2,881 research outputs found
Hydraulic device provides accurate displacements to microinches
Hydraulic drive device translates microinch deviation measurements into precise corrective displacements. The unit is driven by a servomotor activated by the output of an attitude sensing device
Hydraulic drive mechanism Patent
Hydraulic drive mechanism for leveling isolation platform
Giant magnetoresistance in Co/Cu multilayers sputtered with Kr
This paper presents some results of magnetoresistance measurements on Kr-sputter-deposited Co/Cu multilayers. We find that Co/Cu MLs sputtered with Kr gas show a larger GMR effect than those sputtered with Ar gas
Majorana bound state in rotating superfluid 3He-A between parallel plates
A concrete and experimentally feasible example for testing the putative
Majorana zero energy state bound in a vortex is theoretically proposed for a
parallel plate geometry of superfluid He-A phase. We examine the
experimental setup in connection with ongoing rotating cryostat experiments.
The theoretical analysis is based on the well-established Ginzburg--Landau
functional, supplemented by microscopic calculations of the Bogoliubov--de
Gennes equation, both of which allow the precise location of the parameter
regions of the Majorana state to be found in realistic situations.Comment: 5 pages, 4 figure
Spontaneous mass current and textures of p-wave superfluids of trapped Fermionic atom gases at rest and under rotation
It is found theoretically based on the Ginzburg-Landau framework that p-wave
superfluids of neutral atom gases in three dimension harmonic traps exhibit
spontaneous mass current at rest, whose direction depends on trap geometry.
Under rotation various types of the order parameter textures are stabilized,
including Mermin-Ho and Anderson-Toulouse-Chechetkin vortices. In a cigar shape
trap spontaneous current flows longitudial to the rotation axis and thus
perpendicular to the ordinary rotational current. These features, spontaneous
mass current at rest and texture formation, can be used as diagnoses for p-wave
superfluidity.Comment: 5 pages, 5 figure
Stability of half quantum vortex in rotating superfluid 3He-A between parallel plates
We have found the precise stability region of the half quantum vortex (HQV)
for superfluid He A phase confined in parallel plates with a narrow gap
under rotation. Standard Ginzburg-Landau free energy, which is well
established, is solved to locate the stability region spanned by temperature
and rotation speed (). This - stability region is wide
enough to check it experimentally in available experimental setup. The detailed
order parameter structure of HQV characterized by A core is given to
facilitate the physical reasons of its stability over other vortices or
textures.Comment: 5 pages, 4 figure
Majorana surface states of superfluid 3He A- and B-phases in a slab
Motivated by experiments on the superfluid 3He confined in a thin slab, we
design a concrete experimental setup for observing the Majorana surface states.
We solve the quasi-classical Eilenberger equation, which is quantitatively
reliable, to evaluate several quantities, such as local density of states
(LDOS), mass current for the A-phase, and spin current for the B-phase. In
connection with realistic slab samples, we consider the upper and lower
surfaces and the side edges including the corners with several thicknesses.
Consequently the influence on the Majorana zero modes from the spatial
variation of l-vector for the A-phase in thick slabs and the energy splitting
of the zero-energy quasi-particles for the B-phase confined in thin slabs are
demonstrated. The corner of slabs in the B-phase is accompanied by the unique
zero-energy LDOS of corner modes. On the basis of the quantitative calculation,
we propose several feasible and verifiable experiments to check the existence
of the Majorana surface states, such as the measurement of specific heat, edge
current, and anisotropic spin susceptibility.Comment: 13 pages, 10 figures, published versio
Imaging Simulations of the Sunyaev-Zel'dovich Effect for ALMA
We present imaging simulations of the Sunyaev-Zel'dovich effect of galaxy
clusters for the Atacama Large Millimeter/submillimeter Array (ALMA) including
the Atacama Compact Array (ACA). In its most compact configuration at 90GHz,
ALMA will resolve the intracluster medium with an effective angular resolution
of 5 arcsec. It will provide a unique probe of shock fronts and relativistic
electrons produced during cluster mergers at high redshifts, that are hard to
spatially resolve by current and near-future X-ray detectors. Quality of image
reconstruction is poor with the 12m array alone but improved significantly by
adding ACA; expected sensitivity of the 12m array based on the thermal noise is
not valid for the Sunyaev-Zel'dovich effect mapping unless accompanied by an
ACA observation of at least equal duration. The observations above 100 GHz will
become excessively time-consuming owing to the narrower beam size and the
higher system temperature. On the other hand, significant improvement of the
observing efficiency is expected once Band 1 is implemented in the future.Comment: 16 pages, 12 figures. Accepted for publication in PASJ. Note added in
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Transferrin gene expression and synthesis by cultured choroid plexus epithelial cells Regulation by serotonin and cyclic adenosine 3',5'-monophosphate
Primary cultures of rat choroid plexus epithelial cells were established and used to investigate the role of the choroid plexus in the synthesis and secretion of transferrin. Transferrin gene expression was determined by a Northern blot analysis with a transferrin cRNA probe. A single transferrin mRNA species was detected and found to be the same size as the transcripts in the liver and Sertoli cells. Immunoprecipitation of radiolabeled secreted proteins with an antiserum transferrin antibody demonstrated that cultured choroid plexus epithelial cells synthesize and secrete a 70-kDa species of transferrin. Levels of transferrin secretion by rat choroid plexus epithelial cells in culture were measured by radioimmunoassay. Treatment of the choroid plexus epithelial cells in culture with cell-permeable cAMP analogs or serotonin led to time- and concentration-dependent changes in the levels of transferrin in the medium. Dibutyryl-cAMP and 8-bromo-cAMP decreased the levels of transferrin synthesized and secreted by choroid plexus epithelial cells with an EC50 value of 30 nM. Serotonin, however, increased the levels of transferrin with an EC50 value of 100 nM. A concomitant change in transferrin mRNA concentrations was observed in response to serotonin. These data suggest that the synthesis of transferrin by the choroid plexus is reciprocally regulated by the neurotransmitter serotonin and by regulatory agents coupled to adenylate cyclase. Regulatory agents such as serotonin may have a critical role in modulating the proteins synthesized by the choroid plexus, thereby influencing the composition of the cerebrospinal fluid
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