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0.5 μm E/D AlGaAs/GaAs heterostructure field effect transistor technology with DFET threshold adjust implant (open access)

0.5 μm E/D AlGaAs/GaAs heterostructure field effect transistor technology with DFET threshold adjust implant

A doped-channel heterostructure field effect transistor (H-FET) technology has been developed with self-aligned refractory gate processing and using both enhancement- and depletion-mode transistors. D-HFET devices are obtained with a threshold voltage adjust implant into material designed for E-HFET operation. Both E- and D-HFETs utilize W/WSi bilayer gates, sidewall spacers, and rapid thermal annealing for controlling short channel effects. The 0.5 {mu}m E- HFETs (D-HFETs) have been demonstrated with transconductance of 425 mS/mm (265-310 mS/mm) and f{sub t} of 45-50 GHz. Ring oscillator gate delays of 19 ps with a power of 0.6 mW have been demonstrated using direct coupled FET logic. These results are comparable to previous doped-channel HFET devices and circuits fabricated by selective reactive ion etching rather than ion implantation for threshold voltage adjustment.
Date: April 1997
Creator: Baca, A. G.; Sherwin, M. E.; Zolper, J. C.; Shul, R. J.; Briggs, R. D.; Heise, J. A. et al.
Object Type: Article
System: The UNT Digital Library

1", 1.5", 2" cylinder relief valves

Blueprint depicting technical details of Battleship Texas.
Date: April 23, 1914
Creator: unknown
Object Type: Technical Drawing
System: The Portal to Texas History

1.1" Ammunition Clipping Room on Signal Bridge

Blueprint depicting technical details of Battleship Texas.
Date: April 12, 1941
Creator: unknown
Object Type: Technical Drawing
System: The Portal to Texas History

1.1" Ammunition Clipping Room on Signal Bridge

Blueprint depicting technical details of Battleship Texas.
Date: April 12, 1941
Creator: unknown
Object Type: Technical Drawing
System: The Portal to Texas History

1.1" Ammunition Clipping Room on Signal Bridge

Blueprint depicting technical details of Battleship Texas.
Date: April 12, 1941
Creator: unknown
Object Type: Technical Drawing
System: The Portal to Texas History

1.1" Ammunition Hoist - Trunks

Blueprint depicting technical details of Battleship Texas.
Date: April 10, 1941
Creator: unknown
Object Type: Technical Drawing
System: The Portal to Texas History

1.1" Ammunition Hoist - Trunks [BB-34]

Blueprint depicting technical details of Battleship Texas.
Date: April 10, 1941
Creator: unknown
Object Type: Technical Drawing
System: The Portal to Texas History
1.1 Simulations of a Free-Electron Laser Oscillator at Jefferson Lab Lasing in the Vacuum Ultraviolet (open access)

1.1 Simulations of a Free-Electron Laser Oscillator at Jefferson Lab Lasing in the Vacuum Ultraviolet

This report is a descriptive summary of the simulation of a free- electron laser Oscillator at Jefferson Lab Lasing in the Vacuum Ultraviolet
Date: April 1, 2013
Creator: Shinn, Michelle D. & Benson, Stephen V.
Object Type: Article
System: The UNT Digital Library

E-1 (4-15-15)

Photograph of Lexington FD Engine 1 on a wet surface. Photo taken in Purcell, OK.
Date: April 15, 2015
Creator: unknown
Object Type: Photograph
System: The Gateway to Oklahoma History

E-1 (4-15-18)

Photograph of Cloud Chief FD E-1. Photo taken in Cordell, OK.
Date: April 15, 2018
Creator: unknown
Object Type: Photograph
System: The Gateway to Oklahoma History

E-1 (4-20-18)

Photograph of Purcell E-1.
Date: April 20, 2018
Creator: unknown
Object Type: Photograph
System: The Gateway to Oklahoma History

E-1 (4-23-17)

Photograph of Lexington FD No. 1. 1965 Ford/Boardman fire truck. Truck details are on the front bottom right of the photo.
Date: April 23, 2017
Creator: unknown
Object Type: Photograph
System: The Gateway to Oklahoma History

E-1 (4-24-21)

Photograph of WFD E-1, a 2004 Freightliner/E-One pumper.
Date: April 24, 2021
Creator: unknown
Object Type: Photograph
System: The Gateway to Oklahoma History

1.5" & 1.25" light & heavy pressure relief valves, composition

Blueprint depicting technical details of Battleship Texas.
Date: April 22, 1914
Creator: unknown
Object Type: Technical Drawing
System: The Portal to Texas History

1.5" Angle Stop Check Valve for 250 Cu.Ft. Medium-Pressure Air Compressor

Blueprint depicting technical details of Battleship Texas.
Date: April 29, 1942
Creator: unknown
Object Type: Technical Drawing
System: The Portal to Texas History

1.5" heavy pressure valve

Blueprint depicting technical details of Battleship Texas.
Date: April 8, 1927
Creator: unknown
Object Type: Technical Drawing
System: The Portal to Texas History

1.5" Valves - Air - Oil Water Service for 250 Cu.Ft. Medium-Pressure Air Co

Blueprint depicting technical details of Battleship Texas.
Date: April 29, 1942
Creator: unknown
Object Type: Technical Drawing
System: The Portal to Texas History

1.5" Water & Air Valves for 250 Cu.Ft. Medium-Pressure Air Compressor

Blueprint depicting technical details of Battleship Texas.
Date: April 29, 1942
Creator: unknown
Object Type: Technical Drawing
System: The Portal to Texas History
A 1.8 K test facility for superconducting RF cavities (open access)

A 1.8 K test facility for superconducting RF cavities

To demonstrate the feasibility of superconducting RF technology for a high energy e{sup +}/e{sup {minus}} collider, a research and development program has begun with collaborators from Europe, Asia, and North America. The immediate goal of the R&D program is to build and operate a 50 meter-long linac at DESY with 1.3 GHz superconducting RF cavities at a temperature of 1.8 K - 2.0 K and an accelerating gradient of 15 MV/meter. The refrigeration for the test system at DESY initially will have a capacity of about 100 W at 1.8 K, distributed among three test cryostats. In a second step, refrigeration will be upgraded to 200 W at 1.8 K in order to supply the 50 meter test linac. This paper describes the cryogenics of this test system.
Date: April 1, 1994
Creator: Horlitz, G.; Knopf, U.; Lange, R.; Petersen, B.; Sellmann, D.; Trines, D. et al.
Object Type: Article
System: The UNT Digital Library
[$1.43 Million Grant Award for Public School Arts Education to UNT Group] (open access)

[$1.43 Million Grant Award for Public School Arts Education to UNT Group]

A detailed document capturing the significant achievement of a $1.43 million grant awarded to a UNT group for advancing public school arts education.
Date: April 17, 1996
Creator: unknown
Object Type: Text
System: The UNT Digital Library

E-1 1988 Mack (4-10-21)

Photograph of Grady County FD (Naples Station) E-1, a 1988 Mack/Marion pumper.
Date: April 10, 2021
Creator: unknown
Object Type: Photograph
System: The Gateway to Oklahoma History
E-1 CAM Revision 4 (open access)

E-1 CAM Revision 4

this report is a descriptive journey of the E-1 CAM Revision 4
Date: April 30, 1970
Creator: unknown
Object Type: Report
System: The UNT Digital Library

E-1 & E-2 (4-20-18)

Photograph of Purcell FD twin white E-One pumpers, E-1 and E-2, parked in front of PFD station 1. Photo and apparatus details on back.
Date: April 20, 2018
Creator: unknown
Object Type: Photograph
System: The Gateway to Oklahoma History
A 1-Joule laser for a 16-fiber injection system (open access)

A 1-Joule laser for a 16-fiber injection system

A 1-J laser was designed to launch light down 16, multi-mode fibers (400-{micro}m-core dia.). A diffractive-optic splitter was designed in collaboration with Digital Optics Corporation (DOC), and was delivered by DOC. Using this splitter, the energy injected into each fiber varied <1%. The spatial profile out of each fiber was such that there were no ''hot spots,'' a flyer could successfully be launched and a PETN pellet could be initiated. Preliminary designs of the system were driven by system efficiency where a pristine TEM{sub 00} laser beam would be required. The laser is a master oscillator, power amplifier (MOPA) consisting of a 4-mm-dia. Nd:YLF rod in the stable, q-switched oscillator and a 9.5-mm-dia. Nd:YLF rod in the double-passed amplifier. Using a TEM{sub 00} oscillator beam resulted in excellent transmission efficiencies through the fibers at lower energies but proved to be quite unreliable at higher energies, causing premature fiber damage, flyer plate rupture, stimulated Raman scattering (SRS), and stimulated Brillouin scattering (SBS). Upon further investigation, it was found that both temporal and spatial beam formatting of the laser were required to successfully initiate the PETN. Results from the single-mode experiments, including fiber damage, SRS and SBS losses, will be presented. In …
Date: April 6, 2004
Creator: Honig, J.
Object Type: Article
System: The UNT Digital Library