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67,296 Matching Results
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Controlled Deorbit
None
Date:
March 1, 1966
Creator:
Leonard, J. A. & Joseph, W. W.
System:
The UNT Digital Library
A REMOTELY CONTROLLED METALLOGRAPH
None
Date:
January 1, 1955
Creator:
Ross, J D
System:
The UNT Digital Library
Controlled Design Assumptions Document
This report addresses a controlled design assumptions document.
Date:
March 27, 1998
Creator:
United States. Department of Energy.
System:
The UNT Digital Library
FORCE-CONTROLLED VIBRATION TESTING
None
Date:
February 1, 1965
Creator:
Otts, J.V.
System:
The UNT Digital Library
Controlled Design Assumptions Document
The objective of the Controlled Design Assumptions Document (CDA) is to provide documentation and control of Mined Geologic Disposal System (MGDS) design assumptions in support of design and performance assessment in preparing for the Viability Assessment (VA).
Date:
September 12, 1996
Creator:
United States. Department of Energy.
System:
The UNT Digital Library
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
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.
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). The CSA and its implementing regulations establish a framework through which the federal government regulates the use of controlled substances for legitimate medical, scientific, research, and industrial purposes, and prevents these substances from being diverted for illegal purposes.
Date:
August 22, 2008
Creator:
Nichols, James E. & Yeh, Brian T.
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:
December 13, 2012
Creator:
Yeh, Brian T.
System:
The UNT Digital Library
Radiation Studies on Graphite With Controlled Processing.
None
Date:
January 1, 1967
Creator:
Cox, J. H., Jr.
System:
The UNT Digital Library
Controlled synthesis of polyenes by catalytic methods
The synthesis of the following polyenes, utilizing, a molybdenum catalyst, is described: vinyl alkylidene, and ortho-trimethylsilyl-phenylacetylene. (CBS).
Date:
January 1, 1990
Creator:
Schrock, R.R.
System:
The UNT Digital Library
A REMOTELY CONTROLLED METALLOGRAPH. PART II
A Bausch and Lomb metallograph that had been adapted so that it could be operated remotely was modified further to facilitate its operation. The instrument has performed satisfactorily in the examination of highly radioactive materials behind the heavy shielding of a high level cell. (auth)
Date:
December 1, 1959
Creator:
Leith, W.H.
System:
The UNT Digital Library
Controlled-source magnetotellurics: source effects
In this paper we evaluate the CSMT impedance in the wavenumber domain, and compare the result with the full EM impedance obtained from the exact solution over the layered earth. Preliminary results show that we can find a pair of wavenumbers that reproduces the full EM impedance over the frequency range affected by source effects. This observation suggests that it is now possible to obtain the electrical resistivity using the low-frequency EM impedance data that can be represented by a pair of wavenumbers, thereby greatly simplifying the computational requirements. The process will involve a non-linear inversion of near-source impedance data for a pair of wavenumbers and a layered-earth resistivity structure.
Date:
April 1, 1999
Creator:
Smith, T. & Lee, K. H.
System:
The UNT Digital Library
Microprocessor-controlled scanning densitometer system
An Automated Scanning Densitometer System has been developed by uniting a microprocessor with a low energy x-ray densitometer system. The microprocessor controls the detector movement, provides self-calibration, compensates raw readings to provide time-linear output, controls both data storage and the host computer interface, and provides measurement output in engineering units for immediate reading. The densitometer, when used in a scanning mode, is a precision reference instrument that provides chordal average density measurements over the cross section of a pipe under steady-state flow conditions. Results have shown an improvement over the original densitometer in reliability and repeatability of the system, an a factor-of-five improvement in accuracy.
Date:
April 1, 1980
Creator:
Shurtliff, R.W.
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.
System:
The UNT Digital Library
Atomic data for controlled fusion research
Presented is an evaluated graphical and tabular compilation of atomic and molecular cross sections of interest to controlled thermonuclear research. The cross sections are tabulated and graphed as a function of energy for collision processes involving heavy particles, electrons, and photons with atoms and ions. Also included are sections on data for particle penetration through macroscopic matter, particle transport properties, particle interactions with surfaces, and pertinent charged particle nuclear cross sections and reaction rates. In most cases estimates have been made of the data accuracy.
Date:
February 1, 1977
Creator:
Barnett, C. F.; Ray, J. A.; Ricci, E.; Wilker, M. I.; McDaniel, E. W.; Thomas, E. W. et al.
System:
The UNT Digital Library
Supplemental Insert Sheets for Engineering Materials List.
None
Date:
January 1, 1968
Creator:
Kelly, R.C. (ed.)
System:
The UNT Digital Library
Controlled Hydrogen Fleet and Infrastructure Demonstration Project
This program was undertaken in response to the US Department of Energy Solicitation DE-PS30-03GO93010, resulting in this Cooperative Agreement with the Ford Motor Company and BP to demonstrate and evaluate hydrogen fuel cell vehicles and required fueling infrastructure. Ford initially placed 18 hydrogen fuel cell vehicles (FCV) in three geographic regions of the US (Sacramento, CA; Orlando, FL; and southeast Michigan). Subsequently, 8 advanced technology vehicles were developed and evaluated by the Ford engineering team in Michigan. BP is Ford's principal partner and co-applicant on this project and provided the hydrogen infrastructure to support the fuel cell vehicles. BP ultimately provided three new fueling stations. The Ford-BP program consists of two overlapping phases. The deliverables of this project, combined with those of other industry consortia, are to be used to provide critical input to hydrogen economy commercialization decisions by 2015. The program's goal is to support industry efforts of the US President's Hydrogen Fuel Initiative in developing a path to a hydrogen economy. This program was designed to seek complete systems solutions to address hydrogen infrastructure and vehicle development, and possible synergies between hydrogen fuel electricity generation and transportation applications. This project, in support of that national goal, was designed …
Date:
March 31, 2010
Creator:
Staley, Dr. Scott
System:
The UNT Digital Library
Microprocessor-controlled, programmable ramp voltage generator
A special-purpose voltage generator has been developed for driving the quadrupole mass filter of a residual gas analyzer. The generator is microprocessor-controlled with desired ramping parameters programmed by setting front-panel digital thumb switches. The start voltage, stop voltage, and time of each excursion are selectable. A maximum of five start-stop levels may be pre-selected for each program. The ramp voltage is 0 to 10 volts with sweep times from 0.1 to 999.99 seconds.
Date:
November 1, 1978
Creator:
Hopwood, J.
System:
The UNT Digital Library
Remotely controlled large container disposal methodology
Remotely Handled Large Containers (RHLC), also called drag-off boxes, have been used at the Hanford Site since the 1940s to dispose of large pieces of radioactively contaminated equipment. These containers are typically large steel-reinforced concrete boxes, which weigh as much as 40 tons. Because large quantities of high-dose waste can produce radiation levels as high as 200 mrem/hour at 200 ft, the containers are remotely handled (either lifted off the railcar by crane or dragged off with a cable). Many of the existing containers do not meet existing structural and safety design criteria and some of the transportation requirements. The drag-off method of pulling the box off the railcar using a cable and a tractor is also not considered a safe operation, especially in view of past mishaps.
Date:
September 1, 1994
Creator:
Amir, S. J.
System:
The UNT Digital Library
Optimally Controlled Flexible Fuel Powertrain System
The primary objective of this project was to develop a true Flex Fuel Vehicle capable of running on any blend of ethanol from 0 to 85% with reduced penalty in usable vehicle range. A research and development program, targeting 10% improvement in fuel economy using a direct injection (DI) turbocharged spark ignition engine was conducted. In this project a gasoline-optimized high-technology engine was considered and the hardware and configuration modifications were defined for the engine, fueling system, and air path. Combined with a novel engine control strategy, control software, and calibration this resulted in a highly efficient and clean FFV concept. It was also intended to develop robust detection schemes of the ethanol content in the fuel integrated with adaptive control algorithms for optimized turbocharged direct injection engine combustion. The approach relies heavily on software-based adaptation and optimization striving for minimal modifications to the gasoline-optimized engine hardware system. Our ultimate objective was to develop a compact control methodology that takes advantage of any ethanol-based fuel mixture and not compromise the engine performance under gasoline operation.
Date:
December 31, 2010
Creator:
Yilmaz, Hakan; Christie, Mark & Stefanopoulou, Anna
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
System:
The UNT Digital Library
Automated controlled-potential coulometer for plutonium determination
The automated controlled-potential coulometer for the determination of plutonium described in this report is the second in a series of automated instruments designed to determine plutonium and uranium contents in nuclear fuel cycle materials. The measurement precision of the instrument is 0.1% relative standard deviation at the 5-mg plutonium level. A highly selective method of analysis was developed, involving reduction of plutonium to Pu(III) in a 5.5 M hydrochloric acid-0.015 M sulfamic acid electrolyte; oxidation of diverse ions, but not Pu(III); addition of phosphate complexant to reduce the Pu(III)-Pu(IV) potential; and oxidation of Pu(III) to Pu(IV) as the measurement step. Construction details of the mechanical and electrical systems of the instrument and control-system software are described, along with instrument preoperational adjustments and tests and sample analysis operations.
Date:
May 1, 1981
Creator:
Hollen, R. M. & Jackson, D. D.
System:
The UNT Digital Library
Optimally Controlled Flexible Fuel Powertrain System
A multi phase program was undertaken with the stated goal of using advanced design and development tools to create a unique combination of existing technologies to create a powertrain system specification that allowed minimal increase of volumetric fuel consumption when operating on E85 relative to gasoline. Although on an energy basis gasoline / ethanol blends typically return similar fuel economy to straight gasoline, because of its lower energy density (gasoline ~ 31.8MJ/l and ethanol ~ 21.1MJ/l) the volume based fuel economy of gasoline / ethanol blends are typically considerably worse. This project was able to define an initial engine specification envelope, develop specific hardware for the application, and test that hardware in both single and multi-cylinder test engines to verify the ability of the specified powertrain to deliver reduced E85 fuel consumption. Finally, the results from the engine testing were used in a vehicle drive cycle analysis tool to define a final vehicle level fuel economy result. During the course of the project, it was identified that the technologies utilized to improve fuel economy on E85 also enabled improved fuel economy when operating on gasoline. However, the E85 fueled powertrain provided improved vehicle performance when compared to the gasoline fueled …
Date:
June 30, 2011
Creator:
Sheppard, Duncan; Woodrow, Bruce; Kilmurray, Paul & Thwaite, Simon
System:
The UNT Digital Library