How will the United States satisfy energy demand in a tightening global energy marketplace while, at the same time, reducing greenhouse gas emissions? Exascale computing -- expected to be available within the next eight to ten years ? may play a crucial role in answering that question by enabling a paradigm shift from test-based to science-based design and engineering. Computational modeling of complete power generation systems and engines, based on scientific first principles, will accelerate the improvement of existing energy technologies and the development of new transformational technologies by pre-selecting the designs most likely to be successful for experimental validation, rather than relying on trial and error. The predictive understanding of complex engineered systems made possible by computational modeling will also reduce the construction and operations costs, optimize performance, and improve safety. Exascale computing will make possible fundamentally new approaches to quantifying the uncertainty of safety and performance engineering. This report discusses potential contributions of exa-scale modeling in four areas of energy production and distribution: nuclear power, combustion, the electrical grid, and renewable sources of energy, which include hydrogen fuel, bioenergy conversion, photovoltaic solar energy, and wind turbines. Examples of current research are taken from projects funded by the U.S. …

Experiments in a number of conventional aspect ratio tokamaks have been successful in pacing edge localized modes (ELMs) by rapid vertical jogging of the plasma. This paper demonstrates the first pacing of ELMs in a spherical torus plasma. Applied 30 Hz vertical jogs synchronized the ELMs with the upward motion of the plasma. 45 Hz jogs also lead to an increase in the ELM frequency, though the synchronization of the ELMs and jogs was unclear. A reduction in the ELM energy was observed at the higher driven ELM frequencies. __________________________________________________

Photosynthetic assimilation of atmospheric carbon dioxide by land plants offers the underpinnings for terrestrial carbon (C) sequestration. A proportion of the C captured in plant biomass is partitioned to roots, where it enters the pools of soil organic C and soil inorganic C and can be sequestered for millennia. Bioenergy crops serve the dual role of providing biofuel that offsets fossil-fuel greenhouse gas (GHG) emissions and sequestering C in the soil through extensive root systems. Carbon captured in plant biomass can also contribute to C sequestration through the deliberate addition of biochar to soil, wood burial, or the use of durable plant products. Increasing our understanding of plant, microbial, and soil biology, and harnessing the benefits of traditional genetics and genetic engineering, will help us fully realize the GHG mitigation potential of phytosequestration.

Sulfate-reducing bacteria have been extensively studied for their potential in heavy-metal bioremediation. However, the occurrence of elevated nitrate in contaminated environments has been shown to inhibit sulfate reduction activity. Although the inhibition has been suggested to result from the competition with nitrate-reducing bacteria, the possibility of direct inhibition of sulfate reducers by elevated nitrate needs to be explored. Using Desulfovibrio vulgaris as a model sulfate-reducing bacterium, functional genomics analysis reveals that osmotic stress contributed to growth inhibition by nitrate as shown by the upregulation of the glycine/betaine transporter genes and the relief of nitrate inhibition by osmoprotectants. The observation that significant growth inhibition was effected by 70 mM NaNO{sub 3} but not by 70 mM NaCl suggests the presence of inhibitory mechanisms in addition to osmotic stress. The differential expression of genes characteristic of nitrite stress responses, such as the hybrid cluster protein gene, under nitrate stress condition further indicates that nitrate stress response by D. vulgaris was linked to components of both osmotic and nitrite stress responses. The involvement of the oxidative stress response pathway, however, might be the result of a more general stress response. Given the low similarities between the response profiles to nitrate and other stresses, …

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Stimulated by an acetate-amendment field experiment conducted in 2007, anaerobic microbial populations in the aquifer at the Rifle Integrated Field Research Challenge site in Colorado reduced mobile U(VI) to insoluble U(IV). During this experiment, planktonic biomass was sampled at various time points to quantitatively evaluate proteomes. In 2008, an acetate-amended field experiment was again conducted in a similar manner to the 2007 experiment. As there was no comprehensive metagenome sequence available for use in proteomics analysis, we systematically evaluated 12 different organism genome sequences to generate sets of aggregate genomes, or “pseudo-metagenomes”, for supplying relative quantitative peptide and protein identifications. Proteomics results support previous observations of the dominance of Geobacteraceae during biostimulation using acetate as sole electron donor, and revealed a shift from an early stage of iron reduction to a late stage of iron reduction. Additionally, a shift from iron reduction to sulfate reduction was indicated by changes in the contribution of proteome information contributed by different organism genome sequences within the aggregate set. In addition, the comparison of proteome measurements made between the 2007 field experiment and 2008 field experiment revealed differences in proteome profiles. These differences may be the result of alterations in abundance and population structure …

Electrofuels Project: MIT is using solar-derived hydrogen and common soil bacteria called Ralstonia eutropha to turn carbon dioxide (CO2) directly into biofuel. This bacteria already has the natural ability to use hydrogen and CO2 for growth. MIT is engineering the bacteria to use hydrogen to convert CO2 directly into liquid transportation fuels. Hydrogen is a flammable gas, so the MIT team is building an innovative reactor system that will safely house the bacteria and gas mixture during the fuel-creation process. The system will pump in precise mixtures of hydrogen, oxygen, and CO2, and the online fuel-recovery system will continuously capture and remove the biofuel product.

Electrofuels Project: MIT is using carbon dioxide (CO2) and hydrogen generated from electricity to produce natural oils that can be upgraded to hydrocarbon fuels. MIT has designed a 2-stage biofuel production system. In the first stage, hydrogen and CO2 are fed to a microorganism capable of converting these feedstocks to a 2-carbon compound called acetate. In the second stage, acetate is delivered to a different microorganism that can use the acetate to grow and produce oil. The oil can be removed from the reactor tank and chemically converted to various hydrocarbons. The electricity for the process could be supplied from novel means currently in development, or more proven methods such as the combustion of municipal waste, which would also generate the required CO2 and enhance the overall efficiency of MIT’s biofuel-production system.

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This report discusses actions taken by 111th Congress to reduce fatalities within the coal mining industry and reviews congressional mandates to accommodate for a safer working environment.

This report focuses on the transition of employees from National Security Personnel System (NSPS) to non-NSPS pay systems. It does not address the operation of NSPS or other pay schedules. The report discusses how the transition is scheduled to occur and analyzes congressional options for oversight or legislative action.

This report discusses issues for Congress in FY2011, which are whether to approve, reject, or modify DOD's new KC-X competition strategy, and whether to approve, reject, or modify the Air Force's request for FY2011 research and development funding for the new KC-X program.

This report discusses short-term policy issues about how to elicit cooperation and how to address People's Republic of China (PRC) concerns about the U.S.-led war (Operation Enduring Freedom).

The Federal Reserve (Fed) has been central in the policy response to the financial turmoil that began in August 2007. It has sharply increased reserves to the banking system through open market operations and lowered the federal funds rate and discount rate on several occasions. This report reviews the Fed's actions since August 2007 and analyzes the policy issues raised by those actions.

This report provides analysis of various policy options for providing tax relief to oil spill victims, highlighting the circumstantial differences between previous natural disasters and the current oil spill. The report concludes with a brief summary of current legislative efforts.

The availability of radio frequency spectrum is considered essential to developing a modern, interoperable communications network for public safety. Equally critical is building the radio network to use this spectrum. Opinions diverge, however, on such issues as how much spectrum should be made available for the network, who should own it, who should build it, who should operate it, who should be allowed to use it, and how it might be paid for. This report discusses potential paths forward for Congress in regards to modernizing communications. To resolve the debate and move the planning process forward, Congress may decide to pursue oversight or change existing law. Actions proposed to Congress include (1) authorizing the Federal Communications Commission (FCC) to reassign spectrum and (2) changing requirements for the use of spectrum auction proceeds. In particular, legislation in the Deficit Reduction Act of 2005 (P.L. 109-171) might be modified. This law mandated the termination of analog television broadcasting and the release of those channels for other uses, including public safety.

This report discusses the Project BioShield Act (P.L. 108-276). In 2004 Congress passed the law to encourage the private sector to develop medical countermeasures against chemical, biological, radiological, and nuclear (CBRN) terrorism agents and to provide a novel mechanism for federal acquisition of those newly developed countermeasures. This law provides three main authorities: (1) relaxing regulatory requirements for some CBRN terrorism-related spending, including hiring personnel and awarding research grants; (2) guaranteeing a federal market for new CBRN medical countermeasures; and (3) permitting emergency use of unapproved countermeasures.

On April 20, 2010, an explosion and fire occurred on the Deepwater Horizon drilling rig in the Gulf of Mexico. This resulted in 11 worker fatalities, a massive oil release, and a national response effort in the Gulf of Mexico region by the federal and state governments as well as BP. Based on estimates from the Flow Rate Technical Group, which is led by the U.S. Geological Survey, the 2010 Gulf spill has become the largest oil spill in U.S. waters. The oil spill has damaged natural resources and has had regional economic impacts. In addition, questions have been raised as to whether offshore regulation of oil exploration has kept pace with the increasingly complex technologies needed to explore and develop deeper waters. This report provides an initial overview of Deepwater Horizon-related issues for Congress, and refers readers to in-depth CRS reports on specific issues.

This report covers the country-of-origin labeling (COOL) system implemented by the U.S. Department of Agriculture. Canada and Mexico say that the (COOL) system is unfair and does not meet its original objectives, while Congress is considering legislation that would further expand labeling requirements.

This report discusses the current political and economic conditions in Russia, focusing on the impact of Vladimir Putin's leadership and the leadership of his successor/protégé, Dmitriy Medvedev, both of which have steered Russia away from democratization. The report also discusses the state of the economy since the Soviet collapse in 1999, how the recent global economic downturn has affected Russia, the state of Russia's military, and the current relationship between Russia and the United States.

A letter report issued by the Government Accountability Office with an abstract that begins "Pervasive and sustained computer-based attacks pose a potentially devastating impact to systems and operations and the critical infrastructures they support. Addressing these threats depends on effective partnerships between the government and private sector owners and operators of critical infrastructure. Federal policy, including the Department of Homeland Security's (DHS) National Infrastructure Protection Plan, calls for a partnership model that includes public and private councils to coordinate policy and information sharing and analysis centers to gather and disseminate information on threats to physical and cyber-related infrastructure. GAO was asked to determine (1) private sector stakeholders' expectations for cyber-related, public-private partnerships and to what extent these expectations are being met and (2) public sector stakeholders' expectations for cyber-related, public-private partnerships and to what extent these expectations are being met. To do this, GAO conducted surveys and interviews of public and private sector officials and analyzed relevant policies and other documents."

A letter report issued by the Government Accountability Office with an abstract that begins "Before the passage of federal environmental legislation in the 1970s and 1980s, Department of Defense (DOD) activities contaminated millions of acres of soil and water on and near DOD sites. The Environmental Protection Agency (EPA) has certain oversight authorities for cleaning up contaminants on federal property, and has placed 1,620 of the most contaminated sites--including 141 DOD installations--on its National Priorities List (NPL). As of February 2009, after 10 or more years on the NPL, 11 DOD installations had not signed the required interagency agreements (IAG) to guide cleanup with EPA. GAO was asked to examine (1) the status of DOD cleanup of hazardous substances at selected installations that lacked IAGs, and (2) obstacles, if any, to cleanup at these installations. GAO selected and visited three installations, reviewed relevant statutes and agency documents, and interviewed agency officials."

A letter report issued by the Government Accountability Office with an abstract that begins "Adaptive housing assistance grants help eligible service members or veterans adapt or modify a residence to accommodate disabilities sustained through military service. The Veterans' Housing Opportunity and Benefits Improvement Act of 2006 authorized the Department of Veterans Affairs (VA) to expand its existing adaptive housing assistance grants to include eligible individuals temporarily living in a home owned by a family member, known as Temporary Residence Adaptation (TRA) grants. The act also mandated GAO to issue interim and final reports on VA's implementation of TRA. This final report examines (1) the characteristics of TRA grants and grantees and (2) what accounts for low utilization of the program and how to ensure that the program serves its intended recipients. To address these objectives, GAO analyzed VA data and documents and interviewed service members and veterans who both had and had not used the TRA grant."