A letter report issued by the Government Accountability Office with an abstract that begins "The Federal Transit Administration's (FTA) Capital Investment Grant program funds, among other things, projects for fixed-guideway systems--often called New Starts projects. In 2005, the Safe, Accountable, Flexible, Efficient Transportation Equity Act-A Legacy for Users (SAFETEA-LU) established a category of lower-cost projects--Small Starts--which expands project eligibility and offers streamlined requirements. FTA subsequently created the Very Small Starts category with a further streamlined process for very low-cost projects. Exempt projects, those receiving under $25 million and typically designated by Congress, also have a simplified process. As part of GAO's annual mandate to review New Starts, this report describes (1) the history of Small Starts and Very Small Starts and the type of projects FTA recommended for funding; (2) the project development requirements for Small Starts and Very Small Starts and what stakeholders identify as the advantages and disadvantages of the requirements; and (3) the project development requirements for exempt projects, the projects selected to receive funding, and what stakeholders identify as the advantages and disadvantages of this category. Among other things, GAO analyzed laws, regulations, and agency guidance, and interviewed FTA headquarters staff and stakeholders from 7 FTA …

A letter report issued by the Government Accountability Office with an abstract that begins "Developing capable Iraqi and Afghan security forces is a key component of the U.S. military effort in Iraq and Afghanistan and, in 2009, the Army began augmenting brigade combat teams (BCT) with advisor personnel to advise the host nation security forces in these countries. House Armed Services Committee report 111-491 directed GAO to report on the Army's plans to augment BCTs to perform advising missions in Iraq and Afghanistan. This report (1) identifies the key characteristics of the augmented BCT concept; (2) assesses the extent to which the Army has provided augmented BCTs, and what challenges, if any, these units have faced; and (3) assesses the extent to which requirements for augmented BCTs have impacted overall Army personnel requirements, including the Army's ability to provide advisor personnel. GAO examined augmented BCT doctrine and guidance, analyzed advisor requirements, reviewed after- action reviews and lessons learned from augmented BCTs, and interviewed Army, theater command, and augmented BCT officials."

This report, updated as warranted, discusses U.S. security assistance to Taiwan, or Republic of China (ROC), including policy issues for Congress and legislation.

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The purpose of this report is to evaluate the potential dose distribution resulting from surface radioactivity, using occupational radiation exposure scenarios. The surface radioactivity clearance values considered in this analysis may ultimately replace those currently specified in the U.S. Department of Energy (DOE) requirements and guidance for radiological protection of workers, the public and the environment. The surface contamination values apply to radioactive contamination deposited on a surface (i.e., not incorporated into the interior of the material). For these calculations, the dose coefficients for intake of radionuclides were taken from ICRP Publication 68 (ICRP 1994), and external exposure dose coefficients were taken from the compact disc (CD) that accompanied Federal Guidance Report (FGR) 13 (Eckerman et al. 1999). The ICRP Publication 68 dose coefficients were based on ICRP Publication 60 (ICRP 1990) and were used specifically for worker dose calculations. The calculated dose in this analysis is the 'effective dose' (ED), rather than the 'effective dose equivalent' (EDE).

Understanding the structure of the nucleon is of fundamental importance in sub-atomic physics. Already the experimental studies on the electro-magnetic form factors in the 1950s showed that the nucleon has a nontrivial internal structure, and the deep inelastic scattering experiments in the 1970s revealed the partonic substructure of the nucleon. Modern research focuses in particular on the spin and the gluonic structure of the nucleon. Experiments using deep inelastic scattering or polarized p-p collisions are carried out in the US at the CEBAF and RHIC facilities, respectively, and there are other experimental facilities around the world. More than twenty years ago, the European Muon Collaboration published their first experimental results on the proton spin structure as revealed in polarized deep inelastic lepton-nucleon scattering, and concluded that quarks contribute very little to the proton's spin. With additional experimental and theoretical investigations and progress in the following years, it is now established that, contrary to naive quark model expectations, quarks and anti-quarks carry only about 30% of the total spin of the proton. Twenty years later, the discovery from the polarized hadron collider at RHIC was equally surprising. For the phase space probed by existing RHIC experiments, gluons do not seem to …

The Small Column Ion Exchange (SCIX) process is being developed to remove cesium, strontium, and actinides from Savannah River Site (SRS) Liquid Waste using an existing waste tank (i.e., Tank 41H) to house the process. Following strontium, actinide, and cesium removal, the concentrated solids will be transported to a sludge tank (i.e., monosodium titanate (MST)/sludge solids to Tank 42H or Tank 51H and crystalline silicotitanate (CST) to Tank 40H) for eventual transfer to the Defense Waste Processing Facility (DWPF). Savannah River National Laboratory (SRNL) is conducting pilot-scale mixing tests to determine the pump requirements for mixing MST, CST, and simulated sludge. The purpose of this pilot scale testing is to determine the pump requirements for mixing MST and CST with sludge in a sludge tank and to determine whether segregation of particles occurs during settling. Tank 40H and Tank 51H have four Quad Volute pumps; Tank 42H has four standard pumps. The pilot-scale tank is a 1/10.85 linear scaled model of Tank 40H. The tank diameter, tank liquid level, pump nozzle diameter, pump elevation, and cooling coil diameter are all 1/10.85 of their dimensions in Tank 40H. The pump locations correspond to the current locations in Tank 40H (Risers B2, …

In the International Linear Collider, two linear accelerators will accelerate bunches of positrons and electrons to over a hundred billion electron volts and collide them in a central detector. In order to obtain useful collision rates, the bunches, each containing twenty billion particles, must be compressed to a cross section of a few nanometers by a few hundred nanometers. In order to prepare these ultra high density bunches, damping rings (DRs) are employed before the linear accelerators. The DRs take the high emittance bunches that are provided by the electron and positron sources and, through the process of radiation damping, squeeze them into ultra low emittance beams that are ready for the main linear accelerators. In the damping rings, a number of effects can prevent the successful preparation of the beams. In the electron ring, an effect known as the fast ion instability can lead to beam growth and, in the positron ring, the build-up of an electron cloud (EC), which interacts with the circulating bunches, can produce the same effect. EC build-up and the subsequent interaction of the cloud with the positron beam in the DR have been identified as major risks for the successful construction of a linear …

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Monosodium titanate (MST) for use in the Actinide Removal Process (ARP) must be qualified and verified in advance. A single qualification sample for each batch of material is sent to SRNL for analysis, as well as a statistical sampling of verification samples. The Harrell Industries Lot #050411 qualification and 12 verification samples met all the requirements in the specification indicating the material is acceptable for use in the process.