Pion Production Measurement in NA61/SHINE Experiment for High Precision Neutrino Oscillation Experiments

One of physics goals of the NA61/SHINE experiment is a measurement of hadron production cross sections from proton-Carbon interactions at 31GeV/c for the T2K experiment at J-PARC. A precise knowledge of differential cross sections for pion and kaon production is of importance for improving the accuracy of neutrino flux simulations. The NA61 detector has a large angular acceptance, full coverage of the T2K phase space region, and good particle identification. In this work the analyses of negatively charged pion production are presented. Two different methods of negative pion selection and corrections for detector effects are discussed. Finally, preliminary dn/dp distributions of negatively charged pion in p+C interactions at 31 GeV/c are presented.Comment: Proccedings from poster presented at the 2009 Europhysics Conference on High Energy Physics, 16-22 July 2009 Krakow, Polan

Growth-optimal portfolios under transaction costs

This paper studies a portfolio optimization problem in a discrete-time Markovian model of a financial market, in which asset price dynamics depend on an external process of economic factors. There are transaction costs with a structure that covers, in particular, the case of fixed plus proportional costs. We prove that there exists a self-financing trading strategy maximizing the average growth rate of the portfolio wealth. We show that this strategy has a Markovian form. Our result is obtained by large deviations estimates on empirical measures of the price process and by a generalization of the vanishing discount method to discontinuous transition operators.Comment: 32 page

Impulse control maximising average cost per unit time: a non-uniformly ergodic case

This paper studies maximisation of an average-cost-per-unit-time ergodic functional over impulse strategies controlling a Feller-Markov process. The uncontrolled process is assumed to be ergodic but, unlike the extant literature, the convergence to invariant measure does not have to be uniformly geometric in total variation norm; in particular, we allow for non-uniform geometric or polynomial convergence. Cost of an impulse may be unbounded, e.g., proportional to the distance the process is shifted. We show that the optimal value does not depend on the initial state and provide optimal or \ve-optimal strategies.Comment: 25 pages; This is an updated version after spinning off two sections of the paper as a basis for arxiv:1607.0601

Osteoblastoma of the femur in a patient with recurrent paronychia : case report

Background: Osteoblastoma is a rare primary benign bone tumor that has varied radiologic presentation depending on the affected site. In selected cases, differential diagnosis with subacute osteomyelitis is necessary. Case Report: The authors present the case of a 23 year-old male with recurrent paronychia diagnosed with osteoblastoma of the femur. On the basis of CT and MRI findings, osteosarcoma, ABC, enchondroma, chondromyxoid fibroma, and Brodie's abscess were excluded from differential diagnosis, with the last option being the second most probable diagnosis given the coexistence of chronic pyogenic process. Discussion: Plain film findings in osteoblastoma and Brodie's abscess may be strikingly similar with an osteolytic lesion surrounded by prominent sclerosis. The nature of the lesion can be further elucidated by cross-sectional imaging. CT helps to assess the lesion matrix and presence or absence of sequestra or fistulae, while MRI defines the extent of the changes in bone marrow cavity and soft tissues

Exit game with private information

The timing of strategic exit is one of the most important but difficult business decisions, especially under competition and uncertainty. Motivated by this problem, we examine a stochastic game of exit in which players are uncertain about their competitor's exit value. We construct an equilibrium for a large class of payoff flows driven by a general one-dimensional diffusion. In the equilibrium, the players employ sophisticated exit strategies involving both the state variable and the posterior belief process. These strategies are specified explicitly in terms of the problem data and a solution to an auxiliary optimal stopping problem. The equilibrium we obtain is further shown to be unique within a wide subclass of symmetric perfect Bayesian equilibria.Comment: 32 page

Is whole-body trauma MDCT justified in patients in good clinical condition but with dangerous trauma mechanism?

Background: To assess whether whole body MDCT is justified in patients in good clinical condition yet with dangerous trauma mechanism. Material/Methods: The study included 81 patients who were examined between January and July 2008 with wholebody trauma CT protocol. Inclusion into the study was based on a dangerous trauma mechanism and the possibility of an unbiased calculation of the weighted revised trauma score (RTSw). All examinations were performed with 16 row MDCT scanner located in emergency department. The cut off of the RTSw over 6.0 was used to separate the patients in good clinical condition. The CT examinations and medical records of patients were reviewed to assess the number of significant injuries, the need for emergency surgery and other types of medical treatment, the number of negative CT examinations, the number of patients admitted to hospital, and mortality. Results: 28 life-threatening injuries were found in 21 of 61 patients with RTS over 6.0 (34.4%). Only two of those patients required emergency surgery (laparotomy). CT studies were negative for traumatic injuries in 22 patients from this group (36.0%). Conclusions: Whole-body MDCT may detect injuries in patients in good clinical condition, with some of them demanding medical treatment. Still, further studies are required to balance the advantages of MDCT and potentially harmful effects of radiation dose, especially better triage systems and lowdose protocols are needed