291 research outputs found

    Impacts of the changes made to solar net metering by northern California community choice aggregators

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    When Northern California Community Choice Aggregation Programs (CCAs) took over the role of sourcing electricity from the incumbent utility (Pacific Gas and Electric, or PG&E), they also made changes to how solar customers were treated. In the Humboldt, Sonoma, Marin, and San Mateo County regions, solar customers that were net exporters of electricity received an additional 0.01/kWhcreditonthegenerationportionoftheirbill.ThispolicyisinheritedfromoneCCAtoanother,and,giventheCCAsareprojectedtoserve18millionCaliforniansby2020(CalCCA,2018),understandingitsimpactonasolarcustomer2˘7sbottomlineandonthelocalsolarmarketiscriticalforthefutureofthevibrantCaliforniasolarindustry.WhenahypotheticalNorthernCaliforniaresidentialcustomerwithtypicalelectricityconsumptioninstallsasystemthatoffsets1000.01/kWh credit on the generation portion of their bill. This policy is inherited from one CCA to another, and, given the CCAs are projected to serve 18 million Californians by 2020 (Cal CCA, 2018), understanding its impact - on a solar customer\u27s bottom line and on the local solar market - is critical for the future of the vibrant California solar industry. When a hypothetical Northern California residential customer with typical electricity consumption installs a system that offsets 100% of their annual load, the Humboldt County approach provides an estimated 13/year in additional value (in the form of end-of-year bill credits) relative to a bundled PG&E customer. When that annual load offset is raised to 110%, the Humboldt County approach provides an additional estimated $32/year. An analysis of the number residential solar installations before and after a CCA\u27s implementation could not isolate them as a factor that grew the local solar market; average monthly installs rose, but that increase was strongly correlated with broader trends, including falling costs. Interviews with solar contractors revealed that, while viewed as a positive gesture, this policy has not been proven to move the financial needle for potential customers

    Social Media for Cities, Counties and Communities

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    Social media (i.e., Twitter, Facebook, Flickr, YouTube) and other tools and services with user- generated content have made a staggering amount of information (and misinformation) available. Some government officials seek to leverage these resources to improve services and communication with citizens, especially during crises and emergencies. Yet, the sheer volume of social data streams generates substantial noise that must be filtered. Potential exists to rapidly identify issues of concern for emergency management by detecting meaningful patterns or trends in the stream of messages and information flow. Similarly, monitoring these patterns and themes over time could provide officials with insights into the perceptions and mood of the community that cannot be collected through traditional methods (e.g., phone or mail surveys) due to their substantive costs, especially in light of reduced and shrinking budgets of governments at all levels. We conducted a pilot study in 2010 with government officials in Arlington, Virginia (and to a lesser extent representatives of groups from Alexandria and Fairfax, Virginia) with a view to contributing to a general understanding of the use of social media by government officials as well as community organizations, businesses and the public. We were especially interested in gaining greater insight into social media use in crisis situations (whether severe or fairly routine crises, such as traffic or weather disruptions)

    SoyBase, the USDA-ARS soybean genetics and genomics database

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    SoyBase, the USDA-ARS soybean genetic database, is a comprehensive repository for professionally curated genetics, genomics and related data resources for soybean. SoyBase contains the most current genetic, physical and genomic sequence maps integrated with qualitative and quantitative traits. The quantitative trait loci (QTL) represent more than 18 years of QTL mapping of more than 90 unique traits. SoyBase also contains the well-annotated ‘Williams 82’ genomic sequence and associated data mining tools. The genetic and sequence views of the soybean chromosomes and the extensive data on traits and phenotypes are extensively interlinked. This allows entry to the database using almost any kind of available information, such as genetic map symbols, soybean gene names or phenotypic traits. SoyBase is the repository for controlled vocabularies for soybean growth, development and trait terms, which are also linked to the more general plant ontologies. SoyBase can be accessed at http://soybase.org

    Applying Small-Scale DNA Signatures as an Aid in Assembling Soybean Chromosome Sequences

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    Previous work has established a genomic signature based on relative counts of the 16 possible dinucleotides. Until now, it has been generally accepted that the dinucleotide signature is characteristic of a genome and is relatively homogeneous across a genome. However, we found some local regions of the soybean genome with a signature differing widely from that of the rest of the genome. Those regions were mostly centromeric and pericentromeric, and enriched for repetitive sequences. We found that DNA binding energy also presented large-scale patterns across soybean chromosomes. These two patterns were helpful during assembly and quality control of soybean whole genome shotgun scaffold sequences into chromosome pseudomolecules

    Changes in Twelve Homoeologous Genomic Regions in Soybean following Three Rounds of Polyploidy

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    With the advent of high-throughput sequencing, the availability of genomic sequence for comparative genomics is increasing exponentially. Numerous completed plant genome sequences enable characterization of patterns of the retention and evolution of genes within gene families due to multiple polyploidy events, gene loss and fractionation, and differential evolutionary pressures over time and across different gene families. In this report, we trace the changes that have occurred in 12 surviving homoeologous genomic regions from three rounds of polyploidy that contributed to the current Glycine max genome: a genome triplication before the origin of the rosids (;130 to 240 million years ago), a genome duplication early in the legumes (;58 million years ago), and a duplication in the Glycine lineage (;13 million years ago). Patterns of gene retention following the genome triplication event generally support predictions of the Gene Balance Hypothesis. Finally, we find that genes in networks with a high level of connectivity are more strongly conserved than those with low connectivity and that the enrichment of these highly connected genes in the 12 highly conserved homoeologous segments may in part explain their retention over more than 100 million years and repeated polyploidy events

    Potential application of hydrogen in traumatic and surgical brain injury, stroke and neonatal hypoxia-ischemia

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    This article summarized findings of current preclinical studies that implemented hydrogen administration, either in the gas or liquid form, as treatment application for neurological disorders including traumatic brain injury (TBI), surgically induced brain injury (SBI), stroke, and neonatal hypoxic-ischemic brain insult (HI). Most reviewed studies demonstrated neuroprotective effects of hydrogen administration. Even though anti-oxidative potentials have been reported in several studies, further neuroprotective mechanisms of hydrogen therapy remain to be elucidated. Hydrogen may serve as an adjunct treatment for neurological disorders

    Analysis of ``Gauge Modes'' in Linearized Relativity

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    By writing the complete set of 3+13 + 1 (ADM) equations for linearized waves, we are able to demonstrate the properties of the initial data and of the evolution of a wave problem set by Alcubierre and Schutz. We show that the gauge modes and constraint error modes arise in a straightforward way in the analysis, and are of a form which will be controlled in any well specified convergent computational discretization of the differential equations.Comment: 11pages LaTe

    Applying Small-Scale DNA Signatures as an Aid in Assembling Soybean Chromosome Sequences

    Get PDF
    Previous work has established a genomic signature based on relative counts of the 16 possible dinucleotides. Until now, it has been generally accepted that the dinucleotide signature is characteristic of a genome and is relatively homogeneous across a genome. However, we found some local regions of the soybean genome with a signature differing widely from that of the rest of the genome. Those regions were mostly centromeric and pericentromeric, and enriched for repetitive sequences. We found that DNA binding energy also presented large-scale patterns across soybean chromosomes. These two patterns were helpful during assembly and quality control of soybean whole genome shotgun scaffold sequences into chromosome pseudomolecules
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