924 research outputs found
Rigurgito mitralico e tricuspidale diastolico in due cani con blocco atrioventricolare completo spontaneo
RIASSUNTO Il rigurgito diastolico attraverso entrambe le valvole atrioventricolari Ăš un rilievo ecocardiografico di frequente riscontro in corso di blocco atrioventricolare completo sia nel cane che nellâuomo. LâentitĂ del rigurgito sia mitralico che tricuspidale Ăš lieve e tale da non risultare significativo dal punto di vista emodinamico. La diagnosi puĂČ essere emessa sia con lâausilio del doppler a codice di colore che con il doppler spettrale. Il jet origina dal punto di coaptazione dei lembi valvolari ed Ăš diretto centralmente. Ciononostante, date le piccole dimensioni del jet di rigurgito, lâimpiego combinato delle due metodiche puĂČ essere di aiuto nel posizionamento del volume campione e nellâallineamento del doppler. Lâassenza di contrazione ventricolare a seguito della contrazione atriale comporta un reflusso di sangue allâinterno delle cavitĂ atriali presumibilmente come conseguenza di unâinversione del gradiente pressorio intercorrente tra gli atri e i ventricoli nonchĂ© della chiusura incompleta delle valvole atrioventricolari. La presenza di insufficienza valvolare e quindi di rigurgito sistolico non Ăš un prerequisito necessario allo sviluppo di reflusso diastolico in corso di blocco atrioventricolare completo. SUMMARY Atrioventricular valvular regurgitation is a common echocardiographic finding in both dogs and humans with complete atrioventricular block. The severity of both mitral and tricuspid regurgitation is mild and hemodynamically non significant. The condition can be easily diagnosed by means of either color-flow doppler and spectral doppler. The jet originates from the site of coaptation of valvular leaflets and is centrally directed. Nevertheless, because of the limited size of the regurgitant jet, the combined use of color-flow and spectral doppler can help in placing the sample gate and align for the doppler study. Lack of ventricular contraction following atrial contraction leads to reflux of blood into the atrial cavities, presumably due to atrioventricular pressure gradient reversal and incomplete closure of the mitral valve. The presence of valvular insufficiency and consequent systolic regurgitation is not a prerequisite for diastolic reflux to occur in case of complete atrioventricular block
Treatment of canine leishmaniasis: Long term molecular and serological observations
The aim of the present paper was to evaluate the anti-Leishmania activity of 3 different protocols of treatment (miltefosine plus allopurinol, difloxacin cloridrate plus metronidazole and meglumine antimoniate plus allopurinol) in 42 dogs naturally infected by L. infantum, during a 24-months parasitological and clinical follow-up. Our results suggest that, apart from miltefosine, the other two therapeutic regimens could be evaluated to treat animals with canL in medium-endemicity areas
Intrinsic time resolution of 3D-trench silicon pixels for charged particle detection
In the last years, high-resolution time tagging has emerged as the tool to
tackle the problem of high-track density in the detectors of the next
generation of experiments at particle colliders. Time resolutions below 50ps
and event average repetition rates of tens of MHz on sensor pixels having a
pitch of 50m are typical minimum requirements. This poses an important
scientific and technological challenge on the development of particle sensors
and processing electronics. The TIMESPOT initiative (which stands for TIME and
SPace real-time Operating Tracker) aims at the development of a full prototype
detection system suitable for the particle trackers of the next-to-come
particle physics experiments. This paper describes the results obtained on the
first batch of TIMESPOT silicon sensors, based on a novel 3D MEMS (micro
electro-mechanical systems) design. Following this approach, the performance of
other ongoing silicon sensor developments has been matched and overcome, while
using a technology which is known to be robust against radiation degradation. A
time resolution of the order of 20ps has been measured at room temperature
suggesting also possible improvements after further optimisations of the
front-end electronics processing stage.Comment: This version was accepted to be published on JINST on 21/07/202
Fabrication and Characterisation of 3D Diamond Pixel Detectors With Timing Capabilities
Diamond sensors provide a promising radiation hard solution to the challenges posed by the future experiments at hadron machines. A 3D geometry with thin columnar resistive electrodes orthogonal to the diamond surface, obtained by laser nanofabrication, is expected to provide significantly better time resolution with respect to the extensively studied planar diamond sensors. We report on the development, production, and characterisation of innovative 3D diamond sensors achieving 30% improvement in both space and time resolution with respect to sensors from the previous generation. This is the first complete characterisation of the time resolution of 3D diamond sensors and combines results from tests with laser, beta rays and high energy particle beams. Plans and strategies for further improvement in the fabrication technology and readout systems are also discussed
Search for the rare decays and
A search for the rare decay of a or meson into the final
state is performed, using data collected by the LHCb experiment
in collisions at and TeV, corresponding to an integrated
luminosity of 3 fb. The observed number of signal candidates is
consistent with a background-only hypothesis. Branching fraction values larger
than for the decay mode are
excluded at 90% confidence level. For the decay
mode, branching fraction values larger than are excluded at
90% confidence level, this is the first branching fraction limit for this
decay.Comment: All figures and tables, along with any supplementary material and
additional information, are available at
https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2015-044.htm
Search for heavy neutral lepton production in K+ decays
A search for heavy neutral lepton production in K + decays using a data sample collected with a minimum
bias trigger by the NA62 experiment at CERN in 2015 is reported. Upper limits at the 10â7 to 10â6 level
are established on the elements of the extended neutrino mixing matrix |Ue4|
2 and |UΌ4|
2 for heavy
neutral lepton mass in the ranges 170â448 MeV/c2 and 250â373 MeV/c2, respectively. This improves on
the previous limits from HNL production searches over the whole mass range considered for |Ue4|2 and
above 300 MeV/c2 for |UΌ4|2
A Probe into the Reform of Public Calligraphy Course in Chinese Colleges and Universities
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A new measurement of the K±âϱγγ decay at the NA48/2 experiment
The NA48/2 experiment at CERN collected two data samples with minimum bias trigger conditions in 2003 and 2004. A measurement of the rate and dynamic properties of the rare decay K±âϱγγK±âϱγγ from these data sets based on 149 decay candidates with an estimated background of 15.5±0.715.5±0.7 events is reported. The model-independent branching ratio in the kinematic range z=(mγγ/mK)2>0.2z=(mγγ/mK)2>0.2 is measured to be BMI(z>0.2)=(0.877±0.089)Ă10â6BMI(z>0.2)=(0.877±0.089)Ă10â6, and the branching ratio in the full kinematic range assuming a particular Chiral Perturbation Theory description to be B(KÏγγ)=(0.910±0.075)Ă10â6B(KÏγγ)=(0.910±0.075)Ă10â6
Les droits disciplinaires des fonctions publiques : « unification », « harmonisation » ou « distanciation ». A propos de la loi du 26 avril 2016 relative à la déontologie et aux droits et obligations des fonctionnaires
The production of tt⟠, W+bb⟠and W+cc⟠is studied in the forward region of protonâproton collisions collected at a centre-of-mass energy of 8 TeV by the LHCb experiment, corresponding to an integrated luminosity of 1.98±0.02 fbâ1 . The W bosons are reconstructed in the decays WââÎœ , where â denotes muon or electron, while the b and c quarks are reconstructed as jets. All measured cross-sections are in agreement with next-to-leading-order Standard Model predictions.The production of , and is studied in the forward region of proton-proton collisions collected at a centre-of-mass energy of 8 TeV by the LHCb experiment, corresponding to an integrated luminosity of 1.98 0.02 \mbox{fb}^{-1}. The bosons are reconstructed in the decays , where denotes muon or electron, while the and quarks are reconstructed as jets. All measured cross-sections are in agreement with next-to-leading-order Standard Model predictions
Multidifferential study of identified charged hadron distributions in -tagged jets in proton-proton collisions at 13 TeV
Jet fragmentation functions are measured for the first time in proton-proton
collisions for charged pions, kaons, and protons within jets recoiling against
a boson. The charged-hadron distributions are studied longitudinally and
transversely to the jet direction for jets with transverse momentum 20 GeV and in the pseudorapidity range . The
data sample was collected with the LHCb experiment at a center-of-mass energy
of 13 TeV, corresponding to an integrated luminosity of 1.64 fb. Triple
differential distributions as a function of the hadron longitudinal momentum
fraction, hadron transverse momentum, and jet transverse momentum are also
measured for the first time. This helps constrain transverse-momentum-dependent
fragmentation functions. Differences in the shapes and magnitudes of the
measured distributions for the different hadron species provide insights into
the hadronization process for jets predominantly initiated by light quarks.Comment: All figures and tables, along with machine-readable versions and any
supplementary material and additional information, are available at
https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-013.html (LHCb
public pages
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