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Negative transverse impedance

Description: Recently, measurements in the SPS show that the coherent tune shift in the horizontal direction has positive values whereas that in the vertical direction has negative ones. Thus the existence of negative transverse impedance gets confirmed in a real machine. This stimulates us to start a new round of systematic studies on this interesting phenomenon. The results obtained from our computer simulations are presented in this note. Our simulations demonstrate that the negative transverse impedance may appear when the rotational symmetry embedded in a discontinuity is broken, and that the geometries that we have studies may be the source of the positive horizontal tune shift measured in the SPS.
Date: June 12, 1989
Creator: Chou, W.
Partner: UNT Libraries Government Documents Department

Mary Potishman Lard Trust Agency

Description: A financial data report on the Mary Potishman Lard Trust Agency. The financial report defines their assets from the 1984 year to the 1988 year along with the grant they have awarded for that year.
Date: July 12, 1989
Partner: UNT Libraries Special Collections

Helen Gertrude Sparks Charitable Trust

Description: A financial data report on the Helen Gertrude Sparks Charitable Trust. The financial report lists the foundations assets by year starting from 1984 to 1988 and list the supporting grants they have awarded for the years as well. In the additional information, no deadlines, has been circled.
Date: July 12, 1989
Partner: UNT Libraries Special Collections

Technical evaluation report of the Fort St. Vrain final draft upgraded technical specifications

Description: This report is a technical evaluation of the final draft of the Fort St. Vrain (FSV) Upgraded Technical Specifications (UT/S) as issued by Public Service of Colorado (PSC) on May 27, 1988 with subsequent supplemental updates issued on June 15, 1988 and August 5, 1988. It has been compared for consistency, and safety conservatism with the Fort St. Vrain (FSV) Updated Final Safety Analysis Report (FSAR), the FSV Safety Evaluation Report (SER), the Facility Operating License, DPR-34, and all amendments to the Facility Operating License issued as of June 1, 1988, and Appendix A to the Operating License DPR-34, Technical Specifications. Because of the age of the plant, no supplements to the Fort St. Vrain SER have been issued since the original SER was not issued as a WASH or a NUREG report. This made it necessary to review all amendments to the Facility Operating License since they would contain the safety evaluations done to support changes to the Facility Operating License. The upgraded Fort St. Vrain Technical Specifications were also broadly compared with the latest Westinghouse Standard Technical Specifications (WSTS) to assure that what was proposed for Fort St. Vrain was consistent with the latest NRC staff practices for standard technical specifications.
Date: July 12, 1989
Creator: Kimura, C.Y.
Partner: UNT Libraries Government Documents Department

Photoinitiated electron transfer in multichromophoric species: Synthetic tetrads and pentads

Description: This research project involves the design, synthesis and study of molecules which mimic many of the important aspects of photosynthetic electron and energy transfer. Specifically, the molecules are designed to mimic the following aspects of natural photosynthetic multistep electron transfer: electron donation from a tetrapyrrole excited singlet state, electron transfer between tetrapyrroles, electron transfer from tetrapyrroles to quinones, and electron transfer between quinones with different redox properties. In addition, they model carotenoid antenna function in photosynthesis (singlet-singlet energy transfer from carotenoid polyenes to chlorophyll) and carotenoid photoprotection from singlet oxygen damage (triplet-triplet energy transfer from chlorophyll to carotenoids).
Date: April 12, 1989
Partner: UNT Libraries Government Documents Department

Linear beam-beam tune shift calculations for the Tevatron Collider

Description: A realistic estimate of the linear beam-beam tune shift is necessary for the selection of an optimum working point in the tune diagram. Estimates of the beam-beam tune shift using the ''Round Beam Approximation'' (RBA) have over estimated the tune shift for the Tevatron. For a hadron machine with unequal lattice functions and beam sizes, an explicit calculation using the beam size at the crossings is required. Calculations for various Tevatron lattices used in Collider operation are presented. Comparisons between the RBA and the explicit calculation, for elliptical beams, are presented. This paper discusses the calculation of the linear tune shift using the program SYNCH. Selection of a working point is discussed. The magnitude of the tune shift is influenced by the choice of crossing points in the lattice as determined by the pbar ''cogging effects''. Also discussed is current cogging procedures and presents results of calculations for tune shifts at various crossing points in the lattice. Finally, a comparison of early pbar tune measurements with the present linear tune shift calculations is presented. 17 refs., 13 figs., 3 tabs.
Date: January 12, 1989
Creator: Johnson, D.
Partner: UNT Libraries Government Documents Department

[UNT UPDATE, Vol. 19 No. 17, June 12, 1989]

Description: A UNT UPDATE publication by Scott Andreas covering the new grant from the Getty Center for Education in the Arts to UNT for the NTIEVA project. Also included is a message about Dr. Bernard L. Weinstein and Dr. Harold T. Gross becoming the heads of the new Economic Research Center.
Date: June 12, 1989
Creator: Acott Andreas
Partner: UNT Libraries Special Collections

Nondestructive x-ray microanalysis bidirectional scanning and data acquisition system

Description: A system for making fast scans of specimens and acquiring data was developed at the oak Ridge Y-12 Plant. An LSI 11/23 computer using the RT11 operating system controls the scan and data acquisition. Scan software was written which would program a Unidex III stepping motor controller to make the scan motions while the position was monitored and the data acquired through the computer`s timer/counter boards from the multichannel analyzer`s four region of interest (ROI) outputs. Small areas of a part or specimen are scanned by moving the part back and forth in the x-ray beam using stepping motor actuated tables. A detector receives the scattered x-rays from the part and sends a signal to the multichannel analyzer which digitizes it. After the data has been acquired using the scan computer, the data is then transferred to a PC to where it is processed and an image is generated and displayed for analysis.
Date: September 12, 1989
Creator: Lawson, R. L.
Partner: UNT Libraries Government Documents Department

Photoinitiated electron transfer in multichromophoric species: Synthetic tetrads and pentads. Technical progress report, 1989

Description: This research project involves the design, synthesis and study of molecules which mimic many of the important aspects of photosynthetic electron and energy transfer. Specifically, the molecules are designed to mimic the following aspects of natural photosynthetic multistep electron transfer: electron donation from a tetrapyrrole excited singlet state, electron transfer between tetrapyrroles, electron transfer from tetrapyrroles to quinones, and electron transfer between quinones with different redox properties. In addition, they model carotenoid antenna function in photosynthesis (singlet-singlet energy transfer from carotenoid polyenes to chlorophyll) and carotenoid photoprotection from singlet oxygen damage (triplet-triplet energy transfer from chlorophyll to carotenoids).
Date: April 12, 1989
Partner: UNT Libraries Government Documents Department