Transparent conducting oxides (TCOs) are a critical element in photovoltaic devices. This paper describes research on Ga:ZnO (a TCO candidate) using a high-throughput combinatorial approach.

This report discusses the infectious disease outbreaks, such as H5N1 avian influenza and severe acute respiratory syndrome (SARS), and tuberculosis (TB). The World Health Organization (WHO) estimates that someone contracts TB every second and that about one-third of all people in the world carry TB; most of these cases, however, are latent

Testimony issued by the Government Accountability Office with an abstract that begins "The United States Capitol Police (USCP) is responsible for securing the 276-acre Capitol Complex, including protecting Members of Congress, visitors, and congressional facilities. In response to heightened security concerns, various requests, and legislative mandates over the years, GAO has reported on management control problems in five key areas: (1) establishing an accountability framework for monitoring recommendations, (2) establishing a risk management framework, (3) ensuring financial management, (4) ensuring strategic and human capital planning, and (5) managing information technology (IT). From January 2004 through March 2007, GAO made 46 recommendations aimed at improving USCP administrative and management operations and achieving strategic goals. This testimony reports on the status of USCP's efforts to address GAO's recommendations. To conduct its work, GAO analyzed USCP documentation, such as risk matrices, budget documents, and strategic plans. GAO also conducted interviews with USCP officials and contractors on their efforts related to its recommendations. GAO performed this work from October 2007 through April 2008. USCP generally agreed with GAO's 46 prior recommendations and GAO's assessment of the status of USCP's efforts to implement those recommendations. Along these lines, USCP needs to complete those actions in …

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This brochure describes the top ten accompishments of the DOE Wind Energy Program during the past 30 years.

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The aim of this study was to enrich and identify psychrotolerant phenanthrenedegrading bacteria from polluted Baltic Sea sediments. Polyaromatic hydrocarbon (PAH)-contaminated sediments were spiked with phenanthrene and incubated for 2 months in the presence of bromodeoxyuridine that is incorporated into the DNA of replicating cells. The bromodeoxyuridine-incorporated DNA was extracted by immunocapture and analyzed by terminal-restriction fragment length polymorphism and 16S rRNA gene cloning and sequencing to identify bacterial populations that were growing. In addition, degradation genes were quantified in the bromodeoxyuridine-incorporated DNA by real-time PCR. Phenanthrene concentrations decreased after 2 months of incubation in the phenanthrene-enriched sediments and this reduction correlated to increases in copy numbers of xylE and phnAc dioxygenase genes. Representatives of Exiguobacterium, Schewanella,Methylomonas, Pseudomonas, Bacteroides and an uncultured Deltaproteobacterium and a Gammaproteobacterium dominated the growing community in the phenanthrene spiked sediments. Isolates that were closely related to three of these bacteria (two pseudomonads and an Exiguobacterium sp.) could reduce phenanthrene concentrations in pure cultures and they all harbored phnAc dioxygenase genes. These results confirm that this combination of culture-based and molecular approaches was useful for identification of actively growing bacterial species with a high potential for phenanthrene degradation.

Cloud droplet size distributions hence the key microphysical quantities (e.g., radar reflectivity, droplet concentration, liquid water content, relative dispersion, and mean-volume radius) are determined by different physical mechanisms, including pre-cloud aerosols as CCNs, cloud updraft, and various turbulent entrainment-mixing processes. Therefore, different relationships among these microphysical properties are expected in response to these various mechanisms. The effect of turbulent entrainment-mixing processes is particularly vexing, with different entrainment-mixing processes likely leading to different microphysical relationships. Cloud radar has been widely used to infer the cloud liquid water content (L) from the measurement of radar reflectivity (Z) using a Z-L relationship. Existing Z-L expressions have been often obtained empirically, and differ substantially (Khain et al. 2008). The discrepancy among Z-L relations, which has been hindering the application of cloud radar in measuring cloud properties, likely stems from the different relationships between the relevant microphysical properties caused by different physical processes. This study first analyzes the Z-L relationship theoretically, and identify the key microphysical properties that affect this relationship, and then address the effects of various processes on the Z-L relationship by discerning the characteristics of the relationships between the relative dispersion, droplet concentration, liquid water content, and mean-volume radius calculated from in-situ …

This users manual describes how to obtain and interpret the data in the Typical Meteorological Year version 3 (TMY3) data sets. These data sets are an update to the TMY2 data released by NREL in 1994.

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Testimony issued by the Government Accountability Office with an abstract that begins "Under the Public Utility Holding Company Act of 1935 (PUHCA 1935) and other laws, federal agencies and state commissions have traditionally regulated utilities to protect consumers from supply disruptions and unfair pricing. The Energy Policy Act of 2005 (EPAct) repealed PUHCA 1935, removing some limitations on the companies that could merge with or invest in utilities, and leaving the Federal Energy Regulatory Commission (FERC), which already regulated utilities, with primary federal responsibility for regulating them. Because of the potential for new mergers or acquisitions between utilities and companies previously restricted from investing in utilities, there has been considerable interest in whether cross-subsidization--unfairly passing on to consumers the cost of transactions between utility companies and their "affiliates"--could occur. GAO was asked to testify on its February 2008 report, Utility Oversight: Recent Changes in Law Call for Improved Vigilance by FERC (GAO-08-289), which (1) examined the extent to which FERC changed its merger review and post merger oversight since EPAct to protect against cross-subsidization and (2) surveyed state utility commissions about their oversight. In this report, GAO recommended that FERC adopt a risk-based approach to auditing and improve its audit …

This paper describes reasons that lifetime measurments may be irreproducible using iodine-in-ethanol (I-E) passivation. Possible factors include the strength of the iodine in ethanol solution, wafer cleaning procedures, influence of wafer container during lifetime measurement, and stability of I-E.

Measurement of the bulk minority-carrier lifetime (T{sub b}) by optical methods, such as photocurrent decay or quasi-steady-state photoconductance (QSSPC), is strongly influenced by surface recombination. Several techniques are known to lower the effective surface recombination velocity, including the following: use of oxidation, floating N/P junction, SiN:H layer, HF immersion, and use of iodine in ethanol or methanol (I-E solution). Using I-E appears to be very simple and does not require any high-temperature treatment such as oxidation, diffusion, or nitridation processes, which can change T{sub b}. However, this is not a preferred procedure within the photovoltaic community because it is difficult to obtain same T{sub b} values reproducibly, particularly when the wafer lifetime is long. The objectives are: (1) Investigate various reasons why lifetime measurements may be irreproducible using I-E solution passivation. (2) Study the influence of the strength of iodine in the ethanol solution, wafer-cleaning procedures, influence of the wafer container during lifetime measurements, and the stability of I-E. (3) Compare lifetimes of wafers (having different T{sub b}) by various techniques such as QSSPC and transient photoconductive decay using short laser pulses of different light intensity; (4) Make minority-carrier diffusion length (L) measurements by a surface photovoltage technique, and to …

Characterizing flow patterns and mixing of fossil fuel-derived CO{sub 2} is important for effectively using atmospheric measurements to constrain emissions inventories. Here we used measurements and a model of atmospheric radiocarbon ({sup 14}C) to investigate the distribution and fluxes of atmospheric fossil fuel CO{sub 2} across the state of California. We sampled {sup 14}C in annual C{sub 3} grasses at 128 sites and used these measurements to test a regional model that simulated anthropogenic and ecosystem CO{sub 2} fluxes, transport in the atmosphere, and the resulting {sup 14}C of annual grasses ({Delta}{sub g}). Average measured {Delta}{sub g} in Los Angeles, San Francisco, the Central Valley, and the North Coast were 27.7 {+-} 20.0, 44.0 {+-} 10.9, 48.7 {+-} 1.9, and 59.9 {+-} 2.5{per_thousand}, respectively, during the 2004-2005 growing season. Model predictions reproduced regional patterns reasonably well, with estimates of 27.6 {+-} 2.4, 39.4 {+-} 3.9, 46.8 {+-} 3.0, and 59.3 {+-} 0.2{per_thousand} for these same regions and corresponding to fossil fuel CO{sub 2} mixing ratios (Cf) of 13.7, 6.1, 4.8, and 0.3 ppm. {Delta}{sub g} spatial heterogeneity in Los Angeles and San Francisco was higher in the measurements than in the predictions, probably from insufficient spatial resolution in the fossil …

This report discusses the disputes over Corps jurisdiction prior to enactment of the Energy Policy Act of 2005 as well as the current law applicable to siting offshore wind facilities.

This report will discuss the disputes over the Army Corps of Engineers (Corps) jurisdiction prior to enactment of the Energy Policy Act of 2005 as well as the current law applicable to siting offshore wind facilities.

This brochure describes the benefits of wind energy and the Wind Powering America Program.

Conducted extensive wind-tunnel tests on parabolic trough solar collectors to determine practical wind loads applicable to structural design for stress and deformation, and local component design for concentrator reflectors.

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Cu(In,Ga)Se2 (CIGS) photovoltaic (PV) cells require a highly conducting and transparent electrode for optimum device performance. ZnO:Al films grown from targets containing 2.0 wt.% Al2O3 are commonly used for this purpose. Maximum carrier mobilities of these films grown at room temperature are ~20-25 cm2V-1s-1. Therefore, relatively high carrier concentrations are required to achieve the desired conductivity, which leads to free carrier absorption in the near infrared (IR). Lightly doped films (0.05 - 0.2 wt.% Al2O3), which show less IR absorption, reach mobility values greater than 50 cm2V-1s-1 when deposited in H2 partial pressure. We incorporate these lightly doped ZnO:Al layers into CIGS PV cells produced at the National Renewable Energy Laboratory (NREL). Preliminary results show quantum efficiency values of these cells rival those of a past world-record cell produced at NREL that used 2.0 wt.% Al-doped ZnO films. The highest cell efficiency obtained in this trial was 18.1%.