160 research outputs found
Anisakid and Raphidascaridid parasites in Trachurus trachurus: infection drivers and possible effects on the hostâs condition
This study investigated the distribution of nematode larvae of Anisakidae and Raphidascarididae (genera Anisakis and Hysterothylacium) in Trachurus trachurus (Linnaeus, 1758) in the Ligurian and central-northern Tyrrhenian Seas. The relationship between the number of parasites and the length and weight parameters of the fish was assessed, and the possible effect of the parasites on the condition factor was evaluated. A total of 190 T. trachurus specimens were collected in July 2019. Parasites were found in 70 individuals. A total of 161 visible larvae were collected in the viscera. Morphological analysis revealed the presence of Anisakis spp. in 55 fish and Hysterothylacium spp. in 15 fish, while 5 fish showed coinfection with both genera. The specimens subjected to PCR (n = 67) showed that 85% of the Anisakis larvae analyzed belonged to the species A. pegreffii, while the remaining 15% belonged to hybrids of A. pegreffii-A. simplex (s.s.). A total of 58% (n = 7) of the Hysterothylacium larvae analyzed belonged to the species H. fabri, while 42% belonged to the species H. aduncum. Our results support the hypothesis that infection with these parasites does not affect the condition of the fish host analyzed, and that body size and depth are major drivers in determining infection levels with Anisakid and Raphidascaridid nematodes
The FAOSTAT database of greenhouse gas emissions from agriculture
Peer reviewedPublisher PD
Role of charge doping and lattice distortions in codoped Mg_{1-x}(AlLi)_{x}B_2 compounds
We prepared a series of Mg_{1-x}(AlLi)_{x}B_2 samples with
0≤x≤0.45 in order to compensate with Li the electron doping induced
by Al. Structural characterization by means of neutron and X-ray diffraction
confirms that Li enters the MgB2 structure even though in an amount less than
nominal one. We performed susceptibility, resistivity and specific heat
measurements. Vibrational properties were also investigated by means of Raman
spectroscopy. We compare these results with those obtained on a homologous
series of Mg_{1-x}Al_{x}B_2 samples. The systematic success of scaling the
relevant properties with the Al content rather than with the electron doping
suggests that lattice deformation plays an important role in tuning the
superconducting properties.Comment: 15 pages, 13 figures; changes: "codoped" instead of "co-doped"; added
comments in the Fig. 11 caption Comments 31/1/2006: 16 figures ; new revised
version of the manuscrip
Typhoon at CommsNet13: Experimental experience on AUV navigation and localization
This paper presents two acoustic-based techniques for Autonomous Underwater Vehicle (AUV) navigation within an underwater network of fixed sensors. The proposed algorithms exploit the positioning measurements provided by an Ultra-Short Base Line (USBL) transducer on-board the vehicle to aid the navigation task. In the considered framework the acoustic measurements are embedded in the communication network scheme, causing time-varying delays in ranging with the fixed nodes. The results presented are obtained with post-processing elaborations of the raw experimental data collected during the CommsNet13 campaign, organized and scientifically led by the NATO Science and Technology Organization Centre for Maritime Research and Experimentation (CMRE). The experiment involved several research institutions and included among its objectives the evaluation of on-board acoustic USBL systems for navigation and localization of AUVs. The ISME groups of the Universities of Florence and Pisa jointly participated to the experiment with one Typhoon class vehicle. This is a 300 m depth rated AUV with acoustic communication capabilities originally developed by the two groups for archaeological search in the framework of the THESAURUS project. The CommsNet13 Typhoon, equipped with an acoustic modem/USBL head, navigated within the fixed nodes acoustic network deployed by CMRE. This allows the comparison between inertial navigation, acoustic self-localization and ground truth represented by GPS signals (when the vehicle was at the surface)
SrVOFeAs: A Nanolayered Bimetallic Iron Pnictide Superconductor
One of the unifying concepts in the iron-pnictide superconductors, both for
the mechanism of magnetic ordering and of unconventional order parameter
character, has been the electron and hole Fermi surfaces that are approximately
nested. Using the density functional methods that have predicted Fermi surfaces
correctly in SrFeP, we find that the recently reported superconducting
SrVOFeAs, with =37 K and no apparent competition between magnetism
and superconductivity, possesses different Fermi surface geometry and character
than previous classes of iron pnictides. The intervening layer (a V bilayer)
gives rise to bands that cross the Fermi level. Coupling to the FeAs layer is
small except for interaction along the zone boundary, however that coupling
degrades the Fermi surface nesting. SrVOFeAs, with its alternating
layers of open shell atoms, deserves further close study that should help to
understand the origin of the properties of iron pnictide compounds.Comment: 6 pages and 4 embedded figure
Isoelectronic Ru substitution at Fe-site in Sm(Fe1-xRux)As(O0.85F0.15) compound and its effects on structural, superconducting and normal state properties
In this work we present a systematic experimental and theoretical study of
the structural, transport and superconducting properties of
Sm(Fe1-xRux)As(O0.85F0.15) polycrystalline samples as a function of Ru content
(x) ranging from 0 to 1. The choice of Ru as isoelectronic substitution at Fe
site of F-doped compounds allows to better clarify the role of structural
disorder in modifying the normal and superconducting properties of these newly
discovered multiband superconductors. Two different regions are identified: the
Fe-rich phase (x<0.5) where superconducting and normal state properties are
strongly affected by disorder induced by Ru substitution; the Ru-rich phase
(x>0.5) where the system is metallic and strongly compensated and the presence
of Ru frustrates the magnetic moment on Fe ions. Here the lack of magnetic
features and related spin fluctuations may be the cause for the suppression of
superconductivity.Comment: Accepted on Physical Review
Physics at a 100 TeV pp collider: Higgs and EW symmetry breaking studies
This report summarises the physics opportunities for the study of Higgs
bosons and the dynamics of electroweak symmetry breaking at the 100 TeV pp
collider.Comment: 187 pages, 94 figures. Chapter 2 of the "Physics at the FCC-hh"
Repor
Les Houches 2013: Physics at TeV Colliders: Standard Model Working Group Report
This Report summarizes the proceedings of the 2013 Les Houches workshop on
Physics at TeV Colliders. Session 1 dealt primarily with (1) the techniques for
calculating standard model multi-leg NLO and NNLO QCD and NLO EW cross sections
and (2) the comparison of those cross sections with LHC data from Run 1, and
projections for future measurements in Run 2.Comment: Proceedings of the Standard Model Working Group of the 2013 Les
Houches Workshop, Physics at TeV Colliders, Les houches 3-21 June 2013. 200
page
Effective Holographic Theories for low-temperature condensed matter systems
The IR dynamics of effective holographic theories capturing the interplay
between charge density and the leading relevant scalar operator at strong
coupling are analyzed. Such theories are parameterized by two real exponents
that control the IR dynamics. By studying the thermodynamics,
spectra and conductivities of several classes of charged dilatonic black hole
solutions that include the charge density back reaction fully, the landscape of
such theories in view of condensed matter applications is characterized.
Several regions of the plane can be excluded as the extremal
solutions have unacceptable singularities. The classical solutions have
generically zero entropy at zero temperature, except when where
the entropy at extremality is finite. The general scaling of DC resistivity
with temperature at low temperature, and AC conductivity at low frequency and
temperature across the whole plane, is found. There is a
codimension-one region where the DC resistivity is linear in the temperature.
For massive carriers, it is shown that when the scalar operator is not the
dilaton, the DC resistivity scales as the heat capacity (and entropy) for
planar (3d) systems. Regions are identified where the theory at finite density
is a Mott-like insulator at T=0. We also find that at low enough temperatures
the entropy due to the charge carriers is generically larger than at zero
charge density.Comment: (v3): Added discussion on the UV completion of the solutions, and on
extremal spectra in the charged case. Expanded discusion on insulating
extremal solutions. Many other refinements and corrections. 126 pages. 48
figure
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