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Water levels in continuously monitored wells in the Yucca Mountain area, Nevada, 1985--88

Description: Water levels have been monitored hourly in 15 wells completed in 23 depth intervals in the Yucca Mountain area, Nevada. Water levels were monitored using pressure transducers and were recorded by data loggers. The pressure transducers were periodically calibrated by raising and lowering them in the wells. The water levels were normally measured at approximately the same time that the transducers were calibrated. Where the transducer output appeared reasonable, it was converted to water levels u… more
Date: July 1, 1993
Creator: Luckey, Richard R.; Lobmeyer, David H. & Burkhardt, Douglas J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A new mechanical characterization method for thin film microactuators and its application to NiTiCi shape memory alloy

Description: In an effort to develop a more full characterization tool of shape memory alloys, a new technique is presented for the mechanical characterization of microactuators and applied to SMA thin films. A test instrument was designed to utilize a spring-loaded transducer in measuring displacements with resolution of 1.5 pm and forces with resolution of 0.2 mN. Employing an out-of-plane loading method for freestanding SMA thin films, strain resolution of 30{mu}{epsilon} and stress resolution of 2.5 MPa… more
Date: June 1, 1999
Creator: Seward, K P
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
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An overview of film-based microsensors and applications

Description: Many chemical analysis problems exist that encourage the development of small, low-cost, low power, chemical sensors in many of these applications, while speciation of the sample is unnecessary due to prior knowledge of the sample constituents, it is necessary to monitor, in near real-time, the concentration of a Particular species of interest, An example of this of problem would be the monitoring of a chemical process such as steam reforming of chemical waste or ground water monitoring where p… more
Date: December 31, 1995
Creator: Pfeifer, K. B.; Butler, M. A. & Hughes, R. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Two-Phase Mass Flow Measurement Using Noise Analysis

Description: The purpose of this work is to develop a low cost, non-intrusive, mass flow measurement sensor for two-phase flow conditions in geothermal applications. The emphasis of the work to date has been on a device that will monitor two-phase flow in the above-ground piping systems. The flashing brines have the potential for excessive scaling and corrosion of exposed surfaces, which can reduce the effectiveness of any measurement device. A major objective in the work has been the development of an inst… more
Date: May 1, 1999
Creator: Blotter, J.; Stephens, A. G.; Keller, J. G. & Evans, R. P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Chemical class specificity using self-assembled monolayers on SAW devices

Description: We have studied the chemical selectivity and sensitivity of surface acoustic wave (SAW) sensors covered by (COO{sup {minus}}){sub 2}/Cu{sup 2+}-terminated interfaces by examining the response of self-assembled monolayer (SAM) films formed from the solution phase for 36, 84, and 180 h adsorption times. These organomercaptan SAMs were prepared on thin-film Au surfaces having variable, controlled grain size. The SAW response from the carboxylate coordinated Cu{sup 2+}-terminated SAM is compared to… more
Date: June 1, 1996
Creator: Thomas, R. C.; Ricco, A. J.; Yang, H. C.; Dermody, D. & Crooks, R. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Low-jitter sonoluminescence cell

Description: This report constitutes the final report for subcontract B338667. The statement of work for this subcontract was divided into three tasks: Task 1: Produce and quantify the stability of a sonoluminescence cell. The quantification will entail measuring the variation of the amplitude of the light flashes, here called events, and the variation in the time between the individual events i.e., the jitter. On a best effort basis we desire the light amplitude to be stable within 20 So and the jitter bet… more
Date: January 1, 1998
Creator: Lee, R. W., LLNL
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Ultrasonic Sensor and Method of use

Description: An ultrasonic sensor system and method of use for measuring transit time through a liquid sample, comprising at least one ultrasonic transducer coupled to a precision time interval counter. The timing circuit captures changes in transit time, representing small changes in the velocity of sound transmitted, over necessarily small time intervals (nanoseconds) and uses the transit time changes to identify the presence of non-conforming constituents in the sample.
Date: July 22, 1999
Creator: Condreva, Kenneth J.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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Computerized Ultrasound Risk Evaluation (CURE) System: Development of Combined Transmission and Reflection Ultrasound with New Reconstruction Algorithms for Breast Imaging

Description: Our Computerized Ultrasound Risk Evaluation (CURE) system has been developed to the engineering prototype stage and generated unique data sets of both transmission and reflection ultrasound (US). This paper will help define the clinical underpinnings of the developmental process and interpret the imaging results from a similar perspective. The CURE project was designed to incorporate numerous diagnostic parameters to improve upon two major areas of early breast cancer detection. CURE may provid… more
Date: September 7, 2001
Creator: Littrup, Peter J.; Duric, Neb; Azevedo, Stephen; Chambers, David; Candy, James V.; Johnson, Stephen et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Concepts for General-Purpose Under Sodium Scanning Systems

Description: The development of the concepts for general-purpose scanning systems is discussed, based on the consideration of ultrasonics operating in liquid sodium. Technical information and data, such as ultrasonic attenuation in liquid sodium, piezoelectric materials operating in 600 F sodium, ect., are provided from theoretical and experimental studies. The report also includes explanations, analyses, and applications of the single-narrow-beam scanning systems and the electronic acoustic image conversio… more
Date: November 8, 1965
Creator: Ying, Shuh-Pan & Scott, Clyde C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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