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ac-resistance-measuring instrument

Description: An auto-ranging ac resistance measuring instrument for remote measurement of the resistance of an electrical device or circuit connected to the instrument includes a signal generator which generates an ac excitation signal for application to a load, including the device and the transmission line, a monitoring circuit which provides a digitally encoded signal representing the voltage across the load, and a microprocessor which operates under program control to provide an auto-ranging function by… more
Date: April 22, 1981
Creator: Hof, P. J.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
open access

S-20 photocathode research activity. Part I

Description: The goal of this activity has been to develop and implement S-20 photocathode processing techniques at Lawrence Livermore National Laboratory (LLNL) in order to study the physical properties of the photocathode films. The present work is the initial phase of a planned activity in understanding cathode fabrication techniques and the optical/electrical characterization of these films.
Date: November 22, 1983
Creator: Gex, F.; Huen, T. & Kalibjian, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Statistical analysis of fluorimeter operation

Description: Acceptance criteria for uranium check standards used to verify fluorimeter calibration have been developed. This work was done in response to Tiger Team finding QA/BMP-5, item 4. Data used as input to these calculations is retained in the Tiger Team closeout file, located in the Technical Service Division managers office. 3 refs., 4 tabs.
Date: January 22, 1991
Creator: Cutlip, L. B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Range of investigation of a borehole gravimeter

Description: Concepts of the range of investigation of a borehole gravimeter are reviewed. It is shown that the maximum sensitivity to a mass point at a horizontal distance R from a borehole occurs at a vertical distance Z = R/..sqrt..2. Thus, the angle of maximum sensitivity is about 55/sup 0/ from the vertical. It is also shown that the absolute value of the gravitational effect decreases with increasing R. There are two maxima of the vertical gradient of gravity (at Z = 0 and at Z = ..sqrt../sup 3///sub … more
Date: February 22, 1977
Creator: Hearst, J. R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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High spectral resolution measurements for the ARM Program

Description: This report focuses on the design and fabrication of high spectral resolution FTIR (Fourier Transform Infrared) instrumentation for the CART sites of the Atmospheric Radiation Measurement (ARM) Program. The ultimate objective of this grant is to develop three different types of instruments, named the AERI, AERI-X, and SORT. The Atmospheric Emitted Radiance Interferometer (AERI) is the simplest. It will be available for early deployment at the first ARM site and will be deployable at several loc… more
Date: May 22, 1992
Creator: Revercomb, H. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Unique microchannel plate process doubles MCPI resolution

Description: Applying a dielectric layer to the output of a microchannel plate (MCP) has allowed the screen voltage of a sealed microchannel-plate intensifier tube (MCPI) to be raised to over 10 kV, producing a field strength of 36 kV/mm without any detectable field emission or breakdown of the MCP/screen gap. Tube resolution exceeded 16 lp/mm at 50% modulation. Breakdown is higher in a dielectric than in a vacuum. In a concept being patented by Gary Power, a few-{mu}m-thick layer of a dielectric was sputte… more
Date: August 22, 1994
Creator: Thomas, S. & Power, G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Spallation Neutrons and Pressure – SNAP – DE-FG02-03ER46085 Close-Out May 2009

Description: The purpose of the grant was to build a community of scientist and to draw upon their expertise to design and build the world's first dedicated high pressure beamline at a spallation source - the so called Spallation Neutron And Pressure (SNAP) beamline at the Spallation Neutron Source (SNS) at OAk Ridge NAtional LAboratory. . Key to this endeavor was an annual meeting attended by the instrument design team and the executive committee. The discussions at those meeting set an ambitious agenda fo… more
Date: May 22, 2009
Creator: Parise, John B
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Novel Large Area High Resolution Neutron Detector for the Spallation Neutron Source

Description: Neutron scattering is a powerful technique that is critically important for materials science and structural biology applications. The knowledge gained from past developments has resulted in far-reaching advances in engineering, pharmaceutical and biotechnology industries, to name a few. New facilities for neutron generation at much higher flux, such as the SNS at Oak Ridge, TN, will greatly enhance the capabilities of neutron scattering, with benefits that extend to many fields and include, fo… more
Date: May 22, 2009
Creator: Lacy, Jeffrey L
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Critical Infrastructure for Ocean Research and Societal Needs in 2030

Description: The United States has jurisdiction over 3.4 million square miles of ocean—an expanse greater than the land area of all fifty states combined. This vast marine area offers researchers opportunities to investigate the ocean’s role in an integrated Earth system, but also presents challenges to society, including damaging tsunamis and hurricanes, industrial accidents, and outbreaks of waterborne diseases. The 2010 Gulf of Mexico Deepwater Horizon oil spill and 2011 Japanese earthquake and… more
Date: April 22, 2011
Creator: National Research Council
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

ULTRA-HIGH TEMPERATURE SENSORS BASED ON OPTICAL PROPERTY MODULATION AND VIBRATION-TOLERANT INTERFEROMETRY

Description: The goals of the first six months of this project were to begin laying the foundations for both the SiC front-end optical chip fabrication techniques for high pressure gas species sensing as well as the design, assembly, and test of a portable high pressure high temperature calibration test cell chamber for introducing gas species. This calibration cell will be used in the remaining months for proposed first stage high pressure high temperature gas species sensor experimentation and data proces… more
Date: July 22, 2005
Creator: Riza, Nabeel A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Workshop on Detectors for Synchrotron Radiation

Description: Forefront experiments in many scientific areas for which synchrotron sources provide sufficient flux are nonetheless hindered because detectors cannot collect data fast enough, do not cover sufficiently solid angle, or do no have adequate resolution. Overall, the synchrotron facilities, each of which represents collective investments from funding agencies and user institutions ranging from many hundreds of millions to more than a billion dollars, are effectively significantly underutilized. Whi… more
Date: November 22, 2000
Creator: Robinson, Arthur L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Experiences with remote electron microscopy

Description: With the advent of a rapidly proliferating international computer network, it became feasible to consider remote operation of instrumentation normally operated locally. For modern electron microscopes, the growing automation and computer control of many instrumental operations facilitated the task of providing remote operation. In order to provide use of NCEM TEMs by distant users, a project was instituted in 1995 to place a unique instrument, a Kratos EM-1500 operating at 1.5MeV, on-line for r… more
Date: February 22, 2002
Creator: O'Keefe, Michael A. & Parvin, Bahram
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

SIBYLS - A SAXS and protein crystallography beamline at the ALS

Description: The new Structurally Integrated BiologY for Life Sciences (SIBYLS) beamline at the Advanced Light Source will be dedicated to Macromolecular Crystallography (PX) and Small Angle X-ray Scattering (SAXS). SAXS will provide structural information of macromolecules in solutions and will complement high resolution PX studies on the same systems but in a crystalline state. The x-ray source is one of the 5 Tesla superbend dipoles recently installed at the ALS that allows for a hard x-ray program to be… more
Date: August 22, 2003
Creator: Trame, Christine; MacDowell, Alastair A.; Celestre, Richard S.; Padmore, Howard A.; Cambie, Daniella; Domning, Edward E. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Second order Pseudo-gaussian shaper

Description: The purpose of this document is to provide a calculus spreadsheet for the design of second-order pseudo-gaussian shapers. A very interesting reference is given by C.H. Mosher ''Pseudo-Gaussian Transfer Functions with Superlative Recovery'', IEEE TNS Volume 23, p. 226-228 (1976). Fred Goulding and Don Landis have studied the structure of those filters and their implementation and this document will outline the calculation leading to the relation between the coefficients of the filter. The genera… more
Date: November 22, 2002
Creator: Beche, Jean-Francois
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Aerial Image Microscopes for the Inspection of Defects in EUV Masks

Description: The high volume inspection equipment currently available to support development of EUV blanks is non-actinic. The same is anticipated for patterned EUV mask inspection. Once potential defects are identified and located by such non-actinic inspection techniques, it is essential to have instrumentation to perform detailed characterization, and if repairs are performed, re-evaluation. The ultimate metric for the acceptance or rejection of a mask due to a defect, is the wafer level impact. Thus mea… more
Date: October 22, 2002
Creator: Barty, A.; Taylor, J. S.; Hudyma, R.; Spiller, E.; Sweeney, D. W.; Shelden, G. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Modification of the x-ray diffraction efficiency of lithium fluoride crystals by surface treatment

Description: Convex-curved crystals of lithium fluoride demonstrate good dispersion and efficiency when used in reflection for x-ray spectral analysis. The crystals are stable and reasonably unaffected by harsh environments. In addition, they are mechanically strong, easily cleavable or machinable, and plastically deformable with heat. In the present study, flat crystal wafers were left either clear as cleaved or were subjected to surface treatment by sandblasting or lapping. Some wafers were then bent in a… more
Date: July 22, 1976
Creator: Sellick, Barton O.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

High Bandwidth Short Stroke Rotary Fast Tool Servo

Description: This paper presents the design and performance of a new rotary fast tool servo (FTS) capable of developing the 40 g's tool tip acceleration required to follow a 5 micron PV sinusoidal surface at 2 kHz with a planned accuracy of 50 nm, and having a full stroke of 50 micron PV at lower frequencies. Tests with de-rated power supplies have demonstrated a closed-loop unity-gain bandwidth of 2 kHz with 20 g's tool acceleration, and we expect to achieve 40 g's with supplies providing {+-} 16 Amp to th… more
Date: August 22, 2003
Creator: Montesanti, R C & Trumper, D L
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A pressurized thermogravimetric analyzer for use in studies of gas/solid systems. First technical report

Description: A TG-151 Thermogravimetric Experimental Station, which measures and records weight changes of a solid material over a wide dynamic temperature range at a wide range of pressures in controlled environments, was purchased from Cahn Instruments, Inc. The TG-151 permits temperature to be programmed to follow a precise temperature profile of ramp and/or isothermal segments while monitoring the changes in weight of solid samples exposed to a gaseous environment of specified composition at a preset pr… more
Date: September 22, 1993
Creator: Mitchell, R. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Regenerable activated bauxite adsorbent alkali monitor probe

Description: This invention relates to a regenerable activated bauxite adsorber alkali monitor probe for field applications to provide reliable measurement of alkali-vapor 5 concentration in combustion gas with special emphasis on pressurized fluidized-bed combustion (PFBC) off-gas. More particularly, the invention relates to the development of a easily regenerable bauxite adsorbent for use in a method to accurately determine the alkali-vapor content of PFBC 10 exhaust gases.
Date: January 22, 1991
Creator: Lee, S. H. D.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
open access

High spectral resolution measurements for the ARM Program. Year two technical progress report, March 15, 1991--March 15, 1992

Description: This report focuses on the design and fabrication of high spectral resolution FTIR (Fourier Transform Infrared) instrumentation for the CART sites of the Atmospheric Radiation Measurement (ARM) Program. The ultimate objective of this grant is to develop three different types of instruments, named the AERI, AERI-X, and SORT. The Atmospheric Emitted Radiance Interferometer (AERI) is the simplest. It will be available for early deployment at the first ARM site and will be deployable at several loc… more
Date: May 22, 1992
Creator: Revercomb, H. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Triggerable Continuum Source for Single-shot Ultra-fast Applications

Description: We demonstrate a triggerable continuum source based on a modulated DFB laser. Such a source eliminates the need to synchronize a mode-locked-laser with an incoming signal in applications such as spectroscopy and wideband signal processing.
Date: March 22, 2006
Creator: Chou, J.; Bennett, C V; Boyraz, O & Jalali, B
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Design of Low-Noise Output Amplifiers for P-channel Charge-Coupled Devices Fabricated on High-Resistivity Silicon

Description: We describe the design and optimization of low-noise, single-stage output amplifiers for p-channel charge-coupled devices (CCDs) used for scientific applications in astronomy and other fields. The CCDs are fabricated on high-resistivity, 4000–5000 -cm, n-type silicon substrates. Single-stage amplifiers with different output structure designs and technologies have been characterized. The standard output amplifier is designed with an n{sup +} polysilicon gate that has a metal connection to the se… more
Date: December 22, 2011
Creator: Haque, S.; Frost, F.; Groulx, R.; Holland, S. E.; Karcher, A.; Kolbe, W. F. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Integration and Evaluation of a Position Sensor with Continuous Read-Out for use with the Environmental Measurement-While-Drilling Gamma Ray Spectrometer System

Description: The Environmental Measurement-While-Drilling-Gamma Ray Spectrometer (EMWD-GRS) system represents an innovative blend of new and existing technology that provides real-time environmental and drill bit data during drilling operations. The EMWD-GRS technology was demonstrated at Savannah River Site (SRS) F-Area Retention Basin. The EMWD-GRS technology demonstration consisted of continuously monitoring for gamma-radiation-producing contamination while drilling two horizontal boreholes below the bac… more
Date: February 22, 1999
Creator: Lockwood, G. J.; Normann, R. A.; Selph, M. M. & Williams, C. V.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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