245 Matching Results

This system will be undergoing maintenance April 18th between 9:00AM and 12:00PM CDT.

Search Results

Advanced search parameters have been applied.
in subjects: "engineering"  
Results: 1 - 24 next
open access

Choosing and implementing a computer system for plant lubrication: Nine steps to success

Description: Rapid advances in computer software offer may opportunities for increasing efficiency and productivity; however, choosing the right software package and achieving its full potential can be a challenging task. Lubrication engineers faced with the selection and implementation of a computer system will find that they can increase their chance of success when they follow the nine steps outlined in this paper. These steps provide a solid framework for managing the project through its full life-cycle… more
Date: April 3, 1991
Creator: Nook, J. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Removable, hermetically-sealing, filter attachment system for hostile environments

Description: A removable and reusable filter attachment system is disclosed. A filter medium is fixed to, and surrounded by, a filter frame having a coaxial, longitudinally extending, annular rim. The rim engages an annular groove which surrounds the opening of a filter housing. The annular groove contains a fusible material and a heating mechanism for melting the fusible material. Upon resolidifying, the fusible material forms a hermetic bond with the rim and groove. Remelting allows detachment and replace… more
Date: June 3, 1981
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
open access

Two-component flow study in large-diameter horizontal pipe

Description: Westinghouse Savannah River Company, Idaho National Engineering Laboratory, and Wyle Laboratory cooperated in a series of single- and two-component calibration tests conducted to obtain sufficient information for calibrating flowmeters, to observe flow patterns, and to estimate void functions. Testing, conducted in large-diameter horizontal pipe, covered total flows of 0.19 to 1.89 m{sup 3}/s (3000 to 30000 gpm) and inlet void fractions up to 40%. A flow regime map, constructed using video imag… more
Date: December 3, 1991
Creator: Eghbali, D. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

High-voltage coaxial switch

Description: A coaxial high voltage, high current switch having a solid cylindrical cold cathode coaxially surrounded by a thin hollow cylindrical inner electrode and a larger hollow cylindrical outer electrode is described. A high voltage trigger between the cathode and the inner electrode causes electrons to be emitted from the cathode and flow to the inner electrode preferably through a vacuum. Some of the electrons penetrate the inner electrode and cause a volumetric discharge in the gas (which may be m… more
Date: June 3, 1981
Creator: Rink, J. P.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
open access

Engineering of beam direct conversion for a 120-kV, 1-MW ion beam

Description: Practical systems for beam direct conversion are required to recover the energy from ion beams at high efficiency and at very high beam power densities in the environment of a high-power, neutral-injection system. Such an experiment is now in progress using a 120-kV beam with a maximum total current of 20 A. After neutralization, the H/sup +/ component to be recovered will have a power of approximately 1 MW. A system testing these concepts has been designed and tested at 15 kV, 2 kW in preparat… more
Date: October 3, 1977
Creator: Barr, W. L.; Doggett, J. N.; Hamilton, G. W.; Kinney, J. D. & Moir, R. W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Raft River condenser-tube examination

Description: In the program of development of a water treatment for the 5 MW Raft River power plants' carbon steel heat rejection system, four carbon steel tubes were analyzed in this batch. The results of visual and scanning electron microscope examination of the tubes are presented. (MHR)
Date: April 3, 1981
Creator: Suciu, D. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Cassette blanket and vacuum building: key elements in fusion reactor maintenance

Description: The integration of two concepts important to fusion power reactors is discussed. The first concept is the vacuum building which improves upon the current fusion reactor designs. The second concept, the use of the cassette blanket within the vacuum building environment, introduces four major improvements in blanket design: cassette blanket module, zoning concept, rectangular blanket concept, and internal tritium recovery. (MHR)
Date: October 3, 1977
Creator: Werner, R.W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Design guidance for fracture-critical components at Lawrence Livermore National Laboratory

Description: Fracture is an important design consideration for components whose sudden and catastrophic failure could result in a serious accident. Elements of fracture control and fracture mechanics design methods are reviewed. Design requirements, which are based on the consequences of fracture of a given component, are subsequently developed. Five categories of consequences are defined. Category I is the lowest risk, and relatively lenient design requirements are employed. Category V has the highest pote… more
Date: March 3, 1982
Creator: Streit, R. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Control of temperature and heat flux in a combustor using coal-derived gas of varying heat content. [Patent application]

Description: The present invention is directed to a fuel-air control system for a combustor in which coal-derived gas of varying heat content is used. To maintain the temperature in the combustor at an essentially constant value the fuel-to-air ratio is adjusted by using a temperature actuated variable pressure regulator in the gas feed line to compensate for the variability of the heat content of the gas. The velocity of the products of combustion is maintained at an essentially constant flow rate by contr… more
Date: June 3, 1981
Creator: Loth, John L.; Nakaishi, Curtis V.; Carpenter, Larry K. & Bird, Jimmie D.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
open access

Progress and prospects for soft x-ray lasing driven by high power optical lasers

Description: We will describe our optical laser pumped xuv Laser Program. To date, we have concentrated our efforts on exploding foil amplifier designs using Ne-like n=3p to 3s inversion schemes. We will describe our latest modeling results as well as measurements which demonstrate output power near the 1 MW level at 206 and 209 A and lasing at wavelengths as short as 106 A.
Date: July 3, 1986
Creator: Rosen, M.D.; Matthews, D.L. & Hagelstein, P.L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Plasma engineering models of tandem mirror devices with high-field test-cell inserts

Description: Plasma physics and engineering models of tandem mirror devices operated with a high-field technology test-cell insert in the central cell, which have been incorporated recently in the TMRBAR tandem mirror reactor physics code, are described. The models include particle and energy balance in the test-cell region as well as the interactions between the test-cell particles and those flowing through the entire device. The code calculations yield consistent operating parameters for the test-cell, ce… more
Date: April 3, 1985
Creator: Fenstermacher, M.E. & Campbell, R.B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Software Engineering Processes Used to Develop the NIF Integrated Computer Control System

Description: We have developed a new target platform to study Laser Plasma Interaction in ignition-relevant condition at the Omega laser facility (LLE/Rochester)[1]. By shooting an interaction beam along the axis of a gas-filled hohlraum heated by up to 17 kJ of heater beam energy, we were able to create a millimeter-scale underdense uniform plasma at electron temperatures above 3 keV. Extensive Thomson scattering measurements allowed us to benchmark our hydrodynamic simulations performed with HYDRA [1]. As… more
Date: October 3, 2007
Creator: Ludwigsen, A P; Carey, R W; Demaret, R D; Lagin, L J; Reddi, U P & Van Arsdall, P J
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

DOE Award No. DE-FC36-03GO13108 Novel Non-Precious Metal Catalysts for PEMFC: Catalyst Selection Through Molecular Modeling and Durability Studies Final Report (September 2003 – October 2008)

Description: The objective of this project is to develop novel non-precious metal electrocatalysts for oxygen reduction reaction (ORR), and demonstrate the potential of the catalysts to perform at least as good as conventional Pt catalysts currently in use in polymer electrolyte membrane fuel cell (PEMFC) with a cost at least 50 % less than a target of 0.2 g (Pt loading)/peak kW and with durability > 2,000 h operation with less than 10 % power degradation. A novel nitrogen-modified carbon-based catalyst was… more
Date: March 3, 2009
Creator: Popov, Branko N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Local Area Signal-to-Noise Ratio (LASNR) algorithm for Image Segmentation

Description: Many automated image-based applications have need of finding small spots in a variably noisy image. For humans, it is relatively easy to distinguish objects from local surroundings no matter what else may be in the image. We attempt to capture this distinguishing capability computationally by calculating a measurement that estimates the strength of signal within an object versus the noise in its local neighborhood. First, we hypothesize various sizes for the object and corresponding background … more
Date: July 3, 2007
Creator: Kegelmeyer, L; Fong, P; Glenn, S & Liebman, J
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Target Diagnostic Instrument-Based Controls Framework for the National Ignition Facility (NIF)

Description: The extreme physics of targets shocked by NIF's 192-beam laser are observed by a diverse suite of diagnostics including optical backscatter, time-integrated and gated X-ray sensors, and laser velocity interferometry. Diagnostics to diagnose fusion ignition implosion and neutron emissions are being planned. Many diagnostics will be developed by collaborators at other sites, but ad hoc controls could lead to unreliable and costly operations. An instrument-based controls (I-BC) framework for both … more
Date: October 3, 2007
Creator: Shelton, R. T.; O'Brien, D. W.; Kamperschroer, J. H. & Nelson, J. R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The Mercury Project: A High Average Power, Gas-Cooled Laser For Inertial Fusion Energy Development

Description: Hundred-joule, kilowatt-class lasers based on diode-pumped solid-state technologies, are being developed worldwide for laser-plasma interactions and as prototypes for fusion energy drivers. The goal of the Mercury Laser Project is to develop key technologies within an architectural framework that demonstrates basic building blocks for scaling to larger multi-kilojoule systems for inertial fusion energy (IFE) applications. Mercury has requirements that include: scalability to IFE beamlines, 10 H… more
Date: November 3, 2006
Creator: Bayramian, A.; Armstrong, P.; Ault, E.; Beach, R.; Bibeau, C.; Caird, J. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Using Laser Entrance Hole Shields to Increase Coupling Efficiency in Indirect Drive Ignition Targets for the National Ignition Facility (NIF)

Description: Coupling efficiency, the ratio of the capsule absorbed energy to the driver energy, is a key parameter in ignition targets. The hohlraum originally proposed for NIF coupled {approx}11% of the absorbed laser energy to the capsule as x-rays. We describe here a second generation of hohlraum target which has higher coupling efficiency, {approx}16%. Because the ignition capsule's ability to withstand 3D effects increases rapidly with absorbed energy, the additional energy can significantly increase … more
Date: November 3, 2005
Creator: Callahan, D. A.; Amendt, P. A.; Dewald, E. L.; Haan, S. W.; Hinkel, D. E.; Izumi, N. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

CAD Model and Visual Assisted Control System for NIF Target Area Positioners

Description: The National Ignition Facility (NIF) target chamber contains precision motion control systems that reach up to 6 meters into the target chamber for handling targets and diagnostics. Systems include the target positioner, an alignment sensor, and diagnostic manipulators (collectively called positioners). Target chamber shot experiments require a variety of positioner arrangements near the chamber center to be aligned to an accuracy of 10 micrometers. Positioners are some of the largest devices i… more
Date: October 3, 2007
Creator: Tekle, E. A.; Wilson, E. F. & Paik, T. S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Nanoscale Synthesis and Characterization Laboratory Annual Report 2005

Description: The Nanoscale Synthesis and Characterization Laboratory's (NSCL) primary mission is to create and advance interdisciplinary research and development opportunities in nanoscience and technology. The initial emphasis of the NSCL has been on development of scientific solutions in support of target fabrication for the NIF laser and other stockpile stewardship experimental platforms. Particular emphasis has been placed on the design and development of innovative new materials and structures for use … more
Date: January 3, 2006
Creator: Hamza, A V & Lesuer, D R
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Electrical and Optical Gain Lever Effects in InGaAs Double Quantum Well Diode Lasers

Description: In multisection laser diodes, the amplitude or frequency modulation (AM or FM) efficiency can be improved using the gain lever effect. To study gain lever, InGaAs double quantum well (DQW) edge emitting lasers have been fabricated with integrated passive waveguides and dual sections providing a range of split ratios from 1:1 to 9:1. Both the electrical and the optical gain lever have been examined. An electrical gain lever with greater than 7 dB enhancement of AM efficiency was achieved within … more
Date: January 3, 2007
Creator: Pocha, M D; Goddard, L L; Bond, T C; Nikolic, R J; Vernon, S P; Kallman, J S et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

NIF ICCS Test Controller for Automated & Manual Testing

Description: The National Ignition Facility (NIF) Integrated Computer Control System (ICCS) is a large (1.5 MSLOC), hierarchical, distributed system that controls all aspects of the NIF laser [1]. The ICCS team delivers software updates to the NIF facility throughout the year to support shot operations and commissioning activities. In 2006, there were 48 releases of ICCS: 29 full releases, 19 patches. To ensure the quality of each delivery, thousands of manual and automated tests are performed using the ICC… more
Date: October 3, 2007
Creator: Zielinski, J S
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Experiences with Opto-Mechanical Systems that Affect Optical Surfaces at the Sub-Nanometer Level

Description: Projection optical systems built for Extreme Ultraviolet Lithography (EUVL) demonstrated the ability to produce, support and position reflective optical surfaces for achieving transmitted wavefront errors of 1 nm or less. Principal challenges included optical interferometry, optical manufacturing processes, multi-layer coating technology and opto mechanics. Our group was responsible for designing, building and aligning two different projection optical systems: a full-field, 0.1 NA, four-mirror … more
Date: April 3, 2008
Creator: Hale, L C & Taylor, J S
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Photonic MEMS for NIR in-situ

Description: We report on a novel sensing technique combining photonics and microelectromechanical systems (MEMS) for the detection and monitoring of gas emissions for critical environmental, medical, and industrial applications. We discuss how MEMS-tunable vertical-cavity surface-emitting lasers (VCSELs) can be exploited for in-situ detection and NIR spectroscopy of several gases, such as O{sub 2}, N{sub 2}O, CO{sub x}, CH{sub 4}, HF, HCl, etc., with estimated sensitivities between 0.1 and 20 ppm on footpr… more
Date: July 3, 2007
Creator: Bond, T C; Cole, G D; Goddard, L L & Behymer, E
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
Back to Top of Screen