Electron cyclotron resonance near the axis of the gas-dynamic trap

Propagation of an extraordinary electromagnetic wave in the vicinity of electron cyclotron resonance surface in an open linear trap is studied analytically, taking into account inhomogeneity of the magnetic field in paraxial approximation. Ray trajectories are derived from a reduced dispersion equation that makes it possible to avoid the difficulty associated with a transition from large propagation angles to the case of strictly longitudinal propagation. Our approach is based on the theory, originally developed by the Zvonkov and Timofeev [1], who used the paraxial approximation for the magnetic field strength, but did not consider the slope of the magnetic field lines, which led to considerable error, as has been recently noted by Gospodchikov and Smolyakova [2]. We have found ray trajectories in analytic form and demonstrated that the inhomogeneity of both the magnetic field strength and the field direction can qualitatively change the picture of wave propagation and significantly affect the efficiency of electron cyclotron heating of a plasma in a linear magnetic trap. Analysis of the ray trajectories has revealed a criterion for the resonance point on the axis of the trap to be an attractor for the ray trajectories. It is also shown that a family of ray trajectories can still reach the resonance point on the axis if the latter generally repels the ray trajectories. As an example, results of general theory are applied to the electron cyclotron resonance heating experiment which is under preparation on the Gas Dynamic Trap in the Budker Institute of Nuclear Physics [3]

Postoperative prolonged infiltration anesthesia for multimodal perioperative pain management in patients with hip replacement arthroplasty

ТАЗОБЕДРЕННЫЙ СУСТАВ /ХИРТОТАЛЬНОЕ ЭНДОПРОТЕЗИРОВАНИЕАНЕСТЕЗИЯ ЭПИДУРАЛЬНАЯАНЕСТЕЗИЯ МЕСТНАЯАНЕСТЕЗИЯ ИНФИЛЬТРАЦИОННАЯРОПИВАКАИНА ГИДРОХЛОРИДМИКРОИНФУЗИОННАЯ ПОМПАЦель. Улучшить эффективность мультимодального периоперационного обезболивания у пациентов при тотальном эндопротезировании тазобедренного сустава за счет применения послеоперационной пролонгированной инфильтрационной анестезии области оперативного вмешательства. Материал и методы. Проведен проспективный сравнительный анализ результатов лечения 78 пациентов, которым было выполнено первичное тотальное эндопротезирование тазобедренного сустава. Пациенты были разделены на две группы: в первой группе в послеоперационном периоде использовали продленную эпидуральную анальгезию, во второй группе применяли пролонгированную 24-часовую инфильтрационную анестезию области операции введением 0,2% раствора ропивакаина гидрохлорида с помощью микроинфузионной помпы с постоянной скоростью 8 мл/час. У всех пациентов анализировали выраженность болевого синдрома, уровень плазменной концентрации кортизола, уровень гликемии. Также оценивали расход тримеперидина и время начала активизации пациентов. Оценку проводили за 24 часа до операции, а также через 6 и 24 часа после нее. Результаты. Через 24 часа после операции в первой и второй группах выраженность боли по шкале ВАШ составила 2,2±0,35 и 1,5±0,42 балла соответственно; уровень плазменного кортизола составил 768,5±45,8 нмоль/л и 584,6±54,2 нмоль/л соответственно; уровень концентрации глюкозы в крови составил 7,03±0,34 ммоль/л и 5,91±0,27 ммоль/л соответственно. Количество использованного тримеперидина за первые 24 часа после операции в первой и второй группах составило 38,6±2,95 мг и 21,3±3,17 мг соответственно. Первое присаживание и вертикализацию пациентов в первой группе осуществляли через 24,8±2,4 и 28±1,4 часа, во второй клинической группе – через 4,5±0,5 и 6,3±0,7 часа соответственно. Заключение. Применение пролонгированной инфильтрационной анестезии позволило на 46,7% эффективнее купировать болевой синдром, на 55,2% снизить количество требуемого тримеперидина в течение первых суток после операции и на 20,3±1,4 часа раньше начать активизацию пациентов по сравнению с продленной эпидуральной анестезией.Objective. To improve the efficiency of multimodal perioperative pain management in patients in case of the hip replacement arthroplasty using postoperative prolonged infiltration anesthesia in the area of surgical intervention. Methods. A prospective comparative analysis of the treatment results of 78 patients underwent the primary hip replacement arthroplasty was performed. The patients were divided into two groups: (1) the first group of patients was treated with prolonged epidural analgesia in the postoperative period, while (2) in the second group, the patients were treated with prolonged 24-hour infiltration anesthesia at the area of the surgical intervention by 0.2% of the ropivacaine hydrochloride solution, administered using microinfusion pump with a constant rate of 8 ml per hour. All patients were assessed for intensity of the pain syndrome, plasma concentrations of the cortisol and blood glucose levels. Also, trimeperidine consumption rate and the start of patient’s activity were assessed. The evaluation was conducted 24 hours prior to the surgical intervention, as well as 6 and 24 hours after. Results. 24 hours after the surgery, the pain intensity scores assessed by the VAS were 2.2±0.35 and 1.5±0.42 points in the first and second clinical groups, respectively; the cortisol plasma levels 24 hours after the surgical intervention were 768.5±45.8 nmol/l and 584.6±54.2 nmol/l in the first and second clinical groups, respectively; the blood glucose levels after the surgical intervention were 7.03±0.34 mmol/l and 5.91±0.27 mmol/l in the first and second clinical groups, respectively. Trimeperidine consumption rates for the first 24 hours after the surgical intervention were 38.6±2.95 mg and 21.3±3.17 mg in the first and second clinical groups, respectively. The first sitting and complete verticalization of patients in the first group were performed in 24.8±2.4 and 28±1.4 hours, while in the second clinical group, these activities were performed in 4.5±0.5 and 6.3±0.7 hours respectively. Conclusions. The use of the prolonged infiltration anesthesia allowed by 46.7% more effectively arresting pain syndrome, by 55.2% reducing trimeperidine consumption rate for the first 24 hours after the surgical intervention and by 20.3±1.4 hours earlier starting activation of patients if compared to the prolonged epidural analgesia

Optimization of surgical treatment of children with plano-valgus feet deformation by applying a combination of subtalar arthrorisis and the author's technique of the muscle-tendon plasty

Plano-valgus deformation foot in children is up to 70% of the entire pathology of orthopedic nature. More than 50% of them note certain secondary deformities of the knee, hip joints and spinal deformities. The aim of this study is to improve the results of surgical treatment of children with flat-valgus deformity of the feet by the use of rammed arthroeresis in combination with the author's technique of tendon-muscle plasty[4]. For the period 2016-2018 this method performed 70 operations, age from 4 to 11 years, including 33 girls. In 63 operations were performed on two feet, in 7 on one foot. 57 patients had a good result, namely the elimination of deformation, reduction or complete disappearance of pain in the feet and ankle joints, increasing the duration of physical activity. The negative results of migration of the implant in 3 children. The data obtained require further analysis and observation.Плоско-вальгусная деформация стоп у детей составляет до 70% из всей патологии ортопедического характера. Более 50% из них отмечают те или иные вторичные деформации коленных, тазобедренных суставов и деформации позвоночника. Целью данного исследования является улучшение результатов хирургического лечения детей с плоско-вальгусной деформацией стоп путем применения подтаранного артроэреза в комбинации с авторской методикой сухожильно-мышечной пластики[4]. За период 2016-2018 год данным методом выполнено 70 операций, возраст от 4 до 11 лет, из них 33 девочки. У 63 операции проводились на двух стопах, у 7 на одной стопе. У 57 пациентов отмечался хороший результат, а именно устранение деформации, уменьшение или полное исчезновение болей в стопах и голеностопных суставах, увеличение продолжительности физической активности. Отрицательные результаты – миграция импланта у 3 детей. Полученные данные требуют дальнейшего анализа и наблюдения

The H1 Forward Proton Spectrometer at HERA

The forward proton spectrometer is part of the H1 detector at the HERA collider. Protons with energies above 500 GeV and polar angles below 1 mrad can be detected by this spectrometer. The main detector components are scintillating fiber detectors read out by position-sensitive photo-multipliers. These detectors are housed in so-called Roman Pots which allow them to be moved close to the circulating proton beam. Four Roman Pot stations are located at distances between 60 m and 90 m from the interaction point.Comment: 20 pages, 10 figures, submitted to Nucl.Instr.and Method

Application of arthroscopy of the knee joint in children

this article touches upon the question of possibility and expediency of application of arthroscopic technologies in surgical treatment of knee joint pathology. The statistical data of treatment of patients on the basis of children's traumatological and orthopedic Department of Clinics are given. On the basis of statistical analysis of clinical examples we conclude about the positive aspects of the use of arthroscopic techniques in pediatric orthopedic practice.В данной статье затрагивается вопрос возможности и целесообразности применения артроскопических технологий при оперативном лечении патологии коленного сустава. Приводятся статистические данные лечения пациентов на базе детского травматолого-ортопедического отделения Клиник СамГМУ. На основания статистического анализа клинических примеров делаем вывод о положительных моментах применения артроскопической методики в детской ортопедической практике

Application of arthroscopy of the knee joint in children

This article touches upon the question of possibility and expediency of application of arthroscopic technologies in surgical treatment of knee joint pathology. The statistical data of treatment of patients on the basis of children's traumatological and orthopedic Department of Clinics are given. On the basis of statistical analysis of clinical examples we conclude about the positive aspects of the use of arthroscopic techniques in pediatric orthopedic practice.В данной статье затрагивается вопрос возможности и целесообразности применения артроскопических технологий при оперативном лечении патологии коленного сустава. Приводятся статистические данные лечения пациентов на базе детского травматолого-ортопедического отделения Клиник СамГМУ. На основания статистического анализа клинических примеров делаем вывод о положительных моментах применения артроскопической методики в детской ортопедической практике

A Study of Muon Neutrino Disappearance Using the Fermilab Main Injector Neutrino Beam

We report the results of a search for muon-neutrino disappearance by the Main Injector Neutrino Oscillation Search. The experiment uses two detectors separated by 734 km to observe a beam of neutrinos created by the Neutrinos at the Main Injector facility at Fermi National Accelerator Laboratory. The data were collected in the first 282 days of beam operations and correspond to an exposure of 1.27e20 protons on target. Based on measurements in the Near Detector, in the absence of neutrino oscillations we expected 336 +/- 14 muon-neutrino charged-current interactions at the Far Detector but observed 215. This deficit of events corresponds to a significance of 5.2 standard deviations. The deficit is energy dependent and is consistent with two-flavor neutrino oscillations according to delta m-squared = 2.74e-3 +0.44/-0.26e-3 eV^2 and sin^2(2 theta) > 0.87 at 68% confidence level.Comment: In submission to Phys. Rev.

Smart manufacturing of complex shaped pipe components

Manufacturing industry is constantly improving. Nowadays the most relevant trend is widespread automation and optimization of the production process. This paper represents a novel approach for smart manufacturing of steel pipe valves. The system includes two main parts: mechanical treatment and quality assurance units. Mechanical treatment is performed by application of the milling machine with implementation of computerized numerical control, whilst the quality assurance unit contains three testing modules for different tasks, such as Xray testing, optical scanning and ultrasound testing modules. The advances of each of them provide reliable results that contain information about any failures of the technological process, any deviations of geometrical parameters of the valves. The system also allows detecting defects on the surface or in the inner structure of the component