1,674 research outputs found
Ruggedized Color Measurement for Beer, Wort, and Malt
The standard instrument for measuring malt, wort, and beer color is the spectrophotometer. Spectrophotometers are not rugged; they have critically aligned collimators, monochromators, lenses, slits, and mirrors that make them difficult to use and maintain in a production environment. Our research shows that wort and beer color can be measured accurately with rugged equipment based on light emitting diodes (LEDs) with results in agreement with those of a spectrophotometer. Two or more colored diodes were used. LED-based apparatus does not require critical alignment, is not highly sensitive to environmental conditions such as temperature, moisture, dust, and vibration, and can be rapid, inexpensive, compact, rugged, and easy to use. Statistical comparison in the range of 1–9 °SRM shows an insignificant bias for (SRM–LED) of −0.06 ± 0.4 °SRM. The intraclass correlation coefficient for the differences was 0.9952
Current Distribution Based Power Module Screening by New Normal/Abnormal Classification Method with Image Processing
We developed a screening equipment for ceramic substrate level power module of IGBT. The equipment realizes a new screening test with current distribution. The equipment acquires magnetic field signals over bonding wires and finally classifies to normal/abnormal module automatically. We established statistics based normal/abnormal classification with image processing. It is expected to be applied for screening in a production line and analysis to prevent the failure of power modules.2017 29th International Symposium on Power Semiconductor Devices and IC\u27s (ISPSD), May 28 2017-June 1 2017, Sapporo, Japa
Observation of band crossings protected by nonsymmorphic symmetry in the layered ternary telluride Ta3SiTe6
We have performed angle-resolved photoemission spectroscopy of layered
ternary telluride Ta3SiTe6 which is predicted to host nodal lines associated
with nonsymmorphic crystal symmetry. We found that the energy bands in the
valence-band region show Dirac-like dispersions which present a band degeneracy
at the R point of the bulk orthorhombic Brillouin zone. This band degeneracy
extends one-dimensionally along the whole SR high-symmetry line, forming the
nodal lines protected by the glide mirror symmetry of the crystal. We also
observed a small band splitting near EF which supports the existence of
hourglass-type dispersions predicted by the calculation. The present results
provide an excellent opportunity to investigate the interplay between exotic
nodal fermions and nonsymmorphic crystal symmetry.Comment: 6 pages, 4 figure
A case of Bickerstaff's brainstem encephalitis in childhood
Bickerstaff's brainstem encephalitis (BBE) is a rare disease diagnosed by specific clinical features such as 'progressive, relatively symmetric external ophthalmoplegia and ataxia by 4 weeks' and 'disturbance of consciousness or hyperreflexia' after the exclusion of other diseases involving the brain stem. Anti-ganglioside antibodies (GM, GD and GQ) in the serum or cerebrospinal fluid (CSF) are sometimes informative for the diagnosis of BBE because of the rarity of positive findings in other diagnositic methods: brain magnetic resonance imaging (MRI), routine CSF examination, motor nerve conduction study, and needle electromyography. We report a rare case of childhood BBE with elevated anti-GM1 antibodies in the serum, who had specific clinical symptoms such as a cranial polyneuropathy presenting as ophthalmoplegia, dysarthria, dysphagia, and facial weakness; progressive motor weakness; altered mental status; and ataxia. However, the brain MRI, routine CSF examination, nerve conduction studies, electromyography, somatosensory evoked potentials, and brainstem auditory evoked potentials were normal. BBE was suspected and the patient was successfully treated with intravenous immunoglobulins
Topological Unwinding in an Exciton-Polariton Condensate Array
The phase distribution in a Bose-Einstein condensate can realize various
topological states which can be classified according to distinct winding
numbers. While states with different winding numbers are topologically
protected in the linear Schr\"odinger equation, when nonlinearities are
introduced, violations of the topological protection can occur, leading to
unwinding. Exciton-polariton condensates constitute a weakly nonlinear open
dissipative system that is well suited to studying such physics. Here we show
that exciton-polariton condensates display a spontaneous phase unwinding from a
- to zero-state. While such an effect was previously observed in a
one-dimensional polariton-condensate array and explained as occurring due to
single-particle mode competition, we offer a new explanation in terms of
collective phase unwinding of metastable states. We clarify that the collective
transition is caused by the combined effect of nonlinearity and topological
defects in the condensates. Reanalyzing the experimental data, we find an
evidence of the collective phase unwinding.Comment: 8+4 pages, 4+1 figure
Dynamics of moire trion and its valley polarization in microfabricated WSe2/MoSe2 heterobilayer
The moire potential, induced by stacking two monolayer semiconductors with
slightly different lattice mismatches, acts as periodic quantum confinement for
optically generated excitons, resulting in spatially ordered zero-dimensional
quantum systems. However, there are limitations to exploring intrinsic optical
properties of moire excitons due to ensemble averaged and broadened emissions
from many peaks caused by the inhomogeneity of the moire potential. In this
study, we proposed a microfabrication technique based on focused Ga+ ion beams,
which enables us to control the number of peaks originating from the moire
potential and thus explore unknown moire optical characteristics of WSe2/MoSe2
heterobilayers. By taking advantage of this approach, we reveal emissions from
a single moire exciton and charged moire exciton (trion) under electrostatic
doping conditions. We show the momentum dark moire trion state above the bright
trion state with a splitting energy of approximately 4 meV and clarify that the
dynamics are determined by the initial trion population in the bright state.
Furthermore, the degree of negative circularly polarized emissions and their
valley dynamics of moire trions are dominated by a very long valley relaxation
process lasting ~700 ns. Our findings on microfabricated heterobilayers could
be viewed as an extension of our groundbreaking efforts in the field of quantum
optics application using moire superlattices.Comment: 41 pages, 4 figure
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