The selling of put derivatives by firms for shareholder wealth and information signaling enhancement

Working paper; version dated November 5, 200

Surgical strategy for purulent-septic complications of combat abdominal trauma

The incidence of combat abdominal trauma ranges from 6.7 to 9%. The nature of gunshot abdominal wounds leads to the development of functional disorders and complications (51–81%) and, as a result, a high mortality rate (12–31%). The purpose of the work is to improve the effectiveness of surgical treatment of purulent-septic complications in wounded patients with combat abdominal trauma (CAT). We analysed the treatment of 86 wounded patients with purulent-septic complications of CAT who were hospitalized at the Military Medical Clinical Centre of the Southern Region. Taking into account the location, clinical manifestations and severity of the injury, modern methods of treatment were used, namely: puncture-drainage interventions under ultrasound guidance and the NPWT system installation. The complex treatment was supplemented with antibacterial therapy and oxygen barotherapy. First of all, the wounded patients underwent US-guided puncture, drainage interventions and stage debridement for diagnostic and therapeutic purposes. NPWT therapy was used in 11 patients with large wounds and purulent-septic complications of the soft tissues of the anterior abdominal wall. So, the use of interventional ultrasound as a priority diagnostic and therapeutic method for purulent and inflammatory complications of combat abdominal trauma improved the quality of diagnosis and reduced the number of traumatic interventions, which led to a decrease in postoperative complications and the duration of inpatient treatment. 11 (14.2%) cases of puncture-drainage interventions were ineffective, and therefore it was necessary to use traditional methods of treatment — opening and draining purulent-inflammatory foci and using NPWT therapy. Vacuum therapy is an effective method of treating purulent-septic complications of gunshot wounds of the abdominal soft tissues, which, in combination with puncture-drainage interventions, can 2.5 folds reduce the number of recurrent operations (mainly multistage surgical procedures), thereby 1.8 folds reducing the length of hospital stay. The use of current methods has improved the results of surgical treatment of purulent-septic complications in wounded patients with purulent-septic complications of combat abdominal trauma. The use of the current techniques helped to reduce the number of invasive treatment methods, facilitated recovery, reduced bed days, reduced intoxication, and increased the percentage of recovered military personnel

Abolitionism - the first popular civil rights movement in great Britain

The article is devoted to abolitionism in Great Britain at the end of the 18th and the beginning of the 19th century - a movement which aimed to put an end to the infamous slave trade and, eventually, to slavery in general in the country that played a leading role in the transatlantic human traffic at that time. While working out the problem, the author has endeavoured to explain the reasons of emergence of abolitionism, as well as of its success.Статья посвящена аболиционизму в Великобритании в конце XVIII - начале ХІХ века - движению, направленному на ликвидацию позорной работорговли и, в конечном итоге, на полное искоренение рабства в стране, игравшей ведущую роль в трансатлантической торговле людьми в то время. При разработке проблемы автор излагает причины появления аболиционизма, а также причины его успеха

Energy-Aware, Collision-Free Information Gathering for Heterogeneous Robot Teams

This paper considers the problem of safely coordinating a team of sensor-equipped robots to reduce uncertainty about a dynamical process, where the objective trades off information gain and energy cost. Optimizing this trade-off is desirable, but leads to a non-monotone objective function in the set of robot trajectories. Therefore, common multi-robot planners based on coordinate descent lose their performance guarantees. Furthermore, methods that handle non-monotonicity lose their performance guarantees when subject to inter-robot collision avoidance constraints. As it is desirable to retain both the performance guarantee and safety guarantee, this work proposes a hierarchical approach with a distributed planner that uses local search with a worst-case performance guarantees and a decentralized controller based on control barrier functions that ensures safety and encourages timely arrival at sensing locations. Via extensive simulations, hardware-in-the-loop tests and hardware experiments, we demonstrate that the proposed approach achieves a better trade-off between sensing and energy cost than coordinate-descent-based algorithms.Comment: To appear in Transactions on Robotics; 18 pages and 16 figures. arXiv admin note: text overlap with arXiv:2101.1109

Directed current due to broken time-space symmetry

We consider the classical dynamics of a particle in a one-dimensional space-periodic potential U(X) = U(X+2\pi) under the influence of a time-periodic space-homogeneous external field E(t)=E(t+T). If E(t) is neither symmetric function of t nor antisymmetric under time shifts $E(t \pm T/2) \neq -E(t)$, an ensemble of trajectories with zero current at t=0 yields a nonzero finite current as $t\to \infty$. We explain this effect using symmetry considerations and perturbation theory. Finally we add dissipation (friction) and demonstrate that the resulting set of attractors keeps the broken symmetry property in the basins of attraction and leads to directed currents as well.Comment: 2 figure

Probing the N = 32 shell closure below the magic proton number Z = 20: Mass measurements of the exotic isotopes 52,53K

The recently confirmed neutron-shell closure at N = 32 has been investigated for the first time below the magic proton number Z = 20 with mass measurements of the exotic isotopes 52,53K, the latter being the shortest-lived nuclide investigated at the online mass spectrometer ISOLTRAP. The resulting two-neutron separation energies reveal a 3 MeV shell gap at N = 32, slightly lower than for 52Ca, highlighting the doubly-magic nature of this nuclide. Skyrme-Hartree-Fock-Boguliubov and ab initio Gorkov-Green function calculations are challenged by the new measurements but reproduce qualitatively the observed shell effect.Comment: 5 pages, 5 figure