A geometrical multigrid method for solving the linearized matrix equations arising from node-on-face three-dimensional finite element contact is described. The development of an efficient implementation of this combination that minimizes both the memory requirements and the computational cost requires careful construction and storage of the portion of the coarse mesh stiffness matrices that are associated with the contact stiffness on the fine mesh. The multigrid contact algorithm is parallelized in a manner suitable for distributed memory architectures: results are presented that demonstrates the scheme's scalability. The solution of a large contact problem derived from an analysis of the factory joints present in the Space Shuttle reusable solid rocket motor demonstrates the usefulness of the general approach.

Isotopically enriched xenon isotopes are ideal for tracking the flow of relatively large volumes of groundwater. Dissolved noble gas tracers behave conservatively in the saturated zone, pose no health risk to drinking water supplies, and can be used with a large dynamic range. Different Xe isotopes can be used simultaneously at multiple recharge sources in a single experiment. Results from a tracer experiment at a California water district suggests that a small fraction of tracer moved from the recharge ponds through the thick, unconfined, coarse-grained alluvial aquifer to high capacity production wells at a horizontal velocity of 6 m/day. In contrast, mean water residence times indicate that the average rate of transport is 0.5 to 1 m/day.

Thin films of Ti-Cr-Al-O are produced for use as an electrical resistor material. The films are rf sputter deposited from ceramic targets using a reactive working gas mixture of Ar and O{sub 2}. Vertical resistivity values from 10{sup 4} to 10{sup 10} Ohm-cm are measured for Ti-Cr-Al-O films. The film resistivity can be design selected through control of the target composition and the deposition parameters. The Ti-Cr-Al-O thin film resistor is found to be thermally stable unlike other metal-oxide films.

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Adaptive mesh refinement selectively subdivides the elements of a coarse user supplied mesh to produce a fine mesh with reduced discretization error. Effective use of adaptive mesh refinement coupled with an a posteriori error estimator can produce a mesh that solves a problem to a given discretization error using far fewer elements than uniform refinement. A geometric multigrid solver uses increasingly finer discretizations of the same geometry to produce a very fast and numerically scalable solution to a set of linear equations. Adaptive mesh refinement is a natural method for creating the different meshes required by the multigrid solver. This paper describes the implementation of a scalable adaptive multigrid method on a distributed memory parallel computer. Results are presented that demonstrate the parallel performance of the methodology by solving a linear elastic rocket fuel deformation problem on an SGI Origin 3000. Two challenges must be met when implementing adaptive multigrid algorithms on massively parallel computing platforms. First, although the fine mesh for which the solution is desired may be large and scaled to the number of processors, the multigrid algorithm must also operate on much smaller fixed-size data sets on the coarse levels. Second, the mesh must be repartitioned as …

Determine seasonal and interannual patterns of net ecosystem CO2 flux from wet coastal and moist tussock tundra.

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The recognition that a new major HEP facility must receive international support and that its execution would benefit from worldwide interaction from design through operation has given rise to the term Global Accelerator Network (GAN). A welcome consequence has been a more permissive attitude toward remote operation of existing facilities.For roughly thirty years, the computer has been the principal operator interface to the beam,and, through the development of the Internet, the operator can be literally anywhere. In this note, the authors describe their approach to enabling a sufficient degree of operation of the photoinjector from afar in order to carry out investigations in beam physics. The goal was to do so on a time scale of a few months and at minimal cost. At this writing, remote shifts are routinely scheduled involving DESY and LBL, limited in frequency only by the requests of the collaborators and by the need for time to interpret the data.

This report describes the present status of the five low-energy Linac 200-MHz RF stations with regard to availability and reliability of major components. An attempt has been made to describe possible solutions (or non-solutions) and to indicate some of the complexity and interplay between those solutions. For the problem at hand, the discontinuance of this one particular tube, an acceptable solution plan must be identified and designed in detail in the near future. As explained herein, the time scale for implementing a solution is five years; beyond that time there is considerable risk of finding ourselves with a non-maintainable Linac and no High Energy Physics program at Fermilab.

The structural transformations that occur in diamondlike carbon coatings with increasing hydrogen content have been investigated by Raman spectroscopy, transmission electron microscopy, electron diffraction, and electron-energy-loss spectroscopy. Friction tests were performed with uncoated steel balls against coated substrates at contact stresses of 1 GPa in ambient air (relative humidity = 30 - 40%), dry air (relative humidity < 1%), and dry nitrogen (< 1%). The lowest friction coefficient (f < 0.02) was obtained for the most hydrogenated sample in dry nitrogen, where the formation of a third-body layer was observed on the steel surface. Raman spectra obtained from the counterfaces after sliding in humid and dry air revealed a remarkable increase and narrowing of the ''D'' and ''G'' peaks with decreasing humidity. Analysis of peak positions and I(D)/I(G) ratios pointed to an increasing order and an enlargement of the sp{sup 2} clusters under friction. The shape and position of the carbon K-edge spectra for the transfer layer are affected the same way, although evidence of extended graphite layer formation was not observed. Development of these differing trends was correlated with the hydrogen-to-carbon ratio of the gas precursor used during the synthesis and with the type of surrounding atmosphere.

Testimony issued by the General Accounting Office with an abstract that begins "E-government refers to operations that enhance delivery of government information and services. Enterprise architectures provides for successful delivery of e-government applications, which in turn promise improved government performance and accountability. Under the Office of Management and Budget's (OMB) leadership, the president's fiscal year 2003 budget proposes 24 e-government initiatives, most involving multiple agencies. These initiatives have laudable goals, including the elimination of redundant, nonintegrated business operations and systems which could save billions of dollars. The success of these initiatives depends in large part on whether they are pursued within the context of enterprise architectures. Approved architectures for most of these initiatives do not currently exist. OMB has been a proponent of enterprise architectures and has recently devoted increased attention to them. However, it can and should play a larger role. The maturity framework and benchmark data about 116 departments, component agencies, and independent agencies GAO reviews in this testimony provide important baseline information against which targeted improvement across the government can be defined and measured."

Testimony issued by the General Accounting Office with an abstract that begins "As more and more of the baby boomers enter retirement age, spending for Medicare, Medicaid, and Social Security is expected to absorb correspondingly larger shares of federal revenue and crowd out other spending. The aging of the baby boomers will also increase the demand for long-term care and contribute to federal and state budget burdens. The number of disabled elderly who cannot perform daily living activities without assistance is expected to double in the future. Long-term care spending from public and private sources--about $137 billion for persons of all ages in 2000--will rise dramatically as the baby boomers age. Without fundamental financing changes, Medicaid--which pays more than one-third of long-term care expenditures for the elderly--can be expected to remain one of the largest funding sources, straining both federal and state governments."

Testimony issued by the General Accounting Office with an abstract that begins "This testimony comments on legislation that would elevate the Environmental Protection Agency (EPA) to Cabinet status. Today, EPA's mission, size, and scope of responsibilities place it on a par with many Cabinet departments. The United States is the only major industrial power without a Cabinet-level environmental organization. It is important to consider that (1) environmental policy be given appropriate weight as it cuts across the domestic and foreign policies that other Cabinet departments implement and enforce and (2) the head of the agency is able to deal as an equal with his or her counterparts within the federal government as well as the international community. Conferring Cabinet status on EPA would not in itself change the federal environmental role or policies, but it would clearly have an important symbolic effect. Regardless of its status, however, EPA must respond more effectively to its fundamental management challenges. These challenges include (1) placing the right people with the appropriate skills where they are needed and (2) gaining access to high-quality environmental, natural, and social data on which to base environmental decisions. EPA must have the flexibility to use innovative approaches to …

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In the 108th Congress, debate over energy efficiency programs has focused on budget, oil, natural gas, and electricity issues, and provisions in the omnibus energy policy bill, S. 2095, H.R. 6, and S. 14/S. 1149. The Bush Administration’s FY2005 budget request for the Department of Energy’s (DOE’s) Energy Efficiency Program sought $875.9 million, including $543.9 for R&D and $332.0 million for grants. In the first session, the omnibus energy bill (H.R. 6) had several significant tax and regulatory measures for energy efficiency. It did not pass the Senate due to concerns about cost and an MTBE “safe harbor” provision.

This is one report in the series of reports that discuss the campaign finance practices and related issues. Concerns over financing federal elections have become a seemingly perennial aspect of our political system, centered on the enduring issues of high campaign costs and reliance on interest groups for needed campaign funds. The report talks about the today’s paramount issues such as perceived loopholes in current law and the longstanding issues: overall costs, funding sources, and competition.

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