Partner
UNT Libraries Government Documents Department
38,644
Oklahoma Historical Society
4,784
UNT Libraries
1,282
Abilene Library Consortium
494
Sterling Municipal Library
421
Abilene Public Library
298
Rosenberg Library
177
Denton Public Library
157
Brownwood Public Library
146
Hopkins County Genealogical Society
119
208 More
Collection
Office of Scientific & Technical Information Technical Reports
37,850
Texas Digital Newspaper Program
8,093
Oklahoma Digital Newspaper Program
5,007
Tocker Foundation Grant
2,939
Abilene Library Consortium
1,006
The Oklahoma City Times
796
Chickasha Newspaper Collection
436
The Baytown Sun
386
Sapulpa Area Newspaper Collection
347
Ladd & Katherine Hancher Library Foundation
339
539 More
Country
States
Decade
Month
Day
51,838 Matching Results
Results open in a new window/tab. Unexpected Results? Search the Catalog Instead.
Results:
1 - 24 of
51,838
next
Controlled Deorbit
None
Date:
March 1, 1966
Creator:
Leonard, J. A. & Joseph, W. W.
Object Type:
Report
System:
The UNT Digital Library
A REMOTELY CONTROLLED METALLOGRAPH
None
Date:
January 1, 1955
Creator:
Ross, J D
Object Type:
Report
System:
The UNT Digital Library
FORCE-CONTROLLED VIBRATION TESTING
None
Date:
February 1, 1965
Creator:
Otts, J.V.
Object Type:
Report
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
Object Type:
Report
System:
The UNT Digital Library
Physics with isotopically controlled semiconductors
Control of the isotopic composition of semiconductors offers a wide range of new scientific opportunities. In this paper a number of recent results obtained with isotopically pure as well as deliberately mixed diamond and Ge bulk single crystals and Ge isotope superlattices will be reviewed. Isotopic composition affects several properties such as phonon energies, bandstructure and lattice constant in subtle but theoretically well understood ways. Large effects are observed for thermal conductivity, local vibrational modes of impurities and after neutron transmutation doping (NTD). Several experiments which could profit greatly from isotope control are proposed.
Date:
August 1, 1994
Creator:
Haller, E. E.
Object Type:
Article
System:
The UNT Digital Library
Technology of controlled nuclear fusion
Separate abstracts were prepared for each of the 28 included papers. Abstracts for the remaining 43 papers appeared earlier in ERA. (MOW)
Date:
January 1, 1978
Creator:
Powell, J R & Eterno, C T
Object Type:
Article
System:
The UNT Digital Library
Technology of controlled nuclear fusion
Separate abstracts were prepared for 38 of the included papers. Abstracts have appeared earlier in ERA for the remaining 32 papers. (MOW)
Date:
January 1, 1978
Creator:
Powell, J R & Eterno, C T
Object Type:
Article
System:
The UNT Digital Library
Radiation Studies on Graphite With Controlled Processing.
None
Date:
January 1, 1967
Creator:
Cox, J. H., Jr.
Object Type:
Report
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.
Object Type:
Report
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.
Object Type:
Report
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.
Object Type:
Report
System:
The UNT Digital Library
An investigation of a passively controlled haptic interface
Haptic interfaces enhance cooperation between humans and robotic manipulators by providing force and tactile feedback to the human user during the execution of arbitrary tasks. The use of active actuators in haptic displays presents a certain amount of risk since they are capable of providing unacceptable levels of energy to the systems upon which they operate. An alternative to providing numerous safeguards is to remove the sources of risk altogether. This research investigates the feasibility of trajectory control using passive devices, that is, devices that cannot add energy to the system. Passive actuators are capable only of removing energy from the system or transferring energy within the system. It is proposed that the utility of passive devices is greatly enhanced by the use of redundant actuators. In a passive system, once motion is provided to the system, presumably by a human user, passive devices may be able to modify this motion to achieve a desired resultant trajectory. A mechanically passive, 2-Degree-of-Freedom (D.O.F.) manipulator has been designed and built. It is equipped with four passive actuators: two electromagnetic brakes and two electromagnetic clutches. This paper gives a review of the literature on passive and robotics and describes the experimental test bed …
Date:
March 1, 1997
Creator:
Davis, J. T. & Book, W. J.
Object Type:
Article
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.
Object Type:
Report
System:
The UNT Digital Library
Controlled Hydrogen Fleet and Infrastructure Analysis
This presentation summarizes controlled hydrogen fleet and infrastructure analysis.
Date:
May 1, 2011
Creator:
Wipke, K.; Sprik, S.; Kurtz, J.; Ramsden, T.; Ainscough, C. & Saur, G.
Object Type:
Presentation
System:
The UNT Digital Library
Controlled Hydrogen Fleet and Infrastructure Analysis
This is a presentation about the Fuel Cell Electric Vehicle Learning Demo, a 7-year project and the largest single FCEV and infrastructure demonstration in the world to date. Information such as its approach, technical accomplishments and progress; collaborations and future work are discussed.
Date:
May 1, 2012
Creator:
Wipke, K.; Sprik, S.; Kurtz, J.; Ramsden, T.; Ainscough, C. & Saur, G.
Object Type:
Presentation
System:
The UNT Digital Library
Controlled Hydrogen Fleet and Infrastructure Analysis
None
Date:
May 1, 2006
Creator:
Wipke, K.
Object Type:
Presentation
System:
The UNT Digital Library
Surface effects in controlled thermonuclear fusion
During the operation of large size plasma facilities and future controlled thermonuclear fusion reactors the surfaces of such major components as container walls, beam limiters, diverter walls and beam-dump walls of the injector region will be exposed to particle and photon bombardment from primary plasma radiations and from secondary radiations. Such radiations can cause, for example, physical and chemical sputtering, blistering, particle- and photon- impact induced desorption, secondary electron and x-ray emission, backscattering, nuclear reactions, photo-decomposition of surface compounds, photocatalysis, and vaporization. Such effects in turn can (a) seriously damage and erode the bombarded surface and (b) release major quantities of impurities which will contaminate the plasma. The effects of some of the major surface phenomena on the operation of plasma facilities and future fusion reactors are discussed. (auth)
Date:
August 1, 1975
Creator:
Kaminsky, M.
Object Type:
Article
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.
Object Type:
Report
System:
The UNT Digital Library
Supplemental Insert Sheets for Engineering Materials List.
None
Date:
January 1, 1968
Creator:
Kelly, R.C. (ed.)
Object Type:
Report
System:
The UNT Digital Library
Controlled Hydrogen Fleet & Infrastructure Analysis
A PowerPoint presentation given as part of the 2005 Hydrogen Program Review, May 24, 2005, in Washington, D.C.
Date:
May 1, 2005
Creator:
Wipke, K.
Object Type:
Presentation
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.
Object Type:
Report
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.
Object Type:
Report
System:
The UNT Digital Library
Computer-controlled data communications test center
This paper describes the software developed for a computer-based test center used in testing and diagnosing a large network of terminal and remote processor communications links. The software runs in time-base-scheduled and on-demand interactive modes. It includes a control program, several measurement tasks, Datatrieve-11 databases, and various graphical display programs, all running under RSX11M, V4.0, on a PDP-11/70.
Date:
January 1, 1982
Creator:
Horning, R. R.; Creel, L. R. & Doll, M. A.
Object Type:
Article
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