Measurement of direct photon emission in K+→π+π0γK^+ \to \pi^+ \pi^0 \gamma decay using stopped positive kaons

The radiative decay $K^+ \to \pi^+ \pi^0 \gamma$ ($K_{\pi 2 \gamma}$) has been measured with stopped positive kaons. A $K_{\pi 2 \gamma}$ sample containing 4k events was analyzed, and the $K_{\pi 2 \gamma}$ branching ratio of the direct photon emission process was determined to be $[6.1\pm2.5({\rm stat})\pm1.9({\rm syst})]\times 10^{-6}$. No interference pattern with internal bremsstrahlung was observed.Comment: 12 pages, 6 figures, 2 tables, to be published in Phys. Lett.

Measurement of K^+ \to \pi^0 \mu^+ \nu \gamma decay using stopped kaons

The K^+ \to \pi^0 \mu^+ \nu \gamma ($K_{\mu 3 \gamma}$) decay has been measured with stopped positive kaons at the KEK 12 GeV proton synchrotron. A $K_{\mu 3 \gamma}$ sample containing 125 events was obtained. The partial branching ratio $Br(K_{\mu 3 \gamma}, E_{\gamma}>30 {\rm MeV}, \theta_{\mu^+ \gamma}>20^{\circ})$ was found to be $[2.4 \pm 0.5(stat) \pm 0.6(syst)]\times 10^{-5}$, which is in good agreement with theoretical predictions.Comment: 12 pages, 3 figures, to be published in Physics Letters

Apparatus for a Search for T-violating Muon Polarization in Stopped-Kaon Decays

The detector built at KEK to search for T-violating transverse muon polarization in K+ --> pi0 mu+ nu (Kmu3) decay of stopped kaons is described. Sensitivity to the transverse polarization component is obtained from reconstruction of the decay plane by tracking the mu+ through a toroidal spectrometer and detecting the pi0 in a segmented CsI(Tl) photon calorimeter. The muon polarization was obtained from the decay positron asymmetry of muons stopped in a polarimeter. The detector included features which minimized systematic errors while maintaining high acceptance.Comment: 56 pages, 30 figures, submitted to NI

Measurement of Γ(Kμ3)/Γ(Ke3)\Gamma(K_{\mu 3})/\Gamma(K_{e3}) ratio using stopped positive kaons

The ratio of the $K^{+}\to \pi^{0} \mu^{+} \nu$ ($K_{\mu3}^+$) and $K^{+}\to \pi^{0} e^{+} \nu$ ($K_{e3}^+$) decay widths, $\Gamma(K_{\mu 3})/\Gamma(K_{e3})$, has been measured with stopped positive kaons. $K_{\mu3}^+$ and $K_{e3}^+$ samples containing 2.4$\times 10^4$ and 4.0$\times 10^4$ events, respectively, were analyzed. The $\Gamma(K_{\mu3})/\Gamma(K_{e3})$ ratio was obtained to be 0.671$\pm$0.007(stat.)$\pm$0.008(syst.) calculating the detector acceptance by a Monte Carlo simulation with the assumption of $\mu$-$e$ universality in $K_{l3}^+$ decay. The coefficient of the $q^2$ dependent term of the $f_0$ form factor was also determined to be $\lambda_0$=0.022$\pm$0.005(stat.)$\pm$0.004(syst.).Comment: 12 pages, 6 figure

A new SPS programme

A new experiemntal program to study hadron production in hadron-nucleus and nucleus-nucleus collisions at the CERN SPS has been recently proposed by the NA49-future collaboration. The physics goals of the program are: (i) search for the critical point of strongly interacting matter and a study of the properties of the onset of deconfinemnt in nucleus-nucleus collisions, (ii) measurements of correlations, fluctuations and hadron spectra at high transverse momentum in proton-nucleus collisions needed as for better understanding of nucleus-nucleus results, (iii) measurements of hadron production in hadron-nucleus interactions needed for neutrino (T2K) and cosmic-ray (Pierre Auger Observatory and KASCADE) expriments. The physics of the nucleus-nucleus program is reviewed in this presentation

Search for the QCD critical point at SPS energies

Lattice QCD calculations locate the QCD critical point at energies accessible at the CERN Super Proton Synchrotron (SPS). We present average transverse momentum and multiplicity fluctuations, as well as baryon and anti-baryon transverse mass spectra which are expected to be sensitive to effects of the critical point. The future CP search strategy of the NA61/SHINE experiment at the SPS is also discussed.Lattice QCD calculations locate the QCD critical point at energies accessible at the CERN Super Proton Synchrotron (SPS). We present average transverse momentum and multiplicity fluctuations, as well as baryon and anti-baryon transverse mass spectra which are expected to be sensitive to effects of the critical point. The future CP search strategy of the NA61/SHINE experiment at the SPS is also discussed

论创业投资中的风险控制

创业投资是资本市场培育高新技术产业的一种创新的制度安排，有别于一般的投资活动。由于被投资企业的不确定性、交易中信息的高度不对称及投资参与方以外的因素，使得创业投资在获得高收益回报的同时，要承担比一般投资活动大得多的风险，高风险是其核心特征。对风险的有效控制成为创业投资成功获得预期收益的关键。在我国目前这种环境下，由于经济体制和市场机制的缺陷，创业投资蕴含的风险更大，更有必要强调风险控制。全文共分三章，主要内容如下： 第一章比较创业投资与一般投资的主要区别，阐明创业投资风险的特殊性和风险控制的重点。 第二章这是文章的重点，针对创业投资的三个风险来源：被投资企业的不确定性、交易中信息的高度不对...学位：经济学硕士院系专业：经济学院经济系_政治经济学学号：19980900

Features of surgical treatment of posttraumatic lower limbs of different lengths in adult patients

Relevance Different lengths of the lower extremities have a negative impact on the position of the pelvis and spine and lead to secondary deformities. To prevent these consequences, early surgical correction of the shortening is necessary. Aim of study Study of the features of post-traumatic shortening of the lower extremities, mechanisms of adaptation to this condition and, on the basis of this, optimization of surgical technique when performing reconstructive and restorative operations. Material and methods A total of 276 patients with posttraumatic shortening of the lower extremities were examined, 102 of whom were operated on. Comparative radiography of both legs was used to diagnose different lengths. The Ilizarov method was used as the main method of surgical correction. Results We studied the mechanisms of adaptation of patients to post-traumatic shortening of the hip and lower leg and optimized surgical technique. A method was developed for determining the optimal elongation value. Conclusion The most effective and least traumatic method is external osteosynthesis according to Ilizarov. Distraction in the apparatus allows the formation of a regenerate of the required shape and length and the elongation of exactly the amount that is optimal for a given patient. © 2020 Sklifosovsky Research Institute for Emergency Medicine. All rights reserved

Osteosynthesis according to ilizarov as a self-sufficient method for treatment of shin bones fractures [ОСТЕОСИНТЕЗ ПО ИЛИЗАРОВУ КАК САМОДОСТАТОЧНЫЙ МЕТОД ЛЕЧЕНИЯ ПЕРЕЛОМОВ КОСТЕЙ ГОЛЕНИ]

Shin fractures are the most common skeletal injuries. Practically all known types of osteosynthesis are used for treatment. The use of the Ilizarov method is associated with certain difficulties relating to the peculiarities of postoperative observation. Objective − to generalize the long-term experience of using the Ilizarov method in the treatment of diaphyseal fractures of the shin bones, to optimize the technique, analyze problems and assess the prospects for the development of the method. Materials and methods. The experience with treating 57 patients with diaphyseal fractures of the shin bones is presented. All patients underwent Ilizarov osteosynthesis using rod and spoke-rod devices. The dynamics of load recovery, the timing of dismantling the apparatus, the number and severity of complications were assessed. Results. The recovery times for the loads were as follows: 25 % − 5.4 + 1.4 days; 50 % − 34.7 + 11.2 days; 100 % − 76.2 + 17.6 days. The time for dismantling the apparatus is 155 + 37.3 days. The minimum period from osteosynthesis to the dismantling of the apparatus was 95 days, the maximum – 278 days. During the treatment of the group of patients under consideration, two types of complications were encountered: inflammation of the soft tissues at the points of exit of the wires in 24 (42.1 %) and delayed fusion in 1 (1.8 %) patient. Conclusion. The use of spoke-rod structures is optimal. The osteosynthesis operation involves performing a preliminary reduction. A feature of the postoperative period is constant monitoring and interaction between the doctor and the patient. Osteosynthesis according to Ilizarov in the treatment of patients with fractures of the shin bones is a self-sufficient method that provides accurate reposition, stable fixation and good anatomical and functional results. © 2021 The Charity Fund of Clinical Center of Miners' Health Protection. All rights reserved