation loop located at the center of the specimen was 7 {times} 10{sup {minus}3} nm/s for the Kr{sup +} ion irradiation, 4 {times} 10{sup {minus}2} nm/s for the simultaneous Kr{sup +} and electron irradiation, and (2--3) {times} 10{sup {minus}2} nm/s for the electron irradiation. This implies that the electron irradiation is about 19 times more effective in the growth of radiation-induced dislocation loops than the Kr{sup +} ion irradiation. The dislocation loop growth rate under the simultaneous Kr{sup +} and electron irradiation is higher than the sum of the growth rates under the individual Kr{sup +} and electron …
Date:
October 1, 1991
Creator:
Kimoto, T. (National Research Inst. for Metals, Tsukuba, Ibaraki (Japan)); Allen, C.W. & Rehn, L.E. (Argonne National Lab., IL (United States))
Object Type:
Article
System:
The UNT Digital Library
Price and availability of western coal in the midwestern electric utility market, 1974--1982
None
Date:
October 1, 1974
Creator:
Asbury, J.G. & Cotello, K.W.
Object Type:
Report
System:
The UNT Digital Library
Background information on the SSC project
This report discusses the following information about the Superconducting Super Collider: Goals and milestones; civil construction; ring components; cryogenics; vacuum and cooling water systems; electrical power; instrumentation and control systems; and installation planning.
Date:
October 1, 1991
Creator:
Warren, J.
Object Type:
Report
System:
The UNT Digital Library
Design and test report for transportable solar laboratory program
None
Date:
October 1, 1974
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Applications of concrete polymer materials for the rehabilitation of bridge decks
The rapid deterioration of concrete bridge decks as a result of the increased use of deicing salts is one of the most severe problems facing the highway industry today. One possible solution to the problem is the use of concrete polymer materials. The materials of prime interest are polymer-impregnated concrete (PIC) and polymer concrete (PC), both of which have excellent durability and strength properties. Three potential applications: repair of deteriorated bridge decks, polymer impregnation of new bridge deck surfaces, and full impregnation of precast deck panels have been studied in laboratory and field tests and the results have been encouraging. These results and economic considerations are described.
Date:
October 1, 1977
Creator:
Kukacka, L. E.
Object Type:
Article
System:
The UNT Digital Library
Metal vapor excimer laser. Quarterly progress report, May 1, 1977--July 31, 1977. [CdHg vapors]
The CdHg excimer program will attempt to determine the existence of optical gain in a discharge pumped high temperature medium. This first quarterly contract period primarily involves detailed design of the experimental apparatus capable of producing high temperature metal vapor. The report begins with the general considerations which went into designing the experiment and follows with descriptions and schematics of the experiment as presently conceived.
Date:
October 1, 1977
Creator:
Kovacs, M A & Jacob, J H
Object Type:
Report
System:
The UNT Digital Library
Thermal-Stress and Strain-Fatigue Analyses of the MSRE Fuel and Coolant Pump Tanks
Thermal-stress and strain-fatigue analyses of the MSRE fuel and coolant pump tanks were completed for determining the quantity of coollng air required to obtain the maximum life of the pump tanks and to determine the acceptability of the pump tanks for the intended service of 100 heating cycles from room temperature to 1200 deg F and 500 reactor power-change cycles from zero to 10 Mw. A cooling-air flow rate of 200 cfm for the fuel pump tank was found to be an optimum value that provided an ample margin of safety. The coolant pump tank was found to be capable of the required service without air cooling. (auth)
Date:
October 1, 1962
Creator:
Gabbard, C.G.
Object Type:
Report
System:
The UNT Digital Library