437 research outputs found
Bosonic Helium droplets with cationic impurities: onset of electrostriction and snowball effects from quantum calculations
Variational MonteCarlo and Diffusion MonteCarlo calculations have been
carried out for cations like Li, Na and K as dopants of small
helium clusters over a range of cluster sizes up to about 12 solvent atoms. The
interaction has been modelled through a sum-of-potential picture that
disregards higher order effects beyond atom-atom and atom-ion contributions.
The latter were obtained from highly correlated ab-initio calculations over a
broad range of interatomic distances.
This study focuses on two of the most striking features of the microsolvation
in a quantum solvent of a cationic dopant: electrostriction and snowball
effects. They are here discussed in detail and in relation with the nanoscopic
properties of the interaction forces at play within a fully quantum picture of
the clusters features
Fresco Thermograph IC Inspection by Convective Heating Technique
Various Thermal/Infrared Non Destructive Testing techniques are gaining interest expanding the number of applications. The non-contact nature and the increased reliability of findings make this method particularly interesting for the works of art NDE. This work is devoted to the frescoes inspection for the sizing of detached plaster areas. Air filled voids in between the coloured plaster and the supporting wall are well identified due to the increased thermal resistance. Defects are evaluated from the evolution in time of the surface temperature detected by an IR camera in transient thermal regime. The inspection of large surfaces was recently and successfully applied by means of a lateral heating [1â2]. An advantage of this procedure is the reduced inspection time. This aspect is extremely important when the thermal diffusivity of the material is low, so that a long time is needed for the thermal signal appearance.</p
Automatic Procedure for Thermal NDE of Delaminations in CFRP by Using Neural Networks
This work is a first step in detecting and characterizing defects in an automatic way by using artificial intelligence. Transient thermal NDE by IR thermography is the method used for such a purpose. Data are processed by Neural Networks
E-readers and the death of the book: or, new media and the myth of the disappearing medium
The recent emergence of e-readers and e-books has b
rought the death of the book to the centre of
current debates on new media. In this article, we a
nalyse alternative narratives that surround the
possibility of the disappearance of print books, do
minated by fetishism, fears about the end of
humanism, and ideas of techno-fundamentalist progre
ss. We argue that, in order to comprehend
such narratives, we need to inscribe them in the br
oader history of media. The emergence of new
media, in fact, has often been accompanied by narra
tives about the possible disappearance of
older media: the introduction of television, for in
stance, inspired claims about the forthcoming
death of film and radio. As a recurrent narrative s
haping the reception of media innovation, the
myth of the disappearing medium helps us to make se
nse of the transformations that media
change provokes in our everyday life
Schumpeter: Theorist of the Avant-Garde
This paper argues that Schumpeterâs 1911 edition of âTheory of Economic
Developmentâ can be fruitfully read as a theory of the avant-garde, in line with such
theories developed by artistic avant-garde around the same time, in particular by the
Italian Futurists. In particular it will show that both Schumpeter and other avant-garde
theorists sought to break with past (1), identify an avant-garde who could force that
break (2), find new ways to represent the dynamic world (3), embrace the new and
dynamic (4) and promote a perpetual dynamic process, instead of a specific end-state or
utopia (5). This new reading helps us to understand the cultural meaning of this seminal
text in economics. Secondly it greatly facilitates our understanding of the differences
with the later interwar German edition and English edition, which were more cautious
in their embrace of the new, less focused on the individual qualities of the entrepreneur
and placed more emphasis on historical continuity. Thirdly this reading suggests a
different reason for the bifurcation between Schumpeter and the rest of the Austrian
school of economics. Traditionally this split is explained by Schumpeterâs affinities
with the Lausanne School, this paper instead suggests that the crucial break between
Schumpeter on the one hand and Böhm-Bawerk, Wieser and later members of the
Austrian School on the other hand is their theory of and attitude toward social change
Spin Glass and Antiferromagnetic Behaviour in a Diluted fcc Antiferromagnet
We report on a Monte Carlo study of a diluted Ising antiferromagnet on a fcc
lattice. This is a typical model example of a highly frustrated
antiferromagnet, and we ask, whether sufficient random dilution of spins does
produce a spin glass phase. Our data strongly indicate the existence of a spin
glass transition for spin--concentration : We find a divergent spin
glass susceptibility and a divergent spin glass correlation length, whereas the
antiferromagnetic correlation length saturates in this regime. Furthermore, we
find a first order phase transition to an antiferromagnet for ,
which becomes continuous in the range . Finite size scaling is
employed to obtain critical exponents. We compare our results with experimental
systems as diluted frustrated antiferromagnets as .Comment: 29 pages (revtex) and 10 figures uuencoded and Z-compresse
Comprehensive review of the detection methods for synthetic cannabinoids and cathinones
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