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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 1,261 records · Page 70
All sourcesNASA NTRSDOE OSTI
DOE OSTI2011

PHENIX study of dihadron correlations in Au plus Au collisions at root s(NN)=200 GeV: jet quenching and medium response

We provide a detailed survey study of dihadron azimuthal angle ({Delta}{phi}) correlations in a broad range of transverse momentum (0.4 < p{sub T} < 10 GeV/c) and centrality (0-92%) in Au+Au collisions at {radical}s{sub NN} = 200 GeV. The evolution of the jet shape and yield with p{sub T} seems to suggest two distinct components at the away-side pairs: a suppressed jet fragmentation component around {Delta}{phi} {approx} {pi}, and a medium-induced components around |{Delta}{phi}-{pi}| {approx} 1.1. The former dominates p{sub T} > 5 GeV/c and the later dominates at p{sub T} < 4 GeV/c.

73 NUCLEAR PHYSICS AND RADIATION PHYSICS↗
DOE OSTI2011

PHENIX study of dihadron Delta eta correlation in Au plus Au collision at root s(NN)=200 GeV: the ridge

We show the recent study of the ridge phenomena by PHENIX Collaboration over a broad transverse momentum (p{sub T}) range. Properties of the ridge are extracted in terms of its shape in {Delta}{phi} and {Delta}{eta}, and its yield. These properties are found to be similar to the away-side modification in the same p{sub T} range, suggesting a related modification mechanisms in both the near- and away-side.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2022

The W4 method: A new multi-dimensional root-finding scheme for nonlinear systems of equations

We propose a new class of method for solving nonlinear systems of equations, which, among other things, has four nice features: (i) it is inspired by the mathematical property of damped oscillators, (ii) it can be regarded as a simple extension to the Newton-Raphson (NR) method, (iii) it has the same local convergence as the NR method does, (iv) it has a significantly wider convergence region or the global convergence than that of the NR method. In this article, we present the evidence of these properties, applying our new method to some examples and comparing it with the NR method.

97 MATHEMATICS AND COMPUTING↗
DOE OSTI2018

A putative cyclin, SiPHO80 from root endophytic fungus Serendipita indica regulates phosphate homeostasis, salinity and heavy metal toxicity tolerance

Highlights: • SiPHO80 of S. indica gets upregulated in high Phosphate condition. • SiPHO80 restores Pi homeostasis in S. cerevisiae PHO80 mutants. • SiPHO80 rescues S. cerevisiae PHO80 mutants in salinity stress and heavy metal toxicity. Serendipita indica previously known as Piriformospora indica is an arbuscular mycorrhizal fungi (AMF) like endophytic fungus which can be cultivated axenically and colonizes an array of plants, thereby promoting their growth and confers biotic and abiotic stress tolerance to the colonized host plant. It efficiently sequestrates heavy metals and defends host plant against heavy metal-induced toxicity. In the present study, SiPHO80, a homologue of S. cerevisiae PHO80 was isolated from S. indica and functionally characterized in S. cerevisiae. SiPHO80 has conserved ‘cyclin box’ domain and closely related to negative regulator cyclin of the wood decaying fungi. In S. indica, its expression gets upregulated in phosphate-rich media. The regulation of Pi homeostasis which was disrupted in S. cerevisiae Δpho80 grown under high Pi condition was restored upon complementation with SiPHO80. Also, the expression of SiPHO80 in Δpho80 mutant restored osmotolerance and heavy metal tolerance. This is the first report of a cyclin which is involved in Pi homeostasis, salt tolerance, heavy metal toxicity tolerance in any plant growth promoting endophytic fungi.

60 APPLIED LIFE SCIENCES↗