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1,895 Matching Results
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1. Mono((8)annulene)Uranium(4) half-sandwich complexes, 2. Novel syntheses of symmetrically substituted cyclooctatetetraenes
A reproducible, high-yield synthesis of mono((8)annulene)uranium(4)dichloride (1) is reported, along with the X-ray crystal structural of the bis(pyridine) adduct. Metathesis reactions of the half-sandwich complex 1 with a variety of simple alkyl and alkoxy reagents failed to generate any isolable mono-ring complexes. Reactions of 1 with polydentate, delocalized anions did produce stable derivatives, including mono((8)annulene)uranium(4)bis(acetylacetonate) (4). An X-ray crystal structure of 4 is reported.
Date:
October 1, 1991
Creator:
Boussie, T. R.
Object Type:
Report
System:
The UNT Digital Library
1. Mono([8]annulene)Uranium(4) half-sandwich complexes, 2. Novel syntheses of symmetrically substituted cyclooctatetetraenes
A reproducible, high-yield synthesis of mono([8]annulene)uranium(4)dichloride (1) is reported, along with the X-ray crystal structural of the bis(pyridine) adduct. Metathesis reactions of the half-sandwich complex 1 with a variety of simple alkyl and alkoxy reagents failed to generate any isolable mono-ring complexes. Reactions of 1 with polydentate, delocalized anions did produce stable derivatives, including mono([8]annulene)uranium(4)bis(acetylacetonate) (4). An X-ray crystal structure of 4 is reported.
Date:
October 1, 1991
Creator:
Boussie, T. R.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
A 2-GHz Rectangular Corrugated Horn
We have designed, constructed and tested a large, rectangular horn antenna with a center frequency of 2.0 GHz, corrugated on the E-plane walls, made out of aluminum sheet. A new technique has been developed to solder thin aluminum strips onto the back plane to form the corrugations. The radiation beam pattern shows half-power beamwidths of 12{sup 0} and 14{sup 0} in the H and E planes respectively, and side lobe response below -40 dB at angles greater than 50{sup 0} from horn axis. The measured return loss is less than -20 dB (VSWR < 1.22) between 1.7 and 2.3 GHz; insertion loss is less than 0.15 dB.
Date:
October 1, 1991
Creator:
Bersanelli, M.; Bensadoun, M.; De Amici, Giovanni; Limon, M.; Smoot, George F.; Tanaka, S. et al.
Object Type:
Article
System:
The UNT Digital Library
23 to 300{degrees}C demagnetization resistance of samarium-cobalt permanent magnets
The influence of temperature on the knee point and squareness of the M-H demagnetization characteristic of permanent magnets is important information for the full utilization of the capabilities of samarium-cobalt magnets at high temperatures in demagnetization-resistant permanent magnet devices. Composite plots of the knee field and the demagnetizing field required to produce a given magnetic induction swing below remanence were obtained for several commercial Sm{sub 2}Co{sub 17}-type magnet samples in the temperature range of 23 to 300{degrees}C. The knee point was used to define the limits of operation safe against irreversible demagnetization, and the resulting plots are interpreted to show the temperature-induction swing limits of safe magnet operation. The observed second quadrant M-H characteristic squareness is shown, by two measures, to increase gradually with temperature and to peak in the interval 200 to 300{degrees}C.
Date:
October 1, 1991
Creator:
Niedra, J. M. & Overton, E.
Object Type:
Report
System:
The UNT Digital Library
200-BP-5 operable unit Technical Baseline report
This report supports development of a remedial investigation/feasibility study work plan for the 200-BP-5 operable unit. The report summarizes baseline information for waste sites and unplanned release sites located in the 200-BP-5 operable unit. The sites were investigated by the Technical Baseline Section of the Environmental Engineering Group, Westinghouse Hanford Company (Westinghouse Hanford). The investigation consisted of review and evaluation of current and historical Hanford Site reports, drawings, and photographs, and was supplemented with recent inspections of the Hanford Site and employee interviews. No field investigations or sampling were conducted.
Date:
October 1, 1991
Creator:
Jacques, I. D. & Kent, S. K.
Object Type:
Report
System:
The UNT Digital Library
15th Street News (Midwest City, Okla.), Vol. 20, No. 5, Ed. 1 Friday, October 4, 1991
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
October 4, 1991
Creator:
Kelly, Frank
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
15th Street News (Midwest City, Okla.), Vol. 20, No. 6, Ed. 1 Friday, October 11, 1991
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
October 11, 1991
Creator:
Kelly, Frank
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
15th Street News (Midwest City, Okla.), Vol. 20, No. 7, Ed. 1 Friday, October 18, 1991
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
October 18, 1991
Creator:
Kelly, Frank
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
15th Street News (Midwest City, Okla.), Vol. 20, No. 8, Ed. 1 Friday, October 25, 1991
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
October 25, 1991
Creator:
Kelly, Frank
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
[1991 David Duke political campaign ad]
Video of a political advertisement for David Duke's 1991 campaign for the Louisiana gubernatorial race. Duke was a state representative from the 81st district in the Louisiana House from February 1989 through January 1992. Slide card title: Roemer/Edwards
Date:
October 10, 1991
Creator:
unknown
Object Type:
Video
System:
The UNT Digital Library
[1991 David Duke political campaign ad]
Video of a political advertisement for David Duke's 1991 campaign for the Louisiana gubernatorial race. Duke was a state representative from the 81st district in the Louisiana House from February 1989 through January 1992. Slide card title: Baton Rouge.
Date:
October 7, 1991
Creator:
unknown
Object Type:
Video
System:
The UNT Digital Library
[1991 David Duke political campaign ad]
Video of a political advertisement for David Duke's 1991 campaign for the Louisiana gubernatorial race. Duke was a state representative from the 81st district in the Louisiana House from February 1989 through January 1992. Slide card title: Baton Rouge.
Date:
October 7, 1991
Creator:
unknown
Object Type:
Video
System:
The UNT Digital Library
[1991 David Duke political campaign ad]
Video of a political advertisement for David Duke's 1991 campaign for the Louisiana gubernatorial race. Duke was a state representative from the 81st district in the Louisiana House from February 1989 through January 1992. Slide card title: Roemer/Edwards.
Date:
October 10, 1991
Creator:
unknown
Object Type:
Video
System:
The UNT Digital Library
1991 US-Japan workshop on Nuclear Fusion in Dense Plasmas
The scientific areas covered at the Workshop may be classified into the following subfields: (1) basic theory of dense plasma physics and its interface with atomic physics and nuclear physics; (2) physics of dense z-pinches, ICF plasmas etc; (3) stellar interior plasmas; (4) cold fusion; and (5) other dense plasmas.
Date:
October 1991
Creator:
Ichimaru, S. & Tajima, T.
Object Type:
Article
System:
The UNT Digital Library
1991 US-Japan workshop on Nuclear Fusion in Dense Plasmas. Proceedings
The scientific areas covered at the Workshop may be classified into the following subfields: (1) basic theory of dense plasma physics and its interface with atomic physics and nuclear physics; (2) physics of dense z-pinches, ICF plasmas etc; (3) stellar interior plasmas; (4) cold fusion; and (5) other dense plasmas.
Date:
October 1, 1991
Creator:
Ichimaru, S. & Tajima, T.
Object Type:
Report
System:
The UNT Digital Library
An ab initio study of the reaction of atomic hydrogen with sulfur dioxide
Article on an ab initio study of the reaction of atomic hydrogen with sulfur dioxide.
Date:
October 1, 1991
Creator:
Binns, Derk Douglas & Marshall, Paul
Object Type:
Article
System:
The UNT Digital Library
Accelerator and transport line survey and alignment
This paper summarizes the survey and alignment processes of accelerators and transport lines and discusses the propagation of errors associated with these processes. The major geodetic principles governing the survey and alignment measurement space are introduced and their relationship to a lattice coordinate system shown. The paper continues with a broad overview about the activities involved in the step sequence from initial absolute alignment to final smoothing. Emphasis is given to the relative alignment of components, in particular to the importance of incorporating methods to remove residual systematic effects in surveying and alignment operations. Various approaches to smoothing used at major laboratories are discussed. 47 refs., 19 figs., 1 tab.
Date:
October 1, 1991
Creator:
Ruland, R. E.
Object Type:
Article
System:
The UNT Digital Library
Acceptance criteria for the evaluation of Category 1 fuel cycle facility physical security plans
This NUREG document presents criteria developed from US Nuclear Regulatory Commission regulations for the evaluation of physical security plans submitted by Category 1 fuel facility licensees. Category 1 refers to those licensees who use or possess a formula quantity of strategic special nuclear material.
Date:
October 1, 1991
Creator:
Dwyer, P.A.
Object Type:
Report
System:
The UNT Digital Library
Accreditation of ionizing radiation protection programs
There are over one million workers in the United States who have the potential to be exposed to ionizing radiation. Therefore, it is necessary to determine accurately the quantity of radiation to which they may have been exposed. This quantity if measured by personnel dosimeters that are carried by individuals requiring radiation monitoring. Accreditation of the organizations which evaluate this quantity provides official recognition of the competence of these organizations. Accreditation programs in the field of ionizing radiation protection have been in operation for a number of years, and their experience has demonstrated that such programs can help to improve performance.
Date:
October 1, 1991
Creator:
McDonald, J. C.; Swinth, K. L. & Selby, J. M.
Object Type:
Article
System:
The UNT Digital Library
Acoustic Emission/Flaw Relationships for Inservice Monitoring of LWRs
"The program concerning Acoustic Emission/Flaw Relationships for Inservice Monitoring of LWRs was entitled in FY76 with the objective of validating the application of acoustic emission (AE) to monitor nuclear reactor pressure-containing components during operation to detect cracking."
Date:
October 1991
Creator:
Hutton, P. H.; Kurtz, R. J.; Friesel, M. A.; Skorpik, J. R. & Dawson, J. F.
Object Type:
Report
System:
The UNT Digital Library
ACT sup 2 project report: Ventilation and air tightness measurement of the Sunset Building
This report presents the results of ventilation and air tightness measurements made on the test section of the Sunset Building as part of the ACT{sup 2} project. Real-time measurements were made over a two-week period in July 1991 to determine the building's performance; most of the results derive from intensive measurements made during (unoccupied) weekend periods. The ventilation rate of the entire building was measured to be about 2 air changes per hour of outdoor air which exceeds ASHRAE Standard 62-1989 design requirements by over a factor of two. Ventilation in all specific locations was found to be adequate, except for conference rooms -- some of which were significantly under ventilated. Opportunities exist for energy savings with better control of the ventilation. Ventilation efficiency was measured for the test section and selected sub-sections as well. In order to account for interzonal and intrazonal interactions, axillary information was collected and used to adjust the data. The implications of this data may be important for future interpretation of the building's performance.
Date:
October 1, 1991
Creator:
Sherman, M. & Dickerhoff, D.
Object Type:
Report
System:
The UNT Digital Library
ACT{sup 2} project report: Ventilation and air tightness measurement of the Sunset Building
This report presents the results of ventilation and air tightness measurements made on the test section of the Sunset Building as part of the ACT{sup 2} project. Real-time measurements were made over a two-week period in July 1991 to determine the building`s performance; most of the results derive from intensive measurements made during (unoccupied) weekend periods. The ventilation rate of the entire building was measured to be about 2 air changes per hour of outdoor air which exceeds ASHRAE Standard 62-1989 design requirements by over a factor of two. Ventilation in all specific locations was found to be adequate, except for conference rooms -- some of which were significantly under ventilated. Opportunities exist for energy savings with better control of the ventilation. Ventilation efficiency was measured for the test section and selected sub-sections as well. In order to account for interzonal and intrazonal interactions, axillary information was collected and used to adjust the data. The implications of this data may be important for future interpretation of the building`s performance.
Date:
October 1, 1991
Creator:
Sherman, M. & Dickerhoff, D.
Object Type:
Report
System:
The UNT Digital Library
Activation of carbon-hydrogen bonds in alkanes and other organic molecules using organotransition metal complexes
We have recently begun to investigate the interaction of C-H activating iridium and rhodium complexes with functionalized organic molecules, to determine the effect of functional groups on the process, as well as to investigate the propensity of Ir and Rh to insert into C-H versus other types of X-H bonds. Recent experiments have demonstrated that xenon liquefied at -70{degrees}C and 10 atm pressure serves as an inert solvent for the C-H oxidative addition reaction. We have been able to prepare and isolate, for the first time, C-H oxidative addition products formed from high-melting solid substrates such as naphthalene, adamantane, and even cubane; the latter case represents the first observation of C-H oxidative addition at a tertiary C-H bond. Liquid xenon has also allowed us to carry out more conveniently the C-H oxidative addition reactions of low-boiling gases that are difficult to liquefy, such as methane. Recently we have also been able to carry out analogous studies in the gas phase. Under these conditions, naked'' rather than solvated Cp*Rh(CO) is formed, and this species reacts with cyclohexane at nearly gas-kinetic rates. Under the conditions, collision between Cp*Rh(CO) and cyclohexane is the slowest step in the overall C-H activation process. In contrast, …
Date:
October 1, 1991
Creator:
Bergman, R.G.
Object Type:
Article
System:
The UNT Digital Library
Activation of carbon-hydrogen bonds in alkanes and other organic molecules using organotransition metal complexes
We have recently begun to investigate the interaction of C-H activating iridium and rhodium complexes with functionalized organic molecules, to determine the effect of functional groups on the process, as well as to investigate the propensity of Ir and Rh to insert into C-H versus other types of X-H bonds. Recent experiments have demonstrated that xenon liquefied at -70{degrees}C and 10 atm pressure serves as an inert solvent for the C-H oxidative addition reaction. We have been able to prepare and isolate, for the first time, C-H oxidative addition products formed from high-melting solid substrates such as naphthalene, adamantane, and even cubane; the latter case represents the first observation of C-H oxidative addition at a tertiary C-H bond. Liquid xenon has also allowed us to carry out more conveniently the C-H oxidative addition reactions of low-boiling gases that are difficult to liquefy, such as methane. Recently we have also been able to carry out analogous studies in the gas phase. Under these conditions, ``naked`` rather than solvated Cp*Rh(CO) is formed, and this species reacts with cyclohexane at nearly gas-kinetic rates. Under the conditions, collision between Cp*Rh(CO) and cyclohexane is the slowest step in the overall C-H activation process. In contrast, …
Date:
October 1, 1991
Creator:
Bergman, R. G.
Object Type:
Article
System:
The UNT Digital Library