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275,535 Matching Results

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Results: 1 - 24 of 275,535 next
Best Match Title Creator Date Created (Newest) Date Created (Oldest) Date Added (Newest) Date Added (Oldest)
0.25mm-Thick CCD Packaging for the Dark Energy Survey Camera Array (open access)

0.25mm-Thick CCD Packaging for the Dark Energy Survey Camera Array

Abstract: The Dark Energy Survey Camera focal plane array will consist of 62 2k x 4k CCDs with a pixel size of 15 microns and a silicon thickness of 250 microns for use at wavelengths between 400 and 1000 nm. Bare CCD die will be received from the Lawrence Berkeley National Laboratory (LBNL). At the Fermi National Accelerator Laboratory, the bare die will be packaged into a custom back-side-illuminated module design. Cold probe data from LBNL will be used to select the CCDs to be packaged. The module design utilizes an aluminum nitride readout board and spacer and an Invar foot. A module flatness of 3 microns over small (1 sqcm) areas and less than 10 microns over neighboring areas on a CCD are required for uniform images over the focal plane. A confocal chromatic inspection system is being developed to precisely measure flatness over a grid up to 300 x 300 mm. This system will be utilized to inspect not only room-temperature modules, but also cold individual modules and partial arrays through flat dewar windows.
Date: 2006-06~
Creator: Derylo, Greg; Diehl, H. Thomas & Estrada, Juan
Object Type: Article
System: The UNT Digital Library
0.52eV Quaternary InGaAsSb Thermophotovoltaic Diode Technology (open access)

0.52eV Quaternary InGaAsSb Thermophotovoltaic Diode Technology

Thermophotovoltaic (TPV) diodes fabricated from 0.52eV lattice-matched InGaAsSb alloys are grown by Metal Organic Vapor Phase Epitaxy (MOVPE) on GaSb substrates. 4cm{sup 2} multi-chip diode modules with front-surface spectral filters were tested in a vacuum cavity and attained measured efficiency and power density of 19% and 0.58 W/cm{sup 2} respectively at operating at temperatures of T{sub radiator} = 950 C and T{sub diode} = 27 C. Device modeling and minority carrier lifetime measurements of double heterostructure lifetime specimens indicate that diode conversion efficiency is limited predominantly by interface recombination and photon energy loss to the GaSb substrate and back ohmic contact. Recent improvements to the diode include lattice-matched p-type AlGaAsSb passivating layers with interface recombination velocities less than 100 cm/s and new processing techniques enabling thinned substrates and back surface reflectors. Modeling predictions of these improvements to the diode architecture indicate that conversion efficiencies from 27-30% and {approx}0.85 W/cm{sup 2} could be attained under the above operating temperatures.
Date: June 9, 2004
Creator: Dashiell, M. W.; Beausang, J. F.; Nichols, G.; Depoy, D. M.; Danielson, L. R.; Ehsani, H. et al.
Object Type: Report
System: The UNT Digital Library
[1 1/2 Story Rock House, (East elevation)]

[1 1/2 Story Rock House, (East elevation)]

Photograph of the 1 1/2 Story Rock House in Hilda, Texas.
Date: June 28, 1972
Creator: Kennedy, Craig
Object Type: Photograph
System: The Portal to Texas History
[1 1/2 Story Rock House, (Northwest oblique)]

[1 1/2 Story Rock House, (Northwest oblique)]

Photograph of the 1 1/2 Story Rock House in Hilda, Texas.
Date: June 28, 1972
Creator: Kennedy, Craig
Object Type: Photograph
System: The Portal to Texas History
[1 1/2 Story Rock House, (Southeast oblique)]

[1 1/2 Story Rock House, (Southeast oblique)]

Photograph of the 1 1/2 Story Rock House in Hilda, Texas.
Date: June 28, 1972
Creator: Kennedy, Craig
Object Type: Photograph
System: The Portal to Texas History
1 1/4 quick closing gate valve for fuel oil system

1 1/4 quick closing gate valve for fuel oil system

Blueprint depicting technical details of Battleship Texas.
Date: June 26, 1926
Creator: unknown
Object Type: Technical Drawing
System: The Portal to Texas History
1.1" Ammunition Hoists - Details of Loading Tables

1.1" Ammunition Hoists - Details of Loading Tables

Blueprint depicting technical details of Battleship Texas.
Date: June 30, 1941
Creator: unknown
Object Type: Technical Drawing
System: The Portal to Texas History
1.1" Ammunition Hoists - Watertight Door & Door Frame at Top

1.1" Ammunition Hoists - Watertight Door & Door Frame at Top

Blueprint depicting technical details of Battleship Texas.
Date: June 30, 1941
Creator: unknown
Object Type: Technical Drawing
System: The Portal to Texas History
1.5" Cast Steel Swing Check Valve Standard High Pressure 101 - 300 Lbs.

1.5" Cast Steel Swing Check Valve Standard High Pressure 101 - 300 Lbs.

Blueprint depicting technical details of Battleship Texas.
Date: June 16, 1926
Creator: unknown
Object Type: Technical Drawing
System: The Portal to Texas History
L-1 (6-12-17)

L-1 (6-12-17)

Photograph of Sapulpa FD Ladder 1.
Date: June 12, 2017
Creator: unknown
Object Type: Photograph
System: The Gateway to Oklahoma History
L-1 (6-24-16)

L-1 (6-24-16)

Photograph of Sulphur FD Ladder 1.
Date: June 24, 2016
Creator: unknown
Object Type: Photograph
System: The Gateway to Oklahoma History
E-1 (6-24-16)

E-1 (6-24-16)

Photograph of Sulphur FD E-1.
Date: June 24, 2016
Creator: unknown
Object Type: Photograph
System: The Gateway to Oklahoma History
E-1 (6-28-18)

E-1 (6-28-18)

Photograph of Guymon Engine 1.
Date: June 28, 2018
Creator: unknown
Object Type: Photograph
System: The Gateway to Oklahoma History
1.25" light and heavy pressure valve

1.25" light and heavy pressure valve

Blueprint depicting technical details of Battleship Texas.
Date: June 14, 1912
Creator: unknown
Object Type: Technical Drawing
System: The Portal to Texas History
1.25" light and heavy pressure valve

1.25" light and heavy pressure valve

Blueprint depicting technical details of Battleship Texas.
Date: June 14, 1912
Creator: unknown
Object Type: Technical Drawing
System: The Portal to Texas History
1.375" High Pressure Air Cylinder For 6" Torpedo Charger

1.375" High Pressure Air Cylinder For 6" Torpedo Charger

Blueprint depicting technical details of Battleship Texas.
Date: June 25, 1910
Creator: unknown
Object Type: Technical Drawing
System: The Portal to Texas History
1- and 2-D computer analysis of an HDL stress wave switch, 1974, June 25 (open access)

1- and 2-D computer analysis of an HDL stress wave switch, 1974, June 25

None
Date: June 25, 1974
Creator: Mahler, J.
Object Type: Report
System: The UNT Digital Library
A 1 MEGAWATT POLYPHASE BOOST CONVERTER-MODULATOR FOR KLYSTRON PULSE APPLICATION (open access)

A 1 MEGAWATT POLYPHASE BOOST CONVERTER-MODULATOR FOR KLYSTRON PULSE APPLICATION

This paper describes electrical design criteria and first operational results a 140 kV, 1 MW average, 11 MW peak, zero-voltage-switching 20 kHz polyphase bridge, boost converter/modulator for klystron pulse application. The DC-DC converter derives the buss voltages from a standard 13.8 kV to 2300 Y substation cast-core transformer. Energy storage and filtering is provided by self-clearing metallized hazy polypropylene traction capacitors. Three ''H-Bridge'' Insulated Gate Bipolar Transistor (IGBT) switching networks are used to generate the polyphase 20 kHz transformer primary drive waveforms. The 20 kHz drive waveforms are chirped the appropriate duration to generate the desired klystron pulse width. PWM (pulse width modulation) of the individual 20 kHz pulses is utilized to provide regulated output waveforms with adaptive feedforward and feedback techniques. The boost transformer design utilizes amorphous nanocrystalline material that provides the required low core loss at design flux levels and switching frequencies. Resonant shunt-peaking is used on the transformer secondary to boost output voltage and resonate transformer leakage inductance. With the appropriate transformer leakage inductance and peaking capacitance, zero-voltage-switching of the IGBT's is attained, minimizing switching losses. A review of these design parameters and the first results of the performance characteristics will be presented.
Date: June 1, 2001
Creator: Reass, W. A.; Doss, J. D. & Gribble, R. F.
Object Type: Article
System: The UNT Digital Library
1-MWE Heat Exchangers for OTEC Final Design Report (open access)

1-MWE Heat Exchangers for OTEC Final Design Report

The design of a 1 MWe OTEC heat exchanger is documented, including the designs of the evaporator and associated systems, condenser, instrumentation, and materials for corrosion/erosion control and fabrication processes. (LEW)
Date: June 19, 1980
Creator: Sprouse, A.M.
Object Type: Report
System: The UNT Digital Library
1 nA beam position monitoring system (open access)

1 nA beam position monitoring system

A system has been developed at Jefferson Lab for measuring transverse position of very low current beams delivered to the Experimental Hall B of the Continuous Electron Beam Accelerator Facility (CEBAF). At the heart of the system is a position sensitive cavity operating at 1497 MHz. The cavity utilizes a unique design which achieves a high sensitivity to beam position at a relatively low cavity Q. The cavity output RF signal is processed using a down-converter and a commercial lock-in amplifier operating at 100 kHz. The system interfaces with a VME based EPICS control system using the IEEE, 488 bus. The main features of the system are simple and robust design, and wide dynamic range capable of handling beam currents from 1 nA to 1000 nA with an expected resolution better than 100 {mu}m. This paper outlines the design of the system.
Date: June 1, 1997
Creator: Ursic, R.; Flood, R. & Piller, C.
Object Type: Article
System: The UNT Digital Library
L-1 pump test (6-7-16)

L-1 pump test (6-7-16)

Photograph of ECFD Ladder 1 during a pump test at Ackley Park.
Date: June 7, 2016
Creator: unknown
Object Type: Photograph
System: The Gateway to Oklahoma History
A 1- to 5-MW, RCS-based, short-pulse spallation neutron source (open access)

A 1- to 5-MW, RCS-based, short-pulse spallation neutron source

Two accelerator configurations, the linac/compressor ring scheme and the linac/RCS scheme, are commonly used to provide the proton beam power for a short-pulse spallation neutron source. In one configuration, a full-power linac provides the beam power and a compressor ring shortens the pulse length from 1-ms down to 1 {micro}s. In the other, rapid cycling synchrotrons (RCSs) provide the beam power and also shorten the pulse length. A feasibility study of a staged approach to a 5-MW proton source utilizing RCS technology, allowing intermediate operation at 1 MW, was performed at ANL and is presented in this paper. This study is complementary to a study in progress at ORNL based on a linac and an accumulator ring. The 1-MW facility consists of a 400-MeV injector linac that delivers 0.5-mA time-averaged current, a synchrotron that accelerates the beam to 2 GeV at a 30-Hz rate, and two neutron-generating target stations. In the second phase, the 2-GeV beam is accelerated to 10 GeV by a larger RCS, increasing the facility beam power to 5 MW.
Date: June 1997
Creator: Cho, Y.; Chae, Y.-C. & Crosbie, E.
Object Type: Article
System: The UNT Digital Library
2.1 Pan-WCRP Monsoon Modelling Workshop Summary (open access)

2.1 Pan-WCRP Monsoon Modelling Workshop Summary

Ken Sperber led a discussion of the outcome of the Pan-WCRP Monsoon Modelling Workshop that was held at the University of California at Irvine from 15-17 June 2005. At the workshop presentations from key CLIVAR and GEWEX panels were presented to highlight the outstanding problems in modelling the Earth's monsoons. Additionally, presentations from invited experts were given to highlight important aspects of monsoon phenomena and processes, such as low-level jets, air-sea interaction, predictability, observational networks/studies, and model test beds etc. Since all persons attending the CLIVAR AAMP meeting were present for all, or most, of the monsoon workshop, a detailed description of the workshop presentations was not given. Rather, the discussion was focused on the recommendations of the workshop breakout groups and their relevance to CLIVAR AAMP. CLIVAR AAMP endorsed the near-term workshop recommendation of investigating the diurnal cycle using a hierarchy of models a key way forward for promoting CLIVAR/GEWEX interactions. In GCM studies CLIVAR researchers have identified the diurnal cycle as a forced ''mode'' of variability that is poorly represented in terms of amplitude and phase, especially in the case of precipitation. Typical phase errors of 6-12 hours are noted over both land and ocean in GCMs. CLIVAR …
Date: June 28, 2005
Creator: Sperber, K R
Object Type: Report
System: The UNT Digital Library
E-2 (6-7-13)

E-2 (6-7-13)

Photograph of Slaughterville E-2.
Date: June 7, 2013
Creator: unknown
Object Type: Photograph
System: The Gateway to Oklahoma History