449 research outputs found
Medicalization of Crime: The Florianopolis Penitentiary as a Space for Knowledge and Power (1933-1945)
Objectives: There are two central objectives of this article. One is to analyze how fears that affected urban centers after the 19th century have repercussions on Florianopolis; and the other is to understand the strategies created by their control, specifically in penitentiary centers
Brillouin-Raman mapping of natural fibers with spectral moment analysis
This is the author accepted manuscript. The final version is available from the Optical Society of America via the DOI in this record.Brillouin spectroscopy has emerged as a novel analytical tool for biophotonic research and applications. It operates on a microscopic scale and in the GHz spectral range, providing a new spatial and frequency window for the analysis of the structure and elasticity of materials. Here we investigate spectral moments calculation as a means of analysing Brillouin and Raman spectra, providing rapid access to peak intensity and frequency shift, with robust application to fast scanning measurements. This work demonstrates the potential of the method, especially in the case of micro-structured samples, typical of bio-medical applications.COST (European Cooperation in Science and Technology
Ergodicity breaking in strong and network-forming glassy system
The temperature dependence of the non-ergodicity factor of vitreous GeO,
, as deduced from elastic and quasi-elastic neutron scattering
experiments, is analyzed. The data are collected in a wide range of
temperatures from the glassy phase, up to the glass transition temperature, and
well above into the undercooled liquid state. Notwithstanding the investigated
system is classified as prototype of strong glass, it is found that the
temperature- and the -behavior of follow some of the predictions
of Mode Coupling Theory. The experimental data support the hypothesis of the
existence of an ergodic to non-ergodic transition occurring also in network
forming glassy systems
Evidence of anomalous dispersion of the generalized sound velocity in glasses
The dynamic structure factor, S(Q,w), of vitreous silica, has been measured
by inelastic X-ray scattering in the exchanged wavevector (Q) region Q=4-16.5
nm-1 and up to energies hw=115 meV in the Stokes side. The unprecedented
statistical accuracy in such an extended energy range allows to accurately
determine the longitudinal current spectra, and the energies of the vibrational
excitations. The simultaneous observation of two excitations in the acoustic
region, and the persistence of propagating sound waves up to Q values
comparable with the (pseudo-)Brillouin zone edge, allow to observe a positive
dispersion in the generalized sound velocity that, around Q=5 nm-1, varies from
6500 to 9000 m/s: this phenomenon was never experimentally observed in a glass.Comment: 5 pages, 3 figures. To appear in Phys. Rev.
Spectral- and size-resolved mass absorption efficiency of mineral dust aerosols in the shortwave spectrum: a simulation chamber study
This paper presents new laboratory measurements
of the mass absorption efficiency (MAE) between 375 and
850 nm for 12 individual samples of mineral dust from different
source areas worldwide and in two size classes: PM10:6
(mass fraction of particles of aerodynamic diameter lower
than 10.6 \u3bcm) and PM2:5 (mass fraction of particles of aerodynamic
diameter lower than 2.5 \u3bcm). The experiments were
performed in the CESAM simulation chamber using mineral
dust generated from natural parent soils and included optical
and gravimetric analyses.
The results show that the MAE values are lower for
the PM10:6 mass fraction (range 37\u2013135x10-3 m2 g-1 at
375 nm) than for the PM2:5 (range 95\u2013711x10-3 m2 g-1 at
375 nm) and decrease with increasing wavelength as lambda-AAE,
where the \uc5ngstr\uf6m absorption exponent (AAE) averages
between 3.3 and 3.5, regardless of size. The size independence
of AAE suggests that, for a given size distribution, the oxide fraction, which could ease the application and the validation
of climate models that now start to include the representation
of the dust composition, as well as for remote
sensing of dust absorption in the UV\u2013vis spectral region
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