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A Physical Property Summary for Fluoride Mixtures
This report presents a summary of certain physical properties that have been determined experimentally on the fluoride mixture that have been formulated at ORNL (Rers. 1, 2). These properties include the density, enthalpy, heat capacity, heat of fusion, thermal conductivity, viscosity, Prandtl number, electrical conductivity and surface tension. In addition to the experimental data, values have been predicted for the heat capacity and density of the other mixtures from the correlations of these properties. Estimates of the viscosity have also been made for a number of the mixtures on which no experimental data were available.
Date:
September 5, 1956
Creator:
Cohen, S. I.; Povers, W. D. & Greene, N. D.
Object Type:
Report
System:
The UNT Digital Library
Absorption and Turnover Rates of Iron Measured by the Whole Body Counter
Human iron metabolism has been extensively studied in the past twenty-five years with the radioisotopes iron⁵⁵ and iron⁵⁹. Before the availability of the whole body counter, however, iron absorption studies were performed by the indirect methods of fecal assay of unabsorbed radioiron, and estimation of red cell incorporation of absorbed tracer. The few long-term excretion studies performed required numerous assumptions, since human iron excretion was less well understood. Whole body counting provides a simple and accurate method of measuring the total body retention of administrative tracer iron⁵⁹, thus making absorption and subsequent excretion determinations possible with a single radioiron study. The energetic gamma emissions of iron⁵⁹ permit ready external detection with small quantities of isotope, Normal radioiron distribution is uniform throughout the circulating red cell mass and thus minimize geometry influences on the counting efficiency, 0nly the 45.1 day half-life of iron⁵⁹ limits long term iron turnover studies. Measurements of iron⁵⁹ absorption and long-term body turnover have been under way at Brookhaven National Laboratory for over two years. The present paper outlines some of the results of these studies, and discusses some implications of the method.
Date:
September 5, 1962
Creator:
Price, D. C.; Cohn, S. H. & Cronkite, B. P.
Object Type:
Report
System:
The UNT Digital Library
Summary of the Research Progress Meeting of June 12, 1952
Summary of the research progress meeting of June 12, 1952
Date:
September 5, 1952
Creator:
Felden, Margaret Fess
Object Type:
Report
System:
The UNT Digital Library
The Effect of Neutron Bombardment on the Specific Heat of Graphite at Low Temperatures
The work described in this technical report was undertaken as part of a larger program dealing with a systematic investigation of changes in the physical prosperities of artificial graphite due to neutron bombardment. Very pronounced among those changes is the increase in the elastic modulus. Since there is a general relationship between the elastic modulus of a given substance and its specific heat, it was expected that corresponding changes will occur in the specific heat. In conclusion, the experiments determined that it appears that the low temperature specific heat measurements of strongly bombarded samples will be helpful for the understanding of the nature and the mechanism of the changes produced by neutron bombardment and annealing.
Date:
September 5, 1945
Creator:
Estermann, I. (Immanuel), 1900-1973 & Kirkland, G. I.
Object Type:
Report
System:
The UNT Digital Library
Determination of Zirconium in Plutonium-Zirconium Alloys
A method for determining zirconium in plutonium-zirconium alloys was required as part of an investigation of alloys containing fissionable material, with possible use in nuclear reactors. Alloys of these two elements were brought into solution with a bisulfate fusion and the zirconium was separated by precipitation with p-bromomandelic acid. Determinations were completed by weighing the zirconium oxide obtained after ignition of the precipitate at 925 degree C. The precision of this recommended procedure was estimated in terms of the standard deviation for quadruplicate determinations, made with weight aliquots from dissolved alloy samples. The range for the standard deviation was 0.5 to 1.7 parts per thousand for samples from which aliquots each containing 9 to 15 mg of zirconium were selected. The complete recovery of zirconium from solutions of pure zirconyl chloride and plutonium trichloride was shown by the 95 percent confidence limits of 99.9 +- 0.3 percent for the average of four determinations, observed with samples containing 5 to12 mg of zirconium in the presence of 10 to 20 mg of plutonium. It was found the Mo, La, PU(III), and K2Cr2O7 do not interfere with zirconium determinations made according to the recommended procedures, but Pu(IV) does interfere slightly. It was …
Date:
September 5, 1952
Creator:
Bergstresser, K. S. (Karl Samuel), 1909-2004
Object Type:
Report
System:
The UNT Digital Library
Animated Sign
Patent for a display apparatus to be implemented as animated advertising signs which successively display different images by controlling the timing of changes in the colors of light used to flood the front and to backlight the display surfaces. The images are created in such a way that certain elements created in certain colors become absorbed or are made invisible when illuminated by certain colors of light. An apparatus controls the cyclical changes of the colored lights used by the sign.
Date:
September 5, 1922
Creator:
Craig, Richard M.
Object Type:
Patent
System:
The Portal to Texas History
Churn Dasher
Patent for the churn dasher. This invention relates to dashers, or agitators, for churns and similar devices and aims to provide an improved assemblage of the component elements of the dasher, whereby to facilitate the agitation of the material and to aerate the same. Illustrations are provided.
Date:
September 5, 1917
Creator:
Lambie, R.C.
Object Type:
Patent
System:
The Portal to Texas History
Cigarette Package.
Patent for "new and useful Improvements in Cigarette Packages" (lines 5-6) including "the method of dispensing or extracting cigarettes from the package and as well to the method of making a cigarette package" (lines 9-12), including one illustration.
Date:
September 5, 1922
Creator:
Sohn, Elmer L.
Object Type:
Patent
System:
The Portal to Texas History
Method of and Apparatus for Producing Transformation Effects
Patent for a method of creating transformation effects through the use of particular colors of illumination, to be used in the theater, amusement houses, or other performances. The invention involves using lights whose colors can either "absorb" or "wash out" certain objects or designs of the same color while revealing objects of a complementary color.
Date:
September 5, 1922
Creator:
Craig, Richard M.
Object Type:
Patent
System:
The Portal to Texas History
Cotton Stalk Cutter and Insect Killer
Patent for improvements to mechanical cotton stalk cutting and insect destroying apparatus. The machine's object is "cutting the stalks into small pieces, and the crushing the stalks so as to crush and destroy insects which may be upon the withered stalks." (lines 26-29).
Date:
September 5, 1922
Creator:
Batla, Thomas H. & Holan, Heny J.
Object Type:
Patent
System:
The Portal to Texas History
I. Niobium(IV) Bromide and Pyridine Adducts of the Niobium(IV) Halides
Technical report. From Abstract : "Reaction of NbBr5 and niobium metal in a sealed tube under a temperature gradient from 410° to 350° gave NbBr4 in good yields. However, an increase in the higher temperature from 410° to 450° was sufficient to eliminate NbBr4 as a product and cause deposition of a lower bromide."
Date:
September 5, 1962
Creator:
McCarley, Robert E. & Torp, Bruce A.
Object Type:
Report
System:
The UNT Digital Library
The Preparation of TaBr4, TaI4 and Pyridine Adducts of the Tantalum(IV) Halides
Technical report. From Abstract : "The necessary conditions for preparation of TaBr4 and TaI4 by reduction of the pentahalides with tantalum or aluminum metal in a sealed tube under a controlled temperature gradient have been demonstrated."
Date:
September 5, 1962
Creator:
McCarley, R. E. & Boatman, J. C.
Object Type:
Report
System:
The UNT Digital Library
Phoebus 2 pressure vessel-nozzle structural proof test procedure
None
Date:
September 5, 1966
Creator:
Hildner, R. A. & Arnold, C. E.
Object Type:
Report
System:
The UNT Digital Library
Thermal-mechanical design of a 150-mA, direct-current, 400-keV accelerator for production of 14-MeV neutrons
Several unique accelerator components were designed and built for the Rotating Target Neutron Source Facility at the Lawrence Livermore Laboratory. Particular consideration was given to material selection and cooling design of components because the facility will have a large steady-state beam energy. Components discussed include the system composed of the ion source and 90-deg double-focusing magnet in the high-voltage terminal, a water-cooled 400-keV acceleration column, a pyrolytic-graphite beam collimator, and quick-disconnect beam-tube couplings.
Date:
September 5, 1977
Creator:
Hanson, C. L.
Object Type:
Article
System:
The UNT Digital Library
Simple example of track finding by Fourier transform and possibilities for vector or optical processors
Simple examples of finding tracks by Fourier transform with filter or correlation function are presented. Possibilities for using this method in more complicated real situations and the processing times which might be achieved are discussed. The method imitates the simplest examples in the literature on optical pattern recognition and optical processing. The possible benefits of the method are in speed of processing in the optical Fourier transform wherein an entire picture is processed simultaneously. The speed of a computer vector processor may be competitive with present electro-optical devices. 2 refs., 6 figs.
Date:
September 5, 1986
Creator:
Underwood, D.
Object Type:
Article
System:
The UNT Digital Library
Texas Turkey Poults: For Week Ending August 30, 1980
Weekly report of the Texas Crop and Livestock Reporting Service on turkey poult numbers in Texas and compared with other states. It includes compiled statistics across six consecutive weeks, from the week ending August 2 to the week ending August 30, during 1979 and 1980 for turkey eggs set and poults hatched.
Date:
September 5, 1980
Creator:
Texas Crop and Livestock Reporting Service
Object Type:
Report
System:
The Portal to Texas History
Texas Preventable Disease News, Volume 47, Number 35, September 5, 1987
Newsletter of the Texas Bureau of Disease Control and Epidemiology discussing the news, activities, and events of the organization and other information related to health in Texas.
Date:
September 5, 1987
Creator:
Texas. Bureau of Disease Control and Epidemiology.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
NIF PEPC LRU Test Stand Safety Note Addendum
It is necessary that the NIF PEPC LRU Test Stand be modified to accommodate a new experiment. This modification will involve boring two 1/2 inch holes in the Center Loaded Upper Beam of the stand. These holes will allow a small wire to pass through half of the length of one of the long sections of 80/20 part 3030. The holes could adversely effect the load-bearing capabilities of an important structural member of the stand so calculations must be done to assure a minimal risk of part failure.
Date:
September 5, 2001
Creator:
Mason, D
Object Type:
Report
System:
The UNT Digital Library
Theory Issues for Induced Plasma Convection Experiments in the Divertor of the MAST Spherical Tokamak
This paper surveys theory issues associated with inducing convective cells through divertor tile biasing in a tokamak to broaden the scrape-off layer (SOL). The theory is applied to the Mega-Ampere Spherical Tokamak (MAST), where such experiments are planned in the near future. Criteria are presented for achieving strong broadening and for exciting shear-flow turbulence in the SOL; these criteria are shown to be attainable in practice. It is also shown that the magnetic shear present in the vicinity of the X-point is likely to confine the potential perturbations to the divertor region below the X-point, leaving the part of the SOL that is in direct contact with the core plasma intact. The current created by the biasing and the associated heating power are found to be modest.
Date:
September 5, 2001
Creator:
Cohen, R. H.; Fielding, S.; Helander, P. & Ryutov, D. D.
Object Type:
Article
System:
The UNT Digital Library
Technical Advances in the Continuous Melting of Phosphate Laser Glass
Continuous melting of phosphate laser glass is now being used for the first time to prepare meter-scale amplifier optics for megajoule lasers. The scale-up to continuous melting from the previous one-at-a-time ''discontinuous'' batch process has allowed for the production of glass at rates more than 20 times faster, 5 times cheaper, and with 2-3 times better optical quality. Almost 8000 slabs of laser glass will be used in high-energy, high-peak-power laser systems that are being designed and built for fusion energy research. The success of this new continuous melting process, which is a result of a six year joint R&D program between government and industry, stems from numerous technical advances which include (1) dehydroxylating the glass to concentrations less than {approx}100 ppm OH; (2) minimizing damage-causing Pt-inclusions; (3) preventing glass fracture; (4) minimizing impurities such as Cu and Fe to <20 ppm; (5) improving forming methods to get high optical homogeneity glass; and (6) developing large aperture quality assurance tools to verify properties of the glass.
Date:
September 5, 2001
Creator:
Suratwala, T.; Thorsness, C.; Campbell, J.; Takeuchi, K.; Suzuki, K.; Yamamoto, K. et al.
Object Type:
Article
System:
The UNT Digital Library
Search for simultaneous optical counterparts of gamma-ray bursts
Gamma Ray Bursts (GRBs) are brief, randomly located, releases of gamma-ray energy from unknown celestial sources that occur almost daily. The study of GRBs has undergone a revolution in the past three years due to an international effort of follow-up observations made possible by the instantaneous distribution of reliable GRB coordinate information over the internet provided by NASA's GCN (GRB Coordinates Network). The 3-year LDRD project described here, done in collaboration with the workers responsible for the GCN, was the very first serious system to actively utilize the GCN and thus played a major role in the development of the GCN and the dramatic increase in our understanding of GRBs. The scientific objective of this project was to measure the intensity of any prompt visible radiation accompanying the gamma-ray emission utilizing a small but sensitive robotic telescope that responded to GCN triggers by rapidly taking images of the GCN error box. The instrument developed for this project, LOTIS, was the first of its kind, and the longest running, collecting data on over 75 GRBs during its 3 year running period. The results of LOTIS and the other follow-up programs have now shown that GRBs are at cosmological distances and interact …
Date:
September 5, 2000
Creator:
Park, H. S.; Porrata, R. A.; Bionta, R. M. & Williams, G. G.
Object Type:
Report
System:
The UNT Digital Library
Parametric Techniques for Extreme-Contracts, High-Energy Petawatt Pulses
Prepulses are of great concern in high-power lasers: if their intensity is sufficiently high, they can heat and/or destroy a target before the arrival of the main pulse. For ultrahigh peak power lasers, for which focused intensity can exceed 10{sup 21} W/cm{sup 2}, a contrast of at least 10{sup 8} is the minimum requirement to avoid preionization of solid targets. Conventional preamplification stages do not meet this requirement, primarily due to prepulse originating from regenerative amplification. Optical parametric amplification (OPA) is well-known to generate pulses with a prepulse contrast equal to the gain of the amplifier, but it does not remove pre-existing prepulses. In this paper we describe a novel technique for contrast enhancement in cascaded optical parametric amplifiers (COPA). Based on cascaded idler utilization, COPA represents a versatile technique with a potentially infinite prepulse contrast enhancement. We have experimentally demonstrated COPA, producing a prepulse contrast of 10{sup 8}, limited by the sensitivity of measurement. A simple modification of the front end of a petawatt-type laser that utilizes optical parametric chirped pulse amplification (OPCPA) can yield unprecedented levels of prepulse contrast.
Date:
September 5, 2003
Creator:
Jovanovic, I; Wattellier, B & Barty, C P J
Object Type:
Article
System:
The UNT Digital Library
Local Structure of amorphous (PbO){sub x}[(B{sub 2}O{sub 3}){sub 1-z}(Al{sub 2}O{sub 3}){sub z}]{sub y} (SiO{sub 2}){sub y} Dielectric Materials by Multinuclear Solid State NMR
Structural speciation of glasses in the systems PbO-B{sub 2}O{sub 3}-SiO{sub 2}, PbO-B{sub 2}O{sub 3}-Al{sub 2}O{sub 3}-SiO{sub 2}, and PbO-Al{sub 2}O{sub 3}-SiO{sub 2} were studied using solid-state {sup 29}Si, {sup 27}Al, {sup 11}B, and {sup 207}Pb nuclear magnetic resonance (NMR) and Raman spectroscopy. Application of these methods provided insight into the role of Al{sub 2}O{sub 3} incorporation in the lead-borosilicate glass networks. The general composition range studied was (PbO){sub x} [(B{sub 2}O{sub 3}){sub 1-z} (Al{sub 2}O{sub 3})z]{sub y}(SiO{sub 2}){sub y} where x = 0.35, 0.5, and 0.65, y = (1-x)/2 and z = 0.0, 0.5 and 1.0. Additional insight was obtained via {sup 27}Al 2D-3QMAS experiments. The {sup 207}Pb spin echo mapping spectra showed a transition from ionic (Pb{sup 2+}) to covalently bound lead species with increased PbO contents in the borosilicate glasses. The addition of aluminum to the glass network further enhanced the lead species transition resulting in a higher relative amount of covalent lead bonding in the high PbO content alumino-borosilicate glass. The number of BO{sub 4} units present in the {sup 11}B MAS NMR decreased with increasing PbO contents for both the borosilicate and the alumino-borosilicate glass systems, with the addition of aluminum further promoting the BO{sub 3} …
Date:
September 5, 2003
Creator:
Sawvel, A.; Chinn, S.; Bourcier, W. & Maxwell, R.
Object Type:
Article
System:
The UNT Digital Library
Horizontal Path Laser Communications Employing MEMS Adaptive Optics Correction
Horizontal path laser communications are beginning to provide attractive alternatives for high-speed optical communications, In particular, companies are beginning to sell fiberless alternatives for intranet and sporting event video. These applications are primarily aimed at short distance applications (on the order of 1 km pathlength). There exists a potential need to extend this pathlength to distances much greater than a 1km. For cases of long distance optical propagation, atmospheric turbulence will ultimately limit the maximum achievable data rate. In this paper, we propose a method of improved signal quality through the use of adaptive optics. In particular, we show work in progress toward a high-speed, small footprint Adaptive Optics system for horizontal path laser communications. Such a system relies heavily on recent progress in Micro-Electro-Mechanical Systems (MEMS) deformable mirrors as well as improved communication and computational components. In this paper we detail two Adaptive Optics approaches for improved through-put, the first is the compensated receiver (the traditional Adaptive Optics approach), the second is the compensated transmitter/receiver. The second approach allows for correction of the optical wavefront before transmission from the transmitter and prior to detection at the receiver.
Date:
September 5, 2001
Creator:
Thompson, C. A.; Wilks, S. C.; Brase, J. M.; Young, R. A.; Johnson, G. W. & Ruggiero, A. J.
Object Type:
Article
System:
The UNT Digital Library