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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

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
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
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
1+ -n+ ECR Ion Source Development Test Stand (open access)

1+ -n+ ECR Ion Source Development Test Stand

A test stand for the investigation of 1+-n+ charge boosting using an ECR ion sources is currently being assembled at the Texas A&M Cyclotron Institute. The ultimate goal is to relate the charge-boosting of ions of stable species to possible charge-boosting of ions of radioactive species extracted from the diverse, low-charge-state ion sources developed for radioactive ion beams.
Date: April 7, 2006
Creator: May, Donald P.
Object Type: Report
System: The UNT Digital Library

2.5" & 3.5" heavy pressure relief valve

Blueprint depicting technical details of Battleship Texas.
Date: April 23, 1914
Creator: unknown
Object Type: Technical Drawing
System: The Portal to Texas History
2\beta + \gamma from B^0 to D^\mp K^0 \pi^\pm Decays at BaBar: aSimulation Study (open access)

2\beta + \gamma from B^0 to D^\mp K^0 \pi^\pm Decays at BaBar: aSimulation Study

The authors present the results of a simulation study to perform the extraction of 2{beta} + {gamma} from B{sup 0} {yields} D{sup {-+}}K{sup 0}{pi}{sup {+-}} decays through a time-dependent Dalitz analysis of BaBar data.
Date: April 16, 2007
Creator: Polci, Francesco; Schune, Marie-Helene; Stocchi, Achille & /Orsay, LAL
Object Type: Article
System: The UNT Digital Library
2-D and 3-D Elastic Modeling with Shared Seismic Models (open access)

2-D and 3-D Elastic Modeling with Shared Seismic Models

Several elastic models, both 2-D and 3-D, are being built for use in calculating synthetic elastic seismic data. The models will be made available to the research community, along with the synthetic data that are being calculated from them. These shared models have been proposed or contributed by participants in a collaborative industry, national laboratory, and university research project. The purpose of the modeling is to provide synthetic data to better understand elastic wave propagation and the effects of structural and stratigraphic complexities. The 2-D models are easier to design and change and synthetic calculations can be run relatively quickly in them. It will be possible to alter their layer properties and calculate time-lapse data sets from them. Field data will be available to accompany many of the 2-D models. 3-D models are more realistic, but more difficult to design and change. They also require considerably more computing resources to calculate synthetic data from them. A new 3-D model is being designed, and will be used for computing synthetic elastic data.
Date: April 30, 2002
Creator: House, L.; Marfurt, K. J.; Larsen, S. & Martin, G. S.
Object Type: Article
System: The UNT Digital Library

2" HP valve with locking device for whistle & siren

Blueprint depicting technical details of Battleship Texas.
Date: April 29, 1914
Creator: unknown
Object Type: Technical Drawing
System: The Portal to Texas History

2" Standard High Lift Sea Valve Boiler Blows Pressure 101 - 300 Lbs. [Boiler Room]

Blueprint depicting technical details of Battleship Texas.
Date: April 2, 1927
Creator: unknown
Object Type: Technical Drawing
System: The Portal to Texas History

3.5" heavy pressure valve

Blueprint depicting technical details of Battleship Texas.
Date: April 30, 1912
Creator: unknown
Object Type: Technical Drawing
System: The Portal to Texas History
A 3-Axis Force Balanced Accelerometer Using a Single Proof-Mass (open access)

A 3-Axis Force Balanced Accelerometer Using a Single Proof-Mass

This paper presents a new method for wideband force balancing a proof-mass in multiple axes simultaneously. Capacitive position sense and force feedback are accomplished using the same air-gap capacitors through time multiplexing. Proof of concept is experimentally demonstrated with a single-mass monolithic surface micromachined 3-axis accelerometer.
Date: April 1997
Creator: Lemkin, M.A.; Boser, B.E.; Auslander, D. & Smith, J.
Object Type: Article
System: The UNT Digital Library