A letter report issued by the Government Accountability Office with an abstract that begins "The Internal Revenue Service's (IRS) tax filing season performance is a key indicator of how well IRS serves taxpayers. This year's filing season was expected to be risky because of tax system changes, including the telephone excise tax refund (TETR). IRS's fiscal year (FY) 2008 budget request shows its spending proposal for taxpayer service, enforcement, and Business Systems Modernization (BSM). The request includes initiatives to reduce the tax gap, the difference between what taxpayers owe and what they voluntarily pay on time. IRS recently estimated the net tax gap to be $290 billion in 2001. GAO was asked to (1) describe IRS's 2007 filing season performance, (2) determine how IRS's proposed FY 2008 budget compares to prior years', provides information on how proposals may impact the tax gap, justifies new spending, and whether there are opportunities to reduce or reallocate resources, and (3) evaluate the status of IRS's efforts to develop and implement BSM."

A letter report issued by the Government Accountability Office with an abstract that begins "Interstate compacts are legal agreements between states that are designed to resolve concerns that transcend state lines, such as allocating interstate waters. While some compacts assign their administration to existing state agencies, compacts requiring greater coordination among states may establish an interstate agency, typically called a commission, to administer their provisions. Congress must give its consent to compacts that affect the balance of power between the states and the federal government. An example of a congressionally approved environment and natural resource compact is the Tahoe Regional Planning Compact, which created the Tahoe Regional Planning Agency (TRPA) to administer its provisions. For such compacts, GAO determined (1) the organizational structures, powers and authorities, and dispute resolution and public accountability mechanisms; (2) the extent to which concerns have been raised about the structure and governance of compacts that have commissions; and (3) how the structure and governance of TRPA compares to those of other similar compact commissions. GAO reviewed 59 congressionally approved compacts and surveyed those 45 that had commissions."

A letter report issued by the Government Accountability Office with an abstract that begins "The Federal Financial Management Improvement Act of 1996 (FFMIA) requires the 24 Chief Financial Officers (CFO) Act agencies to implement and maintain financial management systems that comply substantially with (1) federal financial management systems requirements, (2) federal accounting standards, and (3) the U.S. Government Standard General Ledger (SGL). FFMIA also requires GAO to report annually on the implementation of the act. This report, primarily based on GAO and inspectors general reports, discusses (1) the problems that continued to affect agencies systems' FFMIA compliance in fiscal year 2006 and (2) the initiatives under way to help move federal financial management toward FFMIA compliance."

Correspondence issued by the Government Accountability Office with an abstract that begins "On November 15, 2006, we issued our report on the U.S. Securities and Exchange Commission's (SEC) fiscal years 2006 and 2005 financial statements and on SEC's internal control as of September 30, 2006. We also reported on the results of our tests of SEC's compliance with selected provisions of laws and regulations during fiscal year 2006. The purpose of this report is to discuss issues identified during our fiscal year 2006 audit concerning internal controls and accounting/operational procedures that could be improved. This report contains six recommendations to SEC to improve these internal controls and procedures. These recommendations are in addition to those we already provided to SEC as a result of our prior audits of SEC's financial statements"

A letter report issued by the Government Accountability Office with an abstract that begins "One in 12 Americans participates in the federal Food Stamp Program, administered by the Food and Nutrition Service (FNS). States have begun offering individuals alternatives to visiting the local assistance office to apply for and maintain benefits, such as mail-in procedures, call centers, and on-line services. GAO was asked to examine: (1) what alternative methods states are using to increase program access; (2) what is known about the results of these methods, particularly on program access for target groups, decision accuracy, and administrative costs; and (3) what actions states have taken to maintain program integrity while implementing alternative methods. GAO surveyed state food stamp administrators, reviewed five states in depth, analyzed FNS data and reports, and interviewed program officials and stakeholders."

Testimony issued by the Government Accountability Office with an abstract that begins "In November 2006, about 18,000 undervotes were reported in Sarasota County in the race for Florida's 13th Congressional District. Following the contesting of the election results in the House of Representatives, the Task Force met and unanimously voted to seek GAO's assistance in determining whether the voting systems contributed to the large undervote in Sarasota County. On June 14, 2007, we met with the Task Force and agreed upon an engagement plan, which included the following review objectives: (1) What voting systems and equipment were used in Sarasota County and what processes governed their use? (2) What was the scope of the undervote in Sarasota County in the general election? (3) To what extent were tests conducted on the voting systems in Sarasota County prior to the general election and what were the results of those tests? and (4) Considering the tests that were conducted on the voting systems from Sarasota County after the general election, are additional tests needed to determine whether the voting systems contributed to the undervote? In our meetings with Sarasota County, we learned the entire process of configuring the election, running the election, …

Testimony issued by the Government Accountability Office with an abstract that begins "The Nuclear Regulatory Commission (NRC) is responsible for overseeing the nation's 104 commercial nuclear power reactors to ensure they are operated safely. Since 2000, NRC has used a formal Reactor Oversight Process (ROP) to oversee safety. NRC is also responsible for licensing the construction and operation of new reactors. Electric power companies have announced plans to submit 20 applications in the next 18 months. This testimony is based on GAO reports that reviewed (1) how NRC implements the ROP, (2) the results of the ROP over several years, (3) the status of NRC's efforts to improve the ROP, (4) NRC's efforts to prepare its workforce and manage its workload for new reactor licensing, and (5) NRC's efforts to develop its regulatory framework and review processes for new reactor activities. In conducting this work, GAO analyzed programwide information and interviewed cognizant NRC managers and industry representatives."

Testimony issued by the Government Accountability Office with an abstract that begins "Weather-related events in the United States have caused tens of billions of dollars in damages annually over the past decade. A major portion of these losses is borne by private insurers and by two federal insurance programs-- the Federal Emergency Management Agency's National Flood Insurance Program (NFIP), which insures properties against flooding, and the Department of Agriculture's Federal Crop Insurance Corporation (FCIC), which insures crops against drought or other weather disasters. In this testimony, GAO (1) describes how climate change may affect future weather-related losses, (2) provides information on past insured weather-related losses, and (3) determines what major private insurers and federal insurers are doing to prepare for potential increases in such losses. This testimony is based on a report entitled Climate Change: Financial Risks to Federal and Private Insurers in Coming Decades are Potentially Significant (GAO-07-285) released on April 19, 2007."

Testimony issued by the Government Accountability Office with an abstract that begins "The U.S. Dept. of Agriculture's (USDA) Risk Management Agency (RMA) administers the federal crop insurance program in partnership with private insurers. In 2006, the program cost $3.5 billion, including millions in losses from fraud, waste, and abuse, according to USDA. The Agricultural Risk Protection Act of 2000 granted RMA authority to renegotiate the terms of RMA's standard reinsurance agreement with companies once over 5 years. This testimony is based on GAO's 2005 report, Crop Insurance: Actions Needed to Reduce Program's Vulnerability to Fraud, Waste, and Abuse, as well as new analyses this Committee requested on underwriting gains and administrative and operating expenses USDA paid companies. GAO discusses (1) USDA's processes to address fraud, waste, and abuse; (2) extent the program's design makes it vulnerable to abuse; and (3) reasonableness of underwriting gains and other expenses. USDA agreed with most of GAO's 2005 recommendations to improve program integrity. RMA agreed that GAO's new analyses were technically accurate."

Other written product issued by the Government Accountability Office with an abstract that begins "Economic, medical, technological, and social changes have increased opportunities for persons with disabilities to live with greater independence and more fully participate in the workforce. In addition, social and legal changes have promoted the goal of greater inclusion of persons with disabilities in the mainstream of society. However, GAO's reviews of the largest federal disability programs indicate that such programs have not evolved in line with these larger societal changes and, therefore, are poorly positioned to provide meaningful and timely support for persons with disabilities. Furthermore, program enrollment and costs for the largest federal disability programs have been growing and are poised to grow even more rapidly in the future. For these reasons, GAO added modernizing federal disability to its high-risk areas in January 2003. GAO convened this forum to address some of the key issues related to modernizing federal disability policy. The forum brought together a diverse array of experts, including employers; advocate groups, researchers, and academia; and federal officials. Comments expressed do not necessarily represent the views of any individual participant or the organizations they represent, including GAO. However, GAO does make some concluding …

Testimony issued by the Government Accountability Office with an abstract that begins "Offshore tax evasion is difficult for the Internal Revenue Service (IRS) to address. IRS examines tax returns to deal with offshore evasion that has occurred. IRS's Qualified Intermediary (QI) program seeks to foster improved tax withholding and reporting. GAO was asked to testify on two topics. First, GAO was asked to provide information on (1) the length of, and assessments from, IRS's examination of tax returns with offshore activity and (2) the impact of the 3-year statute of limitations on offshore cases. Second, for the QI program, GAO was asked to address (1) program features intended to improve withholding and reporting, and (2) whether weaknesses exist in the U.S. withholding system for U.S. source income and QI external reviews and IRS's use of program data. GAO relied on prior work for the first topic. For the QI program, GAO used the latest data that were available and corroborated by IRS."

Testimony issued by the Government Accountability Office with an abstract that begins "U.S. agriculture generates over $1 trillion in economic activity annually, but concerns exist about its vulnerability to foreign pests and diseases. Under the agricultural quarantine inspection (AQI) program, passengers and cargo are inspected at U.S. ports of entry to intercept prohibited material and pests. The Homeland Security Act of 2002 transferred responsibility for inspections from the U.S. Department of Agriculture's (USDA) Animal and Plant Health Inspection Service (APHIS) to the Department of Homeland Security's (DHS) Customs and Border Protection (CBP). APHIS retained some AQI-related responsibilities, such as policy setting and training. This testimony is based on issued GAO reports and discusses (1) steps DHS and USDA took that were intended to strengthen the AQI program, (2) views of agriculture specialists of their work experiences since the transfer, and (3) management problems. As part of these reports, GAO surveyed a representative sample of agriculture specialists on their work experiences, analyzed inspection and interception data, and interviewed agency officials."

Several proteins involved in the response to DNA doublestrand breaks (DSB) f orm microscopically visible nuclear domains, orfoci, after exposure to ionizing radiation. Radiation-induced foci (RIF)are believed to be located where DNA damage occurs. To test thisassumption, we analyzed the spatial distribution of 53BP1, phosphorylatedATM, and gammaH2AX RIF in cells irradiated with high linear energytransfer (LET) radiation and low LET. Since energy is randomly depositedalong high-LET particle paths, RIF along these paths should also berandomly distributed. The probability to induce DSB can be derived fromDNA fragment data measured experimentally by pulsed-field gelelectrophoresis. We used this probability in Monte Carlo simulations topredict DSB locations in synthetic nuclei geometrically described by acomplete set of human chromosomes, taking into account microscope opticsfrom real experiments. As expected, simulations produced DNA-weightedrandom (Poisson) distributions. In contrast, the distributions of RIFobtained as early as 5 min after exposure to high LET (1 GeV/amu Fe) werenon-random. This deviation from the expected DNA-weighted random patterncan be further characterized by "relative DNA image measurements." Thisnovel imaging approach shows that RIF were located preferentially at theinterface between high and low DNA density regions, and were morefrequent than predicted in regions with lower DNA density. The samepreferential nuclear location was also measured …

Groundwater is sampled from 39 monitoring wells on the Nevada Test Site (NTS) as part of the Routine Radiological Environmental Monitoring Program. Many of these wells were not designed or constructed for long-term groundwater monitoring. Some have extensive completion zones and others have obstructions such as pumps and tubing. The high-volume submersible pumps in some wells are unsuitable for long-term monitoring and result in large volumes of water that may have to be contained and characterized before subsequent disposition. The configuration of most wells requires sampling stagnant well water with a wireline bailer. Although bailer sampling allows for the collection of depth-discrete samples, the collected samples may not be representative of local groundwater because no well purging is done. Low-maintenance, solar-powered jack pumps will be deployed in nine of these onsite monitoring wells to improve sample quality. These pumps provide the lift capacity to produce groundwater from the deep aquifers encountered in the arid environment of the NTS. The water depths in these wells range from 700 to 2,340 ft below ground surface. The considerable labor and electrical power requirements of electric submersible pumps are eliminated once these pumps are installed. Access tubing will be installed concurrent with the installation …

Evaluate the long-term retention of several facilities associated with the PNNL Capability Replacement Laboratory and other Hanfor mission needs. WCH prepared a mitigation plan for three scenarios with different release dates for specific buildings. The evaluations present a proposed plan for providing utility services to retained facilities in support of a long-term (+20 year) lifespan in addition to temporary services to buildings with specified delayed release dates.

X-ray photoelectron spectroscopy (XPS) is a quantitative, chemically specific technique with a probing depth of a few angstroms to a few nanometers. It is therefore ideally suited to investigate the chemical nature of the surfaces of catalysts. Because of the scattering of electrons by gas molecules, XPS is generally performed under vacuum conditions. However, for thermodynamic and/or kinetic reasons, the catalyst's chemical state observed under vacuum reaction conditions is not necessarily the same as that of a catalyst under realistic operating pressures. Therefore, investigations of catalysts should ideally be performed under reaction conditions, i.e., in the presence of a gas or gas mixtures. Using differentially pumped chambers separated by small apertures, XPS can operate at pressures of up to 1 Torr, and with a recently developed differentially pumped lens system, the pressure limit has been raised to about 10 Torr. Here, we describe the technical aspects of high-pressure XPS and discuss recent applications of this technique to oxidation and heterogeneous catalytic reactions on metal surfaces.

We exposed samples of B4C, amorphous C, chemical-vapor-deposition (CVD)-diamond C, Si, and SiC to single 25 fs-long pulses of 32.5 nm free-electron-laser radiation at fluences of up to 2.2 J/cm{sup 2}. The samples were chosen as candidate materials for x-ray free electron laser (XFEL) optics. We found that the threshold for surface-damage is on the order of the fluence required for thermal melting. For larger fluences, the crater depths correspond to temperatures on the order of the critical temperature, suggesting that the craters are formed by two-phase vaporization [1]. XFELs have the promise of producing extremely high-intensity ultrashort pulses of coherent, monochromatic radiation in the 1 to 10 keV regime. The expected high output fluence and short pulse duration pose significant challenges to the optical components, including radiation damage. It has not been possible to obtain direct experimental verification of the expected damage thresholds since appropriate x-ray sources are not yet available. FLASH has allowed us to study the interaction of high-fluence short-duration photon pulses with materials at the shortest wavelength possible to date. With these experiments, we have come closer to the extreme conditions expected in XFEL-matter interaction scenarios than previously possible.

Some white light-emitting diode (LED) light sources haverecently attained levels of efficiency and cost that allow them tocompete with fluorescent lighting for off-grid applications in thedeveloping world. Additional attributes (optics, size, ruggedness, andservice life) make them potentially superior products. Enormousreductions in energy use and greenhouse-gas emissions are thus possible,and system costs can be much lower given the ability to downsize thecharging and energy storage components compared to a fluorescentstrategy. However, there is a high risk of "market-spoiling" if inferiorproducts are introduced and result in user dissatisfaction. Completesystems involve the integration of light sources and optics, energysupply, and energy storage. A natural starting point for evaluatingproduct quality is to focus on the individual light sources. This reportdescribes testing results for batches of 10 5mm white LEDs from 26manufacturers. Efficacies and color properties are presented.

National Renewable Energy Laboratory (NREL) and Pacific Northwest National Laboratory (PNNL) are conducting research to investigate the feasibility of producing mixed alcohols from biomass-derived synthesis gas (syngas). PNNL is tasked with obtaining commercially available or preparing promising mixed-alcohol catalysts and screening them in a laboratory-scale reactor system. Commercially available catalysts and the most promising experimental catalysts are provided to NREL for testing using a slipstream from a pilot-scale biomass gasifier. From the standpoint of producing C2+ alcohols as the major product, it appears that the rhodium catalyst is the best choice in terms of both selectivity and space-time yield (STY). However, unless the rhodium catalyst can be improved to provide minimally acceptable STYs for commercial operation, mixed alcohol synthesis will involve significant production of other liquid coproducts. The modified Fischer-Tropsch catalyst shows the most promise for providing both an acceptable selectivity to C2+ alcohols and total liquid STY. However, further optimization of the Fischer-Tropsch catalysts to improve selectivity to higher alcohols is highly desired. Selection of a preferred catalyst will likely entail a decision on the preferred coproduct slate. No other catalysts tested appear amenable to the significant improvements needed for acceptable STYs.

Two Si-based spintronic materials, a Mn-Si digital ferromagnetic heterostructure ({delta}-layer of Mn doped in Si) with defects and dilutely doped Mn{sub x}Si{sub 1-x} alloy are investigated using a density-functional based approach. We model the heterostructure and alloy with a supercell of 64 atoms and examine several configurations of the Mn atoms. We find that 25% substitutional defects without vacancies in the {delta} layer diminishes half metallicity of the DFH substantially. For the alloy, the magnetic moment M ranges from 1.0-9.0 {mu}{sub B}/unit-cell depending on impurity configuration and concentration. Mn impurities introduce a narrow band of localized states near E{sub F}. These alloys are not half metals though their moments are integer. We explain the substantially different magnetic moments.

Nucleic acid aptamers have found steadily increased utility and application steadily over the last decade. In particular, aptamers have been touted as a valuable complement to and in some cases replacement for antibodies due to their structural and functional robustness as well as their ease in generation and synthesis. They are thus attractive for biosecurity applications, e.g. pathogen detection, and are especially well suited since their in vitro generation process does not require infection of any host systems. Herein we provide a brief overview of the aptamers generated against biopathogens over the last few years. In addition, a few recently described detection platforms using aptamers (aptasensors) and potentially suitable for biosecurity applications will be discussed.

This manuscript discusses the multilayer coating results for the primary and secondary mirrors of the Micro Exposure Tool (MET): a 0.30-numerical aperture (NA) lithographic imaging system with 200 x 600 {micro}m{sup 2} field of view at the wafer plane, operating in the extreme ultraviolet (EUV) wavelength region. Mo/Si multilayers were deposited by DC-magnetron sputtering on large-area, curved MET camera substrates, and a velocity modulation technique was implemented to consistently achieve multilayer thickness profiles with added figure errors below 0.1 nm rms to achieve sub-diffraction-limited performance. This work represents the first experimental demonstration of sub-diffraction-limited multilayer coatings for high-NA EUV imaging systems.

We present a description and scenario results from our recently-developed long-term model of United States industrial sector energy consumption, which we have incorporated as a module within the ObjECTS-MiniCAM integrated assessment model. This new industrial model focuses on energy technology and fuel choices over a 100 year period and allows examination of the industrial sector response to climate policies within a global modeling framework. A key challenge was to define a level of aggregation that would be able to represent the dynamics of industrial energy demand responses to prices and policies, but at a level that remains tractable over a long time frame. In our initial results, we find that electrification is an important response to a climate policy, although there are services where there are practical and economic limits to electrification, and the ability to switch to a low-carbon fuel becomes key. Cogeneration of heat and power using biomass may also play a role in reducing carbon emissions under a policy constraint.

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