Preliminary design of a cryogenic thermoelectric generator.

Preliminary design of a cryogenic thermoelectric generator.

Date: May 2007
Creator: Sivapurapu, Sai Vinay Kumar
Description: A cryogenic thermoelectric generator is proposed to increase the efficiency of a vehicle propulsion system that uses liquid nitrogen as its fuel. The proposed design captures some of the heat required for vaporizing or initial heating of the liquid nitrogen to produce electricity. The thermoelectric generator uses pressurized liquid nitrogen as its cold reservoir and ambient air as the high-temperature reservoir to generate power. This study concentrated on the selection of thermoelectric materials whose properties would result in the highest efficiency over the operating temperature range and on estimating the initial size of the generator. The preliminary selection of materials is based upon their figure of merit at the operating temperatures. The results of this preliminary design investigation of the cryogenic thermoelectric generator indicate that sufficient additional energy can be used to increase overall efficiency of the thermodynamic cycle of a vehicle propulsion system.
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Feminist Design Methodology: Considering the Case of Maria Kipp

Feminist Design Methodology: Considering the Case of Maria Kipp

Date: December 2003
Creator: Lawrence, Anne
Description: This thesis uses the work and career of the textile designer Maria Kipp to stage a prolegomena concerning how to write about a female designer active during the middle of the twentieth century. How can design historians incorporate new methodologies in the writing of design history? This thesis explores the current literature of feminist design history for solutions to the potential problems of the traditional biography and applies these to the work and career of Kipp. It generates questions concerning the application of methodologies, specifically looking at a biographical methodology and new methodologies proposed by feminist design historians. Feminist writers encourage scholarship on unknown designers, while also they call for a different kind of writing and methodology. The goal of this thesis is to examine how these new histories are written and in what ways they might inspire the writing of Kipp into design history.
Contributing Partner: UNT Libraries
Approach to developing a ground-motion design basis for facilities important to safety at Yucca Mountain

Approach to developing a ground-motion design basis for facilities important to safety at Yucca Mountain

Date: April 1, 1990
Creator: King, J.L.
Description: The Department of Energy has proposed a methodology for developing a ground-motion design basis for prospective facilities at Yucca Mountain that are important to safety. The methodology utilizes a quasi-deterministic construct that is designed to provide a conservative, robust, and reproducible estimate of ground motion that has a one-in-ten chance of occurring during the preclosure period. This estimate is intended to define a ground-motion level for which the seismic design would ensure minimal disruption to operations; engineering analyses to ensure safe performance in the unlikely event that the design basis is exceeded are a part of the proposed methodology. 8 refs.
Contributing Partner: UNT Libraries Government Documents Department
Electrostatic comb drive for vertical actuation

Electrostatic comb drive for vertical actuation

Date: July 10, 1997
Creator: Lee, A. P., LLNL
Description: The electrostatic comb finger drive has become an integral design for microsensor and microactuator applications. This paper reports on utilizing the levitation effect of comb fingers to design vertical-to-the-substrate actuation for interferometric applications. For typical polysilicon comb drives with 2 {micro}m gaps between the stationary and moving fingers, as well as between the microstructures and the substrate, the equilibrium position is nominally 1-2 {micro}m above the stationary comb fingers. This distance is ideal for many phase shifting interferometric applications. Theoretical calculations of the vertical actuation characteristics are compared with the experimental results, and a general design guideline is derived from these results. The suspension flexure stiffnesses, gravity forces, squeeze film damping, and comb finger thicknesses are parameters investigated which affect the displacement curve of the vertical microactuator. By designing a parallel plate capacitor between the suspended mass and the substrate, in situ position sensing can be used to control the vertical movement, providing a total feedback-controlled system. Fundamentals of various capacitive position sensing techniques are discussed. Experimental verification is carried out by a Zygo distance measurement interferometer.
Contributing Partner: UNT Libraries Government Documents Department
A waste package strategy for regulatory compliance

A waste package strategy for regulatory compliance

Date: April 1, 1990
Creator: Stahl, D. & Cloninger, M.O.
Description: This paper summarizes the strategy given in the Site Characterization Plan for demonstrating compliance with the post closure performance objectives for the waste package and the Engineered Barrier System contained in the Code of Federal Regulations. The strategy consists of the development of a conservative waste package design that will meet the regulatory requirements with sufficient margin for uncertainty using a multi-barrier approach that takes advantage of the unsaturated nature of the Yucca Mountain site. 7 refs., 1 fig.
Contributing Partner: UNT Libraries Government Documents Department
Resonance Control Cooling System for the APT/LEDA RFQ

Resonance Control Cooling System for the APT/LEDA RFQ

Date: November 4, 1998
Creator: Domer, G.A. & Floersch, R.H.
Description: The Radio Frequency Quadrupole (RFQ) resonance control cooling system (RCCS) for the Low Energy Demonstration Accelerator (LEDA) in support of the Accelerator Production of Tritium (APT) is described. Constant flow regulating valves to distribute the required flow to the 424 channels and to permit use of centrifugal pumps is discussed. Control system schema are described to regulate resonance frequency during steady state operation.
Contributing Partner: UNT Libraries Government Documents Department
X-Ray Shawdowgraph Camera Design

X-Ray Shawdowgraph Camera Design

Date: January 1, 1999
Creator: McCrea, Edward J.; Doman, Michael J. & Rohde, Randy A.
Description: An imagining camera that is used with X-Ray radiography systems in high explosive experiments has been built and fielded. The camera uses a 40mm diameter Micro-Channel Plate Itensifier (MCPI) for optical gain and photographic film for image recording. In the normal location of the X-ray film pack, a scintillating screen is placed instead. The camera system views the screen and records the image. The sensitivity of the MCPI to light makes the camera design sensitive to small details that a film pack does not need to consider. The X-ray image recording system was designed and bulit for situations where the film pack of the X-ray shadowgraph is not retrievable after the experiment. The system has been used in a number of experiments.
Contributing Partner: UNT Libraries Government Documents Department
Ohio Coal Testing and Development Facility - Construction and operation. Final report

Ohio Coal Testing and Development Facility - Construction and operation. Final report

Date: March 1, 1996
Creator: Ferris, D.D.
Description: On June 14, 1987, the Ohio Coal Development Office (OCDO) executed a grant agreement with ICF Kaiser Engineers (ICF Kaiser) for the planning and design (Phase I) of a Demonstration Advanced Technology Coal Preparation Facility. Subsequently, on December 1, 1990, OCDO executed a grant agreement with the American Electric Power Service Corporation (AEPSC) through its subsidiary, the Ohio Power Company, for the final design and construction (Phase II), testing and operation (Phase III), and marketing and future operation (Phase IV) of the facility. These phases were subcontracted to ICF Kaiser. AEPSC co-sponsored the project and donated a site at the Central Ohio Coal Company`s Unionville Coal Preparation Plant for locating the test plant. Central Ohio Coal supplied coal handling services, waste-product disposal, and water. The Ohio Power Company provided project oversight, electric power, and the test coals. The test results from the operation of the 30 tph advanced coal cleaning plant demonstrated that combining conventional physical coal cleaning with emerging advanced physical coal cleaning technologies was a cost-effective method to reduce sulfur emissions of Ohio coals. The following is a summary of the key findings of this project.
Contributing Partner: UNT Libraries Government Documents Department
DIRC Dreams: Research Directions for the Next Generation of Internally Reflected Imaging Counters

DIRC Dreams: Research Directions for the Next Generation of Internally Reflected Imaging Counters

Date: August 17, 1999
Creator: Ratcliff, Blair N
Description: Some conceptual design features of the total internally reflecting,imaging Cherenkov counter (DIRC) are described. Limits of the DIRC approach to particle identification, and a few features of alternative DIRC designs, are briefly explored.
Contributing Partner: UNT Libraries Government Documents Department
Preparing a Safety Analysis Report using the building block approach

Preparing a Safety Analysis Report using the building block approach

Date: March 1, 1990
Creator: Herrington, C.C.
Description: The credibility of the applicant in a licensing proceeding is severely impacted by the quality of the license application, particularly the Safety Analysis Report. To ensure the highest possible credibility, the building block approach was devised to support the development of a quality Safety Analysis Report. The approach incorporates a comprehensive planning scheme that logically ties together all levels of the investigation and provides the direction necessary to prepare a superior Safety Analysis Report.
Contributing Partner: UNT Libraries Government Documents Department
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