1,717 research outputs found
The SHiP experiment at CERN SPS
SHiP is a new general purpose fixed target facility, whose Technical Proposal has been recently submitted to the CERN SPS Committee. In its initial phase, the 400 GeV proton beam extracted from the SPS will be dumped on a heavy target with the aim of integrating 2 × 1020 pot in 5 years. A dedicated detector located downstream of the target, based on a long vacuum tank followed by a spectrometer and particle identification detectors, will allow probing a variety of models with light long-lived exotic particles and masses below a few GeV/c2. The beam dump is also an ideal source of tau neutrinos, the less known particle in the Standard Model. Another dedicated detector, based on the Emulsion Cloud Chamber technology already used in the OPERA experiment, will allow to perform for the first time measurements of the tau neutrino deep inelastic scattering cross section. Tau neutrinos will be distinguished from tau anti-neutrinos, thus providing the first observation of the tau anti-neutrino
Latest results of the OPERA experiment
The OPERA neutrino experiment was designed to perform a unique appearance measurement in the CNGS beam to confirm the oscillation mechanism in the atmospheric sector. Runs were successfully carried out from 2008 to 2012. The status of the analysis is reported and the topology and the kinematics of the first two ντ CC candidate events are described. A first result of the νμ → νe oscillation search is also presented
A stochastic model for the stepwise motion in actomyosin dynamics
A jump-diffusion process is proposed to describe the displacements performed
by single myosin heads along actin filaments during the rising phases. The
process consists of the superposition of a Wiener and a jump process, with
jumps originated by sequences of Poisson-distributed energy-supplying pulses.
In a previous paper, the amplitude of the jumps was described by a mixture of
two Gaussian distributions. To embody the effects of ATP hydrolysis, we now
refine such a model by assuming that the jumps' amplitude is described by a
mixture of three Gaussian distributions. This model has been inspired by the
experimental data of T. Yanagida and his co-workers concerning observations at
single molecule processes level.Comment: 9 pages, 4 figure
Post-pneumonectomy broncho-pleural fistula successfully closed by open-window thoracostomy associated with V.A.C. therapy
Broncho-pleural fistula (BPF), is a dramatic complication that may occur after lung resection. The treatment is challenging due to its high rate of morbidity and mortality. Herein, a case of BPF associated with empyema, occurred in an elderly patient who had undergone to left pneumonectomy for non-small cell lung cancer (NSCLC), is reported. After various treatments including chest drainage and endoscopic procedures, BPF was successfully closed by open-window thoracotomy associated with vacuum assisted closure (V.A.C.) device therapy. The authors conclude that V.A.C. is a convenient and safe measure in the management of empyema with BPF. Moreover, in similar clinical contexts, V.A.C. may be the only option available that may assure the survival of the patient and the avoiding any later-phases of residual cavity
On dynamic mutual information for bivariate lifetimes
We consider dynamic versions of the mutual information of lifetime distributions, with
focus on past lifetimes, residual lifetimes and mixed lifetimes evaluated at different instants.
This allows to study multicomponent systems, by measuring the dependence in conditional
lifetimes of two components having possibly different ages. We provide some bounds,
and investigate the mutual information of residual lifetimes within the time-transformed
exponential model (under both the assumptions of unbounded and truncated lifetimes).
Moreover, with reference to the order statistics of a random sample, we evaluate explicitly
the mutual information between the minimum and the maximum, conditional on inspection
at different times, and show that it is distribution-free. Finally, we develop a copula-based
approach aiming to express the dynamic mutual information for past and residual bivariate
lifetimes in an alternative way
Age as a risk factor in the occurrence of pneumothorax after transthoracic fine needle biopsy: Our experience
Transthoracic needle biopsy (TTNB) of the lung is a well-established technique for diagnosing many thoracic lesions, and is an important alternative to more invasive surgical procedures. Complications of TTNB include pneumothorax, hemoptysis, hemothorax, infection, and air embolism, with the most common complication as pneumothorax. From June 2011 to June 2014 we performed a prospective study of 188 patients who underwent TTNB with CT guidance at University Hospital of Salerno, Italy. Pneumothorax occurred in 14 of 188 biopsies (7.45%). With the respect of age of patients pneumothorax occurred more frequently in patients aged 60-70 years, while it was less frequent in younger (70 years). In conclusion, data of our prospective study documented that CT-guided TTNB is a safe and reliable procedure in elderly patients with suspected chest malignancy and is well tolerated
On the Telegraph Process Driven by Geometric Counting Process with Poisson-Based Resetting
We investigate the effects of the resetting mechanism to the origin for a random motion on the real line characterized by two alternating velocities v1 and v2 . We assume that the sequences of random times concerning the motions along each velocity follow two independent geometric counting processes of intensity λ , and that the resetting times are Poissonian with rate ξ> 0 . Under these assumptions we obtain the probability laws of the modified telegraph process describing the position and the velocity of the running particle. Our approach is based on the Markov property of the resetting times and on the knowledge of the distribution of the intertimes between consecutive velocity changes. We obtain also the asymptotic distribution of the particle position when (i) λ tends to infinity, and (ii) the time goes to infinity. In the latter case the asymptotic distribution arises properly as an effect of the resetting mechanism. A quite different behavior is observed in the two cases when v2< 0 < v1 and 0 < v2< v1 . Furthermore, we focus on the determination of the moment-generating function and on the main moments of the process describing the particle position under reset. Finally, we analyse the mean-square distance between the process subject to resets and the same process in absence of resets. Quite surprisingly, the lowest mean-square distance can be found for ξ= 0 , for a positive ξ , or for ξ→ + ∞ depending on the choice of the other parameters
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