Rapid reduction in the price of photovoltaic (solar PV) cells and modules has resulted in a rapid increase in solar system deployments to an annual expected capacity of 200 GW by 2020. Achieving high ...PV cell and module efficiency is necessary for many solar manufacturers to break even. In addition, new innovative installation methods are emerging to complement the drive to lower $/W PV system price. The floating PV (FPV) solar market space has emerged as a method for utilizing the cool ambient environment of the FPV system near the water surface based on successful FPV module (FPVM) reliability studies that showed degradation rates below 0.5% p.a. with new encapsulation material. PV module temperature analysis is another critical area, governing the efficiency performance of solar cells and module. In this paper, data collected over five-minute intervals from a PV system over a year is analyzed. We use MATLAB to derived equation coefficients of predictable environmental variables to derive FPVM’s first module temperature operation models. When comparing the theoretical prediction to real field PV module operation temperature, the corresponding model errors range between 2% and 4% depending on number of equation coefficients incorporated. This study is useful in validation results of other studies that show FPV systems producing 10% more energy than other land based systems.
IMPLICIT BIAS IN THE AGE OF TRUMP Lawrence, Charles R.
Harvard Law Review,
05/2020, Letnik:
133, Številka:
7
Book Review, Journal Article
Recenzirano
Book Review: 'Biased: Uncovering the hidden prejudice that shapes what we see, think, and do', By Jennifer L. Eberhardt. New York, N.Y.: Viking. 2019. Pp. 340. $28.00.
Benthic δ18O stacks are the benchmarks by which paleoceanographic data are stratigraphically aligned and compared. However, a recent study found that between 1.8 and 1.9 million years ago (Ma) ...several Ceara Rise records differed substantially from the widely used LR04 global stack. Here, we use new Bayesian stacking software to construct regional stacks and demonstrate a geographical divergence in benthic δ18O features from 1.8 to 1.9 Ma. The pattern of isotopic stage features observed in the Ceara Rise is widespread throughout the Atlantic and differs notably from Pacific records. We propose that this regional difference in isotopic stages may be the result of relatively strong precession forcing and weaker obliquity forcing between 1.8 and 1.9 Ma. In accordance with the Antiphase Hypothesis, our results highlight a period of apparent sensitivity to regional precession forcing that is masked during most of the 41‐Kyr world due to the amplitude modulation of obliquity forcing.
Plain Language Summary
To determine the age of deep‐sea sediments, often the oxygen isotope ratios of microfossils are measured and compared to a previously compiled global benchmark. Recently, one of the most widely used oxygen isotope benchmarks has been challenged based on a comparison with several Atlantic records. In this study we assess several lines of evidence including utilizing newly available data and software. We confirm the challenge to the global oxygen isotope benchmark and find that it is more widespread than originally realized. Particularly, we find that oxygen isotope records display different patterns between the Atlantic and Pacific Oceans from 1.8 to 1.9 million years ago (Ma). We propose that this difference is the result of the opposing seasonal solar radiation anomalies received by the northern and southern hemispheres, which exhibited particularly large amplitudes during this time. Our study adds supporting evidence to a hypothesis that explains the dominant frequency of oxygen isotopic cycles from 1.2 to 2.6 Ma.
Key Points
New Atlantic and Pacific benthic δ18O stacks show different patterns between 1.8 and 1.9 Ma
The Atlantic‐Pacific difference in this portion of the 41‐Kyr world may be caused by regional sensitivity to relatively strong precession
Regional benthic δ18O stacks are preferable to global stacks for stratigraphic alignment
Non-allelic homologous recombination (NAHR) is a common mechanism for generating genome rearrangements and is implicated in numerous genetic disorders, but its detection in high-throughput sequencing ...data poses a serious challenge. We present a probabilistic model of NAHR and demonstrate its ability to find NAHR in low-coverage sequencing data from 44 individuals. We identify NAHR-mediated deletions or duplications in 109 of 324 potential NAHR loci in at least one of the individuals. These calls segregate by ancestry, are more common in closely spaced repeats, often result in duplicated genes or pseudogenes, and affect highly studied genes such as GBA and CYP2E1.
The accurate and thorough genome-wide detection of adenosine-to-inosine editing, a biologically indispensable process, has proven challenging. Here, we present a discovery pipeline in adult ...Drosophila, with 3,581 high-confidence editing sites identified with an estimated accuracy of 87%. The target genes and specific sites highlight global biological properties and functions of RNA editing, including hitherto-unknown editing in well-characterized classes of noncoding RNAs and 645 sites that cause amino acid substitutions, usually at conserved positions. The spectrum of functions that these gene targets encompass suggests that editing participates in a diverse set of cellular processes. Editing sites in Drosophila exhibit sequence-motif preferences and tend to be concentrated within a small subset of total RNAs. Finally, editing regulates expression levels of target mRNAs and strongly correlates with alternative splicing.
A common transcriptome assembly error is to mistake different transcripts of the same gene as transcripts from multiple closely related genes. This error is difficult to identify during assembly, but ...in a phylogenetic analysis such errors can be diagnosed from gene phylogenies where they appear as clades of tips from the same species with improbably short branch lengths. treeinform is a method that uses phylogenetic information across species to refine transcriptome assemblies within species. It identifies transcripts of the same gene that were incorrectly assigned to multiple genes and reassign them as transcripts of the same gene. The treeinform method is implemented in Agalma, available at https://bitbucket.org/caseywdunn/agalma, and the general approach is relevant in a variety of other contexts.
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