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Alumni J-TAC, Fall 1991
Alumni magazine of Tarleton State University providing information on events at the school and news about university students, staff, and alumni.
Date:
Autumn 1991
Creator:
Tarleton State University
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Alumni J-TAC, Homecoming 1991
Homecoming edition of the Tarleton State University alumni magazine describing related events and other news about university students, staff, and alumni.
Date:
Autumn 1991
Creator:
Tarleton State University
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
The J-TAC (Stephenville, Tex.), Ed. 1 Thursday, October 3, 1991
Weekly student newspaper from Tarleton State University in Stephenville, Texas that includes local, state and campus news along with advertising.
Date:
October 3, 1991
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Color Transparency and the Energy Evolution of Final-State Interactions in Charmonium Photoproduction
None
Date:
January 1, 1991
Creator:
Gardner, A. & Gardner, Susan
Object Type:
Report
System:
The UNT Digital Library
Indium dopant/defect complexes in lightly-doped ceria
Four well-defined indium-dopant/lattice-defect complexes and the non-complexed substitutional indium dopant have been observed by perturbed angular correlation (PAC) spectroscopy in cerium oxide. PAC is a nuclear hyperfine experimental method that detects interactions between a radioactive probe nucleus and nearby atoms. The magnitude and symmetry of those interactions provide a signature for the electromagnetic fields at the probe nucleus. These fields are produced by the arrangement of charges and magnetic moments in the near environment of the probe, so they provide a means of identifying defect structures.
Date:
December 31, 1991
Creator:
Wang, Ruiping; Gardner, J. A.; Evenson, W. E. & Sommers, J. A.
Object Type:
Article
System:
The UNT Digital Library
Surface hydrology, sediment transport dynamics, and remote sensing of disturbed watersheds in a humid temperature region
The specific objectives of this research are to quantify relationships between surface spectral properties and infiltration capacity explore the interaction between surface hydrology and basin morphology, specifically drainage network morphology, and develop a comprehensive process-response model for drainage basin evolution. This research examines the response of the drainage network and drainage basin water discharge to changes in the dominant processes that control infiltration and runoff, namely macropore network development. Infiltration, the primary regulator of runoff, is analyzed with respect to surface spectral characteristics and drainage basin water discharge. Changes in basin discharge measured on a storm event basis in the field are supplemented with simulated discharge events using a distributed hydrologic model. The hydrologic model is evaluated and parameterized by means of a detailed sensitivity analysis. The response of drainage basin water discharge to charges in infiltration properties of minesoils, and the inferred runoff process, and drainage network morphology is examined. The threshold discharge, or stream power, for sediment entrainment and the implications for changes in sediment discharge through time is also discussed. Ritter and Gardner conclude with a process-response model for drainage basin evolution, with implications for natural drainage basin response to climate change. Finally, basic rainfall-runoff relationships developed …
Date:
October 1, 1991
Creator:
Gardner, T.W. & Miller, A.C.
Object Type:
Report
System:
The UNT Digital Library
Development of a process control sensor for the glass industry
This project was initiated to fill a need in the glass industry for a non-contact temperature sensor for glass melts. At present, the glass forming industry (e.g., bottle manufacture) consumes significant amounts of energy. Careful control of temperature at the point the bottle is molded is necessary to prevent the bottle from being rejected as out-of-specification. In general, the entire glass melting and conditioning process is designed to minimize this rejection rate, maximize throughput and thus control energy and production costs. This program focuses on the design, development and testing of an advanced optically based pyrometer for glass melts. The pyrometer operates simultaneously at four wavelengths; through analytical treatment of the signals, internal temperature profiles within the glass melt can be resolved. A novel multiplexer alloys optical signals from a large number of fiber-optic sensors to be collected and resolved by a single detector at a location remote from the process. This results in a significant cost savings on a per measurement point basis. The development program is divided into two phases. Phase 1 involves the construction of a breadboard version on the instrument and its testing on a pilot-scale furnace. In Phase 2, a prototype analyzer will be constructed …
Date:
May 1, 1991
Creator:
Gardner, M.; Candee, A.; Kramlich, J. & Koppang, R.
Object Type:
Report
System:
The UNT Digital Library
PAC spectroscopy of electronic ceramics
Dilute indium dopants in cerium oxides and YBa{sub 2}Cu{sub 3}O{sub x} have been studied by{sup 111}In/Cd Perturbed Angular Correlation (PAC) spectroscopy. By controlling oxygen vacancy concentration in the cerium oxides through doping or high-temperature vacuum annealing, we have found that indium always forms a defect complex unless the sample is doped to reduce greatly the oxygen vacancy concentration. Three different vacancy-associated complexes are found with concentrations that depend on doping and oxygen stoichiometry. Another defect complex occurs in samples having negligible vacancy concentration. At low temperatures, evidence is found of interaction with an electronic hole trapped by {sup 111}Cd after the radioactive decay of the {sup 111}In parent. In YBa{sub 2}Cu{sub 3}O{sub x} the indium substitutes preferentially at the Y site but has measurable probability of substitution in at least one of the two copper sites. A symmetry change near 650 {degree}C is consistent with the well-documented orthorhombic/tetragonal transition for samples in air or oxygen.
Date:
December 31, 1991
Creator:
Gardner, J. A.; Wang, Ruiping; Schwenker, R.; Evenson, W. E.; Rasera, R. L. & Sommers, J. A.
Object Type:
Report
System:
The UNT Digital Library
Generalized emittance measurements in a beam transport line
Motivated by the need to commission 3 beam transport lines for the new AGS Booster project, we have developed a generalized emittance-measurement program; beam line specifics are entirely resident in data tables, not in program code. For instrumentation, the program requires one or more multi-wire profile monitors; one or multiple profiles are acquired from each monitor, corresponding to one or multiple tunes of the transport line. Emittances and Twiss parameters are calculated using generalized algorithms. The required matix descriptions of the beam optics are constructed by an on-line general beam modeling program. Design of the program, its algorithms, and initial experience with it will be described. 4 refs., 2 figs., 1 tab.
Date:
January 1, 1991
Creator:
Skelly, J.; Gardner, C.; Luccio, A.; Kponou, A. & Reece, K.
Object Type:
Article
System:
The UNT Digital Library
Bibliography of the technical literature of the Materials Joining Group, 1951--1991
This document contains a listing of the written scientific information originating in the Materials Joining (formerly the Welding and Brazing Group), Metals and Ceramics Division, Oak Ridge National Laboratory during 1951 through June 1991. This registry of documents is as much as possible, in the order of issue date.
Date:
December 1, 1991
Creator:
David, S. A.; Goodwin, G. M. & Gardner, K.
Object Type:
Report
System:
The UNT Digital Library
Bibliography of the technical literature of the Materials Joining Group, 1951--1991
This document contains a listing of the written scientific information originating in the Materials Joining (formerly the Welding and Brazing Group), Metals and Ceramics Division, Oak Ridge National Laboratory during 1951 through June 1991. This registry of documents is as much as possible, in the order of issue date.
Date:
December 1, 1991
Creator:
David, S. A.; Goodwin, G. M. & Gardner, K. (comps.)
Object Type:
Report
System:
The UNT Digital Library
Modulus dispersion and attenuation in tuff and granite
The effects of loading frequency, strain amplitude, and saturation on elastic moduli and attenuation have been measured in samples of the Topopah Spring Member welded tuff. Four different laboratory techniques have been used to determine Young`s modulus and extensional wave attenuation at frequencies ranging from 10{sup {minus}2} to 10{sup 6} Hz. The results are compared with data acquired for Sierra White granite under the same conditions. The modulus and attenuation in room dry samples remain relatively constant over frequency. Frequency dependent attenuation and modulus dispersion are observed in the saturated samples and are attributed to fluid flow and sample size. The properties of tuff were independent of strain amplitude in room dry and saturated conditions.
Date:
December 23, 1991
Creator:
Haupt, R. W.; Martin, R. J., III; Tang, X.; Dupree, W. J. & Price, R. H.
Object Type:
Report
System:
The UNT Digital Library
Indium dopant/defect complexes in lightly-doped ceria
Four well-defined indium-dopant/lattice-defect complexes and the non-complexed substitutional indium dopant have been observed by perturbed angular correlation (PAC) spectroscopy in cerium oxide. PAC is a nuclear hyperfine experimental method that detects interactions between a radioactive probe nucleus and nearby atoms. The magnitude and symmetry of those interactions provide a signature for the electromagnetic fields at the probe nucleus. These fields are produced by the arrangement of charges and magnetic moments in the near environment of the probe, so they provide a means of identifying defect structures.
Date:
January 1, 1991
Creator:
Wang, Ruiping; Gardner, J.A. (Oregon State Univ., Corvallis, OR (United States). Dept. of Physics); Evenson, W.E. (Brigham Young Univ., Provo, UT (United States). Dept. of Physics) & Sommers, J.A. (Teledyne-Wah Chang, Albany, OR (United States))
Object Type:
Article
System:
The UNT Digital Library
An examination of performance aspects of two major works for percussion ensemble: Toccata by Carlos Chávez and Cantata para América mágica by Alberto Ginastera, a lecture recital, together with four recitals of selected works of I. Stravinsky, R. Vaughan Williams, W.A. Mozart, V. Persichetti, and P. Hindemith
This study addresses the ways and means a conductor may approach two major twentieth century works written specifically for percussion ensemble. Performance techniques and decisions on aesthetics made by the conductor in dealing with such items as timbre, balance, pitch levels, and pitch relationships are also considered.
Date:
August 1991
Creator:
George, Matthew
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
PAC spectroscopy of electronic ceramics
Dilute indium dopants in cerium oxides and YBa{sub 2}Cu{sub 3}O{sub x} have been studied by{sup 111}In/Cd Perturbed Angular Correlation (PAC) spectroscopy. By controlling oxygen vacancy concentration in the cerium oxides through doping or high-temperature vacuum annealing, we have found that indium always forms a defect complex unless the sample is doped to reduce greatly the oxygen vacancy concentration. Three different vacancy-associated complexes are found with concentrations that depend on doping and oxygen stoichiometry. Another defect complex occurs in samples having negligible vacancy concentration. At low temperatures, evidence is found of interaction with an electronic hole trapped by {sup 111}Cd after the radioactive decay of the {sup 111}In parent. In YBa{sub 2}Cu{sub 3}O{sub x} the indium substitutes preferentially at the Y site but has measurable probability of substitution in at least one of the two copper sites. A symmetry change near 650 {degree}C is consistent with the well-documented orthorhombic/tetragonal transition for samples in air or oxygen.
Date:
January 1, 1991
Creator:
Gardner, J.A.; Wang, Ruiping; Schwenker, R. (Oregon Univ., Eugene, OR (United States). Dept. of Physics); Evenson, W.E. (Brigham Young Univ., Provo, UT (United States). Dept. of Physics and Astronomy); Rasera, R.L. (Maryland Univ., Catonsville, MD (United States). Dept. of Physics) & Sommers, J.A. (Teledyne-Wah Chang, Albany, OR (United States))
Object Type:
Report
System:
The UNT Digital Library
Moisture Control Handbook: New, low-rise, residential construction
Moisture problems are prevalent all over North America, almost independent of climate. They are viewed as one of the single largest factors limiting the useful service life of a building. Elevated levels of moisture in buildings also can lead to serious health effects for occupants. Until recently, very little consensus on moisture control existed in the building community. The information available was typically incomplete, contradictory, usually limited to specific regions, and in many cases misleading. A need to develop a document which presented the issues relating to moisture from a building science or ``systems`` approach existed. This handbook attempts to fill that need and illustrates that energy-efficient, tight envelope design is clearly part of the solution to healthy buildings when interior relative humidity, temperature, and pressure are controlled simultaneously. The first three chapters of the handbook present the basic principles of moisture problems and solutions in buildings. Chapter 1 -- Mold, Mildew, and Condensation, examines surface moisture problems. Chapter 2 -- Moisture Movement, examines how building assemblies get wet from both the exterior and interior. Chapter 3 -- Wetting and Drying of Building Assemblies, introduces the concepts of acceptable performance, moisture balance, and the redistribution of moisture within building assemblies. …
Date:
October 1, 1991
Creator:
Lstiburek, J. & Carmody, J.
Object Type:
Report
System:
The UNT Digital Library
Three-dimensional calculations of fields and loading for loop and folded waveguide ICRF antennas
The ANT and ORION codes have been combined and used to study the loading of various antenna geometries with simple three-dimensional (3-D) effects. Both codes use a slab model with periodic Fourier analysis for modeling the toroidal and poloidal directions. The ANT code is used to prescribe current sets in a vacuum region where the field solutions are obtained analytically of each Fourier mode and matching conditions are used at poloidal/toroidal current sheet locations. Multiple current sheets are permitted and various feeder options are available to model the radial antenna currents. Current elements maybe oriented at arbitrary angles to the static magnetic field and may be independently phased in time. The fields at the plasma surface are prescribed by an impedance matrix for each Fourier mode. The ORION code solves for the fields in the plasma region using finite difference techniques, a plasma dispersion relation that retains the lowest-order finite gyroradius effects, and all three electric field components. Results are presented for a folded waveguide mock-up and for a loop antenna design under identical plasma conditions.
Date:
January 1, 1991
Creator:
Carter, M. D.; Baity, F. W.; Batchelor, D. B.; Hoffman, D. J.; Jaeger, E. F.; Swain, D. W. et al.
Object Type:
Article
System:
The UNT Digital Library
Electromagnetic field effects on cells of the immune system: The role of calcium signalling
During the past decade considerable evidence has accumulated demonstrating the exposures of cells of the immune system to relatively weak extremely-low-frequency (ELF) electromagnetic fields (< 300 Hz) can elicit cellular changes which might be relevant to in-vivo immune activity. However, knowledge about the underlying biological mechanisms by which weak fields induce cellular changes is still very limited. It is generally believed that the cell membrane and Ca{sup 2+} regulated activity is involved in bioactive ELF field-coupling to living systems. This article begins with a short review of the current state of knowledge concerning the effects of nonthermal levels of ELF electromagnetic fields on the biochemistry and activity of immune cells, and then closely examines new results which suggest a role for Ca{sup 2+} in the induction of these cellular field effects. Based on these findings it is proposed that membrane-mediated Ca{sup 2+} signalling processes are involved in the mediation of field effects on the immune system. 64 refs., 2 tabs.
Date:
July 1, 1991
Creator:
Walleczek, J.
Object Type:
Article
System:
The UNT Digital Library
Hydrodynamick instabilities on ICF capsules
This article summarizes our current understanding of hydrodynamic instabilities as relevant to ICF. First we discuss classical, single mode Rayleigh-Taylor instability, and nonlinear effects in the evolution of a single mode. Then we discuss multimode systems, considering: (1) the onset of nonlinearity; (2) a second order mode coupling theory for weakly nonlinear effects, and (3) the fully nonlinear regime. Two stabilization mechanisms relevant to ICF are described next: gradient scale length and convective stabilization. Then we describe a model which is meant to estimate the weakly nonlinear evolution of multi-mode systems as relevant to ICF, given the short-wavelength stabilization. Finally, we discuss the relevant code simulation capability, and experiments. At this time we are quite optimistic about our ability to estimate instability growth on ICF capsules, but further experiments and simulations are needed to verify the modeling. 52 refs.
Date:
June 7, 1991
Creator:
Haan, S.W.
Object Type:
Article
System:
The UNT Digital Library
The Clifton Record and Bosque County Tribune (Clifton, Tex.), Vol. 96, No. 11, Ed. 1 Wednesday, March 13, 1991
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
March 13, 1991
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record and Bosque County Tribune (Clifton, Tex.), Vol. 96, No. 6, Ed. 1 Wednesday, February 6, 1991
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
February 6, 1991
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
Perry Daily Journal (Perry, Okla.), Vol. 98, No. 22, Ed. 1 Thursday, March 7, 1991
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
March 7, 1991
Creator:
Watson, Milo W.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Perry Daily Journal (Perry, Okla.), Vol. 98, No. 271, Ed. 1 Thursday, December 26, 1991
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 26, 1991
Creator:
Watson, Milo W.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Perry Daily Journal (Perry, Okla.), Vol. 98, No. 191, Ed. 1 Saturday, September 21, 1991
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
September 21, 1991
Creator:
Watson, Milo W.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History