61 research outputs found
Conceptual Design and Analysis of No-Insulation High-Temperature Superconductor Tubular Wave Energy Converter
So far, a number of wave energy converters (WEC) have been proposed to
increase efficiency and economic feasibility. Particularly, tubular WEC with
permanent magnets and coil winding packs is mostly used to convert the wave
energy. Due to the demand for high magnetic flux density in WEC, research has
been conducted on high-temperature superconductors (HTS) WEC. In this paper,
the conceptual design of no-insulation (NI) HTS tubular WEC and its
optimization process are proposed. Using NI technology, it has become possible
to design WEC with high volumetric efficiency and cost-effectiveness.
Furthermore, the design is analyzed in the aspect of electromagnetism,
mechanical force, and cryogen. The performance of the proposed WEC is evaluated
as a response to various waveforms and their amplitudes. A rectifying circuit
of WEC connected in parallel with load resistance is used for the output power
study
Update on form factor at zero-recoil using the Oktay-Kronfeld action
We present an update on the calculation of
semileptonic form factor at zero recoil using the Oktay-Kronfeld bottom and
charm quarks on flavor HISQ ensembles generated by the MILC
collaboration. Preliminary results are given for two ensembles with and fm and MeV. Calculations have been done
with a number of valence quark masses, and the dependence of the form factor on
them is investigated on the fm ensemble. The excited state is
controlled by using multistate fits to the three-point correlators measured at
4--6 source-sink separations.Comment: 7 pages and 4 figures. Talk at The 36th Annual International
Symposium on Lattice Field Theory - LATTICE201
Calculation of BSM Kaon B-parameters using Staggered Quarks
We present updated results for kaon B-parameters for operators arising in
models of new physics. We use HYP-smeared staggered quarks on the
MILC asqtad lattices. During the last year we have added new ensembles, which
has necessitated chiral-continuum fitting with more elaborate fitting
functions. We have also corrected an error in a two-loop anomalous dimension
used to evolve results between different scales. Our results for the
beyond-the-Standard-Model B-parameters have total errors of \%. We find
that the discrepancy observed last year between our results and those of the
RBC/UKQCD and ETM collaborations for some of the B-parameters has been reduced
from to .Comment: 7 pages, 8 figures, Lattice 2014 proceedin
Denitrifying Bacteria Active in Woodchip Bioreactors at Low-Temperature Conditions
Woodchip bioreactor technology removes nitrate from agricultural subsurface drainage by using denitrifying microorganisms. Although woodchip bioreactors have demonstrated success in many field locations, low water temperature can significantly limit bioreactor efficiency and performance. To improve bioreactor performance, it is important to identify the microbes responsible for nitrate removal at low temperature conditions. Therefore, in this study, we identified and characterized denitrifiers active at low-temperature conditions by using culture-independent and -dependent approaches. By comparative 16S rRNA (gene) analysis and culture isolation technique, Pseudomonas spp., Polaromonas spp., and Cellulomonas spp. were identified as being important bacteria responsible for denitrification in woodchip bioreactor microcosms at relatively low temperature conditions (15°C). Genome analysis of Cellulomonas sp. strain WB94 confirmed the presence of nitrite reductase gene nirK. Transcription levels of this nirK were significantly higher in the denitrifying microcosms than in the non-denitrifying microcosms. Strain WB94 was also capable of degrading cellulose and other complex polysaccharides. Taken together, our results suggest that Cellulomonas sp. denitrifiers could degrade woodchips to provide carbon source and electron donors to themselves and other denitrifiers in woodchip bioreactors at low-temperature conditions. By inoculating these denitrifiers (i.e., bioaugmentation), it might be possible to increase the nitrate removal rate of woodchip bioreactors at low-temperature conditions
- …