20,229 research outputs found
Magnetization transfer MRI measurements of cervical spinal cord abnormalities in patients with neuromyelitis optica
Poster Presentation - Advanced Imaging of Spine: no. 4230postprintThe Joint Annual Meeting of ISMRM-ESMRMB 2010, Stockholm, Sweden, 1-7 May 2010
Quantitative assessment of the cervical spinal cord damage in neuromyelitis optica using diffusion tensor imaging at 3T
postprintThe Joint Annual Meeting of ISMRM-ESMRMB 2010, Stockholm, Sweden, 1-7 May 2010
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Development of Nanocomposite Powders for the SLS Process to Enhance Mechanical Properties
In an effort to fabricate prototypes with improved mechanical properties in the dual laser
sintering process, functionalized graphite nanoplatelets were added to the PA-12 powder to
produce a nanocomposite powder. The PA-12 powder was chosen as the matrix polymer
because it has features conducive to laser sintering such as relatively low melting temperature
and high mechanical properties. The GNPs were oxidized through a nitric acid treatment to
improve the interfacial bonding. The resulting nanocomposite powder was layered and sintered
by laser without any sign of agglomeration. Although the result is preliminary, it nevertheless
shows the suitability of the nanocomposite powder for the laser sintering process.Mechanical Engineerin
Low Pressure Ethenolysis of Renewable Methyl Oleate in a Microchemical System
A microchemical system for ethenolysis of renewable methyl oleate was developed, in which the dual-phase, microfluidic design enabled efficient diffusion of ethylene gas into liquid methyl oleate through an increased contact area. The increased mass transfer of ethylene favored the formation of desired commodity chemicals with significantly suppressed homometathesis when compared to the bulk system. In addition to higher selectivity and conversion, this system also provides the typical advantages of a microchemical system, including the possibility of convenient scale-up
The effect of 3He impurities on the nonclassical response to oscillation of solid 4He
We have investigated the influence of impurities on the possible supersolid
transition by systematically enriching isotopically-pure 4He (< 1 ppb of 3He)
with 3He. The onset of nonclassical rotational inertia is broadened and shifts
monotonically to higher temperature with increasing 3He concentration,
suggesting that the phenomenon is correlated to the condensation of 3He atoms
onto the dislocation network in solid 4He.Comment: 4 page
Absence of supersolidity in solid helium in porous Vycor glass
In 2004, Kim and Chan (KC) carried out torsional oscillator (TO) measurements
of solid helium confined in porous Vycor glass and found an abrupt drop in the
resonant period below 200 mK. The period drop was interpreted as probable
experimental evidence of nonclassical rotational inertia (NCRI). This
experiment sparked considerable activities in the studies of superfluidity in
solid helium. More recent ultrasound and TO studies, however, found evidence
that shear modulus stiffening is responsible for at least a fraction of the
period drop found in bulk solid helium samples. The experimental configuration
of KC makes it unavoidable to have a small amount of bulk solid inside the
torsion cell containing the Vycor disc. We report here the results of a new
helium in Vycor experiment with a design that is completely free from any bulk
solid shear modulus stiffening effect. We found no measureable period drop that
can be attributed to NCRI
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