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38,903 Matching Results
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Are We There Yet? Toward a Workable Controlled Vocabulary for Music
This article discusses moving toward a workable controlled vocabulary for music.
Date:
July 2012
Creator:
McKnight, Mark, 1951-
Object Type:
Article
System:
The UNT Digital Library
Large-scale cryopumping for controlled fusion
Vacuum pumping by freezing out or otherwise immobilizing the pumped gas is an old concept. In several plasma physics experiments for controlled fusion research, cryopumping has been used to provide clean, ultrahigh vacua. Present day fusion research devices, which rely almost universally upon neutral beams for heating, are high gas throughput systems, the pumping of which is best accomplished by cryopumping in the high mass-flow, moderate-to-high vacuum regime. Cryopumping systems have been developed for neutral beam injection systems on several fusion experiments (HVTS, TFTR) and are being developed for the overall pumping of a large, high-throughput mirror containment experiment (MFTF). In operation, these large cryopumps will require periodic defrosting, some schemes for which are discussed, along with other operational considerations. The development of cryopumps for fusion reactors is begun with the TFTR and MFTF systems. Likely paths for necessary further development for power-producing reactors are also discussed.
Date:
July 25, 1977
Creator:
Pittenger, L. C.
Object Type:
Article
System:
The UNT Digital Library
Sensor-Based Demand Controlled Ventilation
In most buildings, occupancy and indoor pollutant emission rates vary with time. With sensor-based demand-controlled ventilation (SBDCV), the rate of ventilation (i.e., rate of outside air supply) also varies with time to compensate for the changes in pollutant generation. In other words, SBDCV involves the application of sensing, feedback and control to modulate ventilation. Compared to ventilation without feedback, SBDCV offers two potential advantages: (1) better control of indoor pollutant concentrations; and (2) lower energy use and peak energy demand. SBDCV has the potential to improve indoor air quality by increasing the rate of ventilation when indoor pollutant generation rates are high and occupants are present. SBDCV can also save energy by decreasing the rate of ventilation when indoor pollutant generation rates are low or occupants are absent. After providing background information on indoor air quality and ventilation, this report provides a relatively comprehensive discussion of SBDCV. Topics covered in the report include basic principles of SBDCV, sensor technologies, technologies for controlling air flow rates, case studies of SBDCV, application of SBDCV to laboratory buildings, and research needs. SBDCV appears to be an increasingly attractive technology option. Based on the review of literature and theoretical considerations, the application of SBDCV …
Date:
July 1997
Creator:
De Almeida, Anibal T. & Fisk, William J.
Object Type:
Report
System:
The UNT Digital Library
Legal Issues Relating to the Disposal of Dispensed Controlled Substances
This report describes the provisions of the Controlled Substances Act and its implementing regulations that relate to patient disposal of unwanted prescription medication, as well as provides an analysis of the pending legislation.
Date:
July 30, 2010
Creator:
Yeh, Brian T.
Object Type:
Report
System:
The UNT Digital Library
Computer-controlled neutron time-of-flight spectrometer
None
Date:
July 1, 1973
Creator:
Merriman, S. H.
Object Type:
Report
System:
The UNT Digital Library
Controlled Velocity Testing of an 8-kW Wind Turbine
This paper describes a case study of the controlled-velocity test of an 8-kW wind turbine. The turbine was developed in response to the U.S. Department of Energy's small wind turbine program. As background, the prototype development is discussed. The turbine mechanical and electrical components are described. The turbine was tested on a flatbed truck and driven down an airfield runway at constant relative wind speed. Horizontal furling was used to control over-speed. Various parameters were changed to determine their effects on furling. The testing showed that the machine had insufficient rotor offset for adequate furling. Also, a rotor resonance problem was discovered and remedied. Problems associated with taking the measurements made it difficult to determine if the truck test was a suitable method for code validation. However, qualitative observations gleaned from the testing justified the effort.
Date:
July 31, 2001
Creator:
Larwood, S.; Sencenbaugh, J. & Acker, B.
Object Type:
Article
System:
The UNT Digital Library
Novel Phase-Chance Soft Actuators Controlled via Peltier
Soft actuation methods are a developing field of robotics deemed suitable for physical human-robot interactions due to the adaptability of materials and compliant structures. Thermo-active soft actuators are a subset of these which convert thermal energy to mechanical work in the form of elongation, bending, or twisting to conform to the environment. This study is divided into three major studies that all use actuators with a working principle of phase-change fluid vaporizing for expansion with applied heat from a Peltier. The first study evaluates the bandwidth and efficiency between (i) traditional Joule heating, and (ii) Peltier heating, finding that Peltier heating can considerably improve the operational bandwidth of the actuator. The second study uses a thin membrane actuator placed in a braided mesh to form a McKibben muscle capable of lifting 5N, and formed into a gripper capable of manipulating objects within the environment. The third study uses actuators of a solid, hollow and flexible Peltier embedded silicone structure and are evaluated and optimized in order to increase actuation speed, finding that the embedded flexible Peltier design was able to elongate over 50% of its original height in 20 seconds. The overall aim of all of these studies was to …
Date:
July 2023
Creator:
Johnson, Daniel Cody
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Defense Inventory: Property Being Shipped to Disposal Is Not Properly Controlled
A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO provided information on the Department of Defense's (DOD) management procedures for controlling excess weapon system parts, components, equipment, and other inventory items that are being shipped to disposal, focusing on the: (1) types and amounts of excess property that is reported as not received when shipped to disposal; and (2) weaknesses in management controls over excess property that is being shipped to disposal that makes it vulnerable to waste, abuse, or loss."
Date:
July 1, 1999
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
Biodegradation of BTEX and Other Petroleum Hydrocarbons by Enhanced and Controlled Sulfate Reduction
High concentrations of sulfide in the groundwater at a field site near South Lovedale, OK, were inhibiting sulfate reducing bacteria (SRB) that are known to degrade contaminants including benzene, toluene, ethylbenzene, and m+p-xylenes (BTEX). Microcosms were established in the laboratory using groundwater and sediment collected from the field site and amended with various nutrient, substrate, and inhibitor treatments. All microcosms were initially amended with FeCl{sub 2} to induce FeS precipitation and, thereby, reduce sulfide concentrations. Complete removal of BTEX was observed within 39 days in treatments with various combinations of nutrient and substrate amendments. Results indicate that elevated concentration of sulfide is a limiting factor to BTEX biodegradation at this site, and that treating the groundwater with FeCl{sub 2} is an effective remedy to facilitate and enhance BTEX degradation by the indigenous SRB population. On another site in Moore, OK, studies were conducted to investigate barium in the groundwater. BTEX biodegradation by SRB is suspected to mobilize barium from its precipitants in groundwater. Data from microcosms demonstrated instantaneous precipitation of barium when sulfate was added; however, barium was detected redissolving for a short period and precipitating eventually, when active sulfate reduction was occurring and BTEX was degraded through the process. …
Date:
July 1, 2007
Creator:
Jin, Song
Object Type:
Report
System:
The UNT Digital Library
North Korea: Terrorism List Removal?
This report discusses the removal of North Korea's inclusion on the U.S. list of terrorism-supporting countries.
Date:
July 10, 2008
Creator:
Niksch, Larry
Object Type:
Report
System:
The UNT Digital Library
North Korea: Terrorism List Removal
The issue of North Korea's inclusion on the U.S. list of terrorism-supporting countries has been a major issue in U.S.-North Korean diplomacy since 2000, particularly in connection with negotiations over North Korea's nuclear program. North Korea demanded that the Clinton and Bush Administration remove North Korea from the terrorism support list. Secretary of State Clinton said on June 7, 2009, that the Obama Administration would consider reinstating North Korea on the list of state supporters of terrorism. However, she said that there would have to be "recent evidence of their support for international terrorism."
Date:
July 1, 2009
Creator:
Niksch, Larry A.
Object Type:
Report
System:
The UNT Digital Library
INNOVATIVE METHODOLOGY FOR DETECTION OF FRACTURE-CONTROLLED SWEET SPOTS IN THE NORTHERN APPALACHIAN BASIN
The primary goal was to enter Phase 2 by analyzing geophysical logs and sidewall cores from a verification well drilled into the Trenton/Black River section along lineaments. However, the well has not yet been drilled; Phase 2 has therefore not been accomplished. Secondary goals in Phase I were also completed for the last reporting period. Thus, no new data were collected for this reporting period, and only soil gas surveys were reanalyzed and re-displayed in the region of the Trenton/Black River wells. The soil gas profiles in the region of the Trenton/Black River wells show that individual large-magnitude soil gas anomalies (spikes) are rarely wider than 50 m. Even clusters of soil gas spikes are only on the order of 200-250 m wide. Thus, widely-spaced sampling will not necessarily represent the actual number and location of soil gas seeps. The narrowness of the anomalies suggests that the seeps result from single fractures or narrow fracture intensification domains (FIDs). Many of the lineaments from EarthSat (1997) and straight stream segments coincide (or are very close to) soil gas spikes, but we collected many more soil gas spikes than lineaments. Among some of the soil gas box surveys, a possible ENE-trend of …
Date:
July 8, 2004
Creator:
Jacobi, Robert & Fountain, John
Object Type:
Report
System:
The UNT Digital Library
INNOVATIVE METHODOLOGY FOR DETECTION OF FRACTURE-CONTROLLED SWEET SPOTS IN THE NORTHERN APPALACHIAN BASIN
In the structure task, the goals for this reporting period were to: (1) complete analyses of field work on the NNW-SSE transect along the west side of Cayuga Lake. We have completed data input and analyses for this goal, and discuss the results. The additional data from the 2002 field season (and additional revised data from the previous season) demonstrate that zones of closely-spaced E-striking fractures bear a close spatial correlation with the E-striking Firtree Anticline. East-striking EarthSat (1997) Landsat lineaments also occur in the same general region as the Firtree Anticline. However, one E-striking lineament occurs where we have no sites with a high E-striking fracture frequency. ENE-striking closely-spaced fractures occur where ENE-striking lineaments occur. From the Seneca lake transect, these fractures intensification domains and lineaments are thought to mark zones of reactivated Trenton/Black River faults. In the advanced seismic analyses task, the goals for this reporting period were to complete analyses of the seismic data. We have completed data the data analyses and find that high porosity zones can be recognized along some of the Trenton/Black River fault zones. These data continue to demonstrate that integration of aeromagnetic and Landsat lineaments, surface structure, soil gas and seismic allows …
Date:
July 1, 2003
Creator:
Jacobi, Robert & Fountain, John
Object Type:
Report
System:
The UNT Digital Library
Partially Nested Randomized Controlled Trials in Education Research: A Guide to Design and Analysis
A detailed guide showing the process of designing, conducting and analyzing results from Partially Nested Randomized Controlled Trials (PN-RCT) in education research. The guide includes a brief review of Individual-Level Randomized Controlled Trial (I-RCT) and Cluster Randomized Controlled Trials (C-RCT) in comparison with PN-RCT.
Date:
July 2014
Creator:
Lohr, Sharon
Object Type:
Report
System:
The UNT Digital Library
Optics and materials research for controlled radiant energy transfer in buildings. Final technical report
The primary objective of this project was to perform the optics and materials research necessary to identify and solve the technical problems associated with fabricating durable, variable reflectivity electrochromic windows for energy efficient buildings and vehicles. The research performed at the Tufts Electro-Optics Technology Center (EOTC) has identified and solved nearly all the significant problems, as discussed below in this final technical report. There still remains, however, one important problem to be solved--i.e., to better understand the science of deposition processes and thereby develop and optimize one or more production-worthy deposition processes that could be used for the practical production of affordable, variable reflectivity electrochromic windows. Therefore, it is recommended that such studies be carried out with the goals of: (1) determining the probable practical limits of performance; and, very importantly, (2) to develop and optimize deposition processes that could be used for the practical production of affordable electrochromic windows.
Date:
July 1, 1996
Creator:
Goldner, R.B.
Object Type:
Report
System:
The UNT Digital Library
Analysis of design strategies for mitigating the consequences of lithium fire within containment of controlled thermonuclear reactors
A lithium combustion model (LITFIRE) was developed to describe the physical and chemical processes which occur during a hypothetical lithium spill and fire. The model was used to study the effectiveness of various design strategies for mitigating the consequences of lithium fire, using the UWMAK-III features as a reference design. Calculations show that without any special fire protection measures, the containment may reach pressures of up to 32 psig when one coolant loop is spilled inside the reactor building. Temperatures as high as 2000/sup 0/F would also be experienced by some of the containment structures. These consequences were found to diminish greatly by the incorporation of a number of design strategies including initially subatmospheric containment pressures, enhanced structural surface heat removal capability, initially low oxygen concentrations, and active post-accident cooling of the containment gas. The EBTR modular design was found to limit the consequences of a lithium spill, and hence offers a potential safety advantage. Calculations of the maximum flame temperature resulting from lithium fire indicate that none of the radioactive first wall materials under consideration would vaporize, and only a few could possibly melt.
Date:
July 1, 1978
Creator:
Dube, D A & Kazimi, M S
Object Type:
Report
System:
The UNT Digital Library
Social Science Policies: An Annotated List of Recent Literature
This report is a bibliography created to update the Congressional Research Service multilith, "The Social Sciences and Public Policy: A Selected, Annotated Bibliography."
Date:
July 8, 1971
Creator:
Knezo, Genevieve
Object Type:
Report
System:
The UNT Digital Library
Art therapy and music reminiscence activity in the prevention of cognitive decline: study protocol for a randomized controlled trial
This article explores the feasibility of using art therapy and music reminiscence activity to improve the cognition of community living elderly with mild cognitive impairment.
Date:
July 12, 2017
Creator:
Mahendran, Rathi; Rawtaer, Iris; Fam, Johnson; Wong, Jonathan; Kumar, Alan Prem; Gandhi, Mihir et al.
Object Type:
Article
System:
The UNT Digital Library
Tax Administration: Comparison of the Reported Tax Liabilities of Foreign- and U.S.-Controlled Corporations, 1998-2005
A letter report issued by the Government Accountability Office with an abstract that begins "Concerns about transfer pricing abuse have led researchers to compare the tax liabilities of foreign- and U.S.-controlled corporations. (Transfer prices are the prices related companies charge on intercompany transactions.) However, such comparisons are complicated because other factors may explain the differences in reported tax liabilities. In three prior reports, GAO found differences in the percentages of foreign-controlled and U.S.-controlled corporations reporting no tax liability. GAO was asked to update the previous reports by comparing: (1) the tax liabilities of foreign-controlled domestic corporations (FCDC) and U.S.-controlled corporations (USCC)-including those reporting zero tax liabilities for 1998 through 2005 (the latest available data) and (2) characteristics of FCDCs and USCCs such as age, size, and industry. GAO analyzed data from the Internal Revenue Service's Statistics of Income samples of corporate tax returns. GAO does not make any recommendations in this report. In commenting on a draft of this report, IRS provided comments on technical issues, which we incorporated into this report where appropriate."
Date:
July 24, 2008
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
Modulation and SSR tests performed on the BPA 500 kV thyristor controlled series capacitor unit at Slatt substation
Field experience is reported for a thyristor controlled series capacitor (TCSC) recently commissioned at BPA`s Slatt substation. Subsynchronous resonance tests show that TCSC interactions with shaft dynamics of PGE`s Boardman steam generator are well understood and are effectively avoided by normal TCSC valve firing logic. Modulation tests, performed with the Boardman plant off line, show that the TCSC can be a powerful and responsive actuator for swing damping. Security considerations did not permit lightly damped operation of the controlled plant. Close analysis indicates that the TCSC damping contribution, though small, was measurable. The best estimate is that damping for the McNary mode is 7.33% and 8.55%, for the TCSC damper loop open and closed respectively. TCSC testing and monitoring is facilitated by an advanced interactive measurement network representing BPA`s approach to the information requirements of major control systems.
Date:
July 1, 1995
Creator:
Hauer, J. F.; Mittelstadt, W. A.; Piwko, R. J.; Damsky, B. L. & Eden, J. D.
Object Type:
Article
System:
The UNT Digital Library
Geographic and Operational Site Parameters List (GOSPL) for the 2004 Composite Analysis
This report briefly describes each of the key data fields, including the source(s) of data, and provides the resulting inputs to be used for the 2004 Composite Analysis. A master spreadsheet termed the Geographic and Operational Site Parameters List (GOSPL) was assembled to facilitate the generation of keyword input files containing general information on each waste site, its operational/disposal history, and its environmental settings (past, current, and future).
Date:
July 1, 2004
Creator:
Last, George V.; Nichols, William E. & Kincaid, Charles T.
Object Type:
Report
System:
The UNT Digital Library
Decision analysis for continuous cover gas monitoring of Ferrocyanide Watch List tanks
This document pertains to underground waste storage tanks at the Hanford Site that have been identified to potentially contain a significant amount of ferrocyanide compounds. This document evaluates the need for continuously monitoring the headspace vapors in Ferrocyanide Watch List tanks to detect flammable gases or gases that could indicate the occurrence of a propagating ferrocyanide-nitrate/nitrite reaction. The results of modeling studies and gas monitoring, and sludge sample analyses of actual ferrocyanide tank wastes have indicated no need to continuously monitor the vapor spaces in ferrocyanide tanks. This conclusion is based in part on the following factors: (1) a study performance on waste aging suggests that the ferrocyanide has degraded in the tanks during the more than 35 years of storage; therefore, the ferrocyanide is not present in concentrations that could support an exothermic reaction, also, the moisture present in the waste is sufficient to preclude a self-sustaining (propagating) ferrocyanide-nitrate reaction; (2) evaluation of core sample results from Tank 241-C-109 and Tank 241-C-112 support laboratory studies showing that ferrocyanide has degraded and the fuel concentration in the tanks is considerably lower than postulated by flowsheet simulants; (3) no gases have been identified that would indicate the occurrence of a ferrocyanide …
Date:
July 1, 1994
Creator:
Fowler, K. D. & Graves, R. D.
Object Type:
Report
System:
The UNT Digital Library
Title list of documents made publicly available. Volume 16, Number 5
The Title List of Documents Made Publicly Available contains descriptions of the information received and generated by the US Nuclear Regulatory Commission (NRC). This information includes (1) docketed material associated with civilian nuclear power plants and other uses of radioactive materials and (2) nondocketed material received and generated by NRC pertinent to its role as a regulatory agency. As used here, docketed does not refer to Court dockets; it refers to the system by which NRC maintains its regulatory records. This series of documents is indexed by a Personal Author Index, a Corporate Source Index, and a Report Number Index.
Date:
July 1, 1994
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Title list of documents made publicly available. Volume 17, No. 5
The Title List of Documents Made Publicly Available is a monthly publication. It contains descriptions of the information received and generated by the US Nuclear Regulatory Commission (NRC). This information includes (1) docketed material associated with civilian nuclear power plants and other uses of radioactive materials and (3) nondocketed material received and generated by NRC pertinent to its role as a regulatory agency. As used here, docketed does not refer to Court dockets; it refers to the system by which NRC maintains its regulatory records. This series of documents is indexed by a Personal Author Index, a Corporate Source Index, and a Report Number Index.
Date:
July 1, 1995
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library