898 research outputs found
Fine morphology of the myrmecophilous larva of Paussus kannegieteri (Coleoptera: Carabidae: Paussinae: Paussini). Corresponding author
No full textFIGURES 13–18. Paussus kannegieteri third instar larva: 13, thorax, left lateral view; 14, thorax, dorsal view; 15, mesothoracic spiracle; 16, metathoracic spiracle-like structure; 17, mesothoracic leg, anterolateral view; 18, apex of metathoracic leg with lanceolate setae, posterolateral view. CO = coxa, ls = lanceolate setae, m = membrane, ME = mesonotum, MT = metanotum, pe = peritreme, PR = pronotum, un = claw. Scale bars: Figs. 13–14 = 500 µm; Fig. 15 = 10 µm; Fig. 16 = 20 µm; Fig. 17 = 200 µm; Fig. 18 = 50 µm.Published as part of Giulio, Andrea Di, 2008, Fine morphology of the myrmecophilous larva of Paussus kannegieteri (Coleoptera: Carabidae: Paussinae: Paussini), pp. 37-50 in Zootaxa 1741 on page 44, DOI: 10.5281/zenodo.18152
Measurement of TMD observables at COMPASS
No full textCOMPASS is a fixed target experiment at the CERN SPS taking data since 2002. An important part of the physics programme is the study of the spin structure of the nucleon by measuring deep inelastic scattering of high energy muons off polarized or unpolarized nucleons. In particular COMPASS has given and is giving an important contribution to understand the role of parton transverse spin and transverse momentum, a recent topic on which a large international community is working. The most recent COMPASS measurements in this field and their relevance are here reviewed
GIULIO TARRA TRADUTTORE DAL FRANCESE
No full textCon Il Libro pel bambino, Don Giulio Tarra risultò il vincitore di due concorsi indetti dal Congresso Pedagogico Italiano nel 1861: quello per un libro di lettura destinato ai bambini sordomuti e l’altro per un libro destinato alle scuole rurali. Fra le opere del Tarra pubblicate da Paolo Carrara è menzionato il volumetto “Lezioni in famiglia, versione da M. Carraud”. Questo contributo intende offrire alcuni elementi d’informazione su Zulma Carraud, autrice delle Historiettes véritables pour les enfants de quatre à huit ans, titolo originale della raccolta di racconti tradotta da Don Giulio. Il libro era uscito a Parigi nel 1864 per i tipi di Hachette. In precedenza lo stesso editore aveva accolto le prime opere di Zulma nelle collane destinate alla scuola primaria. A pochi anni di distanza l’uno dall’altra, la Carraud nella Francia del II Impero e il Tarra nell’Italia postunitaria, entrambi hanno contribuito con i loro “libri di lettura” allo sviluppo dell’editoria per la scuola e per l’infanzia.
Giulio Tarra translator from French
With the volume entitled Il Libro pel bambino, Don Giulio Tarra won two literary competitions held in 1861 by the Congresso Pedagogico Italiano: the first was dedicated to books for deaf-mute chidren, the second to books for rural schools. Among Tarra’s works published by Paolo Carrara we find “Lezioni in famiglia, versione da M. Carraud”. This article provides some information about Zulma Carraud, the author of the collection of novels entitled: Historiettes véritables pour les enfants de quatre à huit ans published by Hachette in 1864 and translated into Italian by Don Giulio. Previously the same publisher had collected Zulma’s first works in a series to be used in primary schools. Carraud, during the Second Empire period in France, and Tarra, in post-Unity Italy, both contributed to the development of the publishing industry for schools and children with their educational and entertaining books
Measurements of the transverse momentum dependent azimuthal asymmetries in SIDIS at COMPASS
No full text2009/2010The main topic of this thesis is the measurement of the transverse
momentum dependent (TMD) azimuthal asymmetries in the
inclusive hadron production in the deep inelastic scattering (DIS).
This work has been carried on in the framework of COMPASS, a
fixed target experiment at CERN's SPS, which started data taking in 2002.
One of the main topic of COMPASS is the study of the nucleon spin
structure using high energy (100-200 GeV) muon beam and either
transversely and longitudinally polarized proton and deuteron target.
Recent developments both from the experimental and theoretical side
pointed out the relevance of the transverse spin effects and
of new effects, related to the intrinsic transverse momentum of the
quark and its correlation with the spin.
The nucleon structure, in the non perturbative QCD formalism, can be
described at first order, in the collinear approximation,
by three parton distribution functions (PDF):
the unpolarized PDF, the helicity PDF and the transversity PDF.
When including the intrinsic transverse momentum of the quark
other 5 PDFs are needed at first order.
They are related to the correlation between the transverse momentum
of the quark and the spin and are practically unmeasured.
The semi inclusive DIS (SIDIS) allows to study all these functions.
Indeed the the SIDIS differential cross section, taking into account
the beam and target polarization, is characterized by 14
azimuthal modulations in independent linear combination
of the nucleon spin angle and of the hadrons angle,
as measured with respect to the virtual photon direction.
Their amplitudes are related to the structure functions
given by the convolution between the new PDFs and the
hadron fragmentation functions.
In this thesis the measurement of the azimuthal asymmetries
which appears in the SIDIS cross section on the unpolarized and
longitudinally polarized target. Of particular interest is the
information that this measurement give on the Boer-Mulders TMD PDF,
which is a very interesting topic.
The analysed data have been taken using the 160 GeV positive muon beam
on the deuteron target. The target configuration and the spectrometer
are optimized for the spin asymmetry measurements and are described
in the thesis as well as the data taking. Also, the data processing and
the software used for the analysis and the SIDIS
data selection are described.
The measurement of the azimuthal asymmetries on the longitudinally
polarized target have been done using the same data as the one
used for the G (the contribution to the nucleon spin of
the longitudinal spin of the gluons) measurement. To avoid acceptance
effects in the asymmetries extraction, the data collected from the
two oppositely polarized target cells (which form the target) have been
opportunely combined. Other possible systematic effects have been
studied in details and are described in the thesis. \\
The asymmetries have been extracted as functions of the
relevant kinematical variables and separately for positive and negative
hadrons. The final results, accepted for publication in European
Journal C, are compared with the results
produced by other experiments and with the calculations
of theoretical models of the TMD functions.
The measurement of the azimuthal asymmetries which appears in the
spin independent part of the SIDIS cross section is more difficult
since it cannot benefit from the periodically reversal of the target
polarization. The measured hadron azimuthal distributions must be
corrected for the possible effects introduced by the apparatus acceptance
(geometrical acceptance, detectors and trigger efficiencies). The Monte
Carlo simulation of the apparatus has been used to estimate those effects.
Extensive studies of the description of the azimuthal acceptance of
the apparatus have been done in the whole kinematical domain of
interest using different SIDIS events generations.
A reliable asymmetries extraction method has been developed and used.
A considerable effort has been put into the study and the control
of the systematics. Also in this case the asymmetries have
been extracted as functions of the relevant kinematical
variables and separately for positive and negative hadrons. \\
The strongest measured signals are related to the Cahn effect,
which is a kinematical effect proportional to the intrinsic
transverse momentum of the quarks, and to the Boer-Mulders TMD PDF,
describing the correlation between the intrinsic transverse
momentum of the quark and its transverse spin. \\
The results, in particular the kinematical and the charge
dependencies of the asymmetries, are interpreted in terms
of TMD quantities and higher effects in the non perturbative QCD.
The comparisons with the results
produced by the other experiments, and with the theoretical predictions
are also discussed.XXIII Ciclo197
Azimuthal asymmetries in the unpolarized SIDIS cross section at COMPASS
No full textThe study of the spin structure of the nucleon and of the effects rising from the quarks transverse momentum are part of the scientific program of COMPASS, a fixed target experiment at the CERN SPS. The azimuthal asymmetries which appear in the cross-section of SIDIS off unpolarized targets can give insights on the intrinsic momentum structure of the nucleon and on the possible correlation between transverse spin and transverse momentum of the quarks. Here we present the new results for these asymmetries obtained from the COMPASS data collected with a 160 GeV/c positive muon beam impinging on a target. The asymmetries are measured for both positive and negative hadrons, and their dependence on several kinematical variable has been studiedThe study of the spin structure of the nucleon and of the effects rising from the quarks transverse momentum are part of the scientific program of COMPASS, a fixed target experiment at the CERN SPS. The azimuthal asymmetries which appear in the cross-section of SIDIS off unpolarized targets can give insights on the intrinsic momentum structure of the nucleon and on the possible correlation between transverse spin and transverse momentum of the quarks. Here we present the new results for these asymmetries obtained from the COMPASS data collected with a 160 GeV/c positive muon beam impinging on a target. The asymmetries are measured for both positive and negative hadrons, and their dependence on several kinematical variable has been studie
Measurements of unpolarised azimuthal asymmetries at COMPASS
No full textAzimuthal asymmetries in unpolarized SIDIS can be used to probe the transverse momentum of the quarks inside the nucleon. Furthermore they give access to the so-far unmeasured Boer-Mulders function. We report on the extraction of these asymmetries from the COMPASS data taken with a 160 GeV/c beam impinging on a deuteron target. This asymmetries have been extracted separately for positive and negative hadrons, and the results have been compared with theoretical predictions.Azimuthal asymmetries in unpolarized SIDIS can be used to probe the transverse momentum of the quarks inside the nucleon. Furthermore they give access to the so-far unmeasured Boer-Mulders function. We report on the extraction of these asymmetries from the COMPASS data taken with a 160 GeV/c beam impinging on a deuteron target. This asymmetries have been extracted separately for positive and negative hadrons, and the results have been compared with theoretical predictions
Di-hadron asymmetry and interplay between transversity induced asymmetries in hadron leptoproduction at COMPASS
No full textNew results on the transverse spin azimuthal asymmetries in semi-inclusive DIS reactions extracted by the COMPASS Collaboration from the data collected with a transversely polarised proton target are presented. A noticeable similarity between the Collins asymmetry and the dihadron asymmetry, already been observed and reported, triggered a more deep investigation on the angular correlations and the relevant kinematical variables. The resulting phenomenological analysis of the transversity induced asymmetries, presented in this talk, allows to establish quantitative relationships, providing strong indication that the underlying fragmentation mechanisms are all driven by a common physical process
Barocco italiano; Giovan Battista Basile
No full textSi tratta di due capitoli del volume Letteratura curato da Giulio Ferroni, in cui si definiscono le coordinate del Barocco in una chiave originale e si rivede l'opera del Basile, considerando non soltanto il Cunto de li Cunti, ma anche le opere volgari.These are two chapters of the volume titled Letteratura, ed. by Giulio Ferroni; the first is dedicated to a reassessment of the concept of Baroque in a new perspective; the second is a little monograph about the author of Lo Cunto de li Cunti, considering also his literary production in italian language
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