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10
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Country
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Year
Month
Day
Language
Beam-Loss Driven Design Optimization for the Spallation Neutron Source (SNS) Ring.
This paper summarizes three-stage design optimization for the Spallation Neutron Source (SNS) ring: linear machine design (lattice, aperture, injection, magnet field errors and misalignment), beam core manipulation (painting, space charge, instabilities, RF requirements), and beam halo consideration (collimation, envelope variation, e-p issues etc.).
Date:
March 29, 1999
Creator:
Wei, J.; Beebe-Wang, J.; Blaskiewicz, M.; Cameron, P.; Danby, G.; Gardner, C. J. et al.
Object Type:
Article
System:
The UNT Digital Library
Beam Manipulation With an RF Dipole.
Coherent betatron motion adiabatically excited by an RF dipole has been successfully employed to overcome strong intrinsic spin depolarization resonances in the AGS, while a solenoid partial snake has been used to correct imperfection spin resonances. The experimental results showed that a full spin flip was obtained in passing through an intrinsic spin resonance when all the beam particles were forced to oscillate coherently at a large amplitude without diluting the beam emittance. With this method, we have successfully accelerated polarized beam up to 23.5 GeV/c. A new type of second order spin resonances was also discovered. As a non-destructive manipulation, this method can also be used for nonlinear beam dynamics studies and beam diagnosis such as measuring phase advance and betatron amplitude function.
Date:
March 29, 1999
Creator:
Bai, M.
Object Type:
Article
System:
The UNT Digital Library
A Best Approximation Evaluation of a Finite Element Calculation
We discuss an electrostatics problem whose solution must lie in the set S of all real n-by-n symmetric matrices with all row sums equal to zero. With respect to the Frobenius norm, we provide an algorithm that finds the member of S which is closest to any given n-by-n matrix, and determines the distance between the two. This algorithm makes it practical to find the distances to S of finite element approximate solutions of the electrostatics problem, and to reject those which are not sufficiently close.
Date:
September 29, 1999
Creator:
ROBINSON, ALLEN C. & ROBINSON, DONALD W.
Object Type:
Article
System:
The UNT Digital Library
Bias-voltage-controlled interlayer exchange coupling.
We propose a new system whose magnetization direction can be controlled by an applied bias voltage without an external magnetic field. The system consists of a four layered structure F{sub 1}/S/I/F{sub 2} (F{sub 1}, F{sub 2}: ferromagnets, S: spacer, I: insulator). An analytic expression for bias-voltage-controlled interlayer exchange coupling in this system is developed within a simple free-electron-like, one-dimensional approximation. According to the approach, the magnetic configurations of the two magnetic layers oscillate from antiferromagnetic to ferromagnetic with applied bias voltage. This implies that we can switch/rotate the magnetization direction without an external magnetic field. Possible applications of such a system are also discussed.
Date:
March 29, 1999
Creator:
You, C.-Y.
Object Type:
Article
System:
The UNT Digital Library
Bibliography of Work on the Heterogeneous Photocatalytic Removal of Hazardous Compounds from Water
The subject of this report is chemistry and engineering for the application of heterogeneous photocatalysts. The state of the art in catalysts are forms of titanium dioxide or modifications thereof, but work on other heterogeneous catalysts is included.
Date:
July 29, 1999
Creator:
Blake, D. M.
Object Type:
Report
System:
The UNT Digital Library
Biomass Crop Production: Benefits for Soil Quality and Carbon Sequestration
Research at three locations in the southeastern US is quantifying changes in soil quality and soil carbon storage that occur during production of biomass crops compared with row crops. After three growing seasons, soil quality improved and soil carbon storage increased on plots planted to cottonwood, sycamore, sweetgum with a cover crop, switchgrass, and no-till corn. For tree crops, sequestered belowground carbon was found mainly in stumps and large roots. At the TN site, the coarse woody organic matter storage belowground was 1.3 Mg ha{sup {minus}1}yr{sup {minus}1}, of which 79% was stumps and large roots and 21% fine roots. Switchgrass at the AL site also stored considerable carbon belowground as coarse roots. Most of the carbon storage occurred mainly in the upper 30 cw although coarse roots were found to depths of greater than 60 cm. Biomass crops contributed to improvements in soil physical quality as well as increasing belowground carbon sequestration. The distribution and extent of carbon sequestration depends on the growth characteristics and age of the individual biomass crop species. Time and increasing crop maturity will determine the potential of these biomass crops to significantly contribute to the overall national goal of increasing carbon sequestration and reducing greenhouse …
Date:
August 29, 1999
Creator:
Bandaranayake, W.; Bock, B. R.; Houston, A.; Joslin, J. D.; Pettry, D. E.; Schoenholtz, S. et al.
Object Type:
Article
System:
The UNT Digital Library
BIOMASS REBURNING - MODELING/ENGINEERING STUDIES
This project is designed to develop engineering and modeling tools for a family of NO{sub x}control technologies utilizing biomass as a reburning fuel. During the eighth reporting period (July 1--September 26, 1999), Antares Group Inc, under contract to Niagara Mohawk Power Corporation, evaluated the economic feasibility of biomass reburning options for Dunkirk Station. This report includes summary of the findings; complete information will be submitted in the next Quarterly Report.
Date:
October 29, 1999
Creator:
Zamansky, Vladimir & Lindsey, Chris
Object Type:
Report
System:
The UNT Digital Library
BIOMASS REBURNING - MODELING/ENGINEERING STUDIES
This project is designed to develop engineering and modeling tools for a family of NO{sub x} control technologies utilizing biomass as a reburning fuel. The sixth reporting period (January 1--March 31, 1999) included CFD modeling and assessment of available experimental and modeling data on biomass reburning. Experimental and modeling data obtained within scope of this and Phase II SBIR USDA projects were reviewed and analyzed. This work was necessary to summarize available data and to make decision about additional efforts that are necessary for successful completion of the DOE FETC project. These efforts resulted in preparation of the paper entitled ''Kinetic Study of Biomass Reburning'' which was presented at the 1999 Joint Meeting of the United States Sections of the Combustion Institute. The paper is included in Attachment A.
Date:
April 29, 1999
Creator:
Lissianski, Vitali V. & Zamansky, Vladimir M.
Object Type:
Report
System:
The UNT Digital Library
BNL-Built LHC Magnet Error Impact Analysis and Compensation.
Superconducting magnets built at the Brookhaven National Laboratory will be installed in both the Insertion Region IP2 and IP8, and the RF Region of the Large Hadron Collider (LHC). In particular, field quality of these IR dipoles will become important during LHC heavy-ion operation when the {beta}* at IP2 is reduced to 0.5 meters. This paper studies the impact of the magnetic errors in BNL-built magnets on LHC performance at injection and collision, both for proton and heavy-ion operation. Methods and schemes for error compensation are considered including optimization of magnet orientation and compensation using local IR correctors.
Date:
March 29, 1999
Creator:
Ptitsin, V.; Tepikian, S. & Wei, J.
Object Type:
Article
System:
The UNT Digital Library
The Boerne Star (Boerne, Tex.), Vol. 94, No. 9, Ed. 1 Friday, January 29, 1999
Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
January 29, 1999
Creator:
Chionsini, Brandi
Object Type:
Newspaper
System:
The Portal to Texas History
The Boerne Star (Boerne, Tex.), Vol. 94, No. 52, Ed. 1 Tuesday, June 29, 1999
Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
June 29, 1999
Creator:
Keasling, Edna & Fierro, Jennifer
Object Type:
Newspaper
System:
The Portal to Texas History
The Boerne Star (Boerne, Tex.), Vol. 94, No. 87, Ed. 1 Friday, October 29, 1999
Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
October 29, 1999
Creator:
Keasling, Edna & Fierro, Jennifer
Object Type:
Newspaper
System:
The Portal to Texas History
Bogata News (Bogata, Tex.), Vol. 88, No. 51, Ed. 1 Thursday, April 29, 1999
Weekly newspaper from Bogata, Texas that includes local, state, and national news along with advertising.
Date:
April 29, 1999
Creator:
Nichols, Nanalee & Nichols, Thomas
Object Type:
Newspaper
System:
The Portal to Texas History
Bogata News (Bogata, Tex.), Vol. 89, No. 12, Ed. 1 Thursday, July 29, 1999
Weekly newspaper from Bogata, Texas that includes local, state, and national news along with advertising.
Date:
July 29, 1999
Creator:
Nichols, Nanalee & Nichols, Thomas
Object Type:
Newspaper
System:
The Portal to Texas History
The Booster Application Facility (Baf) Beam Transport Line of Bnl-Ags Booster.
An experimental facility, to irradiate materials with energetic ion beams, has been proposed to be built at the Brookhaven National Laboratory. The BAF facility will mainly consist of the AGS-Booster slow extraction, of a beam transport line, and a target room. The beam transport line will transport the slow extracted beam of the AGS-Booster to the target location for the irradiation of various materials and specimens. A variety of ion beams like (p, {sup 28}Si, {sup 56}Fe, {sup 63}Cu, {sup 197}Au) in the energy range of 0.04 to 3.07 GeV/nucleon will be transported by the BAF line which is designed to provide variable beam spot sizes on the BAF target with sizes varying from 2.0 cm to 20.0 cm in diameter. The beam spot sizes will include 95% of the beam intensity with the beam distributed normally (Gaussian) on the target area. It is also possible by introducing magnetic octupoles at specified locations along the beam transport line, to modify the distribution on the BAF target and provide well confined beams with rectangular cross section and with uniform distribution on the target.
Date:
March 29, 1999
Creator:
Tsoupas, N.; Brown, K. A.; Cullen, J. R.; Lee, Y. Y.; Mcnerney, A. J.; Pile, P. H. et al.
Object Type:
Article
System:
The UNT Digital Library
Broadly Turnable Pump-Resonant Diode-Pumped CW PPLN OPO
We have observed low threshold operation of a broadly tunable (2.18-3.4 µm) pump-resonant cw periodically poled lithium niobate (PPLN) optical parametric oscillator (OPO). When pumped at 806 nm with 410 mW from a custom-built diode laser the OPO generated 20 mW of idler output at 3.3 µm.
Date:
April 29, 1999
Creator:
Alford, W.J.; Bowers, Mark S.; Raymond, T.D. & Seamans, J.F.
Object Type:
Article
System:
The UNT Digital Library
The Canadian Record (Canadian, Tex.), Vol. 109, No. 30, Ed. 1 Thursday, July 29, 1999
Weekly newspaper from Canadian, Texas that includes local, state and national news along with extensive advertising.
Date:
July 29, 1999
Creator:
Ezzell, Nancy & Brown, Laurie Ezzell
Object Type:
Newspaper
System:
The Portal to Texas History
The Canadian Record (Canadian, Tex.), Vol. 109, No. 68, Ed. 1 Thursday, April 29, 1999
Weekly newspaper from Canadian, Texas that includes local, state and national news along with extensive advertising.
Date:
April 29, 1999
Creator:
Ezzell, Nancy & Brown, Laurie Ezzell
Object Type:
Newspaper
System:
The Portal to Texas History
Career Appointments of Political Appointees
Correspondence issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO clarified when it is appropriate for a political appointee to receive a career position in the federal government."
Date:
September 29, 1999
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
[Castle Ruins]
Photograph of castle ruins (possibly at the Rock of Cashel) showing a stone structure with crumbled walls green grass in the foreground.
Date:
March 29, 1999
Creator:
unknown
Object Type:
Photograph
System:
The Portal to Texas History
[Castyle Graveyard]
Photograph of a cemetery (possibly at the Rock of Cashel) with several headstones, including a Celtic cross on the right), and a small tower-like structure in the middle.
Date:
March 29, 1999
Creator:
unknown
Object Type:
Photograph
System:
The Portal to Texas History
Challenges using a {sup 252}Cf shuffler instrument in a plant environment to measure mixtures of uranium and plutonium transuranic waste
An active-passive {sup 252}Cf shuffler instrument, installed and certified several years ago at Los Alamos National Laboratory's plutonium facility, has now been calibrated for different matrices to measure Waste Isolation Pilot Plant (WIPP)-destined transuranic (TRU) waste. Little or no data currently exist for these types of measurements in plant environments where sudden large changes in the neutron background radiation can significantly distort the results. Measurements and analyses of twenty-two 55-gallon drums, consisting of mixtures of varying quantities of uranium and plutonium in mostly noncombustible matrices, have been recently completed at the plutonium facility. The calibration and measurement techniques, including the method used to separate out the plutonium component, will be presented and discussed. Calculations used to adjust for differences in uranium enrichment from that of the calibration standards will be shown. Methods used to determine various sources of both random and systematic error will be indicated. Particular attention will be directed to those problems identified as arising from the plant environment. The results of studies to quantify the aforementioned distortion effects in the data will be presented. Various solution scenarios will be outlined, along with those adopted here.
Date:
August 29, 1999
Creator:
Hurd, J. R.
Object Type:
Article
System:
The UNT Digital Library
Chamber Motion Measurements at the Nsls X-Ray Ring.
Work has been ongoing at the NSLS to improve the orbit stability of the X-Ray Ring by accounting for the thermal motion of the vacuum chamber, which supports the electron beam position monitors (BPMs). In-situ contact measurements of the vacuum chamber motion have been carried out using support stands that have been designed and extensively tested to reduce errors associated with thermal changes in the stands themselves. Using this chamber motion as a correction to the orbit motion measured by the BPMs, the precise location of the radiation beam can be predicted. These predictions are compared with actual radiation beam measurements on the experimental floor, and with predictions based solely on BPM measurements of the electron beam position. This paper reviews this work including stand design and performance, chamber motion measurements, predictions based on these data, and results.
Date:
March 29, 1999
Creator:
Solomon, L.; Lynch, D.; Safranek, J. & Singh, O.
Object Type:
Article
System:
The UNT Digital Library
CHARACTERIZATION OF MIXED-METAL OXIDES USING SYNCHROTRON-BASED TIME-RESOLVED X-RAY DIFFRACTION AND X-RAY ABSORPTION SPECTROSCOPY.
None
Date:
November 29, 1999
Creator:
RODRIGUEZ,J.A.
Object Type:
Article
System:
The UNT Digital Library