Search Results

Advanced search parameters have been applied.
open access

Deflagration-to-detonation transition project. Quarterly report, December 1979-February 1980

Description: Progress in a project on deflagration-to-detonation transition (DDT) is reported. The activities of this project pertain primarily to the development of small, safe, low-voltage, hot-wire detonators. Its major goals are: the formulation of a modeling capability for DDT of the explosive 2-(5-cyanotetrazolato)pentaamminecobalt (III) perchlorate (CP); the development of improved DDT materials; the establishment of a data base for corrosion, compatibility, and reliability of CP-loaded detonators; a… more
Date: September 1, 1980
Creator: Lieberman, M.L. (ed.)
Partner: UNT Libraries Government Documents Department
open access

Wire-scanner recentering experiment error estimates

Description: In the wire-scanner recentering experiment, the effective center of a wire scanner is determined by turning the previous quadrupole magnet on and off. The beam is steered into the quadrupole such that it drifts to the same point somewhere on a second wire scanner downstream, for the quadrupole both on and off. With this steering, the beam is assumed to be centered at the quadrupole and first wire scanner. Approximate formulas and more exact numerical calculations show that for any incoming posi… more
Date: September 1, 1977
Creator: Swain, G.R.
Partner: UNT Libraries Government Documents Department
open access

Status of high-density fuel plates fabrication

Description: Progress has continued on the fabrication of fuel plates with fuel zone loadings approaching 9gU/cm{sup 3}. Using Hot Isostatic Pressing (HIPping) successful diffusion bonds have been made with 110 Al and 6061 Al alloys. These bonds demonstrated the most critical processing step for proof-of-concept hardware. Two types of prototype highly-loaded fuel plates have been fabricated. First, a fuel plate in which 0.030 in. (0.76 mm) uranium compound wires are bonded within an aluminum cladding and se… more
Date: September 1, 1989
Creator: Wiencek, T.C.; Domagala, R.F. & Thresh, H.R.
Partner: UNT Libraries Government Documents Department
open access

Ultra high temperature instrumentation amplifier components final report

Description: In order to develop a downhole instrumentation amplifier to support geothermal well logging without thermal protection, all the components required were tested over the temperature range of 25 to 500/sup 0/C. The components tested were ceramic vacuum tubes, resistors, capacitors, insulated hook-up wire, circuit boards, terminals, connectors, feedthroughs, thermal switch, magnet wire, and high temperature coatings and cements. Details of the tests are presented for all components. (MHR)
Date: September 1, 1977
Creator: Kelly, R.D.; Morse, C.P. & Cannon, W.L.
Partner: UNT Libraries Government Documents Department
open access

Wire rope improvement program. Final report. [For draglines]

Description: Activities in five major areas were undertaken during the WRIP: experiments using PNL-developed bend-over-sheave fatigue test machines to generate data on which to base a model for predicting large-diameter rope performance from that of small-diameter ropes; bend-over-sheave fatigue testing to determine differences in rope failure rates at varying rope loads; analyses to determine how wire ropes actually fail; development of a load sensor to record and quantity operational loads on drag and hoi… more
Date: September 1, 1981
Creator: Alzheimer, J. M.; Anderson, W. E.; Beeman, G. H.; Dudder, G. B.; Erickson, R.; Glaeser, W. A. et al.
Partner: UNT Libraries Government Documents Department
open access

Microstructure and properties of A15 superconductors formed by direct precipitation

Description: Superconducting materials were made by quenching supersaturated solutions of V-Ga and Nb-Al, deforming the quenched specimens, and then precipitating the A15 phase by aging at intermediate temperature. The critical current characteristics of the product materials depend both on the inherent properties of the A15 phase, which presumably reflect its composition, and on the details of the precipitation process, which determine the grain size, continuity, and volume fraction of the A15. These featu… more
Date: September 1, 1980
Creator: Hong, M.; Dietderich, D.R.; Wu, I.W. & Morris, J.W. Jr.
Partner: UNT Libraries Government Documents Department
open access

Investigation of Wire Motion in Superconducting Magnets

Description: The large Lorentz forces occuring during the excitation of superconducting magnets can provoke sudden motions of wire, which eventually release enough energy to trigger a quench. These wire motions are accompanied by two electromagnetic effects: an induced emf along the moved wire, and a local change in flux caused by the minute dislocation of current. Both effects cause spikes in the coil voltage. Voltage data recorded during the excitation of a superconducting quadrupole magnet which early ex… more
Date: September 1, 1990
Creator: Ogitsu, T.; Tsuchiya, K. & Devred, A.
Partner: UNT Libraries Government Documents Department
open access

Development of practical high temperature superconducting wire for electric power applications

Description: The technology of high temperature superconductivity has gone from beyond mere scientific curiosity into the manufacturing environment. Single lengths of multifilamentary wire are now produced that are over 200 meters long and that carry over 13 amperes at 77 K. Short-sample critical current densities approach 5 {times} 10{sup 4} A/cm{sup 2} at 77 K. Conductor requirements such as high critical current density in a magnetic field, strain-tolerant sheathing materials, and other engineering prope… more
Date: September 1, 1994
Creator: Hawsey, R. A.; Sokolowski, R. S.; Haldar, P. & Motowidlo, L. R.
Partner: UNT Libraries Government Documents Department
open access

Superconductivity Technology Program for electric power systems: Proceedings

Description: Twenty-seven presentations are included in viewgraph form for the wire development panel, applications development panel, and thallium workshop. Authors and affiliations are: (wire development panel) Kreoger/Christen (ORNL), Malozemoff (American Superconductor Corp.), Blaugher (National Renewable Energy Lab.), Haldar (Intermagnetics), Gray/Lanagan/Eror (ANL), Bickel/Voigt/Roth (Sandia), Tkaczyk (GE), Suenaga (BNL), Willis/Korzekwa/Maley (Los Alamos); (applications development panel) Peterson/St… more
Date: September 1, 1993
Creator: Marriott, K. B.
Partner: UNT Libraries Government Documents Department
open access

On the Development of Microstructure in a Metal Matrix Composite Using Nano-Materials

Description: Metal matrix composites (MMCs) containing matrices with nanometer grain sizes have been produced from pure aluminum nano-powders (particle sizes 50-200 nm) with SiC reinforcement (particle sizes 3-10 {micro}m). The pure Al nano-powders were produced using an exploding wire technique. Dynamic loading using a magnetic impulse technique has been used to compact the MMC to high density. The dynamic compaction process results in excellent wetting of the SiC particles by the nanocrystalline Al powder… more
Date: September 10, 2001
Creator: Popov, V A; Lesuer, D R; Kotov, I A; Ivanov, V V; Aksenov, A A; Khodos, I I et al.
Partner: UNT Libraries Government Documents Department
open access

Observations on the operation of the SEMPEX code

Description: Observations on the use of the SEMPEX computer code are given. The issues of proper sampling rate and total sampling interval are addressed. The effect that noise in the data has on the results and the ability of autocorrelation, truncation filtering, and the sliding-window technique to reduce these effects are also discussed. 35 figures, 24 tables.
Date: September 22, 1977
Creator: Hudson, H. G. & Lager, D. L.
Partner: UNT Libraries Government Documents Department
open access

Evaluation of various fabrication techniques for fabrication of fine filament NbTi superconductors

Description: The successful fabrication of a fine filament high current density NbTi superconductor can have a significant impact on the cost of the Superconducting Supercollider. Consequently, we have been exploring various approaches for fabricating this type of superconductor, in collaboration with several superconductor wire manufacturers. The techniques investigated include double conventional hot extrusion, large single stack conventional hot extrusion, large single stack conventional hot extrusion, a… more
Date: September 1, 1986
Creator: Scanlan, R. M.; Royet, J. & Hannaford, R.
Partner: UNT Libraries Government Documents Department
open access

Gold--indium diffusion in bridgewires

Description: A study being directed toward refining previous estimates of the rate of diffusion of indium into gold and of gold into lead-tin-indium solder under the conditions existing in gold bridgewire detonators is described. The study is also concerned with the effects of gold-indium intermetallic compound on the performance of detonators and methods which can determine the condition of bridgewires. The study has verified that such diffusion progresses even under room-temperature storage conditions. Da… more
Date: September 1, 1977
Creator: Harwood, W. D.
Partner: UNT Libraries Government Documents Department
open access

Nanostructured High Performance Ultraviolet and Blue Light Emitting Diodes for Solid State Lighting

Description: We report on research results in this project which synergize advanced material science approaches with fundamental optical physics concepts pertaining to light-matter interaction, with the goal of solving seminal problems for the development of very high performance light emitting diodes (LEDs) in the blue and near ultraviolet for Solid State Lighting applications. Accomplishments in the second 12 month contract period include (i) new means of synthesizing AlGaN and InN quantum dots by droplet… more
Date: September 30, 2005
Creator: Nurmikko, Arto V. & Han, Jung
Partner: UNT Libraries Government Documents Department
open access

Ultrasonic aluminum wire bonding. Final report

Description: An aluminum wire bonding process was developed. Techniques were developed for bonding large diameter wire to a power transistor and evaporated gold. Bond schedules were made to be used in producing hybrid microcircuits. Calibration techniques utilizing an elctromagnetic transducer to measure tool movement proved successful. The magnetic transducer is best suited as a trouble-shooting tool.
Date: September 1, 1980
Creator: Sim, J.R.
Partner: UNT Libraries Government Documents Department
open access

A model for the prediction of Nb sub 3 Sn critical current as a function of field, temperature, strain, and radiation damage

Description: Conductors designed for fusion machines must operate at high fields, under large mechanical loads, and in a high neutron flux. Present designs favor the use of Nb{sub 3}Sn with force-cooling by supercritical helium to extract large nuclear and ac loss heat loads. Consequently, the magnet designer must have a good knowledge of the critical current of the superconductor as a function of field, strain, temperature, and radiation damage. Expanding on work by Hampshire, et al. and Ekin, combined wit… more
Date: September 21, 1990
Creator: Summers, L. T.; Guinan, M. W.; Miller, J. R. & Hahn, P. A.
Partner: UNT Libraries Government Documents Department
open access

A characterization of internal-Sn Nb sub 3 Sn superconductors for use in the Proof of Principles (PoP) coil

Description: High performance Ti-alloyed internal-Sn superconductors have been selected for use in the Proof of Principles (PoP) coil, and a 1.0 m o.d., 0.4 m i.d., solenoid designed to produce fields up to 15 T. The PoP coil, which will use forced-flow Cable-In-Conduit Conductors (CICC), will operate at 4.2 K and moderate levels of conductor strain. Here we report the results of detailed characterizations of two proposed PoP coil Nb{sub 3}Sn 19 subelement superconductor wires of different topology. We have… more
Date: September 21, 1990
Creator: Summers, L. T.; Duenas, A. R.; Karlsen, C. E.; Ozeryansky, G. M. & Gregory, E.
Partner: UNT Libraries Government Documents Department
open access

The effects of filament magnetization in superconducting magnets as calculated by POISSON

Description: Magnetization of superconducting material can be introduced into POISSON through a field dependent permeability table (in the same way that iron characteristics are introduced). This can be done by representing measured magnetization data of the increasing and decreasing field by two independent B-..gamma.. curves (..gamma.. = 1/..mu..). Magnetization curves of this type were incorporated into the current regions of the program POISSON and their effect on the field coefficients observed. We hav… more
Date: September 1, 1986
Creator: Caspi, S.; Gilbert, W. S.; Helm, M. & Laslett, L. J.
Partner: UNT Libraries Government Documents Department
open access

Self assembly: An approach to terascale integration

Description: Surely one of the most remarkable accomplishments of modern times has been the miniaturization of electronic components, starting with discrete transistors and leading to Very Large Scale Integrated (VLSI) Circuits which will soon contain almost 100 million components in a few square centimeters. It led to an information processing industry that fuels almost every aspect of industrial societies and that has brought manifold benefits to their citizens. Although continuation of the miniaturizatio… more
Date: September 1, 1993
Creator: Singer, S.
Partner: UNT Libraries Government Documents Department
open access

Layered Electrical Product Application Protocol (AP). Draft: Initial Graphics Exchange Specification (IGES)

Description: An application protocol is an information systems engineering view of a specific product. The view represents an agreement on the generic activities needed to design and fabricate the product, the agreement on the information needed to support those activities, and the specific constructs of a product data standard for use in transfering some or all of the information required. This applications protocol describes the data for electrical and electronic products in terms of a product description… more
Date: September 1, 1994
Partner: UNT Libraries Government Documents Department
open access

ABCXYZ: vector potential (A) and magnetic field (B) code (C) for Cartesian (XYZ) geometry using general current elements. [In LRL TRAN for CDC > 600 computer]

Description: ABCXYZ is a computer code for obtaining the Cartesian components of the vector potential and the magnetic field on an observed grid from an arrangement of current-carrying wires. Arbitrary combinations of straight line segments, arcs, and loops are allowed in the specification of the currents. Arbitrary positions and orientations of the current-carrying elements are also allowed. Specification of the wire diameter permits the computation of well-defined fields, even in the interiors of the cond… more
Date: September 14, 1976
Creator: Anderson, D. V.; Breazeal, J.; Finan, C. H. & Johnston, B. M.
Partner: UNT Libraries Government Documents Department
Back to Top of Screen