207 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "Detection"  
Results: 1 - 24 next
open access

Investigations into the Early Life History of Naturally Spring Chinook Salmon in the Grande Ronde River Basin : Fish Research Project Oregon : Annual Progress Report Project Period 1 September 1997 to 31 August 1998.

Description: We determined migration timing and abundance of juvenile spring chinook salmon from three populations in the Grande Ronde River basin. We estimated 6,716 juvenile chinook salmon left upper rearing areas of the Grande Ronde River from July 1997 to June 1998; approximately 6% of the migrants left in summer, 29% in fall, 2% in winter, and 63% in spring. We estimated 8,763 juvenile chinook salmon left upper rearing areas of Catherine Creek from July 1997 to June 1998; approximately 12% of the migra… more
Date: January 1, 1998
Creator: Keefe, MaryLouise & Tranquilli, J. Vincent
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

D0 Central Tracking Solenoid Energization, Controls, Interlocks and Quench Protection Operating Procedures

Description: This procedure is used when it is necessary to operate the solenoid energization, controls, interlocks and quench detection system. Note that a separate procedure exists for operating the solenoid 'cryogenic' systems. Only D0 Control Room Operators or the Project Electrical Engineer are qualified to execute these procedures or operate the solenoid system. This procedure assumes that the operator is familiar with using the Distributed Manufacturing Automation and Control Software (DMACS).
Date: August 26, 1998
Creator: Hance, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

In-Situ Tritium Beta Detector

Description: The objectives of this three-phase project were to design, develop, and demonstrate a monitoring system capable of detecting and quantifying tritium in situ in ground and surface waters, and in water from effluent lines prior to discharge into public waterways. The tritium detection system design is based on measurement of the low energy beta radiation from the radioactive decay of tritium using a special form of scintillating optical fiber directly in contact with the water to be measured. The… more
Date: April 15, 1998
Creator: Berthold, J. W. & Jeffers, L. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Application of Polynomial and Radial Basis Function Maps to Signal Masking

Description: The objective of this research was to develop and demonstrate a technique for encrypting information by using a masking signal that closely approximates local ambient noise. Signal masking techniques developed to date have used nonlinear differential equations, spread spectrum, and various modulation schemes to encode information. While these techniques can effectively hide a signal, the resulting masks may not appear as ambient noise to an observer. The advantage of the proposed technique over… more
Date: January 1, 1998
Creator: Damiano, B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Fissible Deposit Characterization at the Former Oak Ridge K-25 Gaseous Diffusion Plant by {sup 252}CF-Source-Driven Measurements

Description: The Deposit Removal Project was undertaken with the support of the U. S. Department of Energy at the East Tennessee Technology Park (ETTP) formerly the Oak Ridge K-25 Site. The project team performed the safe removal of the hydrated uranyl fluoride (UO{sub 2}F{sub 2}) deposits from the K-29 Building of the former Oak Ridge Gaseous Diffusion Plant. The deposits had developed as a result of air leakage into UF{sub 6} gas process pipes; UO{sub 2}F{sub 2} became hydrated by moisture from the air an… more
Date: May 1, 1998
Creator: Hannon, T. F.; Mihalczo, J. T.; Mullens, J. A.; Uckan, T.; Valentine, T. E. & Wyatt, M. S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

SURFACE ACOUSTIC WAVE MERCURY VAPOR SENSOR

Description: Sensor Research and Development Corporation (SRD) has been contracted to develop and deliver a prototype instrument capable of the in situ detection and measurement of low levels of gaseous mercury for use in thermal treatment process control applications and continuous emissions monitoring. The goal is to develop a fast, simple, inexpensive and reliable in situ sensor instrument for detecting and monitoring vaporized mercury that should be able to react to extremely low (< 200 ppb) levels o… more
Date: June 2, 1998
Creator: Caron, Joshua
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Measurement of low levels of alpha in {sup 99}Mo product solutions.

Description: The conclusions of this report are that molybdenum can effectively be separated from uranium and plutonium using TRU-Resin; and that separation of the {sup 99}Mo from the actinides will reduce the analyst's exposure and simplify analysis for the actinide elements.
Date: March 5, 1998
Creator: Conner, C.; Liberatore, M. W.; Sedlet, J. & Vandegrift, G. F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Trace, isotopic analysis of micron-sized grains -- Mo, Zr analysis of stardust (SiC and graphite grains).

Description: Secondary Neutral Mass Spectrometry using resonant laser ionization can provide for both high useful yields and high discrimination while maintaining high lateral and depth resolutions. An example of the power of the method is measurement of the isotopic composition of Mo and Zr in 1-5 {micro}m presolar SiC and graphite grains isolated from the Murchison CM2 meteorite for the first time. These grains have survived the formation of the Solar System and isotopic analysis reveals a record of the s… more
Date: February 19, 1998
Creator: Pellin, M. J. & Nicolussi, G. K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

THE CONTROLLED DRIFT DETECTOR : CHARACTERISATION OF THE READOUT MECHANISM AND OF THE CHARGE HANDLING CAPABILITY.

Description: A new position-sensing X-ray detector operated in integrate-readout mode has been recently designed and characterized. Due to the peculiar working principle of the new detector, the charge handling capability, that is the maximum charge that can be stored in a pixel, is related to the operating conditions of the device. In particular the amplitude of the barriers that confine the signal electrons during the integration phase depends on the applied drift field and on the field perturbation super… more
Date: November 8, 1998
Creator: Castoldi, A.; Gatti, E.; Guazzoni, C.; Longoni, A.; Rehak, P. & Struder, L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Superdeformation in the A=150 and A=190 regions.

Description: Superdeformation has been established for over a decade in the mass 150 region and nearly as long in the A=190 region. The first measurements directed at nuclei in these regions concentrated on mapping out the superdeformed (SD) islands by identifying SD rotational bands in {gamma}-ray coincidence data. These early studies provided new insights into the physics of superdeformation, but also raised unexpected issues. The new gamma-ray arrays (Gammasphere, Eurogam/Euroball and Gasp) have provided… more
Date: December 1, 1998
Creator: Carpenter, M. P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Direct Fast-Neutron Detection: A Progress Report

Description: It is widely acknowledged that Mure neutron-detection technologies will need to offer increased performance at lower cost. One clear route toward these goals is rapid and direct detection of fast neutrons prior to moderation. This report describes progress to date in an effort to achieve such neutron detection via proton recoil within plastic scintillator. Since recording proton-recoil events is of little practical use without a means to discriminate effectively against gamma-ray interactions, … more
Date: October 18, 1998
Creator: Peurrung, AJ; Stromswold, DC; Reeder, PL & Hansen, RR
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

EPR detection of light-generated nuclear coherences in photosynthetic reaction centers.

Description: In this study we first discuss a pulsed EPR experiment designed to establish the mechanism of coherence generation [1]. The pulse sequence employed, flash-t-({pi}/2){sub x}-{tau}, consists of a short laser pulse at time zero, followed by a variable period t. At the end of this period a non-ideal ({pi}/2) microwave pulse is applied. The resulting free-induction decay at fixed detection time {tau} is then monitored as a function of successively incremented values of t. For P{sub 700}{sup +} A{sub… more
Date: May 4, 1998
Creator: Bechtold, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Physical protection upgrades in Ukraine.

Description: The U.S. DOE is providing nuclear material safeguards assistance in both material control and accountability and in physical protection to several facilities in Ukraine. This paper summarizes the types of physical protection upgrades that have been or are presently being implemented at these facilities. These facilities include the Kiev Institute for Nuclear Research, Kharkov Institute of Physics and Technology, Sevastopol Institute of Nuclear Energy and Industry, and the South Ukraine Nuclear … more
Date: August 6, 1998
Creator: Djakov, A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Laser scattering detection and characterization of defects and machining damage in silicon nitride components.

Description: It is known that surface and subsurface damage in machined silicon nitride (Si{sub 3}N{sub 4}) ceramic components can significantly affect component strength and lifetime. Because Si{sub 3}N{sub 4} may transmit some light into its subsurface, they have developed an elastic optical scattering technique to provide two-dimensional image data for detecting surface or subsurface defects and machining damage. This technique has been used to analyze diamond-ground Si{sub 3}N{sub 4} specimens subjected… more
Date: November 25, 1998
Creator: Sun, J. G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Fluid transfer concentration of airborne radioxenon to enhance monitoring capabilities.

Description: To facilitate airborne radioxenon monitoring, a xenon concentration method with potential advantages over current technology in simplicity, size, and cost has been developed. The concentration technique is based on the preferential absorption of heavy noble gases (krypton, xenon, and radon) by certain organic fluids. To implement this concentration technique, a radioxenon monitoring system requires three integrated sub-systems: (1) an absorption sub-system; (2) a degassing sub-system; and (3) a… more
Date: May 27, 1998
Creator: Russ, W. R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

On-loom, real-time, noncontact detection of fabric defects by ultrasonic imaging.

Description: A noncontact, on-loom ultrasonic inspection technique was developed for real-time 100% defect inspection of fabrics. A prototype was built and tested successfully on loom. The system is compact, rugged, low cost, requires minimal maintenance, is not sensitive to fabric color and vibration, and can easily be adapted to current loom configurations. Moreover, it can detect defects in both the pick and warp directions. The system is capable of determining the size, location, and orientation of each… more
Date: September 8, 1998
Creator: Chien, H. T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Geophysical tomography imaging system. Final CRADA report

Description: The Cooperative Research and Development Agreement (CRADA) between Lockheed Martin Energy Systems, Inc., and Geophex, Ltd., was established to investigate high-resolution, shallow acoustic imaging of the subsurface. The primary objectives of the CRADA were accomplished, including the evaluation of a new tomographic imaging algorithm and the testing and comparison of two different acoustic sources, the hammer/plate source and an electromagnetic vibratory source. The imaging system was composed e… more
Date: May 20, 1998
Creator: Norton, S. J. & Won, I. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Development of GaAs-Based Monolithic Surface Acoustic Wave Devices for Chemical Sensing and RF Filter Applications

Description: Since their invention in the mid-1960's, surface acoustic wave (SAW) devices have become popular for a wide variety of applications. SAW devices represent a low-cost and compact method of achieving a variety of electronic signal processing functions at high frequencies, such as RF filters for TV or mobile wireless communications [1]. SAW devices also provide a convenient platform in chemical sensing applications, achieving extremely high sensitivity to vapor phase analytes in part-per-billion c… more
Date: December 24, 1998
Creator: Baca, A. G.; Casalnuovo, S. A.; Drummond, T. J.; Frye, G. C.; Heller, E. J.; Hietala, V. M. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Corrections for the emission probabilities of the intense gamma rays from {sup 238}U and applying them to uranium isotopic analysis

Description: Gamma-ray emission probabilities of {sup 235}U and {sup 238}U have been studied extensively. While the gamma-ray emission probabilities for {sup 235}U and are well known, the emission probabilities for {sup 238}U differ widely from one study to another. This study indicates that one of the causes of the large discrepancies in the studies may be due to the true coincidence summing of many gamma rays from the decay of {sup 238}U daughters. The intensities of some of the intense gamma rays of {sup… more
Date: December 31, 1998
Creator: Vo, D. T.; Sampson, T. E. & Staples, P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A Three Dimensional Beam Profile Monitor Based on Residual Gas Ionization

Description: A three-dimensional beam profile monitor based on tracking the ionization of the residual gas molecules in the evacuated beam pipe is described. Tracking in position and time of the ions and electrons produced in the ionization enables simultaneous position sampling in three dimensions. Special features which make it possible to sample very low beam currents were employed.
Date: November 4, 1998
Creator: Lewis, T. A. & Shapira, D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Automated Detection and Location of Indications in Eddy Current Signals

Description: A computer implemented information extraction process that locates and identifies eddy current signal features in digital point-ordered signals, said signals representing data from inspection of test materials, by enhancing the signal features relative to signal noise, detecting features of the signals, verifying the location of the signal features that can be known in advance, and outputting information about the identity and location of all detected signal features.
Date: June 30, 1998
Creator: Brudnoy, David M.; Oppenlander, Jane E. & Levy, Arthur J.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
open access

Nonlinear processes in earthquakes

Description: This is the final report of a one-year, Laboratory Directed Research and Development (LDRD) project at Los Alamos National Laboratory (LANL). Three-dimensional, elastic-wave-propagation calculations were performed to define the effects of near-source geologic structure on the degree to which seismic signals produced by earthquakes resemble {open_quotes}non-double-couple{close_quotes} sources. Signals from sources embedded in a subducting slab showed significant phase and amplitude differences c… more
Date: December 31, 1998
Creator: Jones, Eric M. & Frohlich, Clifford
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Prediction of the TNT signature from buried UXO/landmines

Description: The detection and removal of buried unexploded ordnance (UXO) and landmines is one of the most important problems facing the world today. Numerous detection strategies are being developed, including infrared, electrical conductivity, ground-penetrating radar, and chemical sensors. Chemical sensors rely on the detection of TNT molecules, which are transported from buried UXO/landmines by advection and diffusion in the soil. As part of this effort, numerical models are being developed to predict … more
Date: June 1, 1998
Creator: Webb, Stephen W.; Phelan, James M.; Finsterle, Stefan A. & Pruess, Karsten
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

High-resolution subsurface imaging and neural network recognition: Non-intrusive buried substance location. Final report, January 26, 1997

Description: A high-frequency, high-resolution electromagnetic (EIVI) imaging system has been developed for environmental geophysics surveys. Some key features of this system include: (1) rapid surveying to allow dense spatial sampling over a large area, (2) high-accuracy measurements which are used to produce a high-resolution image of the subsurface, (3) measurements which have excellent signal-to-noise ratio over a wide bandwidth (31 kHz to 32 MHZ), (4) elimination of electric-field interference at high … more
Date: December 31, 1998
Creator: Sternberg, B. K. & Poulton, M. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen