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490,278 Matching Results

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Results: 1 - 24 of 490,278 next
Best Match Title Creator Date Created (Newest) Date Created (Oldest) Date Added (Newest) Date Added (Oldest)
Controlled Deorbit (open access)

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 (open access)

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
[Controlled Vocabulary Graphic]

[Controlled Vocabulary Graphic]

This graphic expresses kinds of controlled vocabularies as a continuum of least to most complex and illustrates how different vocabularies are related; it includes notes describing the image on a separate page. The slide was used as a visual aid at a workshop during THATCamp (The Humanities and Technology Camp) as part of the Digital Frontiers conference at UNT Libraries.
Date: September 22, 2012
Creator: Tarver, Hannah
Object Type: Image
System: The UNT Digital Library
A REMOTELY CONTROLLED METALLOGRAPH (open access)

A REMOTELY CONTROLLED METALLOGRAPH

None
Date: January 1, 1955
Creator: Ross, J D
Object Type: Report
System: The UNT Digital Library
Isotopically controlled semiconductors (open access)

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
Are We There Yet? Toward a Workable Controlled Vocabulary for Music (open access)

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
A Study of Numerically Controlled Machines (open access)

A Study of Numerically Controlled Machines

This is a study of numerical control, its application, and the design of a numerical control program for a drilling machine. The study sought to obtain information on the function of numerical control; the different types of numerical control used by industry; and, the advantages of using numerical control.
Date: August 1967
Creator: Chan, John C. H.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Controlled Design Assumptions Document (open access)

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 (open access)

FORCE-CONTROLLED VIBRATION TESTING

None
Date: February 1, 1965
Creator: Otts, J.V.
Object Type: Report
System: The UNT Digital Library
How Hitler Controlled the Press (open access)

How Hitler Controlled the Press

Adolf Hitler advocated total control of the press for many years before he was elected Führer. Almost immediately after he assumed power in 1932, Hitler began writing new laws and regulations that totally exorcised all freedoms from the German press. This study follows the path that Hitler took to control the German press from 1920 until the end of World War II. It utilized translations of documents and statements by men whom Hitler appointed to control the press and books written by experts in the fields of communications as well as men who prosecuted Nazi war criminals after World War II. The study found that the control of the press was indeed a very necessary ingredient in Hitler's climb to power and remained crucial during his reign as Führer.
Date: May 1982
Creator: McConal, Billy Jon
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Controlled Design Assumptions Document (open access)

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. (open access)

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 (open access)

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 (open access)

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 (open access)

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
The Controlled Substances Act: Regulatory Requirements (open access)

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
The Controlled Substances Act: Regulatory Requirements (open access)

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.
Object Type: Report
System: The UNT Digital Library
The Controlled Substances Act: Regulatory Requirements (open access)

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.
Object Type: Report
System: The UNT Digital Library
Principles and Application of Numerically Controlled Machines (open access)

Principles and Application of Numerically Controlled Machines

The purpose of this study is threefold. First, numerical control will be analyzed objectively to ascertain its justification in terms of meeting the requirements of the basic manufacturing process phases. Secondly, the study will consist of an evaluation of the field of industrial arts in the Dallas-Fort Worth area to determine how numerical control has been accepted in the educational field and what preparation, if any, is being made to include the teaching of this new industrial concept. Thirdly, the study will investigate the feasibility and cost of installing numerically controlled equipment in the industrial arts laboratories of North Texas State University.
Date: May 1968
Creator: Koehler, Richard A.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
The Neutralization of the Figure Within a Controlled Environment (open access)

The Neutralization of the Figure Within a Controlled Environment

The questions I have addressed in regard to neutralization were as follows: 1. How important was the figure to the environment? 2. How far could the figure's physical presence be reduced and still contribute to the concepts of the painting? 3. How vividly was the figure presented while still complying with the requirements to meet neutralization? 4. Did color and texture aid in neutralizing the figure, and, if so, how? 5. Did the scale of the paintings have any effect on the neutralization process?
Date: August 1979
Creator: Gibson, John R.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Radiation Studies on Graphite With Controlled Processing. (open access)

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 (open access)

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 (open access)

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 (open access)

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