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8
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7
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7
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404
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47
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18
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1 MeV electron irradiation of solid Xe nanoclusters in Al : an in-situ HRTEM study.
Thin film samples of a simple embedded nanocluster system consisting of solid Xe precipitates in Al have been subjected to 1 MeV electron irradiation in a high-voltage electron microscope. High-resolution images have been recorded on videotape in order to monitor the changes to the system resulting from the passage of electrons through the film. Inspection of the video recordings (in some cases frame-by-frame) reveals that complex, rapid processes occur under the electron beam. These include, movement of small clusters, coalescence of neighboring clusters, shape changes, the apparent melting and resolidification of the Xe, and the creation and annealing of extended defects within the Xe lattice. A tentative interpretation of some of the observations is presented in terms of the electron-induced displacement processes at the surface of the clusters.
Date:
December 5, 1997
Creator:
Donnelly, S. E.; Furuya, K.; Song, M.; Birtcher, R. C. & Allen, C. W.
Object Type:
Article
System:
The UNT Digital Library
15th Street News (Midwest City, Okla.), Vol. 27, No. 13, Ed. 1 Friday, December 5, 1997
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
December 5, 1997
Creator:
Easttom, Holly
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Advanced process research and development to enhance metals and materials recycling.
Innovative, cost-effective technologies that have a positive life-cycle environmental impact and yield marketable products are needed to meet the challenges of the recycling industry. Four materials-recovery technologies that are being developed at Argonne National Laboratory in cooperation with industrial partners are described in this paper: (1) dezincing of galvanized steel scrap; (2) material recovery from auto-shredder residue; (3) high-value-plastics recovery from obsolete appliances; and (4) aluminum salt cake recycling. These technologies are expected to be applicable to the production of low-cost, high-quality raw materials from a wide range of waste streams.
Date:
December 5, 1997
Creator:
Daniels, E. J.
Object Type:
Article
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 98, No. 222, Ed. 1 Friday, December 5, 1997
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 5, 1997
Creator:
Cole, Carol
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Audit of the Department of Energy`s management of field contractor employees assigned to headquarters and other federal agencies
The Department of Energy (Department) has spent at least $76 million annually for field contractor employee support in Headquarters and other Federal agencies. The employees were to provide technical expertise and experience critical to Department operations and programs. Overall, the audit was performed to determine if the Department was managing the use of field contractor employees assigned to Headquarters and other Federal agencies. Specifically, it was to determine whether the Department reviews and evaluates the costs for the use of contractor employees, is reimbursed for contractors working at other Federal agencies, and had implemented corrective actions proposed as the result of a prior audit report on this subject. The Department did not effectively manage the use of field contractor employees assigned to Headquarters and other Federal agencies. Specifically, the Department was unable to identify all contractor employees assigned to the Washington, DC area or determine the total cost of maintaining them; some employees were providing routine support and administrative services rather than unique program expertise; and several of the Department`s contractors had assigned their employees to work in other agencies without receiving full reimbursement for their services. In addition, the Department did not fully implement the corrective actions it agreed …
Date:
December 5, 1997
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
The Baytown Sun (Baytown, Tex.), Vol. 76, No. 30, Ed. 1 Friday, December 5, 1997
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
December 5, 1997
Creator:
Dobbs, Gary
Object Type:
Newspaper
System:
The Portal to Texas History
The Boerne Star (Boerne, Tex.), Vol. 93, No. 97, Ed. 1 Friday, December 5, 1997
Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
December 5, 1997
Creator:
Aldridge, Leon
Object Type:
Newspaper
System:
The Portal to Texas History
Characterization of composite ceramic high level waste forms.
Argonne National Laboratory has developed a composite ceramic waste form for the disposition of high level radioactive waste produced during electrometallurgical conditioning of spent nuclear fuel. The electrorefiner LiCl/KCl eutectic salt, containing fission products and transuranics in the chloride form, is contacted with a zeolite material which removes the fission products from the salt. After salt contact, the zeolite is mixed with a glass binder. The zeolite/glass mixture is then hot isostatic pressed (HIPed) to produce the composite ceramic waste form. The ceramic waste form provides a durable medium that is well suited to incorporate fission products and transuranics in the chloride form. Presented are preliminary results of the process qualification and characterization studies, which include chemical and physical measurements and product durability testing, of the ceramic waste form.
Date:
December 5, 1997
Creator:
Frank, S. M.; Bateman, K. J.; DiSanto, T.; Johnson, S. G.; Moschetti, T. L.; Noy, M. H. et al.
Object Type:
Article
System:
The UNT Digital Library
Chickasha Daily Express (Chickasha, Okla.), Ed. 1 Friday, December 5, 1997
Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 5, 1997
Creator:
Bush, Kent
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Clean and cost-effective dry boundary lubricants for aluminum forming.
Preliminary research in our laboratory has demonstrated that boric acid is an effective lubricant with an unusual capacity to reduce sliding fiction (providing friction coefficients as low as 0.02) and wear of metallic and ceramic materials. More recent studies have revealed that water or methanol solutions of boric acid can be used to prepare strongly bonded layers of boric acid on aluminum surfaces. It appears that boric acid molecules have a strong tendency to bond chemically to the naturally oxidized surfaces of aluminum and its alloys and to make these surfaces very slippery. Recent metal formability tests indicated that the boric acid films formed on aluminum surfaces by spraying or dipping worked quite well; improving draw scale performance by 58 to 75%. These findings have increased the prospect that boric acid can be formulated and optimized as an effective boundary lubricant and used to solve the friction, galling, and severe wear problems currently encountered in cold-forming of aluminum products. Accordingly, the major goal of this paper is to demonstrate the usefulness and lubrication capacity of thin boric acid films formed on aluminum surfaces by simple dipping or spraying processes and to describe the lubrication mechanisms under typical metal forming conditions. …
Date:
December 5, 1997
Creator:
Erdemir, A. & Fenske, G. R.
Object Type:
Article
System:
The UNT Digital Library
The Clifton Record (Clifton, Tex.), Vol. 102, No. 98, Ed. 1 Friday, December 5, 1997
Semi-weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
December 5, 1997
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
Converting films for x-ray detectors, applied to amorphous silicon arrays.
This paper presents results from our on-going efforts to characterize semiconductor thin films for direct x-ray conversion. We deposit these thin films onto an amorphous silicon (a-Si:H) readout array with the overall goal of developing a large area x-ray detector for protein crystallography, and for other x-ray imaging fields.
Date:
December 5, 1997
Creator:
Ross, S. & Zentai, G.
Object Type:
Article
System:
The UNT Digital Library
The Daily Chickasha Star (Chickasha, Okla.), Vol. 96, No. 151, Ed. 1 Friday, December 5, 1997
Newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 5, 1997
Creator:
Settle, David
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Dallas Voice (Dallas, Tex.), Vol. 14, No. 32, Ed. 1 Friday, December 5, 1997
Weekly newspaper from Dallas, Texas that includes local, state, and national news and advertising of interest to the Lesbian, Gay, Bisexual, and Transgender (LGBT) community.
Date:
December 5, 1997
Creator:
Vercher, Dennis
Object Type:
Newspaper
System:
The UNT Digital Library
Determining thermal diffusivity and defect attributes in ceramic matrix composites by infrared imaging.
Ceramic matrix composites are being developed for numerous high temperature applications, including rotors and combustors for advanced turbine engines, heat exchanger and hot-gas filters for coal gasification plants. Among the materials of interest are silicon-carbide-fiber-reinforced-silicon-carbide (SiC{sub (f)}/SiC), silicon-carbide-fiber-reinforced-silicon-nitride (SiC{sub (f)}/Si{sub 3}N{sub 4}), aluminum-oxide-reinforced-alumina (Al{sub 2}O{sub 3(f)}/Al{sub 2}O{sub 3}), etc. In the manufacturing of these ceramic composites, the conditions of the fiber/matrix interface are critical to the mechanical and thermal behavior of the component. Defects such as delaminations and non-uniform porosity can directly effect the performance. A nondestructive evaluation (NDE) method, developed at Argonne National Laboratory has proved beneficial in analyzing as-processed conditions and defect detection created during manufacturing. This NDE method uses infrared thermal imaging for fill-field quantitative measurement of the distribution of thermal diffusivity in large components. Intensity transform algorithms have been used for contrast enhancement of the output image. Nonuniformity correction and automatic gain control are used to dynamically optimize video contrast and brightness, providing additional resolution in the acquired images. Digital filtering, interpolation, and least-squares-estimation techniques have been incorporated for noise reduction and data acquisition. The Argonne NDE system has been utilized to determine thermal shock damage, density variations, and variations in fiber coating in a full …
Date:
December 5, 1997
Creator:
Ahuja, S.; Ellingson, W. A.; Koehl, E. R. & Stuckey, J.
Object Type:
Article
System:
The UNT Digital Library
Developing and Testing an Alkaline-Side Solvent Extraction Process for Technetium Separation From Tank Waste.
Engineering development and testing of the SRTALK solvent extraction process are discussed in this paper. This process provides a way to carry out alkaline-side removal and recovery of technetium in the form of pertechnetate anion from nuclear waste tanks within the DOE complex. The SRTALK extractant consists of a crown ether, bis-4,4'(5')[(tert-butyl)cyclohexano] -18-crown-6, in a modifier, tributyl phosphate, and a diluent, Isopar{reg_sign}L. The SRTALK flowsheet given here separates technetium from the waste and concentrates it by a factor often to minimize the load on the downstream evaporator for the technetium effluent. In this work, we initially generated and correlated the technetium extraction data, measured the dispersion number for various processing conditions, and determined hydraulic performance in a single-stage 2-cm centrifugal contactor. Then we used extraction-factor analysis, single-stage contactor tests, and stage-to-stage process calculations to develop a SRTALK flowsheet. Key features of the flowsheet are (1) a low organic-to-aqueous (O/A) flow ratio in the extraction section and a high O/A flow ratio in the strip section concentrate the technetium and (2) the use of a scrub section to reduce the salt load in the concentrated technetium effluent. Finally, the SRTALK process was evaluated in a multistage test using a synthetic tank …
Date:
December 5, 1997
Creator:
Leonard, R. A.; Conner, C.; Liberatore, M. W.; Bonnesen, P. V.; Moyer, B. A.; Presley, D. J. et al.
Object Type:
Article
System:
The UNT Digital Library
Electron self-energy of high temperature superconductors as revealed by angle-resolved photoemission.
In this paper, we review some of the work our group has done in the past few years to obtain the electron self-energy of high temperature superconductors by analysis of angle-resolved photoemission data. We focus on three examples which have revealed: (1) a d-wave superconducting gap, (2) a collective mode in the superconducting state, and (3) pairing correlations in the pseudogap phase. In each case, although a novel result is obtained which captures the essence of the data, the conventional physics used leads to an incomplete picture. This indicates that new physics needs to be developed to obtain a proper understanding of these materials.
Date:
December 5, 1997
Creator:
Ding, H.; Norman, M. R. & Randeria, M.
Object Type:
Article
System:
The UNT Digital Library
Environmentally assisted cracking of LWR materials.
The effect of dissolved oxygen level on fatigue life of austenitic stainless steels is discussed and the results of a detailed study of the effect of the environment on the growth of cracks during fatigue initiation are presented. Initial test results are given for specimens irradiated in the Halden reactor. Impurities introduced by shielded metal arc welding that may affect susceptibility to stress corrosion cracking are described. Results of calculations of residual stresses in core shroud weldments are summarized. Crack growth rates of high-nickel alloys under cyclic loading with R ratios from 0.2-0.95 in water that contains a wide range of dissolved oxygen and hydrogen concentrations at 289 and 320 C are summarized.
Date:
December 5, 1997
Creator:
Chopra, O. K.; Chung, H. M.; Kassner, T. F.; Park, J. H.; Shack, W. J.; Zhang, J. et al.
Object Type:
Article
System:
The UNT Digital Library
Exchange-spring behavior in epitaxial hard/soft magnetic bilayer films.
We present results on the magnetic reversal process in epitaxial Sm-Co (1{bar 1}00)/TM (TM = Fe, Co) bilayer films prepared via magnetron sputtering onto Cr-buffered single-crystal MgO substrates. The magnetically hard Sm-Co films have 20-T uniaxial anisotropy and coercivities >3 T at room temperature. The magnetization of the soft layer is pinned at the interface to the hard-magnet layer and switches reversibly as expected for an exchange-spring magnet. With increasing soft layer thickness, the coercive field of the hard layer becomes significantly less than that of a single layer. We also present numerical solutions of a one-dimensional model that provide the spin configuration for each atomic layer. Comparison of the experimental results with the model simulations indicates that the exchange-spring behavior of our bilayer films can be understood from the intrinsic parameters of the hard and soft layers.
Date:
December 5, 1997
Creator:
Bader, S. D.; Fullerton, E. E.; Grimsditch, M.; Jiang, J. S. & Sowers, C. H.
Object Type:
Article
System:
The UNT Digital Library
Experimental results on the design for the APS PID global orbit control system.
The Advanced Photon Source third generation synchrotrons light source needs a stabilized particle beam position to produce high brightness and low emittance radiation. Global orbit correction control is introduced and is utilized to satisfy the demanding needs of the accelerator. This paper presents the experimental results for determining an effective and optimal controller to meet the global orbit correction requirements. These requirements include frequency/time domain demands consisting of vibrational noise attenuation, limiting of controller gains for stability and improving the system time response. Experiments were conducted with a digital signal processor implementing various PID sets to make comparisons between simulations and experiments. Measurements at these PID sets supported the results of software simulation.
Date:
December 5, 1997
Creator:
Chung, Y. & Kirchman, J. A.
Object Type:
Article
System:
The UNT Digital Library
First use of a laser-driven polarized H/D target at the IUCF cooler.
The HERMES Laser-Driven Target Task Force (Argonne, Erlangen and Illinois) is charged with developing a polarized H/D target for use in the HERA ring at DESY. Rapid progress was made in the beginning of 1996, leading us to the decision to test the target in a realistic experimental environment. In particular, polarizations of 0.6 and flows above 10{sup 18} atoms{center_dot}s{sup {minus}1} have been achieved on the bench. The laser-driven target and a simple detector system are currently installed in Cooler storage ring at the Indiana University Cyclotron Facility in order to test its applicability to nuclear physics experiments. Target polarizations are being measured using the {rvec H}(p, p) and {rvec D}(p, p) reactions. Initial tests were reasonably successful and the target is well along toward becoming viable for nuclear physics.
Date:
December 5, 1997
Creator:
Bailey, K.; Brack, J.; Cadman, R. V.; Cummings, W. J.; Fedchak, J.; Fox, B. et al.
Object Type:
Article
System:
The UNT Digital Library
[Funeral Program for Helena Gandy Cuffins, December 5, 1997]
Funeral program for Helena Gandy Cuffins, born August 31, 1908 and died December 2, 1997. The funeral was held December 5, 1997 at Sutton-Sutton Mortuary. Funeral arrangements were made through Sutton Sutton Mortuary.
Date:
December 5, 1997
Creator:
unknown
Object Type:
Pamphlet
System:
The Portal to Texas History
[Funeral Program for Inez Lucilla Brown Wolford, December 5, 1997]
Funeral program for Mrs. Inez Lucille Brown Wolford, born December 2, 1914 and died November 29, 1997. The funeral was held December 5, 1997 at Zion Star Missionary Baptist Church, officiated by Rev. O. L. McNary. Funeral arrangements were made by the Lewis Funeral Home, and she was buried in the Meadowlawn Memorial Park in San Antonio, Texas.
Date:
December 5, 1997
Creator:
unknown
Object Type:
Pamphlet
System:
The Portal to Texas History
Grandview Tribune (Grandview, Tex.), Vol. 103, No. 19, Ed. 1 Friday, December 5, 1997
Weekly newspaper from Grandview, Texas that includes local, state, and national news along with advertising.
Date:
December 5, 1997
Creator:
Magness, Jack, Jr.
Object Type:
Newspaper
System:
The Portal to Texas History