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255,204 Matching Results

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Results: 1 - 24 of 255,204 next
Best Match Title Creator Date Created (Newest) Date Created (Oldest) Date Added (Newest) Date Added (Oldest)
0-G experiments with advanced ceramic fabric wick structures (open access)

0-G experiments with advanced ceramic fabric wick structures

Both Air Force and NASA future spacecraft thermal management needs span the temperature range from cryogenic to liquid metals. Many of these needs are changing and not well defined and will remain so until goals, technology, and missions converge. Nevertheless, it is certain that high-temperature (> 800 K) and medium-temperature (about 450 K) radiator systems will have to be developed that offer significant improvements over current designs. This paper discusses experiments performed in the lower temperature regime as part of a comprehensive advanced ceramic fabric (ACF) heat pipe development program. These experiments encompassed wicking tests with various ceramic fabric samples, and heat transfer tests with a 1-m long prototype ACF water heat pipe. A prototype ceramic fabric/titanium water heat pipe has been constructed and tested; it transported up to 60 W of power at about 390 K. Startup and operation both with and against gravity examined. Wick testing was begun to aid in the design and construction of an improved prototype heat pipe, with a 38-{mu}m stainless steel linear covered by a biaxially-braided Nextel (trademark of the 3M Co., St. Paul, Minnesota) sleeve that is approximately 300-{mu}m thick. Wick testing took place in 1-g; limited testing in 0-g was initiated, …
Date: July 1991
Creator: Antoniak, Z. I.; Webb, B. J.; Bates, J. M.; Cooper, M. F. & Pauley, K. A.
Object Type: Article
System: The UNT Digital Library
1.1" Ammunition Hoists - Data for Assembly of Hoists

1.1" Ammunition Hoists - Data for Assembly of Hoists

Blueprint depicting technical details of Battleship Texas.
Date: July 19, 1941
Creator: unknown
Object Type: Technical Drawing
System: The Portal to Texas History
1. 2-GeV damping-ring complex for the Stanford Linear Collider (open access)

1. 2-GeV damping-ring complex for the Stanford Linear Collider

The choice of parameters, the design, a 2-1/2 year consruction program and the early operation of a high field, high tune research and development damping ring complex for one of the two linear collider beams are described.
Date: July 1983
Creator: Fischer, G. E.; Davies-White, W.; Fieguth, T. & Wiedemann, H.
Object Type: Article
System: The UNT Digital Library
1.5-GEV FFAG ACCELERATOR AS INJECTOR TO THE BNL-AGS. (open access)

1.5-GEV FFAG ACCELERATOR AS INJECTOR TO THE BNL-AGS.

A 1.5-GeV Fixed-Field Alternating-Gradient (FFAG) proton Accelerator is being studied as a new injector to the Alternating-Gradient Synchrotron (AGS) of Brookhaven National Laboratory (BNL). The major benefit is that it would considerably shorten the overall AGS acceleration cycle, and, consequently, may yield to an improvement of beam stability, intensity and size. The AGS-FFAG will also facilitate the proposed upgrade of the AGS facility toward a 1-MW average proton beam power at the top energy of 28 GeV. This paper describes the FFAG design for acceleration of protons from 400 MeV to 1.5 GeV, with the same circumference of the AGS, and entirely housed in the AGS tunnel.
Date: July 5, 2004
Creator: Ruggiero, A. G.; Blaskiewicz, M.; Trbojevic, D.; Tsoupas, N. & Zhang, W.
Object Type: Article
System: The UNT Digital Library
1/5-scale experiment of a Mark I boiling-water reactor pressure-suppression system under hypothetical LOCA conditions (open access)

1/5-scale experiment of a Mark I boiling-water reactor pressure-suppression system under hypothetical LOCA conditions

Experimental results show the sensitivity of hydrodynamically generated vertical loads to changes in the drywell pressurization rate, downcomer submergence, and vent-line loss coefficient. Insignificant effects on peak vertical loads were observed when the vent-line loss was varied. Peak vertical loads can be reduced by adding initial drywell overpressure so that the downcomers are partly cleared of water. Spatial variation of pressure at about the time of vent clearing is seen in comparisons of data from locations along the axis of the toroidal wetwell.
Date: July 8, 1977
Creator: Pitts, J. H. & McCauley, E. W.
Object Type: Article
System: The UNT Digital Library
1.06 μm 150 psec laser damage study of diamond turned, diamond turned/ polished and polished metal mirrors (open access)

1.06 μm 150 psec laser damage study of diamond turned, diamond turned/ polished and polished metal mirrors

Using a well characterized 1.06 μm 150 ps glass laser pulse the damage characteristics for diamond turned, diamond turned/ polished, and polished copper and silver mirrors less than 5 cm diameter were studied. Although most samples were tested with a normal angle of incidence, some were tested at 45$sup 0$ with different linear polarization showing an increase in damage threshold for S polarization. Different damage mechanisms observed will be discussed. Laser damage is related to residual surface influences of the fabrication process. First attempts to polish diamond turned surfaces resulted in a significant decrease in laser damage threshold. The importance of including the heat of fusion in the one dimensional heat analysis of the theoretical damage threshold and how close the samples came to the theoretical damage threshold is discussed. (auth)
Date: July 24, 1975
Creator: Saito, T. T.; Milam, D.; Baker, P. & Murphy, G.
Object Type: Article
System: The UNT Digital Library
L-1 (7-8-17)

L-1 (7-8-17)

Photograph of Stroud Ladder 1.
Date: July 8, 2017
Creator: unknown
Object Type: Photograph
System: The Gateway to Oklahoma History
E-1 (7-8-17)

E-1 (7-8-17)

Photograph of Stroud Engine 1.
Date: July 8, 2017
Creator: unknown
Object Type: Photograph
System: The Gateway to Oklahoma History
E-1 (7-10-14)

E-1 (7-10-14)

Photograph of Norman FD Engine 1.
Date: July 10, 2014
Creator: unknown
Object Type: Photograph
System: The Gateway to Oklahoma History
E-1 (7-19-17)

E-1 (7-19-17)

Photograph of Slaughterville E-1.
Date: July 19, 2017
Creator: unknown
Object Type: Photograph
System: The Gateway to Oklahoma History
E-1 (7-25-20)

E-1 (7-25-20)

Photograph of Gotebo FD Engine 1.
Date: July 25, 2020
Creator: unknown
Object Type: Photograph
System: The Gateway to Oklahoma History
1.375" High Pressure Piston For 6" Stroke 30 Cu Ft, 2500LB, Torpedo Charger

1.375" High Pressure Piston For 6" Stroke 30 Cu Ft, 2500LB, Torpedo Charger

Blueprint depicting technical details of Battleship Texas.
Date: July 7, 1910
Creator: unknown
Object Type: Technical Drawing
System: The Portal to Texas History
E-1 2005 Kenworth (7-10-21)

E-1 2005 Kenworth (7-10-21)

Photograph of Porter FD E-1, a 2005 Kenworth/HME Silverfox.
Date: July 10, 2021
Creator: unknown
Object Type: Photograph
System: The Gateway to Oklahoma History
E-1 Common Analog Model (U) (open access)

E-1 Common Analog Model (U)

This report is the descriptive description of the E-1 common analog model
Date: July 1, 1969
Creator: unknown
Object Type: Report
System: The UNT Digital Library
1. K+ Charge Exchange - Search For K+ Charge Exchange (open access)

1. K+ Charge Exchange - Search For K+ Charge Exchange

An experiment was designed utilizing a charge-exchange reaction to study the decay and interactions of the neutral K mesons produced. The experiment produced no events that could be interpreted as either the decay or interaction of neutral K mesons. The nature of the experiment and the possible explanations of this unexpected result are presented in this paper.
Date: July 29, 1959
Creator: Birge, Robert W.; Courant, Hans J.; Lanou, Robert E., Jr. & Whitehead, Marian N.
Object Type: Report
System: The UNT Digital Library
E-1 pump test (7-7-18)

E-1 pump test (7-7-18)

Photograph of Lexington FD Engine 1 during a pump test at Purcell Lake.
Date: July 7, 2018
Creator: unknown
Object Type: Photograph
System: The Gateway to Oklahoma History
E-1 Reserve (7-10-2019)

E-1 Reserve (7-10-2019)

Photograph of Yukon FD reserve Engine 1.
Date: July 10, 2019
Creator: unknown
Object Type: Photograph
System: The Gateway to Oklahoma History
1" Standard Drain Cock 300 Lbs. Pressure [Boiler]

1" Standard Drain Cock 300 Lbs. Pressure [Boiler]

Blueprint depicting technical details of Battleship Texas.
Date: July 3, 1930
Creator: unknown
Object Type: Technical Drawing
System: The Portal to Texas History
2-1/2-D electromagnetic modeling of nodular defects in high-power multilayer optical coatings (open access)

2-1/2-D electromagnetic modeling of nodular defects in high-power multilayer optical coatings

Advances in the design and production of high damage threshold optical coatings for use in mirrors and polarizers have been driven by the design requirements of high-power laser systems such as the proposed 1.8-MJ National Ignition Facility (NIF) and the prototype 12- kJ Beamlet laser system. The present design of the NIF will include 192 polarizers and more than 1100 mirrors. Currently, the material system of choice for high-power multilayer optical coatings with high damage threshold applications near 1.06 {mu}m are e-beam deposited HfO{sub 2}/Si0{sub 2} coatings. However, the optical performance and laser damage thresholds of these coatings are limited by micron-scale defects and insufficient control over layer thickness. In this report, we will discuss the results of our 2-1/2-D finite-element time- domain (FDTD) EM modeling effort for rotationally-symmetric nodular defects in multilayer dielectric HR coatings. We have added a new diagnostic to the 2-1/2-D FDTD EM code, AMOS, that enables us to calculate the peak steady-state electric fields throughout a 2-D planar region containing a 2-D r-z cross-section of the axisymmetric nodular defect and surrounding multilayer dielectric stack. We have also generated a series of design curves to identify the range of loss tangents for Si0{sub 2} and HfO{sub …
Date: July 1996
Creator: Molau, N. E.; Brand, H. R.; Kozlowski, M. R. & Shang, C. C.
Object Type: Report
System: The UNT Digital Library
(2,2-Bipyridyl)bis(eta5-1,2,3,4,5-pentamethylcyclopentadienyl)Strontium(II) (open access)

(2,2-Bipyridyl)bis(eta5-1,2,3,4,5-pentamethylcyclopentadienyl)Strontium(II)

In the title compound, the Sr-N distances are 2.624 (3) and 2.676 (3) Angstroms. The Sr-centroid distances are 2.571 and 2.561 Angstroms. The N-C-C-N torsion angle in the bipyridine ligand is 2.2 (4){sup o}. Interestingly, the bipyridine ligand is tilted. The angle between the plane defined by Sr1, N1 and N2 and the plane defined by the 12 atoms of the bipyridine ligand is 10.7{sup o}.
Date: July 3, 2008
Creator: Kazhdan, Daniel; Kazhdan, Daniel; Hu, Yung-Jin; Kokai, Akos; Levi, Zerubba & Rozenel, Sergio
Object Type: Article
System: The UNT Digital Library
E-2 (7-7-17)

E-2 (7-7-17)

Photograph of Norman FD Engine 2.
Date: July 7, 2017
Creator: unknown
Object Type: Photograph
System: The Gateway to Oklahoma History
2-D ACAR measurements of Ni/sub 3/A1 (open access)

2-D ACAR measurements of Ni/sub 3/A1

In connection with a detailed study of the electronic structure and stability of the aluminides (Ni,Fe)/sub 3/Al, 2-D ACAR positron annihilation measurements were made on a Ni/sub 3/Al single crystal to study the Fermi surface. The results for Ni/sub 3/Al have been compared with results for pure Ni. Strong similarities were found for the electronic structures of these materials. Theoretical calculations of the Fermi surface for Ni/sub 3/Al are in good agreement with the experimental results. The GAMMA/sub 16/ sheet, not previously observed in any experiment, has now been observed for the first time in Ni/sub 3/Al. 14 refs., 10 figs.
Date: July 1987
Creator: Smedskjaer, L. C.; DasGupta, A.; Legnini, D. G. & Stahulak, M. D.
Object Type: Report
System: The UNT Digital Library
A 2-D imaging heat-flux gauge (open access)

A 2-D imaging heat-flux gauge

This report describes a new leadless two-dimensional imaging optical heat-flux gauge. The gauge is made by depositing arrays of thermorgraphic-phosphor (TP) spots onto the faces of a polymethylpentene is insulator. In the first section of the report, we describe several gauge configurations and their prototype realizations. A satisfactory configuration is an array of right triangles on each face that overlay to form squares when the gauge is viewed normal to the surface. The next section of the report treats the thermal conductivity of TPs. We set up an experiment using a comparative longitudinal heat-flow apparatus to measure the previously unknown thermal conductivity of these materials. The thermal conductivity of one TP, Y{sub 2}O{sub 3}:Eu, is 0.0137 W/cm{center dot}K over the temperature range from about 300 to 360 K. The theories underlying the time response of TP gauges and the imaging characteristics are discussed in the next section. Then we discuss several laboratory experiments to (1) demonstrate that the TP heat-flux gauge can be used in imaging applications; (2) obtain a quantum yield that enumerates what typical optical output signal amplitudes can be obtained from TP heat-flux gauges; and (3) determine whether LANL-designed intensified video cameras have sufficient sensitivity to acquire …
Date: July 1, 1991
Creator: Noel, B.W.; Borella, H.M. (Los Alamos National Lab., NM (United States)); Beshears, D.L.; Sartory, W.K.; Tobin, K.W.; Williams, R.K. (Oak Ridge National Lab., TN (United States)) et al.
Object Type: Report
System: The UNT Digital Library
2-D Imaging of Electron Temperature in Tokamak Plasmas (open access)

2-D Imaging of Electron Temperature in Tokamak Plasmas

By taking advantage of recent developments in millimeter wave imaging technology, an Electron Cyclotron Emission Imaging (ECEI) instrument, capable of simultaneously measuring 128 channels of localized electron temperature over a 2-D map in the poloidal plane, has been developed for the TEXTOR tokamak. Data from the new instrument, detailing the MHD activity associated with a sawtooth crash, is presented.
Date: July 8, 2004
Creator: Munsat, T.; Mazzucato, E.; Park, H.; Domier, C. W.; Johnson, M.; Luhmann, N. C. Jr. et al.
Object Type: Report
System: The UNT Digital Library