1,502 research outputs found
Search for Neutrinoless Double Beta Decay with NEMO 3 and SuperNEMO
Since 2003 the NEMO~3 experiment has been searching for neutrinoless double
beta decay using about 10 kg of enriched isotopes. A limit of T_(1/2)(0nu) >
5.8 10**23 years at 90 % CL has been obtained for 100-Mo from the first two
years of data. Several measurements of two-neutrino double beta decays have
also been performed. A first NEMO 3 measurement of the half-life of 130-Te is
presented, giving a value of T_(1/2)(2nu) = (7.6 +- 1.5 (stat) +- 0.8 (syst))
10**20 years. In parallel, there is an active R&D programme for the SuperNEMO
experiment which is expected to commence data taking in 2012-2013 with 100-200
kg of enriched isotopes.Comment: 6 pages, 3 figures, Proceedings of the 2007 Europhysics Conference on
High Energy Physics, in Manchester, England, 19-25 July 200
The shape parameter of liposomes and DNA-lipid complexes determined by viscometry utilizing small sample volumes
A minicapillary viscometer utilizing \u3c0.5 ml of sample at a volume fraction of \u3c0.1% is described. The calculated a/b of DPPC/DPPG multilamellar liposome was 1.14 as prolate ellipsoids and a/b of dioleoylpropyltrimethyl ammonium methylsulfate-DNA complex at a charge ratio of 4:1 (+/-) was 3.7 as prolate ellipsoids or 4.9 as oblate ellipsoids. The deviation of shape from perfect sphere is thus expressed quantitatively in more than two significant figures. In these measurement, the necessary amount of DNA is \u3c0.5 mg
Near-linear dynamics in KdV with periodic boundary conditions
Near linear evolution in Korteweg de Vries (KdV) equation with periodic
boundary conditions is established under the assumption of high frequency
initial data. This result is obtained by the method of normal form reduction
Proceedings of the 35th Sapporo Symposium on Partial Differential Equations
conf: The 35th Sapporo Symposium on Partial Differential Equations (Room 203, Faculty of Science Building #5, Hokkaido University , August 23-25, 2010
Enhancement of piezoelectricity in a mixed ferroelectric
We use first-principles density-functional total energy and polarization
calculations to calculate the piezoelectric tensor at zero temperature for both
cubic and simple tetragonal ordered supercells of Pb_3GeTe_4. The largest
piezoelectric coefficient for the tetragonal configuration is enhanced by a
factor of about three with respect to that of the cubic configuration. This can
be attributed to both the larger strain-induced motion of cations relative to
anions and higher Born effective charges in the tetragonal case. A normal mode
decomposition shows that both cation ordering and local relaxation weaken the
ferroelectric instability, enhancing piezoelectricity.Comment: 5 pages, revtex, 2 eps figure
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