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Response of a recessed pressure transducer with a millisecond pressure step input

Description: All too often, dynamic pressure measurements are made with the sensitive part of the transducer, the diaphragm, recessed and away from the pressure source. If the transducer has been recessed far enough from the pressure source, an invalid pressure measurement will result. To explore the effect of recessing, the Reynolds pneumatic accelerator was used to produce a pressure step with a rise time from 0.5 to 2 ms. Results are presented. (auth)
Date: November 30, 1973
Creator: Shay, W. M. & Kuhlman, J.
Partner: UNT Libraries Government Documents Department

Some comments on manganin wire pressure gauges

Description: A standard manganin wire pressure gage was examined by comparing it with a recently developed 0.01% CaF/sub 2/ capacitive pressure gage. The effects of the Bridgman water kick'' and intrinsic time constant are clearly shown, and the results punctuate the usual assertion that manganin wire gages are extremely difficult to use approaching the 0.1% level. (auth)
Date: January 1, 1973
Creator: Andeen, C.; Schuele, D. & Fontanella, J.
Partner: UNT Libraries Government Documents Department

Method of inspecting dielectric materials at microwave frequencies

Description: A successful method of screening high-dielectric-constant, nonmagnetic, high-loss-factor materials at microwave frequencies was developed to provide material control by incoming inspection. This is accomplished by measuring the S parameters of the material---reliance on the manufacturer's permittivity data and x-ray examination for voids and inclusions is no longer necessary. Use of an automatic network analyzer makes 100% inspection economically feasible. (auth)
Date: November 1, 1973
Creator: O'Dell, G.D.
Partner: UNT Libraries Government Documents Department

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 used to measure temperature changes to plus or minus 0.22 K. The software and hardware necessary to completely automate the measurements are described. Measurements on National Bureau of Standards certified quartz, tungsten, and copper specimens demonstrated an accuracy of plus or minus 1.5% in determination of the coefficient of thermal expansion. (auth)
Date: January 1, 1973
Creator: Kollie, T.G.; McElroy, D.L.; Hutton, J.T. & Ewing, W.M.
Partner: UNT Libraries Government Documents Department

New transient surface-current sensor and recorder

Description: It was demonstrated that a transient surface-current pulse can be sensed and recorded by a graded-Hc film, a magnetic film with the coercive force Hc varying along the length of the film. Information on the magnitude of the current can be obtained by comparing the domain-wall location with the distribution of Hc value along the film. The transient characteristic of the current pulse can be deduced from the V-shaped configuration of the domain wall. (auth)
Date: October 19, 1973
Creator: Hsieh, E. J. & Vindelov, K. E.
Partner: UNT Libraries Government Documents Department


Description: This report is intended to serve as a user's manual for PICASSO. The detailed description of the concepts involved and the methods used in implementing those concepts will be treated in a subsequent paper and are incorporated in the Ph.D. thesis of one of the authors. The program evolved from earlier work on a graphics program for printed circuit board design which had a fixed library of elements. The need for a dynamic graphics program (i.e., one which allows the creation of new elements as required) soon became obvious, and the generality of such a program for mathematical modeling was a major factor in the development of PICASSO. It was thought that the present stage of development of this modeling program had reached a point that a report such as this would be useful in creating a broader interest in the field. However, work continues to further generalize the program into such areas as computer animation, 3-D display and modeling, and a more general interface to available ''analysis'' routines, such as the available compilers and interpreters. It should be emphasized that the program is continually changing as new ideas and applications arise. For example, in order to create a modeling system which is complete in some sense, PICASSO was designed explicitly to interface with the CDC analysis program MIMIC. The next step, already under investigation, is to allow for user-defined output templates to specify,the form of the output of a model. This feature, along with the capability for multiple definitions of an element, will allow for several types of analysis to be done on a single model. Another innovation being studied is the provision for ''robot'' commands, with which the user may define a sequence of. commands to be carried out on demand, in much the same way as mechanical ...
Date: January 1, 1972
Creator: Austin, D.M. & Holmes, H.H.
Partner: UNT Libraries Government Documents Department