179,055 research outputs found
Set-up and characterization of a humidity sensor realized in LTCC-technology
A new type of integrated temperature and humidity sensor applying
LTCC-technology has been developed and characterized. In this approach, sensing
elements are implemented using heated metal resistors (Pt-elements), where one
is exposed to the humid environment that causes the sensor element to cool down
with increased humidity, while the other one is sealed from the environment.
Sensor design is based on FEA (Finite Element Analyses) where the critical
design parameters have been analyzed with regard to the performance
characteristic of the device. The set-up of sensor element will be shown and
the functional capability will be demonstrated by experimental results.Comment: Submitted on behalf of EDA Publishing Association
(http://irevues.inist.fr/EDA-Publishing
A new Sobolev gradient method for direct minimization of the Gross-Pitaevskii energy with rotation
In this paper we improve traditional steepest descent methods for the direct
minimization of the Gross-Pitaevskii (GP) energy with rotation at two levels.
We first define a new inner product to equip the Sobolev space and derive
the corresponding gradient. Secondly, for the treatment of the mass
conservation constraint, we use a projection method that avoids more
complicated approaches based on modified energy functionals or traditional
normalization methods. The descent method with these two new ingredients is
studied theoretically in a Hilbert space setting and we give a proof of the
global existence and convergence in the asymptotic limit to a minimizer of the
GP energy. The new method is implemented in both finite difference and finite
element two-dimensional settings and used to compute various complex
configurations with vortices of rotating Bose-Einstein condensates. The new
Sobolev gradient method shows better numerical performances compared to
classical or gradient methods, especially when high rotation rates
are considered.Comment: to appear in SIAM J Sci Computin
Recent developments in the Suzuki-Miyaura reaction: 2010-2014
The Suzuki-Miyaura reaction (SMR), involving the coupling of an organoboron reagent and an organic halide or pseudo-halide in the presence of a palladium or nickel catalyst and a base, has arguably become one of most utilized tools for the construction of a C-C bond. This review intends to be general account of all types of catalytic systems, new coupling partners and applications, including the literature between September 2010 and December 2014
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