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Effect of a bridge balance network on a semiconductor pressure transducer

Description: Pressure transducers and accelerometers that make use of semiconductors strain gages or have strain gages diffused on a silicon diaphragm cannot be used with a bridge balance network if one wants to achieve thermal zero compensation. Thermal zero compensation is compensating for the change in output due to temperature only, and is typically +-1.5 percent of the full scale output for a temperature change of 100/sup 0/F. The reason for not using a balance network is the way in which the transduce… more
Date: April 23, 1973
Creator: Shay, W. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Computer-operated quartz differential dilatometer

Description: From international symposium on thermal expansion of solids; Lake of the Czarks, Missouri, USA (7 Nov 1973). A quartz differential dilatometer was interfaced with a Digital Equipment Corporation PDP-8 computer to automatically measure the thermal expansion of solids from 300 to 1000 K. A Carson-Dice Electronic-Mechanicai Micrometer, readable to 2.5 x 10/sup -6/ cm, was employed for length-change measurements accurate to 2.5 x 10/sup -5/ cm. Calibrated Pt/Pt/ sub 90/Rh/sub 10/ thermocouples were… more
Date: January 1, 1973
Creator: Kollie, T. G.; McElroy, D. L.; Hutton, J. T. & Ewing, W. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Method for increased accuracy in Eulerian fluid dynamics calculations

Description: A method for increased accuracy in Eulerian fluid dynamics calculations is described. The essence of the method is local cancellation of low-order, diffusional truncation errors. These errors are the source of nonlinear numerical instabilities. The methodology is described in general and specific application is made to the transient, two-dimensional flow equations for chemically reacting mixtures. Two example problems are solved to illustrate the method. For comparison, the same problems are so… more
Date: October 1, 1973
Creator: Rivard, W. C.; Farmer, O. A.; Butler, T. D. & O'Rourke, P. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Determination of trace quantities of thorium in uranyl nitrate by x-ray emission spectrometry

Description: Trace quantities of thorium in uranium were separated by precipitating thorium fluoride from a 1.0M HF-1.0M NH/sub 4/F matrix using yttrium as an internal standard and lanthanum as a carrier. The thorium precipitate was collected on a filter and analyzed by x-ray emission spectrometry. The method has a detection limit of about 15 mu g thorium per gram of uranium. The relative accuracy and precision at the 120- mu g thorium level was 95.5 plus or minus 1.5%. Studies on the rate of precipitation,… more
Date: October 1, 1973
Creator: Winters, W.I.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Sulfur isotope relative ratios determined by mass spectrometry

Description: BS>The ratio of the sulfur isotope ratio, /sup 34/S/(/sup 32/S + /sup 32/ S), in a sample of sulfur hexafluoride to that in an isotopically different sample (relative ratio) is determined to plus or minus 0.00003 (standard deviation) at relative ratios of 1.003-1.007 and near-natural isotopic abundances. (auth)
Date: December 1, 1973
Creator: Howard, O.H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Understanding resonance self-shielding effects with the help of a simplified cross-section model

Description: Recent TART Monte Carlo calculations have shown discrepancies with F number measurements, as well as with measurements of fission density in /sup 235/ U and /sup 239/PU plates. These discrepancies have been attributed to the fact that the group-averaged TART cross sections cannot properly treat resorance self- shielding effects, because the width of TART groups is large compared with the width of cross-section resonances. This report attempts to explain the observed discrepancies with the help … more
Date: November 13, 1973
Creator: Kruger, H. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Fission-product afterheat: a review of experiments pertinent to the thermal-neutron fission of $sup 235$U

Description: Experimental data relating to beta and gamma energy release rates following thermal-neutron fission of /sup 235/U are reviewed. An afterheat function based on these experiments, for after-shutdown times from 1 s to 5 x 10/ sup 5/ s, is proposed and compared with the proposed ANS Standard ANS-5.1; and the uncertainty in the function proposed here is estimated. This proposed function varies between 0.98 and 1.08 times the proposed standard function; the standard deviation is estimated to be betwe… more
Date: October 1, 1973
Creator: Perry, A. M.; Maienschein, F. C. & Vondy, D. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Improved radio-frequency power standards

Description: Two types of Hewlett Packard radio-frequency power meters were modified to improve the accuracy of their calibration-factor-compensation circuits from 1 to 0.1%. The modification resulted in a continuously variable calibration-factor dial with a resolution of 0.01% and a 0.5% improvement in the confidence level of power measurements. (auth)
Date: September 1, 1973
Creator: Stone, D.W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Differential spectrophotometric determination of plutonium using the Cary Model 16 spectrophotometer

Description: ABS>The application of a high-precision Cary Model 16 spectrophotometer to the differential spectrophotometric determination of plutonium(III) was investigated. The absorbances of plutonium(III) solutions were measured against colored glass filters at 560 nanometers. Selection of various instrument parameters and the determination of the best reference filter for the highest precision are discussed. Two sets of calibration points were analyzed, The absorbance for each set was measured once a da… more
Date: August 1, 1973
Creator: Winters, W.I.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Method of improving analog comparator calibration accuracy

Description: Product performance specifications often require monitoring of signal lines for minimum and maximum dc levels and pulse amnplitudes. Monitoring is usually done on a Go/No-Go basis since a recorded value is not required. This type of signal monitoring can be done with an analog-type voltage comparator. The integrated circuit analog voltage comparator is widely used in this application since it is both accurate and economical. The accuracy of the voltage comparator will depend on the accuracy of … more
Date: November 1, 1973
Creator: Doussard, J.R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Determination of trace noble gases in air and natural gas

Description: From symposium on noble gases; Las Vegas, Nevada, USA (24 Sep 1973). A method was developed for the analysis of air and natural gas samples containing trace amounts of noble gases. The gas samples are preconcentrated by reaction with calcium at 900 to 1000 deg C and analyzed by mass spectrometry on an automated instrument. Methods of relating the concentrated sample to the original sample and the preparation of gas standards are given. The accuracy of the technique at the 25 ppM level was deter… more
Date: September 1, 1973
Creator: Newton, John C.; Stephens, Fred B. & Stump, Ronald K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Magnetic field of the 30-inch hydrogen bubble chamber at NAL: report on results of fringe-field measurements and central-field measurements

Description: During the period from December 19, 1972 to January 7, 1973 an extensive program of measurements of the fringe field of the 30-inch HBC magnet at NAL was carried out. Measurements of two components of the field were made at approximately 1900 points in the fringe field down-stream from the bubble chamber at each of two magnet currents (nominal currents were 18,000 and 16,000 amps). An additional 800 measurements were made to determine the effects on the field of iron phototube shields used with… more
Date: July 1, 1973
Creator: Shephard, W.D.; Bishop, J.M.; Fokitis, E. & U., /Notre Dame
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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