Thousands of children are diagnosed with autism each year, with a rate of occurrence of 1 in 150 births, compared to 5 per 10,000 just two decades ago. This astounding escalation has professionals scrambling to explain why the devastating neurological disorder, which profoundly affects a person’s language and social development, is on the rise. Are we simply getting better at diagnosing autism, or is a modern health crisis unfolding before us?

A letter report issued by the Government Accountability Office with an abstract that begins "This report presents our opinion on the financial statements of the Congressional Award Foundation (the Foundation) for the fiscal years ended September 30, 2007, and 2006. These financial statements are the responsibility of the Foundation. This report also presents (1) our opinion on the effectiveness of the Foundation's related internal control as of September 30, 2007, and (2) the results of our tests of the Foundation's compliance in fiscal year 2007 with selected provisions of laws and regulations. We conducted our audit pursuant to section 107 of the Congressional Award Act, as amended (2 U.S.C. 807), and in accordance with U.S. generally accepted government auditing standards."

A letter report issued by the Government Accountability Office with an abstract that begins "In 1995, GAO first designated the Department of Defense's (DOD) business systems modernization program as "high risk," and GAO continues to do so today. To assist in addressing this high-risk area, the Ronald W. Reagan National Defense Authorization Act for Fiscal Year 2005 contains provisions that are consistent with prior GAO investment management and enterprise architecture-related recommendations, and requires the department to submit annual reports to its congressional committees on its compliance with these provisions. The act also directs GAO to review each annual report. In response, GAO assessed the actions taken by DOD to comply with requirements of the act. To do so, GAO leveraged its recent reports on various aspects of the department's modernization management controls, and it reviewed, for example, the latest version of its business enterprise architecture and the associated transition plan and architecture federation strategy. GAO also interviewed key officials."

A letter report issued by the Government Accountability Office with an abstract that begins "Government and private-sector interest is growing in unmanned aircraft systems (UAS) for use in a variety of missions such as U.S. border protection, hurricane research, law enforcement, and real estate photography. However, UASs can fly only after the Federal Aviation Administration (FAA) conducts a case-by-case safety analysis. GAO's research questions included (1) What are the current and potential uses and benefits of UASs? (2) What challenges exist in operating UASs safely and routinely in the national airspace system? and (3) What is the federal government's response to these challenges? To address these questions, GAO reviewed the literature, interviewed agency officials and aviation stakeholders, and surveyed 23 UAS experts."

A letter report issued by the Government Accountability Office with an abstract that begins "Federal law requires commercial drivers to submit urine specimens for drug testing. The Federal Motor Carrier Safety Administration (FMCSA) is responsible for ensuring that motor carriers comply with these regulations. Recent reports have raised concerns that some drivers may not be tested, some may be tested but avoid detection, and some may test positive but continue to drive. GAO was asked to look at these challenges. This report reviews (1) the factors that contribute to challenges related to drug testing and (2) the various options that exist to address these challenges. GAO obtained information from a wide variety of stakeholders in the drug testing industry, and analyzed data from FMCSA and others to determine the potential effectiveness of various options."

A letter report issued by the Government Accountability Office with an abstract that begins "Federal entities--agencies, corporations, and others--are growing users of credit and debit cards, as both "merchants" (receiving payments) and purchasers. Merchants accepting cards incur fees--called merchant discount fees--paid to banks to process the transactions. For Visa and MasterCard transactions, a large portion of these fees-- referred to as interchange--goes to the card-issuing banks. Some countries have acted to limit these fees. GAO was asked to examine (1) the benefits and costs associated with federal entities' acceptance of cards, (2) the effects of other countries' actions to limit interchange fees, and (3) the impact on federal entities of using cards to make purchases. Among other things, GAO analyzed fee data and information on the impact of accepting and using cards from the Department of the Treasury (Treasury) and the General Services Administration, reviewed literature, and interviewed officials of major card companies and three foreign governments."

Correspondence issued by the Government Accountability Office with an abstract that begins "This report formally transmits the briefing in response to the Senate Report on the National Defense Authorization Act for Fiscal Year 2008. The report required GAO to review and make recommendations regarding the reports, assessments, analyses, and documents used for determining the compliance of the Department of Defense and military departments with the percentage limitation in 10 U.S.C. 2466--frequently referred to as the 50/50 requirement. On April 23 and 24, 2008, we provided the briefing to staff of Congressional committees to satisfy the mandate requirement."

A letter report issued by the Government Accountability Office with an abstract that begins "In the future, businesses will demand workers with higher-level skills and more education. Community colleges are key providers of career and technical training as well as traditional academic education. These colleges can also play important roles in the one-stop system created by the Workforce Investment Act (WIA), through which a variety of federally funded employment and training programs provide services. Given the importance of community colleges to workforce development, GAO was asked to examine (1) how community colleges meet the workforce training needs of their communities; (2) what community colleges do to integrate with the nation's one-stop system; (3) the conditions or practices that enhance or impede these efforts; and (4) the actions the Departments of Labor and Education have taken to encourage linkages between community colleges and the workforce investment system, including one-stops. To address these objectives, GAO visited 20 community colleges, surveyed one-stop centers and their associated workforce investment boards, and talked to Labor and Education officials. Labor and Education generally agreed with GAO's findings."

Testimony issued by the Government Accountability Office with an abstract that begins "The Defense Base Act (DBA) requires U.S. government contractors and subcontractors to buy workers' compensation insurance for employees working overseas, and the cost of this insurance is then passed on to the government. The Department of Labor oversees the claims process and ensures contractors are aware of DBA insurance requirements. Given the large number of contractor personnel working in Iraq, concerns have been raised over the cost of workers' compensation insurance provided under DBA. Since the Iraq conflict began in March 2003, federal agencies have issued contracts for Iraq reconstruction and to support deployed forces. The Department of Defense (DOD) recently reported it alone has 163,591 contractor personnel working in Iraq. Based on GAO's 2005 report on DBA insurance, Congress directed DOD to address challenges identified. This testimony is based on the 2005 report and GAO's analysis of recent agency efforts. As requested, it provides an update on (1) DOD's efforts to reduce DBA insurance rates; (2) DOD's ability to calculate its total DBA insurance costs; and (3) the progress toward addressing prior DBA implementation challenges. In preparation for this testimony, GAO reviewed related reports to identify agency …

A letter report issued by the Government Accountability Office with an abstract that begins "The Smithsonian Institution's governing body, the Board of Regents (Board), has developed a set of actions to address governance and accountability breakdowns that came to light in 2007. These actions were aimed at problems in three main areas: (1) executive compensation, benefits, ethics, and operational policies and controls; (2) flow of information to the Board, transparency of Board operations, and relationship with stakeholders; and (3) the Board's responsibilities, structure, and performance. GAO was asked to assess the extent of the Board's progress in each of these areas. GAO obtained information and data from the Board's regents, Smithsonian executives, and other stakeholders and also analyzed other organizations whose boards had faced similar governance challenges."

Among the olivine-structured metal phosphate family, LiMnPO{sub 4} exhibits a high discharge potential (4V), which is still compatible with common electrolytes, making it interesting for use in the next generation of Li ion batteries. The extremely low electronic conductivity of this material severely limits its electrochemical performance, however. One strategy to overcome this limitation is to make LiMnPO{sub 4} nanoparticulate to decrease the diffusion distance. Another is to add a carbon or other conductive coating in intimate contact with the nanoparticles of the main phase, as is commonly done with LiFePO{sub 4}. The electrochemical performance of LiFePO{sub 4} is highly dependent on the quality of the carbon coatings on the particles [1-2], among other variables. Combustion synthesis allows the co-synthesis of nanoparticles coated with carbon in one step. Hydrothermal synthesis is used industrially to make LiFePO{sub 4} cathode materials [3] and affords a good deal of control over purity, crystallinity, and particle size. A wide range of olivine-structured materials has been successfully prepared by this technique [4], including LiMnPO{sub 4} in this study. In this paper, we report on the new synthesis of nano-LiMnPO{sub 4} by a combustion method. The purity is dependent upon the conditions used for synthesis, including …

In this study we analyze relative contributions to the cause and mechanism of injection-induced micro-earthquakes (MEQs) at The Geysers geothermal field, California. We estimated the potential for inducing seismicity by coupled thermal-hydrological-mechanical analysis of the geothermal steam production and cold water injection to calculate changes in stress (in time and space) and investigated if those changes could induce a rock mechanical failure and associated MEQs. An important aspect of the analysis is the concept of a rock mass that is critically stressed for shear failure. This means that shear stress in the region is near the rock-mass frictional strength, and therefore very small perturbations of the stress field can trigger an MEQ. Our analysis shows that the most important cause for injection-induced MEQs at The Geysers is cooling and associated thermal-elastic shrinkage of the rock around the injected fluid that changes the stress state in such a way that mechanical failure and seismicity can be induced. Specifically, the cooling shrinkage results in unloading and associated loss of shear strength in critically shear-stressed fractures, which are then reactivated. Thus, our analysis shows that cooling-induced shear slip along fractures is the dominant mechanism of injection-induced MEQs at The Geysers.

An automatic data-smoothing algorithm for data from digital oscilloscopes is described. The algorithm adjusts the bandwidth of the filtering as a function of time to provide minimum mean squared error at each time. It produces an estimate of the root-mean-square error as a function of time and does so without any statistical assumptions about the unknown signal. The algorithm is based on least-squares fitting to the data of cubic spline functions.

Angle- and time-resolved two-photon photoemission (2PPE) was used to study systems of organic semiconductors on Ag(111). The 2PPE studies focused on electronic behavior specific to interfaces and ultrathin films. Electron time dynamics and band dispersions were characterized for ultrathin films of a prototypical n-type planar aromatic hydrocarbon, PTCDA, and representatives from a family of p-type oligothiophenes.In PTCDA, electronic behavior was correlated with film morphology and growth modes. Within a fewmonolayers of the interface, image potential states and a LUMO+1 state were detected. The degree to which the LUMO+1 state exhibited a band mass less than a free electron mass depended on the crystallinity of the layer. Similarly, image potential states were measured to have free electron-like effective masses on ordered surfaces, and the effective masses increased with disorder within the thin film. Electron lifetimes were correlated with film growth modes, such that the lifetimes of electrons excited into systems created by layer-by-layer, amorphous film growth increased by orders of magnitude by only a few monolayers from the surface. Conversely, the decay dynamics of electrons in Stranski-Krastanov systems were limited by interaction with the exposed wetting layer, which limited the barrier to decay back into the metal.Oligothiophenes including monothiophene, quaterthiophene, and …

As one of the measures to achieve the reduction in greenhouse gas emissions agreed to in the"Kyoto Protocol," an institutional scheme for determining energy efficiency standards for energy-consuming appliances, called the"Top-Runner Approach," was developed by the Japanese government. Its goal is to strengthen the legal underpinnings of various energy conservation measures. Particularly in Japan's residential sector, where energy demand has grown vigorously so far, this efficiency standard is expected to play a key role in mitigating both energy demand growth and the associated CO2 emissions. This paper presents an outlook of Japan's residential energy demand, developed by a stochastic econometric model for the purpose of analyzing the impacts of the Japan's energy efficiency standards, as well as the future stochastic behavior of income growth, demography, energy prices, and climate on the future energy demand growth to 2030. In this analysis, we attempt to explicitly take into consideration more than 30 kinds of electricity uses, heating, cooling and hot water appliances in order to comprehensively capture the progress of energy efficiency in residential energy end-use equipment. Since electricity demand, is projected to exhibit astonishing growth in Japan's residential sector due to universal increasing ownership of electric and other appliances, it is …

The interactions between two plant growth promoting rhizobacteria (PGPR), Pseudomonas fluorescens SBW25 and Paenibacillus brasilensis PB177, two arbuscular mycorrhizal (AM) fungi (Glomus mosseae and G. intraradices) and one pathogenic fungus (Microdochium nivale) were investigated on winter wheat (Triticum aestivum cultivar Tarso) in a greenhouse trial. PB177, but not SBW25, had strong inhibitory effects on M. nivale in dual culture plate assays. The results from the greenhouse experiment show very specific interactions; e.g. the two AM fungi react differently when interacting with the same bacteria on plants. G. intraradices (single inoculation or together with SBW25) increased plant dry weight on M. nivale infested plants, suggesting that the pathogenic fungus is counteracted by G. intraradices, but PB177 inhibited this positive effect. This is an example of two completely different reactions between the same AM fungus and two species of bacteria, previously known to enhance plant growth and inhibit pathogens. When searching for plant growth promoting microorganisms it is therefore important to test for the most suitable combination of plant, bacteria and fungi in order to get satisfactory plant growth benefits.

The measurement of flow obtained using continuous wave Doppler ultrasound is formulated as a directional projection of a flow vector field. When a continuous ultrasound wave bounces against a flowing particle, a signal is backscattered. This signal obtains a Doppler frequency shift proportional to the speed of the particle along the ultrasound beam. This occurs for each particle along the beam, giving rise to a Doppler velocity spectrum. The first moment of the spectrum provides the directional projection of the flow along theultrasound beam. Signals reflected from points further away from the detector will have lower amplitude than signals reflected from points closer to the detector. The effect is very much akin to that modeled by the attenuated Radon transform in emission computed tomography.A least-squares method was adopted to reconstruct a 2D vector field from directional projection measurements. Attenuated projections of only the longitudinal projections of the vector field were simulated. The components of the vector field were reconstructed using the gradient algorithm to minimize a least-squares criterion. This result was compared with the reconstruction of longitudinal projections of the vector field without attenuation. Ifattenuation is known, the algorithm was able to accurately reconstruct both components of the full vector …

We develop a Bayesian model to invert spectral induced polarization (SIP) data for Cole-Cole parameters using Markov chain Monte Carlo (MCMC) sampling methods. We compare the performance of the MCMC based stochastic method with an iterative Gauss-Newton based deterministic method for Cole-Cole parameter estimation through inversion of synthetic and laboratory SIP data. The Gauss-Newton based method can provide an optimal solution for given objective functions under constraints, but the obtained optimal solution generally depends on the choice of initial values and the estimated uncertainty information is often inaccurate or insufficient. In contrast, the MCMC based inversion method provides extensive global information on unknown parameters, such as the marginal probability distribution functions, from which we can obtain better estimates and tighter uncertainty bounds of the parameters than with the deterministic method. Additionally, the results obtained with the MCMC method are independent of the choice of initial values. Because the MCMC based method does not explicitly offer single optimal solution for given objective functions, the deterministic and stochastic methods can complement each other. For example, the stochastic method can first be used to obtain the means of the unknown parameters by starting from an arbitrary set of initial values and the deterministic …

CH2M HILL Hanford Group, Inc., has expanded the scope and increased the formality of process hazards analyses performed on new or modified Tank Farm facilities, designs, and processes. The CH2M HILL process hazard analysis emphasis has been altered to reflect its use as a fundamental part of the engineering and change control process instead of simply being a nuclear safety analysis tool. The scope has been expanded to include identification of accidents/events that impact the environment, or require emergency response, in addition to those with significant impact to the facility worker, the offsite, and the 100-meter receptor. Also, there is now an expectation that controls will be identified to address all types of consequences. To ensure that the process has an appropriate level of rigor and formality, a new engineering standard for process hazards analysis was created. This paper discusses the role of process hazards analysis as an information source for not only nuclear safety, but also for the worker-safety management programs, emergency management, environmental programs. This paper also discusses the role of process hazards analysis in the change control process, including identifying when and how it should be applied to changes in design or process.

The addition of storage technologies such as flow batteries, conventional batteries, and heat storage can improve the economic as well as environmental attractiveness of on-site generation (e.g., PV, fuel cells, reciprocating engines or microturbines operating with or without CHP) and contribute to enhanced demand response. In order to examine the impact of storage technologies on demand response and carbon emissions, a microgrid's distributed energy resources (DER) adoption problem is formulated as a mixed-integer linear program that has the minimization of annual energy costs as its objective function. By implementing this approach in the General Algebraic Modeling System (GAMS), the problem is solved for a given test year at representative customer sites, such as schools and nursing homes, to obtain not only the level of technology investment, but also the optimal hourly operating schedules. This paper focuses on analysis of storage technologies in DER optimization on a building level, with example applications for commercial buildings. Preliminary analysis indicates that storage technologies respond effectively to time-varying electricity prices, i.e., by charging batteries during periods of low electricity prices and discharging them during peak hours. The results also indicate that storage technologies significantly alter the residual load profile, which can contribute to lower …

To better understand the role of groundwater-level changes on rock-slope deformation and damage, a carbonate rock slope (30 m x 30 m x 15 m) was extensively instrumented for mesoscale hydraulic and mechanical measurements during water-level changes. The slope is naturally drained by a spring that can be artificially closed or opened by a water gate. In this study, a 2-hour slope-dewatering experiment was analyzed. Changes in fluid pressure and deformation were simultaneously monitored, both at discontinuities and in the intact rock, using short-base extensometers and pressure gauges as well as tiltmeters fixed at the slope surface. Field data were analyzed with different coupled hydromechanical (HM) codes (ROCMAS, FLAC{sup 3D}, and UDEC). Field data indicate that in the faults, a 40 kPa pressure fall occurs in 2 minutes and induces a 0.5 to 31 x 10{sup -6} m normal closure. Pressure fall is slower in the bedding-planes, lasting 120 minutes with no normal deformation. No pressure change or deformation is observed in the intact rock. The slope surface displays a complex tilt towards the interior of the slope, with magnitudes ranging from 0.6 to 15 x 10{sup -6} rad. Close agreement with model for both slope surface and internal measurements …

Developed linked parametric modeling tools to mathematically evaluate battery designs to satisfy challenging operational requirements for a PHEV.

Bioreduction-based strategies for remediating uranium (U)-contaminated sediments face the challenge of maintaining the reduced status of U for long times. Because groundwater influxes continuously bring in oxidizing terminal electron acceptors (O{sub 2}, NO{sub 3}{sup -}), it is necessary to continue supplying organic carbon (OC) to maintain the reducing environment after U bioreduction is achieved. We tested the influence of OC supply rates on mobility of previously microbial reduced uranium U(IV) in contaminated sediments. We found that high degrees of U mobilization occurred when OC supply rates were high, and when the sediment still contained abundant Fe(III). Although 900 days with low levels of OC supply minimized U mobilization, the sediment redox potential increased with time as did extractable U(VI) fractions. Molecular analyses of total microbial activity demonstrated a positive correlation with OC supply and analyses of Geobacteraceae activity (RT-qPCR of 16S rRNA) indicated continued activity even when the effluent Fe(II) became undetectable. These data support our earlier hypothesis on the mechanism responsible for re-oxidation of microbial reduced U(IV) under reducing conditions; that microbial respiration caused increased (bi)carbonate concentrations and formation of stable uranyl carbonate complexes, thereby shifted U(IV)/U(VI) equilibrium to more reducing potentials. The data also suggested that low OC …

Well blowout rates in oil fields undergoing thermally enhanced recovery (via steam injection) in California Oil and Gas District 4 from 1991 to 2005 were on the order of 1 per 1,000 well construction operations, 1 per 10,000 active wells per year, and 1 per 100,000 shut-in/idle and plugged/abandoned wells per year. This allows some initial inferences about leakage of CO2 via wells, which is considered perhaps the greatest leakage risk for geological storage of CO2. During the study period, 9% of the oil produced in the United States was from District 4, and 59% of this production was via thermally enhanced recovery. There was only one possible blowout from an unknown or poorly located well, despite over a century of well drilling and production activities in the district. The blowout rate declined dramatically during the study period, most likely as a result of increasing experience, improved technology, and/or changes in safety culture. If so, this decline indicates the blowout rate in CO2-storage fields can be significantly minimized both initially and with increasing experience over time. Comparable studies should be conducted in other areas. These studies would be particularly valuable in regions with CO2-enhanced oil recovery (EOR) and natural gas …