Serial/Series Title
Hanford Laboratories Operation Monthly Activities Report
43
Fiscal Year 2000
35
Fiscal Year 1999
28
Science & Technology Review
27
Fiscal Year 1997
26
LWBR Development Program
24
Fiscal Year 1998
22
Petroleum Marketing Monthly
19
Data Summary of Municipal Solid Waste Management Alternatives
18
Fiscal Year 1995
18
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58,333 Matching Results
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Controlled Deorbit
None
Date:
March 1, 1966
Creator:
Leonard, J. A. & Joseph, W. W.
Object Type:
Report
System:
The UNT Digital Library
Automated Controlled-Potential Coulometer for the IAEA
An automated controlled-potential coulometer has been developed at the Savannah River Site (SRS) for the determination of plutonium for use at the International Atomic Energy Agency`s (IAEA) Safeguards Analytical Laboratory in Siebersdorf, Austria. The system is functionally the same as earlier systems built for use at the Savannah River Site`s Analytical Laboratory. All electronic circuits and printed circuits boards have been upgraded with state-of-the-art components. A higher amperage potentiostat with improved control stability has been developed. The system achieves electronic calibration accuracy and linearity of better than 0.01 percent, with a precision and accuracy better than 0.1 percent has been demonstrated. This coulometer features electrical calibration of the integration system, electrolysis current background corrections, and control-potential adjustment capabilities. These capabilities allow application of the system to plutonium measurements without chemical standards, achieving traceability to the international measurement system through electrical standards and Faraday`s constant. the chemist is provided with the capability to perform measurements without depending upon chemical standards, which is a significant advantage for applications such as characterization of primary and secondary standards. Additional benefits include reducing operating cost to procure, prepare and measure calibration standards and the corresponding decrease in radioactive waste generation. The design and documentation of …
Date:
January 29, 1998
Creator:
Cordaro, J.V.; Holland, M.K. & Fields, T.
Object Type:
Article
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
Isotopically controlled semiconductors
A review of recent research involving isotopically controlled semiconductors is presented. Studies with isotopically enriched semiconductor structures experienced a dramatic expansion at the end of the Cold War when significant quantities of enriched isotopes of elements forming semiconductors became available for worldwide collaborations. Isotopes of an element differ in nuclear mass, may have different nuclear spins and undergo different nuclear reactions. Among the latter, the capture of thermal neutrons which can lead to neutron transmutation doping, can be considered the most important one for semiconductors. Experimental and theoretical research exploiting the differences in all the properties has been conducted and will be illustrated with selected examples. Manuel Cardona, the longtime editor-in-chief of Solid State Communications has been and continues to be one of the major contributors to this field of solid state physics and it is a great pleasure to dedicate this review to him.
Date:
November 15, 2004
Creator:
Haller, E. E.
Object Type:
Article
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.
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 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.
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
Computer-controlled radiation monitoring system
A computer-controlled radiation monitoring system was designed and installed at the Lawrence Livermore National Laboratory`s Multiuser Tandem Laboratory (10 MV tandem accelerator from High Voltage Engineering Corporation). The system continuously monitors the photon and neutron radiation environment associated with the facility and automatically suspends accelerator operation if preset radiation levels are exceeded. The system has proved reliable real-time radiation monitoring over the past five years, and has been a valuable tool for maintaining personnel exposure as low as reasonably achievable.
Date:
September 27, 1994
Creator:
Homann, S.G.
Object Type:
Article
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
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
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
Controlled Hydrogen Fleet and Infrastructure Analysis
This presentation summarizes controlled hydrogen fleet & infrastructure analysis undertaken for the DOE Fuel Cell Technologies Program.
Date:
June 10, 2010
Creator:
Wipke, K.; Sprik, S.; Kurtz, J. & Ramsden, T.
Object Type:
Presentation
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
Controlled Hydrogen Fleet and Infrastructure Analysis
This presentation by Keith Wipke at the 2007 DOE Hydrogen Program Annual Merit Review Meeting provides information about NREL's Controlled Hydrogen Fleet and Infrastructure Analysis Project.
Date:
May 17, 2007
Creator:
Wipke, K.
Object Type:
Presentation
System:
The UNT Digital Library