Classical Trajectories for two Ring-Shaped Potentials

This paper deals with the classical trajectories for two super-integrable systems: a system known in quantum chemistry as the Hartmann system and a system of potential use in quantum chemistry and nuclear physics. Both systems correspond to ring-shaped potentials. They admit two maximally super-integrable systems as limiting cases, viz, the isotropic harmonic oscillator system and the Coulomb-Kepler system in three dimensions. The planarity of the trajectories is studied in a systematic way. In general, the trajectories are quasi-periodic rather than periodic. A constraint condition allows to pass from quasi-periodic motions to periodic ones. When written in a quantum mechanical context, this constraint condition leads to new accidental degeneracies for the two systems studied.Comment: 28 pages, Tex fil

Utilization of mechanical power and associations with clinical outcomes in brain injured patients. a secondary analysis of the extubation strategies in neuro-intensive care unit patients and associations with outcome (ENIO) trial

BackgroundThere is insufficient evidence to guide ventilatory targets in acute brain injury (ABI). Recent studies have shown associations between mechanical power (MP) and mortality in critical care populations. We aimed to describe MP in ventilated patients with ABI, and evaluate associations between MP and clinical outcomes.MethodsIn this preplanned, secondary analysis of a prospective, multi-center, observational cohort study (ENIO, NCT03400904), we included adult patients with ABI (Glasgow Coma Scale <= 12 before intubation) who required mechanical ventilation (MV) >= 24 h. Using multivariable log binomial regressions, we separately assessed associations between MP on hospital day (HD)1, HD3, HD7 and clinical outcomes: hospital mortality, need for reintubation, tracheostomy placement, and development of acute respiratory distress syndrome (ARDS).ResultsWe included 1217 patients (mean age 51.2 years [SD 18.1], 66% male, mean body mass index [BMI] 26.3 [SD 5.18]) hospitalized at 62 intensive care units in 18 countries. Hospital mortality was 11% (n = 139), 44% (n = 536) were extubated by HD7 of which 20% (107/536) required reintubation, 28% (n = 340) underwent tracheostomy placement, and 9% (n = 114) developed ARDS. The median MP on HD1, HD3, and HD7 was 11.9 J/min [IQR 9.2-15.1], 13 J/min [IQR 10-17], and 14 J/min [IQR 11-20], respectively. MP was overall higher in patients with ARDS, especially those with higher ARDS severity. After controlling for same-day pressure of arterial oxygen/fraction of inspired oxygen (P/F ratio), BMI, and neurological severity, MP at HD1, HD3, and HD7 was independently associated with hospital mortality, reintubation and tracheostomy placement. The adjusted relative risk (aRR) was greater at higher MP, and strongest for: mortality on HD1 (compared to the HD1 median MP 11.9 J/min, aRR at 17 J/min was 1.22, 95% CI 1.14-1.30) and HD3 (1.38, 95% CI 1.23-1.53), reintubation on HD1 (1.64; 95% CI 1.57-1.72), and tracheostomy on HD7 (1.53; 95%CI 1.18-1.99). MP was associated with the development of moderate-severe ARDS on HD1 (2.07; 95% CI 1.56-2.78) and HD3 (1.76; 95% CI 1.41-2.22).ConclusionsExposure to high MP during the first week of MV is associated with poor clinical outcomes in ABI, independent of P/F ratio and neurological severity. Potential benefits of optimizing ventilator settings to limit MP warrant further investigation

Three-body calculation of π\pi d elastic scattering at 142 MeV

Abstract To what extent does the medium, that is to say inscription way and also the dynamics of " reading ", play a significative role to regards the context it takes on in the process of advertising aesthetic behaviours ? Here is the question raised repeatealy in the debate and statements about the theme of digital arts. The characteristics of this new vector, imperative logic, bivalent algebra, langage, electronic flux, affect the arts and stimulate the emergency of new ones. But this influence occurs in the area of meaning and therefore we have to start investigating again first into the meaning of traditional techniques affected by the mutation so as to undestand the compatibility of the format of existing arts is with that of digital art as a medium and as an original form of art. A few assomptions concerning visual arts will be found in this article, where hypothesis of the cognitive impact of art is taken from previous texts and dealt with the light of new facts. A criticism of digital arts reveals the tremendous complexity prevailing in this domain. From the simulation of traditional techniques to the ethical consequences of a bio-symbolical " iconosphère " made real thanks to exhibition, crossing the phenomenal dressing of idealities of the sensitive structure, we are far from reading there the simple theoretical solutions suggested by the software ideology and the supposedly naive denominational binarism

Relativistic description of π\pi D elastic scattering in the (33) resonance region

We are interested in the organisational changes in identity, brought about by the juxtaposition of paper and electronic media in the domain of daily newspapers. We define these changes through a specific case: placing the daily newspaper Le Monde on the Internet as Web pages. Our concern is how changes in identity, related to placing a daily newspaper on-line, are understood by a “communicational reading”. We explore the on-line newspaper industry using “l'approche communicationnelle” (Alex Mucchielli, 1997, 1998, 2000). This approach pays particular attention to the communication processes which define the on-line newspaper industry. Our objective is to research how the nature of journalism arises, sets itself up and evolves with the help of information and communication technologies