A letter report issued by the Government Accountability Office with an abstract that begins "Based on available data, about 14 percent of small employers sponsor some type of retirement plan. Overall, GAO found that the likelihood that a small employer will sponsor a retirement plan largely depends on the size of the employer’s workforce and the workers’ average wages more than on the industry in which the employer operates and the geographic region in which the employer is located. GAO found the greatest likelihood of plan sponsorship was among small employers with larger numbers of employees and those paying an average annual wage of $50,000 to $99,999. GAO also found that the most common plans sponsored by small employers are 401(k)s and Savings Incentive Match Plans for Employees (SIMPLE) Individual Retirement Arrangements (IRA)—an employer-sponsored IRA designed for small employers—at 46 percent and 40 percent, respectively, of total plans. However, IRS currently does not have the means to collect information on employers that sponsor another type of IRA plan designed for small employers, the Simplified Employee Pension (SEP) IRA plan, which limits what is known about employers that sponsor these plans."

Recently, variational symplectic algorithms have been developed for the long-time simulation of charged particles in magnetic fields1-3. As a direct consequence of their derivation from a discrete variational principle, these algorithms have very good long-time energy conservation, as well as exactly preserving discrete momenta. We present stability results for these algorithms, focusing on understanding how explicit variational integrators can be designed for this type of system. It is found that for explicit algorithms an instability arises because the discrete symplectic structure does not become the continuous structure in the t → 0 limit. We examine how a generalized gauge transformation can be used to put the Lagrangian in the "antisymmetric discretization gauge," in which the discrete symplectic structure has the correct form, thus eliminating the numerical instability. Finally, it is noted that the variational guiding center algorithms are not electromagnetically gauge invariant. By designing a model discrete Lagrangian, we show that the algorithms are approximately gauge invariant as long as A and #30; are relatively smooth. A gauge invariant discrete Lagrangian is very important in a variational particle-in-cell algorithm where it ensures current continuity and preservation of Gauss's law4.

The Integrated Field Research Challenge (IFRC) at the Hanford Site 300 Area uranium (U) plume addresses multi-scale mass transfer processes in a complex subsurface biogeochemical setting where groundwater and riverwater interact. A series of forefront science questions on reactive mass transfer motivates research. These questions relate to the effect of spatial heterogeneities; the importance of scale; coupled interactions between biogeochemical, hydrologic, and mass transfer processes; and measurements and approaches needed to characterize and model a mass-transfer dominated biogeochemical system. The project was initiated in February 2007, with CY 2007, CY 2008, CY 2009, and CY 2010 progress summarized in preceding reports. A project peer review was held in March 2010, and the IFRC project acted upon all suggestions and recommendations made in consequence by reviewers and SBR/DOE. These responses have included the development of 'Modeling' and 'Well-Field Mitigation' plans that are now posted on the Hanford IFRC web-site, and modifications to the IFRC well-field completed in CY 2011. The site has 35 instrumented wells, and an extensive monitoring system. It includes a deep borehole for microbiologic and biogeochemical research that sampled the entire thickness of the unconfined 300 A aquifer. Significant, impactful progress has been made in CY 2011 including: …

This report discusses the National Telecommunications and Information Administration (NTIA), which is an agency of the Department of Commerce set up to advise on domestic and international telecommunications and information policies.

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In recent years, increasing deployment of large wind-turbine farms has become an issue of growing concern for the radar community. The large radar cross section (RCS) presented by wind turbines interferes with radar operation, and the Doppler shift caused by blade rotation causes problems identifying and tracking moving targets. Each new wind-turbine farm installation must be carefully evaluated for potential disruption of radar operation for air defense, air traffic control, weather sensing, and other applications. Several approaches currently exist to minimize conflict between wind-turbine farms and radar installations, including procedural adjustments, radar upgrades, and proper choice of low-impact wind-farm sites, but each has problems with limited effectiveness or prohibitive cost. An alternative approach, heretofore not technically feasible, is to reduce the RCS of wind turbines to the extent that they can be installed near existing radar installations. This report summarizes efforts to reduce wind-turbine RCS, with a particular emphasis on the blades. The report begins with a survey of the wind-turbine RCS-reduction literature to establish a baseline for comparison. The following topics are then addressed: electromagnetic model development and validation, novel material development, integration into wind-turbine fabrication processes, integrated-absorber design, and wind-turbine RCS modeling. Related topics of interest, including alternative …

This report is a look at the funding for the National Institute of Standards and Technology (NIST), a laboratory of the Department of Commerce. NIST is mandated to provide technical services to facilitate the competitiveness of U.S. industry. In 2007, the Advanced Technology Program (ATP) was terminated and replaced by the Technology Innovation Program (TIP). However, no funding was appropriated for TIP in the FY2012 appropriations legislation and NIST is "...currently taking the necessary actions for an orderly shutdown." In April 2009, the current President stated his decision to double the budget of key science agencies, including NIST, over the next 10 years. While additional funding has been forthcoming, it remains to be seen how support for internal R&D at NIST will evolve and how this might affect financing of extramural efforts such as MEP. The dispensation of funding for NIST programs may influence the way by which the federal government supports technology development for commercial application.