Recently, attention has been drawn towards black carbon aerosols as a likely short-term climate warming mitigation candidate. However the global and regional impacts of the direct, cloud-indirect and semi-direct forcing effects are highly uncertain, due to the complex nature of aerosol evolution and its climate interactions. Black carbon is directly released as particle into the atmosphere, but then interacts with other gases and particles through condensation and coagulation processes leading to further aerosol growth, aging and internal mixing. A detailed aerosol microphysical scheme, MATRIX, embedded within the global GISS modelE includes the above processes that determine the lifecycle and climate impact of aerosols. This study presents a quantitative assessment of the impact of microphysical processes involving black carbon, such as emission size distributions and optical properties on aerosol cloud activation and radiative forcing. Our best estimate for net direct and indirect aerosol radiative forcing change is -0.56 W/m{sup 2} between 1750 and 2000. However, the direct and indirect aerosol effects are very sensitive to the black and organic carbon size distribution and consequential mixing state. The net radiative forcing change can vary between -0.32 to -0.75 W/m{sup 2} depending on these carbonaceous particle properties. Assuming that sulfates, nitrates and secondary …

High-performance computing (HPC) systems are growing more powerful by utilizing more hardware components. As the system mean-time-before-failure correspondingly drops, applications must checkpoint more frequently to make progress. However, as the system memory sizes grow faster than the bandwidth to the parallel file system, the cost of checkpointing begins to dominate application run times. A potential solution to this problem is to use multi-level checkpointing, which employs multiple types of checkpoints with different costs and different levels of resiliency in a single run. The goal is to design light-weight checkpoints to handle the most common failure modes and rely on more expensive checkpoints for less common, but more severe failures. While this approach is theoretically promising, it has not been fully evaluated in a large-scale, production system context. To this end we have designed a system, called the Scalable Checkpoint/Restart (SCR) library, that writes checkpoints to storage on the compute nodes utilizing RAM, Flash, or disk, in addition to the parallel file system. We present the performance and reliability properties of SCR as well as a probabilistic Markov model that predicts its performance on current and future systems. We show that multi-level checkpointing improves efficiency on existing large-scale systems and that …

We describe analytical formalism for estimating neutron radiative capture and elastic scattering cross section covariances in the resolved resonance region. We use capture and scattering kernels as the starting point and show how to get average cross sections in broader energy bins, derive analytical expressions for cross section sensitivities, and deduce cross section covariances from the resonance parameter uncertainties in the recently published Atlas of Neutron Resonances. The formalism elucidates the role of resonance parameter correlations which become important if several strong resonances are located in one energy group. Importance of potential scattering uncertainty as well as correlation between potential scattering and resonance scattering is also examined. Practical application of the formalism is illustrated on {sup 55}Mn(n,{gamma}) and {sup 55}Mn(n,el).

Marine microbes include representatives from all three kingdoms of life and collectively carry out virtually all forms of metabolisms found on the planet. Because of this metabolic and genetic diversity, these microbes mediate many of the reactions making up global biogeochemical cycles which govern the flow of energy and material in the biosphere. The goal of this conference is to bring together approaches and concepts from studies of microbial evolution, genomics, ecology, and oceanography in order to gain new insights into marine microbes and their biogeochemical functions. The integration of scales, from genes to global cycles, will result in a better understanding of marine microbes and of their contribution to the carbon cycle and other biogeochemical processes.

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This report examines the history, practice, and procedures of the Senate in fulfilling its constitutional obligation to try and to vote whether to convict and impose judgment upon judges impeached by the House of Representatives. It includes an overview of the process, and sections that discuss rules governing Senate impeachment proceedings, organizing the Senate for trial, the role of the Presiding Officer, the use of an impeachment trial committee, deliberation and judgment by the full senate, length of Senate impeachment trials, and concluding observations.

This report provides an introduction of Supreme Court appointments in historical context. The report discusses the Supreme Court Justices demographic characteristics, professional background, and educational background.

This report provides an overview of the Multilateral Development Banks (MDBs) and highlights major current issues for Congress. The first section discusses the history of the MDBs, their operations, major donor contributions, their organization, and debates about the effectiveness of MDB financial assistance. The second section discusses issues of particular interest to Congress, including congressional legislation authorizing and appropriating U.S. contributions to the MDBs, congressional oversight of the MDBs, and U.S. commercial interests in the MDBs. It also discusses recent proposals for increasing the voting power of emerging-markets at the World Bank.

This report provides a brief overview of federal employment and training programs and policies specifically targeted to help veterans seeking employment in the civilian economy. Transition assistance programs are operated by the Department of Defense (DOD), the Department of Veterans Affairs (VA), and the Department of Labor (DOL) to assist servicemembers as they prepare to leave the military.

This report provides an overview of Jordanian politics and current issues in U.S.-Jordanian relations. It provides a brief discussion of Jordan's government and economy and of its cooperation in promoting Arab-Israeli peace and other U.S. policy objectives in the Middle East.

This report focuses on the potential implications of China's naval modernization for future required U.S. Navy capabilities. This report is based on unclassified open-source information, such as the annual Department of Defense (DOD) report to Congress on China's military power, an August 2009 report from the Office of Naval Intelligence (ONI), and published reference sources such as Jane's Fighting Ships.

The financial crisis that began in 2007 spread and gathered intensity in 2008, despite the efforts of central banks and regulators to restore calm. By early 2009, the financial system and the global economy appeared to be locked in a descending spiral, and the primary focus of policy became the prevention of a prolonged downturn on the order of the Great Depression. This report sets out in tabular form a number of the factors that have been identified as causes of the crisis. The left column of Table 1 below summarizes the causal role of each such factor. The next column presents a brief rejoinder to that argument. The right-hand column contains a reference for further reading.

This report provides background information and presents potential issues for Congress concerning the Navy's ship force-structure goals and shipbuilding plans. The planned size of the Navy, the rate of Navy ship procurement, and the prospective affordability of the Navy's shipbuilding plans have been matters of concern for the congressional defense committees for the past several years. Decisions that Congress makes on Navy shipbuilding programs can substantially affect Navy capabilities and funding requirements, and the U.S. shipbuilding industrial base.

This report focuses on the United States' relationship with Iran and how the Obama Administration is handling prior administrations' economic sanctions against Iran. The Obama Administration's policy approach toward Iran has contrasted with the Bush Administration's by attempting to couple the imposition of sanctions to an active and direct U.S. effort to negotiate with Iran on the nuclear issue.

This report provides an overview of the Defense Base Act (DBA) and the systems used to provide DBA insurance at the Department of State (DOS), the U.S. Agency for International Development (USAID), the Department of Defense (DOD), and the U.S. Army Corps of Engineers (USACE). Also included are criticisms of the current DOD DBA policy raised by GAO and Army auditors as well as responses to those criticisms by DOD and USACE. The report concludes with a discussion of several DBA reform options suggested by the House of Representatives in recent legislation and analyzed by DOD.

A letter report issued by the Government Accountability Office with an abstract that begins "Over 9 million passengers departed from U.S. ports on cruise ships in 2008, and according to agency officials, cruise ships are attractive terrorist targets. GAO was asked to review cruise ship security, and this report addresses the extent to which (1) the Coast Guard, the lead federal agency on maritime security, assessed risk in accordance with the Department of Homeland Security's (DHS) guidance and identified risks; and (2) federal agencies, cruise ship and facility operators, and law enforcement entities have taken actions to protect cruise ships and their facilities. GAO reviewed relevant requirements and agency documents on maritime security, analyzed 2006 through 2008 security operations data, interviewed federal and industry officials, and made observations at seven ports. GAO selected these locations based on factors such as the number of sailings from each port. Results of the visits provided additional information on security, but were not projectable to all ports."

A letter report issued by the Government Accountability Office with an abstract that begins "The Department of Defense (DOD) established the military munitions response program (MMRP) in 2001 to clean up sites known to be or suspected of being contaminated with military munitions and related hazardous substances. Cleanup of sites on active and base realignment and closure installations is the responsibility of the military service--Air Force, Army, Navy, or Marine Corps--that currently controls the land, and the Army has delegated execution of cleanup of formerly used defense sites (FUDS) to the U.S. Army Corps of Engineers (Corps). GAO was mandated to assess the (1) MMRP staffing and funding levels; (2) progress DOD has made in cleaning up munitions response sites; (3) extent to which DOD has established MMRP performance goals; and (4) extent to which DOD collects data on factors influencing project duration, as well as the accuracy of its cleanup cost estimates. GAO analyzed MMRP data and DOD documents and interviewed officials from DOD, the military services, and the Corps."

Daily publication of the U.S. Office of the Federal Register contains rules and regulations, proposed legislation and rule changes, and other notices, including "Presidential proclamations and Executive Orders, Federal agency documents having general applicability and legal effect, documents required to be published by act of Congress, and other Federal agency documents of public interest" (p. ii). Table of Contents starts on page iii.

A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.