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324
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7,259 Matching Results
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Mathematical modeling and economic analysis of membrane separation of hydrogen from gasifier synthesis gas
Investigators are studying hydrogen purification by membrane technology as a means to make the coal-to-hydrogen route economically attractive. To allow prediction of membrane performance and to facilitate comparisons between membrane and other technologies (cryogenic distillation, pressure swing adsorption), they developed a mathematical model to describe the permeation process inside a membrane module. The results of this model were compared with available experimental data (separation of CO{sub 2}/O{sub 2}/N{sub 2} mixtures). The model was first used to calculate the gas permeabilities from one set of mixed-gas experiments; the resulting permeabilities were then used to predict the results of the other mixed-gas experiments. The agreement between these predictions and the experimental data was good. However, model predictions using gas permeabilities obtained in pure gas experiments did not agree with the mixed gas experimental data. This disagreement is believed to be due to plasticization of the membrane by contact with CO{sub 2}. These results indicate that data obtained from experiments with mixed-gas feeds are necessary to adequately predict membrane performance when CO{sub 2} is present. The performance of different system configurations, including one and two stages of membrane modules, was examined. The different configurations examined were single module (SM), single module with recycle …
Date:
October 13, 1988
Creator:
Roberts, D.L. & Gottschlich, D.E.
Object Type:
Report
System:
The UNT Digital Library
Clinch River breeder reactor sodium fire protection system design and development
To assure the protection of the public and plant equipment, improbable accidents were hypothesized to form the basis for the design of safety systems. One such accident is the postulated failure of the Intermediate Heat Transfer System (IHTS) piping within the Steam Generator Building (SGB), resulting in a large-scale sodium fire. This paper discusses the design and development of plant features to reduce the consequences of the accident to acceptable levels. Additional design solutions were made to mitigate the sodium spray contribution to the accident scenario. Sodium spill tests demonstrated that large sodium leaks can be safely controlled in a sodium-cooled nuclear power plant.
Date:
April 13, 1984
Creator:
Foster, K.W.; Boasso, C.J. & Kaushal, N.N.
Object Type:
Article
System:
The UNT Digital Library
Data processing for the 1/5-scale Boiling Water Reactor Mark I pressure suppression experiment
A description is given of methods used for data reduction and post-processing of reduced data for the 1/5-scale Boiling Water Reactor (BWR) Mark I pressure suppression experiment. Output from approximately 200 transducers, recorded onto analog magnetic tape, were reduced to engineering quantities with an analog-to-digital, COBOL-like conversion code. The reduced data were analyzed with conversational FORTRAN codes and mass-processed for reports with batch-processing FORTRAN codes.
Date:
January 13, 1978
Creator:
Lai, W. & McCauley, E.W.
Object Type:
Report
System:
The UNT Digital Library
Initial measurements of beam breakup instability in the advanced test accelerator
This paper reports the measurements of beam breakup (BBU) instability performed on the Advanced Test Accelerator (ATA) up to the end of February, 1984. The main objective was to produce a high current usable electron beam at the ATA output. A well-known instability is BBU which arises from the accelerator cavity modes interacting with the electron beam. The dominant mode is TM/sub 130/ at a frequency of approximately 785 MHz. It couples most strongly to the beam motion and has been observed to grow in the Experimental Test Accelerator (ETA) which has only eight accelerator cavities. ATA has one hundred and seventy cavities and, therefore, the growth of BBU is expected to be more severe. In this paper, BBU measurements are reported for ATA with beam currents of 4 to 7 kA. Analysis showed that the growth of the instability with propagation distance was as expected for the lower currents. However, the high-current data showed an apparent higher growth rate than expected. An explanation for this anomaly is given in terms of a ''corkscrew'' excitation. The injector BBU noise level for a field emission brush cathode was found to be an order of magnitude lower than for a cold plasma …
Date:
May 13, 1985
Creator:
Chong, Y.P.; Caporaso, G.J. & Struve, K.W.
Object Type:
Article
System:
The UNT Digital Library
Compressor surge counter
A surge counter for a rotating compressor is provided which detects surging by monitoring the vibration signal from an accelerometer mounted on the shaft bearing of the compressor. The circuit detects a rapid increase in the amplitude envelope of the vibration signal, e.g., 4 dB or greater in less than one second, which is associated with a surge onset and increments a counter. The circuit is rendered nonresponsive for a period of about 5 seconds following the detection which corresponds to the duration of the surge condition. This prevents multiple registration of counts during the surge period due to rapid swings in vibration amplitude during the period.
Date:
April 13, 1981
Creator:
Castleberry, K.N.
Object Type:
Patent
System:
The UNT Digital Library
Receiver for solar-energy collector having improved aperture aspect
A secondary concentrator for use in receiver systems for linear focusing primary concentrators is provided with reflector wings at each end. The wings increase the capture of light rays reflected from areas adjacent the rim of a primary concentrator, increasing the apparent aperture size of the receiver as viewed from the rim of the primary concentrator. The length, tilt, and curvature of the wing reflectors can be adjusted to provide a receiver having a desired aperture aspect.
Date:
March 13, 1981
Creator:
McIntire, W.R.
Object Type:
Patent
System:
The UNT Digital Library
Wildfire Fuels and Fuel Reduction
This report examines wildfire biomass fuels. It discusses fuel characteristics and their relation to wildfire intensity and spread, and includes a description of actions proposed to reduce biomass fuel levels, their effectiveness for protecting property and resources from wildfires, and their impacts on other resource values. It concludes with an examination of the federal authorities for fuel reduction activities on federal and non-federal lands, together with data on the funding provided under each of these authorities.
Date:
May 13, 2013
Creator:
Bracmort, Kelsi
Object Type:
Report
System:
The UNT Digital Library
Crime and Forfeiture
This report provides an overview of federal forfeiture law. It sketches the origins and general attributes of forfeiture, describes the distribution of the hundreds of millions of dollars it generates, and identifies some of the related constitutional issues.
Date:
May 13, 2013
Creator:
Doyle, Charles
Object Type:
Report
System:
The UNT Digital Library
The President's Office of Science and Technology Policy (OSTP): Issues for Congress
This report provides an overview of the history of science and technology (S&T) advice to the President and discusses selected issues and options for Congress regarding the Office of Science and Technology Policy (OSTP) Director, OSTP management and operations, the President's Council of Advisors on Science and Technology (PCAST), and the National Science and Technology Council (NSTC).
Date:
January 13, 2014
Creator:
Sargent, John F., Jr. & Shea, Dana A.
Object Type:
Report
System:
The UNT Digital Library
Military Funeral Honors and Military Cemeteries: Frequently Asked Questions
This report provides answers to frequently asked questions about military funeral honors and military cemeteries, including information on the eligibility criteria, required components of the honor detail, and the funeral ceremony. It also cites legislation that mandates that the Department of Defense (DOD) make military funeral honors available to every eligible veteran upon request.
Date:
January 13, 2014
Creator:
Torreon, Barbara Salazar
Object Type:
Report
System:
The UNT Digital Library
Internet Governance and the Domain Name System: Issues for Congress
This report provides a definition regarding Internet governance and how the Internet is currently governed. The report discusses the role of United States government and future model of Internet governance.
Date:
November 13, 2013
Creator:
Kruger, Lennard G.
Object Type:
Report
System:
The UNT Digital Library
Vulnerable Youth: Background and Policies
This report first provides an overview of the youth population and the increasing complexity of the transition to adulthood for all adolescents with a discussion of the concept of "disconnectedness," as well as the protective factors youth can develop during childhood and adolescence that can mitigate poor outcomes. Further, the report describes the evolution of federal youth policy and provides a brief overview of current federal programs targeted at vulnerable youth, and discusses the challenges of coordinating federal programs for youth, as well as federal legislation and initiatives that promote coordination among federal agencies and support programs with a positive youth development focus.
Date:
January 13, 2014
Creator:
Fernandes-Alcantara, Adrienne L.
Object Type:
Report
System:
The UNT Digital Library
Congressional Liaison Offices of Selected Federal Agencies
This report provides a list of roughly 200 congressional liaison offices, and is intended to help congressional offices in placing telephone calls and addressing correspondence to government agencies.
Date:
August 13, 2013
Creator:
Crane-Hirsch, Audrey C.
Object Type:
Report
System:
The UNT Digital Library
O-MM-0109-c Provision of Certified DON data to BRAC 05 JCSGs
Disregard Restriction of Header and Footer: O-MM-0109-c Provision of Certified DON data to BRAC 05 JCSGs. Navy memo dtd June 1, 2004. Department of Navy Activities with Corrections to Data Call 1 (DataCalll-3.
Date:
October 13, 2005
Creator:
United States. Department of Defense.
Object Type:
Text
System:
The UNT Digital Library
O-MM-0109-ca Provision of Certified DON data to BRAC 05 JCSGs
Disregard Restriction of Header and Footer: O-MM-0109-ca Provision of Certified DON data to BRAC 05 JCSGs. Navy memo dtd October 4, 2004. Department of Navy Activities with Corrections to Data Call 1 (DataCall 1-21) and Supplemental Data Calls; and Department or the Navy Activities with Corrections to Data Call 2 (DataCall 2-7).
Date:
October 13, 2005
Creator:
United States. Department of Defense.
Object Type:
Text
System:
The UNT Digital Library
O-MM-0109-cb Provision of Certified DON data to BRAC 05 JCSGs
Disregard Restriction of Header and Footer: O-MM-0109-cb Provision of Certified DON data to BRAC 05 JCSGs. Navy memo dtd October 7, 2004. Department of Navy Activities with Corrections to Intelligence JCSG Data Call 1: Capacity Analysis, 18 March 04 (IJCSG Data Call 1-05); and Department of Navy Activities with Corrections to Intelligence JCSG Data Call 2: Military Value, 13 August 04 (IJCSG Data Call 2-02).
Date:
October 13, 2005
Creator:
United States. Department of Defense.
Object Type:
Text
System:
The UNT Digital Library
O-MM-0109-cc Provision of Certified DON data to BRAC 05 JCSGs
Disregard Restriction of Header and Footer: O-MM-0109-cc Provision of Certified DON data to BRAC 05 JCSGs. Navy memo dtd October 12, 2004. Department of Navy Activities with Certified Data - Criterion Seven, 14 June.
Date:
October 13, 2005
Creator:
United States. Department of Defense.
Object Type:
Text
System:
The UNT Digital Library
Broadband Loan and Grant Programs in the USDA's Rural Utilities Service
Report that discusses the broadband loan and grant programs at Rural Utilities Service (RUS) that is intended to accelerate the deployment of broadband services in rural America.
Date:
June 13, 2013
Creator:
Kruger, Lennard G.
Object Type:
Report
System:
The UNT Digital Library
Navy CG(X) Cruiser Program: Background for Congress
Report that provides background information on the U.S. Navy's CG(X) program as it existed prior to its proposed cancellation.
Date:
January 13, 2011
Creator:
O'Rourke, Ronald
Object Type:
Report
System:
The UNT Digital Library
Pakistan's Nuclear Weapons: Proliferation and Security Issues
Report that discusses Pakistan's efforts to produce fissile material and other issues related to nuclear proliferation and improving its nuclear arsenal. It also discusses the steps Pakistan has taken to increase international confidence in its nuclear security.
Date:
January 13, 2011
Creator:
Kerr, Paul K. & Nikitin, Mary Beth
Object Type:
Report
System:
The UNT Digital Library
O-MM-0109-cd Provision of Certified DON data to BRAC 05 JCSGs
Disregard Restriction of Header and Footer: O-MM-0109-cd Provision of Certified DON data to BRAC 05 JCSGs. Navy memo dtd October 12, 2004. Department of Navy Activities with Corrections to Data Call 1 (DataCall 1-22) and Supplemental Data Calls; Department or the Navy Activities with Corrections to Data Call 2 (DataCall 2-8).
Date:
October 13, 2005
Creator:
United States. Department of Defense.
Object Type:
Text
System:
The UNT Digital Library
Satellite Surveillance: Domestic Issues
Report that provides background on the development of intelligence satellites and identifies the roles various agencies play in their management and use. Issues surrounding the current policy and proposed changes are discussed, followed by a discussion of legal considerations.
Date:
January 13, 2011
Creator:
Best, Richard A., Jr. & Elsea, Jennifer K.
Object Type:
Report
System:
The UNT Digital Library
International Drug Control Policy: Background and U.S. Responses
The report provides background information on drug cultivation, drug trafficking and the consequences of drug trade. This report discusses challenges created by the global illegal drug trade, including: undermining political and regional stability, bolstering the role and capabilities of transnational criminal organizations in the drug trade, and the burden caused by drug use an addition on local communities and economic development. In addition, this report discusses U.S. policy efforts to thwart illegal drug trade.
Date:
August 13, 2013
Creator:
Wyler, Liana Sun
Object Type:
Report
System:
The UNT Digital Library
O-MM-0109-ce Provision of Certified DON Data to BRAC 05 JCSGs
Disregard Restriction of Header and Footer: O-MM-0109-ce Provision of Certified DON Data to BRAC 05 JCSGs. Navy memo dtd October 15, 2004. Department of Navy Activities with Corrections to Intelligence JCSG Data Call 2: Military Value, 13 August 04 (IJCSG Data Call 2-03).
Date:
October 13, 2005
Creator:
United States. Department of Defense.
Object Type:
Text
System:
The UNT Digital Library