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40,863 Matching Results
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Controlled fabrication of nanowire sensors.
We present a simple top down approach based on nanoimprint lithography to create dense arrays of silicon nanowires over large areas. Metallic contacts to the nanowires and a bottom gate allow the operation of the array as a field-effect transistor with very large on/off ratios. When exposed to ammonia gas or cyclohexane solutions containing nitrobenzene or phenol, the threshold voltage of the field-effect transistor is shifted, a signature of charge transfer between the analytes and the nanowires. The threshold voltage shift is proportional to the Hammett parameter and the concentration of the nitrobenzene and phenol analytes. For the liquid analytes considered, we find binding energies of 400 meV, indicating strong physisorption. Such values of the binding energies are ideal for stable and reusable sensors.
Date:
October 1, 2007
Creator:
Leonard, Francois
Object Type:
Report
System:
The UNT Digital Library
The Controlled Substances Act: Regulatory Requirements
This report highlights certain non-criminal regulatory requirements of the Controlled Substances Act (CSA).
Date:
October 28, 2008
Creator:
Nichols, James E. & Yeh, Brian T.
Object Type:
Report
System:
The UNT Digital Library
CARBON DIOXIDE MITIGATION THROUGH CONTROLLED PHOTOSYNTHESIS
This research was undertaken to meet the need for a robust portfolio of carbon management options to ensure continued use of coal in electrical power generation. In response to this need, the Ohio Coal Research Center at Ohio University developed a novel technique to control the emissions of CO{sub 2} from fossil-fired power plants by growing organisms capable of converting CO{sub 2} to complex sugars through the process of photosynthesis. Once harvested, the organisms could be used in the production of fertilizer, as a biomass fuel, or fermented to produce alcohols. In this work, a mesophilic organism, Nostoc 86-3, was examined with respect to the use of thermophilic algae to recycle CO{sub 2} from scrubbed stack gases. The organisms were grown on stationary surfaces to facilitate algal stability and promote light distribution. The testing done throughout the year examined properties of CO{sub 2} concentration, temperature, light intensity, and light duration on process viability and the growth of the Nostoc. The results indicate that the Nostoc species is suitable only in a temperature range below 125 F, which may be practical given flue gas cooling. Further, results indicate that high lighting levels are not suitable for this organism, as bleaching occurs …
Date:
October 1, 2000
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Legal Issues Relating to the Disposal of Dispensed Controlled Substances
Prescription drug abuse is the second-most common form of illicit drug abuse among teenagers in the United States, trailing only marijuana use. Prescription drug abuse has become a particular concern amongst federal policymakers. This report discusses this issue, including related pieces of legislation such as the Controlled Substances Act, the Secure and Responsible Drug Disposal Act of 2010, and the proper way to dispose of controlled substances.
Date:
October 19, 2010
Creator:
Yeh, Brian T.
Object Type:
Report
System:
The UNT Digital Library
Author's guide to publishing in the fields of plasma physics and controlled fusion
None
Date:
October 1, 1981
Creator:
unknown
Object Type:
Article
System:
The UNT Digital Library
INSTRUMENTED TEMPERATURE-CONTROLLED CAPSULES FOR IRRADIATIONS IN THE CP-5 REACTOR
Instrumented, temperature-controlled irradiation capsules are being operated in the vertical fuel tubes of the CP-5 test reactor. The fuel tubes were modified in order to divert reactor coolant into the tubes to cool the capsules, and the shield plugs were revised to accommodate the capsule assemblies. Fuel materials and structural materials were successfully irradinted for periods in excess of one year. A description is included of the present capsule and assembly, the method of temperature control and instrumentation, and performance characteristics of the capsules. (auth)
Date:
October 1, 1962
Creator:
Beck, W.N. & Fousek, R.J.
Object Type:
Report
System:
The UNT Digital Library
The Controlled Synthesis of Metastable Oxides Utilizing Epitaxy and Epitaxial Stabilization
The research enabled by this DOE grant led to 13 publications in leading refereed journals including Physical Review Letters and Applied Physics Letters as well as feature articles in the Journal of the American Ceramic Society and Physik Journal (the German equivalent of Physics Today distributed to all members of the German Physical Society) on the controlled synthesis of metastable oxides utilizing epitaxy and epitaxial stabilization. In total our results fill over 100 pages of archived journals and are attached.
Date:
October 30, 2009
Creator:
Schlom, Dr. Darrell G.
Object Type:
Report
System:
The UNT Digital Library
Controlled sample program publication No. 1: characterization of rock samples.
A description is presented of the methodology used and the geologic parameters measured on several rocks which are being used in round-robin laboratory and nuclide adsorption methodology experiments. Presently investigators from various laboratories are determining nuclide distribution coefficients utilizing numerous experimental techniques. Unfortunately, it appears that often the resultant data are dependent not only on the type of groundwater and rock utilized, but also on the experimentor or method used. The Controlled Sample Program is a WISAP (Waste Isolation Safety Assessment Program) attempt to resolve the apparent method and dependencies and to identify individual experimenter's bias. The rock samples characterized in an interlaboratory Kd methodology comparison program include Westerly granite, Argillaceous shale, Oolitic limestone, Sentinel Gap basalt, Conasauga shale, Climax Stock granite, anhydrite, Magenta dolomite and Culebra dolomite. Techniques used in the characterization include whole rock chemical analysis, X-ray diffraction, optical examination, electron microprobe elemental mapping, and chemical analysis of specific mineral phases. Surface areas were determined by the B.E.T. and ethylene glycol sorption methods. Cation exchange capacities were determined with /sup 85/Sr, but were of questionable value for the high calcium rocks. A quantitative mineralogy was also estimated for each rock. Characteristics which have the potential of strongly affecting …
Date:
October 1978
Creator:
Ames, L. L.
Object Type:
Report
System:
The UNT Digital Library
Oxygen potential of uranium--plutonium oxide as determined by controlled- atmosphere thermogravimetry
The oxygen-to-metal atom ratio, or O/M, of solid solution uranium- plutonium oxide reactor fuel is a measure of the concentration of crystal defects in the oxide which affect many fuel properties, particularly, fuel oxygen potential. Fabrication of a high-temperature oxygen electrode, employing an electro-active tip of oxygen-deficient solid-state electrolyte, intended to confirm gaseous oxygen potentials is described. Uranium oxide and plutonium oxide O/M reference materials were prepared by in situ oxidation of high purity metals in the thermobalance. A solid solution uranium-plutonium oxide O/M reference material was prepared by alloying the uranium and plutonium metals in a yttrium oxide crucible at 1200$sup 0$C and oxidizing with moist He at 250$sup 0$C. The individual and solid solution oxides were isothermally equilibrated with controlled oxygen potentials between 800 and 1300$sup 0$C and the equilibrated O/ M ratios calculated with corrections for impurities and buoyancy effects. Use of a reference oxygen potential of -100 kcal/mol to produce an O/M of 2.000 is confirmed by these results. However, because of the lengthy equilibration times required for all oxides, use of the O/M reference materials rather than a reference oxygen potential is recommended for O/M analysis methods calibrations. (auth)
Date:
October 1, 1975
Creator:
Swanson, G.C.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Long-term corrosion/oxidation studies under controlled humidity conditions
Independent of thermal loading scenarios, the waste packages at the potential repository at Yucca Mountain, Nevada will be exposed to environmental conditions where there is the possibility of significant water film formation occurring on the waste packages. Water films can cause aggressive aqueous film electrochemical corrosion on susceptible metals or alloys. Water film formation will be facilitated when relative humidities are high, when hygroscopic salts are present on the surfaces, when corrosion products are hygroscopic, and when particles form crevices with the surfaces (capillary effect). Also certain gaseous contaminants, such as, NO{sub x} and SO{sub 2}, can facilitate water film formation. It should be noted that water film formation can occur at isolated spots (e.g. surface defects and salt particles) and need not cover the entire surface for electrochemical corrosion to occur. This activity will characterize the long term corrosion of metal specimens at two nominal relative humidities (50 and 85%) and at 80 C. Under the low relative humidity (50%) condition, water film formation is expected to be limited and therefore aqueous film electrochemical corrosion is expected also to be limited. Under the high relative humidity (85%) condition, significant water film formation is expected to occur under some test …
Date:
October 13, 1997
Creator:
Gdowski, G.
Object Type:
Report
System:
The UNT Digital Library
Updated candidate list for engineered barrier materials
This report describes candidate materials to be evaluated over the next several years during advanced design phases for the waste package to be used for the underground disposal of high-level radioactive wastes at the Yucca Mountain facility.
Date:
October 1, 1995
Creator:
McCright, R.D.
Object Type:
Report
System:
The UNT Digital Library
Computer-Controlled Gas Chromatograph Capable of ''Real-Time'' Readout of High-Precision Data.
A gas chromatograph has been assembled which provides computer control of sample injection, column temperature, and flow rate, plus direct computer readout of inlet pressure, mass flow rate, and detector response. Data processing yields, in real-time, a standard deviation of less than 0.05% in retention time, which is comparable to previous results obtained using an off-line computer. However, corrected retention volumes determined in real-time had a standard deviation of about 0.4% which reflected primarily the uncertainty in flow measurement.
Date:
October 31, 1971
Creator:
Swingle, R. S. & Rogers, L.B .
Object Type:
Report
System:
The UNT Digital Library
Top ten list of user-hostile interface design
This report describes ten of the most frequent ergonomic problems found in human-computer interfaces (HCIs) associated with complex industrial machines. In contrast with being thought of as ``user friendly,`` many of these machines are seen as exhibiting ``user-hostile`` attributes by the author. The historical lack of consistent application of ergonomic principles in the HCIs has led to a breed of very sophisticated, complex manufacturing equipment that few people can operate without extensive orientation, training, or experience. This design oversight has produced the need for extensive training programs and help documentation, unnecessary machine downtime, and reduced productivity resulting from operator stress and confusion. Ergonomic considerations affect industrial machines in at least three important areas: (1) the physical package including CRT and keyboard, maintenance access areas, and dedicated hardware selection, layout, and labeling; (2) the software by which the user interacts with the computer that controls the equipment; and (3) the supporting documentation.
Date:
October 1, 1994
Creator:
Miller, D. P.
Object Type:
Article
System:
The UNT Digital Library
Light source job list and plan: Part 1
This note is intended to describe our current thinking and to show interconnections of various subtasks. The discussed topics are: (1) Storage Ring Group - A. Refinement of lattices to include: photons from bending magnets, dynamic aperture studies, refinement of accelerator physics straight section, B. Non-standard lattice, C. Touschek lifetime, D. Gas scattering lifetime, E. BBI (bunched beam instabilities), F. Magnet error considerations, G. tracking of particles, H. Orthogonal adjustments of beam positions and angles, (2) Injector Group, (3) Linac Group, (4) RF Group, (5) Alignment and stability, (6) Technical Components, (7) Vacuum, (8) Diagnostics, and (9) Control System.
Date:
October 29, 1984
Creator:
Cho, Y.
Object Type:
Report
System:
The UNT Digital Library
Drug Offenses: Maximum Fines and Terms of Imprisonment for Violation of the Federal Controlled Substances Act and Related Laws
This report is a chart of the maximum fines and terms of imprisonment that may be imposed as a consequence of conviction for violation of the federal Controlled Substance Act (CSA) and other drug supply and drug demand related laws.
Date:
October 23, 2008
Creator:
Doyle, Charles & Yeh, Brian T.
Object Type:
Report
System:
The UNT Digital Library
Excess Foundry Sand Characterization and Experimental Investigation in Controlled Low-Strength Material and Hot-Mixing Asphalt
This report provides technical data regarding the reuse of excess foundry sand. The report addresses three topics: (1) a statistically sound evaluation of the characterization of foundry sand, (2) a laboratory investigation to qualify excess foundry sand as a major component in controlled low-strength material (CLSM), and (3) the identification of the best methods for using foundry sand as a replacement for natural aggregates for construction purposes, specifically in asphalt paving materials. The survival analysis statistical technique was used to characterize foundry sand over a full spectrum of general chemical parameters, metallic elements, and organic compounds regarding bulk analysis and leachate characterization. Not limited to characterization and environmental impact, foundry sand was evaluated by factor analyses, which contributes to proper selection of factor and maximization of the reuse marketplace for foundry sand. Regarding the integration of foundry sand into CLSM, excavatable CLSM and structural CLSM containing different types of excess foundry sands were investigated through laboratory experiments. Foundry sand was approved to constitute a major component in CLSM. Regarding the integration of foundry sand into asphalt paving materials, the optimum asphalt content was determined for each mixture, as well as the bulk density, maximum density, asphalt absorption, and air voids …
Date:
October 31, 2004
Creator:
Tikalsky, Pauul J.
Object Type:
Report
System:
The UNT Digital Library
Excess Foundry Sand Characterization and Experimental Investigation in Controlled Low-Strength Material and Hot-Mixing Asphalt
This report provides technical data regarding the reuse of excess foundry sand. The report addresses three topics: a statistically sound evaluation of the characterization of foundry sand, a laboratory investigation to qualify excess foundry sand as a major component in controlled low-strength material (CLSM), and the identification of the best methods for using foundry sand as a replacement for natural aggregates for construction purposes, specifically in asphalt paving materials. The survival analysis statistical technique was used to characterize foundry sand over a full spectrum of general chemical parameters, metallic elements, and organic compounds regarding bulk analysis and leachate characterization. Not limited to characterization and environmental impact, foundry sand was evaluated by factor analyses, which contributes to proper selection of factor and maximization of the reuse marketplace for foundry sand. Regarding the integration of foundry sand into CLSM, excavatable CLSM and structural CLSM containing different types of excess foundry sands were investigated through laboratory experiments. Foundry sand was approved to constitute a major component in CLSM. Regarding the integration of foundry sand into asphalt paving materials, the optimum asphalt content was determined for each mixture, as well as the bulk density, maximum density, asphalt absorption, and air voids at Nini, Ndes, …
Date:
October 15, 2004
Creator:
Paul J. Tikalsky, Hussain U. Bahia, An Deng and Thomas Snyder
Object Type:
Report
System:
The UNT Digital Library
Pacific Northwest Laboratory report on controlled thermonuclear reactor technology, January 1975 - September 1975
The PNL staff has been studying fusion technology in areas such as economics, fusion-fission hybrid concepts, materials, neutronics, environment and safety. These studies have been scoped to make efficient use of ERDA resources, and to complement and support efforts at other laboratories. The effect the plasma and associated radiation and emission will have upon the surfaces of the first wall are being studied. Neutron sputtering experiments were made on niobium and gold and the results were evaluated for absolute neutron yields. Molybdenum and vanadium were studied for effects of ion bombardment under various conditions of helium injection. Graphite cloth is being irradiated for examination of radiation effects because it is suggested for use in several CTR concepts as a shield between the plasma and the first wall. Helium effects are being studied to characterize degradation of structural metal properties. Work is progressing on absolute measurement of the electrical resistivity of insulators and the demonstration of the feasibility of producing insulating coatings by sputter deposition. (auth)
Date:
October 1, 1975
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Los Alamos Controlled Air Incinerator for radioactive waste. Volume II. Engineering design reference manual
This two-volume report is a detailed design and operating documentation of the Los Alamos National Laboratory Controlled Air Incinerator (CAI) and is an aid to technology transfer to other Department of Energy contractor sites and the commercial sector. Volume I describes the CAI process, equipment, and performance, and it recommends modifications based on Los Alamos experience. It provides the necessary information for conceptual design and feasibility studies. Volume II provides descriptive engineering information such as drawings, specifications, calculations, and costs. It aids duplication of the process at other facilities.
Date:
October 1, 1982
Creator:
Koenig, R. A.; Draper, W. E.; Newmyer, J. M. & Warner, C. L.
Object Type:
Report
System:
The UNT Digital Library
The "FTO List" and Congress: Sanctioning Designated Foreign Terrorist Organizations
The purpose of this report is to provide Congress with an overview of the nature and status of the designated foreign terrorist organizations list, as a potential tool in overseeing the implementation and effects of U.S. legislation designed to sanction terrorists
Date:
October 21, 2003
Creator:
Cronin, Audrey Kurth
Object Type:
Report
System:
The UNT Digital Library
Analysis and test results for a two-bladed, passive cycle pitch, horizontal-axis wind turbine in free and controlled yaw
This report surveys the analysis and tests performed at Washington University in St. Louis, Missouri, on a horizontal-axis, two-laded wind turbine with teeter hub. The introduction is a brief account of results obtained during the 5-year period ending December 1985. The wind tunnel model and the test turbine (7.6 m [25 ft.] in diameter) at Washington University`s Tyson Research Center had a 67{degree} delta-three angle of the teeter axis. The introduction explains why this configuration was selected and named the passive cycle pitch (PCP) wind turbine. Through the analysis was not limited to the PCP rotor, all tests, including those done from 1986 to 1994, wee conducted with the same teetered wind rotor. The blades are rather stiff and have only a small elastic coning angle and no precone.
Date:
October 1, 1995
Creator:
Holenemser, K. H.
Object Type:
Report
System:
The UNT Digital Library
Prescription Drug Abuse
This report goes into detail about the complications of federal policies in preventing drug abuse, and the role of the federal government in reducing the abuse of prescription drugs.
Date:
October 16, 2014
Creator:
Bagalman, Erin; Sacco, Lisa N.; Thaul, Susan & Yeh, Brian T.
Object Type:
Report
System:
The UNT Digital Library
Title list of documents made publicly available, August 1-31, 1995
This document is the August 1995 listing of publicly available documents that are issued by the Nuclear Regulatory Commission. The compilation is broken down into docketed and undocketed items, and each of these categories is further broken down into narrower categories. In general, the docketed items pertain to specific NRC licensees, while the undocketed items are of general interest to all licensees of a particular group.
Date:
October 1, 1995
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Description, field test and data analysis of a controlled-source EM system (EM-60). [Leach Hot Springs, Grass Valley]
The three sections describe the transmitter, the receiver, and data interpretations and indicate the advances made toward the development of a large moment electromagnetic (EM) system employing a magnetic dipole source. A brief description is given of the EM-60 transmitter, its general design, and the consideration involved in the selection of a practical coil size and weight for routine field operations. A programmable, multichannel, multi-frequency, phase-sensitive receiver is described. A field test of the EM-60, the data analysis and interpretation procedures, and a comparison between the survey results and the results obtained using other electrical techniques are presented. The Leach Hot Springs area in Grass Valley, Pershing County, Nevada, was chosen for the first field site at which the entire system would be tested. The field tests showed the system capable of obtaining well-defined sounding curves (amplitude and phase of magnetic fields) from 1 kHz down to 0.1 Hz. (MHR)
Date:
October 1, 1978
Creator:
Morrison, H. F.; Goldstein, N. E.; Hoversten, M.; Oppliger, G. & Riveros, C.
Object Type:
Report
System:
The UNT Digital Library