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326
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297
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The MAFIA approach to solving Maxwell's equations in three dimensions
The acronym MAFIA stands for the solution of Maxwell's equations by the Finite Integration Algorithm and is the name give to a set of codes intended for use in the computer-aided design of three-dimensional magnets, rf structures, and structures in which wake-field effects are important. This paper gives a brief description of the algorithms employed in both the time- and the frequency- domain solvers of the MAFIA collection of codes. Examples of typical accelerator calculations will be presented. 9 refs., 6 figs.
Date:
January 1, 1988
Creator:
Cooper, R. K.; Browman, M. J. & Weiland, T.
Object Type:
Article
System:
The UNT Digital Library
Mafic and Ultramafic Xenoliths from Volcanic Rocks of the Western United States
From abstract: Mafic and ultramafic xenoliths in the Western United States are present in volcanic rocks ranging from lamprophyric to dacitic in composition and are found in every major tectonic province from the Coast ranges from California to the Great Plains. Xenoliths from 68 localities are described here, but new localities are being discovered, and much remain to be learned about their distribution with respect to the tectonic and geophysical framework of the Western United States.
Date:
1988
Creator:
Wilshire, Howard Gordon; Meyer, C. E.; Nakata, John K.; Calk, L. C.; Shervais, John W.; Nielson, J. E. et al.
Object Type:
Report
System:
The UNT Digital Library
Magnetic correlations in UPt/sub 3/ and U/sub 1-x/Th/sub x/Pt/sub 3/
Neutron scattering experiments on UPt/sub 3/ and U/sub 1-x/Th/sub x/Pt/sub 3/ are reviewed. At relatively high energies (/approximately/5 MeV), the magnetic fluctuation spectrum is modulated by the structure factor derived from short-range antiferromagnetic correlations where the two U ions in each unit cell are oppositely polarized. In contrast, at low energies (less than or equal to 1 MeV), the diffuse inelastic scattering is associated with antiferromagnetic correlations where the unit cell is doubled. Nominally pure UPt/sub 3/ exhibits magnetic order with the wavevector corresponding to this doubling and a static moment of 0.02 +- 0.01 ..mu../sub B/. (U/sub 1-x/Th/sub x/)Pt/sub 3/ with x approx. = 0.05 exhibits ordering of the same type, but with a much larger static moment, 0.65 +- 0.1 ..mu../sub B/. Neutron scattering measurements on UPt/sub 3/ with implications for superconductivity are surveyed. 23 refs., 7 figs.
Date:
January 1, 1988
Creator:
Aeppli, G.; Bucher, E.; Goldman, A. I.; Shirane, G.; Broholm, C. & Kjems, J. K.
Object Type:
Article
System:
The UNT Digital Library
Magnetic fluctuations and heavy electron superconductivity
A magnetic fluctuation self-energy based on neutron scattering data is used to calculate mass renormalizations, and superconducting critical temperatures and order parameters, for various heavy electron metals.
Date:
January 1, 1988
Creator:
Norman, M.R.
Object Type:
Article
System:
The UNT Digital Library
Magnetic Fusion Energy Plasma Interactive and High Heat Flux Components: Volume 5, Technical assessment of critical issues in the steady state operation of fusion confinement devices
Critical issues for the steady state operation of plasma confinement devices exist in both the physics and technology fields of fusion research. Due to the wide range and number of these issues, this technical assessment has focused on the crucial issues associated with the plasma physics and the plasma interactive components. The document provides information on the problem areas that affect the design and operation of a steady state ETR or ITER type confinement device. It discusses both tokamaks and alternative concepts, and provides a survey of existing and planned confinement machines and laboratory facilities that can address the identified issues. A universal definition of steady state operation is difficult to obtain. From a physics point of view, steady state is generally achieved when the time derivatives approach zero and the operation time greatly exceeds the characteristic time constants of the device. Steady state operation for materials depends on whether thermal stress, creep, fatigue, radiation damage, or power removal are being discussed. For erosion issues, the fluence and availability of the machine for continuous operation are important, assuming that transient events such as disruptions do not limit the component lifetimes. The panel suggests, in general terms, that steady state requires …
Date:
January 1, 1988
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Magnetic measurements on insertion devices at NSLS
Magnetic measurements on three insertion devices for use in the NSLS x-ray ring are described. Hall probes were used for field mapping, and rotating long coils were used to determine integrated multipole coefficients. Results are presented for an iron pole-REC hybrid undulator, a vanadium permendur pole-REC wiggler and a 5 Tesla superconducting wiggler. 6 refs., 8 figs., 2 tabs.
Date:
January 1, 1988
Creator:
Decker, G.; Galayda, J.; Kitamura, M. & Solomon, L.
Object Type:
Article
System:
The UNT Digital Library
Magnetic shielding by superconducting Y-Ba-Cu-O hollow cylinders
We have measured the magnetic field H' at the center of a hollow tube of sintered Y-Ba-Cu-O superconductor as a function of applied field H, temperature, tube length, and tube wall thickness. The maximum field that can be shielded H/sub sh/ agrees with the value calculated from the critical state model using the measured critical current density J/sub c/. The maximum trapped field H/sub tr/ in the tube upon decreasing H to zero exceeds H/sub sh/ by as much as a factor of two, and large enhancements in J/sub c/ are observed in decreasing field. These phenomena are identified with intragranular flux pinning present only after H has exceeded H/sub c1/ of the grains. Finite tube length does not affect the H/sub tr//H/sub sh/ ratio appreciably. H/sub sh/ depends approximately on the square root of the wall thickness. 7 refs., 4 figs.
Date:
January 1, 1988
Creator:
Willis, J. O.; McHenry, M. E.; Maley, M. P. & Sheinberg, H.
Object Type:
Article
System:
The UNT Digital Library
Main Street
Photograph of an aerial view of Main Street, looking west from Greenville Avenue. There are two cars at an intersection. Several other cars are parked beside buildings. The photograph was taken from a fire truck ladder.
Date:
1988
Creator:
unknown
Object Type:
Photograph
System:
The Portal to Texas History
Main Street
Photograph of an aerial view of Main Street, looking west from Greenville Avenue. There are cars at an intersection. Several cars are parked amongst buildings. The photograph was taken from a fire truck ladder.
Date:
1988
Creator:
unknown
Object Type:
Photograph
System:
The Portal to Texas History
Main Street
Photograph of an aerial view of Main Street, looking west from Greenville Avenue. Cars are driving along the road, and parked amongst buildings. In the background, there is a view of two water towers; the multi-story building on the right is identified as First City Bank. The photograph was taken from a fire truck ladder.
Date:
1988
Creator:
unknown
Object Type:
Photograph
System:
The Portal to Texas History
Main Street
Photograph of an aerial view of Main Street, looking east from Greenville Avenue. Cars are driving along the road. Buildings and trees are on both sides of the street; one building on the right is identified as Braum's.
Date:
1988
Creator:
unknown
Object Type:
Photograph
System:
The Portal to Texas History
Main Street
Photograph of an aerial view of Main Street, looking west from the Greenville Avenue. There are cars driving on the road; parked cars and buildings are on each side of the road. In the background, there is a view of two water towers and a multi-story building identified as First City Bank. This photograph was taken from a fire truck ladder.
Date:
1988
Creator:
unknown
Object Type:
Photograph
System:
The Portal to Texas History
Main Street
Photograph of an aerial view of Main Street, looking from Greenville Avenue. There are cars on the road at an intersection. Cars are parked amongst buildings on both sides of the perpendicular road. In the background, there are two water towers. This photograph was taken from a fire truck ladder.
Date:
1988
Creator:
unknown
Object Type:
Photograph
System:
The Portal to Texas History
Main Street
Photograph of an aerial view of Main Street, looking west from Greenville Avenue. Cars are driving on two perpendicular roads. Cars are parked amongst buildings on both sides of the streets. In the background, there is a view of two water towers. This photograph was taken from a fire truck ladder.
Date:
1988
Creator:
unknown
Object Type:
Photograph
System:
The Portal to Texas History
Main Street
Photograph of an aerial view of Main Street, looking west from Greenville Avenue. Cars are driving down the road; parked cars and buildings are on both sides of the road. In the background, there are two water towers, and a multi-story building on the right, identified as First City Bank.
Date:
1988
Creator:
unknown
Object Type:
Photograph
System:
The Portal to Texas History
Main Street
Photograph of an aerial view of Main Street, looking east from Greenville Avenue. Two cars are driving on the road. On the right side of the road, two businesses are identified as Black & Decker and Baskin Robbins. In the background, there are trees and buildings.
Date:
1988
Creator:
unknown
Object Type:
Photograph
System:
The Portal to Texas History
Main Street (Belt Line Rd) and Central Expressway (US Hwy 75) Intersection, 1988, Richardson, Texas
Intersection of multi-lane, partially divided street with expressway access road. Motor vehicles are shown parked in a parking lot with angled parking. To the right/east is a strip of retail businesses. On the left/west is the northbound access road to an elevated portion of North Central Expressway. West Main Street extends under the Expressway. On the center horizon is a multi-story building (FirstCity Bank) with horizontal rows of windows. Right/east of that building the top of a water tower is just visible above trees. Three flags on poles are on the north side of West Main, at the edge of the bank parking lot. Motor vehicles are visible on all streets. Signs on buildings: FirstCity Bank, Barton & Howell Dry Cleaners, The Shoemaker Shoe Service, Ali's Master[?] Alterations, Custom Cloth[?]. Signs on poles: Pizza Villa, Central Center / Dry Cleaning, Laundry & Cleaning. Also: Street lights on poles, traffic signs and signals. Additional Information: Shown is the 300 block of West Main St. (which is Belt Line Rd east and west of the downtown area).
Date:
1988
Creator:
unknown
Object Type:
Photograph
System:
The Portal to Texas History
Maintenance concept development for the Compact Ignition Tokamak
The Compact Ignition Tokamak (CIT), located at the Princeton Plasma Physics Laboratory, will be the next major experimental machine in the US Fusion Program. Its use of deuterium-tritium (D-T) fuel requires the use of remote handling technology to carry out maintenance operations on the machine. These operations consist of removing and repairing such components as diagnostic equipment modules by using remotely operated maintenance equipment. The major equipment being developed for maintenance external to the vacuum vessel includes both bridge-mounted and floor-mounted manipulator systems. Additionally, decontamination (decon) equipment, hot cell repair facilities, and equipment for handling and packaging solid radioactive waste (rad-waste) are being developed. Recent design activities have focused on establishing maintenance system interfaces with the facility design, developing manipulator system requirements, and using mock-ups to support the tokamak configuration design. 3 refs., 8 figs.
Date:
January 1, 1988
Creator:
Macdonald, D.
Object Type:
Article
System:
The UNT Digital Library
[Maintenance Worker]
Photograph of a worker performing maintenance on the wheels of an airplane.
Date:
1988~/1990~
Creator:
unknown
Object Type:
Photograph
System:
The Portal to Texas History
[Man and Bus Jefferson Blvd Panoramic, 1988]
A panoramic photograph of a man facing towards the tiled exterior of a building. He holds a rag in his left hand and stands on the corner of a sidewalk. A bus is parked in front of a street sign to his right. [1988, Dallas, TX]
Date:
1988
Creator:
Doherty, Richard
Object Type:
Photograph
System:
The UNT Digital Library
[Man and Children in Gallery]
Photograph of an unidentified man standing in front of a several black and white photographs hanging on a wall with a group of children sitting on the floor and watching him; there are paintings and other artworks visible in the background.
Date:
[1988..]
Creator:
Mexic-Arte Museum (Austin, Tex.)
Object Type:
Photograph
System:
The Portal to Texas History
[Man and Wheels Jefferson Blvd Panoramic, 1988]
A panoramic photograph of a man in a leather jacket walking down a sidewalk to the right of a tire rim display. He holds a pair of sunglasses in his right hand and squints at the camera. There is a wide brick building to his left with the phrase "Jefferson Farmers Market" painted on it. Cars drive down a street to the right of the building. [1988, Dallas, TX]
Date:
1988
Creator:
Doherty, Richard
Object Type:
Photograph
System:
The UNT Digital Library
[Man Cleaning Decal]
Photograph of a man cleaning a decal that reads "RAM '88, 67 TRW, Ghost Riders" on the side of a plane.
Date:
1988~
Creator:
unknown
Object Type:
Photograph
System:
The Portal to Texas History
[Man Holding fundraising Objects at Names Project Tour]
Photograph of a man holding several fundraising post at the Names project tour in Dallas, Texas.
Date:
1988
Creator:
unknown
Object Type:
Photograph
System:
The UNT Digital Library