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in subjects: "Equipment 440300* -- Miscellaneous Instruments-- -1989"

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DART II documentation. Volume III. Appendices

The DART II is a data acquisition system that can be used with air pollution monitoring equipment. This volume contains appendices that deal with the following topics: adjustment and calibration procedures (power supply adjustment procedure, ADC calibration procedure, analog multiplexer calibration procedure); mother board signature list; schematic diagrams; device specification sheets (microprocessor, asynchronous receiver/transmitter, analog-to-digital converter, arithmetic processing unit, 5… more

Date: May 23, 1979

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Ziptrack manual

A phenolic cart holding 3 mutually perpendicular search coils is moved through an luminum beam into the magnetic field. Coil voltages re integrated and digitized through a Data Translation 1712 ADC. The cart is controlled and the data is processed by an on-line PDP-11/05 computer. The results are displayed on a Tektronix 4010 terminal, stored on 9 track, 800 bpi tapes, and optionally recorded on a hard copy. Software on a floppy disk controls the system. The position of the cart is located by a… more

Date: July 1, 1983

Creator: Ito, A.; Bosworth, W.; Rutherford, J.; Lynch, A.; Tung, L. & Yang, W.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Optical trapping, cell manipulation and robotics

A new type of analytical and preparative cytometric instrument was developed. The instrument combines image analysis and machine vision with single cell and chromosome manipulation by means of optical trapping. A proof-of-principle instrument, OCAM, has the ability to locate and analyze biological particles inside an enclosed manipulation chamber, as well as the ability to move and position particles according to preprogrammed protocols. Preliminary results and potential biological applications… more

Date: January 1, 1989

Creator: Buican, Tudor N.; Neagley, Dan L.; Morrison, William C. & Upham, Bryan D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Sandia Mark II X-Ray System

The Sandia Mark II X-Ray System was designed and developed to provide an intense source of mononergetic, ultra-soft x rays with energies between 0.282 and 1.486 keV. The x-ray tube design is similar to one developed by B.L. Henke and incorporates modifications made by Tom Ellsberry. An operations manual section is incorporated to help the experimenter/operator.

Date: November 1, 1979

Creator: Morrison, Lenor W.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Measurement and characterization of x-ray spot size

In planning an x-ray imaging experiment one must have an accurate model of the imaging system to obtain optimum results. The blurring caused by the finite size of the x-ray source is often the least understood element in the system. We have developed experimental and analytical methods permitting accurate measurement and modeling of the x-ray source. The model offers a simple and accurate way to optimize the radiographic geometry for any given experimental requirement (i.e., resolution and dose… more

Date: January 1, 1989

Creator: Mueller, K. H.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Head assembly for multiposition borehole extensometer

A head assembly for a borehole extensometer and an improved extensometer for measuring subsurface subsidence. A plurality of inflatable anchors provide discrete measurement points. A metering rod is fixed to each of the anchors which are displaced when subsidence occurs, thereby translating the attached rod. The head assembly includes a sprocket wheel rotatably mounted on a standpipe and engaged by a chain which is connected at one end to the metering rod and at the other end to a counterweight… more

Date: June 9, 1981

Creator: Frank, D.N.

Item Type: Patent

Partner: UNT Libraries Government Documents Department

open access

High spatial resolution in x-ray fluorescence

The design of diffracting crystals for use in x-ray fluorescence spectrometers is discussed. Characteristics of the Johan and Johansson geometries are discussed and intensity profiles are developed. If the diffraction line has a finite width, concentration gradients will not be faithfully reproduced by gradients in the signal as the sample is scanned. Boundary effects for four types of concentration gradient are presented; as step function, linear gradients, exponential gradient, and Gaussian g… more

Date: January 1, 1986

Creator: Zahrt, J. D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Development of a dynamic radiographic capability using high-speed video

High-speed video equipment can be used to optically image up to 2000 full frames per second or 12,000 partial frames per second. X-ray image intensifiers have historically been used to image radiographic images at 30 frames per second. By combining these two types of equipment, it is possible to perform dynamic x-ray imaging of up to 2,000 full frames per second. The technique has been demonstrated using conventional, industrial x-ray sources such as 150 kV and 300 kV constant potential x-ray g… more

Date: January 1, 1984

Creator: Bryant, L.E. Jr.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

CCD (charge-coupled device) sensors in synchrotron x-ray detectors

The intense photon flux from advanced synchrotron light sources, such as the 7-GeV synchrotron being designed at Argonne, require integrating-type detectors. Charge-coupled devices (CCDs) are well suited as synchrotron x-ray detectors. When irradiated indirectly via a phosphor followed by reducing optics, diffraction patterns of 100 cm/sup 2/ can be imaged on a 2 cm/sup 2/ CCD. With a conversion efficiency of approx.1 CCD electron/x-ray photon, a peak saturation capacity of >10/sup 6/ x rays ca… more

Date: January 1, 1987

Creator: Strauss, M. G.; Naday, I.; Sherman, I. S.; Kraimer, M. R.; Westbrook, E. M. & Zaluzec, N. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Use of multielement detector systems with synchrotron x-ray sources

The extremely high intensity and pulsed structure of synchrotron radiation x-ray sources put very demanding requirements on associated x-ray detectors. In current detector systems, trade-offs must be made between the efficiency, energy resolution, counting rate capability and the spatial resolution. Two detector systems are described which illustrate the optimization of these parameters for different applications of synchrotron radiation. One system is a segmented 16 channel multiwire proportio… more

Date: July 1, 1981

Creator: Thompson, A. C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Focusing and imaging sharp line x-ray and gamma-ray sources using variable-metric diffraction crystals. [Gamma ray telescopes]

A new method has been devised for focusing and imaging the radiation from sharp-line sources of x-rays and gamma-rays, which makes use of variable-metric diffraction crystals. A variable-metric diffraction crystal is one in which the spacings between the crystalline planes is varied as a function of position in the crystal by either the application of a thermal gradient or by changing the composition of a two component or multiple component crystal. This change in planar spacing changes the Bra… more

Date: January 1, 1982

Creator: Smither, R.K.

Item Type: Article

Partner: UNT Libraries Government Documents Department